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; }