2 2015-05-01 : Igor Pavlov : Public domain */
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11 const Byte XZ_SIG[XZ_SIG_SIZE] = { 0xFD, '7', 'z', 'X', 'Z', 0 };
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12 const Byte XZ_FOOTER_SIG[XZ_FOOTER_SIG_SIZE] = { 'Y', 'Z' };
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14 unsigned Xz_WriteVarInt(Byte *buf, UInt64 v)
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19 buf[i++] = (Byte)((v & 0x7F) | 0x80);
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27 void Xz_Construct(CXzStream *p)
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29 p->numBlocks = p->numBlocksAllocated = 0;
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34 void Xz_Free(CXzStream *p, ISzAlloc *alloc)
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36 alloc->Free(alloc, p->blocks);
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37 p->numBlocks = p->numBlocksAllocated = 0;
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41 unsigned XzFlags_GetCheckSize(CXzStreamFlags f)
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43 unsigned t = XzFlags_GetCheckType(f);
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44 return (t == 0) ? 0 : (4 << ((t - 1) / 3));
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47 void XzCheck_Init(CXzCheck *p, unsigned mode)
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52 case XZ_CHECK_CRC32: p->crc = CRC_INIT_VAL; break;
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53 case XZ_CHECK_CRC64: p->crc64 = CRC64_INIT_VAL; break;
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54 case XZ_CHECK_SHA256: Sha256_Init(&p->sha); break;
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58 void XzCheck_Update(CXzCheck *p, const void *data, size_t size)
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62 case XZ_CHECK_CRC32: p->crc = CrcUpdate(p->crc, data, size); break;
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63 case XZ_CHECK_CRC64: p->crc64 = Crc64Update(p->crc64, data, size); break;
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64 case XZ_CHECK_SHA256: Sha256_Update(&p->sha, (const Byte *)data, size); break;
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68 int XzCheck_Final(CXzCheck *p, Byte *digest)
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72 case XZ_CHECK_CRC32:
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73 SetUi32(digest, CRC_GET_DIGEST(p->crc));
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75 case XZ_CHECK_CRC64:
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78 UInt64 v = CRC64_GET_DIGEST(p->crc64);
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79 for (i = 0; i < 8; i++, v >>= 8)
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80 digest[i] = (Byte)(v & 0xFF);
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83 case XZ_CHECK_SHA256:
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84 Sha256_Final(&p->sha, digest);
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