/* Xz.c - Xz | |
2009-04-15 : Igor Pavlov : Public domain */ | |
#include "7zCrc.h" | |
#include "CpuArch.h" | |
#include "Xz.h" | |
#include "XzCrc64.h" | |
Byte XZ_SIG[XZ_SIG_SIZE] = { 0xFD, '7', 'z', 'X', 'Z', 0 }; | |
Byte XZ_FOOTER_SIG[XZ_FOOTER_SIG_SIZE] = { 'Y', 'Z' }; | |
unsigned Xz_WriteVarInt(Byte *buf, UInt64 v) | |
{ | |
unsigned i = 0; | |
do | |
{ | |
buf[i++] = (Byte)((v & 0x7F) | 0x80); | |
v >>= 7; | |
} | |
while (v != 0); | |
buf[i - 1] &= 0x7F; | |
return i; | |
} | |
void Xz_Construct(CXzStream *p) | |
{ | |
p->numBlocks = p->numBlocksAllocated = 0; | |
p->blocks = 0; | |
p->flags = 0; | |
} | |
void Xz_Free(CXzStream *p, ISzAlloc *alloc) | |
{ | |
alloc->Free(alloc, p->blocks); | |
p->numBlocks = p->numBlocksAllocated = 0; | |
p->blocks = 0; | |
} | |
unsigned XzFlags_GetCheckSize(CXzStreamFlags f) | |
{ | |
int t = XzFlags_GetCheckType(f); | |
return (t == 0) ? 0 : (4 << ((t - 1) / 3)); | |
} | |
void XzCheck_Init(CXzCheck *p, int mode) | |
{ | |
p->mode = mode; | |
switch (mode) | |
{ | |
case XZ_CHECK_CRC32: p->crc = CRC_INIT_VAL; break; | |
case XZ_CHECK_CRC64: p->crc64 = CRC64_INIT_VAL; break; | |
case XZ_CHECK_SHA256: Sha256_Init(&p->sha); break; | |
} | |
} | |
void XzCheck_Update(CXzCheck *p, const void *data, size_t size) | |
{ | |
switch (p->mode) | |
{ | |
case XZ_CHECK_CRC32: p->crc = CrcUpdate(p->crc, data, size); break; | |
case XZ_CHECK_CRC64: p->crc64 = Crc64Update(p->crc64, data, size); break; | |
case XZ_CHECK_SHA256: Sha256_Update(&p->sha, (const Byte *)data, size); break; | |
} | |
} | |
int XzCheck_Final(CXzCheck *p, Byte *digest) | |
{ | |
switch (p->mode) | |
{ | |
case XZ_CHECK_CRC32: | |
SetUi32(digest, CRC_GET_DIGEST(p->crc)); | |
break; | |
case XZ_CHECK_CRC64: | |
{ | |
int i; | |
UInt64 v = CRC64_GET_DIGEST(p->crc64); | |
for (i = 0; i < 8; i++, v >>= 8) | |
digest[i] = (Byte)(v & 0xFF); | |
break; | |
} | |
case XZ_CHECK_SHA256: | |
Sha256_Final(&p->sha, digest); | |
break; | |
default: | |
return 0; | |
} | |
return 1; | |
} |