public static GetAndRemoveZip64Block ( List |
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extraFields | List |
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readUncompressedSize | bool | |
readCompressedSize | bool | |
readLocalHeaderOffset | bool | |
readStartDiskNumber | bool | |
Результат |
public static bool TryReadBlock(BinaryReader reader, bool saveExtraFieldsAndComments, out ZipCentralDirectoryFileHeader header) { Zip64ExtraField justZip64Block; long? uncompressedSize; long value; long num; long value1; header = new ZipCentralDirectoryFileHeader(); if (reader.ReadUInt32() != 33639248) { return(false); } header.VersionMadeBy = reader.ReadUInt16(); header.VersionNeededToExtract = reader.ReadUInt16(); header.GeneralPurposeBitFlag = reader.ReadUInt16(); header.CompressionMethod = reader.ReadUInt16(); header.LastModified = reader.ReadUInt32(); header.Crc32 = reader.ReadUInt32(); uint num1 = reader.ReadUInt32(); uint num2 = reader.ReadUInt32(); header.FilenameLength = reader.ReadUInt16(); header.ExtraFieldLength = reader.ReadUInt16(); header.FileCommentLength = reader.ReadUInt16(); ushort num3 = reader.ReadUInt16(); header.InternalFileAttributes = reader.ReadUInt16(); header.ExternalFileAttributes = reader.ReadUInt32(); uint num4 = reader.ReadUInt32(); header.Filename = reader.ReadBytes((int)header.FilenameLength); bool flag = num2 == -1; bool flag1 = num1 == -1; bool flag2 = num4 == -1; bool flag3 = num3 == 65535; long position = (long)(reader.BaseStream.Position + (ulong)header.ExtraFieldLength); using (Stream subReadStream = new SubReadStream(reader.BaseStream, reader.BaseStream.Position, (long)header.ExtraFieldLength)) { if (!saveExtraFieldsAndComments) { header.ExtraFields = null; justZip64Block = Zip64ExtraField.GetJustZip64Block(subReadStream, flag, flag1, flag2, flag3); } else { header.ExtraFields = ZipGenericExtraField.ParseExtraField(subReadStream); justZip64Block = Zip64ExtraField.GetAndRemoveZip64Block(header.ExtraFields, flag, flag1, flag2, flag3); } } reader.BaseStream.AdvanceToPosition(position); if (!saveExtraFieldsAndComments) { Stream baseStream = reader.BaseStream; baseStream.Position = (long)(baseStream.Position + (ulong)header.FileCommentLength); header.FileComment = null; } else { header.FileComment = reader.ReadBytes((int)header.FileCommentLength); } if (!justZip64Block.UncompressedSize.HasValue) { value = (long)((ulong)num2); } else { uncompressedSize = justZip64Block.UncompressedSize; value = uncompressedSize.Value; } header.UncompressedSize = value; if (!justZip64Block.CompressedSize.HasValue) { num = (long)((ulong)num1); } else { uncompressedSize = justZip64Block.CompressedSize; num = uncompressedSize.Value; } header.CompressedSize = num; if (!justZip64Block.LocalHeaderOffset.HasValue) { value1 = (long)((ulong)num4); } else { uncompressedSize = justZip64Block.LocalHeaderOffset; value1 = uncompressedSize.Value; } header.RelativeOffsetOfLocalHeader = value1; header.DiskNumberStart = (!justZip64Block.StartDiskNumber.HasValue ? (int)num3 : justZip64Block.StartDiskNumber.Value); return(true); }
// 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); }
//if saveExtraFieldsAndComments is false, FileComment and ExtraFields will be null //in either case, the zip64 extra field info will be incorporated into other fields static public Boolean TryReadBlock(BinaryReader reader, Boolean saveExtraFieldsAndComments, out ZipCentralDirectoryFileHeader header) { header = new ZipCentralDirectoryFileHeader(); if (reader.ReadUInt32() != SignatureConstant) { return(false); } header.VersionMadeBy = reader.ReadUInt16(); header.VersionNeededToExtract = reader.ReadUInt16(); header.GeneralPurposeBitFlag = reader.ReadUInt16(); header.CompressionMethod = reader.ReadUInt16(); header.LastModified = reader.ReadUInt32(); header.Crc32 = reader.ReadUInt32(); UInt32 compressedSizeSmall = reader.ReadUInt32(); UInt32 uncompressedSizeSmall = reader.ReadUInt32(); header.FilenameLength = reader.ReadUInt16(); header.ExtraFieldLength = reader.ReadUInt16(); header.FileCommentLength = reader.ReadUInt16(); UInt16 diskNumberStartSmall = reader.ReadUInt16(); header.InternalFileAttributes = reader.ReadUInt16(); header.ExternalFileAttributes = reader.ReadUInt32(); UInt32 relativeOffsetOfLocalHeaderSmall = reader.ReadUInt32(); header.Filename = reader.ReadBytes(header.FilenameLength); Boolean uncompressedSizeInZip64 = uncompressedSizeSmall == ZipHelper.Mask32Bit; Boolean compressedSizeInZip64 = compressedSizeSmall == ZipHelper.Mask32Bit; Boolean relativeOffsetInZip64 = relativeOffsetOfLocalHeaderSmall == ZipHelper.Mask32Bit; Boolean diskNumberStartInZip64 = diskNumberStartSmall == ZipHelper.Mask16Bit; Zip64ExtraField zip64; 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); } } 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); }