1 /* vi: set sw=4 ts=4: */
3 * Mini ar implementation for busybox
5 * Copyright (C) 2000 by Glenn McGrath
7 * Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
11 * Archive creation support:
12 * Copyright (C) 2010 Nokia Corporation. All rights reserved.
13 * Written by Alexander Shishkin.
15 * There is no single standard to adhere to so ar may not portable
16 * between different systems
17 * http://www.unix-systems.org/single_unix_specification_v2/xcu/ar.html
21 #include "unarchive.h"
24 #if ENABLE_FEATURE_AR_CREATE
25 /* filter out entries with same names as specified on the command line */
26 static char FAST_FUNC filter_replaceable(archive_handle_t *handle)
28 if (find_list_entry(handle->accept, handle->file_header->name))
34 static void output_ar_header(archive_handle_t *handle)
36 /* GNU ar 2.19.51.0.14 creates malformed archives
37 * if input files are >10G. It also truncates files >4GB
38 * (uses "size mod 4G"). We abort in this case:
39 * We could add support for up to 10G files, but this is unlikely to be useful.
40 * Note that unpacking side limits all fields to "unsigned int" data type,
41 * and treats "all ones" as an error indicator. Thus max we allow here is UINT_MAX-1.
44 /* for 2nd field: mtime */
45 MAX11CHARS = UINT_MAX > 0xffffffff ? (unsigned)99999999999 : UINT_MAX-1,
46 /* for last field: filesize */
47 MAX10CHARS = UINT_MAX > 0xffffffff ? (unsigned)9999999999 : UINT_MAX-1,
50 struct file_header_t *fh = handle->file_header;
52 if (handle->offset & 1) {
53 xwrite(handle->src_fd, "\n", 1);
57 /* Careful! The widths should be exact. Fields must be separated */
58 if (sizeof(off_t) > 4 && fh->size > (off_t)MAX10CHARS) {
59 bb_error_msg_and_die("'%s' is bigger than ar can handle", fh->name);
61 fdprintf(handle->src_fd, "%-16.16s%-12lu%-6u%-6u%-8o%-10"OFF_FMT"u`\n",
63 (sizeof(time_t) > 4 && fh->mtime > MAX11CHARS) ? (long)0 : (long)fh->mtime,
64 fh->uid > 99999 ? 0 : (int)fh->uid,
65 fh->gid > 99999 ? 0 : (int)fh->gid,
66 (int)fh->mode & 07777777,
70 handle->offset += AR_HEADER_LEN;
74 * when replacing files in an existing archive, copy from the the
75 * original archive those files that are to be left intact
77 static void FAST_FUNC copy_data(archive_handle_t *handle)
79 archive_handle_t *out_handle = handle->ar__out;
80 struct file_header_t *fh = handle->file_header;
82 out_handle->file_header = fh;
83 output_ar_header(out_handle);
85 bb_copyfd_exact_size(handle->src_fd, out_handle->src_fd, fh->size);
86 out_handle->offset += fh->size;
89 static int write_ar_header(archive_handle_t *handle)
92 char fn_h[17]; /* 15 + "/" + NUL */
96 fn = llist_pop(&handle->accept);
102 handle->file_header->mtime = st.st_mtime;
103 handle->file_header->uid = st.st_uid;
104 handle->file_header->gid = st.st_gid;
105 handle->file_header->mode = st.st_mode;
106 handle->file_header->size = st.st_size;
107 handle->file_header->name = fn_h;
108 //TODO: if ENABLE_FEATURE_AR_LONG_FILENAMES...
109 sprintf(fn_h, "%.15s/", bb_basename(fn));
111 output_ar_header(handle);
113 fd = xopen(fn, O_RDONLY);
114 bb_copyfd_exact_size(fd, handle->src_fd, st.st_size);
116 handle->offset += st.st_size;
121 static int write_ar_archive(archive_handle_t *handle)
124 archive_handle_t *out_handle;
126 if (fstat(handle->src_fd, &st) == -1)
127 bb_simple_perror_msg_and_die(handle->ar__name);
129 /* if archive exists, create a new handle for output.
130 * we create it in place of the old one.
132 if (st.st_size != 0) {
133 out_handle = init_handle();
134 xunlink(handle->ar__name);
135 out_handle->src_fd = xopen(handle->ar__name, O_WRONLY | O_CREAT | O_TRUNC);
136 out_handle->accept = handle->accept;
141 handle->ar__out = out_handle;
143 xwrite(out_handle->src_fd, AR_MAGIC "\n", AR_MAGIC_LEN + 1);
144 out_handle->offset += AR_MAGIC_LEN + 1;
146 /* skip to the end of the archive if we have to append stuff */
147 if (st.st_size != 0) {
148 handle->filter = filter_replaceable;
149 handle->action_data = copy_data;
150 unpack_ar_archive(handle);
153 while (write_ar_header(out_handle) == 0)
156 /* optional, since we exit right after we return */
157 if (ENABLE_FEATURE_CLEAN_UP) {
158 close(handle->src_fd);
159 if (out_handle->src_fd != handle->src_fd)
160 close(out_handle->src_fd);
165 #endif /* FEATURE_AR_CREATE */
167 static void FAST_FUNC header_verbose_list_ar(const file_header_t *file_header)
169 const char *mode = bb_mode_string(file_header->mode);
172 mtime = ctime(&file_header->mtime);
174 memmove(&mtime[17], &mtime[20], 4);
176 printf("%s %u/%u%7"OFF_FMT"u %s %s\n", &mode[1],
177 (int)file_header->uid, (int)file_header->gid,
179 &mtime[4], file_header->name
183 #define AR_OPT_VERBOSE (1 << 0)
184 #define AR_OPT_PRESERVE_DATE (1 << 1)
185 /* "ar r" implies create, but warns about it. c suppresses warning.
186 * bbox accepts but ignores it: */
187 #define AR_OPT_CREATE (1 << 2)
189 #define AR_CMD_PRINT (1 << 3)
190 #define FIRST_CMD AR_CMD_PRINT
191 #define AR_CMD_LIST (1 << 4)
192 #define AR_CMD_EXTRACT (1 << 5)
193 #define AR_CMD_INSERT (1 << 6)
195 int ar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
196 int ar_main(int argc UNUSED_PARAM, char **argv)
198 archive_handle_t *archive_handle;
201 archive_handle = init_handle();
203 /* --: prepend '-' to the first argument if required */
204 /* -1: at least one param is reqd */
205 /* one of p,t,x[,r] is required */
206 opt_complementary = "--:-1:p:t:x"IF_FEATURE_AR_CREATE(":r");
207 opt = getopt32(argv, "voc""ptx"IF_FEATURE_AR_CREATE("r"));
211 if (t & (t-1)) /* more than one of p,t,x[,r] are specified */
214 if (opt & AR_CMD_PRINT) {
215 archive_handle->action_data = data_extract_to_stdout;
217 if (opt & AR_CMD_LIST) {
218 archive_handle->action_header = header_list;
220 if (opt & AR_CMD_EXTRACT) {
221 archive_handle->action_data = data_extract_all;
223 if (opt & AR_OPT_PRESERVE_DATE) {
224 archive_handle->ah_flags |= ARCHIVE_RESTORE_DATE;
226 if (opt & AR_OPT_VERBOSE) {
227 archive_handle->action_header = header_verbose_list_ar;
229 #if ENABLE_FEATURE_AR_CREATE
230 archive_handle->ar__name = *argv;
232 archive_handle->src_fd = xopen(*argv++,
233 (opt & AR_CMD_INSERT)
238 archive_handle->filter = filter_accept_list;
240 llist_add_to_end(&archive_handle->accept, *argv++);
243 #if ENABLE_FEATURE_AR_CREATE
244 if (opt & AR_CMD_INSERT)
245 return write_ar_archive(archive_handle);
248 unpack_ar_archive(archive_handle);