FastLZ: Update to upstream version 0.5.0
Upstream development restarted after 13 years. Changes:
2020-02-02: Version 0.5.0
Minor speed improvement on the decompressor.
Prevent memory violation when decompressing corrupted input.
2020-01-10: Version 0.4.0
Only code & infrastructure clean-up, no new functionality.
(cherry picked from commit 5167c9186a)
This commit is contained in:
Rémi Verschelde
parent
0da84b50c0
commit
2cf6624965
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@ -253,7 +253,7 @@ License: BSD-3-clause
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Files: ./thirdparty/misc/fastlz.c
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./thirdparty/misc/fastlz.h
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Comment: FastLZ
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Copyright: 2005-2007, Ariya Hidayat
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Copyright: 2005-2020, Ariya Hidayat
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License: Expat
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Files: ./thirdparty/misc/hq2x.cpp
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@ -324,7 +324,7 @@ Collection of single-file libraries used in Godot components.
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* License: BSL-1.0
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- `fastlz.{c,h}`
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* Upstream: https://github.com/ariya/FastLZ
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* Version: git (f121734, 2007)
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* Version: 0.5.0 (4f20f54d46f5a6dd4fae4def134933369b7602d2, 2020)
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* License: MIT
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- `hq2x.{cpp,h}`
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* Upstream: https://github.com/brunexgeek/hqx
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@ -1,9 +1,6 @@
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/*
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FastLZ - lightning-fast lossless compression library
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Copyright (C) 2007 Ariya Hidayat (ariya@kde.org)
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Copyright (C) 2006 Ariya Hidayat (ariya@kde.org)
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Copyright (C) 2005 Ariya Hidayat (ariya@kde.org)
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/*
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FastLZ - Byte-aligned LZ77 compression library
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Copyright (C) 2005-2020 Ariya Hidayat <ariya.hidayat@gmail.com>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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@ -24,274 +21,148 @@
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THE SOFTWARE.
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*/
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#if !defined(FASTLZ_COMPRESSOR) && !defined(FASTLZ_DECOMPRESSOR)
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#include "fastlz.h"
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#include <stdint.h>
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/*
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* Always check for bound when decompressing.
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* Generally it is best to leave it defined.
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*/
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#define FASTLZ_SAFE
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#if defined(FASTLZ_USE_SAFE_DECOMPRESSOR) && (FASTLZ_USE_SAFE_DECOMPRESSOR == 0)
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#undef FASTLZ_SAFE
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#endif
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/*
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* Give hints to the compiler for branch prediction optimization.
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*/
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#if defined(__GNUC__) && (__GNUC__ > 2)
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#define FASTLZ_EXPECT_CONDITIONAL(c) (__builtin_expect((c), 1))
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#define FASTLZ_UNEXPECT_CONDITIONAL(c) (__builtin_expect((c), 0))
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#if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ > 2))
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#define FASTLZ_LIKELY(c) (__builtin_expect(!!(c), 1))
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#define FASTLZ_UNLIKELY(c) (__builtin_expect(!!(c), 0))
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#else
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#define FASTLZ_EXPECT_CONDITIONAL(c) (c)
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#define FASTLZ_UNEXPECT_CONDITIONAL(c) (c)
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#define FASTLZ_LIKELY(c) (c)
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#define FASTLZ_UNLIKELY(c) (c)
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#endif
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/*
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* Use inlined functions for supported systems.
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*/
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#if defined(__GNUC__) || defined(__DMC__) || defined(__POCC__) || defined(__WATCOMC__) || defined(__SUNPRO_C)
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#define FASTLZ_INLINE inline
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#elif defined(__BORLANDC__) || defined(_MSC_VER) || defined(__LCC__)
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#define FASTLZ_INLINE __inline
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#else
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#define FASTLZ_INLINE
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#endif
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/*
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* Prevent accessing more than 8-bit at once, except on x86 architectures.
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*/
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#if !defined(FASTLZ_STRICT_ALIGN)
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#define FASTLZ_STRICT_ALIGN
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#if defined(__i386__) || defined(__386) /* GNU C, Sun Studio */
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#undef FASTLZ_STRICT_ALIGN
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#elif defined(__i486__) || defined(__i586__) || defined(__i686__) /* GNU C */
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#undef FASTLZ_STRICT_ALIGN
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#elif defined(_M_IX86) /* Intel, MSVC */
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#undef FASTLZ_STRICT_ALIGN
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#elif defined(__386)
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#undef FASTLZ_STRICT_ALIGN
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#elif defined(_X86_) /* MinGW */
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#undef FASTLZ_STRICT_ALIGN
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#elif defined(__I86__) /* Digital Mars */
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#undef FASTLZ_STRICT_ALIGN
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#endif
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#endif
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/*
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* FIXME: use preprocessor magic to set this on different platforms!
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*/
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typedef unsigned char flzuint8;
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typedef unsigned short flzuint16;
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typedef unsigned int flzuint32;
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/* prototypes */
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int fastlz_compress(const void* input, int length, void* output);
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int fastlz_compress_level(int level, const void* input, int length, void* output);
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int fastlz_decompress(const void* input, int length, void* output, int maxout);
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#define MAX_COPY 32
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#define MAX_LEN 264 /* 256 + 8 */
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#define MAX_DISTANCE 8192
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#if !defined(FASTLZ_STRICT_ALIGN)
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#define FASTLZ_READU16(p) *((const flzuint16*)(p))
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#if defined(FASTLZ_SAFE)
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#define FASTLZ_BOUND_CHECK(cond) \
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if (FASTLZ_UNLIKELY(!(cond))) return 0;
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#else
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#define FASTLZ_READU16(p) ((p)[0] | (p)[1]<<8)
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#define FASTLZ_BOUND_CHECK(cond) \
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do { \
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} while (0)
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#endif
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#define HASH_LOG 13
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#define HASH_SIZE (1<< HASH_LOG)
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#define HASH_MASK (HASH_SIZE-1)
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#define HASH_FUNCTION(v,p) { v = FASTLZ_READU16(p); v ^= FASTLZ_READU16(p+1)^(v>>(16-HASH_LOG));v &= HASH_MASK; }
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#define MAX_COPY 32
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#define MAX_LEN 264 /* 256 + 8 */
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#define MAX_L1_DISTANCE 8192
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#define MAX_L2_DISTANCE 8191
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#define MAX_FARDISTANCE (65535 + MAX_L2_DISTANCE - 1)
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#undef FASTLZ_LEVEL
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#define FASTLZ_LEVEL 1
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#define FASTLZ_READU16(p) ((p)[0] | (p)[1] << 8)
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#undef FASTLZ_COMPRESSOR
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#undef FASTLZ_DECOMPRESSOR
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#define FASTLZ_COMPRESSOR fastlz1_compress
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#define FASTLZ_DECOMPRESSOR fastlz1_decompress
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static FASTLZ_INLINE int FASTLZ_COMPRESSOR(const void* input, int length, void* output);
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static FASTLZ_INLINE int FASTLZ_DECOMPRESSOR(const void* input, int length, void* output, int maxout);
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#include "fastlz.c"
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#define HASH_LOG 13
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#define HASH_SIZE (1 << HASH_LOG)
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#define HASH_MASK (HASH_SIZE - 1)
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#define HASH_FUNCTION(v, p) \
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{ \
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v = FASTLZ_READU16(p); \
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v ^= FASTLZ_READU16(p + 1) ^ (v >> (16 - HASH_LOG)); \
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v &= HASH_MASK; \
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}
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#undef FASTLZ_LEVEL
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#define FASTLZ_LEVEL 2
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int fastlz1_compress(const void* input, int length, void* output) {
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const uint8_t* ip = (const uint8_t*)input;
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const uint8_t* ip_bound = ip + length - 2;
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const uint8_t* ip_limit = ip + length - 12 - 1;
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uint8_t* op = (uint8_t*)output;
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#undef MAX_DISTANCE
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#define MAX_DISTANCE 8191
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#define MAX_FARDISTANCE (65535+MAX_DISTANCE-1)
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const uint8_t* htab[HASH_SIZE];
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uint32_t hval;
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#undef FASTLZ_COMPRESSOR
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#undef FASTLZ_DECOMPRESSOR
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#define FASTLZ_COMPRESSOR fastlz2_compress
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#define FASTLZ_DECOMPRESSOR fastlz2_decompress
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static FASTLZ_INLINE int FASTLZ_COMPRESSOR(const void* input, int length, void* output);
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static FASTLZ_INLINE int FASTLZ_DECOMPRESSOR(const void* input, int length, void* output, int maxout);
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#include "fastlz.c"
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int fastlz_compress(const void* input, int length, void* output)
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{
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/* for short block, choose fastlz1 */
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if(length < 65536)
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return fastlz1_compress(input, length, output);
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/* else... */
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return fastlz2_compress(input, length, output);
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}
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int fastlz_decompress(const void* input, int length, void* output, int maxout)
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{
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/* magic identifier for compression level */
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int level = ((*(const flzuint8*)input) >> 5) + 1;
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if(level == 1)
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return fastlz1_decompress(input, length, output, maxout);
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if(level == 2)
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return fastlz2_decompress(input, length, output, maxout);
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/* unknown level, trigger error */
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return 0;
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}
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int fastlz_compress_level(int level, const void* input, int length, void* output)
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{
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if(level == 1)
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return fastlz1_compress(input, length, output);
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if(level == 2)
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return fastlz2_compress(input, length, output);
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return 0;
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}
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#else /* !defined(FASTLZ_COMPRESSOR) && !defined(FASTLZ_DECOMPRESSOR) */
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static FASTLZ_INLINE int FASTLZ_COMPRESSOR(const void* input, int length, void* output)
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{
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const flzuint8* ip = (const flzuint8*) input;
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const flzuint8* ip_bound = ip + length - 2;
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const flzuint8* ip_limit = ip + length - 12;
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flzuint8* op = (flzuint8*) output;
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const flzuint8* htab[HASH_SIZE];
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const flzuint8** hslot;
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flzuint32 hval;
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flzuint32 copy;
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uint32_t copy;
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/* sanity check */
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if(FASTLZ_UNEXPECT_CONDITIONAL(length < 4))
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{
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if(length)
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{
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if (FASTLZ_UNLIKELY(length < 4)) {
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if (length) {
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/* create literal copy only */
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*op++ = length-1;
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*op++ = length - 1;
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ip_bound++;
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while(ip <= ip_bound)
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*op++ = *ip++;
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return length+1;
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}
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else
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while (ip <= ip_bound) *op++ = *ip++;
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return length + 1;
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} else
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return 0;
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}
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/* initializes hash table */
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for (hslot = htab; hslot < htab + HASH_SIZE; hslot++)
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*hslot = ip;
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for (hval = 0; hval < HASH_SIZE; ++hval) htab[hval] = ip;
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/* we start with literal copy */
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copy = 2;
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*op++ = MAX_COPY-1;
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*op++ = MAX_COPY - 1;
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*op++ = *ip++;
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*op++ = *ip++;
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/* main loop */
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while(FASTLZ_EXPECT_CONDITIONAL(ip < ip_limit))
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{
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const flzuint8* ref;
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flzuint32 distance;
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while (FASTLZ_LIKELY(ip < ip_limit)) {
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const uint8_t* ref;
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uint32_t distance;
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/* minimum match length */
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flzuint32 len = 3;
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uint32_t len = 3;
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/* comparison starting-point */
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const flzuint8* anchor = ip;
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/* check for a run */
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#if FASTLZ_LEVEL==2
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if(ip[0] == ip[-1] && FASTLZ_READU16(ip-1)==FASTLZ_READU16(ip+1))
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{
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distance = 1;
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ip += 3;
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ref = anchor - 1 + 3;
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goto match;
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}
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#endif
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const uint8_t* anchor = ip;
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/* find potential match */
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HASH_FUNCTION(hval,ip);
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hslot = htab + hval;
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HASH_FUNCTION(hval, ip);
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ref = htab[hval];
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/* update hash table */
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htab[hval] = anchor;
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/* calculate distance to the match */
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distance = anchor - ref;
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/* update hash table */
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*hslot = anchor;
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/* is this a match? check the first 3 bytes */
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if(distance==0 ||
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#if FASTLZ_LEVEL==1
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(distance >= MAX_DISTANCE) ||
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#else
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(distance >= MAX_FARDISTANCE) ||
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#endif
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*ref++ != *ip++ || *ref++!=*ip++ || *ref++!=*ip++)
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if (distance == 0 || (distance >= MAX_L1_DISTANCE) || *ref++ != *ip++ ||
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*ref++ != *ip++ || *ref++ != *ip++)
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goto literal;
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#if FASTLZ_LEVEL==2
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/* far, needs at least 5-byte match */
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if(distance >= MAX_DISTANCE)
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{
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if(*ip++ != *ref++ || *ip++!= *ref++)
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goto literal;
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len += 2;
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}
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match:
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#endif
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/* last matched byte */
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ip = anchor + len;
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/* distance is biased */
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distance--;
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if(!distance)
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{
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if (!distance) {
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/* zero distance means a run */
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flzuint8 x = ip[-1];
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while(ip < ip_bound)
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if(*ref++ != x) break; else ip++;
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}
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else
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for(;;)
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{
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/* safe because the outer check against ip limit */
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if(*ref++ != *ip++) break;
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if(*ref++ != *ip++) break;
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if(*ref++ != *ip++) break;
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if(*ref++ != *ip++) break;
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if(*ref++ != *ip++) break;
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if(*ref++ != *ip++) break;
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if(*ref++ != *ip++) break;
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if(*ref++ != *ip++) break;
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while(ip < ip_bound)
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if(*ref++ != *ip++) break;
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break;
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}
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uint8_t x = ip[-1];
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while (ip < ip_bound)
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if (*ref++ != x)
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break;
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else
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ip++;
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} else
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for (;;) {
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/* safe because the outer check against ip limit */
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if (*ref++ != *ip++) break;
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if (*ref++ != *ip++) break;
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if (*ref++ != *ip++) break;
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if (*ref++ != *ip++) break;
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if (*ref++ != *ip++) break;
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if (*ref++ != *ip++) break;
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if (*ref++ != *ip++) break;
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if (*ref++ != *ip++) break;
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while (ip < ip_bound)
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if (*ref++ != *ip++) break;
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break;
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}
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/* if we have copied something, adjust the copy count */
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if(copy)
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/* copy is biased, '0' means 1 byte copy */
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*(op-copy-1) = copy-1;
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if (copy) /* copy is biased, '0' means 1 byte copy */
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*(op - copy - 1) = copy - 1;
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else
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/* back, to overwrite the copy count */
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op--;
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@ -304,248 +175,417 @@ static FASTLZ_INLINE int FASTLZ_COMPRESSOR(const void* input, int length, void*
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len = ip - anchor;
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/* encode the match */
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#if FASTLZ_LEVEL==2
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if(distance < MAX_DISTANCE)
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{
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if(len < 7)
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{
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*op++ = (len << 5) + (distance >> 8);
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*op++ = (distance & 255);
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}
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else
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{
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if (FASTLZ_UNLIKELY(len > MAX_LEN - 2))
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while (len > MAX_LEN - 2) {
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*op++ = (7 << 5) + (distance >> 8);
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for(len-=7; len >= 255; len-= 255)
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*op++ = 255;
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*op++ = len;
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*op++ = MAX_LEN - 2 - 7 - 2;
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*op++ = (distance & 255);
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}
|
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}
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else
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{
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/* far away, but not yet in the another galaxy... */
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if(len < 7)
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{
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distance -= MAX_DISTANCE;
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*op++ = (len << 5) + 31;
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*op++ = 255;
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*op++ = distance >> 8;
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*op++ = distance & 255;
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}
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else
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{
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distance -= MAX_DISTANCE;
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*op++ = (7 << 5) + 31;
|
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for(len-=7; len >= 255; len-= 255)
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*op++ = 255;
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*op++ = len;
|
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*op++ = 255;
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*op++ = distance >> 8;
|
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*op++ = distance & 255;
|
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}
|
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}
|
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#else
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|
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if(FASTLZ_UNEXPECT_CONDITIONAL(len > MAX_LEN-2))
|
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while(len > MAX_LEN-2)
|
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{
|
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*op++ = (7 << 5) + (distance >> 8);
|
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*op++ = MAX_LEN - 2 - 7 -2;
|
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*op++ = (distance & 255);
|
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len -= MAX_LEN-2;
|
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len -= MAX_LEN - 2;
|
||||
}
|
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|
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if(len < 7)
|
||||
{
|
||||
if (len < 7) {
|
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*op++ = (len << 5) + (distance >> 8);
|
||||
*op++ = (distance & 255);
|
||||
}
|
||||
else
|
||||
{
|
||||
} else {
|
||||
*op++ = (7 << 5) + (distance >> 8);
|
||||
*op++ = len - 7;
|
||||
*op++ = (distance & 255);
|
||||
}
|
||||
#endif
|
||||
|
||||
/* update the hash at match boundary */
|
||||
HASH_FUNCTION(hval,ip);
|
||||
HASH_FUNCTION(hval, ip);
|
||||
htab[hval] = ip++;
|
||||
HASH_FUNCTION(hval,ip);
|
||||
HASH_FUNCTION(hval, ip);
|
||||
htab[hval] = ip++;
|
||||
|
||||
/* assuming literal copy */
|
||||
*op++ = MAX_COPY-1;
|
||||
*op++ = MAX_COPY - 1;
|
||||
|
||||
continue;
|
||||
|
||||
literal:
|
||||
*op++ = *anchor++;
|
||||
ip = anchor;
|
||||
copy++;
|
||||
if(FASTLZ_UNEXPECT_CONDITIONAL(copy == MAX_COPY))
|
||||
{
|
||||
copy = 0;
|
||||
*op++ = MAX_COPY-1;
|
||||
}
|
||||
literal:
|
||||
*op++ = *anchor++;
|
||||
ip = anchor;
|
||||
copy++;
|
||||
if (FASTLZ_UNLIKELY(copy == MAX_COPY)) {
|
||||
copy = 0;
|
||||
*op++ = MAX_COPY - 1;
|
||||
}
|
||||
}
|
||||
|
||||
/* left-over as literal copy */
|
||||
ip_bound++;
|
||||
while(ip <= ip_bound)
|
||||
{
|
||||
while (ip <= ip_bound) {
|
||||
*op++ = *ip++;
|
||||
copy++;
|
||||
if(copy == MAX_COPY)
|
||||
{
|
||||
if (copy == MAX_COPY) {
|
||||
copy = 0;
|
||||
*op++ = MAX_COPY-1;
|
||||
*op++ = MAX_COPY - 1;
|
||||
}
|
||||
}
|
||||
|
||||
/* if we have copied something, adjust the copy length */
|
||||
if(copy)
|
||||
*(op-copy-1) = copy-1;
|
||||
if (copy)
|
||||
*(op - copy - 1) = copy - 1;
|
||||
else
|
||||
op--;
|
||||
|
||||
#if FASTLZ_LEVEL==2
|
||||
/* marker for fastlz2 */
|
||||
*(flzuint8*)output |= (1 << 5);
|
||||
#endif
|
||||
|
||||
return op - (flzuint8*)output;
|
||||
return op - (uint8_t*)output;
|
||||
}
|
||||
|
||||
static FASTLZ_INLINE int FASTLZ_DECOMPRESSOR(const void* input, int length, void* output, int maxout)
|
||||
{
|
||||
const flzuint8* ip = (const flzuint8*) input;
|
||||
const flzuint8* ip_limit = ip + length;
|
||||
flzuint8* op = (flzuint8*) output;
|
||||
flzuint8* op_limit = op + maxout;
|
||||
flzuint32 ctrl = (*ip++) & 31;
|
||||
int loop = 1;
|
||||
#if defined(FASTLZ_USE_MEMMOVE) && (FASTLZ_USE_MEMMOVE == 0)
|
||||
|
||||
do
|
||||
{
|
||||
const flzuint8* ref = op;
|
||||
flzuint32 len = ctrl >> 5;
|
||||
flzuint32 ofs = (ctrl & 31) << 8;
|
||||
static void fastlz_memmove(uint8_t* dest, const uint8_t* src, uint32_t count) {
|
||||
do {
|
||||
*dest++ = *src++;
|
||||
} while (--count);
|
||||
}
|
||||
|
||||
static void fastlz_memcpy(uint8_t* dest, const uint8_t* src, uint32_t count) {
|
||||
return fastlz_memmove(dest, src, count);
|
||||
}
|
||||
|
||||
if(ctrl >= 32)
|
||||
{
|
||||
#if FASTLZ_LEVEL==2
|
||||
flzuint8 code;
|
||||
#endif
|
||||
len--;
|
||||
ref -= ofs;
|
||||
if (len == 7-1)
|
||||
#if FASTLZ_LEVEL==1
|
||||
len += *ip++;
|
||||
ref -= *ip++;
|
||||
#else
|
||||
do
|
||||
{
|
||||
code = *ip++;
|
||||
len += code;
|
||||
} while (code==255);
|
||||
code = *ip++;
|
||||
ref -= code;
|
||||
|
||||
/* match from 16-bit distance */
|
||||
if(FASTLZ_UNEXPECT_CONDITIONAL(code==255))
|
||||
if(FASTLZ_EXPECT_CONDITIONAL(ofs==(31 << 8)))
|
||||
{
|
||||
ofs = (*ip++) << 8;
|
||||
ofs += *ip++;
|
||||
ref = op - ofs - MAX_DISTANCE;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef FASTLZ_SAFE
|
||||
if (FASTLZ_UNEXPECT_CONDITIONAL(op + len + 3 > op_limit))
|
||||
return 0;
|
||||
#include <string.h>
|
||||
|
||||
if (FASTLZ_UNEXPECT_CONDITIONAL(ref-1 < (flzuint8 *)output))
|
||||
return 0;
|
||||
#endif
|
||||
|
||||
if(FASTLZ_EXPECT_CONDITIONAL(ip < ip_limit))
|
||||
ctrl = *ip++;
|
||||
else
|
||||
loop = 0;
|
||||
|
||||
if(ref == op)
|
||||
{
|
||||
/* optimize copy for a run */
|
||||
flzuint8 b = ref[-1];
|
||||
*op++ = b;
|
||||
*op++ = b;
|
||||
*op++ = b;
|
||||
for(; len; --len)
|
||||
*op++ = b;
|
||||
}
|
||||
else
|
||||
{
|
||||
#if !defined(FASTLZ_STRICT_ALIGN)
|
||||
const flzuint16* p;
|
||||
flzuint16* q;
|
||||
#endif
|
||||
/* copy from reference */
|
||||
ref--;
|
||||
*op++ = *ref++;
|
||||
*op++ = *ref++;
|
||||
*op++ = *ref++;
|
||||
|
||||
#if !defined(FASTLZ_STRICT_ALIGN)
|
||||
/* copy a byte, so that now it's word aligned */
|
||||
if(len & 1)
|
||||
{
|
||||
*op++ = *ref++;
|
||||
len--;
|
||||
}
|
||||
|
||||
/* copy 16-bit at once */
|
||||
q = (flzuint16*) op;
|
||||
op += len;
|
||||
p = (const flzuint16*) ref;
|
||||
for(len>>=1; len > 4; len-=4)
|
||||
{
|
||||
*q++ = *p++;
|
||||
*q++ = *p++;
|
||||
*q++ = *p++;
|
||||
*q++ = *p++;
|
||||
}
|
||||
for(; len; --len)
|
||||
*q++ = *p++;
|
||||
#else
|
||||
for(; len; --len)
|
||||
*op++ = *ref++;
|
||||
#endif
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
ctrl++;
|
||||
#ifdef FASTLZ_SAFE
|
||||
if (FASTLZ_UNEXPECT_CONDITIONAL(op + ctrl > op_limit))
|
||||
return 0;
|
||||
if (FASTLZ_UNEXPECT_CONDITIONAL(ip + ctrl > ip_limit))
|
||||
return 0;
|
||||
#endif
|
||||
|
||||
*op++ = *ip++;
|
||||
for(--ctrl; ctrl; ctrl--)
|
||||
*op++ = *ip++;
|
||||
|
||||
loop = FASTLZ_EXPECT_CONDITIONAL(ip < ip_limit);
|
||||
if(loop)
|
||||
ctrl = *ip++;
|
||||
static void fastlz_memmove(uint8_t* dest, const uint8_t* src, uint32_t count) {
|
||||
if ((count > 4) && (dest >= src + count)) {
|
||||
memmove(dest, src, count);
|
||||
} else {
|
||||
switch (count) {
|
||||
default:
|
||||
do {
|
||||
*dest++ = *src++;
|
||||
} while (--count);
|
||||
break;
|
||||
case 3:
|
||||
*dest++ = *src++;
|
||||
case 2:
|
||||
*dest++ = *src++;
|
||||
case 1:
|
||||
*dest++ = *src++;
|
||||
case 0:
|
||||
break;
|
||||
}
|
||||
}
|
||||
while(FASTLZ_EXPECT_CONDITIONAL(loop));
|
||||
|
||||
return op - (flzuint8*)output;
|
||||
}
|
||||
|
||||
#endif /* !defined(FASTLZ_COMPRESSOR) && !defined(FASTLZ_DECOMPRESSOR) */
|
||||
static void fastlz_memcpy(uint8_t* dest, const uint8_t* src, uint32_t count) {
|
||||
memcpy(dest, src, count);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
int fastlz1_decompress(const void* input, int length, void* output,
|
||||
int maxout) {
|
||||
const uint8_t* ip = (const uint8_t*)input;
|
||||
const uint8_t* ip_limit = ip + length;
|
||||
const uint8_t* ip_bound = ip_limit - 2;
|
||||
uint8_t* op = (uint8_t*)output;
|
||||
uint8_t* op_limit = op + maxout;
|
||||
uint32_t ctrl = (*ip++) & 31;
|
||||
|
||||
while (1) {
|
||||
if (ctrl >= 32) {
|
||||
uint32_t len = (ctrl >> 5) - 1;
|
||||
uint32_t ofs = (ctrl & 31) << 8;
|
||||
const uint8_t* ref = op - ofs - 1;
|
||||
if (len == 7 - 1) {
|
||||
FASTLZ_BOUND_CHECK(ip <= ip_bound);
|
||||
len += *ip++;
|
||||
}
|
||||
ref -= *ip++;
|
||||
len += 3;
|
||||
FASTLZ_BOUND_CHECK(op + len <= op_limit);
|
||||
FASTLZ_BOUND_CHECK(ref >= (uint8_t*)output);
|
||||
fastlz_memmove(op, ref, len);
|
||||
op += len;
|
||||
} else {
|
||||
ctrl++;
|
||||
FASTLZ_BOUND_CHECK(op + ctrl <= op_limit);
|
||||
FASTLZ_BOUND_CHECK(ip + ctrl <= ip_limit);
|
||||
fastlz_memcpy(op, ip, ctrl);
|
||||
ip += ctrl;
|
||||
op += ctrl;
|
||||
}
|
||||
|
||||
if (FASTLZ_UNLIKELY(ip > ip_bound)) break;
|
||||
ctrl = *ip++;
|
||||
}
|
||||
|
||||
return op - (uint8_t*)output;
|
||||
}
|
||||
|
||||
int fastlz2_compress(const void* input, int length, void* output) {
|
||||
const uint8_t* ip = (const uint8_t*)input;
|
||||
const uint8_t* ip_bound = ip + length - 2;
|
||||
const uint8_t* ip_limit = ip + length - 12 - 1;
|
||||
uint8_t* op = (uint8_t*)output;
|
||||
|
||||
const uint8_t* htab[HASH_SIZE];
|
||||
uint32_t hval;
|
||||
|
||||
uint32_t copy;
|
||||
|
||||
/* sanity check */
|
||||
if (FASTLZ_UNLIKELY(length < 4)) {
|
||||
if (length) {
|
||||
/* create literal copy only */
|
||||
*op++ = length - 1;
|
||||
ip_bound++;
|
||||
while (ip <= ip_bound) *op++ = *ip++;
|
||||
return length + 1;
|
||||
} else
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* initializes hash table */
|
||||
for (hval = 0; hval < HASH_SIZE; ++hval) htab[hval] = ip;
|
||||
|
||||
/* we start with literal copy */
|
||||
copy = 2;
|
||||
*op++ = MAX_COPY - 1;
|
||||
*op++ = *ip++;
|
||||
*op++ = *ip++;
|
||||
|
||||
/* main loop */
|
||||
while (FASTLZ_LIKELY(ip < ip_limit)) {
|
||||
const uint8_t* ref;
|
||||
uint32_t distance;
|
||||
|
||||
/* minimum match length */
|
||||
uint32_t len = 3;
|
||||
|
||||
/* comparison starting-point */
|
||||
const uint8_t* anchor = ip;
|
||||
|
||||
/* check for a run */
|
||||
if (ip[0] == ip[-1] && ip[0] == ip[1] && ip[1] == ip[2]) {
|
||||
distance = 1;
|
||||
ip += 3;
|
||||
ref = anchor - 1 + 3;
|
||||
goto match;
|
||||
}
|
||||
|
||||
/* find potential match */
|
||||
HASH_FUNCTION(hval, ip);
|
||||
ref = htab[hval];
|
||||
|
||||
/* update hash table */
|
||||
htab[hval] = anchor;
|
||||
|
||||
/* calculate distance to the match */
|
||||
distance = anchor - ref;
|
||||
|
||||
/* is this a match? check the first 3 bytes */
|
||||
if (distance == 0 || (distance >= MAX_FARDISTANCE) || *ref++ != *ip++ ||
|
||||
*ref++ != *ip++ || *ref++ != *ip++)
|
||||
goto literal;
|
||||
|
||||
/* far, needs at least 5-byte match */
|
||||
if (distance >= MAX_L2_DISTANCE) {
|
||||
if (*ip++ != *ref++ || *ip++ != *ref++) goto literal;
|
||||
len += 2;
|
||||
}
|
||||
|
||||
match:
|
||||
|
||||
/* last matched byte */
|
||||
ip = anchor + len;
|
||||
|
||||
/* distance is biased */
|
||||
distance--;
|
||||
|
||||
if (!distance) {
|
||||
/* zero distance means a run */
|
||||
uint8_t x = ip[-1];
|
||||
while (ip < ip_bound)
|
||||
if (*ref++ != x)
|
||||
break;
|
||||
else
|
||||
ip++;
|
||||
} else
|
||||
for (;;) {
|
||||
/* safe because the outer check against ip limit */
|
||||
if (*ref++ != *ip++) break;
|
||||
if (*ref++ != *ip++) break;
|
||||
if (*ref++ != *ip++) break;
|
||||
if (*ref++ != *ip++) break;
|
||||
if (*ref++ != *ip++) break;
|
||||
if (*ref++ != *ip++) break;
|
||||
if (*ref++ != *ip++) break;
|
||||
if (*ref++ != *ip++) break;
|
||||
while (ip < ip_bound)
|
||||
if (*ref++ != *ip++) break;
|
||||
break;
|
||||
}
|
||||
|
||||
/* if we have copied something, adjust the copy count */
|
||||
if (copy) /* copy is biased, '0' means 1 byte copy */
|
||||
*(op - copy - 1) = copy - 1;
|
||||
else
|
||||
/* back, to overwrite the copy count */
|
||||
op--;
|
||||
|
||||
/* reset literal counter */
|
||||
copy = 0;
|
||||
|
||||
/* length is biased, '1' means a match of 3 bytes */
|
||||
ip -= 3;
|
||||
len = ip - anchor;
|
||||
|
||||
/* encode the match */
|
||||
if (distance < MAX_L2_DISTANCE) {
|
||||
if (len < 7) {
|
||||
*op++ = (len << 5) + (distance >> 8);
|
||||
*op++ = (distance & 255);
|
||||
} else {
|
||||
*op++ = (7 << 5) + (distance >> 8);
|
||||
for (len -= 7; len >= 255; len -= 255) *op++ = 255;
|
||||
*op++ = len;
|
||||
*op++ = (distance & 255);
|
||||
}
|
||||
} else {
|
||||
/* far away, but not yet in the another galaxy... */
|
||||
if (len < 7) {
|
||||
distance -= MAX_L2_DISTANCE;
|
||||
*op++ = (len << 5) + 31;
|
||||
*op++ = 255;
|
||||
*op++ = distance >> 8;
|
||||
*op++ = distance & 255;
|
||||
} else {
|
||||
distance -= MAX_L2_DISTANCE;
|
||||
*op++ = (7 << 5) + 31;
|
||||
for (len -= 7; len >= 255; len -= 255) *op++ = 255;
|
||||
*op++ = len;
|
||||
*op++ = 255;
|
||||
*op++ = distance >> 8;
|
||||
*op++ = distance & 255;
|
||||
}
|
||||
}
|
||||
|
||||
/* update the hash at match boundary */
|
||||
HASH_FUNCTION(hval, ip);
|
||||
htab[hval] = ip++;
|
||||
HASH_FUNCTION(hval, ip);
|
||||
htab[hval] = ip++;
|
||||
|
||||
/* assuming literal copy */
|
||||
*op++ = MAX_COPY - 1;
|
||||
|
||||
continue;
|
||||
|
||||
literal:
|
||||
*op++ = *anchor++;
|
||||
ip = anchor;
|
||||
copy++;
|
||||
if (FASTLZ_UNLIKELY(copy == MAX_COPY)) {
|
||||
copy = 0;
|
||||
*op++ = MAX_COPY - 1;
|
||||
}
|
||||
}
|
||||
|
||||
/* left-over as literal copy */
|
||||
ip_bound++;
|
||||
while (ip <= ip_bound) {
|
||||
*op++ = *ip++;
|
||||
copy++;
|
||||
if (copy == MAX_COPY) {
|
||||
copy = 0;
|
||||
*op++ = MAX_COPY - 1;
|
||||
}
|
||||
}
|
||||
|
||||
/* if we have copied something, adjust the copy length */
|
||||
if (copy)
|
||||
*(op - copy - 1) = copy - 1;
|
||||
else
|
||||
op--;
|
||||
|
||||
/* marker for fastlz2 */
|
||||
*(uint8_t*)output |= (1 << 5);
|
||||
|
||||
return op - (uint8_t*)output;
|
||||
}
|
||||
|
||||
int fastlz2_decompress(const void* input, int length, void* output,
|
||||
int maxout) {
|
||||
const uint8_t* ip = (const uint8_t*)input;
|
||||
const uint8_t* ip_limit = ip + length;
|
||||
const uint8_t* ip_bound = ip_limit - 2;
|
||||
uint8_t* op = (uint8_t*)output;
|
||||
uint8_t* op_limit = op + maxout;
|
||||
uint32_t ctrl = (*ip++) & 31;
|
||||
|
||||
while (1) {
|
||||
if (ctrl >= 32) {
|
||||
uint32_t len = (ctrl >> 5) - 1;
|
||||
uint32_t ofs = (ctrl & 31) << 8;
|
||||
const uint8_t* ref = op - ofs - 1;
|
||||
|
||||
uint8_t code;
|
||||
if (len == 7 - 1) do {
|
||||
FASTLZ_BOUND_CHECK(ip <= ip_bound);
|
||||
code = *ip++;
|
||||
len += code;
|
||||
} while (code == 255);
|
||||
code = *ip++;
|
||||
ref -= code;
|
||||
len += 3;
|
||||
|
||||
/* match from 16-bit distance */
|
||||
if (FASTLZ_UNLIKELY(code == 255))
|
||||
if (FASTLZ_LIKELY(ofs == (31 << 8))) {
|
||||
FASTLZ_BOUND_CHECK(ip < ip_bound);
|
||||
ofs = (*ip++) << 8;
|
||||
ofs += *ip++;
|
||||
ref = op - ofs - MAX_L2_DISTANCE - 1;
|
||||
}
|
||||
|
||||
FASTLZ_BOUND_CHECK(op + len <= op_limit);
|
||||
FASTLZ_BOUND_CHECK(ref >= (uint8_t*)output);
|
||||
fastlz_memmove(op, ref, len);
|
||||
op += len;
|
||||
} else {
|
||||
ctrl++;
|
||||
FASTLZ_BOUND_CHECK(op + ctrl <= op_limit);
|
||||
FASTLZ_BOUND_CHECK(ip + ctrl <= ip_limit);
|
||||
fastlz_memcpy(op, ip, ctrl);
|
||||
ip += ctrl;
|
||||
op += ctrl;
|
||||
}
|
||||
|
||||
if (FASTLZ_UNLIKELY(ip >= ip_limit)) break;
|
||||
ctrl = *ip++;
|
||||
}
|
||||
|
||||
return op - (uint8_t*)output;
|
||||
}
|
||||
|
||||
int fastlz_compress(const void* input, int length, void* output) {
|
||||
/* for short block, choose fastlz1 */
|
||||
if (length < 65536) return fastlz1_compress(input, length, output);
|
||||
|
||||
/* else... */
|
||||
return fastlz2_compress(input, length, output);
|
||||
}
|
||||
|
||||
int fastlz_decompress(const void* input, int length, void* output, int maxout) {
|
||||
/* magic identifier for compression level */
|
||||
int level = ((*(const uint8_t*)input) >> 5) + 1;
|
||||
|
||||
if (level == 1) return fastlz1_decompress(input, length, output, maxout);
|
||||
if (level == 2) return fastlz2_decompress(input, length, output, maxout);
|
||||
|
||||
/* unknown level, trigger error */
|
||||
return 0;
|
||||
}
|
||||
|
||||
int fastlz_compress_level(int level, const void* input, int length,
|
||||
void* output) {
|
||||
if (level == 1) return fastlz1_compress(input, length, output);
|
||||
if (level == 2) return fastlz2_compress(input, length, output);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,9 +1,6 @@
|
|||
/*
|
||||
FastLZ - lightning-fast lossless compression library
|
||||
|
||||
Copyright (C) 2007 Ariya Hidayat (ariya@kde.org)
|
||||
Copyright (C) 2006 Ariya Hidayat (ariya@kde.org)
|
||||
Copyright (C) 2005 Ariya Hidayat (ariya@kde.org)
|
||||
FastLZ - Byte-aligned LZ77 compression library
|
||||
Copyright (C) 2005-2020 Ariya Hidayat <ariya.hidayat@gmail.com>
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
of this software and associated documentation files (the "Software"), to deal
|
||||
|
|
@ -27,48 +24,18 @@
|
|||
#ifndef FASTLZ_H
|
||||
#define FASTLZ_H
|
||||
|
||||
#define FASTLZ_VERSION 0x000100
|
||||
#define FASTLZ_VERSION 0x000500
|
||||
|
||||
#define FASTLZ_VERSION_MAJOR 0
|
||||
#define FASTLZ_VERSION_MINOR 0
|
||||
#define FASTLZ_VERSION_REVISION 0
|
||||
#define FASTLZ_VERSION_MAJOR 0
|
||||
#define FASTLZ_VERSION_MINOR 5
|
||||
#define FASTLZ_VERSION_REVISION 0
|
||||
|
||||
#define FASTLZ_VERSION_STRING "0.1.0"
|
||||
#define FASTLZ_VERSION_STRING "0.5.0"
|
||||
|
||||
#if defined (__cplusplus)
|
||||
#if defined(__cplusplus)
|
||||
extern "C" {
|
||||
#endif
|
||||
|
||||
/**
|
||||
Compress a block of data in the input buffer and returns the size of
|
||||
compressed block. The size of input buffer is specified by length. The
|
||||
minimum input buffer size is 16.
|
||||
|
||||
The output buffer must be at least 5% larger than the input buffer
|
||||
and can not be smaller than 66 bytes.
|
||||
|
||||
If the input is not compressible, the return value might be larger than
|
||||
length (input buffer size).
|
||||
|
||||
The input buffer and the output buffer can not overlap.
|
||||
*/
|
||||
|
||||
int fastlz_compress(const void* input, int length, void* output);
|
||||
|
||||
/**
|
||||
Decompress a block of compressed data and returns the size of the
|
||||
decompressed block. If error occurs, e.g. the compressed data is
|
||||
corrupted or the output buffer is not large enough, then 0 (zero)
|
||||
will be returned instead.
|
||||
|
||||
The input buffer and the output buffer can not overlap.
|
||||
|
||||
Decompression is memory safe and guaranteed not to write the output buffer
|
||||
more than what is specified in maxout.
|
||||
*/
|
||||
|
||||
int fastlz_decompress(const void* input, int length, void* output, int maxout);
|
||||
|
||||
/**
|
||||
Compress a block of data in the input buffer and returns the size of
|
||||
compressed block. The size of input buffer is specified by length. The
|
||||
|
|
@ -88,12 +55,43 @@ int fastlz_decompress(const void* input, int length, void* output, int maxout);
|
|||
Level 2 is slightly slower but it gives better compression ratio.
|
||||
|
||||
Note that the compressed data, regardless of the level, can always be
|
||||
decompressed using the function fastlz_decompress above.
|
||||
decompressed using the function fastlz_decompress below.
|
||||
*/
|
||||
|
||||
int fastlz_compress_level(int level, const void* input, int length, void* output);
|
||||
int fastlz_compress_level(int level, const void* input, int length,
|
||||
void* output);
|
||||
|
||||
#if defined (__cplusplus)
|
||||
/**
|
||||
Decompress a block of compressed data and returns the size of the
|
||||
decompressed block. If error occurs, e.g. the compressed data is
|
||||
corrupted or the output buffer is not large enough, then 0 (zero)
|
||||
will be returned instead.
|
||||
|
||||
The input buffer and the output buffer can not overlap.
|
||||
|
||||
Decompression is memory safe and guaranteed not to write the output buffer
|
||||
more than what is specified in maxout.
|
||||
|
||||
Note that the decompression will always work, regardless of the
|
||||
compression level specified in fastlz_compress_level above (when
|
||||
producing the compressed block).
|
||||
*/
|
||||
|
||||
int fastlz_decompress(const void* input, int length, void* output, int maxout);
|
||||
|
||||
/**
|
||||
DEPRECATED.
|
||||
|
||||
This is similar to fastlz_compress_level above, but with the level
|
||||
automatically chosen.
|
||||
|
||||
This function is deprecated and it will be completely removed in some future
|
||||
version.
|
||||
*/
|
||||
|
||||
int fastlz_compress(const void* input, int length, void* output);
|
||||
|
||||
#if defined(__cplusplus)
|
||||
}
|
||||
#endif
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue