| 1 | /* Lzma86Enc.c -- LZMA + x86 (BCJ) Filter Encoder\r |
| 2 | 2016-05-16 : Igor Pavlov : Public domain */\r |
| 3 | \r |
| 4 | #include "Precomp.h"\r |
| 5 | \r |
| 6 | #include <string.h>\r |
| 7 | \r |
| 8 | #include "Lzma86.h"\r |
| 9 | \r |
| 10 | #include "Alloc.h"\r |
| 11 | #include "Bra.h"\r |
| 12 | #include "LzmaEnc.h"\r |
| 13 | \r |
| 14 | #define SZE_OUT_OVERFLOW SZE_DATA_ERROR\r |
| 15 | \r |
| 16 | int Lzma86_Encode(Byte *dest, size_t *destLen, const Byte *src, size_t srcLen,\r |
| 17 | int level, UInt32 dictSize, int filterMode)\r |
| 18 | {\r |
| 19 | size_t outSize2 = *destLen;\r |
| 20 | Byte *filteredStream;\r |
| 21 | Bool useFilter;\r |
| 22 | int mainResult = SZ_ERROR_OUTPUT_EOF;\r |
| 23 | CLzmaEncProps props;\r |
| 24 | LzmaEncProps_Init(&props);\r |
| 25 | props.level = level;\r |
| 26 | props.dictSize = dictSize;\r |
| 27 | \r |
| 28 | *destLen = 0;\r |
| 29 | if (outSize2 < LZMA86_HEADER_SIZE)\r |
| 30 | return SZ_ERROR_OUTPUT_EOF;\r |
| 31 | \r |
| 32 | {\r |
| 33 | int i;\r |
| 34 | UInt64 t = srcLen;\r |
| 35 | for (i = 0; i < 8; i++, t >>= 8)\r |
| 36 | dest[LZMA86_SIZE_OFFSET + i] = (Byte)t;\r |
| 37 | }\r |
| 38 | \r |
| 39 | filteredStream = 0;\r |
| 40 | useFilter = (filterMode != SZ_FILTER_NO);\r |
| 41 | if (useFilter)\r |
| 42 | {\r |
| 43 | if (srcLen != 0)\r |
| 44 | {\r |
| 45 | filteredStream = (Byte *)MyAlloc(srcLen);\r |
| 46 | if (filteredStream == 0)\r |
| 47 | return SZ_ERROR_MEM;\r |
| 48 | memcpy(filteredStream, src, srcLen);\r |
| 49 | }\r |
| 50 | {\r |
| 51 | UInt32 x86State;\r |
| 52 | x86_Convert_Init(x86State);\r |
| 53 | x86_Convert(filteredStream, srcLen, 0, &x86State, 1);\r |
| 54 | }\r |
| 55 | }\r |
| 56 | \r |
| 57 | {\r |
| 58 | size_t minSize = 0;\r |
| 59 | Bool bestIsFiltered = False;\r |
| 60 | \r |
| 61 | /* passes for SZ_FILTER_AUTO:\r |
| 62 | 0 - BCJ + LZMA\r |
| 63 | 1 - LZMA\r |
| 64 | 2 - BCJ + LZMA agaian, if pass 0 (BCJ + LZMA) is better.\r |
| 65 | */\r |
| 66 | int numPasses = (filterMode == SZ_FILTER_AUTO) ? 3 : 1;\r |
| 67 | \r |
| 68 | int i;\r |
| 69 | for (i = 0; i < numPasses; i++)\r |
| 70 | {\r |
| 71 | size_t outSizeProcessed = outSize2 - LZMA86_HEADER_SIZE;\r |
| 72 | size_t outPropsSize = 5;\r |
| 73 | SRes curRes;\r |
| 74 | Bool curModeIsFiltered = (numPasses > 1 && i == numPasses - 1);\r |
| 75 | if (curModeIsFiltered && !bestIsFiltered)\r |
| 76 | break;\r |
| 77 | if (useFilter && i == 0)\r |
| 78 | curModeIsFiltered = True;\r |
| 79 | \r |
| 80 | curRes = LzmaEncode(dest + LZMA86_HEADER_SIZE, &outSizeProcessed,\r |
| 81 | curModeIsFiltered ? filteredStream : src, srcLen,\r |
| 82 | &props, dest + 1, &outPropsSize, 0,\r |
| 83 | NULL, &g_Alloc, &g_Alloc);\r |
| 84 | \r |
| 85 | if (curRes != SZ_ERROR_OUTPUT_EOF)\r |
| 86 | {\r |
| 87 | if (curRes != SZ_OK)\r |
| 88 | {\r |
| 89 | mainResult = curRes;\r |
| 90 | break;\r |
| 91 | }\r |
| 92 | if (outSizeProcessed <= minSize || mainResult != SZ_OK)\r |
| 93 | {\r |
| 94 | minSize = outSizeProcessed;\r |
| 95 | bestIsFiltered = curModeIsFiltered;\r |
| 96 | mainResult = SZ_OK;\r |
| 97 | }\r |
| 98 | }\r |
| 99 | }\r |
| 100 | dest[0] = (Byte)(bestIsFiltered ? 1 : 0);\r |
| 101 | *destLen = LZMA86_HEADER_SIZE + minSize;\r |
| 102 | }\r |
| 103 | if (useFilter)\r |
| 104 | MyFree(filteredStream);\r |
| 105 | return mainResult;\r |
| 106 | }\r |