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26c7fdadcb
Update the LZ4 compression module based on LZ4 v1.8.3 in order to use the newest LZ4_decompress_safe_partial() which can now decode exactly the nb of bytes requested. Signed-off-by: Huang Jianan <jnhuang95@gmail.com>
74 lines
2.8 KiB
C
74 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright 2019 Google LLC
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*/
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#ifndef __LZ4_H
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#define __LZ4_H
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/**
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* ulz4fn() - Decompress LZ4 data
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*
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* @src: Source data to decompress
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* @srcn: Length of source data
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* @dst: Destination for uncompressed data
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* @dstn: Returns length of uncompressed data
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* Return: 0 if OK, -EPROTONOSUPPORT if the magic number or version number are
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* not recognised or independent blocks are used, -EINVAL if the reserved
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* fields are non-zero, or input is overrun, -EENOBUFS if the destination
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* buffer is overrun, -EEPROTO if the compressed data causes an error in
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* the decompression algorithm
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*/
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int ulz4fn(const void *src, size_t srcn, void *dst, size_t *dstn);
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/**
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* LZ4_decompress_safe() - Decompression protected against buffer overflow
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* @source: source address of the compressed data
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* @dest: output buffer address of the uncompressed data
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* which must be already allocated
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* @compressedSize: is the precise full size of the compressed block
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* @maxDecompressedSize: is the size of 'dest' buffer
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*
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* Decompresses data from 'source' into 'dest'.
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* If the source stream is detected malformed, the function will
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* stop decoding and return a negative result.
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* This function is protected against buffer overflow exploits,
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* including malicious data packets. It never writes outside output buffer,
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* nor reads outside input buffer.
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*
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* Return: number of bytes decompressed into destination buffer
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* (necessarily <= maxDecompressedSize)
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* or a negative result in case of error
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*/
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int LZ4_decompress_safe(const char *source, char *dest,
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int compressedSize, int maxDecompressedSize);
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/**
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* LZ4_decompress_safe_partial() - Decompress a block of size 'compressedSize'
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* at position 'source' into buffer 'dest'
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* @source: source address of the compressed data
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* @dest: output buffer address of the decompressed data which must be
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* already allocated
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* @compressedSize: is the precise full size of the compressed block.
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* @targetOutputSize: the decompression operation will try
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* to stop as soon as 'targetOutputSize' has been reached
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* @maxDecompressedSize: is the size of destination buffer
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*
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* This function decompresses a compressed block of size 'compressedSize'
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* at position 'source' into destination buffer 'dest'
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* of size 'maxDecompressedSize'.
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* The function tries to stop decompressing operation as soon as
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* 'targetOutputSize' has been reached, reducing decompression time.
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* This function never writes outside of output buffer,
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* and never reads outside of input buffer.
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* It is therefore protected against malicious data packets.
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*
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* Return: the number of bytes decoded in the destination buffer
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* (necessarily <= maxDecompressedSize)
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* or a negative result in case of error
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*
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*/
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int LZ4_decompress_safe_partial(const char *src, char *dst,
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int compressedSize, int targetOutputSize, int dstCapacity);
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#endif
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