diff options
Diffstat (limited to 'CPP/7zip/Archive/Zip/ZipIn.cpp')
| -rwxr-xr-x | CPP/7zip/Archive/Zip/ZipIn.cpp | 797 |
1 files changed, 797 insertions, 0 deletions
diff --git a/CPP/7zip/Archive/Zip/ZipIn.cpp b/CPP/7zip/Archive/Zip/ZipIn.cpp new file mode 100755 index 00000000..c9e3a7d1 --- /dev/null +++ b/CPP/7zip/Archive/Zip/ZipIn.cpp @@ -0,0 +1,797 @@ +// Archive/ZipIn.cpp + +#include "StdAfx.h" + +#include "ZipIn.h" +#include "Windows/Defs.h" +#include "Common/StringConvert.h" +#include "Common/DynamicBuffer.h" +#include "../../Common/LimitedStreams.h" +#include "../../Common/StreamUtils.h" + +namespace NArchive { +namespace NZip { + +// static const char kEndOfString = '\0'; + +bool CInArchive::Open(IInStream *inStream, const UInt64 *searchHeaderSizeLimit) +{ + m_Stream = inStream; + if(m_Stream->Seek(0, STREAM_SEEK_CUR, &m_StreamStartPosition) != S_OK) + return false; + m_Position = m_StreamStartPosition; + return FindAndReadMarker(searchHeaderSizeLimit); +} + +void CInArchive::Close() +{ + m_Stream.Release(); +} + +HRESULT CInArchive::Seek(UInt64 offset) +{ + return m_Stream->Seek(offset, STREAM_SEEK_SET, NULL); +} + +////////////////////////////////////// +// Markers + +static inline bool TestMarkerCandidate(const Byte *p, UInt32 &value) +{ + value = p[0] | (((UInt32)p[1]) << 8) | (((UInt32)p[2]) << 16) | (((UInt32)p[3]) << 24); + return (value == NSignature::kLocalFileHeader) || + (value == NSignature::kEndOfCentralDir); +} + +bool CInArchive::FindAndReadMarker(const UInt64 *searchHeaderSizeLimit) +{ + m_ArchiveInfo.Clear(); + m_Position = m_StreamStartPosition; + if(Seek(m_StreamStartPosition) != S_OK) + return false; + + Byte marker[NSignature::kMarkerSize]; + UInt32 processedSize; + ReadBytes(marker, NSignature::kMarkerSize, &processedSize); + if(processedSize != NSignature::kMarkerSize) + return false; + if (TestMarkerCandidate(marker, m_Signature)) + return true; + + CByteDynamicBuffer dynamicBuffer; + static const UInt32 kSearchMarkerBufferSize = 0x10000; + dynamicBuffer.EnsureCapacity(kSearchMarkerBufferSize); + Byte *buffer = dynamicBuffer; + UInt32 numBytesPrev = NSignature::kMarkerSize - 1; + memmove(buffer, marker + 1, numBytesPrev); + UInt64 curTestPos = m_StreamStartPosition + 1; + for (;;) + { + if (searchHeaderSizeLimit != NULL) + if (curTestPos - m_StreamStartPosition > *searchHeaderSizeLimit) + break; + UInt32 numReadBytes = kSearchMarkerBufferSize - numBytesPrev; + ReadBytes(buffer + numBytesPrev, numReadBytes, &processedSize); + UInt32 numBytesInBuffer = numBytesPrev + processedSize; + if (numBytesInBuffer < NSignature::kMarkerSize) + break; + UInt32 numTests = numBytesInBuffer - NSignature::kMarkerSize + 1; + for(UInt32 pos = 0; pos < numTests; pos++, curTestPos++) + { + if (TestMarkerCandidate(buffer + pos, m_Signature)) + { + m_ArchiveInfo.StartPosition = curTestPos; + // m_ArchiveInfo.Base = m_ArchiveInfo.StartPosition; + // m_ArchiveInfo.Base = 0; + m_Position = curTestPos + NSignature::kMarkerSize; + if(Seek(m_Position) != S_OK) + return false; + return true; + } + } + numBytesPrev = numBytesInBuffer - numTests; + memmove(buffer, buffer + numTests, numBytesPrev); + } + return false; +} + +HRESULT CInArchive::ReadBytes(void *data, UInt32 size, UInt32 *processedSize) +{ + UInt32 realProcessedSize; + HRESULT result = ReadStream(m_Stream, data, size, &realProcessedSize); + if(processedSize != NULL) + *processedSize = realProcessedSize; + m_Position += realProcessedSize; + return result; +} + +void CInArchive::IncreaseRealPosition(UInt64 addValue) +{ + if(m_Stream->Seek(addValue, STREAM_SEEK_CUR, &m_Position) != S_OK) + throw CInArchiveException(CInArchiveException::kSeekStreamError); +} + +bool CInArchive::ReadBytesAndTestSize(void *data, UInt32 size) +{ + UInt32 realProcessedSize; + if(ReadBytes(data, size, &realProcessedSize) != S_OK) + throw CInArchiveException(CInArchiveException::kReadStreamError); + return (realProcessedSize == size); +} + +void CInArchive::SafeReadBytes(void *data, UInt32 size) +{ + if(!ReadBytesAndTestSize(data, size)) + throw CInArchiveException(CInArchiveException::kUnexpectedEndOfArchive); +} + +void CInArchive::ReadBuffer(CByteBuffer &buffer, UInt32 size) +{ + buffer.SetCapacity(size); + if (size > 0) + SafeReadBytes(buffer, size); +} + +Byte CInArchive::ReadByte() +{ + Byte b; + SafeReadBytes(&b, 1); + return b; +} + +UInt16 CInArchive::ReadUInt16() +{ + UInt16 value = 0; + for (int i = 0; i < 2; i++) + value |= (((UInt16)ReadByte()) << (8 * i)); + return value; +} + +UInt32 CInArchive::ReadUInt32() +{ + UInt32 value = 0; + for (int i = 0; i < 4; i++) + value |= (((UInt32)ReadByte()) << (8 * i)); + return value; +} + +UInt64 CInArchive::ReadUInt64() +{ + UInt64 value = 0; + for (int i = 0; i < 8; i++) + value |= (((UInt64)ReadByte()) << (8 * i)); + return value; +} + +bool CInArchive::ReadUInt32(UInt32 &value) +{ + value = 0; + for (int i = 0; i < 4; i++) + { + Byte b; + if (!ReadBytesAndTestSize(&b, 1)) + return false; + value |= (UInt32(b) << (8 * i)); + } + return true; +} + + +AString CInArchive::ReadFileName(UInt32 nameSize) +{ + if (nameSize == 0) + return AString(); + SafeReadBytes(m_NameBuffer.GetBuffer(nameSize), nameSize); + m_NameBuffer.ReleaseBuffer(nameSize); + return m_NameBuffer; +} + +void CInArchive::GetArchiveInfo(CInArchiveInfo &archiveInfo) const +{ + archiveInfo = m_ArchiveInfo; +} + +/* +void CInArchive::ThrowIncorrectArchiveException() +{ + throw CInArchiveException(CInArchiveException::kIncorrectArchive); +} +*/ + +static UInt32 GetUInt32(const Byte *data) +{ + return + ((UInt32)(Byte)data[0]) | + (((UInt32)(Byte)data[1]) << 8) | + (((UInt32)(Byte)data[2]) << 16) | + (((UInt32)(Byte)data[3]) << 24); +} + +/* +static UInt16 GetUInt16(const Byte *data) +{ + return + ((UInt16)(Byte)data[0]) | + (((UInt16)(Byte)data[1]) << 8); +} +*/ + +static UInt64 GetUInt64(const Byte *data) +{ + return GetUInt32(data) | ((UInt64)GetUInt32(data + 4) << 32); +} + + + +void CInArchive::ReadExtra(UInt32 extraSize, CExtraBlock &extraBlock, + UInt64 &unpackSize, UInt64 &packSize, UInt64 &localHeaderOffset, UInt32 &diskStartNumber) +{ + extraBlock.Clear(); + UInt32 remain = extraSize; + while(remain >= 4) + { + CExtraSubBlock subBlock; + subBlock.ID = ReadUInt16(); + UInt32 dataSize = ReadUInt16(); + remain -= 4; + if (dataSize > remain) // it's bug + dataSize = remain; + if (subBlock.ID == NFileHeader::NExtraID::kZip64) + { + if (unpackSize == 0xFFFFFFFF) + { + if (dataSize < 8) + break; + unpackSize = ReadUInt64(); + remain -= 8; + dataSize -= 8; + } + if (packSize == 0xFFFFFFFF) + { + if (dataSize < 8) + break; + packSize = ReadUInt64(); + remain -= 8; + dataSize -= 8; + } + if (localHeaderOffset == 0xFFFFFFFF) + { + if (dataSize < 8) + break; + localHeaderOffset = ReadUInt64(); + remain -= 8; + dataSize -= 8; + } + if (diskStartNumber == 0xFFFF) + { + if (dataSize < 4) + break; + diskStartNumber = ReadUInt32(); + remain -= 4; + dataSize -= 4; + } + for (UInt32 i = 0; i < dataSize; i++) + ReadByte(); + } + else + { + ReadBuffer(subBlock.Data, dataSize); + extraBlock.SubBlocks.Add(subBlock); + } + remain -= dataSize; + } + IncreaseRealPosition(remain); +} + +HRESULT CInArchive::ReadLocalItem(CItemEx &item) +{ + item.ExtractVersion.Version = ReadByte(); + item.ExtractVersion.HostOS = ReadByte(); + item.Flags = ReadUInt16(); // & NFileHeader::NFlags::kUsedBitsMask; + item.CompressionMethod = ReadUInt16(); + item.Time = ReadUInt32(); + item.FileCRC = ReadUInt32(); + item.PackSize = ReadUInt32(); + item.UnPackSize = ReadUInt32(); + UInt32 fileNameSize = ReadUInt16(); + item.LocalExtraSize = ReadUInt16(); + item.Name = ReadFileName(fileNameSize); + item.FileHeaderWithNameSize = 4 + NFileHeader::kLocalBlockSize + fileNameSize; + if (item.LocalExtraSize > 0) + { + UInt64 localHeaderOffset = 0; + UInt32 diskStartNumber = 0; + ReadExtra(item.LocalExtraSize, item.LocalExtra, item.UnPackSize, item.PackSize, + localHeaderOffset, diskStartNumber); + } + /* + if (item.IsDirectory()) + item.UnPackSize = 0; // check It + */ + return S_OK; +} + +HRESULT CInArchive::ReadLocalItemAfterCdItem(CItemEx &item) +{ + if (item.FromLocal) + return S_OK; + try + { + RINOK(Seek(m_ArchiveInfo.Base + item.LocalHeaderPosition)); + CItemEx localItem; + if (ReadUInt32() != NSignature::kLocalFileHeader) + return S_FALSE; + RINOK(ReadLocalItem(localItem)); + if (item.Flags != localItem.Flags) + { + if (item.CompressionMethod != NFileHeader::NCompressionMethod::kDeflated || + (item.Flags & 0xFFFC) != (localItem.Flags & 0xFFFC)) + return S_FALSE; + } + + if (item.CompressionMethod != localItem.CompressionMethod || + // item.Time != localItem.Time || + (!localItem.HasDescriptor() && + ( + item.FileCRC != localItem.FileCRC || + item.PackSize != localItem.PackSize || + item.UnPackSize != localItem.UnPackSize + ) + ) || + item.Name.Length() != localItem.Name.Length() + ) + return S_FALSE; + item.FileHeaderWithNameSize = localItem.FileHeaderWithNameSize; + item.LocalExtraSize = localItem.LocalExtraSize; + item.LocalExtra = localItem.LocalExtra; + item.FromLocal = true; + } + catch(...) { return S_FALSE; } + return S_OK; +} + +HRESULT CInArchive::ReadLocalItemDescriptor(CItemEx &item) +{ + if (item.HasDescriptor()) + { + const int kBufferSize = (1 << 12); + Byte buffer[kBufferSize]; + + UInt32 numBytesInBuffer = 0; + UInt32 packedSize = 0; + + bool descriptorWasFound = false; + for (;;) + { + UInt32 processedSize; + RINOK(ReadBytes(buffer + numBytesInBuffer, kBufferSize - numBytesInBuffer, &processedSize)); + numBytesInBuffer += processedSize; + if (numBytesInBuffer < NFileHeader::kDataDescriptorSize) + return S_FALSE; + UInt32 i; + for (i = 0; i <= numBytesInBuffer - NFileHeader::kDataDescriptorSize; i++) + { + // descriptorSignature field is Info-ZIP's extension + // to Zip specification. + UInt32 descriptorSignature = GetUInt32(buffer + i); + + // !!!! It must be fixed for Zip64 archives + UInt32 descriptorPackSize = GetUInt32(buffer + i + 8); + if (descriptorSignature== NSignature::kDataDescriptor && descriptorPackSize == packedSize + i) + { + descriptorWasFound = true; + item.FileCRC = GetUInt32(buffer + i + 4); + item.PackSize = descriptorPackSize; + item.UnPackSize = GetUInt32(buffer + i + 12); + IncreaseRealPosition(Int64(Int32(0 - (numBytesInBuffer - i - NFileHeader::kDataDescriptorSize)))); + break; + } + } + if (descriptorWasFound) + break; + packedSize += i; + int j; + for (j = 0; i < numBytesInBuffer; i++, j++) + buffer[j] = buffer[i]; + numBytesInBuffer = j; + } + } + else + IncreaseRealPosition(item.PackSize); + return S_OK; +} + +HRESULT CInArchive::ReadLocalItemAfterCdItemFull(CItemEx &item) +{ + if (item.FromLocal) + return S_OK; + try + { + RINOK(ReadLocalItemAfterCdItem(item)); + if (item.HasDescriptor()) + { + RINOK(Seek(m_ArchiveInfo.Base + item.GetDataPosition() + item.PackSize)); + if (ReadUInt32() != NSignature::kDataDescriptor) + return S_FALSE; + UInt32 crc = ReadUInt32(); + UInt32 packSize = ReadUInt32(); + UInt32 unpackSize = ReadUInt32(); + if (crc != item.FileCRC || item.PackSize != packSize || item.UnPackSize != unpackSize) + return S_FALSE; + } + } + catch(...) { return S_FALSE; } + return S_OK; +} + +HRESULT CInArchive::ReadCdItem(CItemEx &item) +{ + item.FromCentral = true; + item.MadeByVersion.Version = ReadByte(); + item.MadeByVersion.HostOS = ReadByte(); + item.ExtractVersion.Version = ReadByte(); + item.ExtractVersion.HostOS = ReadByte(); + item.Flags = ReadUInt16(); // & NFileHeader::NFlags::kUsedBitsMask; + item.CompressionMethod = ReadUInt16(); + item.Time = ReadUInt32(); + item.FileCRC = ReadUInt32(); + item.PackSize = ReadUInt32(); + item.UnPackSize = ReadUInt32(); + UInt16 headerNameSize = ReadUInt16(); + UInt16 headerExtraSize = ReadUInt16(); + UInt16 headerCommentSize = ReadUInt16(); + UInt32 headerDiskNumberStart = ReadUInt16(); + item.InternalAttributes = ReadUInt16(); + item.ExternalAttributes = ReadUInt32(); + item.LocalHeaderPosition = ReadUInt32(); + item.Name = ReadFileName(headerNameSize); + + if (headerExtraSize > 0) + { + ReadExtra(headerExtraSize, item.CentralExtra, item.UnPackSize, item.PackSize, + item.LocalHeaderPosition, headerDiskNumberStart); + } + + if (headerDiskNumberStart != 0) + throw CInArchiveException(CInArchiveException::kMultiVolumeArchiveAreNotSupported); + + // May be these strings must be deleted + /* + if (item.IsDirectory()) + item.UnPackSize = 0; + */ + + ReadBuffer(item.Comment, headerCommentSize); + return S_OK; +} + +HRESULT CInArchive::TryEcd64(UInt64 offset, CCdInfo &cdInfo) +{ + RINOK(Seek(offset)); + const UInt32 kEcd64Size = 56; + Byte buf[kEcd64Size]; + if(!ReadBytesAndTestSize(buf, kEcd64Size)) + return S_FALSE; + if (GetUInt32(buf) != NSignature::kZip64EndOfCentralDir) + return S_FALSE; + // cdInfo.NumEntries = GetUInt64(buf + 24); + cdInfo.Size = GetUInt64(buf + 40); + cdInfo.Offset = GetUInt64(buf + 48); + return S_OK; +} + +HRESULT CInArchive::FindCd(CCdInfo &cdInfo) +{ + UInt64 endPosition; + RINOK(m_Stream->Seek(0, STREAM_SEEK_END, &endPosition)); + const UInt32 kBufSizeMax = (1 << 16) + kEcdSize + kZip64EcdLocatorSize; + Byte buf[kBufSizeMax]; + UInt32 bufSize = (endPosition < kBufSizeMax) ? (UInt32)endPosition : kBufSizeMax; + if (bufSize < kEcdSize) + return S_FALSE; + UInt64 startPosition = endPosition - bufSize; + RINOK(m_Stream->Seek(startPosition, STREAM_SEEK_SET, &m_Position)); + if (m_Position != startPosition) + return S_FALSE; + if (!ReadBytesAndTestSize(buf, bufSize)) + return S_FALSE; + for (int i = (int)(bufSize - kEcdSize); i >= 0; i--) + { + if (GetUInt32(buf + i) == NSignature::kEndOfCentralDir) + { + if (i >= kZip64EcdLocatorSize) + { + const Byte *locator = buf + i - kZip64EcdLocatorSize; + if (GetUInt32(locator) == NSignature::kZip64EndOfCentralDirLocator) + { + UInt64 ecd64Offset = GetUInt64(locator + 8); + if (TryEcd64(ecd64Offset, cdInfo) == S_OK) + return S_OK; + if (TryEcd64(m_ArchiveInfo.StartPosition + ecd64Offset, cdInfo) == S_OK) + { + m_ArchiveInfo.Base = m_ArchiveInfo.StartPosition; + return S_OK; + } + } + } + if (GetUInt32(buf + i + 4) == 0) + { + // cdInfo.NumEntries = GetUInt16(buf + i + 10); + cdInfo.Size = GetUInt32(buf + i + 12); + cdInfo.Offset = GetUInt32(buf + i + 16); + return S_OK; + } + } + } + return S_FALSE; +} + +HRESULT CInArchive::TryReadCd(CObjectVector<CItemEx> &items, UInt64 cdOffset, UInt64 cdSize) +{ + items.Clear(); + RINOK(m_Stream->Seek(cdOffset, STREAM_SEEK_SET, &m_Position)); + if (m_Position != cdOffset) + return S_FALSE; + while(m_Position - cdOffset < cdSize) + { + if(ReadUInt32() != NSignature::kCentralFileHeader) + return S_FALSE; + CItemEx cdItem; + RINOK(ReadCdItem(cdItem)); + items.Add(cdItem); + } + return (m_Position - cdOffset == cdSize) ? S_OK : S_FALSE; +} + +HRESULT CInArchive::ReadCd(CObjectVector<CItemEx> &items, UInt64 &cdOffset, UInt64 &cdSize) +{ + m_ArchiveInfo.Base = 0; + CCdInfo cdInfo; + RINOK(FindCd(cdInfo)); + HRESULT res = S_FALSE; + cdSize = cdInfo.Size; + cdOffset = cdInfo.Offset; + res = TryReadCd(items, m_ArchiveInfo.Base + cdOffset, cdSize); + if (res == S_FALSE && m_ArchiveInfo.Base == 0) + { + res = TryReadCd(items, cdInfo.Offset + m_ArchiveInfo.StartPosition, cdSize); + if (res == S_OK) + m_ArchiveInfo.Base = m_ArchiveInfo.StartPosition; + } + if (!ReadUInt32(m_Signature)) + return S_FALSE; + return res; +} + +HRESULT CInArchive::ReadLocalsAndCd(CObjectVector<CItemEx> &items, CProgressVirt *progress, UInt64 &cdOffset) +{ + items.Clear(); + while (m_Signature == NSignature::kLocalFileHeader) + { + // FSeek points to next byte after signature + // NFileHeader::CLocalBlock localHeader; + CItemEx item; + item.LocalHeaderPosition = m_Position - m_StreamStartPosition - 4; // points to signature; + RINOK(ReadLocalItem(item)); + item.FromLocal = true; + ReadLocalItemDescriptor(item); + items.Add(item); + if (progress != 0) + { + UInt64 numItems = items.Size(); + RINOK(progress->SetCompleted(&numItems)); + } + if (!ReadUInt32(m_Signature)) + break; + } + cdOffset = m_Position - 4; + for(int i = 0; i < items.Size(); i++) + { + if (progress != 0) + { + UInt64 numItems = items.Size(); + RINOK(progress->SetCompleted(&numItems)); + } + if(m_Signature != NSignature::kCentralFileHeader) + return S_FALSE; + + CItemEx cdItem; + RINOK(ReadCdItem(cdItem)); + + if (i == 0) + { + if (cdItem.LocalHeaderPosition == 0) + m_ArchiveInfo.Base = m_ArchiveInfo.StartPosition; + } + + int index; + int left = 0, right = items.Size(); + for (;;) + { + if (left >= right) + return S_FALSE; + index = (left + right) / 2; + UInt64 position = items[index].LocalHeaderPosition - m_ArchiveInfo.Base; + if (cdItem.LocalHeaderPosition == position) + break; + if (cdItem.LocalHeaderPosition < position) + right = index; + else + left = index + 1; + } + CItemEx &item = items[index]; + item.LocalHeaderPosition = cdItem.LocalHeaderPosition; + item.MadeByVersion = cdItem.MadeByVersion; + item.CentralExtra = cdItem.CentralExtra; + + if ( + // item.ExtractVersion != cdItem.ExtractVersion || + item.Flags != cdItem.Flags || + item.CompressionMethod != cdItem.CompressionMethod || + // item.Time != cdItem.Time || + item.FileCRC != cdItem.FileCRC) + return S_FALSE; + + if (item.Name.Length() != cdItem.Name.Length() || + item.PackSize != cdItem.PackSize || + item.UnPackSize != cdItem.UnPackSize + ) + return S_FALSE; + item.Name = cdItem.Name; + item.InternalAttributes = cdItem.InternalAttributes; + item.ExternalAttributes = cdItem.ExternalAttributes; + item.Comment = cdItem.Comment; + item.FromCentral = cdItem.FromCentral; + if (!ReadUInt32(m_Signature)) + return S_FALSE; + } + return S_OK; +} + +HRESULT CInArchive::ReadHeaders(CObjectVector<CItemEx> &items, CProgressVirt *progress) +{ + // m_Signature must be kLocalFileHeaderSignature or + // kEndOfCentralDirSignature + // m_Position points to next byte after signature + + items.Clear(); + if (progress != 0) + { + UInt64 numItems = items.Size(); + RINOK(progress->SetCompleted(&numItems)); + } + + UInt64 cdSize, cdStartOffset; + HRESULT res = ReadCd(items, cdStartOffset, cdSize); + if (res != S_FALSE && res != S_OK) + return res; + + /* + if (res != S_OK) + return res; + res = S_FALSE; + */ + + if (res == S_FALSE) + { + m_ArchiveInfo.Base = 0; + RINOK(m_Stream->Seek(m_ArchiveInfo.StartPosition, STREAM_SEEK_SET, &m_Position)); + if (m_Position != m_ArchiveInfo.StartPosition) + return S_FALSE; + if (!ReadUInt32(m_Signature)) + return S_FALSE; + RINOK(ReadLocalsAndCd(items, progress, cdStartOffset)); + cdSize = (m_Position - 4) - cdStartOffset; + cdStartOffset -= m_ArchiveInfo.Base; + } + + UInt32 thisDiskNumber = 0; + UInt32 startCDDiskNumber = 0; + UInt64 numEntriesInCDOnThisDisk = 0; + UInt64 numEntriesInCD = 0; + UInt64 cdSizeFromRecord = 0; + UInt64 cdStartOffsetFromRecord = 0; + bool isZip64 = false; + UInt64 zip64EcdStartOffset = m_Position - 4 - m_ArchiveInfo.Base; + if(m_Signature == NSignature::kZip64EndOfCentralDir) + { + isZip64 = true; + UInt64 recordSize = ReadUInt64(); + /* UInt16 versionMade = */ ReadUInt16(); + /* UInt16 versionNeedExtract = */ ReadUInt16(); + thisDiskNumber = ReadUInt32(); + startCDDiskNumber = ReadUInt32(); + numEntriesInCDOnThisDisk = ReadUInt64(); + numEntriesInCD = ReadUInt64(); + cdSizeFromRecord = ReadUInt64(); + cdStartOffsetFromRecord = ReadUInt64(); + IncreaseRealPosition(recordSize - kZip64EcdSize); + if (!ReadUInt32(m_Signature)) + return S_FALSE; + if (thisDiskNumber != 0 || startCDDiskNumber != 0) + throw CInArchiveException(CInArchiveException::kMultiVolumeArchiveAreNotSupported); + if (numEntriesInCDOnThisDisk != items.Size() || + numEntriesInCD != items.Size() || + cdSizeFromRecord != cdSize || + (cdStartOffsetFromRecord != cdStartOffset && + (!items.IsEmpty()))) + return S_FALSE; + } + if(m_Signature == NSignature::kZip64EndOfCentralDirLocator) + { + /* UInt32 startEndCDDiskNumber = */ ReadUInt32(); + UInt64 endCDStartOffset = ReadUInt64(); + /* UInt32 numberOfDisks = */ ReadUInt32(); + if (zip64EcdStartOffset != endCDStartOffset) + return S_FALSE; + if (!ReadUInt32(m_Signature)) + return S_FALSE; + } + if(m_Signature != NSignature::kEndOfCentralDir) + return S_FALSE; + + UInt16 thisDiskNumber16 = ReadUInt16(); + if (!isZip64 || thisDiskNumber16) + thisDiskNumber = thisDiskNumber16; + + UInt16 startCDDiskNumber16 = ReadUInt16(); + if (!isZip64 || startCDDiskNumber16 != 0xFFFF) + startCDDiskNumber = startCDDiskNumber16; + + UInt16 numEntriesInCDOnThisDisk16 = ReadUInt16(); + if (!isZip64 || numEntriesInCDOnThisDisk16 != 0xFFFF) + numEntriesInCDOnThisDisk = numEntriesInCDOnThisDisk16; + + UInt16 numEntriesInCD16 = ReadUInt16(); + if (!isZip64 || numEntriesInCD16 != 0xFFFF) + numEntriesInCD = numEntriesInCD16; + + UInt32 cdSizeFromRecord32 = ReadUInt32(); + if (!isZip64 || cdSizeFromRecord32 != 0xFFFFFFFF) + cdSizeFromRecord = cdSizeFromRecord32; + + UInt32 cdStartOffsetFromRecord32 = ReadUInt32(); + if (!isZip64 || cdStartOffsetFromRecord32 != 0xFFFFFFFF) + cdStartOffsetFromRecord = cdStartOffsetFromRecord32; + + UInt16 commentSize = ReadUInt16(); + ReadBuffer(m_ArchiveInfo.Comment, commentSize); + + if (thisDiskNumber != 0 || startCDDiskNumber != 0) + throw CInArchiveException(CInArchiveException::kMultiVolumeArchiveAreNotSupported); + if ((UInt16)numEntriesInCDOnThisDisk != ((UInt16)items.Size()) || + (UInt16)numEntriesInCD != ((UInt16)items.Size()) || + (UInt32)cdSizeFromRecord != (UInt32)cdSize || + ((UInt32)(cdStartOffsetFromRecord) != (UInt32)cdStartOffset && + (!items.IsEmpty()))) + return S_FALSE; + + return S_OK; +} + +ISequentialInStream* CInArchive::CreateLimitedStream(UInt64 position, UInt64 size) +{ + CLimitedSequentialInStream *streamSpec = new CLimitedSequentialInStream; + CMyComPtr<ISequentialInStream> inStream(streamSpec); + SeekInArchive(m_ArchiveInfo.Base + position); + streamSpec->SetStream(m_Stream); + streamSpec->Init(size); + return inStream.Detach(); +} + +IInStream* CInArchive::CreateStream() +{ + CMyComPtr<IInStream> inStream = m_Stream; + return inStream.Detach(); +} + +bool CInArchive::SeekInArchive(UInt64 position) +{ + UInt64 newPosition; + if(m_Stream->Seek(position, STREAM_SEEK_SET, &newPosition) != S_OK) + return false; + return (newPosition == position); +} + +}} + |