Пример #1
0
        private void ReadCentralDirectory()
        {
            try
            {
                // assume ReadEndOfCentralDirectory has been called and has populated _centralDirectoryStart

                _archiveStream.Seek(_centralDirectoryStart, SeekOrigin.Begin);

                long numberOfEntries = 0;

                //read the central directory
                ZipCentralDirectoryFileHeader currentHeader;
                bool saveExtraFieldsAndComments = Mode == ZipArchiveMode.Update;
                while (ZipCentralDirectoryFileHeader.TryReadBlock(_archiveReader,
                                                                  saveExtraFieldsAndComments, out currentHeader))
                {
                    AddEntry(new ReadOnlyZipArchiveEntry(this, currentHeader));
                    numberOfEntries++;
                }

                if (numberOfEntries != _expectedNumberOfEntries)
                {
                    throw new InvalidDataException("NumEntriesWrong");
                }
            }
            catch (EndOfStreamException ex)
            {
                throw new InvalidDataException("CentralDirectoryInvalid", ex);
            }
        }
Пример #2
0
        // Initializes, attaches it to archive
        internal ReadOnlyZipArchiveEntry(ReadOnlyZipArchive archive, ZipCentralDirectoryFileHeader cd)
        {
            _archive = archive;

            _originallyInArchive = true;

            _diskNumberStart            = cd.DiskNumberStart;
            _versionMadeByPlatform      = ( ZipVersionMadeByPlatform )cd.VersionMadeByCompatibility;
            _versionMadeBySpecification = ( ZipVersionNeededValues )cd.VersionMadeBySpecification;
            _versionToExtract           = ( ZipVersionNeededValues )cd.VersionNeededToExtract;
            _generalPurposeBitFlag      = ( BitFlagValues )cd.GeneralPurposeBitFlag;
            CompressionMethod           = ( CompressionMethodValues )cd.CompressionMethod;
            _lastModified        = new DateTimeOffset(ZipHelper.DosTimeToDateTime(cd.LastModified));
            _compressedSize      = cd.CompressedSize;
            _uncompressedSize    = cd.UncompressedSize;
            _externalFileAttr    = cd.ExternalFileAttributes;
            _offsetOfLocalHeader = cd.RelativeOffsetOfLocalHeader;
            // we don't know this yet: should be _offsetOfLocalHeader + 30 + _storedEntryNameBytes.Length + extrafieldlength
            // but entryname/extra length could be different in LH
            _storedOffsetOfCompressedData = null;
            _crc32 = cd.Crc32;

            _compressedBytes        = null;
            _storedUncompressedData = null;
            _currentlyOpenForWrite  = false;
            _everOpenedForWrite     = false;
            _outstandingWriteStream = null;

            FullName = DecodeEntryName(cd.Filename);

            _lhUnknownExtraFields = null;
            // the cd should have these as null if we aren't in Update mode
            _cdUnknownExtraFields = cd.ExtraFields;
            _fileComment          = cd.FileComment;

            _compressionLevel = null;
        }
Пример #3
0
        // if saveExtraFieldsAndComments is false, FileComment and ExtraFields will be null
        // in either case, the zip64 extra field info will be incorporated into other fields
        public static bool TryReadBlock(BinaryReader reader, bool saveExtraFieldsAndComments, out ZipCentralDirectoryFileHeader header)
        {
            header = new ZipCentralDirectoryFileHeader();

            if (reader.ReadUInt32() != SignatureConstant)
            {
                return(false);
            }
            header.VersionMadeBySpecification = reader.ReadByte();
            header.VersionMadeByCompatibility = reader.ReadByte();
            header.VersionNeededToExtract     = reader.ReadUInt16();
            header.GeneralPurposeBitFlag      = reader.ReadUInt16();
            header.CompressionMethod          = reader.ReadUInt16();
            header.LastModified = reader.ReadUInt32();
            header.Crc32        = reader.ReadUInt32();
            uint compressedSizeSmall   = reader.ReadUInt32();
            uint uncompressedSizeSmall = reader.ReadUInt32();

            header.FilenameLength    = reader.ReadUInt16();
            header.ExtraFieldLength  = reader.ReadUInt16();
            header.FileCommentLength = reader.ReadUInt16();
            ushort diskNumberStartSmall = reader.ReadUInt16();

            header.InternalFileAttributes = reader.ReadUInt16();
            header.ExternalFileAttributes = reader.ReadUInt32();
            uint relativeOffsetOfLocalHeaderSmall = reader.ReadUInt32();

            header.Filename = reader.ReadBytes(header.FilenameLength);

            bool uncompressedSizeInZip64 = uncompressedSizeSmall == ZipHelper.Mask32Bit;
            bool compressedSizeInZip64   = compressedSizeSmall == ZipHelper.Mask32Bit;
            bool relativeOffsetInZip64   = relativeOffsetOfLocalHeaderSmall == ZipHelper.Mask32Bit;
            bool diskNumberStartInZip64  = diskNumberStartSmall == ZipHelper.Mask16Bit;

            Zip64ExtraField zip64;

            long endExtraFields = reader.BaseStream.Position + header.ExtraFieldLength;

            using (Stream str = new SubReadStream(reader.BaseStream, reader.BaseStream.Position, header.ExtraFieldLength))
            {
                if (saveExtraFieldsAndComments)
                {
                    header.ExtraFields = ZipGenericExtraField.ParseExtraField(str);
                    zip64 = Zip64ExtraField.GetAndRemoveZip64Block(header.ExtraFields,
                                                                   uncompressedSizeInZip64, compressedSizeInZip64,
                                                                   relativeOffsetInZip64, diskNumberStartInZip64);
                }
                else
                {
                    header.ExtraFields = null;
                    zip64 = Zip64ExtraField.GetJustZip64Block(str,
                                                              uncompressedSizeInZip64, compressedSizeInZip64,
                                                              relativeOffsetInZip64, diskNumberStartInZip64);
                }
            }

            // There are zip files that have malformed ExtraField blocks in which GetJustZip64Block() silently bails out without reading all the way to the end
            // of the ExtraField block. Thus we must force the stream's position to the proper place.
            reader.BaseStream.AdvanceToPosition(endExtraFields);

            if (saveExtraFieldsAndComments)
            {
                header.FileComment = reader.ReadBytes(header.FileCommentLength);
            }
            else
            {
                reader.BaseStream.Position += header.FileCommentLength;
                header.FileComment          = null;
            }

            header.UncompressedSize = zip64.UncompressedSize == null
                                                    ? uncompressedSizeSmall
                                                    : zip64.UncompressedSize.Value;
            header.CompressedSize = zip64.CompressedSize == null
                                                    ? compressedSizeSmall
                                                    : zip64.CompressedSize.Value;
            header.RelativeOffsetOfLocalHeader = zip64.LocalHeaderOffset == null
                                                    ? relativeOffsetOfLocalHeaderSmall
                                                    : zip64.LocalHeaderOffset.Value;
            header.DiskNumberStart = zip64.StartDiskNumber == null
                                                    ? diskNumberStartSmall
                                                    : zip64.StartDiskNumber.Value;

            return(true);
        }