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