671242f350d172e106580348e24bab66b0d7e6a5vboxsync/*
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * pnm2png.c --- conversion from PBM/PGM/PPM-file to PNG-file
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * copyright (C) 1999 by Willem van Schaik <willem@schaik.com>
671242f350d172e106580348e24bab66b0d7e6a5vboxsync *
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * version 1.0 - 1999.10.15 - First version.
671242f350d172e106580348e24bab66b0d7e6a5vboxsync *
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * Permission to use, copy, modify, and distribute this software and
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * its documentation for any purpose and without fee is hereby granted,
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * provided that the above copyright notice appear in all copies and
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * that both that copyright notice and this permission notice appear in
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * supporting documentation. This software is provided "as is" without
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * express or implied warranty.
671242f350d172e106580348e24bab66b0d7e6a5vboxsync */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#include <stdio.h>
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#include <stdlib.h>
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#ifdef __TURBOC__
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#include <mem.h>
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#include <fcntl.h>
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#endif
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#ifndef BOOL
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#define BOOL unsigned char
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#endif
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#ifndef TRUE
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#define TRUE (BOOL) 1
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#endif
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#ifndef FALSE
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#define FALSE (BOOL) 0
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#endif
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#define STDIN 0
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#define STDOUT 1
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#define STDERR 2
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync/* to make pnm2png verbose so we can find problems (needs to be before png.h) */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#ifndef PNG_DEBUG
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#define PNG_DEBUG 0
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#endif
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#include "png.h"
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#ifndef png_jmpbuf
671242f350d172e106580348e24bab66b0d7e6a5vboxsync# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#endif
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync/* function prototypes */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsyncint main (int argc, char *argv[]);
671242f350d172e106580348e24bab66b0d7e6a5vboxsyncvoid usage ();
671242f350d172e106580348e24bab66b0d7e6a5vboxsyncBOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace, BOOL alpha);
671242f350d172e106580348e24bab66b0d7e6a5vboxsyncvoid get_token(FILE *pnm_file, char *token);
671242f350d172e106580348e24bab66b0d7e6a5vboxsyncpng_uint_32 get_data (FILE *pnm_file, int depth);
671242f350d172e106580348e24bab66b0d7e6a5vboxsyncpng_uint_32 get_value (FILE *pnm_file, int depth);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync/*
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * main
671242f350d172e106580348e24bab66b0d7e6a5vboxsync */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsyncint main(int argc, char *argv[])
671242f350d172e106580348e24bab66b0d7e6a5vboxsync{
671242f350d172e106580348e24bab66b0d7e6a5vboxsync FILE *fp_rd = stdin;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync FILE *fp_al = NULL;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync FILE *fp_wr = stdout;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync BOOL interlace = FALSE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync BOOL alpha = FALSE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync int argi;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync for (argi = 1; argi < argc; argi++)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (argv[argi][0] == '-')
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync switch (argv[argi][1])
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync case 'i':
671242f350d172e106580348e24bab66b0d7e6a5vboxsync interlace = TRUE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync break;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync case 'a':
671242f350d172e106580348e24bab66b0d7e6a5vboxsync alpha = TRUE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync argi++;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if ((fp_al = fopen (argv[argi], "rb")) == NULL)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "PNM2PNG\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "Error: alpha-channel file %s does not exist\n",
671242f350d172e106580348e24bab66b0d7e6a5vboxsync argv[argi]);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync exit (1);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync break;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync case 'h':
671242f350d172e106580348e24bab66b0d7e6a5vboxsync case '?':
671242f350d172e106580348e24bab66b0d7e6a5vboxsync usage();
671242f350d172e106580348e24bab66b0d7e6a5vboxsync exit(0);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync break;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync default:
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "PNM2PNG\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "Error: unknown option %s\n", argv[argi]);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync usage();
671242f350d172e106580348e24bab66b0d7e6a5vboxsync exit(1);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync break;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync } /* end switch */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if (fp_rd == stdin)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if ((fp_rd = fopen (argv[argi], "rb")) == NULL)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "PNM2PNG\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "Error: file %s does not exist\n", argv[argi]);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync exit (1);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if (fp_wr == stdout)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if ((fp_wr = fopen (argv[argi], "wb")) == NULL)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "PNM2PNG\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "Error: can not create PNG-file %s\n", argv[argi]);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync exit (1);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "PNM2PNG\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "Error: too many parameters\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync usage();
671242f350d172e106580348e24bab66b0d7e6a5vboxsync exit (1);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync } /* end for */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#ifdef __TURBOC__
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* set stdin/stdout to binary, we're reading the PNM always! in binary format */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (fp_rd == stdin)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync setmode (STDIN, O_BINARY);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (fp_wr == stdout)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync setmode (STDOUT, O_BINARY);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#endif
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* call the conversion program itself */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (pnm2png (fp_rd, fp_wr, fp_al, interlace, alpha) == FALSE)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "PNM2PNG\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "Error: unsuccessful converting to PNG-image\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync exit (1);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* close input file */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fclose (fp_rd);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* close output file */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fclose (fp_wr);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* close alpha file */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (alpha)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fclose (fp_al);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return 0;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync}
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync/*
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * usage
671242f350d172e106580348e24bab66b0d7e6a5vboxsync */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsyncvoid usage()
671242f350d172e106580348e24bab66b0d7e6a5vboxsync{
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "PNM2PNG\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, " by Willem van Schaik, 1999\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#ifdef __TURBOC__
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, " for Turbo-C and Borland-C compilers\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#else
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, " for Linux (and Unix) compilers\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync#endif
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "Usage: pnm2png [options] <file>.<pnm> [<file>.png]\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, " or: ... | pnm2png [options]\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, "Options:\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, " -i[nterlace] write png-file with interlacing on\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, " -a[lpha] <file>.pgm read PNG alpha channel as pgm-file\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync fprintf (stderr, " -h | -? print this help-information\n");
671242f350d172e106580348e24bab66b0d7e6a5vboxsync}
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync/*
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * pnm2png
671242f350d172e106580348e24bab66b0d7e6a5vboxsync */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsyncBOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace, BOOL alpha)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync{
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_struct *png_ptr = NULL;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_info *info_ptr = NULL;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_byte *png_pixels = NULL;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_byte **row_pointers = NULL;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_byte *pix_ptr = NULL;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_uint_32 row_bytes;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync char type_token[16];
671242f350d172e106580348e24bab66b0d7e6a5vboxsync char width_token[16];
671242f350d172e106580348e24bab66b0d7e6a5vboxsync char height_token[16];
671242f350d172e106580348e24bab66b0d7e6a5vboxsync char maxval_token[16];
671242f350d172e106580348e24bab66b0d7e6a5vboxsync int color_type;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_uint_32 width, alpha_width;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_uint_32 height, alpha_height;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_uint_32 maxval;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync int bit_depth = 0;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync int channels;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync int alpha_depth = 0;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync int alpha_present;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync int row, col;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync BOOL raw, alpha_raw = FALSE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_uint_32 tmp16;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync int i;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* read header of PNM file */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync get_token(pnm_file, type_token);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (type_token[0] != 'P')
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return FALSE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if ((type_token[1] == '1') || (type_token[1] == '4'))
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync raw = (type_token[1] == '4');
671242f350d172e106580348e24bab66b0d7e6a5vboxsync color_type = PNG_COLOR_TYPE_GRAY;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync bit_depth = 1;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if ((type_token[1] == '2') || (type_token[1] == '5'))
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync raw = (type_token[1] == '5');
671242f350d172e106580348e24bab66b0d7e6a5vboxsync color_type = PNG_COLOR_TYPE_GRAY;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync get_token(pnm_file, width_token);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync sscanf (width_token, "%lu", &width);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync get_token(pnm_file, height_token);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync sscanf (height_token, "%lu", &height);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync get_token(pnm_file, maxval_token);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync sscanf (maxval_token, "%lu", &maxval);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (maxval <= 1)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync bit_depth = 1;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if (maxval <= 3)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync bit_depth = 2;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if (maxval <= 15)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync bit_depth = 4;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if (maxval <= 255)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync bit_depth = 8;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else /* if (maxval <= 65535) */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync bit_depth = 16;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if ((type_token[1] == '3') || (type_token[1] == '6'))
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync raw = (type_token[1] == '6');
671242f350d172e106580348e24bab66b0d7e6a5vboxsync color_type = PNG_COLOR_TYPE_RGB;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync get_token(pnm_file, width_token);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync sscanf (width_token, "%lu", &width);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync get_token(pnm_file, height_token);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync sscanf (height_token, "%lu", &height);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync get_token(pnm_file, maxval_token);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync sscanf (maxval_token, "%lu", &maxval);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (maxval <= 1)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync bit_depth = 1;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if (maxval <= 3)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync bit_depth = 2;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if (maxval <= 15)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync bit_depth = 4;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if (maxval <= 255)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync bit_depth = 8;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else /* if (maxval <= 65535) */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync bit_depth = 16;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return FALSE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* read header of PGM file with alpha channel */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (alpha)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (color_type == PNG_COLOR_TYPE_GRAY)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (color_type == PNG_COLOR_TYPE_RGB)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync color_type = PNG_COLOR_TYPE_RGB_ALPHA;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync get_token(alpha_file, type_token);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (type_token[0] != 'P')
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return FALSE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if ((type_token[1] == '2') || (type_token[1] == '5'))
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync alpha_raw = (type_token[1] == '5');
671242f350d172e106580348e24bab66b0d7e6a5vboxsync get_token(alpha_file, width_token);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync sscanf (width_token, "%lu", &alpha_width);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (alpha_width != width)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return FALSE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync get_token(alpha_file, height_token);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync sscanf (height_token, "%lu", &alpha_height);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (alpha_height != height)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return FALSE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync get_token(alpha_file, maxval_token);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync sscanf (maxval_token, "%lu", &maxval);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (maxval <= 1)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync alpha_depth = 1;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if (maxval <= 3)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync alpha_depth = 2;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if (maxval <= 15)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync alpha_depth = 4;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if (maxval <= 255)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync alpha_depth = 8;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else /* if (maxval <= 65535) */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync alpha_depth = 16;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (alpha_depth != bit_depth)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return FALSE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return FALSE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync } /* end if alpha */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* calculate the number of channels and store alpha-presence */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (color_type == PNG_COLOR_TYPE_GRAY)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync channels = 1;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync channels = 2;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if (color_type == PNG_COLOR_TYPE_RGB)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync channels = 3;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync channels = 4;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else
671242f350d172e106580348e24bab66b0d7e6a5vboxsync channels = 0; /* should not happen */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync alpha_present = (channels - 1) % 2;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* row_bytes is the width x number of channels x (bit-depth / 8) */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync row_bytes = width * channels * ((bit_depth <= 8) ? 1 : 2);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if ((png_pixels = (png_byte *) malloc (row_bytes * height * sizeof (png_byte))) == NULL)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return FALSE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* read data from PNM file */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync pix_ptr = png_pixels;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync for (row = 0; row < height; row++)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync for (col = 0; col < width; col++)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync for (i = 0; i < (channels - alpha_present); i++)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (raw)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync *pix_ptr++ = get_data (pnm_file, bit_depth);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (bit_depth <= 8)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync *pix_ptr++ = get_value (pnm_file, bit_depth);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync tmp16 = get_value (pnm_file, bit_depth);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync *pix_ptr = (png_byte) ((tmp16 >> 8) & 0xFF);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync pix_ptr++;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync *pix_ptr = (png_byte) (tmp16 & 0xFF);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync pix_ptr++;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (alpha) /* read alpha-channel from pgm file */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (alpha_raw)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync *pix_ptr++ = get_data (alpha_file, alpha_depth);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (alpha_depth <= 8)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync *pix_ptr++ = get_value (alpha_file, bit_depth);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync else
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync tmp16 = get_value (alpha_file, bit_depth);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync *pix_ptr++ = (png_byte) ((tmp16 >> 8) & 0xFF);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync *pix_ptr++ = (png_byte) (tmp16 & 0xFF);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync } /* if alpha */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync } /* end for col */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync } /* end for row */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* prepare the standard PNG structures */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (!png_ptr)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return FALSE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync info_ptr = png_create_info_struct (png_ptr);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (!info_ptr)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return FALSE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* setjmp() must be called in every function that calls a PNG-reading libpng function */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (setjmp (png_jmpbuf(png_ptr)))
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return FALSE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* initialize the png structure */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_init_io (png_ptr, png_file);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* we're going to write more or less the same PNG as the input file */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_set_IHDR (png_ptr, info_ptr, width, height, bit_depth, color_type,
671242f350d172e106580348e24bab66b0d7e6a5vboxsync (!interlace) ? PNG_INTERLACE_NONE : PNG_INTERLACE_ADAM7,
671242f350d172e106580348e24bab66b0d7e6a5vboxsync PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* write the file header information */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_write_info (png_ptr, info_ptr);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* if needed we will allocate memory for an new array of row-pointers */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (row_pointers == (unsigned char**) NULL)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if ((row_pointers = (png_byte **) malloc (height * sizeof (png_bytep))) == NULL)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return FALSE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* set the individual row_pointers to point at the correct offsets */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync for (i = 0; i < (height); i++)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync row_pointers[i] = png_pixels + i * row_bytes;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* write out the entire image data in one call */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_write_image (png_ptr, row_pointers);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* write the additional chuncks to the PNG file (not really needed) */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_write_end (png_ptr, info_ptr);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* clean up after the write, and free any memory allocated */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (row_pointers != (unsigned char**) NULL)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync free (row_pointers);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (png_pixels != (unsigned char*) NULL)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync free (png_pixels);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return TRUE;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync} /* end of pnm2png */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync/*
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * get_token() - gets the first string after whitespace
671242f350d172e106580348e24bab66b0d7e6a5vboxsync */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsyncvoid get_token(FILE *pnm_file, char *token)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync{
671242f350d172e106580348e24bab66b0d7e6a5vboxsync int i = 0;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* remove white-space */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync do
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync token[i] = (unsigned char) fgetc (pnm_file);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync while ((token[i] == '\n') || (token[i] == '\r') || (token[i] == ' '));
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync /* read string */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync do
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync i++;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync token[i] = (unsigned char) fgetc (pnm_file);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync while ((token[i] != '\n') && (token[i] != '\r') && (token[i] != ' '));
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync token[i] = '\0';
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync}
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync/*
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * get_data() - takes first byte and converts into next pixel value,
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * taking as much bits as defined by bit-depth and
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * using the bit-depth to fill up a byte (0Ah -> AAh)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsyncpng_uint_32 get_data (FILE *pnm_file, int depth)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync{
671242f350d172e106580348e24bab66b0d7e6a5vboxsync static int bits_left = 0;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync static int old_value = 0;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync static int mask = 0;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync int i;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_uint_32 ret_value;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (mask == 0)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync for (i = 0; i < depth; i++)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync mask = (mask >> 1) | 0x80;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (bits_left <= 0)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync {
671242f350d172e106580348e24bab66b0d7e6a5vboxsync old_value = fgetc (pnm_file);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync bits_left = 8;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync }
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync ret_value = old_value & mask;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync for (i = 1; i < (8 / depth); i++)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync ret_value = ret_value || (ret_value >> depth);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync old_value = (old_value << depth) & 0xFF;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync bits_left -= depth;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return ret_value;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync}
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync/*
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * get_value() - takes first (numeric) string and converts into number,
671242f350d172e106580348e24bab66b0d7e6a5vboxsync * using the bit-depth to fill up a byte (0Ah -> AAh)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsyncpng_uint_32 get_value (FILE *pnm_file, int depth)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync{
671242f350d172e106580348e24bab66b0d7e6a5vboxsync static png_uint_32 mask = 0;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_byte token[16];
671242f350d172e106580348e24bab66b0d7e6a5vboxsync png_uint_32 ret_value;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync int i = 0;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (mask == 0)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync for (i = 0; i < depth; i++)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync mask = (mask << 1) | 0x01;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync get_token (pnm_file, (char *) token);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync sscanf ((const char *) token, "%lu", &ret_value);
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync ret_value &= mask;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync if (depth < 8)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync for (i = 0; i < (8 / depth); i++)
671242f350d172e106580348e24bab66b0d7e6a5vboxsync ret_value = (ret_value << depth) || ret_value;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync return ret_value;
671242f350d172e106580348e24bab66b0d7e6a5vboxsync}
671242f350d172e106580348e24bab66b0d7e6a5vboxsync
671242f350d172e106580348e24bab66b0d7e6a5vboxsync/* end of source */
671242f350d172e106580348e24bab66b0d7e6a5vboxsync