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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 99 | pmbaty | 1 | /* Lzma86Enc.c -- LZMA + x86 (BCJ) Filter Encoder |
| 2 | 2008-08-05 |
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| 3 | Igor Pavlov |
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| 4 | Public domain */ |
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| 5 | |||
| 6 | #include <string.h> |
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| 7 | |||
| 8 | #include "Lzma86Enc.h" |
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| 9 | |||
| 10 | #include "Alloc.h" |
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| 11 | #include "Bra.h" |
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| 12 | #include "LzmaEnc.h" |
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| 13 | |||
| 14 | #define SZE_OUT_OVERFLOW SZE_DATA_ERROR |
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| 15 | |||
| 16 | static void *SzAlloc(void *p, size_t size) { return MyAlloc(size); } |
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| 17 | static void SzFree(void *p, void *address) { MyFree(address); } |
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| 18 | static ISzAlloc g_Alloc = { SzAlloc, SzFree }; |
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| 19 | |||
| 20 | #define LZMA86_SIZE_OFFSET (1 + LZMA_PROPS_SIZE) |
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| 21 | #define LZMA86_HEADER_SIZE (LZMA86_SIZE_OFFSET + 8) |
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| 22 | |||
| 23 | int Lzma86_Encode(Byte *dest, size_t *destLen, const Byte *src, size_t srcLen, |
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| 24 | int level, UInt32 dictSize, int filterMode) |
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| 25 | { |
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| 26 | size_t outSize2 = *destLen; |
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| 27 | Byte *filteredStream; |
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| 28 | Bool useFilter; |
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| 29 | int mainResult = SZ_ERROR_OUTPUT_EOF; |
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| 30 | CLzmaEncProps props; |
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| 31 | LzmaEncProps_Init(&props); |
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| 32 | props.level = level; |
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| 33 | props.dictSize = dictSize; |
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| 34 | |||
| 35 | *destLen = 0; |
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| 36 | if (outSize2 < LZMA86_HEADER_SIZE) |
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| 37 | return SZ_ERROR_OUTPUT_EOF; |
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| 38 | |||
| 39 | { |
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| 40 | int i; |
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| 41 | UInt64 t = srcLen; |
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| 42 | for (i = 0; i < 8; i++, t >>= 8) |
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| 43 | dest[LZMA86_SIZE_OFFSET + i] = (Byte)t; |
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| 44 | } |
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| 45 | |||
| 46 | filteredStream = 0; |
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| 47 | useFilter = (filterMode != SZ_FILTER_NO); |
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| 48 | if (useFilter) |
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| 49 | { |
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| 50 | if (srcLen != 0) |
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| 51 | { |
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| 52 | filteredStream = (Byte *)MyAlloc(srcLen); |
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| 53 | if (filteredStream == 0) |
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| 54 | return SZ_ERROR_MEM; |
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| 55 | memcpy(filteredStream, src, srcLen); |
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| 56 | } |
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| 57 | { |
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| 58 | UInt32 x86State; |
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| 59 | x86_Convert_Init(x86State); |
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| 60 | x86_Convert(filteredStream, srcLen, 0, &x86State, 1); |
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| 61 | } |
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| 62 | } |
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| 63 | |||
| 64 | { |
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| 65 | size_t minSize = 0; |
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| 66 | Bool bestIsFiltered = False; |
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| 67 | |||
| 68 | /* passes for SZ_FILTER_AUTO: |
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| 69 | |||
| 70 | 1 - LZMA |
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| 71 | 2 - BCJ + LZMA agaian, if pass 0 (BCJ + LZMA) is better. |
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| 72 | */ |
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| 73 | int numPasses = (filterMode == SZ_FILTER_AUTO) ? 3 : 1; |
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| 74 | |||
| 75 | int i; |
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| 76 | for (i = 0; i < numPasses; i++) |
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| 77 | { |
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| 78 | size_t outSizeProcessed = outSize2 - LZMA86_HEADER_SIZE; |
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| 79 | size_t outPropsSize = 5; |
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| 80 | SRes curRes; |
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| 81 | Bool curModeIsFiltered = (numPasses > 1 && i == numPasses - 1); |
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| 82 | if (curModeIsFiltered && !bestIsFiltered) |
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| 83 | break; |
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| 84 | if (useFilter && i == 0) |
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| 85 | curModeIsFiltered = True; |
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| 86 | |||
| 87 | curRes = LzmaEncode(dest + LZMA86_HEADER_SIZE, &outSizeProcessed, |
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| 88 | curModeIsFiltered ? filteredStream : src, srcLen, |
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| 89 | &props, dest + 1, &outPropsSize, 0, |
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| 90 | NULL, &g_Alloc, &g_Alloc); |
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| 91 | |||
| 92 | if (curRes != SZ_ERROR_OUTPUT_EOF) |
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| 93 | { |
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| 94 | if (curRes != SZ_OK) |
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| 95 | { |
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| 96 | mainResult = curRes; |
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| 97 | break; |
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| 98 | } |
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| 99 | if (outSizeProcessed <= minSize || mainResult != SZ_OK) |
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| 100 | { |
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| 101 | minSize = outSizeProcessed; |
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| 102 | bestIsFiltered = curModeIsFiltered; |
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| 103 | mainResult = SZ_OK; |
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| 104 | } |
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| 105 | } |
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| 106 | } |
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| 107 | dest[0] = (unsigned char) (bestIsFiltered ? 1 : 0); /*MAB: Cast to silence compiler */ |
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| 108 | *destLen = LZMA86_HEADER_SIZE + minSize; |
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| 109 | } |
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| 110 | if (useFilter) |
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| 111 | MyFree(filteredStream); |
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| 112 | return mainResult; |
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| 113 | } |