ce188d4d |
1 | /* Xz.c - Xz\r |
2 | 2015-05-01 : Igor Pavlov : Public domain */\r |
3 | \r |
4 | #include "Precomp.h"\r |
5 | \r |
6 | #include "7zCrc.h"\r |
7 | #include "CpuArch.h"\r |
8 | #include "Xz.h"\r |
9 | #include "XzCrc64.h"\r |
10 | \r |
11 | const Byte XZ_SIG[XZ_SIG_SIZE] = { 0xFD, '7', 'z', 'X', 'Z', 0 };\r |
12 | const Byte XZ_FOOTER_SIG[XZ_FOOTER_SIG_SIZE] = { 'Y', 'Z' };\r |
13 | \r |
14 | unsigned Xz_WriteVarInt(Byte *buf, UInt64 v)\r |
15 | {\r |
16 | unsigned i = 0;\r |
17 | do\r |
18 | {\r |
19 | buf[i++] = (Byte)((v & 0x7F) | 0x80);\r |
20 | v >>= 7;\r |
21 | }\r |
22 | while (v != 0);\r |
23 | buf[i - 1] &= 0x7F;\r |
24 | return i;\r |
25 | }\r |
26 | \r |
27 | void Xz_Construct(CXzStream *p)\r |
28 | {\r |
29 | p->numBlocks = p->numBlocksAllocated = 0;\r |
30 | p->blocks = 0;\r |
31 | p->flags = 0;\r |
32 | }\r |
33 | \r |
34 | void Xz_Free(CXzStream *p, ISzAlloc *alloc)\r |
35 | {\r |
36 | alloc->Free(alloc, p->blocks);\r |
37 | p->numBlocks = p->numBlocksAllocated = 0;\r |
38 | p->blocks = 0;\r |
39 | }\r |
40 | \r |
41 | unsigned XzFlags_GetCheckSize(CXzStreamFlags f)\r |
42 | {\r |
43 | unsigned t = XzFlags_GetCheckType(f);\r |
44 | return (t == 0) ? 0 : (4 << ((t - 1) / 3));\r |
45 | }\r |
46 | \r |
47 | void XzCheck_Init(CXzCheck *p, unsigned mode)\r |
48 | {\r |
49 | p->mode = mode;\r |
50 | switch (mode)\r |
51 | {\r |
52 | case XZ_CHECK_CRC32: p->crc = CRC_INIT_VAL; break;\r |
53 | case XZ_CHECK_CRC64: p->crc64 = CRC64_INIT_VAL; break;\r |
54 | case XZ_CHECK_SHA256: Sha256_Init(&p->sha); break;\r |
55 | }\r |
56 | }\r |
57 | \r |
58 | void XzCheck_Update(CXzCheck *p, const void *data, size_t size)\r |
59 | {\r |
60 | switch (p->mode)\r |
61 | {\r |
62 | case XZ_CHECK_CRC32: p->crc = CrcUpdate(p->crc, data, size); break;\r |
63 | case XZ_CHECK_CRC64: p->crc64 = Crc64Update(p->crc64, data, size); break;\r |
64 | case XZ_CHECK_SHA256: Sha256_Update(&p->sha, (const Byte *)data, size); break;\r |
65 | }\r |
66 | }\r |
67 | \r |
68 | int XzCheck_Final(CXzCheck *p, Byte *digest)\r |
69 | {\r |
70 | switch (p->mode)\r |
71 | {\r |
72 | case XZ_CHECK_CRC32:\r |
73 | SetUi32(digest, CRC_GET_DIGEST(p->crc));\r |
74 | break;\r |
75 | case XZ_CHECK_CRC64:\r |
76 | {\r |
77 | int i;\r |
78 | UInt64 v = CRC64_GET_DIGEST(p->crc64);\r |
79 | for (i = 0; i < 8; i++, v >>= 8)\r |
80 | digest[i] = (Byte)(v & 0xFF);\r |
81 | break;\r |
82 | }\r |
83 | case XZ_CHECK_SHA256:\r |
84 | Sha256_Final(&p->sha, digest);\r |
85 | break;\r |
86 | default:\r |
87 | return 0;\r |
88 | }\r |
89 | return 1;\r |
90 | }\r |