91 lines
1.9 KiB
C
Executable File
91 lines
1.9 KiB
C
Executable File
/* 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;
|
|
}
|