int process_segment(void)
{
word marker;
int err;
marker = fetch_word();
if (marker == 0xFFD9)
{
iceenv.eoi = 1;
#ifdef _JPEG_DEBUG
printf("EOI detected! Done.\n");
#endif
return ERR_OK;
}
iceenv.cur_segment_len = fetch_word();
switch (marker)
{
case 0xFFE0:
err = process_app0();
break;
case 0xFFDB:
err = process_dqt();
break;
case 0xFFC0:
err = process_sof0();
break;
case 0xFFC4:
err = process_dht();
break;
case 0xFFDD:
err = process_dri();
break;
case 0xFFDA:
err = gen_huffman_tables();
err = process_sos();
err = decode_scan();
err = upsample();
err = create_image();
break;
case 0xFFC1:
case 0xFFC2:
case 0xFFC3:
case 0xFFC5:
case 0xFFC6:
case 0xFFC7:
case 0xFFC9:
case 0xFFCA:
case 0xFFCB:
case 0xFFCD:
case 0xFFCE:
case 0xFFCF:
err = ERR_NOT_BASELINE;
break;
default:
#ifdef _JPEG_DEBUG
printf("Skipping unknown segment %X\n", marker & 0xFF);
#endif
iceenv.buf_pos += iceenv.cur_segment_len - 2;
err = ERR_OK;
break;
}
return err;
}
JPEGLoader::JPEGLoader(const IODevicePtr &iodevice)
: progressive(false), scan_count(0), mcu_x(0), mcu_y(0), mcu_width(0), mcu_height(0), restart_interval(0), eobrun(0), is_jfif_jpeg(false), is_adobe_jpeg(false), adobe_app14_transform(1)
{
JPEGFileReader reader(iodevice);
JPEGMarker marker = reader.read_marker();
if (marker != marker_soi)
throw Exception("Not a JPEG file");
marker = reader.read_marker();
while (marker != marker_eoi)
{
if (marker == marker_app0)
{
process_app0(reader);
}
else if (marker == marker_app14)
{
process_app14(reader);
}
else if ((marker >= marker_sof0 && marker <= marker_sof3) || (marker >= marker_sof5 && marker <= marker_sof15))
{
process_sof(marker, reader);
}
else if (marker == marker_dht)
{
process_dht(reader);
}
else if (marker == marker_dqt)
{
process_dqt(reader);
}
else if (marker == marker_dri)
{
restart_interval = reader.read_dri();
}
else if (marker == marker_sos)
{
/*try
{*/
process_sos(reader);
/*}
catch (...)
{
char buffer[16*1024];
while (reader.read_entropy_data(buffer, 16*1024) != 0);
}*/
}
else if (marker == marker_dnl)
{
process_dnl(reader);
}
else
{
reader.skip_unknown();
}
marker = reader.read_marker();
}
if (scan_count == 0 || start_of_frame.height == 0)
throw Exception("Invalid JPEG Image");
}