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annotate lunalcd/ppmtocmd.c @ 176:fb2f6497ba53 default tip

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doc/Linux-DTR-RTS-flaw: point to new location of this article
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 11 Dec 2023 19:37:20 +0000
parents 09d26f19a2c2
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
66
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 #include <stdio.h>
09d26f19a2c2 lunalcd: ppmtocmd program written
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2 #include <ctype.h>
09d26f19a2c2 lunalcd: ppmtocmd program written
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3 #include <stdlib.h>
09d26f19a2c2 lunalcd: ppmtocmd program written
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4
09d26f19a2c2 lunalcd: ppmtocmd program written
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5 static char *ppm_filename;
09d26f19a2c2 lunalcd: ppmtocmd program written
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6 static FILE *ppmfile;
09d26f19a2c2 lunalcd: ppmtocmd program written
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7 static int ppm_is_ascii; /* P3 format instead of P6 */
09d26f19a2c2 lunalcd: ppmtocmd program written
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8
09d26f19a2c2 lunalcd: ppmtocmd program written
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9 /*
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10 * This function reads one ASCII-encoded integer from a PPM file.
09d26f19a2c2 lunalcd: ppmtocmd program written
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11 * It handles the white space and comment rules of the PPM format.
09d26f19a2c2 lunalcd: ppmtocmd program written
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12 */
09d26f19a2c2 lunalcd: ppmtocmd program written
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13 static int
09d26f19a2c2 lunalcd: ppmtocmd program written
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14 ppm_get_ascii_number()
09d26f19a2c2 lunalcd: ppmtocmd program written
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15 {
09d26f19a2c2 lunalcd: ppmtocmd program written
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16 int accum, c;
09d26f19a2c2 lunalcd: ppmtocmd program written
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17
09d26f19a2c2 lunalcd: ppmtocmd program written
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18 do {
09d26f19a2c2 lunalcd: ppmtocmd program written
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19 c = getc(ppmfile);
09d26f19a2c2 lunalcd: ppmtocmd program written
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20 if (c < 0) {
09d26f19a2c2 lunalcd: ppmtocmd program written
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21 badeof: fprintf(stderr, "%s: unexpected EOF\n", ppm_filename);
09d26f19a2c2 lunalcd: ppmtocmd program written
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22 return(-1);
09d26f19a2c2 lunalcd: ppmtocmd program written
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23 }
09d26f19a2c2 lunalcd: ppmtocmd program written
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24 if (c == '#') {
09d26f19a2c2 lunalcd: ppmtocmd program written
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25 do
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26 c = getc(ppmfile);
09d26f19a2c2 lunalcd: ppmtocmd program written
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27 while (c >= 0 && c != '\n');
09d26f19a2c2 lunalcd: ppmtocmd program written
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28 if (c != '\n')
09d26f19a2c2 lunalcd: ppmtocmd program written
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29 goto badeof;
09d26f19a2c2 lunalcd: ppmtocmd program written
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30 }
09d26f19a2c2 lunalcd: ppmtocmd program written
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31 } while (isspace(c));
09d26f19a2c2 lunalcd: ppmtocmd program written
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32 if (!isdigit(c)) {
09d26f19a2c2 lunalcd: ppmtocmd program written
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33 fprintf(stderr,
09d26f19a2c2 lunalcd: ppmtocmd program written
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34 "%s: unexpected data where a number was expected\n",
09d26f19a2c2 lunalcd: ppmtocmd program written
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35 ppm_filename);
09d26f19a2c2 lunalcd: ppmtocmd program written
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36 return(-1);
09d26f19a2c2 lunalcd: ppmtocmd program written
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37 }
09d26f19a2c2 lunalcd: ppmtocmd program written
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38 for (accum = c - '0'; ; ) {
09d26f19a2c2 lunalcd: ppmtocmd program written
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39 c = getc(ppmfile);
09d26f19a2c2 lunalcd: ppmtocmd program written
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40 if (c < 0 || isspace(c))
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41 break;
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42 if (!isdigit(c)) {
09d26f19a2c2 lunalcd: ppmtocmd program written
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43 fprintf(stderr,
09d26f19a2c2 lunalcd: ppmtocmd program written
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44 "%s: bad character in the middle of a number\n",
09d26f19a2c2 lunalcd: ppmtocmd program written
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45 ppm_filename);
09d26f19a2c2 lunalcd: ppmtocmd program written
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46 return(-1);
09d26f19a2c2 lunalcd: ppmtocmd program written
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47 }
09d26f19a2c2 lunalcd: ppmtocmd program written
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48 accum = accum * 10 + c - '0';
09d26f19a2c2 lunalcd: ppmtocmd program written
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49 }
09d26f19a2c2 lunalcd: ppmtocmd program written
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50 return accum;
09d26f19a2c2 lunalcd: ppmtocmd program written
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51 }
09d26f19a2c2 lunalcd: ppmtocmd program written
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52
09d26f19a2c2 lunalcd: ppmtocmd program written
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53 /*
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54 * This function reads and parses the PPM header of our input file.
09d26f19a2c2 lunalcd: ppmtocmd program written
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55 */
09d26f19a2c2 lunalcd: ppmtocmd program written
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56 static int
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57 ppm_read_header()
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58 {
09d26f19a2c2 lunalcd: ppmtocmd program written
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59 int magic1, magic2;
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60 int rd;
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61
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62 magic1 = getc(ppmfile);
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63 magic2 = getc(ppmfile);
09d26f19a2c2 lunalcd: ppmtocmd program written
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64 if (magic1 == 'P' && magic2 == '3')
09d26f19a2c2 lunalcd: ppmtocmd program written
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65 ppm_is_ascii = 1;
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66 else if (magic1 == 'P' && magic2 == '6')
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67 ppm_is_ascii = 0;
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68 else {
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69 fprintf(stderr, "%s: P3 or P6 format expected\n", ppm_filename);
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70 return(-1);
09d26f19a2c2 lunalcd: ppmtocmd program written
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71 }
09d26f19a2c2 lunalcd: ppmtocmd program written
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72 rd = ppm_get_ascii_number();
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73 if (rd < 0)
09d26f19a2c2 lunalcd: ppmtocmd program written
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74 return(-1);
09d26f19a2c2 lunalcd: ppmtocmd program written
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75 if (rd != 176) {
09d26f19a2c2 lunalcd: ppmtocmd program written
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76 fprintf(stderr, "%s: width is not 176\n", ppm_filename);
09d26f19a2c2 lunalcd: ppmtocmd program written
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77 return(-1);
09d26f19a2c2 lunalcd: ppmtocmd program written
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78 }
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79 rd = ppm_get_ascii_number();
09d26f19a2c2 lunalcd: ppmtocmd program written
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80 if (rd < 0)
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81 return(-1);
09d26f19a2c2 lunalcd: ppmtocmd program written
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82 if (rd != 220) {
09d26f19a2c2 lunalcd: ppmtocmd program written
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83 fprintf(stderr, "%s: height is not 220\n", ppm_filename);
09d26f19a2c2 lunalcd: ppmtocmd program written
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84 return(-1);
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85 }
09d26f19a2c2 lunalcd: ppmtocmd program written
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86 rd = ppm_get_ascii_number();
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87 if (rd < 0)
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88 return(-1);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
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89 if (rd != 255) {
09d26f19a2c2 lunalcd: ppmtocmd program written
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parents:
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90 fprintf(stderr, "%s: maxval is not 255\n", ppm_filename);
09d26f19a2c2 lunalcd: ppmtocmd program written
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91 return(-1);
09d26f19a2c2 lunalcd: ppmtocmd program written
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parents:
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92 }
09d26f19a2c2 lunalcd: ppmtocmd program written
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93 return(0);
09d26f19a2c2 lunalcd: ppmtocmd program written
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94 }
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95
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96 /*
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97 * This function reads a single R, G or B value from a PPM file.
09d26f19a2c2 lunalcd: ppmtocmd program written
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parents:
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98 */
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99 static int
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100 ppm_get_pixval()
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101 {
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102 int c;
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103
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104 if (ppm_is_ascii)
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105 return ppm_get_ascii_number();
09d26f19a2c2 lunalcd: ppmtocmd program written
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106 c = getc(ppmfile);
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107 if (c < 0) {
09d26f19a2c2 lunalcd: ppmtocmd program written
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108 fprintf(stderr, "%s: EOF while reading binary pixel data\n",
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109 ppm_filename);
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110 return(-1);
09d26f19a2c2 lunalcd: ppmtocmd program written
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111 }
09d26f19a2c2 lunalcd: ppmtocmd program written
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112 return c;
09d26f19a2c2 lunalcd: ppmtocmd program written
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113 }
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114
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115 static int
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116 ppm_get_rgb()
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117 {
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118 int r, g, b;
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119
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120 r = ppm_get_pixval();
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121 if (r < 0)
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122 return(-1);
09d26f19a2c2 lunalcd: ppmtocmd program written
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parents:
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123 g = ppm_get_pixval();
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124 if (g < 0)
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125 return(-1);
09d26f19a2c2 lunalcd: ppmtocmd program written
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126 b = ppm_get_pixval();
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127 if (b < 0)
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parents:
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128 return(-1);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
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129 /* convert to 5:6:5 */
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Mychaela Falconia <falcon@freecalypso.org>
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130 r >>= 3;
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131 g >>= 2;
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132 b >>= 3;
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parents:
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133 return (r << 11) | (g << 5) | b;
09d26f19a2c2 lunalcd: ppmtocmd program written
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parents:
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134 }
09d26f19a2c2 lunalcd: ppmtocmd program written
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135
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parents:
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136 main(argc, argv)
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137 char **argv;
09d26f19a2c2 lunalcd: ppmtocmd program written
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138 {
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 int rc;
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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140 unsigned n;
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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142 if (argc != 3) {
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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143 fprintf(stderr, "usage: %s ppmfile output-mode\n", argv[0]);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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144 exit(1);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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145 }
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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146 ppm_filename = argv[1];
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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147 ppmfile = fopen(ppm_filename, "r");
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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148 if (!ppmfile) {
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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149 perror(ppm_filename);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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150 exit(1);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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151 }
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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152 rc = ppm_read_header();
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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153 if (rc < 0)
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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154 exit(1);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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155 set_output_mode(argv[2]);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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156 write_ir(0x20);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 write_dr(0);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 write_ir(0x21);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 write_dr(0);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 write_ir(0x22);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 bulk_wd_prep();
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 for (n = 0; n < 176*220; n++) {
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
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163 rc = ppm_get_rgb();
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 if (rc < 0)
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 exit(1);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 bulk_wd(rc);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 }
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 exit(0);
09d26f19a2c2 lunalcd: ppmtocmd program written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 }