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-rwxr-xr-xC/XzIn.c306
1 files changed, 306 insertions, 0 deletions
diff --git a/C/XzIn.c b/C/XzIn.c
new file mode 100755
index 0000000..356d019
--- /dev/null
+++ b/C/XzIn.c
@@ -0,0 +1,306 @@
+/* XzIn.c - Xz input
+2009-06-19 : Igor Pavlov : Public domain */
+
+#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, 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;
+}
+
+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)
+ {
+ Int64 i = 0;
+ *startOffset += XZ_STREAM_FOOTER_SIZE;
+ for (;;)
+ {
+ int j;
+ size_t processedSize;
+ #define TEMP_BUF_SIZE (1 << 10)
+ Byte tempBuf[TEMP_BUF_SIZE];
+ if (*startOffset < XZ_STREAM_FOOTER_SIZE || i > (1 << 16))
+ return SZ_ERROR_NO_ARCHIVE;
+ processedSize = (*startOffset > TEMP_BUF_SIZE) ? TEMP_BUF_SIZE : (size_t)*startOffset;
+ i += processedSize;
+ *startOffset = -(Int64)processedSize;
+ RINOK(SeekFromCur(stream, startOffset));
+ RINOK(LookInStream_Read2(stream, tempBuf, processedSize, SZ_ERROR_NO_ARCHIVE));
+ for (j = (int)processedSize; j >= 0; j--)
+ if (tempBuf[j -1] != 0)
+ break;
+ if (j != 0)
+ {
+ if ((j & 3) != 0)
+ return SZ_ERROR_NO_ARCHIVE;
+ *startOffset += j;
+ 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;
+ break;
+ }
+ }
+ }
+
+ 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;
+ 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;
+}