9e052883 |
1 | /* Lzma86Enc.c -- LZMA + x86 (BCJ) Filter Encoder\r |
2 | 2018-07-04 : 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 | int Lzma86_Encode(Byte *dest, size_t *destLen, const Byte *src, size_t srcLen,\r |
15 | int level, UInt32 dictSize, int filterMode)\r |
16 | {\r |
17 | size_t outSize2 = *destLen;\r |
18 | Byte *filteredStream;\r |
19 | BoolInt useFilter;\r |
20 | int mainResult = SZ_ERROR_OUTPUT_EOF;\r |
21 | CLzmaEncProps props;\r |
22 | LzmaEncProps_Init(&props);\r |
23 | props.level = level;\r |
24 | props.dictSize = dictSize;\r |
25 | \r |
26 | *destLen = 0;\r |
27 | if (outSize2 < LZMA86_HEADER_SIZE)\r |
28 | return SZ_ERROR_OUTPUT_EOF;\r |
29 | \r |
30 | {\r |
31 | int i;\r |
32 | UInt64 t = srcLen;\r |
33 | for (i = 0; i < 8; i++, t >>= 8)\r |
34 | dest[LZMA86_SIZE_OFFSET + i] = (Byte)t;\r |
35 | }\r |
36 | \r |
37 | filteredStream = 0;\r |
38 | useFilter = (filterMode != SZ_FILTER_NO);\r |
39 | if (useFilter)\r |
40 | {\r |
41 | if (srcLen != 0)\r |
42 | {\r |
43 | filteredStream = (Byte *)MyAlloc(srcLen);\r |
44 | if (filteredStream == 0)\r |
45 | return SZ_ERROR_MEM;\r |
46 | memcpy(filteredStream, src, srcLen);\r |
47 | }\r |
48 | {\r |
49 | UInt32 x86State;\r |
50 | x86_Convert_Init(x86State);\r |
51 | x86_Convert(filteredStream, srcLen, 0, &x86State, 1);\r |
52 | }\r |
53 | }\r |
54 | \r |
55 | {\r |
56 | size_t minSize = 0;\r |
57 | BoolInt bestIsFiltered = False;\r |
58 | \r |
59 | /* passes for SZ_FILTER_AUTO:\r |
60 | 0 - BCJ + LZMA\r |
61 | 1 - LZMA\r |
62 | 2 - BCJ + LZMA agaian, if pass 0 (BCJ + LZMA) is better.\r |
63 | */\r |
64 | int numPasses = (filterMode == SZ_FILTER_AUTO) ? 3 : 1;\r |
65 | \r |
66 | int i;\r |
67 | for (i = 0; i < numPasses; i++)\r |
68 | {\r |
69 | size_t outSizeProcessed = outSize2 - LZMA86_HEADER_SIZE;\r |
70 | size_t outPropsSize = 5;\r |
71 | SRes curRes;\r |
72 | BoolInt curModeIsFiltered = (numPasses > 1 && i == numPasses - 1);\r |
73 | if (curModeIsFiltered && !bestIsFiltered)\r |
74 | break;\r |
75 | if (useFilter && i == 0)\r |
76 | curModeIsFiltered = True;\r |
77 | \r |
78 | curRes = LzmaEncode(dest + LZMA86_HEADER_SIZE, &outSizeProcessed,\r |
79 | curModeIsFiltered ? filteredStream : src, srcLen,\r |
80 | &props, dest + 1, &outPropsSize, 0,\r |
81 | NULL, &g_Alloc, &g_Alloc);\r |
82 | \r |
83 | if (curRes != SZ_ERROR_OUTPUT_EOF)\r |
84 | {\r |
85 | if (curRes != SZ_OK)\r |
86 | {\r |
87 | mainResult = curRes;\r |
88 | break;\r |
89 | }\r |
90 | if (outSizeProcessed <= minSize || mainResult != SZ_OK)\r |
91 | {\r |
92 | minSize = outSizeProcessed;\r |
93 | bestIsFiltered = curModeIsFiltered;\r |
94 | mainResult = SZ_OK;\r |
95 | }\r |
96 | }\r |
97 | }\r |
98 | dest[0] = (Byte)(bestIsFiltered ? 1 : 0);\r |
99 | *destLen = LZMA86_HEADER_SIZE + minSize;\r |
100 | }\r |
101 | if (useFilter)\r |
102 | MyFree(filteredStream);\r |
103 | return mainResult;\r |
104 | }\r |