PUBLIC JPEG_RET_E ParseHead(JPEG_DEC_INPUT_PARA_T *jpeg_dec_input)
{
uint32 c = 0;
/* Expect an SOI marker first */
while(1)/*lint !e716*/
{
if ((!GetNextMarker(&c)) || (c == M_EOI) )
{
JPEG_TRACE("[JPEG_HWParseHead] find the SOI marker error: %x", c);
return JPEG_FAILED;
}
if(c == M_SOI)
{
break;
}
}
/* Process markers until SOF */
c = ProcessTables(jpeg_dec_input);
switch (c)
{
case M_ERROR:
return JPEG_FAILED;
case M_SOS:
if(GetSOS() != JPEG_SUCCESS)
{
return JPEG_FAILED;
}
break;
case M_EOI:
return JPEG_FAILED;
default:
return JPEG_FAILED;
}
return JPEG_SUCCESS;
}
/*
*--------------------------------------------------------------
*
* ReadFileHeader --
*
* Initialize and read the file header (everything through
* the SOF marker).
*
* Results:
* None
*
* Side effects:
* Exit on error.
*
*--------------------------------------------------------------
*/
void ReadFileHeader (DecompressInfo *dcPtr)
{
int c, c2;
/*
* Demand an SOI marker at the start of the file --- otherwise it's
* probably not a JPEG file at all.
*/
c = GetJpegChar();
c2 = GetJpegChar();
if ((c != 0xFF) || (c2 != M_SOI)) {
if( c == EOF ) {
fprintf(stderr, "Reached end of input file. All done!\n");
/* fclose(outFile); */
/* exit(1); */
dcPtr->error = -1; return;
} else {
fprintf (stderr, "Not a JPEG file. Found %02X %02X\n", c, c2);
/* exit (1); */
dcPtr->error = -1; return;
}
}/*endif*/
GetSoi (dcPtr); if (dcPtr->error) return; /* OK, process SOI */
/*
* Process markers until SOF
*/
c = ProcessTables (dcPtr); if (dcPtr->error) return;
switch (c) {
case M_SOF0:
case M_SOF1:
case M_SOF3:
GetSof (dcPtr, c);
break;
default:
fprintf (stderr, "Unsupported SOF marker type 0x%02x\n", c);
break;
}
}/*endof ReadFileHeader*/
/*
*--------------------------------------------------------------
*
* ReadScanHeader --
*
* Read the start of a scan (everything through the SOS marker).
*
* Results:
* 1 if find SOS, 0 if find EOI
*
* Side effects:
* Bitstream is parsed, may exit on errors.
*
*--------------------------------------------------------------
*/
int ReadScanHeader (DecompressInfo *dcPtr)
{
int c;
/*
* Process markers until SOS or EOI
*/
c = ProcessTables (dcPtr); if (dcPtr->error) return 0;
switch (c) {
case M_SOS:
GetSos (dcPtr);
return 1;
case M_EOI:
return 0;
default:
fprintf (stderr, "Unexpected marker 0x%02x\n", c);
break;
}
return 0;
}/*endof ReadScanHeader*/
