} // 'GGPF'
public override ImageMetaData ReadMetaData(Stream stream)
{
var header = new byte[0x24];
if (header.Length != stream.Read(header, 0, header.Length))
{
return(null);
}
if (!Binary.AsciiEqual(header, 0, "GGPFAIKE"))
{
return(null);
}
var info = new GgpMetaData
{
Offset = LittleEndian.ToUInt32(header, 0x14),
Length = LittleEndian.ToUInt32(header, 0x18),
};
for (int i = 0; i < 8; ++i)
{
info.Key[i] = (byte)(header[i] ^ header[i + 0xC]);
}
stream.Position = info.Offset;
using (var png = new EncryptedStream(stream, info.Key, true))
{
var png_info = base.ReadMetaData(png);
info.Width = png_info.Width;
info.Height = png_info.Height;
info.BPP = png_info.BPP;
info.OffsetX = png_info.OffsetX;
info.OffsetY = png_info.OffsetY;
return(info);
}
}
public override ImageMetaData ReadMetaData(IBinaryStream stream)
{
var header = stream.ReadHeader(0x24);
if (!header.AsciiEqual("GGPFAIKE"))
{
return(null);
}
var info = new GgpMetaData
{
Offset = header.ToUInt32(0x14),
Length = header.ToUInt32(0x18),
};
for (int i = 0; i < 8; ++i)
{
info.Key[i] = (byte)(header[i] ^ header[i + 0xC]);
}
stream.Position = info.Offset;
using (var enc = new EncryptedStream(stream.AsStream, info.Key, true))
using (var png = new BinaryStream(enc, stream.Name))
{
var png_info = base.ReadMetaData(png);
info.Width = png_info.Width;
info.Height = png_info.Height;
info.BPP = png_info.BPP;
info.OffsetX = png_info.OffsetX;
info.OffsetY = png_info.OffsetY;
return(info);
}
}
public override ImageData Read(IBinaryStream file, ImageMetaData info)
{
var meta = (GgpMetaData)info;
using (var input = new StreamRegion(file.AsStream, meta.Offset, meta.Length, true))
using (var enc = new EncryptedStream(input, meta.Key))
using (var png = new BinaryStream(enc, file.Name))
return(base.Read(png, info));
}
public override ImageData Read(Stream file, ImageMetaData info)
{
var meta = info as GgpMetaData;
if (null == meta)
{
throw new ArgumentException("GgpFormat.Read should be supplied with GgpMetaData", "info");
}
using (var input = new StreamRegion(file, meta.Offset, meta.Length, true))
using (var png = new EncryptedStream(input, meta.Key, true))
return(base.Read(png, info));
}
