public void StartDecoder(uint offset, uint size)
{
if (!input.IsValid(offset, size))
{
throw new RawDecoderException("Start offset plus size is longer than file. Truncated file.");
}
if ((int)offX >= raw.fullSize.dim.width)
{
throw new RawDecoderException("X offset outside of image");
}
if ((int)offY >= raw.fullSize.dim.height)
{
throw new RawDecoderException("Y offset outside of image");
}
// JPEG is big endian
if (Common.GetHostEndianness() == Endianness.Big)
{
input = new ImageBinaryReader(input.BaseStream, offset);
}
else
{
input = new ImageBinaryReaderBigEndian(input.BaseStream, offset);
}
if (GetNextMarker(false) != JpegMarker.SOI)
{
throw new RawDecoderException("Image did not start with SOI. Probably not an LJPEG");
}
bool moreImage = true;
while (moreImage)
{
JpegMarker m = GetNextMarker(true);
switch (m)
{
case JpegMarker.DQT:
throw new RawDecoderException("Not a valid RAW file.");
case JpegMarker.DHT:
// _RPT0(0,"Found DHT marker\n");
ParseDHT();
break;
case JpegMarker.SOS:
// _RPT0(0,"Found SOS marker\n");
ParseSOS();
break;
case JpegMarker.Sof3:
// _RPT0(0,"Found SOF 3 marker:\n");
ParseSOF(frame);
break;
case JpegMarker.EOI:
// _RPT0(0,"Found EOI marker\n");
moreImage = false;
break;
case JpegMarker.DRI: // _RPT0(0,"Found DRI marker\n");
case JpegMarker.App0: // _RPT0(0,"Found APP0 marker\n");
default: // _RPT1(0, "Found marker:0x%x. Skipping\n", m);
// Just let it skip to next marker
break;
}
}
}