diff options
Diffstat (limited to 'kernel/kls_ljpeg/ljpeg2ppm/ljpgtopnm.c')
| -rw-r--r-- | kernel/kls_ljpeg/ljpeg2ppm/ljpgtopnm.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/kernel/kls_ljpeg/ljpeg2ppm/ljpgtopnm.c b/kernel/kls_ljpeg/ljpeg2ppm/ljpgtopnm.c new file mode 100644 index 0000000..c975892 --- /dev/null +++ b/kernel/kls_ljpeg/ljpeg2ppm/ljpgtopnm.c @@ -0,0 +1,263 @@ +/* + * 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; +} |