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/* Xz.c - Xz↩
2017-05-12 : Igor Pavlov : Public domain */↩
↩
#include "Precomp.h"↩
↩
#include "7zCrc.h"↩
#include "CpuArch.h"↩
#include "Xz.h"↩
#include "XzCrc64.h"↩
↩
const Byte XZ_SIG[XZ_SIG_SIZE] = { 0xFD, '7', 'z', 'X', 'Z', 0 };↩
/* const 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[(size_t)i - 1] &= 0x7F;↩
return i;↩
}↩
↩
void Xz_Construct(CXzStream *p)↩
{↩
p->numBlocks = 0;↩
p->blocks = NULL;↩
p->flags = 0;↩
}↩
↩
void Xz_Free(CXzStream *p, ISzAllocPtr alloc)↩
{↩
ISzAlloc_Free(alloc, p->blocks);↩
p->numBlocks = 0;↩
p->blocks = NULL;↩
}↩
↩
unsigned XzFlags_GetCheckSize(CXzStreamFlags f)↩
{↩
unsigned t = XzFlags_GetCheckType(f);↩
return (t == 0) ? 0 : (4 << ((t - 1) / 3));↩
}↩
↩
void XzCheck_Init(CXzCheck *p, unsigned 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;↩
}↩