diff options
Diffstat (limited to 'vendor/miniz_oxide/src/deflate')
| -rw-r--r-- | vendor/miniz_oxide/src/deflate/buffer.rs | 58 | ||||
| -rw-r--r-- | vendor/miniz_oxide/src/deflate/core.rs | 2462 | ||||
| -rw-r--r-- | vendor/miniz_oxide/src/deflate/mod.rs | 227 | ||||
| -rw-r--r-- | vendor/miniz_oxide/src/deflate/stream.rs | 121 |
4 files changed, 0 insertions, 2868 deletions
diff --git a/vendor/miniz_oxide/src/deflate/buffer.rs b/vendor/miniz_oxide/src/deflate/buffer.rs deleted file mode 100644 index f246c07..0000000 --- a/vendor/miniz_oxide/src/deflate/buffer.rs +++ /dev/null @@ -1,58 +0,0 @@ -//! Buffer wrappers implementing default so we can allocate the buffers with `Box::default()` -//! to avoid stack copies. Box::new() doesn't at the moment, and using a vec means we would lose -//! static length info. - -use crate::deflate::core::{LZ_DICT_SIZE, MAX_MATCH_LEN}; - -/// Size of the buffer of lz77 encoded data. -pub const LZ_CODE_BUF_SIZE: usize = 64 * 1024; -/// Size of the output buffer. -pub const OUT_BUF_SIZE: usize = (LZ_CODE_BUF_SIZE * 13) / 10; -pub const LZ_DICT_FULL_SIZE: usize = LZ_DICT_SIZE + MAX_MATCH_LEN - 1 + 1; - -/// Size of hash values in the hash chains. -pub const LZ_HASH_BITS: i32 = 15; -/// How many bits to shift when updating the current hash value. -pub const LZ_HASH_SHIFT: i32 = (LZ_HASH_BITS + 2) / 3; -/// Size of the chained hash tables. -pub const LZ_HASH_SIZE: usize = 1 << LZ_HASH_BITS; - -#[inline] -pub fn update_hash(current_hash: u16, byte: u8) -> u16 { - ((current_hash << LZ_HASH_SHIFT) ^ u16::from(byte)) & (LZ_HASH_SIZE as u16 - 1) -} - -pub struct HashBuffers { - pub dict: [u8; LZ_DICT_FULL_SIZE], - pub next: [u16; LZ_DICT_SIZE], - pub hash: [u16; LZ_DICT_SIZE], -} - -impl HashBuffers { - #[inline] - pub fn reset(&mut self) { - *self = HashBuffers::default(); - } -} - -impl Default for HashBuffers { - fn default() -> HashBuffers { - HashBuffers { - dict: [0; LZ_DICT_FULL_SIZE], - next: [0; LZ_DICT_SIZE], - hash: [0; LZ_DICT_SIZE], - } - } -} - -pub struct LocalBuf { - pub b: [u8; OUT_BUF_SIZE], -} - -impl Default for LocalBuf { - fn default() -> LocalBuf { - LocalBuf { - b: [0; OUT_BUF_SIZE], - } - } -} diff --git a/vendor/miniz_oxide/src/deflate/core.rs b/vendor/miniz_oxide/src/deflate/core.rs deleted file mode 100644 index d2db260..0000000 --- a/vendor/miniz_oxide/src/deflate/core.rs +++ /dev/null @@ -1,2462 +0,0 @@ -//! Streaming compression functionality. - -use alloc::boxed::Box; -use core::convert::TryInto; -use core::{cmp, mem}; - -use super::super::*; -use super::deflate_flags::*; -use super::CompressionLevel; -use crate::deflate::buffer::{ - update_hash, HashBuffers, LocalBuf, LZ_CODE_BUF_SIZE, LZ_DICT_FULL_SIZE, LZ_HASH_BITS, - LZ_HASH_SHIFT, LZ_HASH_SIZE, OUT_BUF_SIZE, -}; -use crate::shared::{update_adler32, HUFFMAN_LENGTH_ORDER, MZ_ADLER32_INIT}; -use crate::DataFormat; - -// Currently not bubbled up outside this module, so can fill in with more -// context eventually if needed. -type Result<T, E = Error> = core::result::Result<T, E>; -struct Error {} - -const MAX_PROBES_MASK: i32 = 0xFFF; - -const MAX_SUPPORTED_HUFF_CODESIZE: usize = 32; - -/// Length code for length values. -#[rustfmt::skip] -const LEN_SYM: [u16; 256] = [ - 257, 258, 259, 260, 261, 262, 263, 264, 265, 265, 266, 266, 267, 267, 268, 268, - 269, 269, 269, 269, 270, 270, 270, 270, 271, 271, 271, 271, 272, 272, 272, 272, - 273, 273, 273, 273, 273, 273, 273, 273, 274, 274, 274, 274, 274, 274, 274, 274, - 275, 275, 275, 275, 275, 275, 275, 275, 276, 276, 276, 276, 276, 276, 276, 276, - 277, 277, 277, 277, 277, 277, 277, 277, 277, 277, 277, 277, 277, 277, 277, 277, - 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, - 279, 279, 279, 279, 279, 279, 279, 279, 279, 279, 279, 279, 279, 279, 279, 279, - 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, 280, - 281, 281, 281, 281, 281, 281, 281, 281, 281, 281, 281, 281, 281, 281, 281, 281, - 281, 281, 281, 281, 281, 281, 281, 281, 281, 281, 281, 281, 281, 281, 281, 281, - 282, 282, 282, 282, 282, 282, 282, 282, 282, 282, 282, 282, 282, 282, 282, 282, - 282, 282, 282, 282, 282, 282, 282, 282, 282, 282, 282, 282, 282, 282, 282, 282, - 283, 283, 283, 283, 283, 283, 283, 283, 283, 283, 283, 283, 283, 283, 283, 283, - 283, 283, 283, 283, 283, 283, 283, 283, 283, 283, 283, 283, 283, 283, 283, 283, - 284, 284, 284, 284, 284, 284, 284, 284, 284, 284, 284, 284, 284, 284, 284, 284, - 284, 284, 284, 284, 284, 284, 284, 284, 284, 284, 284, 284, 284, 284, 284, 285 -]; - -/// Number of extra bits for length values. -#[rustfmt::skip] -const LEN_EXTRA: [u8; 256] = [ - 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, - 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, - 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, - 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, - 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, - 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, - 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, - 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, - 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, - 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, - 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, - 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, - 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, - 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, - 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, - 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 0 -]; - -/// Distance codes for distances smaller than 512. -#[rustfmt::skip] -const SMALL_DIST_SYM: [u8; 512] = [ - 0, 1, 2, 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, - 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, - 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, - 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, - 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, - 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, - 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, - 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, - 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, - 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, - 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, - 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, - 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, - 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, - 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, - 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, - 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, - 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, - 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, - 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, - 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, - 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, - 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, - 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, - 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, - 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, - 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, - 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, - 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, - 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, - 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, - 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17 -]; - -/// Number of extra bits for distances smaller than 512. -#[rustfmt::skip] -const SMALL_DIST_EXTRA: [u8; 512] = [ - 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, - 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, - 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, - 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, - 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, - 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, - 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, - 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, - 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, - 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, - 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, - 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, - 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, - 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, - 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, - 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7 -]; - -/// Base values to calculate distances above 512. -#[rustfmt::skip] -const LARGE_DIST_SYM: [u8; 128] = [ - 0, 0, 18, 19, 20, 20, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, - 24, 24, 24, 24, 24, 24, 24, 24, 25, 25, 25, 25, 25, 25, 25, 25, - 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, - 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, - 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, - 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, - 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, - 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29 -]; - -/// Number of extra bits distances above 512. -#[rustfmt::skip] -const LARGE_DIST_EXTRA: [u8; 128] = [ - 0, 0, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, - 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, - 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, - 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, - 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, - 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, - 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, - 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13 -]; - -#[rustfmt::skip] -const BITMASKS: [u32; 17] = [ - 0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F, 0x003F, 0x007F, 0x00FF, - 0x01FF, 0x03FF, 0x07FF, 0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF -]; - -/// The maximum number of checks for matches in the hash table the compressor will make for each -/// compression level. -const NUM_PROBES: [u32; 11] = [0, 1, 6, 32, 16, 32, 128, 256, 512, 768, 1500]; - -#[derive(Copy, Clone)] -struct SymFreq { - key: u16, - sym_index: u16, -} - -pub mod deflate_flags { - /// Whether to use a zlib wrapper. - pub const TDEFL_WRITE_ZLIB_HEADER: u32 = 0x0000_1000; - /// Should we compute the adler32 checksum. - pub const TDEFL_COMPUTE_ADLER32: u32 = 0x0000_2000; - /// Should we use greedy parsing (as opposed to lazy parsing where look ahead one or more - /// bytes to check for better matches.) - pub const TDEFL_GREEDY_PARSING_FLAG: u32 = 0x0000_4000; - /// Used in miniz to skip zero-initializing hash and dict. We don't do this here, so - /// this flag is ignored. - pub const TDEFL_NONDETERMINISTIC_PARSING_FLAG: u32 = 0x0000_8000; - /// Only look for matches with a distance of 0. - pub const TDEFL_RLE_MATCHES: u32 = 0x0001_0000; - /// Only use matches that are at least 6 bytes long. - pub const TDEFL_FILTER_MATCHES: u32 = 0x0002_0000; - /// Force the compressor to only output static blocks. (Blocks using the default huffman codes - /// specified in the deflate specification.) - pub const TDEFL_FORCE_ALL_STATIC_BLOCKS: u32 = 0x0004_0000; - /// Force the compressor to only output raw/uncompressed blocks. - pub const TDEFL_FORCE_ALL_RAW_BLOCKS: u32 = 0x0008_0000; -} - -/// Strategy setting for compression. -/// -/// The non-default settings offer some special-case compression variants. -#[repr(i32)] -#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)] -pub enum CompressionStrategy { - /// Don't use any of the special strategies. - Default = 0, - /// Only use matches that are at least 5 bytes long. - Filtered = 1, - /// Don't look for matches, only huffman encode the literals. - HuffmanOnly = 2, - /// Only look for matches with a distance of 1, i.e do run-length encoding only. - RLE = 3, - /// Only use static/fixed blocks. (Blocks using the default huffman codes - /// specified in the deflate specification.) - Fixed = 4, -} - -/// A list of deflate flush types. -#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)] -pub enum TDEFLFlush { - /// Normal operation. - /// - /// Compress as much as there is space for, and then return waiting for more input. - None = 0, - - /// Try to flush all the current data and output an empty raw block. - Sync = 2, - - /// Same as [`Sync`][Self::Sync], but reset the dictionary so that the following data does not - /// depend on previous data. - Full = 3, - - /// Try to flush everything and end the deflate stream. - /// - /// On success this will yield a [`TDEFLStatus::Done`] return status. - Finish = 4, -} - -impl From<MZFlush> for TDEFLFlush { - fn from(flush: MZFlush) -> Self { - match flush { - MZFlush::None => TDEFLFlush::None, - MZFlush::Sync => TDEFLFlush::Sync, - MZFlush::Full => TDEFLFlush::Full, - MZFlush::Finish => TDEFLFlush::Finish, - _ => TDEFLFlush::None, // TODO: ??? What to do ??? - } - } -} - -impl TDEFLFlush { - pub fn new(flush: i32) -> Result<Self, MZError> { - match flush { - 0 => Ok(TDEFLFlush::None), - 2 => Ok(TDEFLFlush::Sync), - 3 => Ok(TDEFLFlush::Full), - 4 => Ok(TDEFLFlush::Finish), - _ => Err(MZError::Param), - } - } -} - -/// Return status of compression. -#[repr(i32)] -#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)] -pub enum TDEFLStatus { - /// Usage error. - /// - /// This indicates that either the [`CompressorOxide`] experienced a previous error, or the - /// stream has already been [`TDEFLFlush::Finish`]'d. - BadParam = -2, - - /// Error putting data into output buffer. - /// - /// This usually indicates a too-small buffer. - PutBufFailed = -1, - - /// Compression succeeded normally. - Okay = 0, - - /// Compression succeeded and the deflate stream was ended. - /// - /// This is the result of calling compression with [`TDEFLFlush::Finish`]. - Done = 1, -} - -const MAX_HUFF_SYMBOLS: usize = 288; -/// Size of hash chain for fast compression mode. -const LEVEL1_HASH_SIZE_MASK: u32 = 4095; -/// The number of huffman tables used by the compressor. -/// Literal/length, Distances and Length of the huffman codes for the other two tables. -const MAX_HUFF_TABLES: usize = 3; -/// Literal/length codes -const MAX_HUFF_SYMBOLS_0: usize = 288; -/// Distance codes. -const MAX_HUFF_SYMBOLS_1: usize = 32; -/// Huffman length values. -const MAX_HUFF_SYMBOLS_2: usize = 19; -/// Size of the chained hash table. -pub(crate) const LZ_DICT_SIZE: usize = 32_768; -/// Mask used when stepping through the hash chains. -const LZ_DICT_SIZE_MASK: usize = (LZ_DICT_SIZE as u32 - 1) as usize; -/// The minimum length of a match. -const MIN_MATCH_LEN: u8 = 3; -/// The maximum length of a match. -pub(crate) const MAX_MATCH_LEN: usize = 258; - -const DEFAULT_FLAGS: u32 = NUM_PROBES[4] | TDEFL_WRITE_ZLIB_HEADER; - -mod zlib { - const DEFAULT_CM: u8 = 8; - const DEFAULT_CINFO: u8 = 7 << 4; - const _DEFAULT_FDICT: u8 = 0; - const DEFAULT_CMF: u8 = DEFAULT_CM | DEFAULT_CINFO; - /// The 16-bit value consisting of CMF and FLG must be divisible by this to be valid. - const FCHECK_DIVISOR: u8 = 31; - - /// Generate FCHECK from CMF and FLG (without FCKECH )so that they are correct according to the - /// specification, i.e (CMF*256 + FCHK) % 31 = 0. - /// Returns flg with the FCHKECK bits added (any existing FCHECK bits are ignored). - fn add_fcheck(cmf: u8, flg: u8) -> u8 { - let rem = ((usize::from(cmf) * 256) + usize::from(flg)) % usize::from(FCHECK_DIVISOR); - - // Clear existing FCHECK if any - let flg = flg & 0b11100000; - - // Casting is safe as rem can't overflow since it is a value mod 31 - // We can simply add the value to flg as (31 - rem) will never be above 2^5 - flg + (FCHECK_DIVISOR - rem as u8) - } - - fn zlib_level_from_flags(flags: u32) -> u8 { - use super::NUM_PROBES; - - let num_probes = flags & (super::MAX_PROBES_MASK as u32); - if flags & super::TDEFL_GREEDY_PARSING_FLAG != 0 { - if num_probes <= 1 { - 0 - } else { - 1 - } - } else if num_probes >= NUM_PROBES[9] { - 3 - } else { - 2 - } - } - - /// Get the zlib header for the level using the default window size and no - /// dictionary. - fn header_from_level(level: u8) -> [u8; 2] { - let cmf = DEFAULT_CMF; - [cmf, add_fcheck(cmf, (level as u8) << 6)] - } - - /// Create a zlib header from the given compression flags. - /// Only level is considered. - pub fn header_from_flags(flags: u32) -> [u8; 2] { - let level = zlib_level_from_flags(flags); - header_from_level(level) - } - - #[cfg(test)] - mod test { - #[test] - fn zlib() { - use super::super::*; - use super::*; - - let test_level = |level, expected| { - let flags = create_comp_flags_from_zip_params( - level, - MZ_DEFAULT_WINDOW_BITS, - CompressionStrategy::Default as i32, - ); - assert_eq!(zlib_level_from_flags(flags), expected); - }; - - assert_eq!(zlib_level_from_flags(DEFAULT_FLAGS), 2); - test_level(0, 0); - test_level(1, 0); - test_level(2, 1); - test_level(3, 1); - for i in 4..=8 { - test_level(i, 2) - } - test_level(9, 3); - test_level(10, 3); - } - - #[test] - fn test_header() { - let header = super::header_from_level(3); - assert_eq!( - ((usize::from(header[0]) * 256) + usize::from(header[1])) % 31, - 0 - ); - } - } -} - -fn memset<T: Copy>(slice: &mut [T], val: T) { - for x in slice { - *x = val - } -} - -#[cfg(test)] -#[inline] -fn write_u16_le(val: u16, slice: &mut [u8], pos: usize) { - slice[pos] = val as u8; - slice[pos + 1] = (val >> 8) as u8; -} - -// Read the two bytes starting at pos and interpret them as an u16. -#[inline] -const fn read_u16_le(slice: &[u8], pos: usize) -> u16 { - // The compiler is smart enough to optimize this into an unaligned load. - slice[pos] as u16 | ((slice[pos + 1] as u16) << 8) -} - -/// Main compression struct. -pub struct CompressorOxide { - lz: LZOxide, - params: ParamsOxide, - huff: Box<HuffmanOxide>, - dict: DictOxide, -} - -impl CompressorOxide { - /// Create a new `CompressorOxide` with the given flags. - /// - /// # Notes - /// This function may be changed to take different parameters in the future. - pub fn new(flags: u32) -> Self { - CompressorOxide { - lz: LZOxide::new(), - params: ParamsOxide::new(flags), - /// Put HuffmanOxide on the heap with default trick to avoid - /// excessive stack copies. - huff: Box::default(), - dict: DictOxide::new(flags), - } - } - - /// Get the adler32 checksum of the currently encoded data. - pub const fn adler32(&self) -> u32 { - self.params.adler32 - } - - /// Get the return status of the previous [`compress`](fn.compress.html) - /// call with this compressor. - pub const fn prev_return_status(&self) -> TDEFLStatus { - self.params.prev_return_status - } - - /// Get the raw compressor flags. - /// - /// # Notes - /// This function may be deprecated or changed in the future to use more rust-style flags. - pub const fn flags(&self) -> i32 { - self.params.flags as i32 - } - - /// Returns whether the compressor is wrapping the data in a zlib format or not. - pub fn data_format(&self) -> DataFormat { - if (self.params.flags & TDEFL_WRITE_ZLIB_HEADER) != 0 { - DataFormat::Zlib - } else { - DataFormat::Raw - } - } - - /// Reset the state of the compressor, keeping the same parameters. - /// - /// This avoids re-allocating data. - pub fn reset(&mut self) { - // LZ buf and huffman has no settings or dynamic memory - // that needs to be saved, so we simply replace them. - self.lz = LZOxide::new(); - self.params.reset(); - *self.huff = HuffmanOxide::default(); - self.dict.reset(); - } - - /// Set the compression level of the compressor. - /// - /// Using this to change level after compression has started is supported. - /// # Notes - /// The compression strategy will be reset to the default one when this is called. - pub fn set_compression_level(&mut self, level: CompressionLevel) { - let format = self.data_format(); - self.set_format_and_level(format, level as u8); - } - - /// Set the compression level of the compressor using an integer value. - /// - /// Using this to change level after compression has started is supported. - /// # Notes - /// The compression strategy will be reset to the default one when this is called. - pub fn set_compression_level_raw(&mut self, level: u8) { - let format = self.data_format(); - self.set_format_and_level(format, level); - } - - /// Update the compression settings of the compressor. - /// - /// Changing the `DataFormat` after compression has started will result in - /// a corrupted stream. - /// - /// # Notes - /// This function mainly intended for setting the initial settings after e.g creating with - /// `default` or after calling `CompressorOxide::reset()`, and behaviour may be changed - /// to disallow calling it after starting compression in the future. - pub fn set_format_and_level(&mut self, data_format: DataFormat, level: u8) { - let flags = create_comp_flags_from_zip_params( - level.into(), - data_format.to_window_bits(), - CompressionStrategy::Default as i32, - ); - self.params.update_flags(flags); - self.dict.update_flags(flags); - } -} - -impl Default for CompressorOxide { - /// Initialize the compressor with a level of 4, zlib wrapper and - /// the default strategy. - fn default() -> Self { - CompressorOxide { - lz: LZOxide::new(), - params: ParamsOxide::new(DEFAULT_FLAGS), - /// Put HuffmanOxide on the heap with default trick to avoid - /// excessive stack copies. - huff: Box::default(), - dict: DictOxide::new(DEFAULT_FLAGS), - } - } -} - -/// Callback function and user used in `compress_to_output`. -pub struct CallbackFunc<'a> { - pub put_buf_func: &'a mut dyn FnMut(&[u8]) -> bool, -} - -impl<'a> CallbackFunc<'a> { - fn flush_output( - &mut self, - saved_output: SavedOutputBufferOxide, - params: &mut ParamsOxide, - ) -> i32 { - // TODO: As this could be unsafe since - // we can't verify the function pointer - // this whole function should maybe be unsafe as well. - let call_success = (self.put_buf_func)(¶ms.local_buf.b[0..saved_output.pos as usize]); - - if !call_success { - params.prev_return_status = TDEFLStatus::PutBufFailed; - return params.prev_return_status as i32; - } - - params.flush_remaining as i32 - } -} - -struct CallbackBuf<'a> { - pub out_buf: &'a mut [u8], -} - -impl<'a> CallbackBuf<'a> { - fn flush_output( - &mut self, - saved_output: SavedOutputBufferOxide, - params: &mut ParamsOxide, - ) -> i32 { - if saved_output.local { - let n = cmp::min( - saved_output.pos as usize, - self.out_buf.len() - params.out_buf_ofs, - ); - (&mut self.out_buf[params.out_buf_ofs..params.out_buf_ofs + n]) - .copy_from_slice(¶ms.local_buf.b[..n]); - - params.out_buf_ofs += n; - if saved_output.pos != n { - params.flush_ofs = n as u32; - params.flush_remaining = (saved_output.pos - n) as u32; - } - } else { - params.out_buf_ofs += saved_output.pos; - } - - params.flush_remaining as i32 - } -} - -enum CallbackOut<'a> { - Func(CallbackFunc<'a>), - Buf(CallbackBuf<'a>), -} - -impl<'a> CallbackOut<'a> { - fn new_output_buffer<'b>( - &'b mut self, - local_buf: &'b mut [u8], - out_buf_ofs: usize, - ) -> OutputBufferOxide<'b> { - let is_local; - let buf_len = OUT_BUF_SIZE - 16; - let chosen_buffer = match *self { - CallbackOut::Buf(ref mut cb) if cb.out_buf.len() - out_buf_ofs >= OUT_BUF_SIZE => { - is_local = false; - &mut cb.out_buf[out_buf_ofs..out_buf_ofs + buf_len] - } - _ => { - is_local = true; - &mut local_buf[..buf_len] - } - }; - - OutputBufferOxide { - inner: chosen_buffer, - inner_pos: 0, - local: is_local, - bit_buffer: 0, - bits_in: 0, - } - } -} - -struct CallbackOxide<'a> { - in_buf: Option<&'a [u8]>, - in_buf_size: Option<&'a mut usize>, - out_buf_size: Option<&'a mut usize>, - out: CallbackOut<'a>, -} - -impl<'a> CallbackOxide<'a> { - fn new_callback_buf(in_buf: &'a [u8], out_buf: &'a mut [u8]) -> Self { - CallbackOxide { - in_buf: Some(in_buf), - in_buf_size: None, - out_buf_size: None, - out: CallbackOut::Buf(CallbackBuf { out_buf }), - } - } - - fn new_callback_func(in_buf: &'a [u8], callback_func: CallbackFunc<'a>) -> Self { - CallbackOxide { - in_buf: Some(in_buf), - in_buf_size: None, - out_buf_size: None, - out: CallbackOut::Func(callback_func), - } - } - - fn update_size(&mut self, in_size: Option<usize>, out_size: Option<usize>) { - if let (Some(in_size), Some(size)) = (in_size, self.in_buf_size.as_mut()) { - **size = in_size; - } - - if let (Some(out_size), Some(size)) = (out_size, self.out_buf_size.as_mut()) { - **size = out_size - } - } - - fn flush_output( - &mut self, - saved_output: SavedOutputBufferOxide, - params: &mut ParamsOxide, - ) -> i32 { - if saved_output.pos == 0 { - return params.flush_remaining as i32; - } - - self.update_size(Some(params.src_pos), None); - match self.out { - CallbackOut::Func(ref mut cf) => cf.flush_output(saved_output, params), - CallbackOut::Buf(ref mut cb) => cb.flush_output(saved_output, params), - } - } -} - -struct OutputBufferOxide<'a> { - pub inner: &'a mut [u8], - pub inner_pos: usize, - pub local: bool, - - pub bit_buffer: u32, - pub bits_in: u32, -} - -impl<'a> OutputBufferOxide<'a> { - fn put_bits(&mut self, bits: u32, len: u32) { - assert!(bits <= ((1u32 << len) - 1u32)); - self.bit_buffer |= bits << self.bits_in; - self.bits_in += len; - while self.bits_in >= 8 { - self.inner[self.inner_pos] = self.bit_buffer as u8; - self.inner_pos += 1; - self.bit_buffer >>= 8; - self.bits_in -= 8; - } - } - - const fn save(&self) -> SavedOutputBufferOxide { - SavedOutputBufferOxide { - pos: self.inner_pos, - bit_buffer: self.bit_buffer, - bits_in: self.bits_in, - local: self.local, - } - } - - fn load(&mut self, saved: SavedOutputBufferOxide) { - self.inner_pos = saved.pos; - self.bit_buffer = saved.bit_buffer; - self.bits_in = saved.bits_in; - self.local = saved.local; - } - - fn pad_to_bytes(&mut self) { - if self.bits_in != 0 { - let len = 8 - self.bits_in; - self.put_bits(0, len); - } - } -} - -struct SavedOutputBufferOxide { - pub pos: usize, - pub bit_buffer: u32, - pub bits_in: u32, - pub local: bool, -} - -struct BitBuffer { - pub bit_buffer: u64, - pub bits_in: u32, -} - -impl BitBuffer { - fn put_fast(&mut self, bits: u64, len: u32) { - self.bit_buffer |= bits << self.bits_in; - self.bits_in += len; - } - - fn flush(&mut self, output: &mut OutputBufferOxide) -> Result<()> { - let pos = output.inner_pos; - { - // isolation to please borrow checker - let inner = &mut output.inner[pos..pos + 8]; - let bytes = u64::to_le_bytes(self.bit_buffer); - inner.copy_from_slice(&bytes); - } - match output.inner_pos.checked_add((self.bits_in >> 3) as usize) { - Some(n) if n <= output.inner.len() => output.inner_pos = n, - _ => return Err(Error {}), - } - self.bit_buffer >>= self.bits_in & !7; - self.bits_in &= 7; - Ok(()) - } -} - -/// A struct containing data about huffman codes and symbol frequencies. -/// -/// NOTE: Only the literal/lengths have enough symbols to actually use -/// the full array. It's unclear why it's defined like this in miniz, -/// it could be for cache/alignment reasons. -struct HuffmanOxide { - /// Number of occurrences of each symbol. - pub count: [[u16; MAX_HUFF_SYMBOLS]; MAX_HUFF_TABLES], - /// The bits of the huffman code assigned to the symbol - pub codes: [[u16; MAX_HUFF_SYMBOLS]; MAX_HUFF_TABLES], - /// The length of the huffman code assigned to the symbol. - pub code_sizes: [[u8; MAX_HUFF_SYMBOLS]; MAX_HUFF_TABLES], -} - -/// Tables used for literal/lengths in `HuffmanOxide`. -const LITLEN_TABLE: usize = 0; -/// Tables for distances. -const DIST_TABLE: usize = 1; -/// Tables for the run-length encoded huffman lengths for literals/lengths/distances. -const HUFF_CODES_TABLE: usize = 2; - -/// Status of RLE encoding of huffman code lengths. -struct Rle { - pub z_count: u32, - pub repeat_count: u32, - pub prev_code_size: u8, -} - -impl Rle { - fn prev_code_size( - &mut self, - packed_code_sizes: &mut [u8], - packed_pos: &mut usize, - h: &mut HuffmanOxide, - ) -> Result<()> { - let mut write = |buf| write(buf, packed_code_sizes, packed_pos); - let counts = &mut h.count[HUFF_CODES_TABLE]; - if self.repeat_count != 0 { - if self.repeat_count < 3 { - counts[self.prev_code_size as usize] = - counts[self.prev_code_size as usize].wrapping_add(self.repeat_count as u16); - let code = self.prev_code_size; - write(&[code, code, code][..self.repeat_count as usize])?; - } else { - counts[16] = counts[16].wrapping_add(1); - write(&[16, (self.repeat_count - 3) as u8][..])?; - } - self.repeat_count = 0; - } - - Ok(()) - } - - fn zero_code_size( - &mut self, - packed_code_sizes: &mut [u8], - packed_pos: &mut usize, - h: &mut HuffmanOxide, - ) -> Result<()> { - let mut write = |buf| write(buf, packed_code_sizes, packed_pos); - let counts = &mut h.count[HUFF_CODES_TABLE]; - if self.z_count != 0 { - if self.z_count < 3 { - counts[0] = counts[0].wrapping_add(self.z_count as u16); - write(&[0, 0, 0][..self.z_count as usize])?; - } else if self.z_count <= 10 { - counts[17] = counts[17].wrapping_add(1); - write(&[17, (self.z_count - 3) as u8][..])?; - } else { - counts[18] = counts[18].wrapping_add(1); - write(&[18, (self.z_count - 11) as u8][..])?; - } - self.z_count = 0; - } - - Ok(()) - } -} - -fn write(src: &[u8], dst: &mut [u8], dst_pos: &mut usize) -> Result<()> { - match dst.get_mut(*dst_pos..*dst_pos + src.len()) { - Some(s) => s.copy_from_slice(src), - None => return Err(Error {}), - } - *dst_pos += src.len(); - Ok(()) -} - -impl Default for HuffmanOxide { - fn default() -> Self { - HuffmanOxide { - count: [[0; MAX_HUFF_SYMBOLS]; MAX_HUFF_TABLES], - codes: [[0; MAX_HUFF_SYMBOLS]; MAX_HUFF_TABLES], - code_sizes: [[0; MAX_HUFF_SYMBOLS]; MAX_HUFF_TABLES], - } - } -} - -impl HuffmanOxide { - fn radix_sort_symbols<'a>( - symbols0: &'a mut [SymFreq], - symbols1: &'a mut [SymFreq], - ) -> &'a mut [SymFreq] { - let mut hist = [[0; 256]; 2]; - - for freq in symbols0.iter() { - hist[0][(freq.key & 0xFF) as usize] += 1; - hist[1][((freq.key >> 8) & 0xFF) as usize] += 1; - } - - let mut n_passes = 2; - if symbols0.len() == hist[1][0] { - n_passes -= 1; - } - - let mut current_symbols = symbols0; - let mut new_symbols = symbols1; - - for (pass, hist_item) in hist.iter().enumerate().take(n_passes) { - let mut offsets = [0; 256]; - let mut offset = 0; - for i in 0..256 { - offsets[i] = offset; - offset += hist_item[i]; - } - - for sym in current_symbols.iter() { - let j = ((sym.key >> (pass * 8)) & 0xFF) as usize; - new_symbols[offsets[j]] = *sym; - offsets[j] += 1; - } - - mem::swap(&mut current_symbols, &mut new_symbols); - } - - current_symbols - } - - fn calculate_minimum_redundancy(symbols: &mut [SymFreq]) { - match symbols.len() { - 0 => (), - 1 => symbols[0].key = 1, - n => { - symbols[0].key += symbols[1].key; - let mut root = 0; - let mut leaf = 2; - for next in 1..n - 1 { - if (leaf >= n) || (symbols[root].key < symbols[leaf].key) { - symbols[next].key = symbols[root].key; - symbols[root].key = next as u16; - root += 1; - } else { - symbols[next].key = symbols[leaf].key; - leaf += 1; - } - - if (leaf >= n) || (root < next && symbols[root].key < symbols[leaf].key) { - symbols[next].key = symbols[next].key.wrapping_add(symbols[root].key); - symbols[root].key = next as u16; - root += 1; - } else { - symbols[next].key = symbols[next].key.wrapping_add(symbols[leaf].key); - leaf += 1; - } - } - - symbols[n - 2].key = 0; - for next in (0..n - 2).rev() { - symbols[next].key = symbols[symbols[next].key as usize].key + 1; - } - - let mut avbl = 1; - let mut used = 0; - let mut dpth = 0; - let mut root = (n - 2) as i32; - let mut next = (n - 1) as i32; - while avbl > 0 { - while (root >= 0) && (symbols[root as usize].key == dpth) { - used += 1; - root -= 1; - } - while avbl > used { - symbols[next as usize].key = dpth; - next -= 1; - avbl -= 1; - } - avbl = 2 * used; - dpth += 1; - used = 0; - } - } - } - } - - fn enforce_max_code_size(num_codes: &mut [i32], code_list_len: usize, max_code_size: usize) { - if code_list_len <= 1 { - return; - } - - num_codes[max_code_size] += num_codes[max_code_size + 1..].iter().sum::<i32>(); - let total = num_codes[1..=max_code_size] - .iter() - .rev() - .enumerate() - .fold(0u32, |total, (i, &x)| total + ((x as u32) << i)); - - for _ in (1 << max_code_size)..total { - num_codes[max_code_size] -= 1; - for i in (1..max_code_size).rev() { - if num_codes[i] != 0 { - num_codes[i] -= 1; - num_codes[i + 1] += 2; - break; - } - } - } - } - - fn optimize_table( - &mut self, - table_num: usize, - table_len: usize, - code_size_limit: usize, - static_table: bool, - ) { - let mut num_codes = [0i32; MAX_SUPPORTED_HUFF_CODESIZE + 1]; - let mut next_code = [0u32; MAX_SUPPORTED_HUFF_CODESIZE + 1]; - - if static_table { - for &code_size in &self.code_sizes[table_num][..table_len] { - num_codes[code_size as usize] += 1; - } - } else { - let mut symbols0 = [SymFreq { - key: 0, - sym_index: 0, - }; MAX_HUFF_SYMBOLS]; - let mut symbols1 = [SymFreq { - key: 0, - sym_index: 0, - }; MAX_HUFF_SYMBOLS]; - - let mut num_used_symbols = 0; - for i in 0..table_len { - if self.count[table_num][i] != 0 { - symbols0[num_used_symbols] = SymFreq { - key: self.count[table_num][i], - sym_index: i as u16, - }; - num_used_symbols += 1; - } - } - - let symbols = Self::radix_sort_symbols( - &mut symbols0[..num_used_symbols], - &mut symbols1[..num_used_symbols], - ); - Self::calculate_minimum_redundancy(symbols); - - for symbol in symbols.iter() { - num_codes[symbol.key as usize] += 1; - } - - Self::enforce_max_code_size(&mut num_codes, num_used_symbols, code_size_limit); - - memset(&mut self.code_sizes[table_num][..], 0); - memset(&mut self.codes[table_num][..], 0); - - let mut last = num_used_symbols; - for (i, &num_item) in num_codes - .iter() - .enumerate() - .take(code_size_limit + 1) - .skip(1) - { - let first = last - num_item as usize; - for symbol in &symbols[first..last] { - self.code_sizes[table_num][symbol.sym_index as usize] = i as u8; - } - last = first; - } - } - - let mut j = 0; - next_code[1] = 0; - for i in 2..=code_size_limit { - j = (j + num_codes[i - 1]) << 1; - next_code[i] = j as u32; - } - - for (&code_size, huff_code) in self.code_sizes[table_num] - .iter() - .take(table_len) - .zip(self.codes[table_num].iter_mut().take(table_len)) - { - if code_size == 0 { - continue; - } - - let mut code = next_code[code_size as usize]; - next_code[code_size as usize] += 1; - - let mut rev_code = 0; - for _ in 0..code_size { - rev_code = (rev_code << 1) | (code & 1); - code >>= 1; - } - *huff_code = rev_code as u16; - } - } - - fn start_static_block(&mut self, output: &mut OutputBufferOxide) { - memset(&mut self.code_sizes[LITLEN_TABLE][0..144], 8); - memset(&mut self.code_sizes[LITLEN_TABLE][144..256], 9); - memset(&mut self.code_sizes[LITLEN_TABLE][256..280], 7); - memset(&mut self.code_sizes[LITLEN_TABLE][280..288], 8); - - memset(&mut self.code_sizes[DIST_TABLE][..32], 5); - - self.optimize_table(LITLEN_TABLE, 288, 15, true); - self.optimize_table(DIST_TABLE, 32, 15, true); - - output.put_bits(0b01, 2) - } - - fn start_dynamic_block(&mut self, output: &mut OutputBufferOxide) -> Result<()> { - // There will always be one, and only one end of block code. - self.count[0][256] = 1; - - self.optimize_table(0, MAX_HUFF_SYMBOLS_0, 15, false); - self.optimize_table(1, MAX_HUFF_SYMBOLS_1, 15, false); - - let num_lit_codes = 286 - - &self.code_sizes[0][257..286] - .iter() - .rev() - .take_while(|&x| *x == 0) - .count(); - - let num_dist_codes = 30 - - &self.code_sizes[1][1..30] - .iter() - .rev() - .take_while(|&x| *x == 0) - .count(); - - let mut code_sizes_to_pack = [0u8; MAX_HUFF_SYMBOLS_0 + MAX_HUFF_SYMBOLS_1]; - let mut packed_code_sizes = [0u8; MAX_HUFF_SYMBOLS_0 + MAX_HUFF_SYMBOLS_1]; - - let total_code_sizes_to_pack = num_lit_codes + num_dist_codes; - - code_sizes_to_pack[..num_lit_codes].copy_from_slice(&self.code_sizes[0][..num_lit_codes]); - - code_sizes_to_pack[num_lit_codes..total_code_sizes_to_pack] - .copy_from_slice(&self.code_sizes[1][..num_dist_codes]); - - let mut rle = Rle { - z_count: 0, - repeat_count: 0, - prev_code_size: 0xFF, - }; - - memset(&mut self.count[HUFF_CODES_TABLE][..MAX_HUFF_SYMBOLS_2], 0); - - let mut packed_pos = 0; - for &code_size in &code_sizes_to_pack[..total_code_sizes_to_pack] { - if code_size == 0 { - rle.prev_code_size(&mut packed_code_sizes, &mut packed_pos, self)?; - rle.z_count += 1; - if rle.z_count == 138 { - rle.zero_code_size(&mut packed_code_sizes, &mut packed_pos, self)?; - } - } else { - rle.zero_code_size(&mut packed_code_sizes, &mut packed_pos, self)?; - if code_size != rle.prev_code_size { - rle.prev_code_size(&mut packed_code_sizes, &mut packed_pos, self)?; - self.count[HUFF_CODES_TABLE][code_size as usize] = - self.count[HUFF_CODES_TABLE][code_size as usize].wrapping_add(1); - write(&[code_size], &mut packed_code_sizes, &mut packed_pos)?; - } else { - rle.repeat_count += 1; - if rle.repeat_count == 6 { - rle.prev_code_size(&mut packed_code_sizes, &mut packed_pos, self)?; - } - } - } - rle.prev_code_size = code_size; - } - - if rle.repeat_count != 0 { - rle.prev_code_size(&mut packed_code_sizes, &mut packed_pos, self)?; - } else { - rle.zero_code_size(&mut packed_code_sizes, &mut packed_pos, self)?; - } - - self.optimize_table(2, MAX_HUFF_SYMBOLS_2, 7, false); - - output.put_bits(2, 2); - - output.put_bits((num_lit_codes - 257) as u32, 5); - output.put_bits((num_dist_codes - 1) as u32, 5); - - let mut num_bit_lengths = 18 - - HUFFMAN_LENGTH_ORDER - .iter() - .rev() - .take_while(|&swizzle| self.code_sizes[HUFF_CODES_TABLE][*swizzle as usize] == 0) - .count(); - - num_bit_lengths = cmp::max(4, num_bit_lengths + 1); - output.put_bits(num_bit_lengths as u32 - 4, 4); - for &swizzle in &HUFFMAN_LENGTH_ORDER[..num_bit_lengths] { - output.put_bits( - u32::from(self.code_sizes[HUFF_CODES_TABLE][swizzle as usize]), - 3, - ); - } - - let mut packed_code_size_index = 0; - while packed_code_size_index < packed_pos { - let code = packed_code_sizes[packed_code_size_index] as usize; - packed_code_size_index += 1; - assert!(code < MAX_HUFF_SYMBOLS_2); - output.put_bits( - u32::from(self.codes[HUFF_CODES_TABLE][code]), - u32::from(self.code_sizes[HUFF_CODES_TABLE][code]), - ); - if code >= 16 { - output.put_bits( - u32::from(packed_code_sizes[packed_code_size_index]), - [2, 3, 7][code - 16], - ); - packed_code_size_index += 1; - } - } - - Ok(()) - } -} - -struct DictOxide { - /// The maximum number of checks in the hash chain, for the initial, - /// and the lazy match respectively. - pub max_probes: [u32; 2], - /// Buffer of input data. - /// Padded with 1 byte to simplify matching code in `compress_fast`. - pub b: Box<HashBuffers>, - - pub code_buf_dict_pos: usize, - pub lookahead_size: usize, - pub lookahead_pos: usize, - pub size: usize, -} - -const fn probes_from_flags(flags: u32) -> [u32; 2] { - [ - 1 + ((flags & 0xFFF) + 2) / 3, - 1 + (((flags & 0xFFF) >> 2) + 2) / 3, - ] -} - -impl DictOxide { - fn new(flags: u32) -> Self { - DictOxide { - max_probes: probes_from_flags(flags), - b: Box::default(), - code_buf_dict_pos: 0, - lookahead_size: 0, - lookahead_pos: 0, - size: 0, - } - } - - fn update_flags(&mut self, flags: u32) { - self.max_probes = probes_from_flags(flags); - } - - fn reset(&mut self) { - self.b.reset(); - self.code_buf_dict_pos = 0; - self.lookahead_size = 0; - self.lookahead_pos = 0; - self.size = 0; - } - - /// Do an unaligned read of the data at `pos` in the dictionary and treat it as if it was of - /// type T. - #[inline] - fn read_unaligned_u32(&self, pos: usize) -> u32 { - // Masking the value here helps avoid bounds checks. - let pos = (pos & LZ_DICT_SIZE_MASK) as usize; - let end = pos + 4; - // Somehow this assertion makes things faster. - assert!(end < LZ_DICT_FULL_SIZE); - - let bytes: [u8; 4] = self.b.dict[pos..end].try_into().unwrap(); - u32::from_le_bytes(bytes) - } - - /// Do an unaligned read of the data at `pos` in the dictionary and treat it as if it was of - /// type T. - #[inline] - fn read_unaligned_u64(&self, pos: usize) -> u64 { - let pos = pos as usize; - let bytes: [u8; 8] = self.b.dict[pos..pos + 8].try_into().unwrap(); - u64::from_le_bytes(bytes) - } - - /// Do an unaligned read of the data at `pos` in the dictionary and treat it as if it was of - /// type T. - #[inline] - fn read_as_u16(&self, pos: usize) -> u16 { - read_u16_le(&self.b.dict[..], pos) - } - - /// Try to find a match for the data at lookahead_pos in the dictionary that is - /// longer than `match_len`. - /// Returns a tuple containing (match_distance, match_length). Will be equal to the input - /// values if no better matches were found. - fn find_match( - &self, - lookahead_pos: usize, - max_dist: usize, - max_match_len: u32, - mut match_dist: u32, - mut match_len: u32, - ) -> (u32, u32) { - // Clamp the match len and max_match_len to be valid. (It should be when this is called, but - // do it for now just in case for safety reasons.) - // This should normally end up as at worst conditional moves, - // so it shouldn't slow us down much. - // TODO: Statically verify these so we don't need to do this. - let max_match_len = cmp::min(MAX_MATCH_LEN as u32, max_match_len); - match_len = cmp::max(match_len, 1); - - let pos = lookahead_pos as usize & LZ_DICT_SIZE_MASK; - let mut probe_pos = pos; - // Number of probes into the hash chains. - let mut num_probes_left = self.max_probes[(match_len >= 32) as usize]; - - // If we already have a match of the full length don't bother searching for another one. - if max_match_len <= match_len { - return (match_dist, match_len); - } - - // Read the last byte of the current match, and the next one, used to compare matches. - let mut c01: u16 = self.read_as_u16(pos as usize + match_len as usize - 1); - // Read the two bytes at the end position of the current match. - let s01: u16 = self.read_as_u16(pos as usize); - - 'outer: loop { - let mut dist; - 'found: loop { - num_probes_left -= 1; - if num_probes_left == 0 { - // We have done as many probes in the hash chain as the current compression - // settings allow, so return the best match we found, if any. - return (match_dist, match_len); - } - - for _ in 0..3 { - let next_probe_pos = self.b.next[probe_pos as usize] as usize; - - dist = (lookahead_pos - next_probe_pos) & 0xFFFF; - if next_probe_pos == 0 || dist > max_dist { - // We reached the end of the hash chain, or the next value is further away - // than the maximum allowed distance, so return the best match we found, if - // any. - return (match_dist, match_len); - } - - // Mask the position value to get the position in the hash chain of the next - // position to match against. - probe_pos = next_probe_pos & LZ_DICT_SIZE_MASK; - - if self.read_as_u16((probe_pos + match_len as usize - 1) as usize) == c01 { - break 'found; - } - } - } - - if dist == 0 { - // We've looked through the whole match range, so return the best match we - // found. - return (match_dist, match_len); - } - - // Check if the two first bytes match. - if self.read_as_u16(probe_pos as usize) != s01 { - continue; - } - - let mut p = pos + 2; - let mut q = probe_pos + 2; - // The first two bytes matched, so check the full length of the match. - for _ in 0..32 { - let p_data: u64 = self.read_unaligned_u64(p); - let q_data: u64 = self.read_unaligned_u64(q); - // Compare of 8 bytes at a time by using unaligned loads of 64-bit integers. - let xor_data = p_data ^ q_data; - if xor_data == 0 { - p += 8; - q += 8; - } else { - // If not all of the last 8 bytes matched, check how may of them did. - let trailing = xor_data.trailing_zeros(); - - let probe_len = p - pos + (trailing as usize >> 3); - if probe_len > match_len as usize { - match_dist = dist as u32; - match_len = cmp::min(max_match_len, probe_len as u32); - if match_len == max_match_len { - // We found a match that had the maximum allowed length, - // so there is now point searching further. - return (match_dist, match_len); - } - // We found a better match, so save the last two bytes for further match - // comparisons. - c01 = self.read_as_u16(pos + match_len as usize - 1) - } - continue 'outer; - } - } - - return (dist as u32, cmp::min(max_match_len, MAX_MATCH_LEN as u32)); - } - } -} - -struct ParamsOxide { - pub flags: u32, - pub greedy_parsing: bool, - pub block_index: u32, - - pub saved_match_dist: u32, - pub saved_match_len: u32, - pub saved_lit: u8, - - pub flush: TDEFLFlush, - pub flush_ofs: u32, - pub flush_remaining: u32, - pub finished: bool, - - pub adler32: u32, - - pub src_pos: usize, - - pub out_buf_ofs: usize, - pub prev_return_status: TDEFLStatus, - - pub saved_bit_buffer: u32, - pub saved_bits_in: u32, - - pub local_buf: Box<LocalBuf>, -} - -impl ParamsOxide { - fn new(flags: u32) -> Self { - ParamsOxide { - flags, - greedy_parsing: flags & TDEFL_GREEDY_PARSING_FLAG != 0, - block_index: 0, - saved_match_dist: 0, - saved_match_len: 0, - saved_lit: 0, - flush: TDEFLFlush::None, - flush_ofs: 0, - flush_remaining: 0, - finished: false, - adler32: MZ_ADLER32_INIT, - src_pos: 0, - out_buf_ofs: 0, - prev_return_status: TDEFLStatus::Okay, - saved_bit_buffer: 0, - saved_bits_in: 0, - local_buf: Box::default(), - } - } - - fn update_flags(&mut self, flags: u32) { - self.flags = flags; - self.greedy_parsing = self.flags & TDEFL_GREEDY_PARSING_FLAG != 0; - } - - /// Reset state, saving settings. - fn reset(&mut self) { - self.block_index = 0; - self.saved_match_len = 0; - self.saved_match_dist = 0; - self.saved_lit = 0; - self.flush = TDEFLFlush::None; - self.flush_ofs = 0; - self.flush_remaining = 0; - self.finished = false; - self.adler32 = MZ_ADLER32_INIT; - self.src_pos = 0; - self.out_buf_ofs = 0; - self.prev_return_status = TDEFLStatus::Okay; - self.saved_bit_buffer = 0; - self.saved_bits_in = 0; - self.local_buf.b = [0; OUT_BUF_SIZE]; - } -} - -struct LZOxide { - pub codes: [u8; LZ_CODE_BUF_SIZE], - pub code_position: usize, - pub flag_position: usize, - - // The total number of bytes in the current block. - // (Could maybe use usize, but it's not possible to exceed a block size of ) - pub total_bytes: u32, - pub num_flags_left: u32, -} - -impl LZOxide { - const fn new() -> Self { - LZOxide { - codes: [0; LZ_CODE_BUF_SIZE], - code_position: 1, - flag_position: 0, - total_bytes: 0, - num_flags_left: 8, - } - } - - fn write_code(&mut self, val: u8) { - self.codes[self.code_position] = val; - self.code_position += 1; - } - - fn init_flag(&mut self) { - if self.num_flags_left == 8 { - *self.get_flag() = 0; - self.code_position -= 1; - } else { - *self.get_flag() >>= self.num_flags_left; - } - } - - fn get_flag(&mut self) -> &mut u8 { - &mut self.codes[self.flag_position] - } - - fn plant_flag(&mut self) { - self.flag_position = self.code_position; - self.code_position += 1; - } - - fn consume_flag(&mut self) { - self.num_flags_left -= 1; - if self.num_flags_left == 0 { - self.num_flags_left = 8; - self.plant_flag(); - } - } -} - -fn compress_lz_codes( - huff: &HuffmanOxide, - output: &mut OutputBufferOxide, - lz_code_buf: &[u8], -) -> Result<bool> { - let mut flags = 1; - let mut bb = BitBuffer { - bit_buffer: u64::from(output.bit_buffer), - bits_in: output.bits_in, - }; - - let mut i: usize = 0; - while i < lz_code_buf.len() { - if flags == 1 { - flags = u32::from(lz_code_buf[i]) | 0x100; - i += 1; - } - - // The lz code was a length code - if flags & 1 == 1 { - flags >>= 1; - - let sym; - let num_extra_bits; - - let match_len = lz_code_buf[i] as usize; - - let match_dist = read_u16_le(lz_code_buf, i + 1); - - i += 3; - - debug_assert!(huff.code_sizes[0][LEN_SYM[match_len] as usize] != 0); - bb.put_fast( - u64::from(huff.codes[0][LEN_SYM[match_len] as usize]), - u32::from(huff.code_sizes[0][LEN_SYM[match_len] as usize]), - ); - bb.put_fast( - match_len as u64 & u64::from(BITMASKS[LEN_EXTRA[match_len] as usize]), - u32::from(LEN_EXTRA[match_len]), - ); - - if match_dist < 512 { - sym = SMALL_DIST_SYM[match_dist as usize] as usize; - num_extra_bits = SMALL_DIST_EXTRA[match_dist as usize] as usize; - } else { - sym = LARGE_DIST_SYM[(match_dist >> 8) as usize] as usize; - num_extra_bits = LARGE_DIST_EXTRA[(match_dist >> 8) as usize] as usize; - } - - debug_assert!(huff.code_sizes[1][sym] != 0); - bb.put_fast( - u64::from(huff.codes[1][sym]), - u32::from(huff.code_sizes[1][sym]), - ); - bb.put_fast( - u64::from(match_dist) & u64::from(BITMASKS[num_extra_bits as usize]), - num_extra_bits as u32, - ); - } else { - // The lz code was a literal - for _ in 0..3 { - flags >>= 1; - let lit = lz_code_buf[i]; - i += 1; - - debug_assert!(huff.code_sizes[0][lit as usize] != 0); - bb.put_fast( - u64::from(huff.codes[0][lit as usize]), - u32::from(huff.code_sizes[0][lit as usize]), - ); - - if flags & 1 == 1 || i >= lz_code_buf.len() { - break; - } - } - } - - bb.flush(output)?; - } - - output.bits_in = 0; - output.bit_buffer = 0; - while bb.bits_in != 0 { - let n = cmp::min(bb.bits_in, 16); - output.put_bits(bb.bit_buffer as u32 & BITMASKS[n as usize], n); - bb.bit_buffer >>= n; - bb.bits_in -= n; - } - - // Output the end of block symbol. - output.put_bits( - u32::from(huff.codes[0][256]), - u32::from(huff.code_sizes[0][256]), - ); - - Ok(true) -} - -fn compress_block( - huff: &mut HuffmanOxide, - output: &mut OutputBufferOxide, - lz: &LZOxide, - static_block: bool, -) -> Result<bool> { - if static_block { - huff.start_static_block(output); - } else { - huff.start_dynamic_block(output)?; - } - - compress_lz_codes(huff, output, &lz.codes[..lz.code_position]) -} - -fn flush_block( - d: &mut CompressorOxide, - callback: &mut CallbackOxide, - flush: TDEFLFlush, -) -> Result<i32> { - let mut saved_buffer; - { - let mut output = callback - .out - .new_output_buffer(&mut d.params.local_buf.b, d.params.out_buf_ofs); - output.bit_buffer = d.params.saved_bit_buffer; - output.bits_in = d.params.saved_bits_in; - - let use_raw_block = (d.params.flags & TDEFL_FORCE_ALL_RAW_BLOCKS != 0) - && (d.dict.lookahead_pos - d.dict.code_buf_dict_pos) <= d.dict.size; - - assert!(d.params.flush_remaining == 0); - d.params.flush_ofs = 0; - d.params.flush_remaining = 0; - - d.lz.init_flag(); - - // If we are at the start of the stream, write the zlib header if requested. - if d.params.flags & TDEFL_WRITE_ZLIB_HEADER != 0 && d.params.block_index == 0 { - let header = zlib::header_from_flags(d.params.flags as u32); - output.put_bits(header[0].into(), 8); - output.put_bits(header[1].into(), 8); - } - - // Output the block header. - output.put_bits((flush == TDEFLFlush::Finish) as u32, 1); - - saved_buffer = output.save(); - - let comp_success = if !use_raw_block { - let use_static = - (d.params.flags & TDEFL_FORCE_ALL_STATIC_BLOCKS != 0) || (d.lz.total_bytes < 48); - compress_block(&mut d.huff, &mut output, &d.lz, use_static)? - } else { - false - }; - - // If we failed to compress anything and the output would take up more space than the output - // data, output a stored block instead, which has at most 5 bytes of overhead. - // We only use some simple heuristics for now. - // A stored block will have an overhead of at least 4 bytes containing the block length - // but usually more due to the length parameters having to start at a byte boundary and thus - // requiring up to 5 bytes of padding. - // As a static block will have an overhead of at most 1 bit per byte - // (as literals are either 8 or 9 bytes), a raw block will - // never take up less space if the number of input bytes are less than 32. - let expanded = (d.lz.total_bytes > 32) - && (output.inner_pos - saved_buffer.pos + 1 >= (d.lz.total_bytes as usize)) - && (d.dict.lookahead_pos - d.dict.code_buf_dict_pos <= d.dict.size); - - if use_raw_block || expanded { - output.load(saved_buffer); - - // Block header. - output.put_bits(0, 2); - - // Block length has to start on a byte boundary, s opad. - output.pad_to_bytes(); - - // Block length and ones complement of block length. - output.put_bits(d.lz.total_bytes & 0xFFFF, 16); - output.put_bits(!d.lz.total_bytes & 0xFFFF, 16); - - // Write the actual bytes. - for i in 0..d.lz.total_bytes { - let pos = (d.dict.code_buf_dict_pos + i as usize) & LZ_DICT_SIZE_MASK; - output.put_bits(u32::from(d.dict.b.dict[pos as usize]), 8); - } - } else if !comp_success { - output.load(saved_buffer); - compress_block(&mut d.huff, &mut output, &d.lz, true)?; - } - - if flush != TDEFLFlush::None { - if flush == TDEFLFlush::Finish { - output.pad_to_bytes(); - if d.params.flags & TDEFL_WRITE_ZLIB_HEADER != 0 { - let mut adler = d.params.adler32; - for _ in 0..4 { - output.put_bits((adler >> 24) & 0xFF, 8); - adler <<= 8; - } - } - } else { - // Sync or Full flush. - // Output an empty raw block. - output.put_bits(0, 3); - output.pad_to_bytes(); - output.put_bits(0, 16); - output.put_bits(0xFFFF, 16); - } - } - - memset(&mut d.huff.count[0][..MAX_HUFF_SYMBOLS_0], 0); - memset(&mut d.huff.count[1][..MAX_HUFF_SYMBOLS_1], 0); - - d.lz.code_position = 1; - d.lz.flag_position = 0; - d.lz.num_flags_left = 8; - d.dict.code_buf_dict_pos += d.lz.total_bytes as usize; - d.lz.total_bytes = 0; - d.params.block_index += 1; - - saved_buffer = output.save(); - - d.params.saved_bit_buffer = saved_buffer.bit_buffer; - d.params.saved_bits_in = saved_buffer.bits_in; - } - - Ok(callback.flush_output(saved_buffer, &mut d.params)) -} - -fn record_literal(h: &mut HuffmanOxide, lz: &mut LZOxide, lit: u8) { - lz.total_bytes += 1; - lz.write_code(lit); - - *lz.get_flag() >>= 1; - lz.consume_flag(); - - h.count[0][lit as usize] += 1; -} - -fn record_match(h: &mut HuffmanOxide, lz: &mut LZOxide, mut match_len: u32, mut match_dist: u32) { - assert!(match_len >= MIN_MATCH_LEN.into()); - assert!(match_dist >= 1); - assert!(match_dist as usize <= LZ_DICT_SIZE); - - lz.total_bytes += match_len; - match_dist -= 1; - match_len -= u32::from(MIN_MATCH_LEN); - lz.write_code(match_len as u8); - lz.write_code(match_dist as u8); - lz.write_code((match_dist >> 8) as u8); - - *lz.get_flag() >>= 1; - *lz.get_flag() |= 0x80; - lz.consume_flag(); - - let symbol = if match_dist < 512 { - SMALL_DIST_SYM[match_dist as usize] - } else { - LARGE_DIST_SYM[((match_dist >> 8) & 127) as usize] - } as usize; - h.count[1][symbol] += 1; - h.count[0][LEN_SYM[match_len as usize] as usize] += 1; -} - -fn compress_normal(d: &mut CompressorOxide, callback: &mut CallbackOxide) -> bool { - let mut src_pos = d.params.src_pos; - let in_buf = match callback.in_buf { - None => return true, - Some(in_buf) => in_buf, - }; - - let mut lookahead_size = d.dict.lookahead_size; - let mut lookahead_pos = d.dict.lookahead_pos; - let mut saved_lit = d.params.saved_lit; - let mut saved_match_dist = d.params.saved_match_dist; - let mut saved_match_len = d.params.saved_match_len; - - while src_pos < in_buf.len() || (d.params.flush != TDEFLFlush::None && lookahead_size != 0) { - let src_buf_left = in_buf.len() - src_pos; - let num_bytes_to_process = cmp::min(src_buf_left, MAX_MATCH_LEN - lookahead_size as usize); - - if lookahead_size + d.dict.size >= usize::from(MIN_MATCH_LEN) - 1 - && num_bytes_to_process > 0 - { - let dictb = &mut d.dict.b; - - let mut dst_pos = (lookahead_pos + lookahead_size as usize) & LZ_DICT_SIZE_MASK; - let mut ins_pos = lookahead_pos + lookahead_size as usize - 2; - // Start the hash value from the first two bytes - let mut hash = update_hash( - u16::from(dictb.dict[(ins_pos & LZ_DICT_SIZE_MASK) as usize]), - dictb.dict[((ins_pos + 1) & LZ_DICT_SIZE_MASK) as usize], - ); - - lookahead_size += num_bytes_to_process; - - for &c in &in_buf[src_pos..src_pos + num_bytes_to_process] { - // Add byte to input buffer. - dictb.dict[dst_pos as usize] = c; - if (dst_pos as usize) < MAX_MATCH_LEN - 1 { - dictb.dict[LZ_DICT_SIZE + dst_pos as usize] = c; - } - - // Generate hash from the current byte, - hash = update_hash(hash, c); - dictb.next[(ins_pos & LZ_DICT_SIZE_MASK) as usize] = dictb.hash[hash as usize]; - // and insert it into the hash chain. - dictb.hash[hash as usize] = ins_pos as u16; - dst_pos = (dst_pos + 1) & LZ_DICT_SIZE_MASK; - ins_pos += 1; - } - src_pos += num_bytes_to_process; - } else { - let dictb = &mut d.dict.b; - for &c in &in_buf[src_pos..src_pos + num_bytes_to_process] { - let dst_pos = (lookahead_pos + lookahead_size) & LZ_DICT_SIZE_MASK; - dictb.dict[dst_pos as usize] = c; - if (dst_pos as usize) < MAX_MATCH_LEN - 1 { - dictb.dict[LZ_DICT_SIZE + dst_pos as usize] = c; - } - - lookahead_size += 1; - if lookahead_size + d.dict.size >= MIN_MATCH_LEN.into() { - let ins_pos = lookahead_pos + lookahead_size - 3; - let hash = ((u32::from(dictb.dict[(ins_pos & LZ_DICT_SIZE_MASK) as usize]) - << (LZ_HASH_SHIFT * 2)) - ^ ((u32::from(dictb.dict[((ins_pos + 1) & LZ_DICT_SIZE_MASK) as usize]) - << LZ_HASH_SHIFT) - ^ u32::from(c))) - & (LZ_HASH_SIZE as u32 - 1); - - dictb.next[(ins_pos & LZ_DICT_SIZE_MASK) as usize] = dictb.hash[hash as usize]; - dictb.hash[hash as usize] = ins_pos as u16; - } - } - - src_pos += num_bytes_to_process; - } - - d.dict.size = cmp::min(LZ_DICT_SIZE - lookahead_size, d.dict.size); - if d.params.flush == TDEFLFlush::None && (lookahead_size as usize) < MAX_MATCH_LEN { - break; - } - - let mut len_to_move = 1; - let mut cur_match_dist = 0; - let mut cur_match_len = if saved_match_len != 0 { - saved_match_len - } else { - u32::from(MIN_MATCH_LEN) - 1 - }; - let cur_pos = lookahead_pos & LZ_DICT_SIZE_MASK; - if d.params.flags & (TDEFL_RLE_MATCHES | TDEFL_FORCE_ALL_RAW_BLOCKS) != 0 { - // If TDEFL_RLE_MATCHES is set, we only look for repeating sequences of the current byte. - if d.dict.size != 0 && d.params.flags & TDEFL_FORCE_ALL_RAW_BLOCKS == 0 { - let c = d.dict.b.dict[((cur_pos.wrapping_sub(1)) & LZ_DICT_SIZE_MASK) as usize]; - cur_match_len = d.dict.b.dict[cur_pos as usize..(cur_pos + lookahead_size) as usize] - .iter() - .take_while(|&x| *x == c) - .count() as u32; - if cur_match_len < MIN_MATCH_LEN.into() { - cur_match_len = 0 - } else { - cur_match_dist = 1 - } - } - } else { - // Try to find a match for the bytes at the current position. - let dist_len = d.dict.find_match( - lookahead_pos, - d.dict.size, - lookahead_size as u32, - cur_match_dist, - cur_match_len, - ); - cur_match_dist = dist_len.0; - cur_match_len = dist_len.1; - } - - let far_and_small = cur_match_len == MIN_MATCH_LEN.into() && cur_match_dist >= 8 * 1024; - let filter_small = d.params.flags & TDEFL_FILTER_MATCHES != 0 && cur_match_len <= 5; - if far_and_small || filter_small || cur_pos == cur_match_dist as usize { - cur_match_dist = 0; - cur_match_len = 0; - } - - if saved_match_len != 0 { - if cur_match_len > saved_match_len { - record_literal(&mut d.huff, &mut d.lz, saved_lit); - if cur_match_len >= 128 { - record_match(&mut d.huff, &mut d.lz, cur_match_len, cur_match_dist); - saved_match_len = 0; - len_to_move = cur_match_len as usize; - } else { - saved_lit = d.dict.b.dict[cur_pos as usize]; - saved_match_dist = cur_match_dist; - saved_match_len = cur_match_len; - } - } else { - record_match(&mut d.huff, &mut d.lz, saved_match_len, saved_match_dist); - len_to_move = (saved_match_len - 1) as usize; - saved_match_len = 0; - } - } else if cur_match_dist == 0 { - record_literal( - &mut d.huff, - &mut d.lz, - d.dict.b.dict[cmp::min(cur_pos as usize, d.dict.b.dict.len() - 1)], - ); - } else if d.params.greedy_parsing - || (d.params.flags & TDEFL_RLE_MATCHES != 0) - || cur_match_len >= 128 - { - // If we are using lazy matching, check for matches at the next byte if the current - // match was shorter than 128 bytes. - record_match(&mut d.huff, &mut d.lz, cur_match_len, cur_match_dist); - len_to_move = cur_match_len as usize; - } else { - saved_lit = d.dict.b.dict[cmp::min(cur_pos as usize, d.dict.b.dict.len() - 1)]; - saved_match_dist = cur_match_dist; - saved_match_len = cur_match_len; - } - - lookahead_pos += len_to_move; - assert!(lookahead_size >= len_to_move); - lookahead_size -= len_to_move; - d.dict.size = cmp::min(d.dict.size + len_to_move, LZ_DICT_SIZE); - - let lz_buf_tight = d.lz.code_position > LZ_CODE_BUF_SIZE - 8; - let raw = d.params.flags & TDEFL_FORCE_ALL_RAW_BLOCKS != 0; - let fat = ((d.lz.code_position * 115) >> 7) >= d.lz.total_bytes as usize; - let fat_or_raw = (d.lz.total_bytes > 31 * 1024) && (fat || raw); - - if lz_buf_tight || fat_or_raw { - d.params.src_pos = src_pos; - // These values are used in flush_block, so we need to write them back here. - d.dict.lookahead_size = lookahead_size; - d.dict.lookahead_pos = lookahead_pos; - - let n = flush_block(d, callback, TDEFLFlush::None) - .unwrap_or(TDEFLStatus::PutBufFailed as i32); - if n != 0 { - d.params.saved_lit = saved_lit; - d.params.saved_match_dist = saved_match_dist; - d.params.saved_match_len = saved_match_len; - return n > 0; - } - } - } - - d.params.src_pos = src_pos; - d.dict.lookahead_size = lookahead_size; - d.dict.lookahead_pos = lookahead_pos; - d.params.saved_lit = saved_lit; - d.params.saved_match_dist = saved_match_dist; - d.params.saved_match_len = saved_match_len; - true -} - -const COMP_FAST_LOOKAHEAD_SIZE: usize = 4096; - -fn compress_fast(d: &mut CompressorOxide, callback: &mut CallbackOxide) -> bool { - let mut src_pos = d.params.src_pos; - let mut lookahead_size = d.dict.lookahead_size; - let mut lookahead_pos = d.dict.lookahead_pos; - - let mut cur_pos = lookahead_pos & LZ_DICT_SIZE_MASK; - let in_buf = match callback.in_buf { - None => return true, - Some(in_buf) => in_buf, - }; - - debug_assert!(d.lz.code_position < LZ_CODE_BUF_SIZE - 2); - - while src_pos < in_buf.len() || (d.params.flush != TDEFLFlush::None && lookahead_size > 0) { - let mut dst_pos = ((lookahead_pos + lookahead_size) & LZ_DICT_SIZE_MASK) as usize; - let mut num_bytes_to_process = cmp::min( - in_buf.len() - src_pos, - (COMP_FAST_LOOKAHEAD_SIZE - lookahead_size) as usize, - ); - lookahead_size += num_bytes_to_process; - - while num_bytes_to_process != 0 { - let n = cmp::min(LZ_DICT_SIZE - dst_pos, num_bytes_to_process); - d.dict.b.dict[dst_pos..dst_pos + n].copy_from_slice(&in_buf[src_pos..src_pos + n]); - - if dst_pos < MAX_MATCH_LEN - 1 { - let m = cmp::min(n, MAX_MATCH_LEN - 1 - dst_pos); - d.dict.b.dict[dst_pos + LZ_DICT_SIZE..dst_pos + LZ_DICT_SIZE + m] - .copy_from_slice(&in_buf[src_pos..src_pos + m]); - } - - src_pos += n; - dst_pos = (dst_pos + n) & LZ_DICT_SIZE_MASK as usize; - num_bytes_to_process -= n; - } - - d.dict.size = cmp::min(LZ_DICT_SIZE - lookahead_size, d.dict.size); - if d.params.flush == TDEFLFlush::None && lookahead_size < COMP_FAST_LOOKAHEAD_SIZE { - break; - } - - while lookahead_size >= 4 { - let mut cur_match_len = 1; - - let first_trigram = d.dict.read_unaligned_u32(cur_pos) & 0xFF_FFFF; - - let hash = (first_trigram ^ (first_trigram >> (24 - (LZ_HASH_BITS - 8)))) - & LEVEL1_HASH_SIZE_MASK; - - let mut probe_pos = usize::from(d.dict.b.hash[hash as usize]); - d.dict.b.hash[hash as usize] = lookahead_pos as u16; - - let mut cur_match_dist = (lookahead_pos - probe_pos as usize) as u16; - if cur_match_dist as usize <= d.dict.size { - probe_pos &= LZ_DICT_SIZE_MASK; - - let trigram = d.dict.read_unaligned_u32(probe_pos) & 0xFF_FFFF; - - if first_trigram == trigram { - // Trigram was tested, so we can start with "+ 3" displacement. - let mut p = cur_pos + 3; - let mut q = probe_pos + 3; - cur_match_len = (|| { - for _ in 0..32 { - let p_data: u64 = d.dict.read_unaligned_u64(p); - let q_data: u64 = d.dict.read_unaligned_u64(q); - let xor_data = p_data ^ q_data; - if xor_data == 0 { - p += 8; - q += 8; - } else { - let trailing = xor_data.trailing_zeros(); - return p as u32 - cur_pos as u32 + (trailing >> 3); - } - } - - if cur_match_dist == 0 { - 0 - } else { - MAX_MATCH_LEN as u32 - } - })(); - - if cur_match_len < MIN_MATCH_LEN.into() - || (cur_match_len == MIN_MATCH_LEN.into() && cur_match_dist >= 8 * 1024) - { - let lit = first_trigram as u8; - cur_match_len = 1; - d.lz.write_code(lit); - *d.lz.get_flag() >>= 1; - d.huff.count[0][lit as usize] += 1; - } else { - // Limit the match to the length of the lookahead so we don't create a match - // that ends after the end of the input data. - cur_match_len = cmp::min(cur_match_len, lookahead_size as u32); - debug_assert!(cur_match_len >= MIN_MATCH_LEN.into()); - debug_assert!(cur_match_dist >= 1); - debug_assert!(cur_match_dist as usize <= LZ_DICT_SIZE); - cur_match_dist -= 1; - - d.lz.write_code((cur_match_len - u32::from(MIN_MATCH_LEN)) as u8); - d.lz.write_code(cur_match_dist as u8); - d.lz.write_code((cur_match_dist >> 8) as u8); - - *d.lz.get_flag() >>= 1; - *d.lz.get_flag() |= 0x80; - if cur_match_dist < 512 { - d.huff.count[1][SMALL_DIST_SYM[cur_match_dist as usize] as usize] += 1; - } else { - d.huff.count[1] - [LARGE_DIST_SYM[(cur_match_dist >> 8) as usize] as usize] += 1; - } - - d.huff.count[0][LEN_SYM[(cur_match_len - u32::from(MIN_MATCH_LEN)) as usize] - as usize] += 1; - } - } else { - d.lz.write_code(first_trigram as u8); - *d.lz.get_flag() >>= 1; - d.huff.count[0][first_trigram as u8 as usize] += 1; - } - - d.lz.consume_flag(); - d.lz.total_bytes += cur_match_len; - lookahead_pos += cur_match_len as usize; - d.dict.size = cmp::min(d.dict.size + cur_match_len as usize, LZ_DICT_SIZE); - cur_pos = (cur_pos + cur_match_len as usize) & LZ_DICT_SIZE_MASK; - lookahead_size -= cur_match_len as usize; - - if d.lz.code_position > LZ_CODE_BUF_SIZE - 8 { - // These values are used in flush_block, so we need to write them back here. - d.dict.lookahead_size = lookahead_size; - d.dict.lookahead_pos = lookahead_pos; - - let n = match flush_block(d, callback, TDEFLFlush::None) { - Err(_) => { - d.params.src_pos = src_pos; - d.params.prev_return_status = TDEFLStatus::PutBufFailed; - return false; - } - Ok(status) => status, - }; - if n != 0 { - d.params.src_pos = src_pos; - return n > 0; - } - debug_assert!(d.lz.code_position < LZ_CODE_BUF_SIZE - 2); - - lookahead_size = d.dict.lookahead_size; - lookahead_pos = d.dict.lookahead_pos; - } - } - } - - while lookahead_size != 0 { - let lit = d.dict.b.dict[cur_pos as usize]; - d.lz.total_bytes += 1; - d.lz.write_code(lit); - *d.lz.get_flag() >>= 1; - d.lz.consume_flag(); - - d.huff.count[0][lit as usize] += 1; - lookahead_pos += 1; - d.dict.size = cmp::min(d.dict.size + 1, LZ_DICT_SIZE); - cur_pos = (cur_pos + 1) & LZ_DICT_SIZE_MASK; - lookahead_size -= 1; - - if d.lz.code_position > LZ_CODE_BUF_SIZE - 8 { - // These values are used in flush_block, so we need to write them back here. - d.dict.lookahead_size = lookahead_size; - d.dict.lookahead_pos = lookahead_pos; - - let n = match flush_block(d, callback, TDEFLFlush::None) { - Err(_) => { - d.params.prev_return_status = TDEFLStatus::PutBufFailed; - d.params.src_pos = src_pos; - return false; - } - Ok(status) => status, - }; - if n != 0 { - d.params.src_pos = src_pos; - return n > 0; - } - - lookahead_size = d.dict.lookahead_size; - lookahead_pos = d.dict.lookahead_pos; - } - } - } - - d.params.src_pos = src_pos; - d.dict.lookahead_size = lookahead_size; - d.dict.lookahead_pos = lookahead_pos; - true -} - -fn flush_output_buffer(c: &mut CallbackOxide, p: &mut ParamsOxide) -> (TDEFLStatus, usize, usize) { - let mut res = (TDEFLStatus::Okay, p.src_pos, 0); - if let CallbackOut::Buf(ref mut cb) = c.out { - let n = cmp::min(cb.out_buf.len() - p.out_buf_ofs, p.flush_remaining as usize); - if n != 0 { - (&mut cb.out_buf[p.out_buf_ofs..p.out_buf_ofs + n]) - .copy_from_slice(&p.local_buf.b[p.flush_ofs as usize..p.flush_ofs as usize + n]); - } - p.flush_ofs += n as u32; - p.flush_remaining -= n as u32; - p.out_buf_ofs += n; - res.2 = p.out_buf_ofs; - } - - if p.finished && p.flush_remaining == 0 { - res.0 = TDEFLStatus::Done - } - res -} - -/// Main compression function. Tries to compress as much as possible from `in_buf` and -/// puts compressed output into `out_buf`. -/// -/// The value of `flush` determines if the compressor should attempt to flush all output -/// and alternatively try to finish the stream. -/// -/// Use [`TDEFLFlush::Finish`] on the final call to signal that the stream is finishing. -/// -/// Note that this function does not keep track of whether a flush marker has been output, so -/// if called using [`TDEFLFlush::Sync`], the caller needs to ensure there is enough space in the -/// output buffer if they want to avoid repeated flush markers. -/// See #105 for details. -/// -/// # Returns -/// Returns a tuple containing the current status of the compressor, the current position -/// in the input buffer and the current position in the output buffer. -pub fn compress( - d: &mut CompressorOxide, - in_buf: &[u8], - out_buf: &mut [u8], - flush: TDEFLFlush, -) -> (TDEFLStatus, usize, usize) { - compress_inner( - d, - &mut CallbackOxide::new_callback_buf(in_buf, out_buf), - flush, - ) -} - -/// Main compression function. Callbacks output. -/// -/// # Returns -/// Returns a tuple containing the current status of the compressor, the current position -/// in the input buffer. -/// -/// The caller is responsible for ensuring the `CallbackFunc` struct will not cause undefined -/// behaviour. -pub fn compress_to_output( - d: &mut CompressorOxide, - in_buf: &[u8], - flush: TDEFLFlush, - mut callback_func: impl FnMut(&[u8]) -> bool, -) -> (TDEFLStatus, usize) { - let res = compress_inner( - d, - &mut CallbackOxide::new_callback_func( - in_buf, - CallbackFunc { - put_buf_func: &mut callback_func, - }, - ), - flush, - ); - - (res.0, res.1) -} - -fn compress_inner( - d: &mut CompressorOxide, - callback: &mut CallbackOxide, - flush: TDEFLFlush, -) -> (TDEFLStatus, usize, usize) { - d.params.out_buf_ofs = 0; - d.params.src_pos = 0; - - let prev_ok = d.params.prev_return_status == TDEFLStatus::Okay; - let flush_finish_once = d.params.flush != TDEFLFlush::Finish || flush == TDEFLFlush::Finish; - - d.params.flush = flush; - if !prev_ok || !flush_finish_once { - d.params.prev_return_status = TDEFLStatus::BadParam; - return (d.params.prev_return_status, 0, 0); - } - - if d.params.flush_remaining != 0 || d.params.finished { - let res = flush_output_buffer(callback, &mut d.params); - d.params.prev_return_status = res.0; - return res; - } - - let one_probe = d.params.flags & MAX_PROBES_MASK as u32 == 1; - let greedy = d.params.flags & TDEFL_GREEDY_PARSING_FLAG != 0; - let filter_or_rle_or_raw = d.params.flags - & (TDEFL_FILTER_MATCHES | TDEFL_FORCE_ALL_RAW_BLOCKS | TDEFL_RLE_MATCHES) - != 0; - - let compress_success = if one_probe && greedy && !filter_or_rle_or_raw { - compress_fast(d, callback) - } else { - compress_normal(d, callback) - }; - - if !compress_success { - return ( - d.params.prev_return_status, - d.params.src_pos, - d.params.out_buf_ofs, - ); - } - - if let Some(in_buf) = callback.in_buf { - if d.params.flags & (TDEFL_WRITE_ZLIB_HEADER | TDEFL_COMPUTE_ADLER32) != 0 { - d.params.adler32 = update_adler32(d.params.adler32, &in_buf[..d.params.src_pos]); - } - } - - let flush_none = d.params.flush == TDEFLFlush::None; - let in_left = callback.in_buf.map_or(0, |buf| buf.len()) - d.params.src_pos; - let remaining = in_left != 0 || d.params.flush_remaining != 0; - if !flush_none && d.dict.lookahead_size == 0 && !remaining { - let flush = d.params.flush; - match flush_block(d, callback, flush) { - Err(_) => { - d.params.prev_return_status = TDEFLStatus::PutBufFailed; - return ( - d.params.prev_return_status, - d.params.src_pos, - d.params.out_buf_ofs, - ); - } - Ok(x) if x < 0 => { - return ( - d.params.prev_return_status, - d.params.src_pos, - d.params.out_buf_ofs, - ) - } - _ => { - d.params.finished = d.params.flush == TDEFLFlush::Finish; - if d.params.flush == TDEFLFlush::Full { - memset(&mut d.dict.b.hash[..], 0); - memset(&mut d.dict.b.next[..], 0); - d.dict.size = 0; - } - } - } - } - - let res = flush_output_buffer(callback, &mut d.params); - d.params.prev_return_status = res.0; - - res -} - -/// Create a set of compression flags using parameters used by zlib and other compressors. -/// Mainly intended for use with transition from c libraries as it deals with raw integers. -/// -/// # Parameters -/// `level` determines compression level. Clamped to maximum of 10. Negative values result in -/// `CompressionLevel::DefaultLevel`. -/// `window_bits`: Above 0, wraps the stream in a zlib wrapper, 0 or negative for a raw deflate -/// stream. -/// `strategy`: Sets the strategy if this conforms to any of the values in `CompressionStrategy`. -/// -/// # Notes -/// This function may be removed or moved to the `miniz_oxide_c_api` in the future. -pub fn create_comp_flags_from_zip_params(level: i32, window_bits: i32, strategy: i32) -> u32 { - let num_probes = (if level >= 0 { - cmp::min(10, level) - } else { - CompressionLevel::DefaultLevel as i32 - }) as usize; - let greedy = if level <= 3 { - TDEFL_GREEDY_PARSING_FLAG - } else { - 0 - }; - let mut comp_flags = NUM_PROBES[num_probes] | greedy; - - if window_bits > 0 { - comp_flags |= TDEFL_WRITE_ZLIB_HEADER; - } - - if level == 0 { - comp_flags |= TDEFL_FORCE_ALL_RAW_BLOCKS; - } else if strategy == CompressionStrategy::Filtered as i32 { - comp_flags |= TDEFL_FILTER_MATCHES; - } else if strategy == CompressionStrategy::HuffmanOnly as i32 { - comp_flags &= !MAX_PROBES_MASK as u32; - } else if strategy == CompressionStrategy::Fixed as i32 { - comp_flags |= TDEFL_FORCE_ALL_STATIC_BLOCKS; - } else if strategy == CompressionStrategy::RLE as i32 { - comp_flags |= TDEFL_RLE_MATCHES; - } - - comp_flags -} - -#[cfg(test)] -mod test { - use super::{ - compress_to_output, create_comp_flags_from_zip_params, read_u16_le, write_u16_le, - CompressionStrategy, CompressorOxide, TDEFLFlush, TDEFLStatus, DEFAULT_FLAGS, - MZ_DEFAULT_WINDOW_BITS, - }; - use crate::inflate::decompress_to_vec; - use alloc::vec; - - #[test] - fn u16_to_slice() { - let mut slice = [0, 0]; - write_u16_le(2000, &mut slice, 0); - assert_eq!(slice, [208, 7]); - } - - #[test] - fn u16_from_slice() { - let mut slice = [208, 7]; - assert_eq!(read_u16_le(&mut slice, 0), 2000); - } - - #[test] - fn compress_output() { - assert_eq!( - DEFAULT_FLAGS, - create_comp_flags_from_zip_params( - 4, - MZ_DEFAULT_WINDOW_BITS, - CompressionStrategy::Default as i32 - ) - ); - - let slice = [ - 1, 2, 3, 4, 1, 2, 3, 1, 2, 3, 1, 2, 6, 1, 2, 3, 1, 2, 3, 2, 3, 1, 2, 3, - ]; - let mut encoded = vec![]; - let flags = create_comp_flags_from_zip_params(6, 0, 0); - let mut d = CompressorOxide::new(flags); - let (status, in_consumed) = - compress_to_output(&mut d, &slice, TDEFLFlush::Finish, |out: &[u8]| { - encoded.extend_from_slice(out); - true - }); - - assert_eq!(status, TDEFLStatus::Done); - assert_eq!(in_consumed, slice.len()); - - let decoded = decompress_to_vec(&encoded[..]).unwrap(); - assert_eq!(&decoded[..], &slice[..]); - } - - #[test] - /// Check fast compress mode - fn compress_fast() { - let slice = [ - 1, 2, 3, 4, 1, 2, 3, 1, 2, 3, 1, 2, 6, 1, 2, 3, 1, 2, 3, 2, 3, 1, 2, 3, - ]; - let mut encoded = vec![]; - let flags = create_comp_flags_from_zip_params(1, 0, 0); - let mut d = CompressorOxide::new(flags); - let (status, in_consumed) = - compress_to_output(&mut d, &slice, TDEFLFlush::Finish, |out: &[u8]| { - encoded.extend_from_slice(out); - true - }); - - assert_eq!(status, TDEFLStatus::Done); - assert_eq!(in_consumed, slice.len()); - - // Needs to be altered if algorithm improves. - assert_eq!( - &encoded[..], - [99, 100, 98, 102, 1, 98, 48, 98, 3, 147, 204, 76, 204, 140, 76, 204, 0] - ); - - let decoded = decompress_to_vec(&encoded[..]).unwrap(); - assert_eq!(&decoded[..], &slice[..]); - } -} diff --git a/vendor/miniz_oxide/src/deflate/mod.rs b/vendor/miniz_oxide/src/deflate/mod.rs deleted file mode 100644 index 471b94b..0000000 --- a/vendor/miniz_oxide/src/deflate/mod.rs +++ /dev/null @@ -1,227 +0,0 @@ -//! This module contains functionality for compression. - -use crate::alloc::vec; -use crate::alloc::vec::Vec; - -mod buffer; -pub mod core; -pub mod stream; -use self::core::*; - -/// How much processing the compressor should do to compress the data. -/// `NoCompression` and `Bestspeed` have special meanings, the other levels determine the number -/// of checks for matches in the hash chains and whether to use lazy or greedy parsing. -#[repr(i32)] -#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)] -pub enum CompressionLevel { - /// Don't do any compression, only output uncompressed blocks. - NoCompression = 0, - /// Fast compression. Uses a special compression routine that is optimized for speed. - BestSpeed = 1, - /// Slow/high compression. Do a lot of checks to try to find good matches. - BestCompression = 9, - /// Even more checks, can be very slow. - UberCompression = 10, - /// Default compromise between speed and compression. - DefaultLevel = 6, - /// Use the default compression level. - DefaultCompression = -1, -} - -// Missing safe rust analogue (this and mem-to-mem are quite similar) -/* -fn tdefl_compress( - d: Option<&mut CompressorOxide>, - in_buf: *const c_void, - in_size: Option<&mut usize>, - out_buf: *mut c_void, - out_size: Option<&mut usize>, - flush: TDEFLFlush, -) -> TDEFLStatus { - let res = match d { - None => { - in_size.map(|size| *size = 0); - out_size.map(|size| *size = 0); - (TDEFLStatus::BadParam, 0, 0) - }, - Some(compressor) => { - let callback_res = CallbackOxide::new( - compressor.callback_func.clone(), - in_buf, - in_size, - out_buf, - out_size, - ); - - if let Ok(mut callback) = callback_res { - let res = compress(compressor, &mut callback, flush); - callback.update_size(Some(res.1), Some(res.2)); - res - } else { - (TDEFLStatus::BadParam, 0, 0) - } - } - }; - res.0 -}*/ - -// Missing safe rust analogue -/* -fn tdefl_init( - d: Option<&mut CompressorOxide>, - put_buf_func: PutBufFuncPtr, - put_buf_user: *mut c_void, - flags: c_int, -) -> TDEFLStatus { - if let Some(d) = d { - *d = CompressorOxide::new( - put_buf_func.map(|func| - CallbackFunc { put_buf_func: func, put_buf_user: put_buf_user } - ), - flags as u32, - ); - TDEFLStatus::Okay - } else { - TDEFLStatus::BadParam - } -}*/ - -// Missing safe rust analogue (though maybe best served by flate2 front-end instead) -/* -fn tdefl_compress_mem_to_output( - buf: *const c_void, - buf_len: usize, - put_buf_func: PutBufFuncPtr, - put_buf_user: *mut c_void, - flags: c_int, -) -> bool*/ - -// Missing safe Rust analogue -/* -fn tdefl_compress_mem_to_mem( - out_buf: *mut c_void, - out_buf_len: usize, - src_buf: *const c_void, - src_buf_len: usize, - flags: c_int, -) -> usize*/ - -/// Compress the input data to a vector, using the specified compression level (0-10). -pub fn compress_to_vec(input: &[u8], level: u8) -> Vec<u8> { - compress_to_vec_inner(input, level, 0, 0) -} - -/// Compress the input data to a vector, using the specified compression level (0-10), and with a -/// zlib wrapper. -pub fn compress_to_vec_zlib(input: &[u8], level: u8) -> Vec<u8> { - compress_to_vec_inner(input, level, 1, 0) -} - -/// Simple function to compress data to a vec. -fn compress_to_vec_inner(input: &[u8], level: u8, window_bits: i32, strategy: i32) -> Vec<u8> { - // The comp flags function sets the zlib flag if the window_bits parameter is > 0. - let flags = create_comp_flags_from_zip_params(level.into(), window_bits, strategy); - let mut compressor = CompressorOxide::new(flags); - let mut output = vec![0; ::core::cmp::max(input.len() / 2, 2)]; - - let mut in_pos = 0; - let mut out_pos = 0; - loop { - let (status, bytes_in, bytes_out) = compress( - &mut compressor, - &input[in_pos..], - &mut output[out_pos..], - TDEFLFlush::Finish, - ); - - out_pos += bytes_out; - in_pos += bytes_in; - - match status { - TDEFLStatus::Done => { - output.truncate(out_pos); - break; - } - TDEFLStatus::Okay => { - // We need more space, so resize the vector. - if output.len().saturating_sub(out_pos) < 30 { - output.resize(output.len() * 2, 0) - } - } - // Not supposed to happen unless there is a bug. - _ => panic!("Bug! Unexpectedly failed to compress!"), - } - } - - output -} - -#[cfg(test)] -mod test { - use super::{compress_to_vec, compress_to_vec_inner, CompressionStrategy}; - use crate::inflate::decompress_to_vec; - use alloc::vec; - - /// Test deflate example. - /// - /// Check if the encoder produces the same code as the example given by Mark Adler here: - /// https://stackoverflow.com/questions/17398931/deflate-encoding-with-static-huffman-codes/17415203 - #[test] - fn compress_small() { - let test_data = b"Deflate late"; - let check = [ - 0x73, 0x49, 0x4d, 0xcb, 0x49, 0x2c, 0x49, 0x55, 0x00, 0x11, 0x00, - ]; - - let res = compress_to_vec(test_data, 1); - assert_eq!(&check[..], res.as_slice()); - - let res = compress_to_vec(test_data, 9); - assert_eq!(&check[..], res.as_slice()); - } - - #[test] - fn compress_huff_only() { - let test_data = b"Deflate late"; - - let res = compress_to_vec_inner(test_data, 1, 0, CompressionStrategy::HuffmanOnly as i32); - let d = decompress_to_vec(res.as_slice()).expect("Failed to decompress!"); - assert_eq!(test_data, d.as_slice()); - } - - /// Test that a raw block compresses fine. - #[test] - fn compress_raw() { - let text = b"Hello, zlib!"; - let encoded = { - let len = text.len(); - let notlen = !len; - let mut encoded = vec![ - 1, - len as u8, - (len >> 8) as u8, - notlen as u8, - (notlen >> 8) as u8, - ]; - encoded.extend_from_slice(&text[..]); - encoded - }; - - let res = compress_to_vec(text, 0); - assert_eq!(encoded, res.as_slice()); - } - - #[test] - fn short() { - let test_data = [10, 10, 10, 10, 10, 55]; - let c = compress_to_vec(&test_data, 9); - - let d = decompress_to_vec(c.as_slice()).expect("Failed to decompress!"); - assert_eq!(&test_data, d.as_slice()); - // Check that a static block is used here, rather than a raw block - // , so the data is actually compressed. - // (The optimal compressed length would be 5, but neither miniz nor zlib manages that either - // as neither checks matches against the byte at index 0.) - assert!(c.len() <= 6); - } -} diff --git a/vendor/miniz_oxide/src/deflate/stream.rs b/vendor/miniz_oxide/src/deflate/stream.rs deleted file mode 100644 index 39aa82d..0000000 --- a/vendor/miniz_oxide/src/deflate/stream.rs +++ /dev/null @@ -1,121 +0,0 @@ -//! Extra streaming compression functionality. -//! -//! As of now this is mainly intended for use to build a higher-level wrapper. -//! -//! There is no DeflateState as the needed state is contained in the compressor struct itself. - -use crate::deflate::core::{compress, CompressorOxide, TDEFLFlush, TDEFLStatus}; -use crate::{MZError, MZFlush, MZStatus, StreamResult}; - -/// Try to compress from input to output with the given [`CompressorOxide`]. -/// -/// # Errors -/// -/// Returns [`MZError::Buf`] If the size of the `output` slice is empty or no progress was made due -/// to lack of expected input data, or if called without [`MZFlush::Finish`] after the compression -/// was already finished. -/// -/// Returns [`MZError::Param`] if the compressor parameters are set wrong. -/// -/// Returns [`MZError::Stream`] when lower-level decompressor returns a -/// [`TDEFLStatus::PutBufFailed`]; may not actually be possible. -pub fn deflate( - compressor: &mut CompressorOxide, - input: &[u8], - output: &mut [u8], - flush: MZFlush, -) -> StreamResult { - if output.is_empty() { - return StreamResult::error(MZError::Buf); - } - - if compressor.prev_return_status() == TDEFLStatus::Done { - return if flush == MZFlush::Finish { - StreamResult { - bytes_written: 0, - bytes_consumed: 0, - status: Ok(MZStatus::StreamEnd), - } - } else { - StreamResult::error(MZError::Buf) - }; - } - - let mut bytes_written = 0; - let mut bytes_consumed = 0; - - let mut next_in = input; - let mut next_out = output; - - let status = loop { - let in_bytes; - let out_bytes; - let defl_status = { - let res = compress(compressor, next_in, next_out, TDEFLFlush::from(flush)); - in_bytes = res.1; - out_bytes = res.2; - res.0 - }; - - next_in = &next_in[in_bytes..]; - next_out = &mut next_out[out_bytes..]; - bytes_consumed += in_bytes; - bytes_written += out_bytes; - - // Check if we are done, or compression failed. - match defl_status { - TDEFLStatus::BadParam => break Err(MZError::Param), - // Don't think this can happen as we're not using a custom callback. - TDEFLStatus::PutBufFailed => break Err(MZError::Stream), - TDEFLStatus::Done => break Ok(MZStatus::StreamEnd), - _ => (), - }; - - // All the output space was used, so wait for more. - if next_out.is_empty() { - break Ok(MZStatus::Ok); - } - - if next_in.is_empty() && (flush != MZFlush::Finish) { - let total_changed = bytes_written > 0 || bytes_consumed > 0; - - break if (flush != MZFlush::None) || total_changed { - // We wrote or consumed something, and/or did a flush (sync/partial etc.). - Ok(MZStatus::Ok) - } else { - // No more input data, not flushing, and nothing was consumed or written, - // so couldn't make any progress. - Err(MZError::Buf) - }; - } - }; - StreamResult { - bytes_consumed, - bytes_written, - status, - } -} - -#[cfg(test)] -mod test { - use super::deflate; - use crate::deflate::CompressorOxide; - use crate::inflate::decompress_to_vec_zlib; - use crate::{MZFlush, MZStatus}; - use alloc::boxed::Box; - use alloc::vec; - - #[test] - fn test_state() { - let data = b"Hello zlib!"; - let mut compressed = vec![0; 50]; - let mut compressor = Box::<CompressorOxide>::default(); - let res = deflate(&mut compressor, data, &mut compressed, MZFlush::Finish); - let status = res.status.expect("Failed to compress!"); - let decomp = - decompress_to_vec_zlib(&compressed).expect("Failed to decompress compressed data"); - assert_eq!(status, MZStatus::StreamEnd); - assert_eq!(decomp[..], data[..]); - assert_eq!(res.bytes_consumed, data.len()); - } -} |