internal EriReader ReadImageData(IBinaryStream stream, EriMetaData meta)
{
stream.Position = meta.StreamPos;
Color[] palette = null;
using (var input = new EriFile(stream.AsStream))
{
for (;;) // ReadSection throws an exception in case of EOF
{
var section = input.ReadSection();
if ("Stream " == section.Id)
{
continue;
}
if ("ImageFrm" == section.Id)
{
break;
}
if ("Palette " == section.Id && meta.BPP <= 8 && section.Length <= 0x400)
{
palette = ReadPalette(stream.AsStream, (int)section.Length);
continue;
}
input.BaseStream.Seek(section.Length, SeekOrigin.Current);
}
}
var reader = new EriReader(stream.AsStream, meta, palette);
reader.DecodeImage();
if (!string.IsNullOrEmpty(meta.Description))
{
var tags = ParseTagInfo(meta.Description);
string ref_file;
if (tags.TryGetValue("reference-file", out ref_file))
{
ref_file = ref_file.TrimEnd(null);
if (!string.IsNullOrEmpty(ref_file))
{
if ((meta.BPP + 7) / 8 < 3)
{
throw new InvalidFormatException();
}
ref_file = VFS.CombinePath(VFS.GetDirectoryName(meta.FileName), ref_file);
using (var ref_src = VFS.OpenBinaryStream(ref_file))
{
var ref_info = ReadMetaData(ref_src) as EriMetaData;
if (null == ref_info)
{
throw new FileNotFoundException("Referenced image not found", ref_file);
}
ref_info.FileName = ref_file;
var ref_reader = ReadImageData(ref_src, ref_info);
reader.AddImageBuffer(ref_reader);
}
}
}
}
return(reader);
}
public byte[] GetFrame(int index)
{
if (index >= Frames.Length)
{
throw new ArgumentException("index");
}
if (null != Frames[index])
{
return(Frames[index]);
}
var entry = Dir.ElementAt(index) as EriEntry;
byte[] prev_frame = null;
if (index > 0 && entry.IsDiff)
{
prev_frame = GetFrame(index - 1);
}
using (var stream = File.CreateStream(entry.Offset, entry.Size))
{
var reader = new EriReader(stream, Info, Palette, prev_frame);
reader.DecodeImage();
Frames[index] = reader.Data;
}
return(Frames[index]);
}
