91 lines
1.9 KiB
C
91 lines
1.9 KiB
C
/* Xz.c - Xz
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2015-05-01 : Igor Pavlov : Public domain */
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#include "Precomp.h"
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#include "7zCrc.h"
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#include "CpuArch.h"
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#include "Xz.h"
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#include "XzCrc64.h"
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const Byte XZ_SIG[XZ_SIG_SIZE] = { 0xFD, '7', 'z', 'X', 'Z', 0 };
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const Byte XZ_FOOTER_SIG[XZ_FOOTER_SIG_SIZE] = { 'Y', 'Z' };
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unsigned Xz_WriteVarInt(Byte *buf, UInt64 v)
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{
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unsigned i = 0;
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do
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{
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buf[i++] = (Byte)((v & 0x7F) | 0x80);
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v >>= 7;
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}
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while (v != 0);
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buf[i - 1] &= 0x7F;
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return i;
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}
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void Xz_Construct(CXzStream *p)
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{
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p->numBlocks = p->numBlocksAllocated = 0;
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p->blocks = 0;
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p->flags = 0;
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}
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void Xz_Free(CXzStream *p, ISzAlloc *alloc)
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{
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alloc->Free(alloc, p->blocks);
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p->numBlocks = p->numBlocksAllocated = 0;
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p->blocks = 0;
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}
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unsigned XzFlags_GetCheckSize(CXzStreamFlags f)
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{
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unsigned t = XzFlags_GetCheckType(f);
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return (t == 0) ? 0 : (4 << ((t - 1) / 3));
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}
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void XzCheck_Init(CXzCheck *p, unsigned mode)
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{
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p->mode = mode;
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switch (mode)
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{
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case XZ_CHECK_CRC32: p->crc = CRC_INIT_VAL; break;
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case XZ_CHECK_CRC64: p->crc64 = CRC64_INIT_VAL; break;
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case XZ_CHECK_SHA256: Sha256_Init(&p->sha); break;
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}
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}
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void XzCheck_Update(CXzCheck *p, const void *data, size_t size)
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{
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switch (p->mode)
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{
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case XZ_CHECK_CRC32: p->crc = CrcUpdate(p->crc, data, size); break;
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case XZ_CHECK_CRC64: p->crc64 = Crc64Update(p->crc64, data, size); break;
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case XZ_CHECK_SHA256: Sha256_Update(&p->sha, (const Byte *)data, size); break;
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}
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}
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int XzCheck_Final(CXzCheck *p, Byte *digest)
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{
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switch (p->mode)
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{
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case XZ_CHECK_CRC32:
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SetUi32(digest, CRC_GET_DIGEST(p->crc));
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break;
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case XZ_CHECK_CRC64:
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{
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int i;
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UInt64 v = CRC64_GET_DIGEST(p->crc64);
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for (i = 0; i < 8; i++, v >>= 8)
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digest[i] = (Byte)(v & 0xFF);
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break;
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}
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case XZ_CHECK_SHA256:
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Sha256_Final(&p->sha, digest);
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break;
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default:
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return 0;
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}
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return 1;
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}
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