public static List <ZipGenericExtraField> GetExtraFields(BinaryReader reader)
{
List <ZipGenericExtraField> list;
reader.BaseStream.Seek(0x1aL, SeekOrigin.Current);
ushort num = reader.ReadUInt16();
ushort num2 = reader.ReadUInt16();
reader.BaseStream.Seek((long)num, SeekOrigin.Current);
using (Stream stream = new SubReadStream(reader.BaseStream, reader.BaseStream.Position, (long)num2))
{
list = ZipGenericExtraField.ParseExtraField(stream);
}
Zip64ExtraField.RemoveZip64Blocks(list);
return(list);
}
public static bool TryReadBlock(BinaryReader reader, bool saveExtraFieldsAndComments, out ZipCentralDirectoryFileHeader header)
{
Zip64ExtraField field;
header = new ZipCentralDirectoryFileHeader();
if (reader.ReadUInt32() != 0x2014b50)
{
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 num = 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(header.FilenameLength);
bool readUncompressedSize = num2 == uint.MaxValue;
bool readCompressedSize = num == uint.MaxValue;
bool readLocalHeaderOffset = num4 == uint.MaxValue;
bool readStartDiskNumber = num3 == 0xffff;
long position = reader.BaseStream.Position + header.ExtraFieldLength;
using (Stream stream = new SubReadStream(reader.BaseStream, reader.BaseStream.Position, (long)header.ExtraFieldLength))
{
if (saveExtraFieldsAndComments)
{
header.ExtraFields = ZipGenericExtraField.ParseExtraField(stream);
field = Zip64ExtraField.GetAndRemoveZip64Block(header.ExtraFields, readUncompressedSize, readCompressedSize, readLocalHeaderOffset, readStartDiskNumber);
}
else
{
header.ExtraFields = null;
field = Zip64ExtraField.GetJustZip64Block(stream, readUncompressedSize, readCompressedSize, readLocalHeaderOffset, readStartDiskNumber);
}
}
reader.BaseStream.AdvanceToPosition(position);
if (saveExtraFieldsAndComments)
{
header.FileComment = reader.ReadBytes(header.FileCommentLength);
}
else
{
Stream baseStream = reader.BaseStream;
baseStream.Position += header.FileCommentLength;
header.FileComment = null;
}
header.UncompressedSize = !field.UncompressedSize.HasValue ? ((long)num2) : field.UncompressedSize.Value;
header.CompressedSize = !field.CompressedSize.HasValue ? ((long)num) : field.CompressedSize.Value;
header.RelativeOffsetOfLocalHeader = !field.LocalHeaderOffset.HasValue ? ((long)num4) : field.LocalHeaderOffset.Value;
header.DiskNumberStart = !field.StartDiskNumber.HasValue ? num3 : field.StartDiskNumber.Value;
return(true);
}
