Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

1 files changed, 3307 insertions, 0 deletions

diff --git a/vendor/object/src/macho.rs b/vendor/object/src/macho.rs
new file mode 100644
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+//! Mach-O definitions.
+//!
+//! These definitions are independent of read/write support, although we do implement
+//! some traits useful for those.
+//!
+//! This module is based heavily on header files from MacOSX11.1.sdk.
+
+#![allow(missing_docs)]
+
+use crate::endian::{BigEndian, Endian, U64Bytes, U16, U32, U64};
+use crate::pod::Pod;
+
+// Definitions from "/usr/include/mach/machine.h".
+
+/*
+ * Capability bits used in the definition of cpu_type.
+ */
+
+/// mask for architecture bits
+pub const CPU_ARCH_MASK: u32 = 0xff00_0000;
+/// 64 bit ABI
+pub const CPU_ARCH_ABI64: u32 = 0x0100_0000;
+/// ABI for 64-bit hardware with 32-bit types; LP32
+pub const CPU_ARCH_ABI64_32: u32 = 0x0200_0000;
+
+/*
+ *	Machine types known by all.
+ */
+
+pub const CPU_TYPE_ANY: u32 = !0;
+
+pub const CPU_TYPE_VAX: u32 = 1;
+pub const CPU_TYPE_MC680X0: u32 = 6;
+pub const CPU_TYPE_X86: u32 = 7;
+pub const CPU_TYPE_X86_64: u32 = CPU_TYPE_X86 | CPU_ARCH_ABI64;
+pub const CPU_TYPE_MIPS: u32 = 8;
+pub const CPU_TYPE_MC98000: u32 = 10;
+pub const CPU_TYPE_HPPA: u32 = 11;
+pub const CPU_TYPE_ARM: u32 = 12;
+pub const CPU_TYPE_ARM64: u32 = CPU_TYPE_ARM | CPU_ARCH_ABI64;
+pub const CPU_TYPE_ARM64_32: u32 = CPU_TYPE_ARM | CPU_ARCH_ABI64_32;
+pub const CPU_TYPE_MC88000: u32 = 13;
+pub const CPU_TYPE_SPARC: u32 = 14;
+pub const CPU_TYPE_I860: u32 = 15;
+pub const CPU_TYPE_ALPHA: u32 = 16;
+pub const CPU_TYPE_POWERPC: u32 = 18;
+pub const CPU_TYPE_POWERPC64: u32 = CPU_TYPE_POWERPC | CPU_ARCH_ABI64;
+
+/*
+ * Capability bits used in the definition of cpu_subtype.
+ */
+/// mask for feature flags
+pub const CPU_SUBTYPE_MASK: u32 = 0xff00_0000;
+/// 64 bit libraries
+pub const CPU_SUBTYPE_LIB64: u32 = 0x8000_0000;
+/// pointer authentication with versioned ABI
+pub const CPU_SUBTYPE_PTRAUTH_ABI: u32 = 0x8000_0000;
+
+/// When selecting a slice, ANY will pick the slice with the best
+/// grading for the selected cpu_type_t, unlike the "ALL" subtypes,
+/// which are the slices that can run on any hardware for that cpu type.
+pub const CPU_SUBTYPE_ANY: u32 = !0;
+
+/*
+ *	Object files that are hand-crafted to run on any
+ *	implementation of an architecture are tagged with
+ *	CPU_SUBTYPE_MULTIPLE.  This functions essentially the same as
+ *	the "ALL" subtype of an architecture except that it allows us
+ *	to easily find object files that may need to be modified
+ *	whenever a new implementation of an architecture comes out.
+ *
+ *	It is the responsibility of the implementor to make sure the
+ *	software handles unsupported implementations elegantly.
+ */
+pub const CPU_SUBTYPE_MULTIPLE: u32 = !0;
+pub const CPU_SUBTYPE_LITTLE_ENDIAN: u32 = 0;
+pub const CPU_SUBTYPE_BIG_ENDIAN: u32 = 1;
+
+/*
+ *	VAX subtypes (these do *not* necessary conform to the actual cpu
+ *	ID assigned by DEC available via the SID register).
+ */
+
+pub const CPU_SUBTYPE_VAX_ALL: u32 = 0;
+pub const CPU_SUBTYPE_VAX780: u32 = 1;
+pub const CPU_SUBTYPE_VAX785: u32 = 2;
+pub const CPU_SUBTYPE_VAX750: u32 = 3;
+pub const CPU_SUBTYPE_VAX730: u32 = 4;
+pub const CPU_SUBTYPE_UVAXI: u32 = 5;
+pub const CPU_SUBTYPE_UVAXII: u32 = 6;
+pub const CPU_SUBTYPE_VAX8200: u32 = 7;
+pub const CPU_SUBTYPE_VAX8500: u32 = 8;
+pub const CPU_SUBTYPE_VAX8600: u32 = 9;
+pub const CPU_SUBTYPE_VAX8650: u32 = 10;
+pub const CPU_SUBTYPE_VAX8800: u32 = 11;
+pub const CPU_SUBTYPE_UVAXIII: u32 = 12;
+
+/*
+ *      680x0 subtypes
+ *
+ * The subtype definitions here are unusual for historical reasons.
+ * NeXT used to consider 68030 code as generic 68000 code.  For
+ * backwards compatibility:
+ *
+ *	CPU_SUBTYPE_MC68030 symbol has been preserved for source code
+ *	compatibility.
+ *
+ *	CPU_SUBTYPE_MC680x0_ALL has been defined to be the same
+ *	subtype as CPU_SUBTYPE_MC68030 for binary comatability.
+ *
+ *	CPU_SUBTYPE_MC68030_ONLY has been added to allow new object
+ *	files to be tagged as containing 68030-specific instructions.
+ */
+
+pub const CPU_SUBTYPE_MC680X0_ALL: u32 = 1;
+// compat
+pub const CPU_SUBTYPE_MC68030: u32 = 1;
+pub const CPU_SUBTYPE_MC68040: u32 = 2;
+pub const CPU_SUBTYPE_MC68030_ONLY: u32 = 3;
+
+/*
+ *	I386 subtypes
+ */
+
+#[inline]
+pub const fn cpu_subtype_intel(f: u32, m: u32) -> u32 {
+    f + (m << 4)
+}
+
+pub const CPU_SUBTYPE_I386_ALL: u32 = cpu_subtype_intel(3, 0);
+pub const CPU_SUBTYPE_386: u32 = cpu_subtype_intel(3, 0);
+pub const CPU_SUBTYPE_486: u32 = cpu_subtype_intel(4, 0);
+pub const CPU_SUBTYPE_486SX: u32 = cpu_subtype_intel(4, 8);
+pub const CPU_SUBTYPE_586: u32 = cpu_subtype_intel(5, 0);
+pub const CPU_SUBTYPE_PENT: u32 = cpu_subtype_intel(5, 0);
+pub const CPU_SUBTYPE_PENTPRO: u32 = cpu_subtype_intel(6, 1);
+pub const CPU_SUBTYPE_PENTII_M3: u32 = cpu_subtype_intel(6, 3);
+pub const CPU_SUBTYPE_PENTII_M5: u32 = cpu_subtype_intel(6, 5);
+pub const CPU_SUBTYPE_CELERON: u32 = cpu_subtype_intel(7, 6);
+pub const CPU_SUBTYPE_CELERON_MOBILE: u32 = cpu_subtype_intel(7, 7);
+pub const CPU_SUBTYPE_PENTIUM_3: u32 = cpu_subtype_intel(8, 0);
+pub const CPU_SUBTYPE_PENTIUM_3_M: u32 = cpu_subtype_intel(8, 1);
+pub const CPU_SUBTYPE_PENTIUM_3_XEON: u32 = cpu_subtype_intel(8, 2);
+pub const CPU_SUBTYPE_PENTIUM_M: u32 = cpu_subtype_intel(9, 0);
+pub const CPU_SUBTYPE_PENTIUM_4: u32 = cpu_subtype_intel(10, 0);
+pub const CPU_SUBTYPE_PENTIUM_4_M: u32 = cpu_subtype_intel(10, 1);
+pub const CPU_SUBTYPE_ITANIUM: u32 = cpu_subtype_intel(11, 0);
+pub const CPU_SUBTYPE_ITANIUM_2: u32 = cpu_subtype_intel(11, 1);
+pub const CPU_SUBTYPE_XEON: u32 = cpu_subtype_intel(12, 0);
+pub const CPU_SUBTYPE_XEON_MP: u32 = cpu_subtype_intel(12, 1);
+
+#[inline]
+pub const fn cpu_subtype_intel_family(x: u32) -> u32 {
+    x & 15
+}
+pub const CPU_SUBTYPE_INTEL_FAMILY_MAX: u32 = 15;
+
+#[inline]
+pub const fn cpu_subtype_intel_model(x: u32) -> u32 {
+    x >> 4
+}
+pub const CPU_SUBTYPE_INTEL_MODEL_ALL: u32 = 0;
+
+/*
+ *	X86 subtypes.
+ */
+
+pub const CPU_SUBTYPE_X86_ALL: u32 = 3;
+pub const CPU_SUBTYPE_X86_64_ALL: u32 = 3;
+pub const CPU_SUBTYPE_X86_ARCH1: u32 = 4;
+/// Haswell feature subset
+pub const CPU_SUBTYPE_X86_64_H: u32 = 8;
+
+/*
+ *	Mips subtypes.
+ */
+
+pub const CPU_SUBTYPE_MIPS_ALL: u32 = 0;
+pub const CPU_SUBTYPE_MIPS_R2300: u32 = 1;
+pub const CPU_SUBTYPE_MIPS_R2600: u32 = 2;
+pub const CPU_SUBTYPE_MIPS_R2800: u32 = 3;
+/// pmax
+pub const CPU_SUBTYPE_MIPS_R2000A: u32 = 4;
+pub const CPU_SUBTYPE_MIPS_R2000: u32 = 5;
+/// 3max
+pub const CPU_SUBTYPE_MIPS_R3000A: u32 = 6;
+pub const CPU_SUBTYPE_MIPS_R3000: u32 = 7;
+
+/*
+ *	MC98000 (PowerPC) subtypes
+ */
+pub const CPU_SUBTYPE_MC98000_ALL: u32 = 0;
+pub const CPU_SUBTYPE_MC98601: u32 = 1;
+
+/*
+ *	HPPA subtypes for Hewlett-Packard HP-PA family of
+ *	risc processors. Port by NeXT to 700 series.
+ */
+
+pub const CPU_SUBTYPE_HPPA_ALL: u32 = 0;
+pub const CPU_SUBTYPE_HPPA_7100LC: u32 = 1;
+
+/*
+ *	MC88000 subtypes.
+ */
+pub const CPU_SUBTYPE_MC88000_ALL: u32 = 0;
+pub const CPU_SUBTYPE_MC88100: u32 = 1;
+pub const CPU_SUBTYPE_MC88110: u32 = 2;
+
+/*
+ *	SPARC subtypes
+ */
+pub const CPU_SUBTYPE_SPARC_ALL: u32 = 0;
+
+/*
+ *	I860 subtypes
+ */
+pub const CPU_SUBTYPE_I860_ALL: u32 = 0;
+pub const CPU_SUBTYPE_I860_860: u32 = 1;
+
+/*
+ *	PowerPC subtypes
+ */
+pub const CPU_SUBTYPE_POWERPC_ALL: u32 = 0;
+pub const CPU_SUBTYPE_POWERPC_601: u32 = 1;
+pub const CPU_SUBTYPE_POWERPC_602: u32 = 2;
+pub const CPU_SUBTYPE_POWERPC_603: u32 = 3;
+pub const CPU_SUBTYPE_POWERPC_603E: u32 = 4;
+pub const CPU_SUBTYPE_POWERPC_603EV: u32 = 5;
+pub const CPU_SUBTYPE_POWERPC_604: u32 = 6;
+pub const CPU_SUBTYPE_POWERPC_604E: u32 = 7;
+pub const CPU_SUBTYPE_POWERPC_620: u32 = 8;
+pub const CPU_SUBTYPE_POWERPC_750: u32 = 9;
+pub const CPU_SUBTYPE_POWERPC_7400: u32 = 10;
+pub const CPU_SUBTYPE_POWERPC_7450: u32 = 11;
+pub const CPU_SUBTYPE_POWERPC_970: u32 = 100;
+
+/*
+ *	ARM subtypes
+ */
+pub const CPU_SUBTYPE_ARM_ALL: u32 = 0;
+pub const CPU_SUBTYPE_ARM_V4T: u32 = 5;
+pub const CPU_SUBTYPE_ARM_V6: u32 = 6;
+pub const CPU_SUBTYPE_ARM_V5TEJ: u32 = 7;
+pub const CPU_SUBTYPE_ARM_XSCALE: u32 = 8;
+/// ARMv7-A and ARMv7-R
+pub const CPU_SUBTYPE_ARM_V7: u32 = 9;
+/// Cortex A9
+pub const CPU_SUBTYPE_ARM_V7F: u32 = 10;
+/// Swift
+pub const CPU_SUBTYPE_ARM_V7S: u32 = 11;
+pub const CPU_SUBTYPE_ARM_V7K: u32 = 12;
+pub const CPU_SUBTYPE_ARM_V8: u32 = 13;
+/// Not meant to be run under xnu
+pub const CPU_SUBTYPE_ARM_V6M: u32 = 14;
+/// Not meant to be run under xnu
+pub const CPU_SUBTYPE_ARM_V7M: u32 = 15;
+/// Not meant to be run under xnu
+pub const CPU_SUBTYPE_ARM_V7EM: u32 = 16;
+/// Not meant to be run under xnu
+pub const CPU_SUBTYPE_ARM_V8M: u32 = 17;
+
+/*
+ *  ARM64 subtypes
+ */
+pub const CPU_SUBTYPE_ARM64_ALL: u32 = 0;
+pub const CPU_SUBTYPE_ARM64_V8: u32 = 1;
+pub const CPU_SUBTYPE_ARM64E: u32 = 2;
+
+/*
+ *  ARM64_32 subtypes
+ */
+pub const CPU_SUBTYPE_ARM64_32_ALL: u32 = 0;
+pub const CPU_SUBTYPE_ARM64_32_V8: u32 = 1;
+
+// Definitions from "/usr/include/mach/vm_prot.h".
+
+/// read permission
+pub const VM_PROT_READ: u32 = 0x01;
+/// write permission
+pub const VM_PROT_WRITE: u32 = 0x02;
+/// execute permission
+pub const VM_PROT_EXECUTE: u32 = 0x04;
+
+// Definitions from https://opensource.apple.com/source/dyld/dyld-210.2.3/launch-cache/dyld_cache_format.h.auto.html
+
+/// The dyld cache header.
+/// Corresponds to struct dyld_cache_header from dyld_cache_format.h.
+/// This header has grown over time. Only the fields up to and including dyld_base_address
+/// are guaranteed to be present. For all other fields, check the header size before
+/// accessing the field. The header size is stored in mapping_offset; the mappings start
+/// right after the theader.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct DyldCacheHeader<E: Endian> {
+    /// e.g. "dyld_v0    i386"
+    pub magic: [u8; 16],
+    /// file offset to first dyld_cache_mapping_info
+    pub mapping_offset: U32<E>, // offset: 0x10
+    /// number of dyld_cache_mapping_info entries
+    pub mapping_count: U32<E>, // offset: 0x14
+    /// file offset to first dyld_cache_image_info
+    pub images_offset: U32<E>, // offset: 0x18
+    /// number of dyld_cache_image_info entries
+    pub images_count: U32<E>, // offset: 0x1c
+    /// base address of dyld when cache was built
+    pub dyld_base_address: U64<E>, // offset: 0x20
+    ///
+    reserved1: [u8; 32], // offset: 0x28
+    /// file offset of where local symbols are stored
+    pub local_symbols_offset: U64<E>, // offset: 0x48
+    /// size of local symbols information
+    pub local_symbols_size: U64<E>, // offset: 0x50
+    /// unique value for each shared cache file
+    pub uuid: [u8; 16], // offset: 0x58
+    ///
+    reserved2: [u8; 32], // offset: 0x68
+    ///
+    reserved3: [u8; 32], // offset: 0x88
+    ///
+    reserved4: [u8; 32], // offset: 0xa8
+    ///
+    reserved5: [u8; 32], // offset: 0xc8
+    ///
+    reserved6: [u8; 32], // offset: 0xe8
+    ///
+    reserved7: [u8; 32], // offset: 0x108
+    ///
+    reserved8: [u8; 32], // offset: 0x128
+    ///
+    reserved9: [u8; 32], // offset: 0x148
+    ///
+    reserved10: [u8; 32], // offset: 0x168
+    /// file offset to first dyld_subcache_info
+    pub subcaches_offset: U32<E>, // offset: 0x188
+    /// number of dyld_subcache_info entries
+    pub subcaches_count: U32<E>, // offset: 0x18c
+    /// the UUID of the .symbols subcache
+    pub symbols_subcache_uuid: [u8; 16], // offset: 0x190
+    ///
+    reserved11: [u8; 32], // offset: 0x1a0
+    /// file offset to first dyld_cache_image_info
+    /// Use this  instead of images_offset if mapping_offset is at least 0x1c4.
+    pub images_across_all_subcaches_offset: U32<E>, // offset: 0x1c0
+    /// number of dyld_cache_image_info entries
+    /// Use this  instead of images_count if mapping_offset is at least 0x1c4.
+    pub images_across_all_subcaches_count: U32<E>, // offset: 0x1c4
+}
+
+/// Corresponds to struct dyld_cache_mapping_info from dyld_cache_format.h.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct DyldCacheMappingInfo<E: Endian> {
+    ///
+    pub address: U64<E>,
+    ///
+    pub size: U64<E>,
+    ///
+    pub file_offset: U64<E>,
+    ///
+    pub max_prot: U32<E>,
+    ///
+    pub init_prot: U32<E>,
+}
+
+/// Corresponds to struct dyld_cache_image_info from dyld_cache_format.h.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct DyldCacheImageInfo<E: Endian> {
+    ///
+    pub address: U64<E>,
+    ///
+    pub mod_time: U64<E>,
+    ///
+    pub inode: U64<E>,
+    ///
+    pub path_file_offset: U32<E>,
+    ///
+    pub pad: U32<E>,
+}
+
+/// Corresponds to a struct whose source code has not been published as of Nov 2021.
+/// Added in the dyld cache version which shipped with macOS 12 / iOS 15.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct DyldSubCacheInfo<E: Endian> {
+    /// The UUID of this subcache.
+    pub uuid: [u8; 16],
+    /// The size of this subcache plus all previous subcaches.
+    pub cumulative_size: U64<E>,
+}
+
+// Definitions from "/usr/include/mach-o/loader.h".
+
+/*
+ * This header file describes the structures of the file format for "fat"
+ * architecture specific file (wrapper design).  At the beginning of the file
+ * there is one `FatHeader` structure followed by a number of `FatArch*`
+ * structures.  For each architecture in the file, specified by a pair of
+ * cputype and cpusubtype, the `FatHeader` describes the file offset, file
+ * size and alignment in the file of the architecture specific member.
+ * The padded bytes in the file to place each member on it's specific alignment
+ * are defined to be read as zeros and can be left as "holes" if the file system
+ * can support them as long as they read as zeros.
+ *
+ * All structures defined here are always written and read to/from disk
+ * in big-endian order.
+ */
+
+pub const FAT_MAGIC: u32 = 0xcafe_babe;
+/// NXSwapLong(FAT_MAGIC)
+pub const FAT_CIGAM: u32 = 0xbeba_feca;
+
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct FatHeader {
+    /// FAT_MAGIC or FAT_MAGIC_64
+    pub magic: U32<BigEndian>,
+    /// number of structs that follow
+    pub nfat_arch: U32<BigEndian>,
+}
+
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct FatArch32 {
+    /// cpu specifier (int)
+    pub cputype: U32<BigEndian>,
+    /// machine specifier (int)
+    pub cpusubtype: U32<BigEndian>,
+    /// file offset to this object file
+    pub offset: U32<BigEndian>,
+    /// size of this object file
+    pub size: U32<BigEndian>,
+    /// alignment as a power of 2
+    pub align: U32<BigEndian>,
+}
+
+/*
+ * The support for the 64-bit fat file format described here is a work in
+ * progress and not yet fully supported in all the Apple Developer Tools.
+ *
+ * When a slice is greater than 4mb or an offset to a slice is greater than 4mb
+ * then the 64-bit fat file format is used.
+ */
+pub const FAT_MAGIC_64: u32 = 0xcafe_babf;
+/// NXSwapLong(FAT_MAGIC_64)
+pub const FAT_CIGAM_64: u32 = 0xbfba_feca;
+
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct FatArch64 {
+    /// cpu specifier (int)
+    pub cputype: U32<BigEndian>,
+    /// machine specifier (int)
+    pub cpusubtype: U32<BigEndian>,
+    /// file offset to this object file
+    pub offset: U64<BigEndian>,
+    /// size of this object file
+    pub size: U64<BigEndian>,
+    /// alignment as a power of 2
+    pub align: U32<BigEndian>,
+    /// reserved
+    pub reserved: U32<BigEndian>,
+}
+
+// Definitions from "/usr/include/mach-o/loader.h".
+
+/// The 32-bit mach header.
+///
+/// Appears at the very beginning of the object file for 32-bit architectures.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct MachHeader32<E: Endian> {
+    /// mach magic number identifier
+    pub magic: U32<BigEndian>,
+    /// cpu specifier
+    pub cputype: U32<E>,
+    /// machine specifier
+    pub cpusubtype: U32<E>,
+    /// type of file
+    pub filetype: U32<E>,
+    /// number of load commands
+    pub ncmds: U32<E>,
+    /// the size of all the load commands
+    pub sizeofcmds: U32<E>,
+    /// flags
+    pub flags: U32<E>,
+}
+
+// Values for `MachHeader32::magic`.
+/// the mach magic number
+pub const MH_MAGIC: u32 = 0xfeed_face;
+/// NXSwapInt(MH_MAGIC)
+pub const MH_CIGAM: u32 = 0xcefa_edfe;
+
+/// The 64-bit mach header.
+///
+/// Appears at the very beginning of object files for 64-bit architectures.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct MachHeader64<E: Endian> {
+    /// mach magic number identifier
+    pub magic: U32<BigEndian>,
+    /// cpu specifier
+    pub cputype: U32<E>,
+    /// machine specifier
+    pub cpusubtype: U32<E>,
+    /// type of file
+    pub filetype: U32<E>,
+    /// number of load commands
+    pub ncmds: U32<E>,
+    /// the size of all the load commands
+    pub sizeofcmds: U32<E>,
+    /// flags
+    pub flags: U32<E>,
+    /// reserved
+    pub reserved: U32<E>,
+}
+
+// Values for `MachHeader64::magic`.
+/// the 64-bit mach magic number
+pub const MH_MAGIC_64: u32 = 0xfeed_facf;
+/// NXSwapInt(MH_MAGIC_64)
+pub const MH_CIGAM_64: u32 = 0xcffa_edfe;
+
+/*
+ * The layout of the file depends on the filetype.  For all but the MH_OBJECT
+ * file type the segments are padded out and aligned on a segment alignment
+ * boundary for efficient demand pageing.  The MH_EXECUTE, MH_FVMLIB, MH_DYLIB,
+ * MH_DYLINKER and MH_BUNDLE file types also have the headers included as part
+ * of their first segment.
+ *
+ * The file type MH_OBJECT is a compact format intended as output of the
+ * assembler and input (and possibly output) of the link editor (the .o
+ * format).  All sections are in one unnamed segment with no segment padding.
+ * This format is used as an executable format when the file is so small the
+ * segment padding greatly increases its size.
+ *
+ * The file type MH_PRELOAD is an executable format intended for things that
+ * are not executed under the kernel (proms, stand alones, kernels, etc).  The
+ * format can be executed under the kernel but may demand paged it and not
+ * preload it before execution.
+ *
+ * A core file is in MH_CORE format and can be any in an arbritray legal
+ * Mach-O file.
+ */
+
+// Values for `MachHeader*::filetype`.
+/// relocatable object file
+pub const MH_OBJECT: u32 = 0x1;
+/// demand paged executable file
+pub const MH_EXECUTE: u32 = 0x2;
+/// fixed VM shared library file
+pub const MH_FVMLIB: u32 = 0x3;
+/// core file
+pub const MH_CORE: u32 = 0x4;
+/// preloaded executable file
+pub const MH_PRELOAD: u32 = 0x5;
+/// dynamically bound shared library
+pub const MH_DYLIB: u32 = 0x6;
+/// dynamic link editor
+pub const MH_DYLINKER: u32 = 0x7;
+/// dynamically bound bundle file
+pub const MH_BUNDLE: u32 = 0x8;
+/// shared library stub for static linking only, no section contents
+pub const MH_DYLIB_STUB: u32 = 0x9;
+/// companion file with only debug sections
+pub const MH_DSYM: u32 = 0xa;
+/// x86_64 kexts
+pub const MH_KEXT_BUNDLE: u32 = 0xb;
+/// set of mach-o's
+pub const MH_FILESET: u32 = 0xc;
+
+// Values for `MachHeader*::flags`.
+/// the object file has no undefined references
+pub const MH_NOUNDEFS: u32 = 0x1;
+/// the object file is the output of an incremental link against a base file and can't be link edited again
+pub const MH_INCRLINK: u32 = 0x2;
+/// the object file is input for the dynamic linker and can't be statically link edited again
+pub const MH_DYLDLINK: u32 = 0x4;
+/// the object file's undefined references are bound by the dynamic linker when loaded.
+pub const MH_BINDATLOAD: u32 = 0x8;
+/// the file has its dynamic undefined references prebound.
+pub const MH_PREBOUND: u32 = 0x10;
+/// the file has its read-only and read-write segments split
+pub const MH_SPLIT_SEGS: u32 = 0x20;
+/// the shared library init routine is to be run lazily via catching memory faults to its writeable segments (obsolete)
+pub const MH_LAZY_INIT: u32 = 0x40;
+/// the image is using two-level name space bindings
+pub const MH_TWOLEVEL: u32 = 0x80;
+/// the executable is forcing all images to use flat name space bindings
+pub const MH_FORCE_FLAT: u32 = 0x100;
+/// this umbrella guarantees no multiple definitions of symbols in its sub-images so the two-level namespace hints can always be used.
+pub const MH_NOMULTIDEFS: u32 = 0x200;
+/// do not have dyld notify the prebinding agent about this executable
+pub const MH_NOFIXPREBINDING: u32 = 0x400;
+/// the binary is not prebound but can have its prebinding redone. only used when MH_PREBOUND is not set.
+pub const MH_PREBINDABLE: u32 = 0x800;
+/// indicates that this binary binds to all two-level namespace modules of its dependent libraries. only used when MH_PREBINDABLE and MH_TWOLEVEL are both set.
+pub const MH_ALLMODSBOUND: u32 = 0x1000;
+/// safe to divide up the sections into sub-sections via symbols for dead code stripping
+pub const MH_SUBSECTIONS_VIA_SYMBOLS: u32 = 0x2000;
+/// the binary has been canonicalized via the unprebind operation
+pub const MH_CANONICAL: u32 = 0x4000;
+/// the final linked image contains external weak symbols
+pub const MH_WEAK_DEFINES: u32 = 0x8000;
+/// the final linked image uses weak symbols
+pub const MH_BINDS_TO_WEAK: u32 = 0x10000;
+/// When this bit is set, all stacks in the task will be given stack execution privilege.  Only used in MH_EXECUTE filetypes.
+pub const MH_ALLOW_STACK_EXECUTION: u32 = 0x20000;
+/// When this bit is set, the binary declares it is safe for use in processes with uid zero
+pub const MH_ROOT_SAFE: u32 = 0x40000;
+/// When this bit is set, the binary declares it is safe for use in processes when issetugid() is true
+pub const MH_SETUID_SAFE: u32 = 0x80000;
+/// When this bit is set on a dylib, the static linker does not need to examine dependent dylibs to see if any are re-exported
+pub const MH_NO_REEXPORTED_DYLIBS: u32 = 0x10_0000;
+/// When this bit is set, the OS will load the main executable at a random address.  Only used in MH_EXECUTE filetypes.
+pub const MH_PIE: u32 = 0x20_0000;
+/// Only for use on dylibs.  When linking against a dylib that has this bit set, the static linker will automatically not create a LC_LOAD_DYLIB load command to the dylib if no symbols are being referenced from the dylib.
+pub const MH_DEAD_STRIPPABLE_DYLIB: u32 = 0x40_0000;
+/// Contains a section of type S_THREAD_LOCAL_VARIABLES
+pub const MH_HAS_TLV_DESCRIPTORS: u32 = 0x80_0000;
+/// When this bit is set, the OS will run the main executable with a non-executable heap even on platforms (e.g. i386) that don't require it. Only used in MH_EXECUTE filetypes.
+pub const MH_NO_HEAP_EXECUTION: u32 = 0x100_0000;
+/// The code was linked for use in an application extension.
+pub const MH_APP_EXTENSION_SAFE: u32 = 0x0200_0000;
+/// The external symbols listed in the nlist symbol table do not include all the symbols listed in the dyld info.
+pub const MH_NLIST_OUTOFSYNC_WITH_DYLDINFO: u32 = 0x0400_0000;
+/// Allow LC_MIN_VERSION_MACOS and LC_BUILD_VERSION load commands with
+/// the platforms macOS, iOSMac, iOSSimulator, tvOSSimulator and watchOSSimulator.
+pub const MH_SIM_SUPPORT: u32 = 0x0800_0000;
+/// Only for use on dylibs. When this bit is set, the dylib is part of the dyld
+/// shared cache, rather than loose in the filesystem.
+pub const MH_DYLIB_IN_CACHE: u32 = 0x8000_0000;
+
+/// Common fields at the start of every load command.
+///
+/// The load commands directly follow the mach_header.  The total size of all
+/// of the commands is given by the sizeofcmds field in the mach_header.  All
+/// load commands must have as their first two fields `cmd` and `cmdsize`.  The `cmd`
+/// field is filled in with a constant for that command type.  Each command type
+/// has a structure specifically for it.  The `cmdsize` field is the size in bytes
+/// of the particular load command structure plus anything that follows it that
+/// is a part of the load command (i.e. section structures, strings, etc.).  To
+/// advance to the next load command the `cmdsize` can be added to the offset or
+/// pointer of the current load command.  The `cmdsize` for 32-bit architectures
+/// MUST be a multiple of 4 bytes and for 64-bit architectures MUST be a multiple
+/// of 8 bytes (these are forever the maximum alignment of any load commands).
+/// The padded bytes must be zero.  All tables in the object file must also
+/// follow these rules so the file can be memory mapped.  Otherwise the pointers
+/// to these tables will not work well or at all on some machines.  With all
+/// padding zeroed like objects will compare byte for byte.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct LoadCommand<E: Endian> {
+    /// Type of load command.
+    ///
+    /// One of the `LC_*` constants.
+    pub cmd: U32<E>,
+    /// Total size of command in bytes.
+    pub cmdsize: U32<E>,
+}
+
+/*
+ * After MacOS X 10.1 when a new load command is added that is required to be
+ * understood by the dynamic linker for the image to execute properly the
+ * LC_REQ_DYLD bit will be or'ed into the load command constant.  If the dynamic
+ * linker sees such a load command it it does not understand will issue a
+ * "unknown load command required for execution" error and refuse to use the
+ * image.  Other load commands without this bit that are not understood will
+ * simply be ignored.
+ */
+pub const LC_REQ_DYLD: u32 = 0x8000_0000;
+
+/* Constants for the cmd field of all load commands, the type */
+/// segment of this file to be mapped
+pub const LC_SEGMENT: u32 = 0x1;
+/// link-edit stab symbol table info
+pub const LC_SYMTAB: u32 = 0x2;
+/// link-edit gdb symbol table info (obsolete)
+pub const LC_SYMSEG: u32 = 0x3;
+/// thread
+pub const LC_THREAD: u32 = 0x4;
+/// unix thread (includes a stack)
+pub const LC_UNIXTHREAD: u32 = 0x5;
+/// load a specified fixed VM shared library
+pub const LC_LOADFVMLIB: u32 = 0x6;
+/// fixed VM shared library identification
+pub const LC_IDFVMLIB: u32 = 0x7;
+/// object identification info (obsolete)
+pub const LC_IDENT: u32 = 0x8;
+/// fixed VM file inclusion (internal use)
+pub const LC_FVMFILE: u32 = 0x9;
+/// prepage command (internal use)
+pub const LC_PREPAGE: u32 = 0xa;
+/// dynamic link-edit symbol table info
+pub const LC_DYSYMTAB: u32 = 0xb;
+/// load a dynamically linked shared library
+pub const LC_LOAD_DYLIB: u32 = 0xc;
+/// dynamically linked shared lib ident
+pub const LC_ID_DYLIB: u32 = 0xd;
+/// load a dynamic linker
+pub const LC_LOAD_DYLINKER: u32 = 0xe;
+/// dynamic linker identification
+pub const LC_ID_DYLINKER: u32 = 0xf;
+/// modules prebound for a dynamically linked shared library
+pub const LC_PREBOUND_DYLIB: u32 = 0x10;
+/// image routines
+pub const LC_ROUTINES: u32 = 0x11;
+/// sub framework
+pub const LC_SUB_FRAMEWORK: u32 = 0x12;
+/// sub umbrella
+pub const LC_SUB_UMBRELLA: u32 = 0x13;
+/// sub client
+pub const LC_SUB_CLIENT: u32 = 0x14;
+/// sub library
+pub const LC_SUB_LIBRARY: u32 = 0x15;
+/// two-level namespace lookup hints
+pub const LC_TWOLEVEL_HINTS: u32 = 0x16;
+/// prebind checksum
+pub const LC_PREBIND_CKSUM: u32 = 0x17;
+/// load a dynamically linked shared library that is allowed to be missing
+/// (all symbols are weak imported).
+pub const LC_LOAD_WEAK_DYLIB: u32 = 0x18 | LC_REQ_DYLD;
+/// 64-bit segment of this file to be mapped
+pub const LC_SEGMENT_64: u32 = 0x19;
+/// 64-bit image routines
+pub const LC_ROUTINES_64: u32 = 0x1a;
+/// the uuid
+pub const LC_UUID: u32 = 0x1b;
+/// runpath additions
+pub const LC_RPATH: u32 = 0x1c | LC_REQ_DYLD;
+/// local of code signature
+pub const LC_CODE_SIGNATURE: u32 = 0x1d;
+/// local of info to split segments
+pub const LC_SEGMENT_SPLIT_INFO: u32 = 0x1e;
+/// load and re-export dylib
+pub const LC_REEXPORT_DYLIB: u32 = 0x1f | LC_REQ_DYLD;
+/// delay load of dylib until first use
+pub const LC_LAZY_LOAD_DYLIB: u32 = 0x20;
+/// encrypted segment information
+pub const LC_ENCRYPTION_INFO: u32 = 0x21;
+/// compressed dyld information
+pub const LC_DYLD_INFO: u32 = 0x22;
+/// compressed dyld information only
+pub const LC_DYLD_INFO_ONLY: u32 = 0x22 | LC_REQ_DYLD;
+/// load upward dylib
+pub const LC_LOAD_UPWARD_DYLIB: u32 = 0x23 | LC_REQ_DYLD;
+/// build for MacOSX min OS version
+pub const LC_VERSION_MIN_MACOSX: u32 = 0x24;
+/// build for iPhoneOS min OS version
+pub const LC_VERSION_MIN_IPHONEOS: u32 = 0x25;
+/// compressed table of function start addresses
+pub const LC_FUNCTION_STARTS: u32 = 0x26;
+/// string for dyld to treat like environment variable
+pub const LC_DYLD_ENVIRONMENT: u32 = 0x27;
+/// replacement for LC_UNIXTHREAD
+pub const LC_MAIN: u32 = 0x28 | LC_REQ_DYLD;
+/// table of non-instructions in __text
+pub const LC_DATA_IN_CODE: u32 = 0x29;
+/// source version used to build binary
+pub const LC_SOURCE_VERSION: u32 = 0x2A;
+/// Code signing DRs copied from linked dylibs
+pub const LC_DYLIB_CODE_SIGN_DRS: u32 = 0x2B;
+/// 64-bit encrypted segment information
+pub const LC_ENCRYPTION_INFO_64: u32 = 0x2C;
+/// linker options in MH_OBJECT files
+pub const LC_LINKER_OPTION: u32 = 0x2D;
+/// optimization hints in MH_OBJECT files
+pub const LC_LINKER_OPTIMIZATION_HINT: u32 = 0x2E;
+/// build for AppleTV min OS version
+pub const LC_VERSION_MIN_TVOS: u32 = 0x2F;
+/// build for Watch min OS version
+pub const LC_VERSION_MIN_WATCHOS: u32 = 0x30;
+/// arbitrary data included within a Mach-O file
+pub const LC_NOTE: u32 = 0x31;
+/// build for platform min OS version
+pub const LC_BUILD_VERSION: u32 = 0x32;
+/// used with `LinkeditDataCommand`, payload is trie
+pub const LC_DYLD_EXPORTS_TRIE: u32 = 0x33 | LC_REQ_DYLD;
+/// used with `LinkeditDataCommand`
+pub const LC_DYLD_CHAINED_FIXUPS: u32 = 0x34 | LC_REQ_DYLD;
+/// used with `FilesetEntryCommand`
+pub const LC_FILESET_ENTRY: u32 = 0x35 | LC_REQ_DYLD;
+
+/// A variable length string in a load command.
+///
+/// The strings are stored just after the load command structure and
+/// the offset is from the start of the load command structure.  The size
+/// of the string is reflected in the `cmdsize` field of the load command.
+/// Once again any padded bytes to bring the `cmdsize` field to a multiple
+/// of 4 bytes must be zero.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct LcStr<E: Endian> {
+    /// offset to the string
+    pub offset: U32<E>,
+}
+
+/// 32-bit segment load command.
+///
+/// The segment load command indicates that a part of this file is to be
+/// mapped into the task's address space.  The size of this segment in memory,
+/// vmsize, maybe equal to or larger than the amount to map from this file,
+/// filesize.  The file is mapped starting at fileoff to the beginning of
+/// the segment in memory, vmaddr.  The rest of the memory of the segment,
+/// if any, is allocated zero fill on demand.  The segment's maximum virtual
+/// memory protection and initial virtual memory protection are specified
+/// by the maxprot and initprot fields.  If the segment has sections then the
+/// `Section32` structures directly follow the segment command and their size is
+/// reflected in `cmdsize`.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct SegmentCommand32<E: Endian> {
+    /// LC_SEGMENT
+    pub cmd: U32<E>,
+    /// includes sizeof section structs
+    pub cmdsize: U32<E>,
+    /// segment name
+    pub segname: [u8; 16],
+    /// memory address of this segment
+    pub vmaddr: U32<E>,
+    /// memory size of this segment
+    pub vmsize: U32<E>,
+    /// file offset of this segment
+    pub fileoff: U32<E>,
+    /// amount to map from the file
+    pub filesize: U32<E>,
+    /// maximum VM protection
+    pub maxprot: U32<E>,
+    /// initial VM protection
+    pub initprot: U32<E>,
+    /// number of sections in segment
+    pub nsects: U32<E>,
+    /// flags
+    pub flags: U32<E>,
+}
+
+/// 64-bit segment load command.
+///
+/// The 64-bit segment load command indicates that a part of this file is to be
+/// mapped into a 64-bit task's address space.  If the 64-bit segment has
+/// sections then `Section64` structures directly follow the 64-bit segment
+/// command and their size is reflected in `cmdsize`.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct SegmentCommand64<E: Endian> {
+    /// LC_SEGMENT_64
+    pub cmd: U32<E>,
+    /// includes sizeof section_64 structs
+    pub cmdsize: U32<E>,
+    /// segment name
+    pub segname: [u8; 16],
+    /// memory address of this segment
+    pub vmaddr: U64<E>,
+    /// memory size of this segment
+    pub vmsize: U64<E>,
+    /// file offset of this segment
+    pub fileoff: U64<E>,
+    /// amount to map from the file
+    pub filesize: U64<E>,
+    /// maximum VM protection
+    pub maxprot: U32<E>,
+    /// initial VM protection
+    pub initprot: U32<E>,
+    /// number of sections in segment
+    pub nsects: U32<E>,
+    /// flags
+    pub flags: U32<E>,
+}
+
+// Values for `SegmentCommand*::flags`.
+/// the file contents for this segment is for the high part of the VM space, the low part is zero filled (for stacks in core files)
+pub const SG_HIGHVM: u32 = 0x1;
+/// this segment is the VM that is allocated by a fixed VM library, for overlap checking in the link editor
+pub const SG_FVMLIB: u32 = 0x2;
+/// this segment has nothing that was relocated in it and nothing relocated to it, that is it maybe safely replaced without relocation
+pub const SG_NORELOC: u32 = 0x4;
+/// This segment is protected.  If the segment starts at file offset 0, the first page of the segment is not protected.  All other pages of the segment are protected.
+pub const SG_PROTECTED_VERSION_1: u32 = 0x8;
+/// This segment is made read-only after fixups
+pub const SG_READ_ONLY: u32 = 0x10;
+
+/*
+ * A segment is made up of zero or more sections.  Non-MH_OBJECT files have
+ * all of their segments with the proper sections in each, and padded to the
+ * specified segment alignment when produced by the link editor.  The first
+ * segment of a MH_EXECUTE and MH_FVMLIB format file contains the mach_header
+ * and load commands of the object file before its first section.  The zero
+ * fill sections are always last in their segment (in all formats).  This
+ * allows the zeroed segment padding to be mapped into memory where zero fill
+ * sections might be. The gigabyte zero fill sections, those with the section
+ * type S_GB_ZEROFILL, can only be in a segment with sections of this type.
+ * These segments are then placed after all other segments.
+ *
+ * The MH_OBJECT format has all of its sections in one segment for
+ * compactness.  There is no padding to a specified segment boundary and the
+ * mach_header and load commands are not part of the segment.
+ *
+ * Sections with the same section name, sectname, going into the same segment,
+ * segname, are combined by the link editor.  The resulting section is aligned
+ * to the maximum alignment of the combined sections and is the new section's
+ * alignment.  The combined sections are aligned to their original alignment in
+ * the combined section.  Any padded bytes to get the specified alignment are
+ * zeroed.
+ *
+ * The format of the relocation entries referenced by the reloff and nreloc
+ * fields of the section structure for mach object files is described in the
+ * header file <reloc.h>.
+ */
+/// 32-bit section.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct Section32<E: Endian> {
+    /// name of this section
+    pub sectname: [u8; 16],
+    /// segment this section goes in
+    pub segname: [u8; 16],
+    /// memory address of this section
+    pub addr: U32<E>,
+    /// size in bytes of this section
+    pub size: U32<E>,
+    /// file offset of this section
+    pub offset: U32<E>,
+    /// section alignment (power of 2)
+    pub align: U32<E>,
+    /// file offset of relocation entries
+    pub reloff: U32<E>,
+    /// number of relocation entries
+    pub nreloc: U32<E>,
+    /// flags (section type and attributes)
+    pub flags: U32<E>,
+    /// reserved (for offset or index)
+    pub reserved1: U32<E>,
+    /// reserved (for count or sizeof)
+    pub reserved2: U32<E>,
+}
+
+/// 64-bit section.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct Section64<E: Endian> {
+    /// name of this section
+    pub sectname: [u8; 16],
+    /// segment this section goes in
+    pub segname: [u8; 16],
+    /// memory address of this section
+    pub addr: U64<E>,
+    /// size in bytes of this section
+    pub size: U64<E>,
+    /// file offset of this section
+    pub offset: U32<E>,
+    /// section alignment (power of 2)
+    pub align: U32<E>,
+    /// file offset of relocation entries
+    pub reloff: U32<E>,
+    /// number of relocation entries
+    pub nreloc: U32<E>,
+    /// flags (section type and attributes)
+    pub flags: U32<E>,
+    /// reserved (for offset or index)
+    pub reserved1: U32<E>,
+    /// reserved (for count or sizeof)
+    pub reserved2: U32<E>,
+    /// reserved
+    pub reserved3: U32<E>,
+}
+
+/*
+ * The flags field of a section structure is separated into two parts a section
+ * type and section attributes.  The section types are mutually exclusive (it
+ * can only have one type) but the section attributes are not (it may have more
+ * than one attribute).
+ */
+/// 256 section types
+pub const SECTION_TYPE: u32 = 0x0000_00ff;
+/// 24 section attributes
+pub const SECTION_ATTRIBUTES: u32 = 0xffff_ff00;
+
+/* Constants for the type of a section */
+/// regular section
+pub const S_REGULAR: u32 = 0x0;
+/// zero fill on demand section
+pub const S_ZEROFILL: u32 = 0x1;
+/// section with only literal C strings
+pub const S_CSTRING_LITERALS: u32 = 0x2;
+/// section with only 4 byte literals
+pub const S_4BYTE_LITERALS: u32 = 0x3;
+/// section with only 8 byte literals
+pub const S_8BYTE_LITERALS: u32 = 0x4;
+/// section with only pointers to literals
+pub const S_LITERAL_POINTERS: u32 = 0x5;
+/*
+ * For the two types of symbol pointers sections and the symbol stubs section
+ * they have indirect symbol table entries.  For each of the entries in the
+ * section the indirect symbol table entries, in corresponding order in the
+ * indirect symbol table, start at the index stored in the reserved1 field
+ * of the section structure.  Since the indirect symbol table entries
+ * correspond to the entries in the section the number of indirect symbol table
+ * entries is inferred from the size of the section divided by the size of the
+ * entries in the section.  For symbol pointers sections the size of the entries
+ * in the section is 4 bytes and for symbol stubs sections the byte size of the
+ * stubs is stored in the reserved2 field of the section structure.
+ */
+/// section with only non-lazy symbol pointers
+pub const S_NON_LAZY_SYMBOL_POINTERS: u32 = 0x6;
+/// section with only lazy symbol pointers
+pub const S_LAZY_SYMBOL_POINTERS: u32 = 0x7;
+/// section with only symbol stubs, byte size of stub in the reserved2 field
+pub const S_SYMBOL_STUBS: u32 = 0x8;
+/// section with only function pointers for initialization
+pub const S_MOD_INIT_FUNC_POINTERS: u32 = 0x9;
+/// section with only function pointers for termination
+pub const S_MOD_TERM_FUNC_POINTERS: u32 = 0xa;
+/// section contains symbols that are to be coalesced
+pub const S_COALESCED: u32 = 0xb;
+/// zero fill on demand section (that can be larger than 4 gigabytes)
+pub const S_GB_ZEROFILL: u32 = 0xc;
+/// section with only pairs of function pointers for interposing
+pub const S_INTERPOSING: u32 = 0xd;
+/// section with only 16 byte literals
+pub const S_16BYTE_LITERALS: u32 = 0xe;
+/// section contains DTrace Object Format
+pub const S_DTRACE_DOF: u32 = 0xf;
+/// section with only lazy symbol pointers to lazy loaded dylibs
+pub const S_LAZY_DYLIB_SYMBOL_POINTERS: u32 = 0x10;
+/*
+ * Section types to support thread local variables
+ */
+/// template of initial values for TLVs
+pub const S_THREAD_LOCAL_REGULAR: u32 = 0x11;
+/// template of initial values for TLVs
+pub const S_THREAD_LOCAL_ZEROFILL: u32 = 0x12;
+/// TLV descriptors
+pub const S_THREAD_LOCAL_VARIABLES: u32 = 0x13;
+/// pointers to TLV descriptors
+pub const S_THREAD_LOCAL_VARIABLE_POINTERS: u32 = 0x14;
+/// functions to call to initialize TLV values
+pub const S_THREAD_LOCAL_INIT_FUNCTION_POINTERS: u32 = 0x15;
+/// 32-bit offsets to initializers
+pub const S_INIT_FUNC_OFFSETS: u32 = 0x16;
+
+/*
+ * Constants for the section attributes part of the flags field of a section
+ * structure.
+ */
+/// User setable attributes
+pub const SECTION_ATTRIBUTES_USR: u32 = 0xff00_0000;
+/// section contains only true machine instructions
+pub const S_ATTR_PURE_INSTRUCTIONS: u32 = 0x8000_0000;
+/// section contains coalesced symbols that are not to be in a ranlib table of contents
+pub const S_ATTR_NO_TOC: u32 = 0x4000_0000;
+/// ok to strip static symbols in this section in files with the MH_DYLDLINK flag
+pub const S_ATTR_STRIP_STATIC_SYMS: u32 = 0x2000_0000;
+/// no dead stripping
+pub const S_ATTR_NO_DEAD_STRIP: u32 = 0x1000_0000;
+/// blocks are live if they reference live blocks
+pub const S_ATTR_LIVE_SUPPORT: u32 = 0x0800_0000;
+/// Used with i386 code stubs written on by dyld
+pub const S_ATTR_SELF_MODIFYING_CODE: u32 = 0x0400_0000;
+/*
+ * If a segment contains any sections marked with S_ATTR_DEBUG then all
+ * sections in that segment must have this attribute.  No section other than
+ * a section marked with this attribute may reference the contents of this
+ * section.  A section with this attribute may contain no symbols and must have
+ * a section type S_REGULAR.  The static linker will not copy section contents
+ * from sections with this attribute into its output file.  These sections
+ * generally contain DWARF debugging info.
+ */
+/// a debug section
+pub const S_ATTR_DEBUG: u32 = 0x0200_0000;
+/// system setable attributes
+pub const SECTION_ATTRIBUTES_SYS: u32 = 0x00ff_ff00;
+/// section contains some machine instructions
+pub const S_ATTR_SOME_INSTRUCTIONS: u32 = 0x0000_0400;
+/// section has external relocation entries
+pub const S_ATTR_EXT_RELOC: u32 = 0x0000_0200;
+/// section has local relocation entries
+pub const S_ATTR_LOC_RELOC: u32 = 0x0000_0100;
+
+/*
+ * The names of segments and sections in them are mostly meaningless to the
+ * link-editor.  But there are few things to support traditional UNIX
+ * executables that require the link-editor and assembler to use some names
+ * agreed upon by convention.
+ *
+ * The initial protection of the "__TEXT" segment has write protection turned
+ * off (not writeable).
+ *
+ * The link-editor will allocate common symbols at the end of the "__common"
+ * section in the "__DATA" segment.  It will create the section and segment
+ * if needed.
+ */
+
+/* The currently known segment names and the section names in those segments */
+
+/// the pagezero segment which has no protections and catches NULL references for MH_EXECUTE files
+pub const SEG_PAGEZERO: &str = "__PAGEZERO";
+
+/// the tradition UNIX text segment
+pub const SEG_TEXT: &str = "__TEXT";
+/// the real text part of the text section no headers, and no padding
+pub const SECT_TEXT: &str = "__text";
+/// the fvmlib initialization section
+pub const SECT_FVMLIB_INIT0: &str = "__fvmlib_init0";
+/// the section following the fvmlib initialization section
+pub const SECT_FVMLIB_INIT1: &str = "__fvmlib_init1";
+
+/// the tradition UNIX data segment
+pub const SEG_DATA: &str = "__DATA";
+/// the real initialized data section no padding, no bss overlap
+pub const SECT_DATA: &str = "__data";
+/// the real uninitialized data section no padding
+pub const SECT_BSS: &str = "__bss";
+/// the section common symbols are allocated in by the link editor
+pub const SECT_COMMON: &str = "__common";
+
+/// objective-C runtime segment
+pub const SEG_OBJC: &str = "__OBJC";
+/// symbol table
+pub const SECT_OBJC_SYMBOLS: &str = "__symbol_table";
+/// module information
+pub const SECT_OBJC_MODULES: &str = "__module_info";
+/// string table
+pub const SECT_OBJC_STRINGS: &str = "__selector_strs";
+/// string table
+pub const SECT_OBJC_REFS: &str = "__selector_refs";
+
+/// the icon segment
+pub const SEG_ICON: &str = "__ICON";
+/// the icon headers
+pub const SECT_ICON_HEADER: &str = "__header";
+/// the icons in tiff format
+pub const SECT_ICON_TIFF: &str = "__tiff";
+
+/// the segment containing all structs created and maintained by the link editor.  Created with -seglinkedit option to ld(1) for MH_EXECUTE and FVMLIB file types only
+pub const SEG_LINKEDIT: &str = "__LINKEDIT";
+
+/// the segment overlapping with linkedit containing linking information
+pub const SEG_LINKINFO: &str = "__LINKINFO";
+
+/// the unix stack segment
+pub const SEG_UNIXSTACK: &str = "__UNIXSTACK";
+
+/// the segment for the self (dyld) modifying code stubs that has read, write and execute permissions
+pub const SEG_IMPORT: &str = "__IMPORT";
+
+/*
+ * Fixed virtual memory shared libraries are identified by two things.  The
+ * target pathname (the name of the library as found for execution), and the
+ * minor version number.  The address of where the headers are loaded is in
+ * header_addr. (THIS IS OBSOLETE and no longer supported).
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct Fvmlib<E: Endian> {
+    /// library's target pathname
+    pub name: LcStr<E>,
+    /// library's minor version number
+    pub minor_version: U32<E>,
+    /// library's header address
+    pub header_addr: U32<E>,
+}
+
+/*
+ * A fixed virtual shared library (filetype == MH_FVMLIB in the mach header)
+ * contains a `FvmlibCommand` (cmd == LC_IDFVMLIB) to identify the library.
+ * An object that uses a fixed virtual shared library also contains a
+ * `FvmlibCommand` (cmd == LC_LOADFVMLIB) for each library it uses.
+ * (THIS IS OBSOLETE and no longer supported).
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct FvmlibCommand<E: Endian> {
+    /// LC_IDFVMLIB or LC_LOADFVMLIB
+    pub cmd: U32<E>,
+    /// includes pathname string
+    pub cmdsize: U32<E>,
+    /// the library identification
+    pub fvmlib: Fvmlib<E>,
+}
+
+/*
+ * Dynamically linked shared libraries are identified by two things.  The
+ * pathname (the name of the library as found for execution), and the
+ * compatibility version number.  The pathname must match and the compatibility
+ * number in the user of the library must be greater than or equal to the
+ * library being used.  The time stamp is used to record the time a library was
+ * built and copied into user so it can be use to determined if the library used
+ * at runtime is exactly the same as used to built the program.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct Dylib<E: Endian> {
+    /// library's path name
+    pub name: LcStr<E>,
+    /// library's build time stamp
+    pub timestamp: U32<E>,
+    /// library's current version number
+    pub current_version: U32<E>,
+    /// library's compatibility vers number
+    pub compatibility_version: U32<E>,
+}
+
+/*
+ * A dynamically linked shared library (filetype == MH_DYLIB in the mach header)
+ * contains a `DylibCommand` (cmd == LC_ID_DYLIB) to identify the library.
+ * An object that uses a dynamically linked shared library also contains a
+ * `DylibCommand` (cmd == LC_LOAD_DYLIB, LC_LOAD_WEAK_DYLIB, or
+ * LC_REEXPORT_DYLIB) for each library it uses.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct DylibCommand<E: Endian> {
+    /// LC_ID_DYLIB, LC_LOAD_{,WEAK_}DYLIB, LC_REEXPORT_DYLIB
+    pub cmd: U32<E>,
+    /// includes pathname string
+    pub cmdsize: U32<E>,
+    /// the library identification
+    pub dylib: Dylib<E>,
+}
+
+/*
+ * A dynamically linked shared library may be a subframework of an umbrella
+ * framework.  If so it will be linked with "-umbrella umbrella_name" where
+ * Where "umbrella_name" is the name of the umbrella framework. A subframework
+ * can only be linked against by its umbrella framework or other subframeworks
+ * that are part of the same umbrella framework.  Otherwise the static link
+ * editor produces an error and states to link against the umbrella framework.
+ * The name of the umbrella framework for subframeworks is recorded in the
+ * following structure.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct SubFrameworkCommand<E: Endian> {
+    /// LC_SUB_FRAMEWORK
+    pub cmd: U32<E>,
+    /// includes umbrella string
+    pub cmdsize: U32<E>,
+    /// the umbrella framework name
+    pub umbrella: LcStr<E>,
+}
+
+/*
+ * For dynamically linked shared libraries that are subframework of an umbrella
+ * framework they can allow clients other than the umbrella framework or other
+ * subframeworks in the same umbrella framework.  To do this the subframework
+ * is built with "-allowable_client client_name" and an LC_SUB_CLIENT load
+ * command is created for each -allowable_client flag.  The client_name is
+ * usually a framework name.  It can also be a name used for bundles clients
+ * where the bundle is built with "-client_name client_name".
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct SubClientCommand<E: Endian> {
+    /// LC_SUB_CLIENT
+    pub cmd: U32<E>,
+    /// includes client string
+    pub cmdsize: U32<E>,
+    /// the client name
+    pub client: LcStr<E>,
+}
+
+/*
+ * A dynamically linked shared library may be a sub_umbrella of an umbrella
+ * framework.  If so it will be linked with "-sub_umbrella umbrella_name" where
+ * Where "umbrella_name" is the name of the sub_umbrella framework.  When
+ * statically linking when -twolevel_namespace is in effect a twolevel namespace
+ * umbrella framework will only cause its subframeworks and those frameworks
+ * listed as sub_umbrella frameworks to be implicited linked in.  Any other
+ * dependent dynamic libraries will not be linked it when -twolevel_namespace
+ * is in effect.  The primary library recorded by the static linker when
+ * resolving a symbol in these libraries will be the umbrella framework.
+ * Zero or more sub_umbrella frameworks may be use by an umbrella framework.
+ * The name of a sub_umbrella framework is recorded in the following structure.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct SubUmbrellaCommand<E: Endian> {
+    /// LC_SUB_UMBRELLA
+    pub cmd: U32<E>,
+    /// includes sub_umbrella string
+    pub cmdsize: U32<E>,
+    /// the sub_umbrella framework name
+    pub sub_umbrella: LcStr<E>,
+}
+
+/*
+ * A dynamically linked shared library may be a sub_library of another shared
+ * library.  If so it will be linked with "-sub_library library_name" where
+ * Where "library_name" is the name of the sub_library shared library.  When
+ * statically linking when -twolevel_namespace is in effect a twolevel namespace
+ * shared library will only cause its subframeworks and those frameworks
+ * listed as sub_umbrella frameworks and libraries listed as sub_libraries to
+ * be implicited linked in.  Any other dependent dynamic libraries will not be
+ * linked it when -twolevel_namespace is in effect.  The primary library
+ * recorded by the static linker when resolving a symbol in these libraries
+ * will be the umbrella framework (or dynamic library). Zero or more sub_library
+ * shared libraries may be use by an umbrella framework or (or dynamic library).
+ * The name of a sub_library framework is recorded in the following structure.
+ * For example /usr/lib/libobjc_profile.A.dylib would be recorded as "libobjc".
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct SubLibraryCommand<E: Endian> {
+    /// LC_SUB_LIBRARY
+    pub cmd: U32<E>,
+    /// includes sub_library string
+    pub cmdsize: U32<E>,
+    /// the sub_library name
+    pub sub_library: LcStr<E>,
+}
+
+/*
+ * A program (filetype == MH_EXECUTE) that is
+ * prebound to its dynamic libraries has one of these for each library that
+ * the static linker used in prebinding.  It contains a bit vector for the
+ * modules in the library.  The bits indicate which modules are bound (1) and
+ * which are not (0) from the library.  The bit for module 0 is the low bit
+ * of the first byte.  So the bit for the Nth module is:
+ * (linked_modules[N/8] >> N%8) & 1
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct PreboundDylibCommand<E: Endian> {
+    /// LC_PREBOUND_DYLIB
+    pub cmd: U32<E>,
+    /// includes strings
+    pub cmdsize: U32<E>,
+    /// library's path name
+    pub name: LcStr<E>,
+    /// number of modules in library
+    pub nmodules: U32<E>,
+    /// bit vector of linked modules
+    pub linked_modules: LcStr<E>,
+}
+
+/*
+ * A program that uses a dynamic linker contains a `DylinkerCommand` to identify
+ * the name of the dynamic linker (LC_LOAD_DYLINKER).  And a dynamic linker
+ * contains a `DylinkerCommand` to identify the dynamic linker (LC_ID_DYLINKER).
+ * A file can have at most one of these.
+ * This struct is also used for the LC_DYLD_ENVIRONMENT load command and
+ * contains string for dyld to treat like environment variable.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct DylinkerCommand<E: Endian> {
+    /// LC_ID_DYLINKER, LC_LOAD_DYLINKER or LC_DYLD_ENVIRONMENT
+    pub cmd: U32<E>,
+    /// includes pathname string
+    pub cmdsize: U32<E>,
+    /// dynamic linker's path name
+    pub name: LcStr<E>,
+}
+
+/*
+ * Thread commands contain machine-specific data structures suitable for
+ * use in the thread state primitives.  The machine specific data structures
+ * follow the struct `ThreadCommand` as follows.
+ * Each flavor of machine specific data structure is preceded by an uint32_t
+ * constant for the flavor of that data structure, an uint32_t that is the
+ * count of uint32_t's of the size of the state data structure and then
+ * the state data structure follows.  This triple may be repeated for many
+ * flavors.  The constants for the flavors, counts and state data structure
+ * definitions are expected to be in the header file <machine/thread_status.h>.
+ * These machine specific data structures sizes must be multiples of
+ * 4 bytes.  The `cmdsize` reflects the total size of the `ThreadCommand`
+ * and all of the sizes of the constants for the flavors, counts and state
+ * data structures.
+ *
+ * For executable objects that are unix processes there will be one
+ * `ThreadCommand` (cmd == LC_UNIXTHREAD) created for it by the link-editor.
+ * This is the same as a LC_THREAD, except that a stack is automatically
+ * created (based on the shell's limit for the stack size).  Command arguments
+ * and environment variables are copied onto that stack.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct ThreadCommand<E: Endian> {
+    /// LC_THREAD or  LC_UNIXTHREAD
+    pub cmd: U32<E>,
+    /// total size of this command
+    pub cmdsize: U32<E>,
+    /* uint32_t flavor		   flavor of thread state */
+    /* uint32_t count		   count of uint32_t's in thread state */
+    /* struct XXX_thread_state state   thread state for this flavor */
+    /* ... */
+}
+
+/*
+ * The routines command contains the address of the dynamic shared library
+ * initialization routine and an index into the module table for the module
+ * that defines the routine.  Before any modules are used from the library the
+ * dynamic linker fully binds the module that defines the initialization routine
+ * and then calls it.  This gets called before any module initialization
+ * routines (used for C++ static constructors) in the library.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct RoutinesCommand32<E: Endian> {
+    /* for 32-bit architectures */
+    /// LC_ROUTINES
+    pub cmd: U32<E>,
+    /// total size of this command
+    pub cmdsize: U32<E>,
+    /// address of initialization routine
+    pub init_address: U32<E>,
+    /// index into the module table that the init routine is defined in
+    pub init_module: U32<E>,
+    pub reserved1: U32<E>,
+    pub reserved2: U32<E>,
+    pub reserved3: U32<E>,
+    pub reserved4: U32<E>,
+    pub reserved5: U32<E>,
+    pub reserved6: U32<E>,
+}
+
+/*
+ * The 64-bit routines command.  Same use as above.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct RoutinesCommand64<E: Endian> {
+    /* for 64-bit architectures */
+    /// LC_ROUTINES_64
+    pub cmd: U32<E>,
+    /// total size of this command
+    pub cmdsize: U32<E>,
+    /// address of initialization routine
+    pub init_address: U64<E>,
+    /// index into the module table that the init routine is defined in
+    pub init_module: U64<E>,
+    pub reserved1: U64<E>,
+    pub reserved2: U64<E>,
+    pub reserved3: U64<E>,
+    pub reserved4: U64<E>,
+    pub reserved5: U64<E>,
+    pub reserved6: U64<E>,
+}
+
+/*
+ * The `SymtabCommand` contains the offsets and sizes of the link-edit 4.3BSD
+ * "stab" style symbol table information as described in the header files
+ * <nlist.h> and <stab.h>.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct SymtabCommand<E: Endian> {
+    /// LC_SYMTAB
+    pub cmd: U32<E>,
+    /// sizeof(struct SymtabCommand)
+    pub cmdsize: U32<E>,
+    /// symbol table offset
+    pub symoff: U32<E>,
+    /// number of symbol table entries
+    pub nsyms: U32<E>,
+    /// string table offset
+    pub stroff: U32<E>,
+    /// string table size in bytes
+    pub strsize: U32<E>,
+}
+
+/*
+ * This is the second set of the symbolic information which is used to support
+ * the data structures for the dynamically link editor.
+ *
+ * The original set of symbolic information in the `SymtabCommand` which contains
+ * the symbol and string tables must also be present when this load command is
+ * present.  When this load command is present the symbol table is organized
+ * into three groups of symbols:
+ *	local symbols (static and debugging symbols) - grouped by module
+ *	defined external symbols - grouped by module (sorted by name if not lib)
+ *	undefined external symbols (sorted by name if MH_BINDATLOAD is not set,
+ *	     			    and in order the were seen by the static
+ *				    linker if MH_BINDATLOAD is set)
+ * In this load command there are offsets and counts to each of the three groups
+ * of symbols.
+ *
+ * This load command contains a the offsets and sizes of the following new
+ * symbolic information tables:
+ *	table of contents
+ *	module table
+ *	reference symbol table
+ *	indirect symbol table
+ * The first three tables above (the table of contents, module table and
+ * reference symbol table) are only present if the file is a dynamically linked
+ * shared library.  For executable and object modules, which are files
+ * containing only one module, the information that would be in these three
+ * tables is determined as follows:
+ * 	table of contents - the defined external symbols are sorted by name
+ *	module table - the file contains only one module so everything in the
+ *		       file is part of the module.
+ *	reference symbol table - is the defined and undefined external symbols
+ *
+ * For dynamically linked shared library files this load command also contains
+ * offsets and sizes to the pool of relocation entries for all sections
+ * separated into two groups:
+ *	external relocation entries
+ *	local relocation entries
+ * For executable and object modules the relocation entries continue to hang
+ * off the section structures.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct DysymtabCommand<E: Endian> {
+    /// LC_DYSYMTAB
+    pub cmd: U32<E>,
+    /// sizeof(struct DysymtabCommand)
+    pub cmdsize: U32<E>,
+
+    /*
+     * The symbols indicated by symoff and nsyms of the LC_SYMTAB load command
+     * are grouped into the following three groups:
+     *    local symbols (further grouped by the module they are from)
+     *    defined external symbols (further grouped by the module they are from)
+     *    undefined symbols
+     *
+     * The local symbols are used only for debugging.  The dynamic binding
+     * process may have to use them to indicate to the debugger the local
+     * symbols for a module that is being bound.
+     *
+     * The last two groups are used by the dynamic binding process to do the
+     * binding (indirectly through the module table and the reference symbol
+     * table when this is a dynamically linked shared library file).
+     */
+    /// index to local symbols
+    pub ilocalsym: U32<E>,
+    /// number of local symbols
+    pub nlocalsym: U32<E>,
+
+    /// index to externally defined symbols
+    pub iextdefsym: U32<E>,
+    /// number of externally defined symbols
+    pub nextdefsym: U32<E>,
+
+    /// index to undefined symbols
+    pub iundefsym: U32<E>,
+    /// number of undefined symbols
+    pub nundefsym: U32<E>,
+
+    /*
+     * For the for the dynamic binding process to find which module a symbol
+     * is defined in the table of contents is used (analogous to the ranlib
+     * structure in an archive) which maps defined external symbols to modules
+     * they are defined in.  This exists only in a dynamically linked shared
+     * library file.  For executable and object modules the defined external
+     * symbols are sorted by name and is use as the table of contents.
+     */
+    /// file offset to table of contents
+    pub tocoff: U32<E>,
+    /// number of entries in table of contents
+    pub ntoc: U32<E>,
+
+    /*
+     * To support dynamic binding of "modules" (whole object files) the symbol
+     * table must reflect the modules that the file was created from.  This is
+     * done by having a module table that has indexes and counts into the merged
+     * tables for each module.  The module structure that these two entries
+     * refer to is described below.  This exists only in a dynamically linked
+     * shared library file.  For executable and object modules the file only
+     * contains one module so everything in the file belongs to the module.
+     */
+    /// file offset to module table
+    pub modtaboff: U32<E>,
+    /// number of module table entries
+    pub nmodtab: U32<E>,
+
+    /*
+     * To support dynamic module binding the module structure for each module
+     * indicates the external references (defined and undefined) each module
+     * makes.  For each module there is an offset and a count into the
+     * reference symbol table for the symbols that the module references.
+     * This exists only in a dynamically linked shared library file.  For
+     * executable and object modules the defined external symbols and the
+     * undefined external symbols indicates the external references.
+     */
+    /// offset to referenced symbol table
+    pub extrefsymoff: U32<E>,
+    /// number of referenced symbol table entries
+    pub nextrefsyms: U32<E>,
+
+    /*
+     * The sections that contain "symbol pointers" and "routine stubs" have
+     * indexes and (implied counts based on the size of the section and fixed
+     * size of the entry) into the "indirect symbol" table for each pointer
+     * and stub.  For every section of these two types the index into the
+     * indirect symbol table is stored in the section header in the field
+     * reserved1.  An indirect symbol table entry is simply a 32bit index into
+     * the symbol table to the symbol that the pointer or stub is referring to.
+     * The indirect symbol table is ordered to match the entries in the section.
+     */
+    /// file offset to the indirect symbol table
+    pub indirectsymoff: U32<E>,
+    /// number of indirect symbol table entries
+    pub nindirectsyms: U32<E>,
+
+    /*
+     * To support relocating an individual module in a library file quickly the
+     * external relocation entries for each module in the library need to be
+     * accessed efficiently.  Since the relocation entries can't be accessed
+     * through the section headers for a library file they are separated into
+     * groups of local and external entries further grouped by module.  In this
+     * case the presents of this load command who's extreloff, nextrel,
+     * locreloff and nlocrel fields are non-zero indicates that the relocation
+     * entries of non-merged sections are not referenced through the section
+     * structures (and the reloff and nreloc fields in the section headers are
+     * set to zero).
+     *
+     * Since the relocation entries are not accessed through the section headers
+     * this requires the r_address field to be something other than a section
+     * offset to identify the item to be relocated.  In this case r_address is
+     * set to the offset from the vmaddr of the first LC_SEGMENT command.
+     * For MH_SPLIT_SEGS images r_address is set to the the offset from the
+     * vmaddr of the first read-write LC_SEGMENT command.
+     *
+     * The relocation entries are grouped by module and the module table
+     * entries have indexes and counts into them for the group of external
+     * relocation entries for that the module.
+     *
+     * For sections that are merged across modules there must not be any
+     * remaining external relocation entries for them (for merged sections
+     * remaining relocation entries must be local).
+     */
+    /// offset to external relocation entries
+    pub extreloff: U32<E>,
+    /// number of external relocation entries
+    pub nextrel: U32<E>,
+
+    /*
+     * All the local relocation entries are grouped together (they are not
+     * grouped by their module since they are only used if the object is moved
+     * from it statically link edited address).
+     */
+    /// offset to local relocation entries
+    pub locreloff: U32<E>,
+    /// number of local relocation entries
+    pub nlocrel: U32<E>,
+}
+
+/*
+ * An indirect symbol table entry is simply a 32bit index into the symbol table
+ * to the symbol that the pointer or stub is referring to.  Unless it is for a
+ * non-lazy symbol pointer section for a defined symbol which strip(1) as
+ * removed.  In which case it has the value INDIRECT_SYMBOL_LOCAL.  If the
+ * symbol was also absolute INDIRECT_SYMBOL_ABS is or'ed with that.
+ */
+pub const INDIRECT_SYMBOL_LOCAL: u32 = 0x8000_0000;
+pub const INDIRECT_SYMBOL_ABS: u32 = 0x4000_0000;
+
+/* a table of contents entry */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct DylibTableOfContents<E: Endian> {
+    /// the defined external symbol (index into the symbol table)
+    pub symbol_index: U32<E>,
+    /// index into the module table this symbol is defined in
+    pub module_index: U32<E>,
+}
+
+/* a module table entry */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct DylibModule32<E: Endian> {
+    /// the module name (index into string table)
+    pub module_name: U32<E>,
+
+    /// index into externally defined symbols
+    pub iextdefsym: U32<E>,
+    /// number of externally defined symbols
+    pub nextdefsym: U32<E>,
+    /// index into reference symbol table
+    pub irefsym: U32<E>,
+    /// number of reference symbol table entries
+    pub nrefsym: U32<E>,
+    /// index into symbols for local symbols
+    pub ilocalsym: U32<E>,
+    /// number of local symbols
+    pub nlocalsym: U32<E>,
+
+    /// index into external relocation entries
+    pub iextrel: U32<E>,
+    /// number of external relocation entries
+    pub nextrel: U32<E>,
+
+    /// low 16 bits are the index into the init section, high 16 bits are the index into the term section
+    pub iinit_iterm: U32<E>,
+    /// low 16 bits are the number of init section entries, high 16 bits are the number of term section entries
+    pub ninit_nterm: U32<E>,
+
+    /// for this module address of the start of the (__OBJC,__module_info) section
+    pub objc_module_info_addr: U32<E>,
+    /// for this module size of the (__OBJC,__module_info) section
+    pub objc_module_info_size: U32<E>,
+}
+
+/* a 64-bit module table entry */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct DylibModule64<E: Endian> {
+    /// the module name (index into string table)
+    pub module_name: U32<E>,
+
+    /// index into externally defined symbols
+    pub iextdefsym: U32<E>,
+    /// number of externally defined symbols
+    pub nextdefsym: U32<E>,
+    /// index into reference symbol table
+    pub irefsym: U32<E>,
+    /// number of reference symbol table entries
+    pub nrefsym: U32<E>,
+    /// index into symbols for local symbols
+    pub ilocalsym: U32<E>,
+    /// number of local symbols
+    pub nlocalsym: U32<E>,
+
+    /// index into external relocation entries
+    pub iextrel: U32<E>,
+    /// number of external relocation entries
+    pub nextrel: U32<E>,
+
+    /// low 16 bits are the index into the init section, high 16 bits are the index into the term section
+    pub iinit_iterm: U32<E>,
+    /// low 16 bits are the number of init section entries, high 16 bits are the number of term section entries
+    pub ninit_nterm: U32<E>,
+
+    /// for this module size of the (__OBJC,__module_info) section
+    pub objc_module_info_size: U32<E>,
+    /// for this module address of the start of the (__OBJC,__module_info) section
+    pub objc_module_info_addr: U64<E>,
+}
+
+/*
+ * The entries in the reference symbol table are used when loading the module
+ * (both by the static and dynamic link editors) and if the module is unloaded
+ * or replaced.  Therefore all external symbols (defined and undefined) are
+ * listed in the module's reference table.  The flags describe the type of
+ * reference that is being made.  The constants for the flags are defined in
+ * <mach-o/nlist.h> as they are also used for symbol table entries.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct DylibReference<E: Endian> {
+    /* TODO:
+    uint32_t isym:24,		/* index into the symbol table */
+              flags:8;	/* flags to indicate the type of reference */
+    */
+    pub bitfield: U32<E>,
+}
+
+/*
+ * The TwolevelHintsCommand contains the offset and number of hints in the
+ * two-level namespace lookup hints table.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct TwolevelHintsCommand<E: Endian> {
+    /// LC_TWOLEVEL_HINTS
+    pub cmd: U32<E>,
+    /// sizeof(struct TwolevelHintsCommand)
+    pub cmdsize: U32<E>,
+    /// offset to the hint table
+    pub offset: U32<E>,
+    /// number of hints in the hint table
+    pub nhints: U32<E>,
+}
+
+/*
+ * The entries in the two-level namespace lookup hints table are TwolevelHint
+ * structs.  These provide hints to the dynamic link editor where to start
+ * looking for an undefined symbol in a two-level namespace image.  The
+ * isub_image field is an index into the sub-images (sub-frameworks and
+ * sub-umbrellas list) that made up the two-level image that the undefined
+ * symbol was found in when it was built by the static link editor.  If
+ * isub-image is 0 the the symbol is expected to be defined in library and not
+ * in the sub-images.  If isub-image is non-zero it is an index into the array
+ * of sub-images for the umbrella with the first index in the sub-images being
+ * 1. The array of sub-images is the ordered list of sub-images of the umbrella
+ * that would be searched for a symbol that has the umbrella recorded as its
+ * primary library.  The table of contents index is an index into the
+ * library's table of contents.  This is used as the starting point of the
+ * binary search or a directed linear search.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct TwolevelHint<E: Endian> {
+    /* TODO:
+    uint32_t
+    isub_image:8,	/* index into the sub images */
+    itoc:24;	/* index into the table of contents */
+    */
+    pub bitfield: U32<E>,
+}
+
+/*
+ * The PrebindCksumCommand contains the value of the original check sum for
+ * prebound files or zero.  When a prebound file is first created or modified
+ * for other than updating its prebinding information the value of the check sum
+ * is set to zero.  When the file has it prebinding re-done and if the value of
+ * the check sum is zero the original check sum is calculated and stored in
+ * cksum field of this load command in the output file.  If when the prebinding
+ * is re-done and the cksum field is non-zero it is left unchanged from the
+ * input file.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct PrebindCksumCommand<E: Endian> {
+    /// LC_PREBIND_CKSUM
+    pub cmd: U32<E>,
+    /// sizeof(struct PrebindCksumCommand)
+    pub cmdsize: U32<E>,
+    /// the check sum or zero
+    pub cksum: U32<E>,
+}
+
+/*
+ * The uuid load command contains a single 128-bit unique random number that
+ * identifies an object produced by the static link editor.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct UuidCommand<E: Endian> {
+    /// LC_UUID
+    pub cmd: U32<E>,
+    /// sizeof(struct UuidCommand)
+    pub cmdsize: U32<E>,
+    /// the 128-bit uuid
+    pub uuid: [u8; 16],
+}
+
+/*
+ * The RpathCommand contains a path which at runtime should be added to
+ * the current run path used to find @rpath prefixed dylibs.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct RpathCommand<E: Endian> {
+    /// LC_RPATH
+    pub cmd: U32<E>,
+    /// includes string
+    pub cmdsize: U32<E>,
+    /// path to add to run path
+    pub path: LcStr<E>,
+}
+
+/*
+ * The LinkeditDataCommand contains the offsets and sizes of a blob
+ * of data in the __LINKEDIT segment.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct LinkeditDataCommand<E: Endian> {
+    /// `LC_CODE_SIGNATURE`, `LC_SEGMENT_SPLIT_INFO`, `LC_FUNCTION_STARTS`,
+    /// `LC_DATA_IN_CODE`, `LC_DYLIB_CODE_SIGN_DRS`, `LC_LINKER_OPTIMIZATION_HINT`,
+    /// `LC_DYLD_EXPORTS_TRIE`, or `LC_DYLD_CHAINED_FIXUPS`.
+    pub cmd: U32<E>,
+    /// sizeof(struct LinkeditDataCommand)
+    pub cmdsize: U32<E>,
+    /// file offset of data in __LINKEDIT segment
+    pub dataoff: U32<E>,
+    /// file size of data in __LINKEDIT segment
+    pub datasize: U32<E>,
+}
+
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct FilesetEntryCommand<E: Endian> {
+    // LC_FILESET_ENTRY
+    pub cmd: U32<E>,
+    /// includes id string
+    pub cmdsize: U32<E>,
+    /// memory address of the dylib
+    pub vmaddr: U64<E>,
+    /// file offset of the dylib
+    pub fileoff: U64<E>,
+    /// contained entry id
+    pub entry_id: LcStr<E>,
+    /// entry_id is 32-bits long, so this is the reserved padding
+    pub reserved: U32<E>,
+}
+
+/*
+ * The EncryptionInfoCommand32 contains the file offset and size of an
+ * of an encrypted segment.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct EncryptionInfoCommand32<E: Endian> {
+    /// LC_ENCRYPTION_INFO
+    pub cmd: U32<E>,
+    /// sizeof(struct EncryptionInfoCommand32)
+    pub cmdsize: U32<E>,
+    /// file offset of encrypted range
+    pub cryptoff: U32<E>,
+    /// file size of encrypted range
+    pub cryptsize: U32<E>,
+    /// which enryption system, 0 means not-encrypted yet
+    pub cryptid: U32<E>,
+}
+
+/*
+ * The EncryptionInfoCommand64 contains the file offset and size of an
+ * of an encrypted segment (for use in x86_64 targets).
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct EncryptionInfoCommand64<E: Endian> {
+    /// LC_ENCRYPTION_INFO_64
+    pub cmd: U32<E>,
+    /// sizeof(struct EncryptionInfoCommand64)
+    pub cmdsize: U32<E>,
+    /// file offset of encrypted range
+    pub cryptoff: U32<E>,
+    /// file size of encrypted range
+    pub cryptsize: U32<E>,
+    /// which enryption system, 0 means not-encrypted yet
+    pub cryptid: U32<E>,
+    /// padding to make this struct's size a multiple of 8 bytes
+    pub pad: U32<E>,
+}
+
+/*
+ * The VersionMinCommand contains the min OS version on which this
+ * binary was built to run.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct VersionMinCommand<E: Endian> {
+    /// LC_VERSION_MIN_MACOSX or LC_VERSION_MIN_IPHONEOS or LC_VERSION_MIN_WATCHOS or LC_VERSION_MIN_TVOS
+    pub cmd: U32<E>,
+    /// sizeof(struct VersionMinCommand)
+    pub cmdsize: U32<E>,
+    /// X.Y.Z is encoded in nibbles xxxx.yy.zz
+    pub version: U32<E>,
+    /// X.Y.Z is encoded in nibbles xxxx.yy.zz
+    pub sdk: U32<E>,
+}
+
+/*
+ * The BuildVersionCommand contains the min OS version on which this
+ * binary was built to run for its platform.  The list of known platforms and
+ * tool values following it.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct BuildVersionCommand<E: Endian> {
+    /// LC_BUILD_VERSION
+    pub cmd: U32<E>,
+    /// sizeof(struct BuildVersionCommand) plus ntools * sizeof(struct BuildToolVersion)
+    pub cmdsize: U32<E>,
+    /// platform
+    pub platform: U32<E>,
+    /// X.Y.Z is encoded in nibbles xxxx.yy.zz
+    pub minos: U32<E>,
+    /// X.Y.Z is encoded in nibbles xxxx.yy.zz
+    pub sdk: U32<E>,
+    /// number of tool entries following this
+    pub ntools: U32<E>,
+}
+
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct BuildToolVersion<E: Endian> {
+    /// enum for the tool
+    pub tool: U32<E>,
+    /// version number of the tool
+    pub version: U32<E>,
+}
+
+/* Known values for the platform field above. */
+pub const PLATFORM_MACOS: u32 = 1;
+pub const PLATFORM_IOS: u32 = 2;
+pub const PLATFORM_TVOS: u32 = 3;
+pub const PLATFORM_WATCHOS: u32 = 4;
+pub const PLATFORM_BRIDGEOS: u32 = 5;
+pub const PLATFORM_MACCATALYST: u32 = 6;
+pub const PLATFORM_IOSSIMULATOR: u32 = 7;
+pub const PLATFORM_TVOSSIMULATOR: u32 = 8;
+pub const PLATFORM_WATCHOSSIMULATOR: u32 = 9;
+pub const PLATFORM_DRIVERKIT: u32 = 10;
+
+/* Known values for the tool field above. */
+pub const TOOL_CLANG: u32 = 1;
+pub const TOOL_SWIFT: u32 = 2;
+pub const TOOL_LD: u32 = 3;
+
+/*
+ * The DyldInfoCommand contains the file offsets and sizes of
+ * the new compressed form of the information dyld needs to
+ * load the image.  This information is used by dyld on Mac OS X
+ * 10.6 and later.  All information pointed to by this command
+ * is encoded using byte streams, so no endian swapping is needed
+ * to interpret it.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct DyldInfoCommand<E: Endian> {
+    /// LC_DYLD_INFO or LC_DYLD_INFO_ONLY
+    pub cmd: U32<E>,
+    /// sizeof(struct DyldInfoCommand)
+    pub cmdsize: U32<E>,
+
+    /*
+     * Dyld rebases an image whenever dyld loads it at an address different
+     * from its preferred address.  The rebase information is a stream
+     * of byte sized opcodes whose symbolic names start with REBASE_OPCODE_.
+     * Conceptually the rebase information is a table of tuples:
+     *    <seg-index, seg-offset, type>
+     * The opcodes are a compressed way to encode the table by only
+     * encoding when a column changes.  In addition simple patterns
+     * like "every n'th offset for m times" can be encoded in a few
+     * bytes.
+     */
+    /// file offset to rebase info
+    pub rebase_off: U32<E>,
+    /// size of rebase info
+    pub rebase_size: U32<E>,
+
+    /*
+     * Dyld binds an image during the loading process, if the image
+     * requires any pointers to be initialized to symbols in other images.
+     * The bind information is a stream of byte sized
+     * opcodes whose symbolic names start with BIND_OPCODE_.
+     * Conceptually the bind information is a table of tuples:
+     *    <seg-index, seg-offset, type, symbol-library-ordinal, symbol-name, addend>
+     * The opcodes are a compressed way to encode the table by only
+     * encoding when a column changes.  In addition simple patterns
+     * like for runs of pointers initialized to the same value can be
+     * encoded in a few bytes.
+     */
+    /// file offset to binding info
+    pub bind_off: U32<E>,
+    /// size of binding info
+    pub bind_size: U32<E>,
+
+    /*
+     * Some C++ programs require dyld to unique symbols so that all
+     * images in the process use the same copy of some code/data.
+     * This step is done after binding. The content of the weak_bind
+     * info is an opcode stream like the bind_info.  But it is sorted
+     * alphabetically by symbol name.  This enable dyld to walk
+     * all images with weak binding information in order and look
+     * for collisions.  If there are no collisions, dyld does
+     * no updating.  That means that some fixups are also encoded
+     * in the bind_info.  For instance, all calls to "operator new"
+     * are first bound to libstdc++.dylib using the information
+     * in bind_info.  Then if some image overrides operator new
+     * that is detected when the weak_bind information is processed
+     * and the call to operator new is then rebound.
+     */
+    /// file offset to weak binding info
+    pub weak_bind_off: U32<E>,
+    /// size of weak binding info
+    pub weak_bind_size: U32<E>,
+
+    /*
+     * Some uses of external symbols do not need to be bound immediately.
+     * Instead they can be lazily bound on first use.  The lazy_bind
+     * are contains a stream of BIND opcodes to bind all lazy symbols.
+     * Normal use is that dyld ignores the lazy_bind section when
+     * loading an image.  Instead the static linker arranged for the
+     * lazy pointer to initially point to a helper function which
+     * pushes the offset into the lazy_bind area for the symbol
+     * needing to be bound, then jumps to dyld which simply adds
+     * the offset to lazy_bind_off to get the information on what
+     * to bind.
+     */
+    /// file offset to lazy binding info
+    pub lazy_bind_off: U32<E>,
+    /// size of lazy binding infs
+    pub lazy_bind_size: U32<E>,
+
+    /*
+     * The symbols exported by a dylib are encoded in a trie.  This
+     * is a compact representation that factors out common prefixes.
+     * It also reduces LINKEDIT pages in RAM because it encodes all
+     * information (name, address, flags) in one small, contiguous range.
+     * The export area is a stream of nodes.  The first node sequentially
+     * is the start node for the trie.
+     *
+     * Nodes for a symbol start with a uleb128 that is the length of
+     * the exported symbol information for the string so far.
+     * If there is no exported symbol, the node starts with a zero byte.
+     * If there is exported info, it follows the length.
+     *
+     * First is a uleb128 containing flags. Normally, it is followed by
+     * a uleb128 encoded offset which is location of the content named
+     * by the symbol from the mach_header for the image.  If the flags
+     * is EXPORT_SYMBOL_FLAGS_REEXPORT, then following the flags is
+     * a uleb128 encoded library ordinal, then a zero terminated
+     * UTF8 string.  If the string is zero length, then the symbol
+     * is re-export from the specified dylib with the same name.
+     * If the flags is EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER, then following
+     * the flags is two uleb128s: the stub offset and the resolver offset.
+     * The stub is used by non-lazy pointers.  The resolver is used
+     * by lazy pointers and must be called to get the actual address to use.
+     *
+     * After the optional exported symbol information is a byte of
+     * how many edges (0-255) that this node has leaving it,
+     * followed by each edge.
+     * Each edge is a zero terminated UTF8 of the addition chars
+     * in the symbol, followed by a uleb128 offset for the node that
+     * edge points to.
+     *
+     */
+    /// file offset to lazy binding info
+    pub export_off: U32<E>,
+    /// size of lazy binding infs
+    pub export_size: U32<E>,
+}
+
+/*
+ * The following are used to encode rebasing information
+ */
+pub const REBASE_TYPE_POINTER: u8 = 1;
+pub const REBASE_TYPE_TEXT_ABSOLUTE32: u8 = 2;
+pub const REBASE_TYPE_TEXT_PCREL32: u8 = 3;
+
+pub const REBASE_OPCODE_MASK: u8 = 0xF0;
+pub const REBASE_IMMEDIATE_MASK: u8 = 0x0F;
+pub const REBASE_OPCODE_DONE: u8 = 0x00;
+pub const REBASE_OPCODE_SET_TYPE_IMM: u8 = 0x10;
+pub const REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: u8 = 0x20;
+pub const REBASE_OPCODE_ADD_ADDR_ULEB: u8 = 0x30;
+pub const REBASE_OPCODE_ADD_ADDR_IMM_SCALED: u8 = 0x40;
+pub const REBASE_OPCODE_DO_REBASE_IMM_TIMES: u8 = 0x50;
+pub const REBASE_OPCODE_DO_REBASE_ULEB_TIMES: u8 = 0x60;
+pub const REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB: u8 = 0x70;
+pub const REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB: u8 = 0x80;
+
+/*
+ * The following are used to encode binding information
+ */
+pub const BIND_TYPE_POINTER: u8 = 1;
+pub const BIND_TYPE_TEXT_ABSOLUTE32: u8 = 2;
+pub const BIND_TYPE_TEXT_PCREL32: u8 = 3;
+
+pub const BIND_SPECIAL_DYLIB_SELF: i8 = 0;
+pub const BIND_SPECIAL_DYLIB_MAIN_EXECUTABLE: i8 = -1;
+pub const BIND_SPECIAL_DYLIB_FLAT_LOOKUP: i8 = -2;
+pub const BIND_SPECIAL_DYLIB_WEAK_LOOKUP: i8 = -3;
+
+pub const BIND_SYMBOL_FLAGS_WEAK_IMPORT: u8 = 0x1;
+pub const BIND_SYMBOL_FLAGS_NON_WEAK_DEFINITION: u8 = 0x8;
+
+pub const BIND_OPCODE_MASK: u8 = 0xF0;
+pub const BIND_IMMEDIATE_MASK: u8 = 0x0F;
+pub const BIND_OPCODE_DONE: u8 = 0x00;
+pub const BIND_OPCODE_SET_DYLIB_ORDINAL_IMM: u8 = 0x10;
+pub const BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB: u8 = 0x20;
+pub const BIND_OPCODE_SET_DYLIB_SPECIAL_IMM: u8 = 0x30;
+pub const BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM: u8 = 0x40;
+pub const BIND_OPCODE_SET_TYPE_IMM: u8 = 0x50;
+pub const BIND_OPCODE_SET_ADDEND_SLEB: u8 = 0x60;
+pub const BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: u8 = 0x70;
+pub const BIND_OPCODE_ADD_ADDR_ULEB: u8 = 0x80;
+pub const BIND_OPCODE_DO_BIND: u8 = 0x90;
+pub const BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB: u8 = 0xA0;
+pub const BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED: u8 = 0xB0;
+pub const BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB: u8 = 0xC0;
+pub const BIND_OPCODE_THREADED: u8 = 0xD0;
+pub const BIND_SUBOPCODE_THREADED_SET_BIND_ORDINAL_TABLE_SIZE_ULEB: u8 = 0x00;
+pub const BIND_SUBOPCODE_THREADED_APPLY: u8 = 0x01;
+
+/*
+ * The following are used on the flags byte of a terminal node
+ * in the export information.
+ */
+pub const EXPORT_SYMBOL_FLAGS_KIND_MASK: u32 = 0x03;
+pub const EXPORT_SYMBOL_FLAGS_KIND_REGULAR: u32 = 0x00;
+pub const EXPORT_SYMBOL_FLAGS_KIND_THREAD_LOCAL: u32 = 0x01;
+pub const EXPORT_SYMBOL_FLAGS_KIND_ABSOLUTE: u32 = 0x02;
+pub const EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION: u32 = 0x04;
+pub const EXPORT_SYMBOL_FLAGS_REEXPORT: u32 = 0x08;
+pub const EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER: u32 = 0x10;
+
+/*
+ * The LinkerOptionCommand contains linker options embedded in object files.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct LinkerOptionCommand<E: Endian> {
+    /// LC_LINKER_OPTION only used in MH_OBJECT filetypes
+    pub cmd: U32<E>,
+    pub cmdsize: U32<E>,
+    /// number of strings
+    pub count: U32<E>,
+    /* concatenation of zero terminated UTF8 strings.
+    Zero filled at end to align */
+}
+
+/*
+ * The SymsegCommand contains the offset and size of the GNU style
+ * symbol table information as described in the header file <symseg.h>.
+ * The symbol roots of the symbol segments must also be aligned properly
+ * in the file.  So the requirement of keeping the offsets aligned to a
+ * multiple of a 4 bytes translates to the length field of the symbol
+ * roots also being a multiple of a long.  Also the padding must again be
+ * zeroed. (THIS IS OBSOLETE and no longer supported).
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct SymsegCommand<E: Endian> {
+    /// LC_SYMSEG
+    pub cmd: U32<E>,
+    /// sizeof(struct SymsegCommand)
+    pub cmdsize: U32<E>,
+    /// symbol segment offset
+    pub offset: U32<E>,
+    /// symbol segment size in bytes
+    pub size: U32<E>,
+}
+
+/*
+ * The IdentCommand contains a free format string table following the
+ * IdentCommand structure.  The strings are null terminated and the size of
+ * the command is padded out with zero bytes to a multiple of 4 bytes/
+ * (THIS IS OBSOLETE and no longer supported).
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct IdentCommand<E: Endian> {
+    /// LC_IDENT
+    pub cmd: U32<E>,
+    /// strings that follow this command
+    pub cmdsize: U32<E>,
+}
+
+/*
+ * The FvmfileCommand contains a reference to a file to be loaded at the
+ * specified virtual address.  (Presently, this command is reserved for
+ * internal use.  The kernel ignores this command when loading a program into
+ * memory).
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct FvmfileCommand<E: Endian> {
+    /// LC_FVMFILE
+    pub cmd: U32<E>,
+    /// includes pathname string
+    pub cmdsize: U32<E>,
+    /// files pathname
+    pub name: LcStr<E>,
+    /// files virtual address
+    pub header_addr: U32<E>,
+}
+
+/*
+ * The EntryPointCommand is a replacement for thread_command.
+ * It is used for main executables to specify the location (file offset)
+ * of main().  If -stack_size was used at link time, the stacksize
+ * field will contain the stack size need for the main thread.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct EntryPointCommand<E: Endian> {
+    /// LC_MAIN only used in MH_EXECUTE filetypes
+    pub cmd: U32<E>,
+    /// 24
+    pub cmdsize: U32<E>,
+    /// file (__TEXT) offset of main()
+    pub entryoff: U64<E>,
+    /// if not zero, initial stack size
+    pub stacksize: U64<E>,
+}
+
+/*
+ * The SourceVersionCommand is an optional load command containing
+ * the version of the sources used to build the binary.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct SourceVersionCommand<E: Endian> {
+    /// LC_SOURCE_VERSION
+    pub cmd: U32<E>,
+    /// 16
+    pub cmdsize: U32<E>,
+    /// A.B.C.D.E packed as a24.b10.c10.d10.e10
+    pub version: U64<E>,
+}
+
+/*
+ * The LC_DATA_IN_CODE load commands uses a LinkeditDataCommand
+ * to point to an array of DataInCodeEntry entries. Each entry
+ * describes a range of data in a code section.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct DataInCodeEntry<E: Endian> {
+    /// from mach_header to start of data range
+    pub offset: U32<E>,
+    /// number of bytes in data range
+    pub length: U16<E>,
+    /// a DICE_KIND_* value
+    pub kind: U16<E>,
+}
+pub const DICE_KIND_DATA: u32 = 0x0001;
+pub const DICE_KIND_JUMP_TABLE8: u32 = 0x0002;
+pub const DICE_KIND_JUMP_TABLE16: u32 = 0x0003;
+pub const DICE_KIND_JUMP_TABLE32: u32 = 0x0004;
+pub const DICE_KIND_ABS_JUMP_TABLE32: u32 = 0x0005;
+
+/*
+ * Sections of type S_THREAD_LOCAL_VARIABLES contain an array
+ * of TlvDescriptor structures.
+ */
+/* TODO:
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct TlvDescriptor<E: Endian>
+{
+    void*		(*thunk)(struct TlvDescriptor*);
+    unsigned long	key;
+    unsigned long	offset;
+}
+*/
+
+/*
+ * LC_NOTE commands describe a region of arbitrary data included in a Mach-O
+ * file.  Its initial use is to record extra data in MH_CORE files.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct NoteCommand<E: Endian> {
+    /// LC_NOTE
+    pub cmd: U32<E>,
+    /// sizeof(struct NoteCommand)
+    pub cmdsize: U32<E>,
+    /// owner name for this LC_NOTE
+    pub data_owner: [u8; 16],
+    /// file offset of this data
+    pub offset: U64<E>,
+    /// length of data region
+    pub size: U64<E>,
+}
+
+// Definitions from "/usr/include/mach-o/nlist.h".
+
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct Nlist32<E: Endian> {
+    /// index into the string table
+    pub n_strx: U32<E>,
+    /// type flag, see below
+    pub n_type: u8,
+    /// section number or NO_SECT
+    pub n_sect: u8,
+    /// see <mach-o/stab.h>
+    pub n_desc: U16<E>,
+    /// value of this symbol (or stab offset)
+    pub n_value: U32<E>,
+}
+
+/*
+ * This is the symbol table entry structure for 64-bit architectures.
+ */
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct Nlist64<E: Endian> {
+    /// index into the string table
+    pub n_strx: U32<E>,
+    /// type flag, see below
+    pub n_type: u8,
+    /// section number or NO_SECT
+    pub n_sect: u8,
+    /// see <mach-o/stab.h>
+    pub n_desc: U16<E>,
+    /// value of this symbol (or stab offset)
+    // Note: 4 byte alignment has been observed in practice.
+    pub n_value: U64Bytes<E>,
+}
+
+/*
+ * Symbols with a index into the string table of zero (n_un.n_strx == 0) are
+ * defined to have a null, "", name.  Therefore all string indexes to non null
+ * names must not have a zero string index.  This is bit historical information
+ * that has never been well documented.
+ */
+
+/*
+ * The n_type field really contains four fields:
+ *	unsigned char N_STAB:3,
+ *		      N_PEXT:1,
+ *		      N_TYPE:3,
+ *		      N_EXT:1;
+ * which are used via the following masks.
+ */
+/// if any of these bits set, a symbolic debugging entry
+pub const N_STAB: u8 = 0xe0;
+/// private external symbol bit
+pub const N_PEXT: u8 = 0x10;
+/// mask for the type bits
+pub const N_TYPE: u8 = 0x0e;
+/// external symbol bit, set for external symbols
+pub const N_EXT: u8 = 0x01;
+
+/*
+ * Only symbolic debugging entries have some of the N_STAB bits set and if any
+ * of these bits are set then it is a symbolic debugging entry (a stab).  In
+ * which case then the values of the n_type field (the entire field) are given
+ * in <mach-o/stab.h>
+ */
+
+/*
+ * Values for N_TYPE bits of the n_type field.
+ */
+/// undefined, n_sect == NO_SECT
+pub const N_UNDF: u8 = 0x0;
+/// absolute, n_sect == NO_SECT
+pub const N_ABS: u8 = 0x2;
+/// defined in section number n_sect
+pub const N_SECT: u8 = 0xe;
+/// prebound undefined (defined in a dylib)
+pub const N_PBUD: u8 = 0xc;
+/// indirect
+pub const N_INDR: u8 = 0xa;
+
+/*
+ * If the type is N_INDR then the symbol is defined to be the same as another
+ * symbol.  In this case the n_value field is an index into the string table
+ * of the other symbol's name.  When the other symbol is defined then they both
+ * take on the defined type and value.
+ */
+
+/*
+ * If the type is N_SECT then the n_sect field contains an ordinal of the
+ * section the symbol is defined in.  The sections are numbered from 1 and
+ * refer to sections in order they appear in the load commands for the file
+ * they are in.  This means the same ordinal may very well refer to different
+ * sections in different files.
+ *
+ * The n_value field for all symbol table entries (including N_STAB's) gets
+ * updated by the link editor based on the value of it's n_sect field and where
+ * the section n_sect references gets relocated.  If the value of the n_sect
+ * field is NO_SECT then it's n_value field is not changed by the link editor.
+ */
+/// symbol is not in any section
+pub const NO_SECT: u8 = 0;
+/// 1 thru 255 inclusive
+pub const MAX_SECT: u8 = 255;
+
+/*
+ * Common symbols are represented by undefined (N_UNDF) external (N_EXT) types
+ * who's values (n_value) are non-zero.  In which case the value of the n_value
+ * field is the size (in bytes) of the common symbol.  The n_sect field is set
+ * to NO_SECT.  The alignment of a common symbol may be set as a power of 2
+ * between 2^1 and 2^15 as part of the n_desc field using the macros below. If
+ * the alignment is not set (a value of zero) then natural alignment based on
+ * the size is used.
+ */
+/* TODO:
+#define GET_COMM_ALIGN(n_desc) (((n_desc) >> 8) & 0x0f)
+#define SET_COMM_ALIGN(n_desc,align) \
+    (n_desc) = (((n_desc) & 0xf0ff) | (((align) & 0x0f) << 8))
+ */
+
+/*
+ * To support the lazy binding of undefined symbols in the dynamic link-editor,
+ * the undefined symbols in the symbol table (the nlist structures) are marked
+ * with the indication if the undefined reference is a lazy reference or
+ * non-lazy reference.  If both a non-lazy reference and a lazy reference is
+ * made to the same symbol the non-lazy reference takes precedence.  A reference
+ * is lazy only when all references to that symbol are made through a symbol
+ * pointer in a lazy symbol pointer section.
+ *
+ * The implementation of marking nlist structures in the symbol table for
+ * undefined symbols will be to use some of the bits of the n_desc field as a
+ * reference type.  The mask REFERENCE_TYPE will be applied to the n_desc field
+ * of an nlist structure for an undefined symbol to determine the type of
+ * undefined reference (lazy or non-lazy).
+ *
+ * The constants for the REFERENCE FLAGS are propagated to the reference table
+ * in a shared library file.  In that case the constant for a defined symbol,
+ * REFERENCE_FLAG_DEFINED, is also used.
+ */
+/* Reference type bits of the n_desc field of undefined symbols */
+pub const REFERENCE_TYPE: u16 = 0x7;
+/* types of references */
+pub const REFERENCE_FLAG_UNDEFINED_NON_LAZY: u16 = 0;
+pub const REFERENCE_FLAG_UNDEFINED_LAZY: u16 = 1;
+pub const REFERENCE_FLAG_DEFINED: u16 = 2;
+pub const REFERENCE_FLAG_PRIVATE_DEFINED: u16 = 3;
+pub const REFERENCE_FLAG_PRIVATE_UNDEFINED_NON_LAZY: u16 = 4;
+pub const REFERENCE_FLAG_PRIVATE_UNDEFINED_LAZY: u16 = 5;
+
+/*
+ * To simplify stripping of objects that use are used with the dynamic link
+ * editor, the static link editor marks the symbols defined an object that are
+ * referenced by a dynamically bound object (dynamic shared libraries, bundles).
+ * With this marking strip knows not to strip these symbols.
+ */
+pub const REFERENCED_DYNAMICALLY: u16 = 0x0010;
+
+/*
+ * For images created by the static link editor with the -twolevel_namespace
+ * option in effect the flags field of the mach header is marked with
+ * MH_TWOLEVEL.  And the binding of the undefined references of the image are
+ * determined by the static link editor.  Which library an undefined symbol is
+ * bound to is recorded by the static linker in the high 8 bits of the n_desc
+ * field using the SET_LIBRARY_ORDINAL macro below.  The ordinal recorded
+ * references the libraries listed in the Mach-O's LC_LOAD_DYLIB,
+ * LC_LOAD_WEAK_DYLIB, LC_REEXPORT_DYLIB, LC_LOAD_UPWARD_DYLIB, and
+ * LC_LAZY_LOAD_DYLIB, etc. load commands in the order they appear in the
+ * headers.   The library ordinals start from 1.
+ * For a dynamic library that is built as a two-level namespace image the
+ * undefined references from module defined in another use the same nlist struct
+ * an in that case SELF_LIBRARY_ORDINAL is used as the library ordinal.  For
+ * defined symbols in all images they also must have the library ordinal set to
+ * SELF_LIBRARY_ORDINAL.  The EXECUTABLE_ORDINAL refers to the executable
+ * image for references from plugins that refer to the executable that loads
+ * them.
+ *
+ * The DYNAMIC_LOOKUP_ORDINAL is for undefined symbols in a two-level namespace
+ * image that are looked up by the dynamic linker with flat namespace semantics.
+ * This ordinal was added as a feature in Mac OS X 10.3 by reducing the
+ * value of MAX_LIBRARY_ORDINAL by one.  So it is legal for existing binaries
+ * or binaries built with older tools to have 0xfe (254) dynamic libraries.  In
+ * this case the ordinal value 0xfe (254) must be treated as a library ordinal
+ * for compatibility.
+ */
+/* TODO:
+#define GET_LIBRARY_ORDINAL(n_desc) (((n_desc) >> 8) & 0xff)
+#define SET_LIBRARY_ORDINAL(n_desc,ordinal) \
+    (n_desc) = (((n_desc) & 0x00ff) | (((ordinal) & 0xff) << 8))
+ */
+pub const SELF_LIBRARY_ORDINAL: u8 = 0x0;
+pub const MAX_LIBRARY_ORDINAL: u8 = 0xfd;
+pub const DYNAMIC_LOOKUP_ORDINAL: u8 = 0xfe;
+pub const EXECUTABLE_ORDINAL: u8 = 0xff;
+
+/*
+ * The bit 0x0020 of the n_desc field is used for two non-overlapping purposes
+ * and has two different symbolic names, N_NO_DEAD_STRIP and N_DESC_DISCARDED.
+ */
+
+/*
+ * The N_NO_DEAD_STRIP bit of the n_desc field only ever appears in a
+ * relocatable .o file (MH_OBJECT filetype). And is used to indicate to the
+ * static link editor it is never to dead strip the symbol.
+ */
+/// symbol is not to be dead stripped
+pub const N_NO_DEAD_STRIP: u16 = 0x0020;
+
+/*
+ * The N_DESC_DISCARDED bit of the n_desc field never appears in linked image.
+ * But is used in very rare cases by the dynamic link editor to mark an in
+ * memory symbol as discared and longer used for linking.
+ */
+/// symbol is discarded
+pub const N_DESC_DISCARDED: u16 = 0x0020;
+
+/*
+ * The N_WEAK_REF bit of the n_desc field indicates to the dynamic linker that
+ * the undefined symbol is allowed to be missing and is to have the address of
+ * zero when missing.
+ */
+/// symbol is weak referenced
+pub const N_WEAK_REF: u16 = 0x0040;
+
+/*
+ * The N_WEAK_DEF bit of the n_desc field indicates to the static and dynamic
+ * linkers that the symbol definition is weak, allowing a non-weak symbol to
+ * also be used which causes the weak definition to be discared.  Currently this
+ * is only supported for symbols in coalesced sections.
+ */
+/// coalesced symbol is a weak definition
+pub const N_WEAK_DEF: u16 = 0x0080;
+
+/*
+ * The N_REF_TO_WEAK bit of the n_desc field indicates to the dynamic linker
+ * that the undefined symbol should be resolved using flat namespace searching.
+ */
+/// reference to a weak symbol
+pub const N_REF_TO_WEAK: u16 = 0x0080;
+
+/*
+ * The N_ARM_THUMB_DEF bit of the n_desc field indicates that the symbol is
+ * a definition of a Thumb function.
+ */
+/// symbol is a Thumb function (ARM)
+pub const N_ARM_THUMB_DEF: u16 = 0x0008;
+
+/*
+ * The N_SYMBOL_RESOLVER bit of the n_desc field indicates that the
+ * that the function is actually a resolver function and should
+ * be called to get the address of the real function to use.
+ * This bit is only available in .o files (MH_OBJECT filetype)
+ */
+pub const N_SYMBOL_RESOLVER: u16 = 0x0100;
+
+/*
+ * The N_ALT_ENTRY bit of the n_desc field indicates that the
+ * symbol is pinned to the previous content.
+ */
+pub const N_ALT_ENTRY: u16 = 0x0200;
+
+// Definitions from "/usr/include/mach-o/stab.h".
+
+/*
+ * This file gives definitions supplementing <nlist.h> for permanent symbol
+ * table entries of Mach-O files.  Modified from the BSD definitions.  The
+ * modifications from the original definitions were changing what the values of
+ * what was the n_other field (an unused field) which is now the n_sect field.
+ * These modifications are required to support symbols in an arbitrary number of
+ * sections not just the three sections (text, data and bss) in a BSD file.
+ * The values of the defined constants have NOT been changed.
+ *
+ * These must have one of the N_STAB bits on.  The n_value fields are subject
+ * to relocation according to the value of their n_sect field.  So for types
+ * that refer to things in sections the n_sect field must be filled in with the
+ * proper section ordinal.  For types that are not to have their n_value field
+ * relocatated the n_sect field must be NO_SECT.
+ */
+
+/*
+ * Symbolic debugger symbols.  The comments give the conventional use for
+ *
+ * 	.stabs "n_name", n_type, n_sect, n_desc, n_value
+ *
+ * where n_type is the defined constant and not listed in the comment.  Other
+ * fields not listed are zero. n_sect is the section ordinal the entry is
+ * referring to.
+ */
+/// global symbol: name,,NO_SECT,type,0
+pub const N_GSYM: u8 = 0x20;
+/// procedure name (f77 kludge): name,,NO_SECT,0,0
+pub const N_FNAME: u8 = 0x22;
+/// procedure: name,,n_sect,linenumber,address
+pub const N_FUN: u8 = 0x24;
+/// static symbol: name,,n_sect,type,address
+pub const N_STSYM: u8 = 0x26;
+/// .lcomm symbol: name,,n_sect,type,address
+pub const N_LCSYM: u8 = 0x28;
+/// begin nsect sym: 0,,n_sect,0,address
+pub const N_BNSYM: u8 = 0x2e;
+/// AST file path: name,,NO_SECT,0,0
+pub const N_AST: u8 = 0x32;
+/// emitted with gcc2_compiled and in gcc source
+pub const N_OPT: u8 = 0x3c;
+/// register sym: name,,NO_SECT,type,register
+pub const N_RSYM: u8 = 0x40;
+/// src line: 0,,n_sect,linenumber,address
+pub const N_SLINE: u8 = 0x44;
+/// end nsect sym: 0,,n_sect,0,address
+pub const N_ENSYM: u8 = 0x4e;
+/// structure elt: name,,NO_SECT,type,struct_offset
+pub const N_SSYM: u8 = 0x60;
+/// source file name: name,,n_sect,0,address
+pub const N_SO: u8 = 0x64;
+/// object file name: name,,0,0,st_mtime
+pub const N_OSO: u8 = 0x66;
+/// local sym: name,,NO_SECT,type,offset
+pub const N_LSYM: u8 = 0x80;
+/// include file beginning: name,,NO_SECT,0,sum
+pub const N_BINCL: u8 = 0x82;
+/// #included file name: name,,n_sect,0,address
+pub const N_SOL: u8 = 0x84;
+/// compiler parameters: name,,NO_SECT,0,0
+pub const N_PARAMS: u8 = 0x86;
+/// compiler version: name,,NO_SECT,0,0
+pub const N_VERSION: u8 = 0x88;
+/// compiler -O level: name,,NO_SECT,0,0
+pub const N_OLEVEL: u8 = 0x8A;
+/// parameter: name,,NO_SECT,type,offset
+pub const N_PSYM: u8 = 0xa0;
+/// include file end: name,,NO_SECT,0,0
+pub const N_EINCL: u8 = 0xa2;
+/// alternate entry: name,,n_sect,linenumber,address
+pub const N_ENTRY: u8 = 0xa4;
+/// left bracket: 0,,NO_SECT,nesting level,address
+pub const N_LBRAC: u8 = 0xc0;
+/// deleted include file: name,,NO_SECT,0,sum
+pub const N_EXCL: u8 = 0xc2;
+/// right bracket: 0,,NO_SECT,nesting level,address
+pub const N_RBRAC: u8 = 0xe0;
+/// begin common: name,,NO_SECT,0,0
+pub const N_BCOMM: u8 = 0xe2;
+/// end common: name,,n_sect,0,0
+pub const N_ECOMM: u8 = 0xe4;
+/// end common (local name): 0,,n_sect,0,address
+pub const N_ECOML: u8 = 0xe8;
+/// second stab entry with length information
+pub const N_LENG: u8 = 0xfe;
+
+/*
+ * for the berkeley pascal compiler, pc(1):
+ */
+/// global pascal symbol: name,,NO_SECT,subtype,line
+pub const N_PC: u8 = 0x30;
+
+// Definitions from "/usr/include/mach-o/reloc.h".
+
+/// A relocation entry.
+///
+/// Mach-O relocations have plain and scattered variants, with the
+/// meaning of the fields depending on the variant.
+///
+/// This type provides functions for determining whether the relocation
+/// is scattered, and for accessing the fields of each variant.
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct Relocation<E: Endian> {
+    pub r_word0: U32<E>,
+    pub r_word1: U32<E>,
+}
+
+impl<E: Endian> Relocation<E> {
+    /// Determine whether this is a scattered relocation.
+    #[inline]
+    pub fn r_scattered(self, endian: E, cputype: u32) -> bool {
+        if cputype == CPU_TYPE_X86_64 {
+            false
+        } else {
+            self.r_word0.get(endian) & R_SCATTERED != 0
+        }
+    }
+
+    /// Return the fields of a plain relocation.
+    pub fn info(self, endian: E) -> RelocationInfo {
+        let r_address = self.r_word0.get(endian);
+        let r_word1 = self.r_word1.get(endian);
+        if endian.is_little_endian() {
+            RelocationInfo {
+                r_address,
+                r_symbolnum: r_word1 & 0x00ff_ffff,
+                r_pcrel: ((r_word1 >> 24) & 0x1) != 0,
+                r_length: ((r_word1 >> 25) & 0x3) as u8,
+                r_extern: ((r_word1 >> 27) & 0x1) != 0,
+                r_type: (r_word1 >> 28) as u8,
+            }
+        } else {
+            RelocationInfo {
+                r_address,
+                r_symbolnum: r_word1 >> 8,
+                r_pcrel: ((r_word1 >> 7) & 0x1) != 0,
+                r_length: ((r_word1 >> 5) & 0x3) as u8,
+                r_extern: ((r_word1 >> 4) & 0x1) != 0,
+                r_type: (r_word1 & 0xf) as u8,
+            }
+        }
+    }
+
+    /// Return the fields of a scattered relocation.
+    pub fn scattered_info(self, endian: E) -> ScatteredRelocationInfo {
+        let r_word0 = self.r_word0.get(endian);
+        let r_value = self.r_word1.get(endian);
+        ScatteredRelocationInfo {
+            r_address: r_word0 & 0x00ff_ffff,
+            r_type: ((r_word0 >> 24) & 0xf) as u8,
+            r_length: ((r_word0 >> 28) & 0x3) as u8,
+            r_pcrel: ((r_word0 >> 30) & 0x1) != 0,
+            r_value,
+        }
+    }
+}
+
+/*
+ * Format of a relocation entry of a Mach-O file.  Modified from the 4.3BSD
+ * format.  The modifications from the original format were changing the value
+ * of the r_symbolnum field for "local" (r_extern == 0) relocation entries.
+ * This modification is required to support symbols in an arbitrary number of
+ * sections not just the three sections (text, data and bss) in a 4.3BSD file.
+ * Also the last 4 bits have had the r_type tag added to them.
+ */
+
+#[derive(Debug, Clone, Copy)]
+pub struct RelocationInfo {
+    /// offset in the section to what is being relocated
+    pub r_address: u32,
+    /// symbol index if r_extern == 1 or section ordinal if r_extern == 0
+    pub r_symbolnum: u32,
+    /// was relocated pc relative already
+    pub r_pcrel: bool,
+    /// 0=byte, 1=word, 2=long, 3=quad
+    pub r_length: u8,
+    /// does not include value of sym referenced
+    pub r_extern: bool,
+    /// if not 0, machine specific relocation type
+    pub r_type: u8,
+}
+
+impl RelocationInfo {
+    /// Combine the fields into a `Relocation`.
+    pub fn relocation<E: Endian>(self, endian: E) -> Relocation<E> {
+        let r_word0 = U32::new(endian, self.r_address);
+        let r_word1 = U32::new(
+            endian,
+            if endian.is_little_endian() {
+                self.r_symbolnum & 0x00ff_ffff
+                    | u32::from(self.r_pcrel) << 24
+                    | u32::from(self.r_length & 0x3) << 25
+                    | u32::from(self.r_extern) << 27
+                    | u32::from(self.r_type) << 28
+            } else {
+                self.r_symbolnum >> 8
+                    | u32::from(self.r_pcrel) << 7
+                    | u32::from(self.r_length & 0x3) << 5
+                    | u32::from(self.r_extern) << 4
+                    | u32::from(self.r_type) & 0xf
+            },
+        );
+        Relocation { r_word0, r_word1 }
+    }
+}
+
+/// absolute relocation type for Mach-O files
+pub const R_ABS: u8 = 0;
+
+/*
+ * The r_address is not really the address as it's name indicates but an offset.
+ * In 4.3BSD a.out objects this offset is from the start of the "segment" for
+ * which relocation entry is for (text or data).  For Mach-O object files it is
+ * also an offset but from the start of the "section" for which the relocation
+ * entry is for.  See comments in <mach-o/loader.h> about the r_address feild
+ * in images for used with the dynamic linker.
+ *
+ * In 4.3BSD a.out objects if r_extern is zero then r_symbolnum is an ordinal
+ * for the segment the symbol being relocated is in.  These ordinals are the
+ * symbol types N_TEXT, N_DATA, N_BSS or N_ABS.  In Mach-O object files these
+ * ordinals refer to the sections in the object file in the order their section
+ * structures appear in the headers of the object file they are in.  The first
+ * section has the ordinal 1, the second 2, and so on.  This means that the
+ * same ordinal in two different object files could refer to two different
+ * sections.  And further could have still different ordinals when combined
+ * by the link-editor.  The value R_ABS is used for relocation entries for
+ * absolute symbols which need no further relocation.
+ */
+
+/*
+ * For RISC machines some of the references are split across two instructions
+ * and the instruction does not contain the complete value of the reference.
+ * In these cases a second, or paired relocation entry, follows each of these
+ * relocation entries, using a PAIR r_type, which contains the other part of the
+ * reference not contained in the instruction.  This other part is stored in the
+ * pair's r_address field.  The exact number of bits of the other part of the
+ * reference store in the r_address field is dependent on the particular
+ * relocation type for the particular architecture.
+ */
+
+/*
+ * To make scattered loading by the link editor work correctly "local"
+ * relocation entries can't be used when the item to be relocated is the value
+ * of a symbol plus an offset (where the resulting expression is outside the
+ * block the link editor is moving, a blocks are divided at symbol addresses).
+ * In this case. where the item is a symbol value plus offset, the link editor
+ * needs to know more than just the section the symbol was defined.  What is
+ * needed is the actual value of the symbol without the offset so it can do the
+ * relocation correctly based on where the value of the symbol got relocated to
+ * not the value of the expression (with the offset added to the symbol value).
+ * So for the NeXT 2.0 release no "local" relocation entries are ever used when
+ * there is a non-zero offset added to a symbol.  The "external" and "local"
+ * relocation entries remain unchanged.
+ *
+ * The implementation is quite messy given the compatibility with the existing
+ * relocation entry format.  The ASSUMPTION is that a section will never be
+ * bigger than 2**24 - 1 (0x00ffffff or 16,777,215) bytes.  This assumption
+ * allows the r_address (which is really an offset) to fit in 24 bits and high
+ * bit of the r_address field in the relocation_info structure to indicate
+ * it is really a scattered_relocation_info structure.  Since these are only
+ * used in places where "local" relocation entries are used and not where
+ * "external" relocation entries are used the r_extern field has been removed.
+ *
+ * For scattered loading to work on a RISC machine where some of the references
+ * are split across two instructions the link editor needs to be assured that
+ * each reference has a unique 32 bit reference (that more than one reference is
+ * NOT sharing the same high 16 bits for example) so it move each referenced
+ * item independent of each other.  Some compilers guarantees this but the
+ * compilers don't so scattered loading can be done on those that do guarantee
+ * this.
+ */
+
+/// Bit set in `Relocation::r_word0` for scattered relocations.
+pub const R_SCATTERED: u32 = 0x8000_0000;
+
+#[derive(Debug, Clone, Copy)]
+pub struct ScatteredRelocationInfo {
+    /// offset in the section to what is being relocated
+    pub r_address: u32,
+    /// if not 0, machine specific relocation type
+    pub r_type: u8,
+    /// 0=byte, 1=word, 2=long, 3=quad
+    pub r_length: u8,
+    /// was relocated pc relative already
+    pub r_pcrel: bool,
+    /// the value the item to be relocated is referring to (without any offset added)
+    pub r_value: u32,
+}
+
+impl ScatteredRelocationInfo {
+    /// Combine the fields into a `Relocation`.
+    pub fn relocation<E: Endian>(self, endian: E) -> Relocation<E> {
+        let r_word0 = U32::new(
+            endian,
+            self.r_address & 0x00ff_ffff
+                | u32::from(self.r_type & 0xf) << 24
+                | u32::from(self.r_length & 0x3) << 28
+                | u32::from(self.r_pcrel) << 30
+                | R_SCATTERED,
+        );
+        let r_word1 = U32::new(endian, self.r_value);
+        Relocation { r_word0, r_word1 }
+    }
+}
+
+/*
+ * Relocation types used in a generic implementation.  Relocation entries for
+ * normal things use the generic relocation as described above and their r_type
+ * is GENERIC_RELOC_VANILLA (a value of zero).
+ *
+ * Another type of generic relocation, GENERIC_RELOC_SECTDIFF, is to support
+ * the difference of two symbols defined in different sections.  That is the
+ * expression "symbol1 - symbol2 + constant" is a relocatable expression when
+ * both symbols are defined in some section.  For this type of relocation the
+ * both relocations entries are scattered relocation entries.  The value of
+ * symbol1 is stored in the first relocation entry's r_value field and the
+ * value of symbol2 is stored in the pair's r_value field.
+ *
+ * A special case for a prebound lazy pointer is needed to beable to set the
+ * value of the lazy pointer back to its non-prebound state.  This is done
+ * using the GENERIC_RELOC_PB_LA_PTR r_type.  This is a scattered relocation
+ * entry where the r_value feild is the value of the lazy pointer not prebound.
+ */
+/// generic relocation as described above
+pub const GENERIC_RELOC_VANILLA: u8 = 0;
+/// Only follows a GENERIC_RELOC_SECTDIFF
+pub const GENERIC_RELOC_PAIR: u8 = 1;
+pub const GENERIC_RELOC_SECTDIFF: u8 = 2;
+/// prebound lazy pointer
+pub const GENERIC_RELOC_PB_LA_PTR: u8 = 3;
+pub const GENERIC_RELOC_LOCAL_SECTDIFF: u8 = 4;
+/// thread local variables
+pub const GENERIC_RELOC_TLV: u8 = 5;
+
+// Definitions from "/usr/include/mach-o/arm/reloc.h".
+
+/*
+ * Relocation types used in the arm implementation.  Relocation entries for
+ * things other than instructions use the same generic relocation as described
+ * in <mach-o/reloc.h> and their r_type is ARM_RELOC_VANILLA, one of the
+ * *_SECTDIFF or the *_PB_LA_PTR types.  The rest of the relocation types are
+ * for instructions.  Since they are for instructions the r_address field
+ * indicates the 32 bit instruction that the relocation is to be performed on.
+ */
+/// generic relocation as described above
+pub const ARM_RELOC_VANILLA: u8 = 0;
+/// the second relocation entry of a pair
+pub const ARM_RELOC_PAIR: u8 = 1;
+/// a PAIR follows with subtract symbol value
+pub const ARM_RELOC_SECTDIFF: u8 = 2;
+/// like ARM_RELOC_SECTDIFF, but the symbol referenced was local.
+pub const ARM_RELOC_LOCAL_SECTDIFF: u8 = 3;
+/// prebound lazy pointer
+pub const ARM_RELOC_PB_LA_PTR: u8 = 4;
+/// 24 bit branch displacement (to a word address)
+pub const ARM_RELOC_BR24: u8 = 5;
+/// 22 bit branch displacement (to a half-word address)
+pub const ARM_THUMB_RELOC_BR22: u8 = 6;
+/// obsolete - a thumb 32-bit branch instruction possibly needing page-spanning branch workaround
+pub const ARM_THUMB_32BIT_BRANCH: u8 = 7;
+
+/*
+ * For these two r_type relocations they always have a pair following them
+ * and the r_length bits are used differently.  The encoding of the
+ * r_length is as follows:
+ * low bit of r_length:
+ *  0 - :lower16: for movw instructions
+ *  1 - :upper16: for movt instructions
+ * high bit of r_length:
+ *  0 - arm instructions
+ *  1 - thumb instructions
+ * the other half of the relocated expression is in the following pair
+ * relocation entry in the the low 16 bits of r_address field.
+ */
+pub const ARM_RELOC_HALF: u8 = 8;
+pub const ARM_RELOC_HALF_SECTDIFF: u8 = 9;
+
+// Definitions from "/usr/include/mach-o/arm64/reloc.h".
+
+/*
+ * Relocation types used in the arm64 implementation.
+ */
+/// for pointers
+pub const ARM64_RELOC_UNSIGNED: u8 = 0;
+/// must be followed by a ARM64_RELOC_UNSIGNED
+pub const ARM64_RELOC_SUBTRACTOR: u8 = 1;
+/// a B/BL instruction with 26-bit displacement
+pub const ARM64_RELOC_BRANCH26: u8 = 2;
+/// pc-rel distance to page of target
+pub const ARM64_RELOC_PAGE21: u8 = 3;
+/// offset within page, scaled by r_length
+pub const ARM64_RELOC_PAGEOFF12: u8 = 4;
+/// pc-rel distance to page of GOT slot
+pub const ARM64_RELOC_GOT_LOAD_PAGE21: u8 = 5;
+/// offset within page of GOT slot, scaled by r_length
+pub const ARM64_RELOC_GOT_LOAD_PAGEOFF12: u8 = 6;
+/// for pointers to GOT slots
+pub const ARM64_RELOC_POINTER_TO_GOT: u8 = 7;
+/// pc-rel distance to page of TLVP slot
+pub const ARM64_RELOC_TLVP_LOAD_PAGE21: u8 = 8;
+/// offset within page of TLVP slot, scaled by r_length
+pub const ARM64_RELOC_TLVP_LOAD_PAGEOFF12: u8 = 9;
+/// must be followed by PAGE21 or PAGEOFF12
+pub const ARM64_RELOC_ADDEND: u8 = 10;
+
+// An arm64e authenticated pointer.
+//
+// Represents a pointer to a symbol (like ARM64_RELOC_UNSIGNED).
+// Additionally, the resulting pointer is signed.  The signature is
+// specified in the target location: the addend is restricted to the lower
+// 32 bits (instead of the full 64 bits for ARM64_RELOC_UNSIGNED):
+//
+//   |63|62|61-51|50-49|  48  |47     -     32|31  -  0|
+//   | 1| 0|  0  | key | addr | discriminator | addend |
+//
+// The key is one of:
+//   IA: 00 IB: 01
+//   DA: 10 DB: 11
+//
+// The discriminator field is used as extra signature diversification.
+//
+// The addr field indicates whether the target address should be blended
+// into the discriminator.
+//
+pub const ARM64_RELOC_AUTHENTICATED_POINTER: u8 = 11;
+
+// Definitions from "/usr/include/mach-o/ppc/reloc.h".
+
+/*
+ * Relocation types used in the ppc implementation.  Relocation entries for
+ * things other than instructions use the same generic relocation as described
+ * above and their r_type is RELOC_VANILLA.  The rest of the relocation types
+ * are for instructions.  Since they are for instructions the r_address field
+ * indicates the 32 bit instruction that the relocation is to be performed on.
+ * The fields r_pcrel and r_length are ignored for non-RELOC_VANILLA r_types
+ * except for PPC_RELOC_BR14.
+ *
+ * For PPC_RELOC_BR14 if the r_length is the unused value 3, then the branch was
+ * statically predicted setting or clearing the Y-bit based on the sign of the
+ * displacement or the opcode.  If this is the case the static linker must flip
+ * the value of the Y-bit if the sign of the displacement changes for non-branch
+ * always conditions.
+ */
+/// generic relocation as described above
+pub const PPC_RELOC_VANILLA: u8 = 0;
+/// the second relocation entry of a pair
+pub const PPC_RELOC_PAIR: u8 = 1;
+/// 14 bit branch displacement (to a word address)
+pub const PPC_RELOC_BR14: u8 = 2;
+/// 24 bit branch displacement (to a word address)
+pub const PPC_RELOC_BR24: u8 = 3;
+/// a PAIR follows with the low half
+pub const PPC_RELOC_HI16: u8 = 4;
+/// a PAIR follows with the high half
+pub const PPC_RELOC_LO16: u8 = 5;
+/// Same as the RELOC_HI16 except the low 16 bits and the high 16 bits are added together
+/// with the low 16 bits sign extended first.  This means if bit 15 of the low 16 bits is
+/// set the high 16 bits stored in the instruction will be adjusted.
+pub const PPC_RELOC_HA16: u8 = 6;
+/// Same as the LO16 except that the low 2 bits are not stored in the instruction and are
+/// always zero.  This is used in double word load/store instructions.
+pub const PPC_RELOC_LO14: u8 = 7;
+/// a PAIR follows with subtract symbol value
+pub const PPC_RELOC_SECTDIFF: u8 = 8;
+/// prebound lazy pointer
+pub const PPC_RELOC_PB_LA_PTR: u8 = 9;
+/// section difference forms of above.  a PAIR
+pub const PPC_RELOC_HI16_SECTDIFF: u8 = 10;
+/// follows these with subtract symbol value
+pub const PPC_RELOC_LO16_SECTDIFF: u8 = 11;
+pub const PPC_RELOC_HA16_SECTDIFF: u8 = 12;
+pub const PPC_RELOC_JBSR: u8 = 13;
+pub const PPC_RELOC_LO14_SECTDIFF: u8 = 14;
+/// like PPC_RELOC_SECTDIFF, but the symbol referenced was local.
+pub const PPC_RELOC_LOCAL_SECTDIFF: u8 = 15;
+
+// Definitions from "/usr/include/mach-o/x86_64/reloc.h".
+
+/*
+ * Relocations for x86_64 are a bit different than for other architectures in
+ * Mach-O: Scattered relocations are not used.  Almost all relocations produced
+ * by the compiler are external relocations.  An external relocation has the
+ * r_extern bit set to 1 and the r_symbolnum field contains the symbol table
+ * index of the target label.
+ *
+ * When the assembler is generating relocations, if the target label is a local
+ * label (begins with 'L'), then the previous non-local label in the same
+ * section is used as the target of the external relocation.  An addend is used
+ * with the distance from that non-local label to the target label.  Only when
+ * there is no previous non-local label in the section is an internal
+ * relocation used.
+ *
+ * The addend (i.e. the 4 in _foo+4) is encoded in the instruction (Mach-O does
+ * not have RELA relocations).  For PC-relative relocations, the addend is
+ * stored directly in the instruction.  This is different from other Mach-O
+ * architectures, which encode the addend minus the current section offset.
+ *
+ * The relocation types are:
+ *
+ * 	X86_64_RELOC_UNSIGNED	// for absolute addresses
+ * 	X86_64_RELOC_SIGNED		// for signed 32-bit displacement
+ * 	X86_64_RELOC_BRANCH		// a CALL/JMP instruction with 32-bit displacement
+ * 	X86_64_RELOC_GOT_LOAD	// a MOVQ load of a GOT entry
+ * 	X86_64_RELOC_GOT		// other GOT references
+ * 	X86_64_RELOC_SUBTRACTOR	// must be followed by a X86_64_RELOC_UNSIGNED
+ *
+ * The following are sample assembly instructions, followed by the relocation
+ * and section content they generate in an object file:
+ *
+ * 	call _foo
+ * 		r_type=X86_64_RELOC_BRANCH, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo
+ * 		E8 00 00 00 00
+ *
+ * 	call _foo+4
+ * 		r_type=X86_64_RELOC_BRANCH, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo
+ * 		E8 04 00 00 00
+ *
+ * 	movq _foo@GOTPCREL(%rip), %rax
+ * 		r_type=X86_64_RELOC_GOT_LOAD, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo
+ * 		48 8B 05 00 00 00 00
+ *
+ * 	pushq _foo@GOTPCREL(%rip)
+ * 		r_type=X86_64_RELOC_GOT, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo
+ * 		FF 35 00 00 00 00
+ *
+ * 	movl _foo(%rip), %eax
+ * 		r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo
+ * 		8B 05 00 00 00 00
+ *
+ * 	movl _foo+4(%rip), %eax
+ * 		r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo
+ * 		8B 05 04 00 00 00
+ *
+ * 	movb  $0x12, _foo(%rip)
+ * 		r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo
+ * 		C6 05 FF FF FF FF 12
+ *
+ * 	movl  $0x12345678, _foo(%rip)
+ * 		r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_foo
+ * 		C7 05 FC FF FF FF 78 56 34 12
+ *
+ * 	.quad _foo
+ * 		r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo
+ * 		00 00 00 00 00 00 00 00
+ *
+ * 	.quad _foo+4
+ * 		r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo
+ * 		04 00 00 00 00 00 00 00
+ *
+ * 	.quad _foo - _bar
+ * 		r_type=X86_64_RELOC_SUBTRACTOR, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_bar
+ * 		r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo
+ * 		00 00 00 00 00 00 00 00
+ *
+ * 	.quad _foo - _bar + 4
+ * 		r_type=X86_64_RELOC_SUBTRACTOR, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_bar
+ * 		r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo
+ * 		04 00 00 00 00 00 00 00
+ *
+ * 	.long _foo - _bar
+ * 		r_type=X86_64_RELOC_SUBTRACTOR, r_length=2, r_extern=1, r_pcrel=0, r_symbolnum=_bar
+ * 		r_type=X86_64_RELOC_UNSIGNED, r_length=2, r_extern=1, r_pcrel=0, r_symbolnum=_foo
+ * 		00 00 00 00
+ *
+ * 	lea L1(%rip), %rax
+ * 		r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=1, r_pcrel=1, r_symbolnum=_prev
+ * 		48 8d 05 12 00 00 00
+ * 		// assumes _prev is the first non-local label 0x12 bytes before L1
+ *
+ * 	lea L0(%rip), %rax
+ * 		r_type=X86_64_RELOC_SIGNED, r_length=2, r_extern=0, r_pcrel=1, r_symbolnum=3
+ * 		48 8d 05 56 00 00 00
+ *		// assumes L0 is in third section and there is no previous non-local label.
+ *		// The rip-relative-offset of 0x00000056 is L0-address_of_next_instruction.
+ *		// address_of_next_instruction is the address of the relocation + 4.
+ *
+ *     add     $6,L0(%rip)
+ *             r_type=X86_64_RELOC_SIGNED_1, r_length=2, r_extern=0, r_pcrel=1, r_symbolnum=3
+ *		83 05 18 00 00 00 06
+ *		// assumes L0 is in third section and there is no previous non-local label.
+ *		// The rip-relative-offset of 0x00000018 is L0-address_of_next_instruction.
+ *		// address_of_next_instruction is the address of the relocation + 4 + 1.
+ *		// The +1 comes from SIGNED_1.  This is used because the relocation is not
+ *		// at the end of the instruction.
+ *
+ * 	.quad L1
+ * 		r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_prev
+ * 		12 00 00 00 00 00 00 00
+ * 		// assumes _prev is the first non-local label 0x12 bytes before L1
+ *
+ * 	.quad L0
+ * 		r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=0, r_pcrel=0, r_symbolnum=3
+ * 		56 00 00 00 00 00 00 00
+ * 		// assumes L0 is in third section, has an address of 0x00000056 in .o
+ * 		// file, and there is no previous non-local label
+ *
+ * 	.quad _foo - .
+ * 		r_type=X86_64_RELOC_SUBTRACTOR, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_prev
+ * 		r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo
+ * 		EE FF FF FF FF FF FF FF
+ * 		// assumes _prev is the first non-local label 0x12 bytes before this
+ * 		// .quad
+ *
+ * 	.quad _foo - L1
+ * 		r_type=X86_64_RELOC_SUBTRACTOR, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_prev
+ * 		r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_extern=1, r_pcrel=0, r_symbolnum=_foo
+ * 		EE FF FF FF FF FF FF FF
+ * 		// assumes _prev is the first non-local label 0x12 bytes before L1
+ *
+ * 	.quad L1 - _prev
+ * 		// No relocations.  This is an assembly time constant.
+ * 		12 00 00 00 00 00 00 00
+ * 		// assumes _prev is the first non-local label 0x12 bytes before L1
+ *
+ *
+ *
+ * In final linked images, there are only two valid relocation kinds:
+ *
+ *     r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_pcrel=0, r_extern=1, r_symbolnum=sym_index
+ *	This tells dyld to add the address of a symbol to a pointer sized (8-byte)
+ *  piece of data (i.e on disk the 8-byte piece of data contains the addend). The
+ *  r_symbolnum contains the index into the symbol table of the target symbol.
+ *
+ *     r_type=X86_64_RELOC_UNSIGNED, r_length=3, r_pcrel=0, r_extern=0, r_symbolnum=0
+ * This tells dyld to adjust the pointer sized (8-byte) piece of data by the amount
+ * the containing image was loaded from its base address (e.g. slide).
+ *
+ */
+/// for absolute addresses
+pub const X86_64_RELOC_UNSIGNED: u8 = 0;
+/// for signed 32-bit displacement
+pub const X86_64_RELOC_SIGNED: u8 = 1;
+/// a CALL/JMP instruction with 32-bit displacement
+pub const X86_64_RELOC_BRANCH: u8 = 2;
+/// a MOVQ load of a GOT entry
+pub const X86_64_RELOC_GOT_LOAD: u8 = 3;
+/// other GOT references
+pub const X86_64_RELOC_GOT: u8 = 4;
+/// must be followed by a X86_64_RELOC_UNSIGNED
+pub const X86_64_RELOC_SUBTRACTOR: u8 = 5;
+/// for signed 32-bit displacement with a -1 addend
+pub const X86_64_RELOC_SIGNED_1: u8 = 6;
+/// for signed 32-bit displacement with a -2 addend
+pub const X86_64_RELOC_SIGNED_2: u8 = 7;
+/// for signed 32-bit displacement with a -4 addend
+pub const X86_64_RELOC_SIGNED_4: u8 = 8;
+/// for thread local variables
+pub const X86_64_RELOC_TLV: u8 = 9;
+
+unsafe_impl_pod!(FatHeader, FatArch32, FatArch64,);
+unsafe_impl_endian_pod!(
+    DyldCacheHeader,
+    DyldCacheMappingInfo,
+    DyldCacheImageInfo,
+    DyldSubCacheInfo,
+    MachHeader32,
+    MachHeader64,
+    LoadCommand,
+    LcStr,
+    SegmentCommand32,
+    SegmentCommand64,
+    Section32,
+    Section64,
+    Fvmlib,
+    FvmlibCommand,
+    Dylib,
+    DylibCommand,
+    SubFrameworkCommand,
+    SubClientCommand,
+    SubUmbrellaCommand,
+    SubLibraryCommand,
+    PreboundDylibCommand,
+    DylinkerCommand,
+    ThreadCommand,
+    RoutinesCommand32,
+    RoutinesCommand64,
+    SymtabCommand,
+    DysymtabCommand,
+    DylibTableOfContents,
+    DylibModule32,
+    DylibModule64,
+    DylibReference,
+    TwolevelHintsCommand,
+    TwolevelHint,
+    PrebindCksumCommand,
+    UuidCommand,
+    RpathCommand,
+    LinkeditDataCommand,
+    FilesetEntryCommand,
+    EncryptionInfoCommand32,
+    EncryptionInfoCommand64,
+    VersionMinCommand,
+    BuildVersionCommand,
+    BuildToolVersion,
+    DyldInfoCommand,
+    LinkerOptionCommand,
+    SymsegCommand,
+    IdentCommand,
+    FvmfileCommand,
+    EntryPointCommand,
+    SourceVersionCommand,
+    DataInCodeEntry,
+    //TlvDescriptor,
+    NoteCommand,
+    Nlist32,
+    Nlist64,
+    Relocation,
+);