[3745] | 1 | /**************************************************************************
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| 2 | *
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| 3 | * mgfelics.c -- Program to compress/decompress grey scale images
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| 4 | * Copyright (C) 1994 Stuart Inglis
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| 5 | *
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| 6 | * This program is free software; you can redistribute it and/or modify
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| 7 | * it under the terms of the GNU General Public License as published by
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| 8 | * the Free Software Foundation; either version 2 of the License, or
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| 9 | * (at your option) any later version.
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| 10 | *
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| 11 | * This program is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | * GNU General Public License for more details.
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| 15 | *
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| 16 | * You should have received a copy of the GNU General Public License
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| 17 | * along with this program; if not, write to the Free Software
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| 18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 19 | *
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| 20 | * $Id: mgfelics.c 3745 2003-02-20 21:20:24Z mdewsnip $
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| 21 | *
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| 22 | **************************************************************************/
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| 23 |
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| 24 | #include "sysfuncs.h"
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| 25 | #include "utils.h"
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| 26 |
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| 27 |
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| 28 | #define MAXKVALUE 32
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| 29 |
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| 30 |
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| 31 |
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| 32 | void encode (unsigned int *line, int width, int height, int maxval, int maxk,
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| 33 | FILE * fp_in, FILE * fp_out, int (*get) (FILE *));
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| 34 |
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| 35 | void decode (unsigned int *line, int width, int height, int maxval, int maxk,
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| 36 | FILE * fp_in, FILE * fp_out);
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| 37 |
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| 38 |
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| 39 | void
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| 40 | usage (char *prog)
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| 41 | {
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| 42 | fprintf (stderr, "usage:\n");
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| 43 | fprintf (stderr, "\t%s -e [-k n] infile [>compressed]\n"
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| 44 | "or\n"
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| 45 | "\t%s -d compressed-infile [>outfile]\n", prog, prog);
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| 46 | exit (1);
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| 47 | }
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| 48 |
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| 49 |
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| 50 |
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| 51 |
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| 52 | int
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| 53 | main (int argc, char **argv)
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| 54 | {
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| 55 | FILE *fp_in = (stdin), *fp_out = (stdout);
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| 56 | int width, height, maxval;
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| 57 | u_long magic;
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| 58 | char *filename = NULL;
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| 59 | unsigned int *line;
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| 60 | int maxk = 0;
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| 61 | int i;
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| 62 | int encode_flag = 0, decode_flag = 0;
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| 63 |
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| 64 | if (argc < 2)
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| 65 | usage (argv[0]);
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| 66 |
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| 67 | for (i = 1; i < argc; i++)
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| 68 | {
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| 69 | if (!strcmp (argv[i], "-h"))
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| 70 | usage (argv[0]);
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| 71 | else if (!strcmp (argv[i], "-e"))
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| 72 | encode_flag = 1;
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| 73 | else if (!strcmp (argv[i], "-d"))
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| 74 | decode_flag = 1;
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| 75 | else if (!strcmp (argv[i], "-k"))
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| 76 | {
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| 77 | maxk = atoi (argv[++i]);
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| 78 | }
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| 79 | else if (argv[i][0] == '-')
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| 80 | error_msg (argv[0], "unknown switch:", argv[i]);
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| 81 | else if (!filename)
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| 82 | filename = argv[i];
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| 83 | else
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| 84 | error_msg (argv[0], "too many filenames specified.", "");
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| 85 | }
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| 86 |
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| 87 | if (encode_flag == decode_flag)
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| 88 | error_msg (argv[0], "please specify either encode XOR decode.", "");
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| 89 |
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| 90 | if (!filename)
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| 91 | error_msg (argv[0], "please specify a filename.", "");
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| 92 |
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| 93 | if ((encode_flag) && (maxk >= MAXKVALUE))
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| 94 | { /* to fit into 32 bit integers */
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| 95 | fprintf (stderr, "%s: k value of %d is too large; it must be less than %d\n",
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| 96 | argv[0], maxk, MAXKVALUE);
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| 97 | exit (1);
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| 98 | }
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| 99 |
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| 100 |
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| 101 | if ((fp_in = fopen (filename, "rb")) == NULL)
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| 102 | error_msg (argv[0], "unable to open file:", filename);
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| 103 |
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| 104 | /* read file header to determine the type and dimensions */
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| 105 |
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| 106 |
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| 107 | magic = magic_read (fp_in);
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| 108 | if (magic != MAGIC_FELICS)
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| 109 | {
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| 110 | rewind (fp_in);
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| 111 | magic = getmagicno_short_pop (fp_in);
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| 112 | }
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| 113 |
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| 114 | if ((decode_flag && (magic != MAGIC_FELICS)) ||
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| 115 | (encode_flag && ((magic != MAGIC_P2) && (magic != MAGIC_P5))))
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| 116 | {
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| 117 | fclose (fp_in);
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| 118 | error_msg (argv[0], encode_flag ? "only PGM files can be used." : "only felics compressed files can be used.", "");
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| 119 | }
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| 120 |
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| 121 | width = gethint (fp_in);
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| 122 | height = gethint (fp_in);
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| 123 | maxval = gethint (fp_in);
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| 124 |
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| 125 | if ((line = (unsigned int *) malloc (width * sizeof (int *))) == NULL)
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| 126 | {
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| 127 | fclose (fp_in);
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| 128 | error_msg (argv[0], "unable to allocate memory,", "");
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| 129 | }
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| 130 |
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| 131 |
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| 132 | if (encode_flag)
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| 133 | {
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| 134 | magic_write (fp_out, MAGIC_FELICS);
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| 135 | fprintf (fp_out, "%d\n%d\n%d\n%d\n", width, height, maxval, maxk);
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| 136 | encode (line, width, height, maxval, maxk, fp_in, fp_out,
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| 137 | magic == MAGIC_P2 ? getint : fgetc);
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| 138 | }
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| 139 | else if (decode_flag)
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| 140 | {
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| 141 | if (maxk)
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| 142 | warn (argv[0], "k value not required for decompression, ignored.", "");
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| 143 |
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| 144 | maxk = gethint (fp_in);
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| 145 | fprintf (fp_out, "P%d\n%d %d\n%d\n", maxval < 256 ? 5 : 2,
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| 146 | width, height, maxval);
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| 147 | decode (line, width, height, maxval, maxk, fp_in, fp_out);
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| 148 | }
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| 149 |
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| 150 |
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| 151 | fclose (fp_in);
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| 152 | fclose (fp_out);
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| 153 |
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| 154 | return 0;
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| 155 | }
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