| 1 | /*
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| 2 | * pnm2png.c --- conversion from PBM/PGM/PPM-file to PNG-file
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| 3 | * copyright (C) 1999,2015,2017 by Willem van Schaik <willem at schaik.com>
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| 4 | *
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| 5 | * version 1.0 - 1999.10.15 - First version.
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| 6 | * version 1.1 - 2015.07.29 - Fixed leaks (Glenn Randers-Pehrson)
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| 7 | * version 1.2 - 2017.04.22 - Add buffer-size check
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| 8 | * 1.3 - 2017.08.24 - Fix potential overflow in buffer-size check
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| 9 | * (Glenn Randers-Pehrson)
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| 10 | * 1.4 - 2017.08.28 - Add PNGMINUS_UNUSED (Christian Hesse)
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| 11 | *
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| 12 | * Permission to use, copy, modify, and distribute this software and
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| 13 | * its documentation for any purpose and without fee is hereby granted,
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| 14 | * provided that the above copyright notice appear in all copies and
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| 15 | * that both that copyright notice and this permission notice appear in
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| 16 | * supporting documentation. This software is provided "as is" without
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| 17 | * express or implied warranty.
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| 18 | */
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| 19 |
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| 20 | #include <stdio.h>
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| 21 | #include <stdlib.h>
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| 22 | #ifdef __TURBOC__
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| 23 | #include <mem.h>
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| 24 | #include <fcntl.h>
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| 25 | #endif
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| 26 | #include <zlib.h>
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| 27 |
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| 28 | #ifndef BOOL
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| 29 | #define BOOL unsigned char
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| 30 | #endif
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| 31 | #ifndef TRUE
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| 32 | #define TRUE (BOOL) 1
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| 33 | #endif
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| 34 | #ifndef FALSE
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| 35 | #define FALSE (BOOL) 0
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| 36 | #endif
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| 37 |
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| 38 | #define STDIN 0
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| 39 | #define STDOUT 1
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| 40 | #define STDERR 2
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| 41 |
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| 42 | /* to make pnm2png verbose so we can find problems (needs to be before png.h) */
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| 43 | #ifndef PNG_DEBUG
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| 44 | #define PNG_DEBUG 0
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| 45 | #endif
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| 46 |
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| 47 | #include "png.h"
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| 48 |
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| 49 | /* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
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| 50 | #ifndef png_jmpbuf
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| 51 | # define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
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| 52 | #endif
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| 53 |
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| 54 | #ifndef PNGMINUS_UNUSED
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| 55 | /* Unused formal parameter warnings are silenced using the following macro
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| 56 | * which is expected to have no bad effects on performance (optimizing
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| 57 | * compilers will probably remove it entirely).
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| 58 | */
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| 59 | # define PNGMINUS_UNUSED(param) (void)param
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| 60 | #endif
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| 61 |
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| 62 |
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| 63 | /* function prototypes */
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| 64 |
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| 65 | int main (int argc, char *argv[]);
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| 66 | void usage ();
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| 67 | BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
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| 68 | BOOL alpha);
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| 69 | void get_token(FILE *pnm_file, char *token);
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| 70 | png_uint_32 get_data (FILE *pnm_file, int depth);
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| 71 | png_uint_32 get_value (FILE *pnm_file, int depth);
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| 72 |
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| 73 | /*
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| 74 | * main
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| 75 | */
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| 76 |
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| 77 | int main(int argc, char *argv[])
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| 78 | {
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| 79 | FILE *fp_rd = stdin;
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| 80 | FILE *fp_al = NULL;
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| 81 | FILE *fp_wr = stdout;
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| 82 | BOOL interlace = FALSE;
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| 83 | BOOL alpha = FALSE;
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| 84 | int argi;
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| 85 |
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| 86 | for (argi = 1; argi < argc; argi++)
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| 87 | {
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| 88 | if (argv[argi][0] == '-')
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| 89 | {
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| 90 | switch (argv[argi][1])
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| 91 | {
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| 92 | case 'i':
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| 93 | interlace = TRUE;
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| 94 | break;
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| 95 | case 'a':
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| 96 | alpha = TRUE;
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| 97 | argi++;
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| 98 | if ((fp_al = fopen (argv[argi], "rb")) == NULL)
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| 99 | {
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| 100 | fprintf (stderr, "PNM2PNG\n");
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| 101 | fprintf (stderr, "Error: alpha-channel file %s does not exist\n",
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| 102 | argv[argi]);
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| 103 | exit (1);
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| 104 | }
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| 105 | break;
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| 106 | case 'h':
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| 107 | case '?':
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| 108 | usage();
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| 109 | exit(0);
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| 110 | break;
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| 111 | default:
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| 112 | fprintf (stderr, "PNM2PNG\n");
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| 113 | fprintf (stderr, "Error: unknown option %s\n", argv[argi]);
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| 114 | usage();
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| 115 | exit(1);
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| 116 | break;
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| 117 | } /* end switch */
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| 118 | }
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| 119 | else if (fp_rd == stdin)
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| 120 | {
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| 121 | if ((fp_rd = fopen (argv[argi], "rb")) == NULL)
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| 122 | {
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| 123 | fprintf (stderr, "PNM2PNG\n");
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| 124 | fprintf (stderr, "Error: file %s does not exist\n", argv[argi]);
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| 125 | exit (1);
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| 126 | }
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| 127 | }
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| 128 | else if (fp_wr == stdout)
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| 129 | {
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| 130 | if ((fp_wr = fopen (argv[argi], "wb")) == NULL)
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| 131 | {
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| 132 | fprintf (stderr, "PNM2PNG\n");
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| 133 | fprintf (stderr, "Error: can not create PNG-file %s\n", argv[argi]);
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| 134 | exit (1);
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| 135 | }
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| 136 | }
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| 137 | else
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| 138 | {
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| 139 | fprintf (stderr, "PNM2PNG\n");
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| 140 | fprintf (stderr, "Error: too many parameters\n");
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| 141 | usage();
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| 142 | exit (1);
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| 143 | }
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| 144 | } /* end for */
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| 145 |
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| 146 | #ifdef __TURBOC__
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| 147 | /* set stdin/stdout to binary, we're reading the PNM always! in binary format */
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| 148 | if (fp_rd == stdin)
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| 149 | {
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| 150 | setmode (STDIN, O_BINARY);
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| 151 | }
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| 152 | if (fp_wr == stdout)
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| 153 | {
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| 154 | setmode (STDOUT, O_BINARY);
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| 155 | }
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| 156 | #endif
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| 157 |
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| 158 | /* call the conversion program itself */
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| 159 | if (pnm2png (fp_rd, fp_wr, fp_al, interlace, alpha) == FALSE)
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| 160 | {
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| 161 | fprintf (stderr, "PNM2PNG\n");
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| 162 | fprintf (stderr, "Error: unsuccessful converting to PNG-image\n");
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| 163 | exit (1);
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| 164 | }
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| 165 |
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| 166 | /* close input file */
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| 167 | fclose (fp_rd);
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| 168 | /* close output file */
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| 169 | fclose (fp_wr);
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| 170 | /* close alpha file */
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| 171 | if (alpha)
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| 172 | fclose (fp_al);
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| 173 |
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| 174 | return 0;
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| 175 | }
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| 176 |
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| 177 | /*
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| 178 | * usage
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| 179 | */
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| 180 |
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| 181 | void usage()
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| 182 | {
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| 183 | fprintf (stderr, "PNM2PNG\n");
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| 184 | fprintf (stderr, " by Willem van Schaik, 1999\n");
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| 185 | #ifdef __TURBOC__
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| 186 | fprintf (stderr, " for Turbo-C and Borland-C compilers\n");
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| 187 | #else
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| 188 | fprintf (stderr, " for Linux (and Unix) compilers\n");
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| 189 | #endif
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| 190 | fprintf (stderr, "Usage: pnm2png [options] <file>.<pnm> [<file>.png]\n");
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| 191 | fprintf (stderr, " or: ... | pnm2png [options]\n");
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| 192 | fprintf (stderr, "Options:\n");
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| 193 | fprintf (stderr, " -i[nterlace] write png-file with interlacing on\n");
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| 194 | fprintf (stderr,
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| 195 | " -a[lpha] <file>.pgm read PNG alpha channel as pgm-file\n");
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| 196 | fprintf (stderr, " -h | -? print this help-information\n");
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| 197 | }
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| 198 |
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| 199 | /*
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| 200 | * pnm2png
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| 201 | */
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| 202 |
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| 203 | BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
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| 204 | BOOL alpha)
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| 205 | {
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| 206 | png_struct *png_ptr = NULL;
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| 207 | png_info *info_ptr = NULL;
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| 208 | png_byte *png_pixels = NULL;
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| 209 | png_byte **row_pointers = NULL;
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| 210 | png_byte *pix_ptr = NULL;
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| 211 | volatile png_uint_32 row_bytes;
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| 212 |
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| 213 | char type_token[16];
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| 214 | char width_token[16];
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| 215 | char height_token[16];
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| 216 | char maxval_token[16];
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| 217 | volatile int color_type=1;
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| 218 | unsigned long ul_width=0, ul_alpha_width=0;
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| 219 | unsigned long ul_height=0, ul_alpha_height=0;
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| 220 | unsigned long ul_maxval=0;
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| 221 | volatile png_uint_32 width=0, height=0;
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| 222 | volatile png_uint_32 alpha_width=0, alpha_height=0;
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| 223 | png_uint_32 maxval;
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| 224 | volatile int bit_depth = 0;
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| 225 | int channels=0;
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| 226 | int alpha_depth = 0;
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| 227 | int alpha_present=0;
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| 228 | int row, col;
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| 229 | BOOL raw, alpha_raw = FALSE;
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| 230 | #if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
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| 231 | BOOL packed_bitmap = FALSE;
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| 232 | #endif
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| 233 | png_uint_32 tmp16;
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| 234 | int i;
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| 235 |
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| 236 | /* read header of PNM file */
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| 237 |
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| 238 | get_token(pnm_file, type_token);
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| 239 | if (type_token[0] != 'P')
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| 240 | {
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| 241 | return FALSE;
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| 242 | }
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| 243 | else if ((type_token[1] == '1') || (type_token[1] == '4'))
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| 244 | {
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| 245 | #if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
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| 246 | raw = (type_token[1] == '4');
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| 247 | color_type = PNG_COLOR_TYPE_GRAY;
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| 248 | get_token(pnm_file, width_token);
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| 249 | sscanf (width_token, "%lu", &ul_width);
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| 250 | width = (png_uint_32) ul_width;
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| 251 | get_token(pnm_file, height_token);
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| 252 | sscanf (height_token, "%lu", &ul_height);
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| 253 | height = (png_uint_32) ul_height;
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| 254 | bit_depth = 1;
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| 255 | packed_bitmap = TRUE;
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| 256 | #else
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| 257 | fprintf (stderr, "PNM2PNG built without PNG_WRITE_INVERT_SUPPORTED and \n");
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| 258 | fprintf (stderr, "PNG_WRITE_PACK_SUPPORTED can't read PBM (P1,P4) files\n");
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| 259 | #endif
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| 260 | }
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| 261 | else if ((type_token[1] == '2') || (type_token[1] == '5'))
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| 262 | {
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| 263 | raw = (type_token[1] == '5');
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| 264 | color_type = PNG_COLOR_TYPE_GRAY;
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| 265 | get_token(pnm_file, width_token);
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| 266 | sscanf (width_token, "%lu", &ul_width);
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| 267 | width = (png_uint_32) ul_width;
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| 268 | get_token(pnm_file, height_token);
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| 269 | sscanf (height_token, "%lu", &ul_height);
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| 270 | height = (png_uint_32) ul_height;
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| 271 | get_token(pnm_file, maxval_token);
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| 272 | sscanf (maxval_token, "%lu", &ul_maxval);
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| 273 | maxval = (png_uint_32) ul_maxval;
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| 274 |
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| 275 | if (maxval <= 1)
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| 276 | bit_depth = 1;
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| 277 | else if (maxval <= 3)
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| 278 | bit_depth = 2;
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| 279 | else if (maxval <= 15)
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| 280 | bit_depth = 4;
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| 281 | else if (maxval <= 255)
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| 282 | bit_depth = 8;
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| 283 | else /* if (maxval <= 65535) */
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| 284 | bit_depth = 16;
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| 285 | }
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| 286 | else if ((type_token[1] == '3') || (type_token[1] == '6'))
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| 287 | {
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| 288 | raw = (type_token[1] == '6');
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| 289 | color_type = PNG_COLOR_TYPE_RGB;
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| 290 | get_token(pnm_file, width_token);
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| 291 | sscanf (width_token, "%lu", &ul_width);
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| 292 | width = (png_uint_32) ul_width;
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| 293 | get_token(pnm_file, height_token);
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| 294 | sscanf (height_token, "%lu", &ul_height);
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| 295 | height = (png_uint_32) ul_height;
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| 296 | get_token(pnm_file, maxval_token);
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| 297 | sscanf (maxval_token, "%lu", &ul_maxval);
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| 298 | maxval = (png_uint_32) ul_maxval;
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| 299 | if (maxval <= 1)
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| 300 | bit_depth = 1;
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| 301 | else if (maxval <= 3)
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| 302 | bit_depth = 2;
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| 303 | else if (maxval <= 15)
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| 304 | bit_depth = 4;
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| 305 | else if (maxval <= 255)
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| 306 | bit_depth = 8;
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| 307 | else /* if (maxval <= 65535) */
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| 308 | bit_depth = 16;
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| 309 | }
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| 310 | else
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| 311 | {
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| 312 | return FALSE;
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| 313 | }
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| 314 |
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| 315 | /* read header of PGM file with alpha channel */
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| 316 |
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| 317 | if (alpha)
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| 318 | {
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| 319 | if (color_type == PNG_COLOR_TYPE_GRAY)
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| 320 | color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
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| 321 | if (color_type == PNG_COLOR_TYPE_RGB)
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| 322 | color_type = PNG_COLOR_TYPE_RGB_ALPHA;
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| 323 |
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| 324 | get_token(alpha_file, type_token);
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| 325 | if (type_token[0] != 'P')
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| 326 | {
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| 327 | return FALSE;
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| 328 | }
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| 329 | else if ((type_token[1] == '2') || (type_token[1] == '5'))
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| 330 | {
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| 331 | alpha_raw = (type_token[1] == '5');
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| 332 | get_token(alpha_file, width_token);
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| 333 | sscanf (width_token, "%lu", &ul_alpha_width);
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| 334 | alpha_width=(png_uint_32) ul_alpha_width;
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| 335 | if (alpha_width != width)
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| 336 | return FALSE;
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| 337 | get_token(alpha_file, height_token);
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| 338 | sscanf (height_token, "%lu", &ul_alpha_height);
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| 339 | alpha_height = (png_uint_32) ul_alpha_height;
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| 340 | if (alpha_height != height)
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| 341 | return FALSE;
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| 342 | get_token(alpha_file, maxval_token);
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| 343 | sscanf (maxval_token, "%lu", &ul_maxval);
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| 344 | maxval = (png_uint_32) ul_maxval;
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| 345 | if (maxval <= 1)
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| 346 | alpha_depth = 1;
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| 347 | else if (maxval <= 3)
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| 348 | alpha_depth = 2;
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| 349 | else if (maxval <= 15)
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| 350 | alpha_depth = 4;
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| 351 | else if (maxval <= 255)
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| 352 | alpha_depth = 8;
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| 353 | else /* if (maxval <= 65535) */
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| 354 | alpha_depth = 16;
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| 355 | if (alpha_depth != bit_depth)
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| 356 | return FALSE;
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| 357 | }
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| 358 | else
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| 359 | {
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| 360 | return FALSE;
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| 361 | }
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| 362 | } /* end if alpha */
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| 363 |
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| 364 | /* calculate the number of channels and store alpha-presence */
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| 365 | if (color_type == PNG_COLOR_TYPE_GRAY)
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| 366 | channels = 1;
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| 367 | else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
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| 368 | channels = 2;
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| 369 | else if (color_type == PNG_COLOR_TYPE_RGB)
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| 370 | channels = 3;
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| 371 | else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
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| 372 | channels = 4;
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| 373 | #if 0
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| 374 | else
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| 375 | channels = 0; /* cannot happen */
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| 376 | #endif
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| 377 |
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| 378 | alpha_present = (channels - 1) % 2;
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| 379 |
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| 380 | #if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
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| 381 | if (packed_bitmap)
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| 382 | /* row data is as many bytes as can fit width x channels x bit_depth */
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| 383 | row_bytes = (width * channels * bit_depth + 7) / 8;
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| 384 | else
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| 385 | #endif
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| 386 | /* row_bytes is the width x number of channels x (bit-depth / 8) */
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| 387 | row_bytes = width * channels * ((bit_depth <= 8) ? 1 : 2);
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| 388 |
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| 389 | if ((row_bytes == 0 || (size_t)height > ((size_t)(-1))/(size_t)row_bytes))
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| 390 | {
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| 391 | /* too big */
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| 392 | return FALSE;
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| 393 | }
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| 394 | if ((png_pixels = (png_byte *)
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| 395 | malloc ((size_t)row_bytes * (size_t)height * sizeof (png_byte))) == NULL)
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| 396 | return FALSE;
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| 397 |
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| 398 | /* read data from PNM file */
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| 399 | pix_ptr = png_pixels;
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| 400 |
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| 401 | for (row = 0; row < (int) height; row++)
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| 402 | {
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| 403 | #if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
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| 404 | if (packed_bitmap)
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| 405 | {
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| 406 | for (i = 0; i < (int) row_bytes; i++)
|
|---|
| 407 | /* png supports this format natively so no conversion is needed */
|
|---|
| 408 | *pix_ptr++ = get_data (pnm_file, 8);
|
|---|
| 409 | } else
|
|---|
| 410 | #endif
|
|---|
| 411 | {
|
|---|
| 412 | for (col = 0; col < (int) width; col++)
|
|---|
| 413 | {
|
|---|
| 414 | for (i = 0; i < (channels - alpha_present); i++)
|
|---|
| 415 | {
|
|---|
| 416 | if (raw)
|
|---|
| 417 | *pix_ptr++ = get_data (pnm_file, bit_depth);
|
|---|
| 418 | else
|
|---|
| 419 | if (bit_depth <= 8)
|
|---|
| 420 | *pix_ptr++ = get_value (pnm_file, bit_depth);
|
|---|
| 421 | else
|
|---|
| 422 | {
|
|---|
| 423 | tmp16 = get_value (pnm_file, bit_depth);
|
|---|
| 424 | *pix_ptr = (png_byte) ((tmp16 >> 8) & 0xFF);
|
|---|
| 425 | pix_ptr++;
|
|---|
| 426 | *pix_ptr = (png_byte) (tmp16 & 0xFF);
|
|---|
| 427 | pix_ptr++;
|
|---|
| 428 | }
|
|---|
| 429 | }
|
|---|
| 430 |
|
|---|
| 431 | if (alpha) /* read alpha-channel from pgm file */
|
|---|
| 432 | {
|
|---|
| 433 | if (alpha_raw)
|
|---|
| 434 | *pix_ptr++ = get_data (alpha_file, alpha_depth);
|
|---|
| 435 | else
|
|---|
| 436 | if (alpha_depth <= 8)
|
|---|
| 437 | *pix_ptr++ = get_value (alpha_file, bit_depth);
|
|---|
| 438 | else
|
|---|
| 439 | {
|
|---|
| 440 | tmp16 = get_value (alpha_file, bit_depth);
|
|---|
| 441 | *pix_ptr++ = (png_byte) ((tmp16 >> 8) & 0xFF);
|
|---|
| 442 | *pix_ptr++ = (png_byte) (tmp16 & 0xFF);
|
|---|
| 443 | }
|
|---|
| 444 | } /* if alpha */
|
|---|
| 445 | } /* if packed_bitmap */
|
|---|
| 446 | } /* end for col */
|
|---|
| 447 | } /* end for row */
|
|---|
| 448 |
|
|---|
| 449 | /* prepare the standard PNG structures */
|
|---|
| 450 | png_ptr = png_create_write_struct (png_get_libpng_ver(NULL), NULL, NULL,
|
|---|
| 451 | NULL);
|
|---|
| 452 | if (!png_ptr)
|
|---|
| 453 | {
|
|---|
| 454 | free (png_pixels);
|
|---|
| 455 | png_pixels = NULL;
|
|---|
| 456 | return FALSE;
|
|---|
| 457 | }
|
|---|
| 458 | info_ptr = png_create_info_struct (png_ptr);
|
|---|
| 459 | if (!info_ptr)
|
|---|
| 460 | {
|
|---|
| 461 | png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
|
|---|
| 462 | free (png_pixels);
|
|---|
| 463 | png_pixels = NULL;
|
|---|
| 464 | return FALSE;
|
|---|
| 465 | }
|
|---|
| 466 |
|
|---|
| 467 | #if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
|
|---|
| 468 | if (packed_bitmap == TRUE)
|
|---|
| 469 | {
|
|---|
| 470 | png_set_packing (png_ptr);
|
|---|
| 471 | png_set_invert_mono (png_ptr);
|
|---|
| 472 | }
|
|---|
| 473 | #endif
|
|---|
| 474 |
|
|---|
| 475 | /* setjmp() must be called in every function that calls a PNG-reading libpng function */
|
|---|
| 476 | if (setjmp (png_jmpbuf(png_ptr)))
|
|---|
| 477 | {
|
|---|
| 478 | png_destroy_write_struct (&png_ptr, &info_ptr);
|
|---|
| 479 | free (png_pixels);
|
|---|
| 480 | png_pixels = NULL;
|
|---|
| 481 | return FALSE;
|
|---|
| 482 | }
|
|---|
| 483 |
|
|---|
| 484 | /* initialize the png structure */
|
|---|
| 485 | png_init_io (png_ptr, png_file);
|
|---|
| 486 |
|
|---|
| 487 | /* we're going to write more or less the same PNG as the input file */
|
|---|
| 488 | png_set_IHDR (png_ptr, info_ptr, width, height, bit_depth, color_type,
|
|---|
| 489 | (!interlace) ? PNG_INTERLACE_NONE : PNG_INTERLACE_ADAM7,
|
|---|
| 490 | PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
|
|---|
| 491 |
|
|---|
| 492 | /* write the file header information */
|
|---|
| 493 | png_write_info (png_ptr, info_ptr);
|
|---|
| 494 |
|
|---|
| 495 | /* if needed we will allocate memory for an new array of row-pointers */
|
|---|
| 496 | if (row_pointers == (unsigned char**) NULL)
|
|---|
| 497 | {
|
|---|
| 498 | if ((row_pointers = (png_byte **)
|
|---|
| 499 | malloc (height * sizeof (png_bytep))) == NULL)
|
|---|
| 500 | {
|
|---|
| 501 | png_destroy_write_struct (&png_ptr, &info_ptr);
|
|---|
| 502 | free (png_pixels);
|
|---|
| 503 | png_pixels = NULL;
|
|---|
| 504 | return FALSE;
|
|---|
| 505 | }
|
|---|
| 506 | }
|
|---|
| 507 |
|
|---|
| 508 | /* set the individual row_pointers to point at the correct offsets */
|
|---|
| 509 | for (i = 0; i < (int) height; i++)
|
|---|
| 510 | row_pointers[i] = png_pixels + i * row_bytes;
|
|---|
| 511 |
|
|---|
| 512 | /* write out the entire image data in one call */
|
|---|
| 513 | png_write_image (png_ptr, row_pointers);
|
|---|
| 514 |
|
|---|
| 515 | /* write the additional chunks to the PNG file (not really needed) */
|
|---|
| 516 | png_write_end (png_ptr, info_ptr);
|
|---|
| 517 |
|
|---|
| 518 | /* clean up after the write, and free any memory allocated */
|
|---|
| 519 | png_destroy_write_struct (&png_ptr, &info_ptr);
|
|---|
| 520 |
|
|---|
| 521 | if (row_pointers != (unsigned char**) NULL)
|
|---|
| 522 | free (row_pointers);
|
|---|
| 523 | if (png_pixels != (unsigned char*) NULL)
|
|---|
| 524 | free (png_pixels);
|
|---|
| 525 |
|
|---|
| 526 | PNGMINUS_UNUSED(raw); /* Quiet a Coverity defect */
|
|---|
| 527 |
|
|---|
| 528 | return TRUE;
|
|---|
| 529 | } /* end of pnm2png */
|
|---|
| 530 |
|
|---|
| 531 | /*
|
|---|
| 532 | * get_token() - gets the first string after whitespace
|
|---|
| 533 | */
|
|---|
| 534 |
|
|---|
| 535 | void get_token(FILE *pnm_file, char *token)
|
|---|
| 536 | {
|
|---|
| 537 | int i = 0;
|
|---|
| 538 | int ret;
|
|---|
| 539 |
|
|---|
| 540 | /* remove white-space and comment lines */
|
|---|
| 541 | do
|
|---|
| 542 | {
|
|---|
| 543 | ret = fgetc(pnm_file);
|
|---|
| 544 | if (ret == '#')
|
|---|
| 545 | {
|
|---|
| 546 | /* the rest of this line is a comment */
|
|---|
| 547 | do
|
|---|
| 548 | {
|
|---|
| 549 | ret = fgetc(pnm_file);
|
|---|
| 550 | }
|
|---|
| 551 | while ((ret != '\n') && (ret != '\r') && (ret != EOF));
|
|---|
| 552 | }
|
|---|
| 553 | if (ret == EOF) break;
|
|---|
| 554 | token[i] = (unsigned char) ret;
|
|---|
| 555 | }
|
|---|
| 556 | while ((token[i] == '\n') || (token[i] == '\r') || (token[i] == ' '));
|
|---|
| 557 |
|
|---|
| 558 | /* read string */
|
|---|
| 559 | do
|
|---|
| 560 | {
|
|---|
| 561 | ret = fgetc(pnm_file);
|
|---|
| 562 | if (ret == EOF) break;
|
|---|
| 563 | i++;
|
|---|
| 564 | token[i] = (unsigned char) ret;
|
|---|
| 565 | }
|
|---|
| 566 | while ((token[i] != '\n') && (token[i] != '\r') && (token[i] != ' '));
|
|---|
| 567 |
|
|---|
| 568 | token[i] = '\0';
|
|---|
| 569 |
|
|---|
| 570 | return;
|
|---|
| 571 | }
|
|---|
| 572 |
|
|---|
| 573 | /*
|
|---|
| 574 | * get_data() - takes first byte and converts into next pixel value,
|
|---|
| 575 | * taking as much bits as defined by bit-depth and
|
|---|
| 576 | * using the bit-depth to fill up a byte (0Ah -> AAh)
|
|---|
| 577 | */
|
|---|
| 578 |
|
|---|
| 579 | png_uint_32 get_data (FILE *pnm_file, int depth)
|
|---|
| 580 | {
|
|---|
| 581 | static int bits_left = 0;
|
|---|
| 582 | static int old_value = 0;
|
|---|
| 583 | static int mask = 0;
|
|---|
| 584 | int i;
|
|---|
| 585 | png_uint_32 ret_value;
|
|---|
| 586 |
|
|---|
| 587 | if (mask == 0)
|
|---|
| 588 | for (i = 0; i < depth; i++)
|
|---|
| 589 | mask = (mask >> 1) | 0x80;
|
|---|
| 590 |
|
|---|
| 591 | if (bits_left <= 0)
|
|---|
| 592 | {
|
|---|
| 593 | old_value = fgetc (pnm_file);
|
|---|
| 594 | bits_left = 8;
|
|---|
| 595 | }
|
|---|
| 596 |
|
|---|
| 597 | ret_value = old_value & mask;
|
|---|
| 598 | for (i = 1; i < (8 / depth); i++)
|
|---|
| 599 | ret_value = ret_value || (ret_value >> depth);
|
|---|
| 600 |
|
|---|
| 601 | old_value = (old_value << depth) & 0xFF;
|
|---|
| 602 | bits_left -= depth;
|
|---|
| 603 |
|
|---|
| 604 | return ret_value;
|
|---|
| 605 | }
|
|---|
| 606 |
|
|---|
| 607 | /*
|
|---|
| 608 | * get_value() - takes first (numeric) string and converts into number,
|
|---|
| 609 | * using the bit-depth to fill up a byte (0Ah -> AAh)
|
|---|
| 610 | */
|
|---|
| 611 |
|
|---|
| 612 | png_uint_32 get_value (FILE *pnm_file, int depth)
|
|---|
| 613 | {
|
|---|
| 614 | static png_uint_32 mask = 0;
|
|---|
| 615 | png_byte token[16];
|
|---|
| 616 | unsigned long ul_ret_value;
|
|---|
| 617 | png_uint_32 ret_value;
|
|---|
| 618 | int i = 0;
|
|---|
| 619 |
|
|---|
| 620 | if (mask == 0)
|
|---|
| 621 | for (i = 0; i < depth; i++)
|
|---|
| 622 | mask = (mask << 1) | 0x01;
|
|---|
| 623 |
|
|---|
| 624 | get_token (pnm_file, (char *) token);
|
|---|
| 625 | sscanf ((const char *) token, "%lu", &ul_ret_value);
|
|---|
| 626 | ret_value = (png_uint_32) ul_ret_value;
|
|---|
| 627 |
|
|---|
| 628 | ret_value &= mask;
|
|---|
| 629 |
|
|---|
| 630 | if (depth < 8)
|
|---|
| 631 | for (i = 0; i < (8 / depth); i++)
|
|---|
| 632 | ret_value = (ret_value << depth) || ret_value;
|
|---|
| 633 |
|
|---|
| 634 | return ret_value;
|
|---|
| 635 | }
|
|---|
| 636 |
|
|---|
| 637 | /* end of source */
|
|---|
| 638 |
|
|---|
