diff options
Diffstat (limited to 'vendor/miniz_oxide/src/inflate')
| -rw-r--r-- | vendor/miniz_oxide/src/inflate/core.rs | 1992 | ||||
| -rw-r--r-- | vendor/miniz_oxide/src/inflate/mod.rs | 337 | ||||
| -rw-r--r-- | vendor/miniz_oxide/src/inflate/output_buffer.rs | 60 | ||||
| -rw-r--r-- | vendor/miniz_oxide/src/inflate/stream.rs | 418 |
4 files changed, 0 insertions, 2807 deletions
diff --git a/vendor/miniz_oxide/src/inflate/core.rs b/vendor/miniz_oxide/src/inflate/core.rs deleted file mode 100644 index 6db2449..0000000 --- a/vendor/miniz_oxide/src/inflate/core.rs +++ /dev/null @@ -1,1992 +0,0 @@ -//! Streaming decompression functionality. - -use super::*; -use crate::shared::{update_adler32, HUFFMAN_LENGTH_ORDER}; - -use ::core::convert::TryInto; -use ::core::{cmp, slice}; - -use self::output_buffer::OutputBuffer; - -pub const TINFL_LZ_DICT_SIZE: usize = 32_768; - -/// A struct containing huffman code lengths and the huffman code tree used by the decompressor. -struct HuffmanTable { - /// Length of the code at each index. - pub code_size: [u8; MAX_HUFF_SYMBOLS_0], - /// Fast lookup table for shorter huffman codes. - /// - /// See `HuffmanTable::fast_lookup`. - pub look_up: [i16; FAST_LOOKUP_SIZE as usize], - /// Full huffman tree. - /// - /// Positive values are edge nodes/symbols, negative values are - /// parent nodes/references to other nodes. - pub tree: [i16; MAX_HUFF_TREE_SIZE], -} - -impl HuffmanTable { - const fn new() -> HuffmanTable { - HuffmanTable { - code_size: [0; MAX_HUFF_SYMBOLS_0], - look_up: [0; FAST_LOOKUP_SIZE as usize], - tree: [0; MAX_HUFF_TREE_SIZE], - } - } - - /// Look for a symbol in the fast lookup table. - /// The symbol is stored in the lower 9 bits, the length in the next 6. - /// If the returned value is negative, the code wasn't found in the - /// fast lookup table and the full tree has to be traversed to find the code. - #[inline] - fn fast_lookup(&self, bit_buf: BitBuffer) -> i16 { - self.look_up[(bit_buf & BitBuffer::from(FAST_LOOKUP_SIZE - 1)) as usize] - } - - /// Get the symbol and the code length from the huffman tree. - #[inline] - fn tree_lookup(&self, fast_symbol: i32, bit_buf: BitBuffer, mut code_len: u32) -> (i32, u32) { - let mut symbol = fast_symbol; - // We step through the tree until we encounter a positive value, which indicates a - // symbol. - loop { - // symbol here indicates the position of the left (0) node, if the next bit is 1 - // we add 1 to the lookup position to get the right node. - symbol = i32::from(self.tree[(!symbol + ((bit_buf >> code_len) & 1) as i32) as usize]); - code_len += 1; - if symbol >= 0 { - break; - } - } - (symbol, code_len) - } - - #[inline] - /// Look up a symbol and code length from the bits in the provided bit buffer. - /// - /// Returns Some(symbol, length) on success, - /// None if the length is 0. - /// - /// It's possible we could avoid checking for 0 if we can guarantee a sane table. - /// TODO: Check if a smaller type for code_len helps performance. - fn lookup(&self, bit_buf: BitBuffer) -> Option<(i32, u32)> { - let symbol = self.fast_lookup(bit_buf).into(); - if symbol >= 0 { - if (symbol >> 9) as u32 != 0 { - Some((symbol, (symbol >> 9) as u32)) - } else { - // Zero-length code. - None - } - } else { - // We didn't get a symbol from the fast lookup table, so check the tree instead. - Some(self.tree_lookup(symbol, bit_buf, FAST_LOOKUP_BITS.into())) - } - } -} - -/// The number of huffman tables used. -const MAX_HUFF_TABLES: usize = 3; -/// The length of the first (literal/length) huffman table. -const MAX_HUFF_SYMBOLS_0: usize = 288; -/// The length of the second (distance) huffman table. -const MAX_HUFF_SYMBOLS_1: usize = 32; -/// The length of the last (huffman code length) huffman table. -const _MAX_HUFF_SYMBOLS_2: usize = 19; -/// The maximum length of a code that can be looked up in the fast lookup table. -const FAST_LOOKUP_BITS: u8 = 10; -/// The size of the fast lookup table. -const FAST_LOOKUP_SIZE: u32 = 1 << FAST_LOOKUP_BITS; -const MAX_HUFF_TREE_SIZE: usize = MAX_HUFF_SYMBOLS_0 * 2; -const LITLEN_TABLE: usize = 0; -const DIST_TABLE: usize = 1; -const HUFFLEN_TABLE: usize = 2; - -/// Flags to [`decompress()`] to control how inflation works. -/// -/// These define bits for a bitmask argument. -pub mod inflate_flags { - /// Should we try to parse a zlib header? - /// - /// If unset, the function will expect an RFC1951 deflate stream. If set, it will expect a - /// RFC1950 zlib wrapper around the deflate stream. - pub const TINFL_FLAG_PARSE_ZLIB_HEADER: u32 = 1; - - /// There will be more input that hasn't been given to the decompressor yet. - /// - /// This is useful when you want to decompress what you have so far, - /// even if you know there is probably more input that hasn't gotten here yet (_e.g._, over a - /// network connection). When [`decompress()`][super::decompress] reaches the end of the input - /// without finding the end of the compressed stream, it will return - /// [`TINFLStatus::NeedsMoreInput`][super::TINFLStatus::NeedsMoreInput] if this is set, - /// indicating that you should get more data before calling again. If not set, it will return - /// [`TINFLStatus::FailedCannotMakeProgress`][super::TINFLStatus::FailedCannotMakeProgress] - /// suggesting the stream is corrupt, since you claimed it was all there. - pub const TINFL_FLAG_HAS_MORE_INPUT: u32 = 2; - - /// The output buffer should not wrap around. - pub const TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF: u32 = 4; - - /// Calculate the adler32 checksum of the output data even if we're not inflating a zlib stream. - /// - /// If [`TINFL_FLAG_IGNORE_ADLER32`] is specified, it will override this. - /// - /// NOTE: Enabling/disabling this between calls to decompress will result in an incorrect - /// checksum. - pub const TINFL_FLAG_COMPUTE_ADLER32: u32 = 8; - - /// Ignore adler32 checksum even if we are inflating a zlib stream. - /// - /// Overrides [`TINFL_FLAG_COMPUTE_ADLER32`] if both are enabled. - /// - /// NOTE: This flag does not exist in miniz as it does not support this and is a - /// custom addition for miniz_oxide. - /// - /// NOTE: Should not be changed from enabled to disabled after decompression has started, - /// this will result in checksum failure (outside the unlikely event where the checksum happens - /// to match anyway). - pub const TINFL_FLAG_IGNORE_ADLER32: u32 = 64; -} - -use self::inflate_flags::*; - -const MIN_TABLE_SIZES: [u16; 3] = [257, 1, 4]; - -#[cfg(target_pointer_width = "64")] -type BitBuffer = u64; - -#[cfg(not(target_pointer_width = "64"))] -type BitBuffer = u32; - -/// Main decompression struct. -/// -pub struct DecompressorOxide { - /// Current state of the decompressor. - state: core::State, - /// Number of bits in the bit buffer. - num_bits: u32, - /// Zlib CMF - z_header0: u32, - /// Zlib FLG - z_header1: u32, - /// Adler32 checksum from the zlib header. - z_adler32: u32, - /// 1 if the current block is the last block, 0 otherwise. - finish: u32, - /// The type of the current block. - block_type: u32, - /// 1 if the adler32 value should be checked. - check_adler32: u32, - /// Last match distance. - dist: u32, - /// Variable used for match length, symbols, and a number of other things. - counter: u32, - /// Number of extra bits for the last length or distance code. - num_extra: u32, - /// Number of entries in each huffman table. - table_sizes: [u32; MAX_HUFF_TABLES], - /// Buffer of input data. - bit_buf: BitBuffer, - /// Huffman tables. - tables: [HuffmanTable; MAX_HUFF_TABLES], - /// Raw block header. - raw_header: [u8; 4], - /// Huffman length codes. - len_codes: [u8; MAX_HUFF_SYMBOLS_0 + MAX_HUFF_SYMBOLS_1 + 137], -} - -impl DecompressorOxide { - /// Create a new tinfl_decompressor with all fields set to 0. - pub fn new() -> DecompressorOxide { - DecompressorOxide::default() - } - - /// Set the current state to `Start`. - #[inline] - pub fn init(&mut self) { - // The rest of the data is reset or overwritten when used. - self.state = core::State::Start; - } - - /// Returns the adler32 checksum of the currently decompressed data. - /// Note: Will return Some(1) if decompressing zlib but ignoring adler32. - #[inline] - pub fn adler32(&self) -> Option<u32> { - if self.state != State::Start && !self.state.is_failure() && self.z_header0 != 0 { - Some(self.check_adler32) - } else { - None - } - } - - /// Returns the adler32 that was read from the zlib header if it exists. - #[inline] - pub fn adler32_header(&self) -> Option<u32> { - if self.state != State::Start && self.state != State::BadZlibHeader && self.z_header0 != 0 { - Some(self.z_adler32) - } else { - None - } - } -} - -impl Default for DecompressorOxide { - /// Create a new tinfl_decompressor with all fields set to 0. - #[inline(always)] - fn default() -> Self { - DecompressorOxide { - state: core::State::Start, - num_bits: 0, - z_header0: 0, - z_header1: 0, - z_adler32: 0, - finish: 0, - block_type: 0, - check_adler32: 0, - dist: 0, - counter: 0, - num_extra: 0, - table_sizes: [0; MAX_HUFF_TABLES], - bit_buf: 0, - // TODO:(oyvindln) Check that copies here are optimized out in release mode. - tables: [ - HuffmanTable::new(), - HuffmanTable::new(), - HuffmanTable::new(), - ], - raw_header: [0; 4], - len_codes: [0; MAX_HUFF_SYMBOLS_0 + MAX_HUFF_SYMBOLS_1 + 137], - } - } -} - -#[derive(Copy, Clone, PartialEq, Eq, Debug)] -#[non_exhaustive] -enum State { - Start = 0, - ReadZlibCmf, - ReadZlibFlg, - ReadBlockHeader, - BlockTypeNoCompression, - RawHeader, - RawMemcpy1, - RawMemcpy2, - ReadTableSizes, - ReadHufflenTableCodeSize, - ReadLitlenDistTablesCodeSize, - ReadExtraBitsCodeSize, - DecodeLitlen, - WriteSymbol, - ReadExtraBitsLitlen, - DecodeDistance, - ReadExtraBitsDistance, - RawReadFirstByte, - RawStoreFirstByte, - WriteLenBytesToEnd, - BlockDone, - HuffDecodeOuterLoop1, - HuffDecodeOuterLoop2, - ReadAdler32, - - DoneForever, - - // Failure states. - BlockTypeUnexpected, - BadCodeSizeSum, - BadDistOrLiteralTableLength, - BadTotalSymbols, - BadZlibHeader, - DistanceOutOfBounds, - BadRawLength, - BadCodeSizeDistPrevLookup, - InvalidLitlen, - InvalidDist, - InvalidCodeLen, -} - -impl State { - fn is_failure(self) -> bool { - match self { - BlockTypeUnexpected => true, - BadCodeSizeSum => true, - BadDistOrLiteralTableLength => true, - BadTotalSymbols => true, - BadZlibHeader => true, - DistanceOutOfBounds => true, - BadRawLength => true, - BadCodeSizeDistPrevLookup => true, - InvalidLitlen => true, - InvalidDist => true, - _ => false, - } - } - - #[inline] - fn begin(&mut self, new_state: State) { - *self = new_state; - } -} - -use self::State::*; - -// Not sure why miniz uses 32-bit values for these, maybe alignment/cache again? -// # Optimization -// We add a extra value at the end and make the tables 32 elements long -// so we can use a mask to avoid bounds checks. -// The invalid values are set to something high enough to avoid underflowing -// the match length. -/// Base length for each length code. -/// -/// The base is used together with the value of the extra bits to decode the actual -/// length/distance values in a match. -#[rustfmt::skip] -const LENGTH_BASE: [u16; 32] = [ - 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, - 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 512, 512, 512 -]; - -/// Number of extra bits for each length code. -#[rustfmt::skip] -const LENGTH_EXTRA: [u8; 32] = [ - 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, - 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 0, 0, 0 -]; - -/// Base length for each distance code. -#[rustfmt::skip] -const DIST_BASE: [u16; 32] = [ - 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, - 49, 65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, - 2049, 3073, 4097, 6145, 8193, 12_289, 16_385, 24_577, 32_768, 32_768 -]; - -/// Number of extra bits for each distance code. -#[rustfmt::skip] -const DIST_EXTRA: [u8; 32] = [ - 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, - 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 13, 13 -]; - -/// The mask used when indexing the base/extra arrays. -const BASE_EXTRA_MASK: usize = 32 - 1; - -/// Sets the value of all the elements of the slice to `val`. -#[inline] -fn memset<T: Copy>(slice: &mut [T], val: T) { - for x in slice { - *x = val - } -} - -/// Read an le u16 value from the slice iterator. -/// -/// # Panics -/// Panics if there are less than two bytes left. -#[inline] -fn read_u16_le(iter: &mut slice::Iter<u8>) -> u16 { - let ret = { - let two_bytes = iter.as_ref()[..2].try_into().unwrap(); - u16::from_le_bytes(two_bytes) - }; - iter.nth(1); - ret -} - -/// Read an le u32 value from the slice iterator. -/// -/// # Panics -/// Panics if there are less than four bytes left. -#[inline(always)] -#[cfg(target_pointer_width = "64")] -fn read_u32_le(iter: &mut slice::Iter<u8>) -> u32 { - let ret = { - let four_bytes: [u8; 4] = iter.as_ref()[..4].try_into().unwrap(); - u32::from_le_bytes(four_bytes) - }; - iter.nth(3); - ret -} - -/// Ensure that there is data in the bit buffer. -/// -/// On 64-bit platform, we use a 64-bit value so this will -/// result in there being at least 32 bits in the bit buffer. -/// This function assumes that there is at least 4 bytes left in the input buffer. -#[inline(always)] -#[cfg(target_pointer_width = "64")] -fn fill_bit_buffer(l: &mut LocalVars, in_iter: &mut slice::Iter<u8>) { - // Read four bytes into the buffer at once. - if l.num_bits < 30 { - l.bit_buf |= BitBuffer::from(read_u32_le(in_iter)) << l.num_bits; - l.num_bits += 32; - } -} - -/// Same as previous, but for non-64-bit platforms. -/// Ensures at least 16 bits are present, requires at least 2 bytes in the in buffer. -#[inline(always)] -#[cfg(not(target_pointer_width = "64"))] -fn fill_bit_buffer(l: &mut LocalVars, in_iter: &mut slice::Iter<u8>) { - // If the buffer is 32-bit wide, read 2 bytes instead. - if l.num_bits < 15 { - l.bit_buf |= BitBuffer::from(read_u16_le(in_iter)) << l.num_bits; - l.num_bits += 16; - } -} - -/// Check that the zlib header is correct and that there is enough space in the buffer -/// for the window size specified in the header. -/// -/// See https://tools.ietf.org/html/rfc1950 -#[inline] -fn validate_zlib_header(cmf: u32, flg: u32, flags: u32, mask: usize) -> Action { - let mut failed = - // cmf + flg should be divisible by 31. - (((cmf * 256) + flg) % 31 != 0) || - // If this flag is set, a dictionary was used for this zlib compressed data. - // This is currently not supported by miniz or miniz-oxide - ((flg & 0b0010_0000) != 0) || - // Compression method. Only 8(DEFLATE) is defined by the standard. - ((cmf & 15) != 8); - - let window_size = 1 << ((cmf >> 4) + 8); - if (flags & TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF) == 0 { - // Bail if the buffer is wrapping and the window size is larger than the buffer. - failed |= (mask + 1) < window_size; - } - - // Zlib doesn't allow window sizes above 32 * 1024. - failed |= window_size > 32_768; - - if failed { - Action::Jump(BadZlibHeader) - } else { - Action::Jump(ReadBlockHeader) - } -} - -enum Action { - None, - Jump(State), - End(TINFLStatus), -} - -/// Try to decode the next huffman code, and puts it in the counter field of the decompressor -/// if successful. -/// -/// # Returns -/// The specified action returned from `f` on success, -/// `Action::End` if there are not enough data left to decode a symbol. -fn decode_huffman_code<F>( - r: &mut DecompressorOxide, - l: &mut LocalVars, - table: usize, - flags: u32, - in_iter: &mut slice::Iter<u8>, - f: F, -) -> Action -where - F: FnOnce(&mut DecompressorOxide, &mut LocalVars, i32) -> Action, -{ - // As the huffman codes can be up to 15 bits long we need at least 15 bits - // ready in the bit buffer to start decoding the next huffman code. - if l.num_bits < 15 { - // First, make sure there is enough data in the bit buffer to decode a huffman code. - if in_iter.len() < 2 { - // If there is less than 2 bytes left in the input buffer, we try to look up - // the huffman code with what's available, and return if that doesn't succeed. - // Original explanation in miniz: - // /* TINFL_HUFF_BITBUF_FILL() is only used rarely, when the number of bytes - // * remaining in the input buffer falls below 2. */ - // /* It reads just enough bytes from the input stream that are needed to decode - // * the next Huffman code (and absolutely no more). It works by trying to fully - // * decode a */ - // /* Huffman code by using whatever bits are currently present in the bit buffer. - // * If this fails, it reads another byte, and tries again until it succeeds or - // * until the */ - // /* bit buffer contains >=15 bits (deflate's max. Huffman code size). */ - loop { - let mut temp = i32::from(r.tables[table].fast_lookup(l.bit_buf)); - - if temp >= 0 { - let code_len = (temp >> 9) as u32; - if (code_len != 0) && (l.num_bits >= code_len) { - break; - } - } else if l.num_bits > FAST_LOOKUP_BITS.into() { - let mut code_len = u32::from(FAST_LOOKUP_BITS); - loop { - temp = i32::from( - r.tables[table].tree - [(!temp + ((l.bit_buf >> code_len) & 1) as i32) as usize], - ); - code_len += 1; - if temp >= 0 || l.num_bits < code_len + 1 { - break; - } - } - if temp >= 0 { - break; - } - } - - // TODO: miniz jumps straight to here after getting here again after failing to read - // a byte. - // Doing that lets miniz avoid re-doing the lookup that that was done in the - // previous call. - let mut byte = 0; - if let a @ Action::End(_) = read_byte(in_iter, flags, |b| { - byte = b; - Action::None - }) { - return a; - }; - - // Do this outside closure for now to avoid borrowing r. - l.bit_buf |= BitBuffer::from(byte) << l.num_bits; - l.num_bits += 8; - - if l.num_bits >= 15 { - break; - } - } - } else { - // There is enough data in the input buffer, so read the next two bytes - // and add them to the bit buffer. - // Unwrapping here is fine since we just checked that there are at least two - // bytes left. - l.bit_buf |= BitBuffer::from(read_u16_le(in_iter)) << l.num_bits; - l.num_bits += 16; - } - } - - // We now have at least 15 bits in the input buffer. - let mut symbol = i32::from(r.tables[table].fast_lookup(l.bit_buf)); - let code_len; - // If the symbol was found in the fast lookup table. - if symbol >= 0 { - // Get the length value from the top bits. - // As we shift down the sign bit, converting to an unsigned value - // shouldn't overflow. - code_len = (symbol >> 9) as u32; - // Mask out the length value. - symbol &= 511; - } else { - let res = r.tables[table].tree_lookup(symbol, l.bit_buf, u32::from(FAST_LOOKUP_BITS)); - symbol = res.0; - code_len = res.1 as u32; - }; - - if code_len == 0 { - return Action::Jump(InvalidCodeLen); - } - - l.bit_buf >>= code_len as u32; - l.num_bits -= code_len; - f(r, l, symbol) -} - -/// Try to read one byte from `in_iter` and call `f` with the read byte as an argument, -/// returning the result. -/// If reading fails, `Action::End is returned` -#[inline] -fn read_byte<F>(in_iter: &mut slice::Iter<u8>, flags: u32, f: F) -> Action -where - F: FnOnce(u8) -> Action, -{ - match in_iter.next() { - None => end_of_input(flags), - Some(&byte) => f(byte), - } -} - -// TODO: `l: &mut LocalVars` may be slow similar to decompress_fast (even with inline(always)) -/// Try to read `amount` number of bits from `in_iter` and call the function `f` with the bits as an -/// an argument after reading, returning the result of that function, or `Action::End` if there are -/// not enough bytes left. -#[inline] -#[allow(clippy::while_immutable_condition)] -fn read_bits<F>( - l: &mut LocalVars, - amount: u32, - in_iter: &mut slice::Iter<u8>, - flags: u32, - f: F, -) -> Action -where - F: FnOnce(&mut LocalVars, BitBuffer) -> Action, -{ - // Clippy gives a false positive warning here due to the closure. - // Read enough bytes from the input iterator to cover the number of bits we want. - while l.num_bits < amount { - match read_byte(in_iter, flags, |byte| { - l.bit_buf |= BitBuffer::from(byte) << l.num_bits; - l.num_bits += 8; - Action::None - }) { - Action::None => (), - // If there are not enough bytes in the input iterator, return and signal that we need - // more. - action => return action, - } - } - - let bits = l.bit_buf & ((1 << amount) - 1); - l.bit_buf >>= amount; - l.num_bits -= amount; - f(l, bits) -} - -#[inline] -fn pad_to_bytes<F>(l: &mut LocalVars, in_iter: &mut slice::Iter<u8>, flags: u32, f: F) -> Action -where - F: FnOnce(&mut LocalVars) -> Action, -{ - let num_bits = l.num_bits & 7; - read_bits(l, num_bits, in_iter, flags, |l, _| f(l)) -} - -#[inline] -fn end_of_input(flags: u32) -> Action { - Action::End(if flags & TINFL_FLAG_HAS_MORE_INPUT != 0 { - TINFLStatus::NeedsMoreInput - } else { - TINFLStatus::FailedCannotMakeProgress - }) -} - -#[inline] -fn undo_bytes(l: &mut LocalVars, max: u32) -> u32 { - let res = cmp::min(l.num_bits >> 3, max); - l.num_bits -= res << 3; - res -} - -fn start_static_table(r: &mut DecompressorOxide) { - r.table_sizes[LITLEN_TABLE] = 288; - r.table_sizes[DIST_TABLE] = 32; - memset(&mut r.tables[LITLEN_TABLE].code_size[0..144], 8); - memset(&mut r.tables[LITLEN_TABLE].code_size[144..256], 9); - memset(&mut r.tables[LITLEN_TABLE].code_size[256..280], 7); - memset(&mut r.tables[LITLEN_TABLE].code_size[280..288], 8); - memset(&mut r.tables[DIST_TABLE].code_size[0..32], 5); -} - -static REVERSED_BITS_LOOKUP: [u32; 1024] = { - let mut table = [0; 1024]; - - let mut i = 0; - while i < 1024 { - table[i] = (i as u32).reverse_bits(); - i += 1; - } - - table -}; - -fn init_tree(r: &mut DecompressorOxide, l: &mut LocalVars) -> Action { - loop { - let table = &mut r.tables[r.block_type as usize]; - let table_size = r.table_sizes[r.block_type as usize] as usize; - let mut total_symbols = [0u32; 16]; - let mut next_code = [0u32; 17]; - memset(&mut table.look_up[..], 0); - memset(&mut table.tree[..], 0); - - for &code_size in &table.code_size[..table_size] { - total_symbols[code_size as usize] += 1; - } - - let mut used_symbols = 0; - let mut total = 0; - for i in 1..16 { - used_symbols += total_symbols[i]; - total += total_symbols[i]; - total <<= 1; - next_code[i + 1] = total; - } - - if total != 65_536 && used_symbols > 1 { - return Action::Jump(BadTotalSymbols); - } - - let mut tree_next = -1; - for symbol_index in 0..table_size { - let mut rev_code = 0; - let code_size = table.code_size[symbol_index]; - if code_size == 0 { - continue; - } - - let mut cur_code = next_code[code_size as usize]; - next_code[code_size as usize] += 1; - - let n = cur_code & (u32::MAX >> (32 - code_size)); - - let mut rev_code = if n < 1024 { - REVERSED_BITS_LOOKUP[n as usize] >> (32 - code_size) - } else { - for _ in 0..code_size { - rev_code = (rev_code << 1) | (cur_code & 1); - cur_code >>= 1; - } - rev_code - }; - - if code_size <= FAST_LOOKUP_BITS { - let k = (i16::from(code_size) << 9) | symbol_index as i16; - while rev_code < FAST_LOOKUP_SIZE { - table.look_up[rev_code as usize] = k; - rev_code += 1 << code_size; - } - continue; - } - - let mut tree_cur = table.look_up[(rev_code & (FAST_LOOKUP_SIZE - 1)) as usize]; - if tree_cur == 0 { - table.look_up[(rev_code & (FAST_LOOKUP_SIZE - 1)) as usize] = tree_next as i16; - tree_cur = tree_next; - tree_next -= 2; - } - - rev_code >>= FAST_LOOKUP_BITS - 1; - for _ in FAST_LOOKUP_BITS + 1..code_size { - rev_code >>= 1; - tree_cur -= (rev_code & 1) as i16; - if table.tree[(-tree_cur - 1) as usize] == 0 { - table.tree[(-tree_cur - 1) as usize] = tree_next as i16; - tree_cur = tree_next; - tree_next -= 2; - } else { - tree_cur = table.tree[(-tree_cur - 1) as usize]; - } - } - - rev_code >>= 1; - tree_cur -= (rev_code & 1) as i16; - table.tree[(-tree_cur - 1) as usize] = symbol_index as i16; - } - - if r.block_type == 2 { - l.counter = 0; - return Action::Jump(ReadLitlenDistTablesCodeSize); - } - - if r.block_type == 0 { - break; - } - r.block_type -= 1; - } - - l.counter = 0; - Action::Jump(DecodeLitlen) -} - -// A helper macro for generating the state machine. -// -// As Rust doesn't have fallthrough on matches, we have to return to the match statement -// and jump for each state change. (Which would ideally be optimized away, but often isn't.) -macro_rules! generate_state { - ($state: ident, $state_machine: tt, $f: expr) => { - loop { - match $f { - Action::None => continue, - Action::Jump(new_state) => { - $state = new_state; - continue $state_machine; - }, - Action::End(result) => break $state_machine result, - } - } - }; -} - -#[derive(Copy, Clone)] -struct LocalVars { - pub bit_buf: BitBuffer, - pub num_bits: u32, - pub dist: u32, - pub counter: u32, - pub num_extra: u32, -} - -#[inline] -fn transfer( - out_slice: &mut [u8], - mut source_pos: usize, - mut out_pos: usize, - match_len: usize, - out_buf_size_mask: usize, -) { - // special case that comes up surprisingly often. in the case that `source_pos` - // is 1 less than `out_pos`, we can say that the entire range will be the same - // value and optimize this to be a simple `memset` - let source_diff = if source_pos > out_pos { - source_pos - out_pos - } else { - out_pos - source_pos - }; - if out_buf_size_mask == usize::MAX && source_diff == 1 && out_pos > source_pos { - let init = out_slice[out_pos - 1]; - let end = (match_len >> 2) * 4 + out_pos; - - out_slice[out_pos..end].fill(init); - out_pos = end; - source_pos = end - 1; - // if the difference between `source_pos` and `out_pos` is greater than 3, we - // can do slightly better than the naive case by copying everything at once - } else if out_buf_size_mask == usize::MAX && source_diff >= 4 && out_pos > source_pos { - for _ in 0..match_len >> 2 { - out_slice.copy_within(source_pos..=source_pos + 3, out_pos); - source_pos += 4; - out_pos += 4; - } - } else { - for _ in 0..match_len >> 2 { - out_slice[out_pos] = out_slice[source_pos & out_buf_size_mask]; - out_slice[out_pos + 1] = out_slice[(source_pos + 1) & out_buf_size_mask]; - out_slice[out_pos + 2] = out_slice[(source_pos + 2) & out_buf_size_mask]; - out_slice[out_pos + 3] = out_slice[(source_pos + 3) & out_buf_size_mask]; - source_pos += 4; - out_pos += 4; - } - } - - match match_len & 3 { - 0 => (), - 1 => out_slice[out_pos] = out_slice[source_pos & out_buf_size_mask], - 2 => { - out_slice[out_pos] = out_slice[source_pos & out_buf_size_mask]; - out_slice[out_pos + 1] = out_slice[(source_pos + 1) & out_buf_size_mask]; - } - 3 => { - out_slice[out_pos] = out_slice[source_pos & out_buf_size_mask]; - out_slice[out_pos + 1] = out_slice[(source_pos + 1) & out_buf_size_mask]; - out_slice[out_pos + 2] = out_slice[(source_pos + 2) & out_buf_size_mask]; - } - _ => unreachable!(), - } -} - -/// Presumes that there is at least match_len bytes in output left. -#[inline] -fn apply_match( - out_slice: &mut [u8], - out_pos: usize, - dist: usize, - match_len: usize, - out_buf_size_mask: usize, -) { - debug_assert!(out_pos + match_len <= out_slice.len()); - - let source_pos = out_pos.wrapping_sub(dist) & out_buf_size_mask; - - if match_len == 3 { - // Fast path for match len 3. - out_slice[out_pos] = out_slice[source_pos]; - out_slice[out_pos + 1] = out_slice[(source_pos + 1) & out_buf_size_mask]; - out_slice[out_pos + 2] = out_slice[(source_pos + 2) & out_buf_size_mask]; - return; - } - - if cfg!(not(any(target_arch = "x86", target_arch = "x86_64"))) { - // We are not on x86 so copy manually. - transfer(out_slice, source_pos, out_pos, match_len, out_buf_size_mask); - return; - } - - if source_pos >= out_pos && (source_pos - out_pos) < match_len { - transfer(out_slice, source_pos, out_pos, match_len, out_buf_size_mask); - } else if match_len <= dist && source_pos + match_len < out_slice.len() { - // Destination and source segments does not intersect and source does not wrap. - if source_pos < out_pos { - let (from_slice, to_slice) = out_slice.split_at_mut(out_pos); - to_slice[..match_len].copy_from_slice(&from_slice[source_pos..source_pos + match_len]); - } else { - let (to_slice, from_slice) = out_slice.split_at_mut(source_pos); - to_slice[out_pos..out_pos + match_len].copy_from_slice(&from_slice[..match_len]); - } - } else { - transfer(out_slice, source_pos, out_pos, match_len, out_buf_size_mask); - } -} - -/// Fast inner decompression loop which is run while there is at least -/// 259 bytes left in the output buffer, and at least 6 bytes left in the input buffer -/// (The maximum one match would need + 1). -/// -/// This was inspired by a similar optimization in zlib, which uses this info to do -/// faster unchecked copies of multiple bytes at a time. -/// Currently we don't do this here, but this function does avoid having to jump through the -/// big match loop on each state change(as rust does not have fallthrough or gotos at the moment), -/// and already improves decompression speed a fair bit. -fn decompress_fast( - r: &mut DecompressorOxide, - in_iter: &mut slice::Iter<u8>, - out_buf: &mut OutputBuffer, - flags: u32, - local_vars: &mut LocalVars, - out_buf_size_mask: usize, -) -> (TINFLStatus, State) { - // Make a local copy of the most used variables, to avoid having to update and read from values - // in a random memory location and to encourage more register use. - let mut l = *local_vars; - let mut state; - - let status: TINFLStatus = 'o: loop { - state = State::DecodeLitlen; - loop { - // This function assumes that there is at least 259 bytes left in the output buffer, - // and that there is at least 14 bytes left in the input buffer. 14 input bytes: - // 15 (prev lit) + 15 (length) + 5 (length extra) + 15 (dist) - // + 29 + 32 (left in bit buf, including last 13 dist extra) = 111 bits < 14 bytes - // We need the one extra byte as we may write one length and one full match - // before checking again. - if out_buf.bytes_left() < 259 || in_iter.len() < 14 { - state = State::DecodeLitlen; - break 'o TINFLStatus::Done; - } - - fill_bit_buffer(&mut l, in_iter); - - if let Some((symbol, code_len)) = r.tables[LITLEN_TABLE].lookup(l.bit_buf) { - l.counter = symbol as u32; - l.bit_buf >>= code_len; - l.num_bits -= code_len; - - if (l.counter & 256) != 0 { - // The symbol is not a literal. - break; - } else { - // If we have a 32-bit buffer we need to read another two bytes now - // to have enough bits to keep going. - if cfg!(not(target_pointer_width = "64")) { - fill_bit_buffer(&mut l, in_iter); - } - - if let Some((symbol, code_len)) = r.tables[LITLEN_TABLE].lookup(l.bit_buf) { - l.bit_buf >>= code_len; - l.num_bits -= code_len; - // The previous symbol was a literal, so write it directly and check - // the next one. - out_buf.write_byte(l.counter as u8); - if (symbol & 256) != 0 { - l.counter = symbol as u32; - // The symbol is a length value. - break; - } else { - // The symbol is a literal, so write it directly and continue. - out_buf.write_byte(symbol as u8); - } - } else { - state.begin(InvalidCodeLen); - break 'o TINFLStatus::Failed; - } - } - } else { - state.begin(InvalidCodeLen); - break 'o TINFLStatus::Failed; - } - } - - // Mask the top bits since they may contain length info. - l.counter &= 511; - if l.counter == 256 { - // We hit the end of block symbol. - state.begin(BlockDone); - break 'o TINFLStatus::Done; - } else if l.counter > 285 { - // Invalid code. - // We already verified earlier that the code is > 256. - state.begin(InvalidLitlen); - break 'o TINFLStatus::Failed; - } else { - // The symbol was a length code. - // # Optimization - // Mask the value to avoid bounds checks - // We could use get_unchecked later if can statically verify that - // this will never go out of bounds. - l.num_extra = u32::from(LENGTH_EXTRA[(l.counter - 257) as usize & BASE_EXTRA_MASK]); - l.counter = u32::from(LENGTH_BASE[(l.counter - 257) as usize & BASE_EXTRA_MASK]); - // Length and distance codes have a number of extra bits depending on - // the base, which together with the base gives us the exact value. - - fill_bit_buffer(&mut l, in_iter); - if l.num_extra != 0 { - let extra_bits = l.bit_buf & ((1 << l.num_extra) - 1); - l.bit_buf >>= l.num_extra; - l.num_bits -= l.num_extra; - l.counter += extra_bits as u32; - } - - // We found a length code, so a distance code should follow. - - if cfg!(not(target_pointer_width = "64")) { - fill_bit_buffer(&mut l, in_iter); - } - - if let Some((mut symbol, code_len)) = r.tables[DIST_TABLE].lookup(l.bit_buf) { - symbol &= 511; - l.bit_buf >>= code_len; - l.num_bits -= code_len; - if symbol > 29 { - state.begin(InvalidDist); - break 'o TINFLStatus::Failed; - } - - l.num_extra = u32::from(DIST_EXTRA[symbol as usize]); - l.dist = u32::from(DIST_BASE[symbol as usize]); - } else { - state.begin(InvalidCodeLen); - break 'o TINFLStatus::Failed; - } - - if l.num_extra != 0 { - fill_bit_buffer(&mut l, in_iter); - let extra_bits = l.bit_buf & ((1 << l.num_extra) - 1); - l.bit_buf >>= l.num_extra; - l.num_bits -= l.num_extra; - l.dist += extra_bits as u32; - } - - let position = out_buf.position(); - if l.dist as usize > out_buf.position() - && (flags & TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF != 0) - { - // We encountered a distance that refers a position before - // the start of the decoded data, so we can't continue. - state.begin(DistanceOutOfBounds); - break TINFLStatus::Failed; - } - - apply_match( - out_buf.get_mut(), - position, - l.dist as usize, - l.counter as usize, - out_buf_size_mask, - ); - - out_buf.set_position(position + l.counter as usize); - } - }; - - *local_vars = l; - (status, state) -} - -/// Main decompression function. Keeps decompressing data from `in_buf` until the `in_buf` is -/// empty, `out` is full, the end of the deflate stream is hit, or there is an error in the -/// deflate stream. -/// -/// # Arguments -/// -/// `r` is a [`DecompressorOxide`] struct with the state of this stream. -/// -/// `in_buf` is a reference to the compressed data that is to be decompressed. The decompressor will -/// start at the first byte of this buffer. -/// -/// `out` is a reference to the buffer that will store the decompressed data, and that -/// stores previously decompressed data if any. -/// -/// * The offset given by `out_pos` indicates where in the output buffer slice writing should start. -/// * If [`TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF`] is not set, the output buffer is used in a -/// wrapping manner, and it's size is required to be a power of 2. -/// * The decompression function normally needs access to 32KiB of the previously decompressed data -///(or to the beginning of the decompressed data if less than 32KiB has been decompressed.) -/// - If this data is not available, decompression may fail. -/// - Some deflate compressors allow specifying a window size which limits match distances to -/// less than this, or alternatively an RLE mode where matches will only refer to the previous byte -/// and thus allows a smaller output buffer. The window size can be specified in the zlib -/// header structure, however, the header data should not be relied on to be correct. -/// -/// `flags` indicates settings and status to the decompression function. -/// * The [`TINFL_FLAG_HAS_MORE_INPUT`] has to be specified if more compressed data is to be provided -/// in a subsequent call to this function. -/// * See the the [`inflate_flags`] module for details on other flags. -/// -/// # Returns -/// -/// Returns a tuple containing the status of the compressor, the number of input bytes read, and the -/// number of bytes output to `out`. -/// -/// This function shouldn't panic pending any bugs. -pub fn decompress( - r: &mut DecompressorOxide, - in_buf: &[u8], - out: &mut [u8], - out_pos: usize, - flags: u32, -) -> (TINFLStatus, usize, usize) { - let out_buf_size_mask = if flags & TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF != 0 { - usize::max_value() - } else { - // In the case of zero len, any attempt to write would produce HasMoreOutput, - // so to gracefully process the case of there really being no output, - // set the mask to all zeros. - out.len().saturating_sub(1) - }; - - // Ensure the output buffer's size is a power of 2, unless the output buffer - // is large enough to hold the entire output file (in which case it doesn't - // matter). - // Also make sure that the output buffer position is not past the end of the output buffer. - if (out_buf_size_mask.wrapping_add(1) & out_buf_size_mask) != 0 || out_pos > out.len() { - return (TINFLStatus::BadParam, 0, 0); - } - - let mut in_iter = in_buf.iter(); - - let mut state = r.state; - - let mut out_buf = OutputBuffer::from_slice_and_pos(out, out_pos); - - // Make a local copy of the important variables here so we can work with them on the stack. - let mut l = LocalVars { - bit_buf: r.bit_buf, - num_bits: r.num_bits, - dist: r.dist, - counter: r.counter, - num_extra: r.num_extra, - }; - - let mut status = 'state_machine: loop { - match state { - Start => generate_state!(state, 'state_machine, { - l.bit_buf = 0; - l.num_bits = 0; - l.dist = 0; - l.counter = 0; - l.num_extra = 0; - r.z_header0 = 0; - r.z_header1 = 0; - r.z_adler32 = 1; - r.check_adler32 = 1; - if flags & TINFL_FLAG_PARSE_ZLIB_HEADER != 0 { - Action::Jump(State::ReadZlibCmf) - } else { - Action::Jump(State::ReadBlockHeader) - } - }), - - ReadZlibCmf => generate_state!(state, 'state_machine, { - read_byte(&mut in_iter, flags, |cmf| { - r.z_header0 = u32::from(cmf); - Action::Jump(State::ReadZlibFlg) - }) - }), - - ReadZlibFlg => generate_state!(state, 'state_machine, { - read_byte(&mut in_iter, flags, |flg| { - r.z_header1 = u32::from(flg); - validate_zlib_header(r.z_header0, r.z_header1, flags, out_buf_size_mask) - }) - }), - - // Read the block header and jump to the relevant section depending on the block type. - ReadBlockHeader => generate_state!(state, 'state_machine, { - read_bits(&mut l, 3, &mut in_iter, flags, |l, bits| { - r.finish = (bits & 1) as u32; - r.block_type = (bits >> 1) as u32 & 3; - match r.block_type { - 0 => Action::Jump(BlockTypeNoCompression), - 1 => { - start_static_table(r); - init_tree(r, l) - }, - 2 => { - l.counter = 0; - Action::Jump(ReadTableSizes) - }, - 3 => Action::Jump(BlockTypeUnexpected), - _ => unreachable!() - } - }) - }), - - // Raw/Stored/uncompressed block. - BlockTypeNoCompression => generate_state!(state, 'state_machine, { - pad_to_bytes(&mut l, &mut in_iter, flags, |l| { - l.counter = 0; - Action::Jump(RawHeader) - }) - }), - - // Check that the raw block header is correct. - RawHeader => generate_state!(state, 'state_machine, { - if l.counter < 4 { - // Read block length and block length check. - if l.num_bits != 0 { - read_bits(&mut l, 8, &mut in_iter, flags, |l, bits| { - r.raw_header[l.counter as usize] = bits as u8; - l.counter += 1; - Action::None - }) - } else { - read_byte(&mut in_iter, flags, |byte| { - r.raw_header[l.counter as usize] = byte; - l.counter += 1; - Action::None - }) - } - } else { - // Check if the length value of a raw block is correct. - // The 2 first (2-byte) words in a raw header are the length and the - // ones complement of the length. - let length = u16::from(r.raw_header[0]) | (u16::from(r.raw_header[1]) << 8); - let check = u16::from(r.raw_header[2]) | (u16::from(r.raw_header[3]) << 8); - let valid = length == !check; - l.counter = length.into(); - - if !valid { - Action::Jump(BadRawLength) - } else if l.counter == 0 { - // Empty raw block. Sometimes used for synchronization. - Action::Jump(BlockDone) - } else if l.num_bits != 0 { - // There is some data in the bit buffer, so we need to write that first. - Action::Jump(RawReadFirstByte) - } else { - // The bit buffer is empty, so memcpy the rest of the uncompressed data from - // the block. - Action::Jump(RawMemcpy1) - } - } - }), - - // Read the byte from the bit buffer. - RawReadFirstByte => generate_state!(state, 'state_machine, { - read_bits(&mut l, 8, &mut in_iter, flags, |l, bits| { - l.dist = bits as u32; - Action::Jump(RawStoreFirstByte) - }) - }), - - // Write the byte we just read to the output buffer. - RawStoreFirstByte => generate_state!(state, 'state_machine, { - if out_buf.bytes_left() == 0 { - Action::End(TINFLStatus::HasMoreOutput) - } else { - out_buf.write_byte(l.dist as u8); - l.counter -= 1; - if l.counter == 0 || l.num_bits == 0 { - Action::Jump(RawMemcpy1) - } else { - // There is still some data left in the bit buffer that needs to be output. - // TODO: Changed this to jump to `RawReadfirstbyte` rather than - // `RawStoreFirstByte` as that seemed to be the correct path, but this - // needs testing. - Action::Jump(RawReadFirstByte) - } - } - }), - - RawMemcpy1 => generate_state!(state, 'state_machine, { - if l.counter == 0 { - Action::Jump(BlockDone) - } else if out_buf.bytes_left() == 0 { - Action::End(TINFLStatus::HasMoreOutput) - } else { - Action::Jump(RawMemcpy2) - } - }), - - RawMemcpy2 => generate_state!(state, 'state_machine, { - if in_iter.len() > 0 { - // Copy as many raw bytes as possible from the input to the output using memcpy. - // Raw block lengths are limited to 64 * 1024, so casting through usize and u32 - // is not an issue. - let space_left = out_buf.bytes_left(); - let bytes_to_copy = cmp::min(cmp::min( - space_left, - in_iter.len()), - l.counter as usize - ); - - out_buf.write_slice(&in_iter.as_slice()[..bytes_to_copy]); - - (&mut in_iter).nth(bytes_to_copy - 1); - l.counter -= bytes_to_copy as u32; - Action::Jump(RawMemcpy1) - } else { - end_of_input(flags) - } - }), - - // Read how many huffman codes/symbols are used for each table. - ReadTableSizes => generate_state!(state, 'state_machine, { - if l.counter < 3 { - let num_bits = [5, 5, 4][l.counter as usize]; - read_bits(&mut l, num_bits, &mut in_iter, flags, |l, bits| { - r.table_sizes[l.counter as usize] = - bits as u32 + u32::from(MIN_TABLE_SIZES[l.counter as usize]); - l.counter += 1; - Action::None - }) - } else { - memset(&mut r.tables[HUFFLEN_TABLE].code_size[..], 0); - l.counter = 0; - // Check that the litlen and distance are within spec. - // litlen table should be <=286 acc to the RFC and - // additionally zlib rejects dist table sizes larger than 30. - // NOTE this the final sizes after adding back predefined values, not - // raw value in the data. - // See miniz_oxide issue #130 and https://github.com/madler/zlib/issues/82. - if r.table_sizes[LITLEN_TABLE] <= 286 && r.table_sizes[DIST_TABLE] <= 30 { - Action::Jump(ReadHufflenTableCodeSize) - } - else { - Action::Jump(BadDistOrLiteralTableLength) - } - } - }), - - // Read the 3-bit lengths of the huffman codes describing the huffman code lengths used - // to decode the lengths of the main tables. - ReadHufflenTableCodeSize => generate_state!(state, 'state_machine, { - if l.counter < r.table_sizes[HUFFLEN_TABLE] { - read_bits(&mut l, 3, &mut in_iter, flags, |l, bits| { - // These lengths are not stored in a normal ascending order, but rather one - // specified by the deflate specification intended to put the most used - // values at the front as trailing zero lengths do not have to be stored. - r.tables[HUFFLEN_TABLE] - .code_size[HUFFMAN_LENGTH_ORDER[l.counter as usize] as usize] = - bits as u8; - l.counter += 1; - Action::None - }) - } else { - r.table_sizes[HUFFLEN_TABLE] = 19; - init_tree(r, &mut l) - } - }), - - ReadLitlenDistTablesCodeSize => generate_state!(state, 'state_machine, { - if l.counter < r.table_sizes[LITLEN_TABLE] + r.table_sizes[DIST_TABLE] { - decode_huffman_code( - r, &mut l, HUFFLEN_TABLE, - flags, &mut in_iter, |r, l, symbol| { - l.dist = symbol as u32; - if l.dist < 16 { - r.len_codes[l.counter as usize] = l.dist as u8; - l.counter += 1; - Action::None - } else if l.dist == 16 && l.counter == 0 { - Action::Jump(BadCodeSizeDistPrevLookup) - } else { - l.num_extra = [2, 3, 7][l.dist as usize - 16]; - Action::Jump(ReadExtraBitsCodeSize) - } - } - ) - } else if l.counter != r.table_sizes[LITLEN_TABLE] + r.table_sizes[DIST_TABLE] { - Action::Jump(BadCodeSizeSum) - } else { - r.tables[LITLEN_TABLE].code_size[..r.table_sizes[LITLEN_TABLE] as usize] - .copy_from_slice(&r.len_codes[..r.table_sizes[LITLEN_TABLE] as usize]); - - let dist_table_start = r.table_sizes[LITLEN_TABLE] as usize; - let dist_table_end = (r.table_sizes[LITLEN_TABLE] + - r.table_sizes[DIST_TABLE]) as usize; - r.tables[DIST_TABLE].code_size[..r.table_sizes[DIST_TABLE] as usize] - .copy_from_slice(&r.len_codes[dist_table_start..dist_table_end]); - - r.block_type -= 1; - init_tree(r, &mut l) - } - }), - - ReadExtraBitsCodeSize => generate_state!(state, 'state_machine, { - let num_extra = l.num_extra; - read_bits(&mut l, num_extra, &mut in_iter, flags, |l, mut extra_bits| { - // Mask to avoid a bounds check. - extra_bits += [3, 3, 11][(l.dist as usize - 16) & 3]; - let val = if l.dist == 16 { - r.len_codes[l.counter as usize - 1] - } else { - 0 - }; - - memset( - &mut r.len_codes[ - l.counter as usize..l.counter as usize + extra_bits as usize - ], - val, - ); - l.counter += extra_bits as u32; - Action::Jump(ReadLitlenDistTablesCodeSize) - }) - }), - - DecodeLitlen => generate_state!(state, 'state_machine, { - if in_iter.len() < 4 || out_buf.bytes_left() < 2 { - // See if we can decode a literal with the data we have left. - // Jumps to next state (WriteSymbol) if successful. - decode_huffman_code( - r, - &mut l, - LITLEN_TABLE, - flags, - &mut in_iter, - |_r, l, symbol| { - l.counter = symbol as u32; - Action::Jump(WriteSymbol) - }, - ) - } else if - // If there is enough space, use the fast inner decompression - // function. - out_buf.bytes_left() >= 259 && - in_iter.len() >= 14 - { - let (status, new_state) = decompress_fast( - r, - &mut in_iter, - &mut out_buf, - flags, - &mut l, - out_buf_size_mask, - ); - - state = new_state; - if status == TINFLStatus::Done { - Action::Jump(new_state) - } else { - Action::End(status) - } - } else { - fill_bit_buffer(&mut l, &mut in_iter); - - if let Some((symbol, code_len)) = r.tables[LITLEN_TABLE].lookup(l.bit_buf) { - - l.counter = symbol as u32; - l.bit_buf >>= code_len; - l.num_bits -= code_len; - - if (l.counter & 256) != 0 { - // The symbol is not a literal. - Action::Jump(HuffDecodeOuterLoop1) - } else { - // If we have a 32-bit buffer we need to read another two bytes now - // to have enough bits to keep going. - if cfg!(not(target_pointer_width = "64")) { - fill_bit_buffer(&mut l, &mut in_iter); - } - - if let Some((symbol, code_len)) = r.tables[LITLEN_TABLE].lookup(l.bit_buf) { - - l.bit_buf >>= code_len; - l.num_bits -= code_len; - // The previous symbol was a literal, so write it directly and check - // the next one. - out_buf.write_byte(l.counter as u8); - if (symbol & 256) != 0 { - l.counter = symbol as u32; - // The symbol is a length value. - Action::Jump(HuffDecodeOuterLoop1) - } else { - // The symbol is a literal, so write it directly and continue. - out_buf.write_byte(symbol as u8); - Action::None - } - } else { - Action::Jump(InvalidCodeLen) - } - } - } else { - Action::Jump(InvalidCodeLen) - } - } - }), - - WriteSymbol => generate_state!(state, 'state_machine, { - if l.counter >= 256 { - Action::Jump(HuffDecodeOuterLoop1) - } else if out_buf.bytes_left() > 0 { - out_buf.write_byte(l.counter as u8); - Action::Jump(DecodeLitlen) - } else { - Action::End(TINFLStatus::HasMoreOutput) - } - }), - - HuffDecodeOuterLoop1 => generate_state!(state, 'state_machine, { - // Mask the top bits since they may contain length info. - l.counter &= 511; - - if l.counter - == 256 { - // We hit the end of block symbol. - Action::Jump(BlockDone) - } else if l.counter > 285 { - // Invalid code. - // We already verified earlier that the code is > 256. - Action::Jump(InvalidLitlen) - } else { - // # Optimization - // Mask the value to avoid bounds checks - // We could use get_unchecked later if can statically verify that - // this will never go out of bounds. - l.num_extra = - u32::from(LENGTH_EXTRA[(l.counter - 257) as usize & BASE_EXTRA_MASK]); - l.counter = u32::from(LENGTH_BASE[(l.counter - 257) as usize & BASE_EXTRA_MASK]); - // Length and distance codes have a number of extra bits depending on - // the base, which together with the base gives us the exact value. - if l.num_extra != 0 { - Action::Jump(ReadExtraBitsLitlen) - } else { - Action::Jump(DecodeDistance) - } - } - }), - - ReadExtraBitsLitlen => generate_state!(state, 'state_machine, { - let num_extra = l.num_extra; - read_bits(&mut l, num_extra, &mut in_iter, flags, |l, extra_bits| { - l.counter += extra_bits as u32; - Action::Jump(DecodeDistance) - }) - }), - - DecodeDistance => generate_state!(state, 'state_machine, { - // Try to read a huffman code from the input buffer and look up what - // length code the decoded symbol refers to. - decode_huffman_code(r, &mut l, DIST_TABLE, flags, &mut in_iter, |_r, l, symbol| { - if symbol > 29 { - // Invalid distance code. - return Action::Jump(InvalidDist) - } - // # Optimization - // Mask the value to avoid bounds checks - // We could use get_unchecked later if can statically verify that - // this will never go out of bounds. - l.num_extra = u32::from(DIST_EXTRA[symbol as usize & BASE_EXTRA_MASK]); - l.dist = u32::from(DIST_BASE[symbol as usize & BASE_EXTRA_MASK]); - if l.num_extra != 0 { - // ReadEXTRA_BITS_DISTACNE - Action::Jump(ReadExtraBitsDistance) - } else { - Action::Jump(HuffDecodeOuterLoop2) - } - }) - }), - - ReadExtraBitsDistance => generate_state!(state, 'state_machine, { - let num_extra = l.num_extra; - read_bits(&mut l, num_extra, &mut in_iter, flags, |l, extra_bits| { - l.dist += extra_bits as u32; - Action::Jump(HuffDecodeOuterLoop2) - }) - }), - - HuffDecodeOuterLoop2 => generate_state!(state, 'state_machine, { - if l.dist as usize > out_buf.position() && - (flags & TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF != 0) - { - // We encountered a distance that refers a position before - // the start of the decoded data, so we can't continue. - Action::Jump(DistanceOutOfBounds) - } else { - let out_pos = out_buf.position(); - let source_pos = out_buf.position() - .wrapping_sub(l.dist as usize) & out_buf_size_mask; - - let out_len = out_buf.get_ref().len() as usize; - let match_end_pos = out_buf.position() + l.counter as usize; - - if match_end_pos > out_len || - // miniz doesn't do this check here. Not sure how it makes sure - // that this case doesn't happen. - (source_pos >= out_pos && (source_pos - out_pos) < l.counter as usize) - { - // Not enough space for all of the data in the output buffer, - // so copy what we have space for. - if l.counter == 0 { - Action::Jump(DecodeLitlen) - } else { - Action::Jump(WriteLenBytesToEnd) - } - } else { - apply_match( - out_buf.get_mut(), - out_pos, - l.dist as usize, - l.counter as usize, - out_buf_size_mask - ); - out_buf.set_position(out_pos + l.counter as usize); - Action::Jump(DecodeLitlen) - } - } - }), - - WriteLenBytesToEnd => generate_state!(state, 'state_machine, { - if out_buf.bytes_left() > 0 { - let out_pos = out_buf.position(); - let source_pos = out_buf.position() - .wrapping_sub(l.dist as usize) & out_buf_size_mask; - - - let len = cmp::min(out_buf.bytes_left(), l.counter as usize); - - transfer(out_buf.get_mut(), source_pos, out_pos, len, out_buf_size_mask); - - out_buf.set_position(out_pos + len); - l.counter -= len as u32; - if l.counter == 0 { - Action::Jump(DecodeLitlen) - } else { - Action::None - } - } else { - Action::End(TINFLStatus::HasMoreOutput) - } - }), - - BlockDone => generate_state!(state, 'state_machine, { - // End once we've read the last block. - if r.finish != 0 { - pad_to_bytes(&mut l, &mut in_iter, flags, |_| Action::None); - - let in_consumed = in_buf.len() - in_iter.len(); - let undo = undo_bytes(&mut l, in_consumed as u32) as usize; - in_iter = in_buf[in_consumed - undo..].iter(); - - l.bit_buf &= ((1 as BitBuffer) << l.num_bits) - 1; - debug_assert_eq!(l.num_bits, 0); - - if flags & TINFL_FLAG_PARSE_ZLIB_HEADER != 0 { - l.counter = 0; - Action::Jump(ReadAdler32) - } else { - Action::Jump(DoneForever) - } - } else { - Action::Jump(ReadBlockHeader) - } - }), - - ReadAdler32 => generate_state!(state, 'state_machine, { - if l.counter < 4 { - if l.num_bits != 0 { - read_bits(&mut l, 8, &mut in_iter, flags, |l, bits| { - r.z_adler32 <<= 8; - r.z_adler32 |= bits as u32; - l.counter += 1; - Action::None - }) - } else { - read_byte(&mut in_iter, flags, |byte| { - r.z_adler32 <<= 8; - r.z_adler32 |= u32::from(byte); - l.counter += 1; - Action::None - }) - } - } else { - Action::Jump(DoneForever) - } - }), - - // We are done. - DoneForever => break TINFLStatus::Done, - - // Anything else indicates failure. - // BadZlibHeader | BadRawLength | BadDistOrLiteralTableLength | BlockTypeUnexpected | - // DistanceOutOfBounds | - // BadTotalSymbols | BadCodeSizeDistPrevLookup | BadCodeSizeSum | InvalidLitlen | - // InvalidDist | InvalidCodeLen - _ => break TINFLStatus::Failed, - }; - }; - - let in_undo = if status != TINFLStatus::NeedsMoreInput - && status != TINFLStatus::FailedCannotMakeProgress - { - undo_bytes(&mut l, (in_buf.len() - in_iter.len()) as u32) as usize - } else { - 0 - }; - - // Make sure HasMoreOutput overrides NeedsMoreInput if the output buffer is full. - // (Unless the missing input is the adler32 value in which case we don't need to write anything.) - // TODO: May want to see if we can do this in a better way. - if status == TINFLStatus::NeedsMoreInput - && out_buf.bytes_left() == 0 - && state != State::ReadAdler32 - { - status = TINFLStatus::HasMoreOutput - } - - r.state = state; - r.bit_buf = l.bit_buf; - r.num_bits = l.num_bits; - r.dist = l.dist; - r.counter = l.counter; - r.num_extra = l.num_extra; - - r.bit_buf &= ((1 as BitBuffer) << r.num_bits) - 1; - - // If this is a zlib stream, and update the adler32 checksum with the decompressed bytes if - // requested. - let need_adler = if (flags & TINFL_FLAG_IGNORE_ADLER32) == 0 { - flags & (TINFL_FLAG_PARSE_ZLIB_HEADER | TINFL_FLAG_COMPUTE_ADLER32) != 0 - } else { - // If TINFL_FLAG_IGNORE_ADLER32 is enabled, ignore the checksum. - false - }; - if need_adler && status as i32 >= 0 { - let out_buf_pos = out_buf.position(); - r.check_adler32 = update_adler32(r.check_adler32, &out_buf.get_ref()[out_pos..out_buf_pos]); - - // disabled so that random input from fuzzer would not be rejected early, - // before it has a chance to reach interesting parts of code - if !cfg!(fuzzing) { - // Once we are done, check if the checksum matches with the one provided in the zlib header. - if status == TINFLStatus::Done - && flags & TINFL_FLAG_PARSE_ZLIB_HEADER != 0 - && r.check_adler32 != r.z_adler32 - { - status = TINFLStatus::Adler32Mismatch; - } - } - } - - ( - status, - in_buf.len() - in_iter.len() - in_undo, - out_buf.position() - out_pos, - ) -} - -#[cfg(test)] -mod test { - use super::*; - - //TODO: Fix these. - - fn tinfl_decompress_oxide<'i>( - r: &mut DecompressorOxide, - input_buffer: &'i [u8], - output_buffer: &mut [u8], - flags: u32, - ) -> (TINFLStatus, &'i [u8], usize) { - let (status, in_pos, out_pos) = decompress(r, input_buffer, output_buffer, 0, flags); - (status, &input_buffer[in_pos..], out_pos) - } - - #[test] - fn decompress_zlib() { - let encoded = [ - 120, 156, 243, 72, 205, 201, 201, 215, 81, 168, 202, 201, 76, 82, 4, 0, 27, 101, 4, 19, - ]; - let flags = TINFL_FLAG_COMPUTE_ADLER32 | TINFL_FLAG_PARSE_ZLIB_HEADER; - - let mut b = DecompressorOxide::new(); - const LEN: usize = 32; - let mut b_buf = vec![0; LEN]; - - // This should fail with the out buffer being to small. - let b_status = tinfl_decompress_oxide(&mut b, &encoded[..], b_buf.as_mut_slice(), flags); - - assert_eq!(b_status.0, TINFLStatus::Failed); - - let flags = flags | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF; - - b = DecompressorOxide::new(); - - // With TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF set this should no longer fail. - let b_status = tinfl_decompress_oxide(&mut b, &encoded[..], b_buf.as_mut_slice(), flags); - - assert_eq!(b_buf[..b_status.2], b"Hello, zlib!"[..]); - assert_eq!(b_status.0, TINFLStatus::Done); - } - - #[test] - fn raw_block() { - const LEN: usize = 64; - - 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 flags = TINFL_FLAG_COMPUTE_ADLER32 | TINFL_FLAG_PARSE_ZLIB_HEADER | - let flags = TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF; - - let mut b = DecompressorOxide::new(); - - let mut b_buf = vec![0; LEN]; - - let b_status = tinfl_decompress_oxide(&mut b, &encoded[..], b_buf.as_mut_slice(), flags); - assert_eq!(b_buf[..b_status.2], text[..]); - assert_eq!(b_status.0, TINFLStatus::Done); - } - - fn masked_lookup(table: &HuffmanTable, bit_buf: BitBuffer) -> (i32, u32) { - let ret = table.lookup(bit_buf).unwrap(); - (ret.0 & 511, ret.1) - } - - #[test] - fn fixed_table_lookup() { - let mut d = DecompressorOxide::new(); - d.block_type = 1; - start_static_table(&mut d); - let mut l = LocalVars { - bit_buf: d.bit_buf, - num_bits: d.num_bits, - dist: d.dist, - counter: d.counter, - num_extra: d.num_extra, - }; - init_tree(&mut d, &mut l); - let llt = &d.tables[LITLEN_TABLE]; - let dt = &d.tables[DIST_TABLE]; - assert_eq!(masked_lookup(llt, 0b00001100), (0, 8)); - assert_eq!(masked_lookup(llt, 0b00011110), (72, 8)); - assert_eq!(masked_lookup(llt, 0b01011110), (74, 8)); - assert_eq!(masked_lookup(llt, 0b11111101), (143, 8)); - assert_eq!(masked_lookup(llt, 0b000010011), (144, 9)); - assert_eq!(masked_lookup(llt, 0b111111111), (255, 9)); - assert_eq!(masked_lookup(llt, 0b00000000), (256, 7)); - assert_eq!(masked_lookup(llt, 0b1110100), (279, 7)); - assert_eq!(masked_lookup(llt, 0b00000011), (280, 8)); - assert_eq!(masked_lookup(llt, 0b11100011), (287, 8)); - - assert_eq!(masked_lookup(dt, 0), (0, 5)); - assert_eq!(masked_lookup(dt, 20), (5, 5)); - } - - fn check_result(input: &[u8], expected_status: TINFLStatus, expected_state: State, zlib: bool) { - let mut r = DecompressorOxide::default(); - let mut output_buf = vec![0; 1024 * 32]; - let flags = if zlib { - inflate_flags::TINFL_FLAG_PARSE_ZLIB_HEADER - } else { - 0 - } | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF - | TINFL_FLAG_HAS_MORE_INPUT; - let (d_status, _in_bytes, _out_bytes) = - decompress(&mut r, input, &mut output_buf, 0, flags); - assert_eq!(expected_status, d_status); - assert_eq!(expected_state, r.state); - } - - #[test] - fn bogus_input() { - use self::check_result as cr; - const F: TINFLStatus = TINFLStatus::Failed; - const OK: TINFLStatus = TINFLStatus::Done; - // Bad CM. - cr(&[0x77, 0x85], F, State::BadZlibHeader, true); - // Bad window size (but check is correct). - cr(&[0x88, 0x98], F, State::BadZlibHeader, true); - // Bad check bits. - cr(&[0x78, 0x98], F, State::BadZlibHeader, true); - - // Too many code lengths. (From inflate library issues) - cr( - b"M\xff\xffM*\xad\xad\xad\xad\xad\xad\xad\xcd\xcd\xcdM", - F, - State::BadDistOrLiteralTableLength, - false, - ); - - // Bad CLEN (also from inflate library issues) - cr( - b"\xdd\xff\xff*M\x94ffffffffff", - F, - State::BadDistOrLiteralTableLength, - false, - ); - - // Port of inflate coverage tests from zlib-ng - // https://github.com/Dead2/zlib-ng/blob/develop/test/infcover.c - let c = |a, b, c| cr(a, b, c, false); - - // Invalid uncompressed/raw block length. - c(&[0, 0, 0, 0, 0], F, State::BadRawLength); - // Ok empty uncompressed block. - c(&[3, 0], OK, State::DoneForever); - // Invalid block type. - c(&[6], F, State::BlockTypeUnexpected); - // Ok uncompressed block. - c(&[1, 1, 0, 0xfe, 0xff, 0], OK, State::DoneForever); - // Too many litlens, we handle this later than zlib, so this test won't - // give the same result. - // c(&[0xfc, 0, 0], F, State::BadTotalSymbols); - // Invalid set of code lengths - TODO Check if this is the correct error for this. - c(&[4, 0, 0xfe, 0xff], F, State::BadTotalSymbols); - // Invalid repeat in list of code lengths. - // (Try to repeat a non-existent code.) - c(&[4, 0, 0x24, 0x49, 0], F, State::BadCodeSizeDistPrevLookup); - // Missing end of block code (should we have a separate error for this?) - fails on further input - // c(&[4, 0, 0x24, 0xe9, 0xff, 0x6d], F, State::BadTotalSymbols); - // Invalid set of literals/lengths - c( - &[ - 4, 0x80, 0x49, 0x92, 0x24, 0x49, 0x92, 0x24, 0x71, 0xff, 0xff, 0x93, 0x11, 0, - ], - F, - State::BadTotalSymbols, - ); - // Invalid set of distances _ needsmoreinput - // c(&[4, 0x80, 0x49, 0x92, 0x24, 0x49, 0x92, 0x24, 0x0f, 0xb4, 0xff, 0xff, 0xc3, 0x84], F, State::BadTotalSymbols); - // Invalid distance code - c(&[2, 0x7e, 0xff, 0xff], F, State::InvalidDist); - - // Distance refers to position before the start - c( - &[0x0c, 0xc0, 0x81, 0, 0, 0, 0, 0, 0x90, 0xff, 0x6b, 0x4, 0], - F, - State::DistanceOutOfBounds, - ); - - // Trailer - // Bad gzip trailer checksum GZip header not handled by miniz_oxide - //cr(&[0x1f, 0x8b, 0x08 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0x03, 0, 0, 0, 0, 0x01], F, State::BadCRC, false) - // Bad gzip trailer length - //cr(&[0x1f, 0x8b, 0x08 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0x03, 0, 0, 0, 0, 0, 0, 0, 0, 0x01], F, State::BadCRC, false) - } - - #[test] - fn empty_output_buffer_non_wrapping() { - let encoded = [ - 120, 156, 243, 72, 205, 201, 201, 215, 81, 168, 202, 201, 76, 82, 4, 0, 27, 101, 4, 19, - ]; - let flags = TINFL_FLAG_COMPUTE_ADLER32 - | TINFL_FLAG_PARSE_ZLIB_HEADER - | TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF; - let mut r = DecompressorOxide::new(); - let mut output_buf = vec![]; - // Check that we handle an empty buffer properly and not panicking. - // https://github.com/Frommi/miniz_oxide/issues/23 - let res = decompress(&mut r, &encoded, &mut output_buf, 0, flags); - assert_eq!(res, (TINFLStatus::HasMoreOutput, 4, 0)); - } - - #[test] - fn empty_output_buffer_wrapping() { - let encoded = [ - 0x73, 0x49, 0x4d, 0xcb, 0x49, 0x2c, 0x49, 0x55, 0x00, 0x11, 0x00, - ]; - let flags = TINFL_FLAG_COMPUTE_ADLER32; - let mut r = DecompressorOxide::new(); - let mut output_buf = vec![]; - // Check that we handle an empty buffer properly and not panicking. - // https://github.com/Frommi/miniz_oxide/issues/23 - let res = decompress(&mut r, &encoded, &mut output_buf, 0, flags); - assert_eq!(res, (TINFLStatus::HasMoreOutput, 2, 0)); - } -} diff --git a/vendor/miniz_oxide/src/inflate/mod.rs b/vendor/miniz_oxide/src/inflate/mod.rs deleted file mode 100644 index bb19e37..0000000 --- a/vendor/miniz_oxide/src/inflate/mod.rs +++ /dev/null @@ -1,337 +0,0 @@ -//! This module contains functionality for decompression. - -#[cfg(feature = "with-alloc")] -use crate::alloc::{boxed::Box, vec, vec::Vec}; -use ::core::usize; -#[cfg(all(feature = "std", feature = "with-alloc"))] -use std::error::Error; - -pub mod core; -mod output_buffer; -pub mod stream; -use self::core::*; - -const TINFL_STATUS_FAILED_CANNOT_MAKE_PROGRESS: i32 = -4; -const TINFL_STATUS_BAD_PARAM: i32 = -3; -const TINFL_STATUS_ADLER32_MISMATCH: i32 = -2; -const TINFL_STATUS_FAILED: i32 = -1; -const TINFL_STATUS_DONE: i32 = 0; -const TINFL_STATUS_NEEDS_MORE_INPUT: i32 = 1; -const TINFL_STATUS_HAS_MORE_OUTPUT: i32 = 2; - -/// Return status codes. -#[repr(i8)] -#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)] -pub enum TINFLStatus { - /// More input data was expected, but the caller indicated that there was no more data, so the - /// input stream is likely truncated. - /// - /// This can't happen if you have provided the - /// [`TINFL_FLAG_HAS_MORE_INPUT`][core::inflate_flags::TINFL_FLAG_HAS_MORE_INPUT] flag to the - /// decompression. By setting that flag, you indicate more input exists but is not provided, - /// and so reaching the end of the input data without finding the end of the compressed stream - /// would instead return a [`NeedsMoreInput`][Self::NeedsMoreInput] status. - FailedCannotMakeProgress = TINFL_STATUS_FAILED_CANNOT_MAKE_PROGRESS as i8, - - /// The output buffer is an invalid size; consider the `flags` parameter. - BadParam = TINFL_STATUS_BAD_PARAM as i8, - - /// The decompression went fine, but the adler32 checksum did not match the one - /// provided in the header. - Adler32Mismatch = TINFL_STATUS_ADLER32_MISMATCH as i8, - - /// Failed to decompress due to invalid data. - Failed = TINFL_STATUS_FAILED as i8, - - /// Finished decompression without issues. - /// - /// This indicates the end of the compressed stream has been reached. - Done = TINFL_STATUS_DONE as i8, - - /// The decompressor needs more input data to continue decompressing. - /// - /// This occurs when there's no more consumable input, but the end of the stream hasn't been - /// reached, and you have supplied the - /// [`TINFL_FLAG_HAS_MORE_INPUT`][core::inflate_flags::TINFL_FLAG_HAS_MORE_INPUT] flag to the - /// decompressor. Had you not supplied that flag (which would mean you were asserting that you - /// believed all the data was available) you would have gotten a - /// [`FailedCannotMakeProcess`][Self::FailedCannotMakeProgress] instead. - NeedsMoreInput = TINFL_STATUS_NEEDS_MORE_INPUT as i8, - - /// There is still pending data that didn't fit in the output buffer. - HasMoreOutput = TINFL_STATUS_HAS_MORE_OUTPUT as i8, -} - -impl TINFLStatus { - pub fn from_i32(value: i32) -> Option<TINFLStatus> { - use self::TINFLStatus::*; - match value { - TINFL_STATUS_FAILED_CANNOT_MAKE_PROGRESS => Some(FailedCannotMakeProgress), - TINFL_STATUS_BAD_PARAM => Some(BadParam), - TINFL_STATUS_ADLER32_MISMATCH => Some(Adler32Mismatch), - TINFL_STATUS_FAILED => Some(Failed), - TINFL_STATUS_DONE => Some(Done), - TINFL_STATUS_NEEDS_MORE_INPUT => Some(NeedsMoreInput), - TINFL_STATUS_HAS_MORE_OUTPUT => Some(HasMoreOutput), - _ => None, - } - } -} - -/// Struct return when decompress_to_vec functions fail. -#[cfg(feature = "with-alloc")] -#[derive(Debug)] -pub struct DecompressError { - /// Decompressor status on failure. See [TINFLStatus] for details. - pub status: TINFLStatus, - /// The currently decompressed data if any. - pub output: Vec<u8>, -} - -#[cfg(feature = "with-alloc")] -impl alloc::fmt::Display for DecompressError { - fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result { - f.write_str(match self.status { - TINFLStatus::FailedCannotMakeProgress => "Truncated input stream", - TINFLStatus::BadParam => "Invalid output buffer size", - TINFLStatus::Adler32Mismatch => "Adler32 checksum mismatch", - TINFLStatus::Failed => "Invalid input data", - TINFLStatus::Done => unreachable!(), - TINFLStatus::NeedsMoreInput => "Truncated input stream", - TINFLStatus::HasMoreOutput => "Output size exceeded the specified limit", - }) - } -} - -/// Implement Error trait only if std feature is requested as it requires std. -#[cfg(all(feature = "std", feature = "with-alloc"))] -impl Error for DecompressError {} - -#[cfg(feature = "with-alloc")] -fn decompress_error(status: TINFLStatus, output: Vec<u8>) -> Result<Vec<u8>, DecompressError> { - Err(DecompressError { status, output }) -} - -/// Decompress the deflate-encoded data in `input` to a vector. -/// -/// NOTE: This function will not bound the output, so if the output is large enough it can result in an out of memory error. -/// It is therefore suggested to not use this for anything other than test programs, use the functions with a specified limit, or -/// ideally streaming decompression via the [flate2](https://github.com/alexcrichton/flate2-rs) library instead. -/// -/// Returns a [`Result`] containing the [`Vec`] of decompressed data on success, and a [struct][DecompressError] containing the status and so far decompressed data if any on failure. -#[inline] -#[cfg(feature = "with-alloc")] -pub fn decompress_to_vec(input: &[u8]) -> Result<Vec<u8>, DecompressError> { - decompress_to_vec_inner(input, 0, usize::max_value()) -} - -/// Decompress the deflate-encoded data (with a zlib wrapper) in `input` to a vector. -/// -/// NOTE: This function will not bound the output, so if the output is large enough it can result in an out of memory error. -/// It is therefore suggested to not use this for anything other than test programs, use the functions with a specified limit, or -/// ideally streaming decompression via the [flate2](https://github.com/alexcrichton/flate2-rs) library instead. -/// -/// Returns a [`Result`] containing the [`Vec`] of decompressed data on success, and a [struct][DecompressError] containing the status and so far decompressed data if any on failure. -#[inline] -#[cfg(feature = "with-alloc")] -pub fn decompress_to_vec_zlib(input: &[u8]) -> Result<Vec<u8>, DecompressError> { - decompress_to_vec_inner( - input, - inflate_flags::TINFL_FLAG_PARSE_ZLIB_HEADER, - usize::max_value(), - ) -} - -/// Decompress the deflate-encoded data in `input` to a vector. -/// -/// The vector is grown to at most `max_size` bytes; if the data does not fit in that size, -/// the error [struct][DecompressError] will contain the status [`TINFLStatus::HasMoreOutput`] and the data that was decompressed on failure. -/// -/// As this function tries to decompress everything in one go, it's not ideal for general use outside of tests or where the output size is expected to be small. -/// It is suggested to use streaming decompression via the [flate2](https://github.com/alexcrichton/flate2-rs) library instead. -/// -/// Returns a [`Result`] containing the [`Vec`] of decompressed data on success, and a [struct][DecompressError] on failure. -#[inline] -#[cfg(feature = "with-alloc")] -pub fn decompress_to_vec_with_limit( - input: &[u8], - max_size: usize, -) -> Result<Vec<u8>, DecompressError> { - decompress_to_vec_inner(input, 0, max_size) -} - -/// Decompress the deflate-encoded data (with a zlib wrapper) in `input` to a vector. -/// The vector is grown to at most `max_size` bytes; if the data does not fit in that size, -/// the error [struct][DecompressError] will contain the status [`TINFLStatus::HasMoreOutput`] and the data that was decompressed on failure. -/// -/// As this function tries to decompress everything in one go, it's not ideal for general use outside of tests or where the output size is expected to be small. -/// It is suggested to use streaming decompression via the [flate2](https://github.com/alexcrichton/flate2-rs) library instead. -/// -/// Returns a [`Result`] containing the [`Vec`] of decompressed data on success, and a [struct][DecompressError] on failure. -#[inline] -#[cfg(feature = "with-alloc")] -pub fn decompress_to_vec_zlib_with_limit( - input: &[u8], - max_size: usize, -) -> Result<Vec<u8>, DecompressError> { - decompress_to_vec_inner(input, inflate_flags::TINFL_FLAG_PARSE_ZLIB_HEADER, max_size) -} - -/// Backend of various to-[`Vec`] decompressions. -/// -/// Returns [`Vec`] of decompressed data on success and the [error struct][DecompressError] with details on failure. -#[cfg(feature = "with-alloc")] -fn decompress_to_vec_inner( - input: &[u8], - flags: u32, - max_output_size: usize, -) -> Result<Vec<u8>, DecompressError> { - let flags = flags | inflate_flags::TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF; - let mut ret: Vec<u8> = vec![0; input.len().saturating_mul(2).min(max_output_size)]; - - let mut decomp = Box::<DecompressorOxide>::default(); - - let mut in_pos = 0; - let mut out_pos = 0; - loop { - // Wrap the whole output slice so we know we have enough of the - // decompressed data for matches. - let (status, in_consumed, out_consumed) = - decompress(&mut decomp, &input[in_pos..], &mut ret, out_pos, flags); - in_pos += in_consumed; - out_pos += out_consumed; - - match status { - TINFLStatus::Done => { - ret.truncate(out_pos); - return Ok(ret); - } - - TINFLStatus::HasMoreOutput => { - // if the buffer has already reached the size limit, return an error - if ret.len() >= max_output_size { - return decompress_error(TINFLStatus::HasMoreOutput, ret); - } - // calculate the new length, capped at `max_output_size` - let new_len = ret.len().saturating_mul(2).min(max_output_size); - ret.resize(new_len, 0); - } - - _ => return decompress_error(status, ret), - } - } -} - -/// Decompress one or more source slices from an iterator into the output slice. -/// -/// * On success, returns the number of bytes that were written. -/// * On failure, returns the failure status code. -/// -/// This will fail if the output buffer is not large enough, but in that case -/// the output buffer will still contain the partial decompression. -/// -/// * `out` the output buffer. -/// * `it` the iterator of input slices. -/// * `zlib_header` if the first slice out of the iterator is expected to have a -/// Zlib header. Otherwise the slices are assumed to be the deflate data only. -/// * `ignore_adler32` if the adler32 checksum should be calculated or not. -pub fn decompress_slice_iter_to_slice<'out, 'inp>( - out: &'out mut [u8], - it: impl Iterator<Item = &'inp [u8]>, - zlib_header: bool, - ignore_adler32: bool, -) -> Result<usize, TINFLStatus> { - use self::core::inflate_flags::*; - - let mut it = it.peekable(); - let r = &mut DecompressorOxide::new(); - let mut out_pos = 0; - while let Some(in_buf) = it.next() { - let has_more = it.peek().is_some(); - let flags = { - let mut f = TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF; - if zlib_header { - f |= TINFL_FLAG_PARSE_ZLIB_HEADER; - } - if ignore_adler32 { - f |= TINFL_FLAG_IGNORE_ADLER32; - } - if has_more { - f |= TINFL_FLAG_HAS_MORE_INPUT; - } - f - }; - let (status, _input_read, bytes_written) = decompress(r, in_buf, out, out_pos, flags); - out_pos += bytes_written; - match status { - TINFLStatus::NeedsMoreInput => continue, - TINFLStatus::Done => return Ok(out_pos), - e => return Err(e), - } - } - // If we ran out of source slices without getting a `Done` from the - // decompression we can call it a failure. - Err(TINFLStatus::FailedCannotMakeProgress) -} - -#[cfg(test)] -mod test { - use super::{ - decompress_slice_iter_to_slice, decompress_to_vec_zlib, decompress_to_vec_zlib_with_limit, - DecompressError, TINFLStatus, - }; - const ENCODED: [u8; 20] = [ - 120, 156, 243, 72, 205, 201, 201, 215, 81, 168, 202, 201, 76, 82, 4, 0, 27, 101, 4, 19, - ]; - - #[test] - fn decompress_vec() { - let res = decompress_to_vec_zlib(&ENCODED[..]).unwrap(); - assert_eq!(res.as_slice(), &b"Hello, zlib!"[..]); - } - - #[test] - fn decompress_vec_with_high_limit() { - let res = decompress_to_vec_zlib_with_limit(&ENCODED[..], 100_000).unwrap(); - assert_eq!(res.as_slice(), &b"Hello, zlib!"[..]); - } - - #[test] - fn fail_to_decompress_with_limit() { - let res = decompress_to_vec_zlib_with_limit(&ENCODED[..], 8); - match res { - Err(DecompressError { - status: TINFLStatus::HasMoreOutput, - .. - }) => (), // expected result - _ => panic!("Decompression output size limit was not enforced"), - } - } - - #[test] - fn test_decompress_slice_iter_to_slice() { - // one slice - let mut out = [0_u8; 12_usize]; - let r = - decompress_slice_iter_to_slice(&mut out, Some(&ENCODED[..]).into_iter(), true, false); - assert_eq!(r, Ok(12)); - assert_eq!(&out[..12], &b"Hello, zlib!"[..]); - - // some chunks at a time - for chunk_size in 1..13 { - // Note: because of https://github.com/Frommi/miniz_oxide/issues/110 our - // out buffer needs to have +1 byte available when the chunk size cuts - // the adler32 data off from the last actual data. - let mut out = [0_u8; 12_usize + 1]; - let r = - decompress_slice_iter_to_slice(&mut out, ENCODED.chunks(chunk_size), true, false); - assert_eq!(r, Ok(12)); - assert_eq!(&out[..12], &b"Hello, zlib!"[..]); - } - - // output buffer too small - let mut out = [0_u8; 3_usize]; - let r = decompress_slice_iter_to_slice(&mut out, ENCODED.chunks(7), true, false); - assert!(r.is_err()); - } -} diff --git a/vendor/miniz_oxide/src/inflate/output_buffer.rs b/vendor/miniz_oxide/src/inflate/output_buffer.rs deleted file mode 100644 index 5218a80..0000000 --- a/vendor/miniz_oxide/src/inflate/output_buffer.rs +++ /dev/null @@ -1,60 +0,0 @@ -/// A wrapper for the output slice used when decompressing. -/// -/// Using this rather than `Cursor` lets us implement the writing methods directly on -/// the buffer and lets us use a usize rather than u64 for the position which helps with -/// performance on 32-bit systems. -pub struct OutputBuffer<'a> { - slice: &'a mut [u8], - position: usize, -} - -impl<'a> OutputBuffer<'a> { - #[inline] - pub fn from_slice_and_pos(slice: &'a mut [u8], position: usize) -> OutputBuffer<'a> { - OutputBuffer { slice, position } - } - - #[inline] - pub const fn position(&self) -> usize { - self.position - } - - #[inline] - pub fn set_position(&mut self, position: usize) { - self.position = position; - } - - /// Write a byte to the current position and increment - /// - /// Assumes that there is space. - #[inline] - pub fn write_byte(&mut self, byte: u8) { - self.slice[self.position] = byte; - self.position += 1; - } - - /// Write a slice to the current position and increment - /// - /// Assumes that there is space. - #[inline] - pub fn write_slice(&mut self, data: &[u8]) { - let len = data.len(); - self.slice[self.position..self.position + len].copy_from_slice(data); - self.position += data.len(); - } - - #[inline] - pub const fn bytes_left(&self) -> usize { - self.slice.len() - self.position - } - - #[inline] - pub const fn get_ref(&self) -> &[u8] { - self.slice - } - - #[inline] - pub fn get_mut(&mut self) -> &mut [u8] { - self.slice - } -} diff --git a/vendor/miniz_oxide/src/inflate/stream.rs b/vendor/miniz_oxide/src/inflate/stream.rs deleted file mode 100644 index ee681b6..0000000 --- a/vendor/miniz_oxide/src/inflate/stream.rs +++ /dev/null @@ -1,418 +0,0 @@ -//! Extra streaming decompression functionality. -//! -//! As of now this is mainly intended for use to build a higher-level wrapper. -#[cfg(feature = "with-alloc")] -use crate::alloc::boxed::Box; -use core::{cmp, mem}; - -use crate::inflate::core::{decompress, inflate_flags, DecompressorOxide, TINFL_LZ_DICT_SIZE}; -use crate::inflate::TINFLStatus; -use crate::{DataFormat, MZError, MZFlush, MZResult, MZStatus, StreamResult}; - -/// Tag that determines reset policy of [InflateState](struct.InflateState.html) -pub trait ResetPolicy { - /// Performs reset - fn reset(&self, state: &mut InflateState); -} - -/// Resets state, without performing expensive ops (e.g. zeroing buffer) -/// -/// Note that not zeroing buffer can lead to security issues when dealing with untrusted input. -pub struct MinReset; - -impl ResetPolicy for MinReset { - fn reset(&self, state: &mut InflateState) { - state.decompressor().init(); - state.dict_ofs = 0; - state.dict_avail = 0; - state.first_call = true; - state.has_flushed = false; - state.last_status = TINFLStatus::NeedsMoreInput; - } -} - -/// Resets state and zero memory, continuing to use the same data format. -pub struct ZeroReset; - -impl ResetPolicy for ZeroReset { - #[inline] - fn reset(&self, state: &mut InflateState) { - MinReset.reset(state); - state.dict = [0; TINFL_LZ_DICT_SIZE]; - } -} - -/// Full reset of the state, including zeroing memory. -/// -/// Requires to provide new data format. -pub struct FullReset(pub DataFormat); - -impl ResetPolicy for FullReset { - #[inline] - fn reset(&self, state: &mut InflateState) { - ZeroReset.reset(state); - state.data_format = self.0; - } -} - -/// A struct that compbines a decompressor with extra data for streaming decompression. -/// -pub struct InflateState { - /// Inner decompressor struct - decomp: DecompressorOxide, - - /// Buffer of input bytes for matches. - /// TODO: Could probably do this a bit cleaner with some - /// Cursor-like class. - /// We may also look into whether we need to keep a buffer here, or just one in the - /// decompressor struct. - dict: [u8; TINFL_LZ_DICT_SIZE], - /// Where in the buffer are we currently at? - dict_ofs: usize, - /// How many bytes of data to be flushed is there currently in the buffer? - dict_avail: usize, - - first_call: bool, - has_flushed: bool, - - /// Whether the input data is wrapped in a zlib header and checksum. - /// TODO: This should be stored in the decompressor. - data_format: DataFormat, - last_status: TINFLStatus, -} - -impl Default for InflateState { - fn default() -> Self { - InflateState { - decomp: DecompressorOxide::default(), - dict: [0; TINFL_LZ_DICT_SIZE], - dict_ofs: 0, - dict_avail: 0, - first_call: true, - has_flushed: false, - data_format: DataFormat::Raw, - last_status: TINFLStatus::NeedsMoreInput, - } - } -} -impl InflateState { - /// Create a new state. - /// - /// Note that this struct is quite large due to internal buffers, and as such storing it on - /// the stack is not recommended. - /// - /// # Parameters - /// `data_format`: Determines whether the compressed data is assumed to wrapped with zlib - /// metadata. - pub fn new(data_format: DataFormat) -> InflateState { - InflateState { - data_format, - ..Default::default() - } - } - - /// Create a new state on the heap. - /// - /// # Parameters - /// `data_format`: Determines whether the compressed data is assumed to wrapped with zlib - /// metadata. - #[cfg(feature = "with-alloc")] - pub fn new_boxed(data_format: DataFormat) -> Box<InflateState> { - let mut b: Box<InflateState> = Box::default(); - b.data_format = data_format; - b - } - - /// Access the innner decompressor. - pub fn decompressor(&mut self) -> &mut DecompressorOxide { - &mut self.decomp - } - - /// Return the status of the last call to `inflate` with this `InflateState`. - pub const fn last_status(&self) -> TINFLStatus { - self.last_status - } - - /// Create a new state using miniz/zlib style window bits parameter. - /// - /// The decompressor does not support different window sizes. As such, - /// any positive (>0) value will set the zlib header flag, while a negative one - /// will not. - #[cfg(feature = "with-alloc")] - pub fn new_boxed_with_window_bits(window_bits: i32) -> Box<InflateState> { - let mut b: Box<InflateState> = Box::default(); - b.data_format = DataFormat::from_window_bits(window_bits); - b - } - - #[inline] - /// Reset the decompressor without re-allocating memory, using the given - /// data format. - pub fn reset(&mut self, data_format: DataFormat) { - self.reset_as(FullReset(data_format)); - } - - #[inline] - /// Resets the state according to specified policy. - pub fn reset_as<T: ResetPolicy>(&mut self, policy: T) { - policy.reset(self) - } -} - -/// Try to decompress from `input` to `output` with the given [`InflateState`] -/// -/// # `flush` -/// -/// Generally, the various [`MZFlush`] flags have meaning only on the compression side. They can be -/// supplied here, but the only one that has any semantic meaning is [`MZFlush::Finish`], which is a -/// signal that the stream is expected to finish, and failing to do so is an error. It isn't -/// necessary to specify it when the stream ends; you'll still get returned a -/// [`MZStatus::StreamEnd`] anyway. Other values either have no effect or cause errors. It's -/// likely that you'll almost always just want to use [`MZFlush::None`]. -/// -/// # 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 with [`MZFlush::Finish`] and input wasn't all -/// consumed. -/// -/// Returns [`MZError::Data`] if this or a a previous call failed with an error return from -/// [`TINFLStatus`]; probably indicates corrupted data. -/// -/// Returns [`MZError::Stream`] when called with [`MZFlush::Full`] (meaningless on -/// decompression), or when called without [`MZFlush::Finish`] after an earlier call with -/// [`MZFlush::Finish`] has been made. -pub fn inflate( - state: &mut InflateState, - input: &[u8], - output: &mut [u8], - flush: MZFlush, -) -> StreamResult { - let mut bytes_consumed = 0; - let mut bytes_written = 0; - let mut next_in = input; - let mut next_out = output; - - if flush == MZFlush::Full { - return StreamResult::error(MZError::Stream); - } - - let mut decomp_flags = if state.data_format == DataFormat::Zlib { - inflate_flags::TINFL_FLAG_COMPUTE_ADLER32 - } else { - inflate_flags::TINFL_FLAG_IGNORE_ADLER32 - }; - - if (state.data_format == DataFormat::Zlib) - | (state.data_format == DataFormat::ZLibIgnoreChecksum) - { - decomp_flags |= inflate_flags::TINFL_FLAG_PARSE_ZLIB_HEADER; - } - - let first_call = state.first_call; - state.first_call = false; - if (state.last_status as i32) < 0 { - return StreamResult::error(MZError::Data); - } - - if state.has_flushed && (flush != MZFlush::Finish) { - return StreamResult::error(MZError::Stream); - } - state.has_flushed |= flush == MZFlush::Finish; - - if (flush == MZFlush::Finish) && first_call { - decomp_flags |= inflate_flags::TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF; - - let status = decompress(&mut state.decomp, next_in, next_out, 0, decomp_flags); - let in_bytes = status.1; - let out_bytes = status.2; - let status = status.0; - - state.last_status = status; - - bytes_consumed += in_bytes; - bytes_written += out_bytes; - - let ret_status = { - if (status as i32) < 0 { - Err(MZError::Data) - } else if status != TINFLStatus::Done { - state.last_status = TINFLStatus::Failed; - Err(MZError::Buf) - } else { - Ok(MZStatus::StreamEnd) - } - }; - return StreamResult { - bytes_consumed, - bytes_written, - status: ret_status, - }; - } - - if flush != MZFlush::Finish { - decomp_flags |= inflate_flags::TINFL_FLAG_HAS_MORE_INPUT; - } - - if state.dict_avail != 0 { - bytes_written += push_dict_out(state, &mut next_out); - return StreamResult { - bytes_consumed, - bytes_written, - status: Ok( - if (state.last_status == TINFLStatus::Done) && (state.dict_avail == 0) { - MZStatus::StreamEnd - } else { - MZStatus::Ok - }, - ), - }; - } - - let status = inflate_loop( - state, - &mut next_in, - &mut next_out, - &mut bytes_consumed, - &mut bytes_written, - decomp_flags, - flush, - ); - StreamResult { - bytes_consumed, - bytes_written, - status, - } -} - -fn inflate_loop( - state: &mut InflateState, - next_in: &mut &[u8], - next_out: &mut &mut [u8], - total_in: &mut usize, - total_out: &mut usize, - decomp_flags: u32, - flush: MZFlush, -) -> MZResult { - let orig_in_len = next_in.len(); - loop { - let status = decompress( - &mut state.decomp, - *next_in, - &mut state.dict, - state.dict_ofs, - decomp_flags, - ); - - let in_bytes = status.1; - let out_bytes = status.2; - let status = status.0; - - state.last_status = status; - - *next_in = &next_in[in_bytes..]; - *total_in += in_bytes; - - state.dict_avail = out_bytes; - *total_out += push_dict_out(state, next_out); - - // The stream was corrupted, and decompression failed. - if (status as i32) < 0 { - return Err(MZError::Data); - } - - // The decompressor has flushed all it's data and is waiting for more input, but - // there was no more input provided. - if (status == TINFLStatus::NeedsMoreInput) && orig_in_len == 0 { - return Err(MZError::Buf); - } - - if flush == MZFlush::Finish { - if status == TINFLStatus::Done { - // There is not enough space in the output buffer to flush the remaining - // decompressed data in the internal buffer. - return if state.dict_avail != 0 { - Err(MZError::Buf) - } else { - Ok(MZStatus::StreamEnd) - }; - // No more space in the output buffer, but we're not done. - } else if next_out.is_empty() { - return Err(MZError::Buf); - } - } else { - // We're not expected to finish, so it's fine if we can't flush everything yet. - let empty_buf = next_in.is_empty() || next_out.is_empty(); - if (status == TINFLStatus::Done) || empty_buf || (state.dict_avail != 0) { - return if (status == TINFLStatus::Done) && (state.dict_avail == 0) { - // No more data left, we're done. - Ok(MZStatus::StreamEnd) - } else { - // Ok for now, still waiting for more input data or output space. - Ok(MZStatus::Ok) - }; - } - } - } -} - -fn push_dict_out(state: &mut InflateState, next_out: &mut &mut [u8]) -> usize { - let n = cmp::min(state.dict_avail as usize, next_out.len()); - (next_out[..n]).copy_from_slice(&state.dict[state.dict_ofs..state.dict_ofs + n]); - *next_out = &mut mem::take(next_out)[n..]; - state.dict_avail -= n; - state.dict_ofs = (state.dict_ofs + (n)) & (TINFL_LZ_DICT_SIZE - 1); - n -} - -#[cfg(test)] -mod test { - use super::{inflate, InflateState}; - use crate::{DataFormat, MZFlush, MZStatus}; - use alloc::vec; - - #[test] - fn test_state() { - let encoded = [ - 120u8, 156, 243, 72, 205, 201, 201, 215, 81, 168, 202, 201, 76, 82, 4, 0, 27, 101, 4, - 19, - ]; - let mut out = vec![0; 50]; - let mut state = InflateState::new_boxed(DataFormat::Zlib); - let res = inflate(&mut state, &encoded, &mut out, MZFlush::Finish); - let status = res.status.expect("Failed to decompress!"); - assert_eq!(status, MZStatus::StreamEnd); - assert_eq!(out[..res.bytes_written as usize], b"Hello, zlib!"[..]); - assert_eq!(res.bytes_consumed, encoded.len()); - - state.reset_as(super::ZeroReset); - out.iter_mut().map(|x| *x = 0).count(); - let res = inflate(&mut state, &encoded, &mut out, MZFlush::Finish); - let status = res.status.expect("Failed to decompress!"); - assert_eq!(status, MZStatus::StreamEnd); - assert_eq!(out[..res.bytes_written as usize], b"Hello, zlib!"[..]); - assert_eq!(res.bytes_consumed, encoded.len()); - - state.reset_as(super::MinReset); - out.iter_mut().map(|x| *x = 0).count(); - let res = inflate(&mut state, &encoded, &mut out, MZFlush::Finish); - let status = res.status.expect("Failed to decompress!"); - assert_eq!(status, MZStatus::StreamEnd); - assert_eq!(out[..res.bytes_written as usize], b"Hello, zlib!"[..]); - assert_eq!(res.bytes_consumed, encoded.len()); - assert_eq!(state.decompressor().adler32(), Some(459605011)); - - // Test state when not computing adler. - state = InflateState::new_boxed(DataFormat::ZLibIgnoreChecksum); - out.iter_mut().map(|x| *x = 0).count(); - let res = inflate(&mut state, &encoded, &mut out, MZFlush::Finish); - let status = res.status.expect("Failed to decompress!"); - assert_eq!(status, MZStatus::StreamEnd); - assert_eq!(out[..res.bytes_written as usize], b"Hello, zlib!"[..]); - assert_eq!(res.bytes_consumed, encoded.len()); - // Not computed, so should be Some(1) - assert_eq!(state.decompressor().adler32(), Some(1)); - // Should still have the checksum read from the header file. - assert_eq!(state.decompressor().adler32_header(), Some(459605011)) - } -} |