public void Read(BinaryReader br)
{
for (;;)
{
HeaderProperty hp = (HeaderProperty)br.ReadByte();
switch (hp)
{
case HeaderProperty.kMainStreamsInfo:
StreamsInfo = new StreamsInfo();
StreamsInfo.Read(br);
break;
case HeaderProperty.kFilesInfo:
FileInfo = new FileInfo();
FileInfo.Read(br);
break;
case HeaderProperty.kEnd:
return;
default:
throw new Exception(hp.ToString());
}
}
}
public static ZipReturn ReadHeaderOrPackedHeader(Stream stream, long baseOffset, out Header header)
{
header = null;
using (BinaryReader br = new BinaryReader(stream, Encoding.UTF8, true))
{
HeaderProperty hp = (HeaderProperty)br.ReadByte();
switch (hp)
{
case HeaderProperty.kEncodedHeader:
{
StreamsInfo streamsInfo = new StreamsInfo();
streamsInfo.Read(br);
if (streamsInfo.Folders.Length > 1)
{
return(ZipReturn.ZipUnsupportedCompression);
}
Folder firstFolder = streamsInfo.Folders[0];
if (firstFolder.Coders.Length > 1)
{
return(ZipReturn.ZipUnsupportedCompression);
}
byte[] method = firstFolder.Coders[0].Method;
if (!((method.Length == 3) && (method[0] == 3) && (method[1] == 1) && (method[2] == 1))) // LZMA
{
return(ZipReturn.ZipUnsupportedCompression);
}
stream.Seek(baseOffset + (long)streamsInfo.PackPosition, SeekOrigin.Begin);
using (LzmaStream decoder = new LzmaStream(firstFolder.Coders[0].Properties, stream))
{
ZipReturn zr = ReadHeaderOrPackedHeader(decoder, baseOffset, out header);
if (zr != ZipReturn.ZipGood)
{
return(zr);
}
}
return(ZipReturn.ZipGood);
}
case HeaderProperty.kHeader:
{
header = new Header();
header.Read(br);
return(ZipReturn.ZipGood);
}
}
return(ZipReturn.ZipCentralDirError);
}
}