private static ExtraFieldBase GetExtraField(
FileHeaderInfoBase headerInfo,
BinaryReader reader)
{
ushort num1 = reader.ReadUInt16();
ExtraFieldType extraFieldType = ExtraFieldBase.GetExtraFieldType(num1);
ushort num2 = reader.ReadUInt16();
byte[] extraData = reader.ReadBytes((int)num2);
ExtraFieldBase extraFieldBase;
switch (extraFieldType)
{
case ExtraFieldType.Zip64:
extraFieldBase = (ExtraFieldBase) new Zip64ExtraField(headerInfo);
break;
case ExtraFieldType.AesEncryption:
extraFieldBase = (ExtraFieldBase) new AesEncryptionExtraField();
break;
default:
extraFieldBase = (ExtraFieldBase) new UnknownExtraField(num1);
break;
}
extraFieldBase.ParseBlock(extraData);
return(extraFieldBase);
}
public static IEnumerable <ExtraFieldBase> GetExtraFields(
FileHeaderInfoBase headerInfo)
{
MemoryStream stream = new MemoryStream(headerInfo.ExtraFieldsData);
using (BinaryReader reader = new BinaryReader((Stream)stream))
{
while (stream.Position < stream.Length)
{
ExtraFieldBase field = ExtraFieldBase.GetExtraField(headerInfo, reader);
yield return(field);
}
}
}
protected override void WriteFields(BinaryWriter writer)
{
writer.Write(this.VersionNeededToExtract);
writer.Write(this.GeneralPurposeBitFlag);
writer.Write(this.CompressionMethod);
writer.Write(this.FileTime);
base.WriteFields(writer);
writer.Write((ushort)this.FileName.Length);
if (this.ExtraFields != null)
{
this.ExtraFieldsData = ExtraFieldBase.GetExtraFieldsData((IEnumerable <ExtraFieldBase>) this.ExtraFields);
writer.Write((ushort)this.ExtraFieldsData.Length);
}
else
{
writer.Write((ushort)0);
}
}
internal void FromFileHeader(FileHeaderBase fileHeader)
{
this.CompressedSize = fileHeader.CompressedSize;
this.CompressionMethod = fileHeader.CompressionMethod;
this.UncompressedSize = fileHeader.UncompressedSize;
this.Crc = fileHeader.Crc;
if (fileHeader.ExtraFieldsData != null)
{
this.ExtraFieldsData = new byte[fileHeader.ExtraFieldsData.Length];
Array.Copy((Array)fileHeader.ExtraFieldsData, (Array)this.ExtraFieldsData, fileHeader.ExtraFieldsData.Length);
this.ExtraFields = new List <ExtraFieldBase>(ExtraFieldBase.GetExtraFields(this.GetHeaderInfo()));
}
if (fileHeader.FileName != null)
{
this.FileName = new byte[fileHeader.FileName.Length];
Array.Copy((Array)fileHeader.FileName, (Array)this.FileName, fileHeader.FileName.Length);
}
this.FileTime = fileHeader.FileTime;
this.GeneralPurposeBitFlag = fileHeader.GeneralPurposeBitFlag;
this.VersionNeededToExtract = fileHeader.VersionNeededToExtract;
}
protected void ReadExtraData(BinaryReader reader)
{
this.FileName = reader.ReadBytes((int)this.fileNameLength);
this.ExtraFieldsData = reader.ReadBytes((int)this.extraFieldLength);
this.ExtraFields = new List <ExtraFieldBase>(ExtraFieldBase.GetExtraFields(this.GetHeaderInfo()));
}