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| 1 /* Lzma86Enc.c -- LZMA + x86 (BCJ) Filter Encoder | |
| 2 2008-08-05 | |
| 3 Igor Pavlov | |
| 4 Public domain */ | |
| 5 | |
| 6 #include <string.h> | |
| 7 | |
| 8 #include "Lzma86Enc.h" | |
| 9 | |
| 10 #include "../Alloc.h" | |
| 11 #include "../Bra.h" | |
| 12 #include "../LzmaEnc.h" | |
| 13 | |
| 14 #define SZE_OUT_OVERFLOW SZE_DATA_ERROR | |
| 15 | |
| 16 static void *SzAlloc(void *p, size_t size) { p = p; return MyAlloc(size); } | |
| 17 static void SzFree(void *p, void *address) { p = p; MyFree(address); } | |
| 18 static ISzAlloc g_Alloc = { SzAlloc, SzFree }; | |
| 19 | |
| 20 #define LZMA86_SIZE_OFFSET (1 + LZMA_PROPS_SIZE) | |
| 21 #define LZMA86_HEADER_SIZE (LZMA86_SIZE_OFFSET + 8) | |
| 22 | |
| 23 int Lzma86_Encode(Byte *dest, size_t *destLen, const Byte *src, size_t srcLen, | |
| 24 int level, UInt32 dictSize, int filterMode) | |
| 25 { | |
| 26 size_t outSize2 = *destLen; | |
| 27 Byte *filteredStream; | |
| 28 Bool useFilter; | |
| 29 int mainResult = SZ_ERROR_OUTPUT_EOF; | |
| 30 CLzmaEncProps props; | |
| 31 LzmaEncProps_Init(&props); | |
| 32 props.level = level; | |
| 33 props.dictSize = dictSize; | |
| 34 | |
| 35 *destLen = 0; | |
| 36 if (outSize2 < LZMA86_HEADER_SIZE) | |
| 37 return SZ_ERROR_OUTPUT_EOF; | |
| 38 | |
| 39 { | |
| 40 int i; | |
| 41 UInt64 t = srcLen; | |
| 42 for (i = 0; i < 8; i++, t >>= 8) | |
| 43 dest[LZMA86_SIZE_OFFSET + i] = (Byte)t; | |
| 44 } | |
| 45 | |
| 46 filteredStream = 0; | |
| 47 useFilter = (filterMode != SZ_FILTER_NO); | |
| 48 if (useFilter) | |
| 49 { | |
| 50 if (srcLen != 0) | |
| 51 { | |
| 52 filteredStream = (Byte *)MyAlloc(srcLen); | |
| 53 if (filteredStream == 0) | |
| 54 return SZ_ERROR_MEM; | |
| 55 memcpy(filteredStream, src, srcLen); | |
| 56 } | |
| 57 { | |
| 58 UInt32 x86State; | |
| 59 x86_Convert_Init(x86State); | |
| 60 x86_Convert(filteredStream, srcLen, 0, &x86State, 1); | |
| 61 } | |
| 62 } | |
| 63 | |
| 64 { | |
| 65 size_t minSize = 0; | |
| 66 Bool bestIsFiltered = False; | |
| 67 | |
| 68 /* passes for SZ_FILTER_AUTO: | |
| 69 0 - BCJ + LZMA | |
| 70 1 - LZMA | |
| 71 2 - BCJ + LZMA agaian, if pass 0 (BCJ + LZMA) is better. | |
| 72 */ | |
| 73 int numPasses = (filterMode == SZ_FILTER_AUTO) ? 3 : 1; | |
| 74 | |
| 75 int i; | |
| 76 for (i = 0; i < numPasses; i++) | |
| 77 { | |
| 78 size_t outSizeProcessed = outSize2 - LZMA86_HEADER_SIZE; | |
| 79 size_t outPropsSize = 5; | |
| 80 SRes curRes; | |
| 81 Bool curModeIsFiltered = (numPasses > 1 && i == numPasses - 1); | |
| 82 if (curModeIsFiltered && !bestIsFiltered) | |
| 83 break; | |
| 84 if (useFilter && i == 0) | |
| 85 curModeIsFiltered = True; | |
| 86 | |
| 87 curRes = LzmaEncode(dest + LZMA86_HEADER_SIZE, &outSizeProcessed, | |
| 88 curModeIsFiltered ? filteredStream : src, srcLen, | |
| 89 &props, dest + 1, &outPropsSize, 0, | |
| 90 NULL, &g_Alloc, &g_Alloc); | |
| 91 | |
| 92 if (curRes != SZ_ERROR_OUTPUT_EOF) | |
| 93 { | |
| 94 if (curRes != SZ_OK) | |
| 95 { | |
| 96 mainResult = curRes; | |
| 97 break; | |
| 98 } | |
| 99 if (outSizeProcessed <= minSize || mainResult != SZ_OK) | |
| 100 { | |
| 101 minSize = outSizeProcessed; | |
| 102 bestIsFiltered = curModeIsFiltered; | |
| 103 mainResult = SZ_OK; | |
| 104 } | |
| 105 } | |
| 106 } | |
| 107 dest[0] = (bestIsFiltered ? 1 : 0); | |
| 108 *destLen = LZMA86_HEADER_SIZE + minSize; | |
| 109 } | |
| 110 if (useFilter) | |
| 111 MyFree(filteredStream); | |
| 112 return mainResult; | |
| 113 } | |
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Chromium Code Reviews
Issue 624713003:
Keep only base/extractor.[cc|h]. (Closed)
Base URL: https://chromium.googlesource.com/external/omaha.git@master