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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,200 @@ | ||
| /* | ||
| * LZ4 - Fast LZ compression algorithm | ||
| * Header File | ||
| * Copyright (C) 2011-2015, Yann Collet. | ||
| * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php) | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions are | ||
| * met: | ||
| * | ||
| * * Redistributions of source code must retain the above copyright | ||
| * notice, this list of conditions and the following disclaimer. | ||
| * * Redistributions in binary form must reproduce the above | ||
| * copyright notice, this list of conditions and the following disclaimer | ||
| * in the documentation and/or other materials provided with the | ||
| * distribution. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| * | ||
| * You can contact the author at : | ||
| * - LZ4 source repository : https://github.com/Cyan4973/lz4 | ||
| * - LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c | ||
| */ | ||
|
|
||
| #ifndef _SYS_LZ4_IMPL_H | ||
| #define _SYS_LZ4_IMPL_H | ||
|
|
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| #include <sys/zfs_context.h> | ||
|
|
||
| #ifdef __cplusplus | ||
| extern "C" { | ||
| #endif | ||
|
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| /* CPU Feature Detection */ | ||
| /* | ||
| * LZ4_FORCE_SW_BITCOUNT | ||
| * Define this parameter if your target system or compiler does not support | ||
| * hardware bit count | ||
| * | ||
| * Illumos : we can't use GCC's __builtin_ctz family of builtins in the | ||
| * kernel | ||
| * Linux : we can use GCC's __builtin_ctz family of builtins in the | ||
| * kernel | ||
| */ | ||
| #undef LZ4_FORCE_SW_BITCOUNT | ||
| #if defined(__sparc) | ||
| #define LZ4_FORCE_SW_BITCOUNT | ||
| #endif | ||
|
|
||
| /* Compiler Options */ | ||
| #define LZ4_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) | ||
|
|
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| #if (LZ4_GCC_VERSION >= 302) || (__INTEL_COMPILER >= 800) || defined(__clang__) | ||
| #define expect(expr, value) (__builtin_expect((expr), (value))) | ||
| #else | ||
| #define expect(expr, value) (expr) | ||
| #endif | ||
|
|
||
| #ifndef likely | ||
| #define likely(expr) expect((expr) != 0, 1) | ||
| #endif | ||
| #ifndef unlikely | ||
| #define unlikely(expr) expect((expr) != 0, 0) | ||
| #endif | ||
|
|
||
| /* Basic Types */ | ||
| typedef uint8_t BYTE; | ||
| typedef uint16_t U16; | ||
| typedef uint32_t U32; | ||
| typedef int32_t S32; | ||
| typedef uint64_t U64; | ||
|
|
||
| /* Common Constants */ | ||
| #define MINMATCH 4 | ||
|
|
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| #define COPYLENGTH 8 | ||
| #define LASTLITERALS 5 | ||
| #define MFLIMIT (COPYLENGTH+MINMATCH) | ||
|
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| #define MAXD_LOG 16 | ||
| #define MAX_DISTANCE ((1 << MAXD_LOG) - 1) | ||
|
|
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| #define ML_BITS 4 | ||
| #define ML_MASK ((1U<<ML_BITS)-1) | ||
| #define RUN_BITS (8-ML_BITS) | ||
| #define RUN_MASK ((1U<<RUN_BITS)-1) | ||
|
|
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| /* Reading and writing into memory */ | ||
| #define STEPSIZE sizeof (size_t) | ||
|
|
||
| static unsigned | ||
| LZ4_64bits(void) | ||
| { | ||
| return (sizeof (void *) == 8); | ||
| } | ||
|
|
||
| static unsigned | ||
| LZ4_isLittleEndian(void) | ||
| { | ||
| /* don't use static : performance detrimental */ | ||
| const union { | ||
| U32 i; | ||
| BYTE c[4]; | ||
| } one = { 1 }; | ||
|
|
||
| return (one.c[0]); | ||
| } | ||
|
|
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| /* Common functions */ | ||
| static unsigned LZ4_NbCommonBytes(register size_t val) | ||
| { | ||
| if (LZ4_isLittleEndian()) { | ||
| if (LZ4_64bits()) { | ||
| #if (defined(__clang__) || (LZ4_GCC_VERSION >= 304)) && \ | ||
| !defined(LZ4_FORCE_SW_BITCOUNT) | ||
| return (__builtin_ctzll((U64)val) >> 3); | ||
| #else | ||
| static const int DeBruijnBytePos[64] = | ||
| { 0, 0, 0, 0, 0, 1, 1, 2, 0, 3, 1, 3, 1, 4, 2, 7, | ||
| 0, 2, 3, 6, 1, 5, 3, 5, 1, 3, 4, 4, 2, 5, 6, 7, | ||
| 7, 0, 1, 2, 3, 3, 4, 6, 2, 6, 5, 5, 3, 4, 5, 6, | ||
| 7, 1, 2, 4, 6, 4, 4, 5, 7, 2, 6, 5, 7, 6, 7, 7 | ||
| }; | ||
| return (DeBruijnBytePos[ | ||
| ((U64)((val & -(long long)val) * | ||
| 0x0218A392CDABBD3FULL)) >> 58]); | ||
| #endif | ||
| } else { /* 32 bits */ | ||
|
|
||
| #if (defined(__clang__) || (LZ4_GCC_VERSION >= 304)) && \ | ||
| !defined(LZ4_FORCE_SW_BITCOUNT) | ||
| return (__builtin_ctz((U32)val) >> 3); | ||
| #else | ||
| static const int DeBruijnBytePos[32] = | ||
| { 0, 0, 3, 0, 3, 1, 3, 0, 3, 2, 2, 1, 3, 2, 0, 1, | ||
| 3, 3, 1, 2, 2, 2, 2, 0, 3, 1, 2, 0, 1, 0, 1, 1 | ||
| }; | ||
| return (DeBruijnBytePos[((U32)((val & -(S32)val) * | ||
| 0x077CB531U)) >> 27]); | ||
| #endif | ||
| } | ||
| } else { /* Big Endian CPU */ | ||
|
|
||
| if (LZ4_64bits()) { | ||
| #if (defined(__clang__) || (LZ4_GCC_VERSION >= 304)) && \ | ||
| !defined(LZ4_FORCE_SW_BITCOUNT) | ||
| return (__builtin_clzll((U64)val) >> 3); | ||
| #else | ||
| unsigned r; | ||
| if (!(val >> 32)) { | ||
| r = 4; | ||
| } else { | ||
| r = 0; | ||
| val >>= 32; | ||
| } | ||
| if (!(val >> 16)) { | ||
| r += 2; | ||
| val >>= 8; | ||
| } else { | ||
| val >>= 24; | ||
| } | ||
| r += (!val); | ||
| return (r); | ||
| #endif | ||
| } else { /* 32 bits */ | ||
|
|
||
| #if (defined(__clang__) || (LZ4_GCC_VERSION >= 304)) && \ | ||
| !defined(LZ4_FORCE_SW_BITCOUNT) | ||
| return (__builtin_clz((U32)val) >> 3); | ||
| #else | ||
| unsigned r; | ||
| if (!(val >> 16)) { | ||
| r = 2; | ||
| val >>= 8; | ||
| } else { | ||
| r = 0; | ||
| val >>= 24; | ||
| } | ||
| r += (!val); | ||
| return (r); | ||
| #endif | ||
| } | ||
| } | ||
| } | ||
|
|
||
| #ifdef __cplusplus | ||
| } | ||
| #endif | ||
|
|
||
| #endif /* _SYS_LZ4_IMPL_H */ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
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@@ -61,6 +61,7 @@ KERNEL_C = \ | |
| gzip.c \ | ||
| lzjb.c \ | ||
| lz4.c \ | ||
| lz4hc.c \ | ||
| metaslab.c \ | ||
| multilist.c \ | ||
| range_tree.c \ | ||
|
|
||
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