SRes Xzs_ReadBackward(CXzs *p, ILookInStream *stream, Int64 *startOffset, ICompressProgress *progress, ISzAllocPtr alloc)
{
Int64 endOffset = 0;
RINOK(ILookInStream_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 *)ISzAlloc_Alloc(alloc, newNum * sizeof(CXzStream));
if (!data)
return SZ_ERROR_MEM;
p->numAllocated = newNum;
if (p->num != 0)
memcpy(data, p->streams, p->num * sizeof(CXzStream));
ISzAlloc_Free(alloc, p->streams);
p->streams = (CXzStream *)data;
}
p->streams[p->num++] = st;
if (*startOffset == 0)
break;
RINOK(LookInStream_SeekTo(stream, *startOffset));
if (progress && ICompressProgress_Progress(progress, endOffset - *startOffset, (UInt64)(Int64)-1) != SZ_OK)
return SZ_ERROR_PROGRESS;
}
return SZ_OK;
}
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;
}
