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authorGlenn L McGrath <bug1@ihug.co.nz>2001-06-13 07:34:03 +0000
committerGlenn L McGrath <bug1@ihug.co.nz>2001-06-13 07:34:03 +0000
commit17822cd60aaf9333a9895494edcf03a0037de54c (patch)
tree3bf667fdf5b78df26acfc662955d7e38f3c5c4d5 /libbb/untar.c
parent9aff9036035fbed074e8e711b96c5c934e668884 (diff)
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Reorganise unarchive functions, new files, removed some
Diffstat (limited to '')
-rw-r--r--libbb/untar.c225
1 files changed, 0 insertions, 225 deletions
diff --git a/libbb/untar.c b/libbb/untar.c
deleted file mode 100644
index b6b44967f..000000000
--- a/libbb/untar.c
+++ /dev/null
@@ -1,225 +0,0 @@
1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU Library General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
15 *
16 * NOTE: This is used by deb_extract to avoid calling the whole tar applet.
17 * Its functionality should be merged with tar to avoid duplication
18 */
19
20#include <stdlib.h>
21#include <string.h>
22#include <unistd.h>
23#include "libbb.h"
24
25/*
26 * stdout can be redircted to FILE *output
27 * If const char *file_prefix isnt NULL is prepended to all the extracted filenames.
28 * The purpose of const char *argument depends on the value of const int untar_function
29 */
30
31extern char *untar(FILE *src_tar_file, FILE *output, const int untar_function,
32 const char *argument, const char *file_prefix)
33{
34 typedef struct raw_tar_header {
35 char name[100]; /* 0-99 */
36 char mode[8]; /* 100-107 */
37 char uid[8]; /* 108-115 */
38 char gid[8]; /* 116-123 */
39 char size[12]; /* 124-135 */
40 char mtime[12]; /* 136-147 */
41 char chksum[8]; /* 148-155 */
42 char typeflag; /* 156-156 */
43 char linkname[100]; /* 157-256 */
44 char magic[6]; /* 257-262 */
45 char version[2]; /* 263-264 */
46 char uname[32]; /* 265-296 */
47 char gname[32]; /* 297-328 */
48 char devmajor[8]; /* 329-336 */
49 char devminor[8]; /* 337-344 */
50 char prefix[155]; /* 345-499 */
51 char padding[12]; /* 500-512 */
52 } raw_tar_header_t;
53
54 raw_tar_header_t raw_tar_header;
55 unsigned char *temp = (unsigned char *) &raw_tar_header;
56 long i;
57 long next_header_offset = 0;
58 long uncompressed_count = 0;
59 size_t size;
60 mode_t mode;
61
62 while (fread((char *) &raw_tar_header, 1, 512, src_tar_file) == 512) {
63 long sum = 0;
64
65 if (ferror(src_tar_file) || feof(src_tar_file)) {
66 perror_msg("untar: ");
67 break;
68 }
69
70 uncompressed_count += 512;
71
72 /* Check header has valid magic */
73 if (strncmp(raw_tar_header.magic, "ustar", 5) != 0) {
74/*
75 * FIXME, Need HELP with this
76 *
77 * This has to fail silently or it incorrectly reports errors when called from
78 * deb_extract.
79 * The problem is deb_extract decompresses the .gz file in a child process and
80 * untar reads from the child proccess. The child process finishes and exits,
81 * but fread reads 0's from the src_tar_file even though the child
82 * closed its handle.
83 */
84// error_msg("Invalid tar magic");
85 break;
86 }
87
88 /* Do checksum on headers */
89 for (i = 0; i < 148 ; i++) {
90 sum += temp[i];
91 }
92 sum += ' ' * 8;
93 for (i = 156; i < 512 ; i++) {
94 sum += temp[i];
95 }
96 if (sum != strtol(raw_tar_header.chksum, NULL, 8)) {
97 error_msg("Invalid tar header checksum");
98 break;
99 }
100
101 /* convert to type'ed variables */
102 size = strtol(raw_tar_header.size, NULL, 8);
103 parse_mode(raw_tar_header.mode, &mode);
104
105 /* start of next header is at */
106 next_header_offset = uncompressed_count + size;
107 if (size % 512 != 0) {
108 next_header_offset += (512 - size % 512);
109 }
110
111 /* If an exclude list is specified check current file against list */
112#if 0
113 if (*exclude_list != NULL) {
114 i = 0;
115 while (exclude_list[i] != 0) {
116 if (strncmp(exclude_list[i], raw_tar_header.name, strlen(raw_tar_header.name)) == 0) {
117 break;
118 }
119 i++;
120 }
121 if (exclude_list[i] != 0) {
122 continue;
123 }
124 }
125#endif
126 if (untar_function & (extract_contents | extract_verbose_extract | extract_contents_to_file)) {
127 fprintf(output, "%s\n", raw_tar_header.name);
128 }
129
130 switch (raw_tar_header.typeflag ) {
131 case '0':
132 case '\0': {
133 /* If the name ends in a '/' then assume it is
134 * supposed to be a directory, and fall through
135 */
136 int name_length = strlen(raw_tar_header.name);
137 if (raw_tar_header.name[name_length - 1] != '/') {
138 switch (untar_function) {
139 case (extract_extract):
140 case (extract_verbose_extract):
141 case (extract_control): {
142 FILE *dst_file = NULL;
143 char *full_name;
144
145 if (file_prefix != NULL) {
146 full_name = xmalloc(strlen(argument) + strlen(file_prefix) + name_length + 3);
147 sprintf(full_name, "%s/%s.%s", argument, file_prefix, strrchr(raw_tar_header.name, '/') + 1);
148 } else {
149 full_name = concat_path_file(argument, raw_tar_header.name);
150 }
151 dst_file = wfopen(full_name, "w");
152 copy_file_chunk(src_tar_file, dst_file, (unsigned long long) size);
153 uncompressed_count += size;
154 fclose(dst_file);
155 chmod(full_name, mode);
156 free(full_name);
157 }
158 break;
159 case (extract_info):
160 if (strstr(raw_tar_header.name, argument) != NULL) {
161 copy_file_chunk(src_tar_file, stdout, (unsigned long long) size);
162 uncompressed_count += size;
163 }
164 break;
165 case (extract_field):
166 if (strstr(raw_tar_header.name, "./control") != NULL) {
167 return(read_text_file_to_buffer(src_tar_file));
168 }
169 break;
170 }
171 break;
172 }
173 }
174 case '5':
175 if (untar_function & (extract_extract | extract_verbose_extract | extract_control)) {
176 int ret;
177 char *dir;
178 dir = concat_path_file(argument, raw_tar_header.name);
179 ret = create_path(dir, mode);
180 free(dir);
181 if (ret == FALSE) {
182 perror_msg("%s: Cannot mkdir", raw_tar_header.name);
183 return NULL;
184 }
185 chmod(dir, mode);
186 }
187 break;
188 case '1':
189 if (untar_function & (extract_extract | extract_verbose_extract | extract_control)) {
190 if (link(raw_tar_header.linkname, raw_tar_header.name) < 0) {
191 perror_msg("%s: Cannot create hard link to '%s'", raw_tar_header.name, raw_tar_header.linkname);
192 return NULL;
193 }
194 }
195 break;
196 case '2':
197 if (untar_function & (extract_extract | extract_verbose_extract | extract_control)) {
198 if (symlink(raw_tar_header.linkname, raw_tar_header.name) < 0) {
199 perror_msg("%s: Cannot create symlink to '%s'", raw_tar_header.name, raw_tar_header.linkname);
200 return NULL;
201 }
202 }
203 break;
204 case '3':
205 case '4':
206 case '6':
207// if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
208// errorFlag=TRUE;
209// break;
210 default:
211 error_msg("Unknown file type '%c' in tar file", raw_tar_header.typeflag);
212 return NULL;
213 }
214 /*
215 * Seek to start of next block, cant use fseek as unzip() does support it
216 */
217 while (uncompressed_count < next_header_offset) {
218 if (fgetc(src_tar_file) == EOF) {
219 break;
220 }
221 uncompressed_count++;
222 }
223 }
224 return NULL;
225}