// Initialize the input controller module.
// This is called only once, when the decompression object is created.
public static void jinit_input_controller(jpeg_decompress cinfo)
{
my_input_controller inputctl = null;
// Create subobject in pool
try
{
inputctl = new my_input_controller();
}
catch
{
ERREXIT1(cinfo, J_MESSAGE_CODE.JERR_OUT_OF_MEMORY, 4);
}
cinfo.inputctl = inputctl;
// Initialize method pointers
inputctl.consume_input = consume_markers_d_input;
inputctl.reset_input_controller = reset_input_controller_d_input;
inputctl.start_input_pass = start_input_pass_d_input;
inputctl.finish_input_pass = finish_input_pass_d_input;
// Initialize state: can't use reset_input_controller since we don't
// want to try to reset other modules yet.
inputctl.has_multiple_scans = false; // "unknown" would be better
inputctl.eoi_reached = false;
inputctl.inheaders = 1;
}
// Reset state to begin a fresh datastream.
static void reset_input_controller_d_input(jpeg_decompress cinfo)
{
my_input_controller inputctl = (my_input_controller)cinfo.inputctl;
inputctl.consume_input = consume_markers_d_input;
inputctl.has_multiple_scans = false; // "unknown" would be better
inputctl.eoi_reached = false;
inputctl.inheaders = 1;
// Reset other modules
cinfo.err.reset_error_mgr(cinfo);
cinfo.marker.reset_marker_reader(cinfo);
// Reset progression state -- would be cleaner if entropy decoder did this
cinfo.coef_bits = null;
}
// Read JPEG markers before, between, or after compressed-data scans.
// Change state as necessary when a new scan is reached.
// Return value is JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
//
// The consume_input method pointer points either here or to the
// coefficient controller's consume_data routine, depending on whether
// we are reading a compressed data segment or inter-segment markers.
//
// Note: This function should NOT return a pseudo SOS marker (with zero
// component number) to the caller. A pseudo marker received by
// read_markers is processed and then skipped for other markers.
static CONSUME_INPUT consume_markers_d_input(jpeg_decompress cinfo)
{
my_input_controller inputctl = (my_input_controller)cinfo.inputctl;
if (inputctl.eoi_reached)
{
return(CONSUME_INPUT.JPEG_REACHED_EOI); // After hitting EOI, read no further
}
CONSUME_INPUT val = cinfo.marker.read_markers(cinfo);
for (; ;) // Loop to pass pseudo SOS marker
{
switch (val)
{
case CONSUME_INPUT.JPEG_REACHED_SOS: // Found SOS
if (inputctl.inheaders != 0)
{ // 1st SOS
if (inputctl.inheaders == 1)
{
initial_setup_d_input(cinfo);
// Initialize the decompression codec. We need to do this here so that
// any codec-specific fields and function pointers are available to
// the rest of the library.
jinit_d_codec(cinfo);
}
if (cinfo.comps_in_scan == 0) // pseudo SOS marker
{
inputctl.inheaders = 2;
break;
}
inputctl.inheaders = 0;
// Note: start_input_pass must be called by jdmaster.cs
// before any more input can be consumed. jdapimin.cs is
// responsible for enforcing this sequencing.
}
else
{ // 2nd or later SOS marker
if (!inputctl.has_multiple_scans)
{
ERREXIT(cinfo, J_MESSAGE_CODE.JERR_EOI_EXPECTED); // Oops, I wasn't expecting this!
}
if (cinfo.comps_in_scan == 0) // unexpected pseudo SOS marker
{
break;
}
start_input_pass_d_input(cinfo);
}
return(val);
case CONSUME_INPUT.JPEG_REACHED_EOI: // Found EOI
inputctl.eoi_reached = true;
if (inputctl.inheaders != 0)
{ // Tables-only datastream, apparently
if (cinfo.marker.saw_SOF)
{
ERREXIT(cinfo, J_MESSAGE_CODE.JERR_SOF_NO_SOS);
}
}
else
{
// Prevent infinite loop in coef ctlr's decompress_data routine
// if user set output_scan_number larger than number of scans.
if (cinfo.output_scan_number > cinfo.input_scan_number)
{
cinfo.output_scan_number = cinfo.input_scan_number;
}
}
return(val);
case CONSUME_INPUT.JPEG_SUSPENDED:
return(val);
}
}
}
// Initialize the input controller module.
// This is called only once, when the decompression object is created.
public static void jinit_input_controller(jpeg_decompress cinfo)
{
my_input_controller inputctl=null;
// Create subobject in pool
try
{
inputctl=new my_input_controller();
}
catch
{
ERREXIT1(cinfo, J_MESSAGE_CODE.JERR_OUT_OF_MEMORY, 4);
}
cinfo.inputctl=inputctl;
// Initialize method pointers
inputctl.consume_input=consume_markers_d_input;
inputctl.reset_input_controller=reset_input_controller_d_input;
inputctl.start_input_pass=start_input_pass_d_input;
inputctl.finish_input_pass=finish_input_pass_d_input;
// Initialize state: can't use reset_input_controller since we don't
// want to try to reset other modules yet.
inputctl.has_multiple_scans=false; // "unknown" would be better
inputctl.eoi_reached=false;
inputctl.inheaders=1;
}
