ImageAttrib
using System;
using System.IO;
namespace Org.BouncyCastle.Bcpg.Attr
{
public class ImageAttrib : UserAttributeSubpacket
{
public enum Format : byte
{
Jpeg = 1
}
private static readonly byte[] Zeroes = new byte[12];
private int hdrLength;
private int _version;
private int _encoding;
private byte[] imageData;
public virtual int Version => _version;
public virtual int Encoding => _encoding;
public ImageAttrib(byte[] data)
: this(false, data)
{
}
public ImageAttrib(bool forceLongLength, byte[] data)
: base(UserAttributeSubpacketTag.ImageAttribute, forceLongLength, data)
{
hdrLength = (((data[1] & 255) << 8) | (data[0] & 255));
_version = (data[2] & 255);
_encoding = (data[3] & 255);
imageData = new byte[data.Length - hdrLength];
Array.Copy(data, hdrLength, imageData, 0, imageData.Length);
}
public ImageAttrib(Format imageType, byte[] imageData)
: this(ToByteArray(imageType, imageData))
{
}
private static byte[] ToByteArray(Format imageType, byte[] imageData)
{
MemoryStream memoryStream = new MemoryStream();
memoryStream.WriteByte(16);
memoryStream.WriteByte(0);
memoryStream.WriteByte(1);
memoryStream.WriteByte((byte)imageType);
memoryStream.Write(Zeroes, 0, Zeroes.Length);
memoryStream.Write(imageData, 0, imageData.Length);
return memoryStream.ToArray();
}
public virtual byte[] GetImageData()
{
return imageData;
}
}
}