| 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 |