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/*
* ljpgtopnm.c --
*
* This is the main routine for the lossless JPEG decoder. Large
* parts are stolen from the IJG code, so:
*
* Copyright (C) 1991, 1992, Thomas G. Lane.
* Part of the Independent JPEG Group's software.
* See the file Copyright for more details.
*
* Copyright (c) 1993 Brian C. Smith, The Regents of the University
* of California
* All rights reserved.
*
* Copyright (c) 1994 Kongji Huang and Brian C. Smith.
* Cornell University
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement is
* hereby granted, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* IN NO EVENT SHALL CORNELL UNIVERSITY BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF CORNELL
* UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* CORNELL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND CORNELL UNIVERSITY HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <string.h>
#include "jpeg.h"
#include "mcu.h"
#include "proto.h"
/*
* input and output file pointers
*/
FILE *inFile, *outFile;
void FreeArray2D(char **);
void WritePmHeader(DecompressInfo dcInfo);
/*
*--------------------------------------------------------------
*
* ReadJpegData --
*
* This is an interface routine to the JPEG library. The
* JPEG library calls this routine to "get more data"
*
* Results:
* Number of bytes actually returned.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
int
ReadJpegData (buffer, numBytes)
char *buffer; /* Place to put new data */
int numBytes; /* Number of bytes to put */
{
return fread(buffer, 1, numBytes, inFile);
}
/*
*--------------------------------------------------------------
*
* WritePmHeader --
*
* Output Portable Pixmap (PPM) or Portable
* Graymap (PGM) image header.
*
* Results:
* None.
*
* Side effects:
* The PPM or PGM header is written to file
* pointed by outFile.
*
*--------------------------------------------------------------
*/
void
WritePmHeader(dcInfo)
DecompressInfo dcInfo;
{
switch(dcInfo.numComponents) {
case 1: /* pgm */
if (dcInfo.dataPrecision==8) {
fprintf(outFile,"P5\n%d %d\n255\n",
dcInfo.imageWidth,dcInfo.imageHeight);
} else {
fprintf(outFile,"P5\n%d %d\n%d\n",
dcInfo.imageWidth,dcInfo.imageHeight,
((1<<dcInfo.dataPrecision)-1));
}
break;
case 3: /* ppm */
if (dcInfo.dataPrecision==8) {
fprintf(outFile,"P6\n%d %d\n255\n",
dcInfo.imageWidth,dcInfo.imageHeight);
} else {
fprintf(outFile,"P6\n%d %d\n%d\n",
dcInfo.imageWidth,dcInfo.imageHeight,
((1<<dcInfo.dataPrecision)-1));
}
break;
default:
fprintf(stderr,"Error: Unsupported image format.\n");
exit(-1);
}
}
/*
*--------------------------------------------------------------
*
* ArgParser --
*
* Command line parser.
*
* Results:
* Command line parameters and options are passed out.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static void
ArgParser(argc,argv,verbose,linFile,loutFile)
int argc;
char **argv;
int *verbose;
FILE **linFile, **loutFile;
{
int argn;
char *arg;
const char *usage="ppmtoljpeg [ -v -h ] [ inFile [outFile] ]";
int NumOfFile=0;
/*
* default values
*/
*linFile=stdin;
*loutFile=stdout;
*verbose=0;
for (argn = 1; argn < argc; argn++) {
arg=argv[argn];
if (*arg != '-') { /* process a file name */
if (NumOfFile==0) {
if ((*linFile=fopen(arg,"r"))==NULL) {
fprintf(stderr,"Can't open %s\n",arg);
exit(-1);
}
}
if (NumOfFile==1) {
if ((*loutFile=fopen(arg,"w"))==NULL) {
fprintf(stderr,"Can't open %s\n",arg);
exit(-1);
}
}
if (NumOfFile>1) {
fprintf(stderr,"%s\n",usage);
exit(-1);
}
NumOfFile++;
}
else { /* precess a option */
arg++;
switch (*arg) {
case 'h':
/* help flag */
fprintf(stderr,"Decode a lossless JPEG image into ");
fprintf(stderr,"a PPM or PGM image.\n");
fprintf(stderr,"Usage:\n");
fprintf(stderr,"%s\n",usage);
fprintf(stderr,"Default input: stdin\n");
fprintf(stderr,"Default output: stdout\n");
fprintf(stderr,"-h help\n");
fprintf(stderr,"-v verbose\n");
exit(1);
break;
case 'v':
/* verbose flag */
*verbose=1;
break;
default:
fprintf(stderr,"%s\n",usage);
exit(-1);
}
}
}
}
int
main(argc, argv)
int argc;
char **argv;
{
DecompressInfo dcInfo;
int verbose;
/*
* Process command line parameters.
*/
MEMSET(&dcInfo, 0, sizeof(dcInfo));
ArgParser(argc,argv,&verbose,&inFile,&outFile);
/*
* Read the JPEG File header, up to scan header, and initialize all
* the variables in the decompression information structure.
*/
ReadFileHeader (&dcInfo);
/*
* Loop through each scan in image. ReadScanHeader returns
* 0 once it consumes and EOI marker.
*/
if (!ReadScanHeader (&dcInfo)) {
fprintf (stderr, "Empty JPEG file\n");
exit (1);
}
/*
* Output image parameter if verbose flag is on.
*/
if (verbose) {
fprintf(stderr,"sample precision=%d\n",dcInfo.dataPrecision);
fprintf(stderr,"image height=%d\n",dcInfo.imageHeight);
fprintf(stderr,"image width=%d\n",dcInfo.imageWidth);
fprintf(stderr,"component=%d\n",dcInfo.numComponents);
}
/*
* Write PPM or PGM image header. Decode the image bits
* stream. Clean up everything when finished decoding.
*/
WritePmHeader(dcInfo);
DecoderStructInit(&dcInfo);
HuffDecoderInit(&dcInfo);
DecodeImage(&dcInfo);
FreeArray2D(mcuROW1);
FreeArray2D(mcuROW2);
if (ReadScanHeader (&dcInfo)) {
fprintf (stderr, "Warning: multiple scans detected in JPEG file\n");
fprintf (stderr, " not currently supported\n");
fprintf (stderr, " ignoring extra scans\n");
}
return 0;
}
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