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339
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1 /*
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2 extract.c
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3 Copyright © 2009 William Astle
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4
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5 This file is part of LWAR.
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6
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7 LWAR is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 */
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21
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22 #include <config.h>
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23
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24 #include <errno.h>
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25 #include <stdio.h>
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26 #include <stdlib.h>
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27 #include <string.h>
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28
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29 #include "lwar.h"
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30
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31 void do_extract(void)
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32 {
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33 FILE *f;
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34 char buf[8];
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35 long l;
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36 int c;
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37 char fnbuf[1024];
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38 int i;
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39 FILE *nf;
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40
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41 f = fopen(archive_file, "r");
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42 if (!f)
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43 {
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44 perror("Opening archive file");
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45 exit(1);
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46 }
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47
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48 fread(buf, 1, 6, f);
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49 if (memcmp("LWAR1V", buf, 6))
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50 {
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51 fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
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52 exit(1);
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53 }
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54
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55 for (;;)
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56 {
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57 c = fgetc(f);
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58 if (ferror(f))
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59 {
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60 perror("Reading archive file");
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61 exit(1);
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62 }
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63 if (c == EOF)
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64 return;
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65
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66
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67 // find the end of the file name
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68 if (!c)
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69 return;
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70
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71 i = 0;
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72 while (c)
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73 {
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74 fnbuf[i++] = c;
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75 c = fgetc(f);
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76 if (c == EOF || ferror(f))
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77 {
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78 fprintf(stderr, "Bad archive file\n");
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79 exit(1);
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80 }
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81 }
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82 fnbuf[i] = 0;
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83
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84 // get length of archive member
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85 l = 0;
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86 c = fgetc(f);
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87 l = c << 24;
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88 c = fgetc(f);
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89 l |= c << 16;
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90 c = fgetc(f);
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91 l |= c << 8;
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92 c = fgetc(f);
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93 l |= c;
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94
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95 for (i = 0; i < nfiles; i++)
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96 {
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97 if (!strcmp(files[i], fnbuf))
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98 break;
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99 }
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100 if (i < nfiles || nfiles == 0)
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101 {
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102 // extract the file
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103 nf = fopen(fnbuf, "w");
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104 if (!nf)
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105 {
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106 fprintf(stderr, "Cannot extract '%s': %s\n", fnbuf, strerror(errno));
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107 exit(1);
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108 }
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109 while (l)
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110 {
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111 c = fgetc(f);
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112 fputc(c, nf);
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113 l--;
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114 }
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115 fclose(nf);
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116 }
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117 else
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118 {
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119 // skip the file
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120 fseek(f, l, SEEK_CUR);
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121 }
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122 }
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123 }
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