mirror of
https://github.com/alliedmodders/hl2sdk.git
synced 2024-12-22 17:47:38 +08:00
308 lines
8.4 KiB
C
308 lines
8.4 KiB
C
/* XzIn.c - Xz input
|
|
2014-12-30 : Igor Pavlov : Public domain */
|
|
|
|
#include "Precomp.h"
|
|
|
|
#include <string.h>
|
|
|
|
#include "7zCrc.h"
|
|
#include "CpuArch.h"
|
|
#include "Xz.h"
|
|
|
|
SRes Xz_ReadHeader(CXzStreamFlags *p, ISeqInStream *inStream)
|
|
{
|
|
Byte sig[XZ_STREAM_HEADER_SIZE];
|
|
RINOK(SeqInStream_Read2(inStream, sig, XZ_STREAM_HEADER_SIZE, SZ_ERROR_NO_ARCHIVE));
|
|
if (memcmp(sig, XZ_SIG, XZ_SIG_SIZE) != 0)
|
|
return SZ_ERROR_NO_ARCHIVE;
|
|
return Xz_ParseHeader(p, sig);
|
|
}
|
|
|
|
#define READ_VARINT_AND_CHECK(buf, pos, size, res) \
|
|
{ unsigned s = Xz_ReadVarInt(buf + pos, size - pos, res); \
|
|
if (s == 0) return SZ_ERROR_ARCHIVE; pos += s; }
|
|
|
|
SRes XzBlock_ReadHeader(CXzBlock *p, ISeqInStream *inStream, Bool *isIndex, UInt32 *headerSizeRes)
|
|
{
|
|
Byte header[XZ_BLOCK_HEADER_SIZE_MAX];
|
|
unsigned headerSize;
|
|
*headerSizeRes = 0;
|
|
RINOK(SeqInStream_ReadByte(inStream, &header[0]));
|
|
headerSize = ((unsigned)header[0] << 2) + 4;
|
|
if (headerSize == 0)
|
|
{
|
|
*headerSizeRes = 1;
|
|
*isIndex = True;
|
|
return SZ_OK;
|
|
}
|
|
|
|
*isIndex = False;
|
|
*headerSizeRes = headerSize;
|
|
RINOK(SeqInStream_Read(inStream, header + 1, headerSize - 1));
|
|
return XzBlock_Parse(p, header);
|
|
}
|
|
|
|
#define ADD_SIZE_CHECH(size, val) \
|
|
{ UInt64 newSize = size + (val); if (newSize < size) return XZ_SIZE_OVERFLOW; size = newSize; }
|
|
|
|
UInt64 Xz_GetUnpackSize(const CXzStream *p)
|
|
{
|
|
UInt64 size = 0;
|
|
size_t i;
|
|
for (i = 0; i < p->numBlocks; i++)
|
|
ADD_SIZE_CHECH(size, p->blocks[i].unpackSize);
|
|
return size;
|
|
}
|
|
|
|
UInt64 Xz_GetPackSize(const CXzStream *p)
|
|
{
|
|
UInt64 size = 0;
|
|
size_t i;
|
|
for (i = 0; i < p->numBlocks; i++)
|
|
ADD_SIZE_CHECH(size, (p->blocks[i].totalSize + 3) & ~(UInt64)3);
|
|
return size;
|
|
}
|
|
|
|
/*
|
|
SRes XzBlock_ReadFooter(CXzBlock *p, CXzStreamFlags f, ISeqInStream *inStream)
|
|
{
|
|
return SeqInStream_Read(inStream, p->check, XzFlags_GetCheckSize(f));
|
|
}
|
|
*/
|
|
|
|
static SRes Xz_ReadIndex2(CXzStream *p, const Byte *buf, size_t size, ISzAlloc *alloc)
|
|
{
|
|
size_t i, numBlocks, pos = 1;
|
|
UInt32 crc;
|
|
|
|
if (size < 5 || buf[0] != 0)
|
|
return SZ_ERROR_ARCHIVE;
|
|
|
|
size -= 4;
|
|
crc = CrcCalc(buf, size);
|
|
if (crc != GetUi32(buf + size))
|
|
return SZ_ERROR_ARCHIVE;
|
|
|
|
{
|
|
UInt64 numBlocks64;
|
|
READ_VARINT_AND_CHECK(buf, pos, size, &numBlocks64);
|
|
numBlocks = (size_t)numBlocks64;
|
|
if (numBlocks != numBlocks64 || numBlocks * 2 > size)
|
|
return SZ_ERROR_ARCHIVE;
|
|
}
|
|
|
|
Xz_Free(p, alloc);
|
|
if (numBlocks != 0)
|
|
{
|
|
p->numBlocks = numBlocks;
|
|
p->numBlocksAllocated = numBlocks;
|
|
p->blocks = alloc->Alloc(alloc, sizeof(CXzBlockSizes) * numBlocks);
|
|
if (p->blocks == 0)
|
|
return SZ_ERROR_MEM;
|
|
for (i = 0; i < numBlocks; i++)
|
|
{
|
|
CXzBlockSizes *block = &p->blocks[i];
|
|
READ_VARINT_AND_CHECK(buf, pos, size, &block->totalSize);
|
|
READ_VARINT_AND_CHECK(buf, pos, size, &block->unpackSize);
|
|
if (block->totalSize == 0)
|
|
return SZ_ERROR_ARCHIVE;
|
|
}
|
|
}
|
|
while ((pos & 3) != 0)
|
|
if (buf[pos++] != 0)
|
|
return SZ_ERROR_ARCHIVE;
|
|
return (pos == size) ? SZ_OK : SZ_ERROR_ARCHIVE;
|
|
}
|
|
|
|
static SRes Xz_ReadIndex(CXzStream *p, ILookInStream *stream, UInt64 indexSize, ISzAlloc *alloc)
|
|
{
|
|
SRes res;
|
|
size_t size;
|
|
Byte *buf;
|
|
if (indexSize > ((UInt32)1 << 31))
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
size = (size_t)indexSize;
|
|
if (size != indexSize)
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
buf = alloc->Alloc(alloc, size);
|
|
if (buf == 0)
|
|
return SZ_ERROR_MEM;
|
|
res = LookInStream_Read2(stream, buf, size, SZ_ERROR_UNSUPPORTED);
|
|
if (res == SZ_OK)
|
|
res = Xz_ReadIndex2(p, buf, size, alloc);
|
|
alloc->Free(alloc, buf);
|
|
return res;
|
|
}
|
|
|
|
static SRes SeekFromCur(ILookInStream *inStream, Int64 *res)
|
|
{
|
|
return inStream->Seek(inStream, res, SZ_SEEK_CUR);
|
|
}
|
|
|
|
static SRes Xz_ReadBackward(CXzStream *p, ILookInStream *stream, Int64 *startOffset, ISzAlloc *alloc)
|
|
{
|
|
UInt64 indexSize;
|
|
Byte buf[XZ_STREAM_FOOTER_SIZE];
|
|
|
|
if ((*startOffset & 3) != 0 || *startOffset < XZ_STREAM_FOOTER_SIZE)
|
|
return SZ_ERROR_NO_ARCHIVE;
|
|
*startOffset = -XZ_STREAM_FOOTER_SIZE;
|
|
RINOK(SeekFromCur(stream, startOffset));
|
|
|
|
RINOK(LookInStream_Read2(stream, buf, XZ_STREAM_FOOTER_SIZE, SZ_ERROR_NO_ARCHIVE));
|
|
|
|
if (memcmp(buf + 10, XZ_FOOTER_SIG, XZ_FOOTER_SIG_SIZE) != 0)
|
|
{
|
|
UInt32 total = 0;
|
|
*startOffset += XZ_STREAM_FOOTER_SIZE;
|
|
for (;;)
|
|
{
|
|
size_t i;
|
|
#define TEMP_BUF_SIZE (1 << 10)
|
|
Byte tempBuf[TEMP_BUF_SIZE];
|
|
if (*startOffset < XZ_STREAM_FOOTER_SIZE || total > (1 << 16))
|
|
return SZ_ERROR_NO_ARCHIVE;
|
|
i = (*startOffset > TEMP_BUF_SIZE) ? TEMP_BUF_SIZE : (size_t)*startOffset;
|
|
total += (UInt32)i;
|
|
*startOffset = -(Int64)i;
|
|
RINOK(SeekFromCur(stream, startOffset));
|
|
RINOK(LookInStream_Read2(stream, tempBuf, i, SZ_ERROR_NO_ARCHIVE));
|
|
for (; i != 0; i--)
|
|
if (tempBuf[i - 1] != 0)
|
|
break;
|
|
if (i != 0)
|
|
{
|
|
if ((i & 3) != 0)
|
|
return SZ_ERROR_NO_ARCHIVE;
|
|
*startOffset += i;
|
|
break;
|
|
}
|
|
}
|
|
if (*startOffset < XZ_STREAM_FOOTER_SIZE)
|
|
return SZ_ERROR_NO_ARCHIVE;
|
|
*startOffset -= XZ_STREAM_FOOTER_SIZE;
|
|
RINOK(stream->Seek(stream, startOffset, SZ_SEEK_SET));
|
|
RINOK(LookInStream_Read2(stream, buf, XZ_STREAM_FOOTER_SIZE, SZ_ERROR_NO_ARCHIVE));
|
|
if (memcmp(buf + 10, XZ_FOOTER_SIG, XZ_FOOTER_SIG_SIZE) != 0)
|
|
return SZ_ERROR_NO_ARCHIVE;
|
|
}
|
|
|
|
p->flags = (CXzStreamFlags)GetBe16(buf + 8);
|
|
|
|
if (!XzFlags_IsSupported(p->flags))
|
|
return SZ_ERROR_UNSUPPORTED;
|
|
|
|
if (GetUi32(buf) != CrcCalc(buf + 4, 6))
|
|
return SZ_ERROR_ARCHIVE;
|
|
|
|
indexSize = ((UInt64)GetUi32(buf + 4) + 1) << 2;
|
|
|
|
*startOffset = -(Int64)(indexSize + XZ_STREAM_FOOTER_SIZE);
|
|
RINOK(SeekFromCur(stream, startOffset));
|
|
|
|
RINOK(Xz_ReadIndex(p, stream, indexSize, alloc));
|
|
|
|
{
|
|
UInt64 totalSize = Xz_GetPackSize(p);
|
|
UInt64 sum = XZ_STREAM_HEADER_SIZE + totalSize + indexSize;
|
|
if (totalSize == XZ_SIZE_OVERFLOW ||
|
|
sum >= ((UInt64)1 << 63) ||
|
|
totalSize >= ((UInt64)1 << 63))
|
|
return SZ_ERROR_ARCHIVE;
|
|
*startOffset = -(Int64)sum;
|
|
RINOK(SeekFromCur(stream, startOffset));
|
|
}
|
|
{
|
|
CXzStreamFlags headerFlags;
|
|
CSecToRead secToRead;
|
|
SecToRead_CreateVTable(&secToRead);
|
|
secToRead.realStream = stream;
|
|
|
|
RINOK(Xz_ReadHeader(&headerFlags, &secToRead.s));
|
|
return (p->flags == headerFlags) ? SZ_OK : SZ_ERROR_ARCHIVE;
|
|
}
|
|
}
|
|
|
|
|
|
/* ---------- Xz Streams ---------- */
|
|
|
|
void Xzs_Construct(CXzs *p)
|
|
{
|
|
p->num = p->numAllocated = 0;
|
|
p->streams = 0;
|
|
}
|
|
|
|
void Xzs_Free(CXzs *p, ISzAlloc *alloc)
|
|
{
|
|
size_t i;
|
|
for (i = 0; i < p->num; i++)
|
|
Xz_Free(&p->streams[i], alloc);
|
|
alloc->Free(alloc, p->streams);
|
|
p->num = p->numAllocated = 0;
|
|
p->streams = 0;
|
|
}
|
|
|
|
UInt64 Xzs_GetNumBlocks(const CXzs *p)
|
|
{
|
|
UInt64 num = 0;
|
|
size_t i;
|
|
for (i = 0; i < p->num; i++)
|
|
num += p->streams[i].numBlocks;
|
|
return num;
|
|
}
|
|
|
|
UInt64 Xzs_GetUnpackSize(const CXzs *p)
|
|
{
|
|
UInt64 size = 0;
|
|
size_t i;
|
|
for (i = 0; i < p->num; i++)
|
|
ADD_SIZE_CHECH(size, Xz_GetUnpackSize(&p->streams[i]));
|
|
return size;
|
|
}
|
|
|
|
/*
|
|
UInt64 Xzs_GetPackSize(const CXzs *p)
|
|
{
|
|
UInt64 size = 0;
|
|
size_t i;
|
|
for (i = 0; i < p->num; i++)
|
|
ADD_SIZE_CHECH(size, Xz_GetTotalSize(&p->streams[i]));
|
|
return size;
|
|
}
|
|
*/
|
|
|
|
SRes Xzs_ReadBackward(CXzs *p, ILookInStream *stream, Int64 *startOffset, ICompressProgress *progress, ISzAlloc *alloc)
|
|
{
|
|
Int64 endOffset = 0;
|
|
RINOK(stream->Seek(stream, &endOffset, SZ_SEEK_END));
|
|
*startOffset = endOffset;
|
|
for (;;)
|
|
{
|
|
CXzStream st;
|
|
SRes res;
|
|
Xz_Construct(&st);
|
|
res = Xz_ReadBackward(&st, stream, startOffset, alloc);
|
|
st.startOffset = *startOffset;
|
|
RINOK(res);
|
|
if (p->num == p->numAllocated)
|
|
{
|
|
size_t newNum = p->num + p->num / 4 + 1;
|
|
Byte *data = (Byte *)alloc->Alloc(alloc, newNum * sizeof(CXzStream));
|
|
if (data == 0)
|
|
return SZ_ERROR_MEM;
|
|
p->numAllocated = newNum;
|
|
if (p->num != 0)
|
|
memcpy(data, p->streams, p->num * sizeof(CXzStream));
|
|
alloc->Free(alloc, p->streams);
|
|
p->streams = (CXzStream *)data;
|
|
}
|
|
p->streams[p->num++] = st;
|
|
if (*startOffset == 0)
|
|
break;
|
|
RINOK(stream->Seek(stream, startOffset, SZ_SEEK_SET));
|
|
if (progress && progress->Progress(progress, endOffset - *startOffset, (UInt64)(Int64)-1) != SZ_OK)
|
|
return SZ_ERROR_PROGRESS;
|
|
}
|
|
return SZ_OK;
|
|
}
|