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using System;
using System.IO;
using Org.BouncyCastle.Bcpg.Attr;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Bcpg
{
/**
* reader for user attribute sub-packets
*/
public class UserAttributeSubpacketsParser
{
private readonly Stream input;
public UserAttributeSubpacketsParser(
Stream input)
{
this.input = input;
}
public UserAttributeSubpacket ReadPacket()
{
int l = input.ReadByte();
if (l < 0)
return null;
int bodyLen = 0;
if (l < 192)
{
bodyLen = l;
}
else if (l <= 223)
{
bodyLen = ((l - 192) << 8) + (input.ReadByte()) + 192;
}
else if (l == 255)
{
bodyLen = (input.ReadByte() << 24) | (input.ReadByte() << 16)
| (input.ReadByte() << 8) | input.ReadByte();
}
else
{
// TODO Error?
}
int tag = input.ReadByte();
if (tag < 0)
throw new EndOfStreamException("unexpected EOF reading user attribute sub packet");
byte[] data = new byte[bodyLen - 1];
if (Streams.ReadFully(input, data) < data.Length)
throw new EndOfStreamException();
UserAttributeSubpacketTag type = (UserAttributeSubpacketTag) tag;
switch (type)
{
case UserAttributeSubpacketTag.ImageAttribute:
return new ImageAttrib(data);
}
return new UserAttributeSubpacket(type, data);
}
}
}
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