SRes Xz_AddIndexRecord(CXzStream *p, UInt64 unpackSize, UInt64 totalSize, ISzAlloc *alloc)
{
if (p->blocks == 0 || p->numBlocksAllocated == p->numBlocks)
{
size_t num = (p->numBlocks + 1) * 2;
size_t newSize = sizeof(CXzBlockSizes) * num;
CXzBlockSizes *blocks;
if (newSize / sizeof(CXzBlockSizes) != num)
return SZ_ERROR_MEM;
blocks = alloc->Alloc(alloc, newSize);
if (blocks == 0)
return SZ_ERROR_MEM;
if (p->numBlocks != 0)
{
memcpy(blocks, p->blocks, p->numBlocks * sizeof(CXzBlockSizes));
Xz_Free(p, alloc);
}
p->blocks = blocks;
p->numBlocksAllocated = num;
}
{
CXzBlockSizes *block = &p->blocks[p->numBlocks++];
block->totalSize = totalSize;
block->unpackSize = unpackSize;
}
return SZ_OK;
}
void Xzs_Free(CXzs *p, ISzAllocPtr alloc)
{
size_t i;
for (i = 0; i < p->num; i++)
Xz_Free(&p->streams[i], alloc);
ISzAlloc_Free(alloc, p->streams);
p->num = p->numAllocated = 0;
p->streams = 0;
}
SRes Xz_EncodeEmpty(ISeqOutStream *outStream)
{
SRes res;
CXzStream xz;
Xz_Construct(&xz);
res = Xz_WriteHeader(xz.flags, outStream);
if (res == SZ_OK)
res = Xz_WriteFooter(&xz, outStream);
Xz_Free(&xz, &g_Alloc);
return res;
}
SRes Xz_Encode(ISeqOutStream *outStream, ISeqInStream *inStream,
const CXzProps *props, ICompressProgress *progress)
{
SRes res;
CXzStream xz;
CLzma2WithFilters lzmaf;
Xz_Construct(&xz);
Lzma2WithFilters_Construct(&lzmaf, &g_Alloc, &g_BigAlloc);
res = Lzma2WithFilters_Create(&lzmaf);
if (res == SZ_OK)
res = Xz_Compress(&xz, &lzmaf, outStream, inStream, props, progress);
Lzma2WithFilters_Free(&lzmaf);
Xz_Free(&xz, &g_Alloc);
return res;
}
static SRes Xz_ReadIndex2(CXzStream *p, const Byte *buf, size_t size, ISzAlloc *alloc)
{
size_t i, numBlocks, crcStartPos, 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;
}
crcStartPos = pos;
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;
}
