public static List <ZipGenericExtraField> GetExtraFields(BinaryReader reader)
{
reader.BaseStream.Seek(26L, SeekOrigin.Current);
ushort num1 = reader.ReadUInt16();
ushort num2 = reader.ReadUInt16();
reader.BaseStream.Seek((long)num1, SeekOrigin.Current);
List <ZipGenericExtraField> extraFields;
using (Stream extraFieldData = (Stream) new SubReadStream(reader.BaseStream, reader.BaseStream.Position, (long)num2))
{
extraFields = ZipGenericExtraField.ParseExtraField(extraFieldData);
}
Zip64ExtraField.RemoveZip64Blocks(extraFields);
return(extraFields);
}
public static bool TryReadBlock(BinaryReader reader, bool saveExtraFieldsAndComments, out ZipCentralDirectoryFileHeader header)
{
header = new ZipCentralDirectoryFileHeader();
if (reader.ReadUInt32() != 33639248u)
{
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((int)header.FilenameLength);
bool readUncompressedSize = num2 == 4294967295u;
bool readCompressedSize = num == 4294967295u;
bool readLocalHeaderOffset = num4 == 4294967295u;
bool readStartDiskNumber = num3 == 65535;
long position = reader.BaseStream.Position + (long)((ulong)header.ExtraFieldLength);
Zip64ExtraField zip64ExtraField;
using (Stream stream = new SubReadStream(reader.BaseStream, reader.BaseStream.Position, (long)((ulong)header.ExtraFieldLength)))
{
if (saveExtraFieldsAndComments)
{
header.ExtraFields = ZipGenericExtraField.ParseExtraField(stream);
zip64ExtraField = Zip64ExtraField.GetAndRemoveZip64Block(header.ExtraFields, readUncompressedSize, readCompressedSize, readLocalHeaderOffset, readStartDiskNumber);
}
else
{
header.ExtraFields = null;
zip64ExtraField = Zip64ExtraField.GetJustZip64Block(stream, readUncompressedSize, readCompressedSize, readLocalHeaderOffset, readStartDiskNumber);
}
}
ZipHelper.AdvanceToPosition(reader.BaseStream, position);
if (saveExtraFieldsAndComments)
{
header.FileComment = reader.ReadBytes((int)header.FileCommentLength);
}
else
{
reader.BaseStream.Position += (long)((ulong)header.FileCommentLength);
header.FileComment = null;
}
header.UncompressedSize = (long)((!zip64ExtraField.UncompressedSize.HasValue) ? ((ulong)num2) : ((ulong)zip64ExtraField.UncompressedSize.Value));
header.CompressedSize = (long)((!zip64ExtraField.CompressedSize.HasValue) ? ((ulong)num) : ((ulong)zip64ExtraField.CompressedSize.Value));
header.RelativeOffsetOfLocalHeader = (long)((!zip64ExtraField.LocalHeaderOffset.HasValue) ? ((ulong)num4) : ((ulong)zip64ExtraField.LocalHeaderOffset.Value));
header.DiskNumberStart = ((!zip64ExtraField.StartDiskNumber.HasValue) ? ((int)num3) : zip64ExtraField.StartDiskNumber.Value);
return(true);
}
public static bool TryReadBlock(BinaryReader reader, bool saveExtraFieldsAndComments, out ZipCentralDirectoryFileHeader header)
{
header = new ZipCentralDirectoryFileHeader();
if ((int)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 readUncompressedSize = (int)num2 == -1;
bool readCompressedSize = (int)num1 == -1;
bool readLocalHeaderOffset = (int)num4 == -1;
bool readStartDiskNumber = (int)num3 == (int)ushort.MaxValue;
Zip64ExtraField zip64ExtraField;
using (Stream stream = (Stream) new SubReadStream(reader.BaseStream, reader.BaseStream.Position, (long)header.ExtraFieldLength))
{
if (saveExtraFieldsAndComments)
{
header.ExtraFields = ZipGenericExtraField.ParseExtraField(stream);
zip64ExtraField = Zip64ExtraField.GetAndRemoveZip64Block(header.ExtraFields, readUncompressedSize, readCompressedSize, readLocalHeaderOffset, readStartDiskNumber);
}
else
{
header.ExtraFields = (List <ZipGenericExtraField>)null;
zip64ExtraField = Zip64ExtraField.GetJustZip64Block(stream, readUncompressedSize, readCompressedSize, readLocalHeaderOffset, readStartDiskNumber);
}
}
if (saveExtraFieldsAndComments)
{
header.FileComment = reader.ReadBytes((int)header.FileCommentLength);
}
else
{
reader.BaseStream.Position += (long)header.FileCommentLength;
header.FileComment = (byte[])null;
}
header.UncompressedSize = !zip64ExtraField.UncompressedSize.HasValue ? (long)num2 : zip64ExtraField.UncompressedSize.Value;
header.CompressedSize = !zip64ExtraField.CompressedSize.HasValue ? (long)num1 : zip64ExtraField.CompressedSize.Value;
header.RelativeOffsetOfLocalHeader = !zip64ExtraField.LocalHeaderOffset.HasValue ? (long)num4 : zip64ExtraField.LocalHeaderOffset.Value;
header.DiskNumberStart = !zip64ExtraField.StartDiskNumber.HasValue ? (int)num3 : zip64ExtraField.StartDiskNumber.Value;
return(true);
}
