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annotate lwar/extract.c @ 467:a6c9129e5948

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Move version header into a common direction to better reflect what it is. The version header isn't really associated with lwlib itself since that is intended to be some generic type routines that can be used by other programs. It is, however, directly associated with lwtools. Thus, it should be related to lwtools itself rather than the more generic lwlib.
author William Astle <lost@l-w.ca>
date Thu, 01 Mar 2018 21:25:51 -0700
parents 45df37e81741
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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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 <errno.h>
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23 #include <stdio.h>
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24 #include <stdlib.h>
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25 #include <string.h>
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26
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27 #include "lwar.h"
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28
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29 void do_extract(void)
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30 {
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31 FILE *f;
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32 char buf[8];
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33 char *filename;
0
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34 long l;
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35 int c;
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36 char fnbuf[1024];
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37 int i;
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38 FILE *nf;
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39
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40 f = fopen(archive_file, "rb");
0
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41 if (!f)
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42 {
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43 perror("Opening archive file");
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44 exit(1);
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45 }
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46
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47 (void)(fread(buf, 1, 6, f) && 1);
0
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48 if (memcmp("LWAR1V", buf, 6))
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49 {
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50 fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
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51 exit(1);
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52 }
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53
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54 for (;;)
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55 {
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56 c = fgetc(f);
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57 if (ferror(f))
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58 {
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59 perror("Reading archive file");
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60 exit(1);
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61 }
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62 if (c == EOF)
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63 return;
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64
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65
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66 // find the end of the file name
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67 if (!c)
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68 return;
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69
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70 i = 0;
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71 while (c)
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72 {
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73 fnbuf[i++] = c;
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74 c = fgetc(f);
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75 if (c == EOF || ferror(f))
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76 {
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77 fprintf(stderr, "Bad archive file\n");
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78 exit(1);
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79 }
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80 }
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81 fnbuf[i] = 0;
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82 filename = get_file_name(fnbuf);
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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(get_file_name(files[i]), filename))
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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(filename, "wb");
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104 if (!nf)
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105 {
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106 fprintf(stderr, "Cannot extract '%s': %s\n", filename, 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 }