OpenWrt – Blame information for rev 3
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Rev | Author | Line No. | Line |
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1 | office | 1 | /* |
2 | * xorimage.c - partially based on OpenWrt's addpattern.c |
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3 | * |
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4 | * This program is free software; you can redistribute it and/or modify |
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5 | * it under the terms of the GNU General Public License as published by |
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6 | * the Free Software Foundation; either version 2 of the License, or |
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7 | * (at your option) any later version. |
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8 | * |
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9 | * This program is distributed in the hope that it will be useful, |
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10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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12 | * General Public License for more details. |
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13 | * |
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14 | * You should have received a copy of the GNU General Public License |
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15 | * along with this program; if not, write to the Free Software |
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16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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17 | */ |
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18 | |||
19 | |||
20 | #include <stdio.h> |
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21 | #include <stdlib.h> |
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22 | #include <string.h> |
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23 | #include <stdint.h> |
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24 | #include <unistd.h> |
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25 | #include <sys/stat.h> |
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26 | |||
27 | static char default_pattern[] = "12345678"; |
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28 | |||
29 | |||
30 | int xor_data(uint8_t *data, size_t len, const uint8_t *pattern, int p_len, int p_off) |
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31 | { |
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32 | int offset = p_off; |
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33 | while (len--) { |
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34 | *data ^= pattern[offset]; |
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35 | data++; |
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36 | offset = (offset + 1) % p_len; |
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37 | } |
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38 | return offset; |
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39 | } |
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40 | |||
41 | |||
42 | void usage(void) __attribute__ (( __noreturn__ )); |
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43 | |||
44 | void usage(void) |
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45 | { |
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3 | office | 46 | fprintf(stderr, "Usage: xorimage [-i infile] [-o outfile] [-p <pattern>]\n"); |
1 | office | 47 | exit(EXIT_FAILURE); |
48 | } |
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49 | |||
50 | |||
51 | int main(int argc, char **argv) |
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52 | { |
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53 | char buf[1024]; /* keep this at 1k or adjust garbage calc below */ |
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54 | FILE *in = stdin; |
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55 | FILE *out = stdout; |
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56 | char *ifn = NULL; |
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57 | char *ofn = NULL; |
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58 | const char *pattern = default_pattern; |
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59 | int c; |
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60 | int v0, v1, v2; |
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61 | size_t n; |
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62 | int p_len, p_off = 0; |
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63 | |||
3 | office | 64 | while ((c = getopt(argc, argv, "i:o:p:h")) != -1) { |
1 | office | 65 | switch (c) { |
66 | case 'i': |
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67 | ifn = optarg; |
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68 | break; |
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69 | case 'o': |
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70 | ofn = optarg; |
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71 | break; |
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72 | case 'p': |
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73 | pattern = optarg; |
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74 | break; |
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75 | case 'h': |
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76 | default: |
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77 | usage(); |
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78 | } |
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79 | } |
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80 | |||
81 | if (optind != argc || optind == 1) { |
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82 | fprintf(stderr, "illegal arg \"%s\"\n", argv[optind]); |
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83 | usage(); |
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84 | } |
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85 | |||
86 | if (ifn && !(in = fopen(ifn, "r"))) { |
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87 | fprintf(stderr, "can not open \"%s\" for reading\n", ifn); |
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88 | usage(); |
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89 | } |
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90 | |||
91 | if (ofn && !(out = fopen(ofn, "w"))) { |
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92 | fprintf(stderr, "can not open \"%s\" for writing\n", ofn); |
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93 | usage(); |
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94 | } |
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95 | |||
96 | p_len = strlen(pattern); |
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97 | |||
98 | if (p_len == 0) { |
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99 | fprintf(stderr, "pattern cannot be empty\n"); |
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100 | usage(); |
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101 | } |
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102 | |||
103 | |||
104 | while ((n = fread(buf, 1, sizeof(buf), in)) > 0) { |
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105 | if (n < sizeof(buf)) { |
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106 | if (ferror(in)) { |
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107 | FREAD_ERROR: |
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108 | fprintf(stderr, "fread error\n"); |
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109 | return EXIT_FAILURE; |
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110 | } |
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111 | } |
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112 | |||
3 | office | 113 | p_off = xor_data(buf, n, pattern, p_len, p_off); |
1 | office | 114 | |
115 | if (!fwrite(buf, n, 1, out)) { |
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116 | FWRITE_ERROR: |
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117 | fprintf(stderr, "fwrite error\n"); |
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118 | return EXIT_FAILURE; |
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119 | } |
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120 | } |
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121 | |||
122 | if (ferror(in)) { |
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123 | goto FREAD_ERROR; |
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124 | } |
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125 | |||
126 | if (fflush(out)) { |
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127 | goto FWRITE_ERROR; |
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128 | } |
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129 | |||
130 | fclose(in); |
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131 | fclose(out); |
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132 | |||
133 | return EXIT_SUCCESS; |
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134 | } |