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annotate lwar/extract.c @ 427:45df37e81741

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Add option to ignore paths when extracting or adding files with lwar Add option to lwar to strip path names from filenames when objects are added to an archive. Also strip path names from objects when extracting them, if present.
author David Flamand <dlflamand@gmail.com>
date Tue, 15 Nov 2016 21:43:33 -0700
parents 6f4c4d59666f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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");
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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);
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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 }