aboutsummaryrefslogtreecommitdiff
path: root/archival/libunarchive/unarchive.c
diff options
context:
space:
mode:
Diffstat (limited to 'archival/libunarchive/unarchive.c')
-rw-r--r--archival/libunarchive/unarchive.c241
1 files changed, 241 insertions, 0 deletions
diff --git a/archival/libunarchive/unarchive.c b/archival/libunarchive/unarchive.c
new file mode 100644
index 000000000..4a42eaf7d
--- /dev/null
+++ b/archival/libunarchive/unarchive.c
@@ -0,0 +1,241 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <errno.h>
+#include <fnmatch.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <utime.h>
+#include "unarchive.h"
+#include "libbb.h"
+
+/* Extract the data postioned at src_stream to either filesystem, stdout or
+ * buffer depending on the value of 'function' which is defined in libbb.h
+ *
+ * prefix doesnt have to be just a directory, it may prefix the filename as well.
+ *
+ * e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath
+ * '/var/lib/dpkg/info/' and all files/dirs created in that dir will have
+ * 'dpkg.' as their prefix
+ *
+ * For this reason if prefix does point to a dir then it must end with a
+ * trailing '/' or else the last dir will be assumed to be the file prefix
+ */
+char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *file_entry,
+ const int function, const char *prefix)
+{
+ FILE *dst_stream = NULL;
+ char *full_name = NULL;
+ char *buffer = NULL;
+ struct utimbuf t;
+
+ /* prefix doesnt have to be a proper path it may prepend
+ * the filename as well */
+ if (prefix != NULL) {
+ /* strip leading '/' in filename to extract as prefix may not be dir */
+ /* Cant use concat_path_file here as prefix might not be a directory */
+ char *path = file_entry->name;
+ if (strncmp("./", path, 2) == 0) {
+ path += 2;
+ if (strlen(path) == 0) {
+ return(NULL);
+ }
+ }
+ full_name = xmalloc(strlen(prefix) + strlen(path) + 1);
+ strcpy(full_name, prefix);
+ strcat(full_name, path);
+ } else {
+ full_name = file_entry->name;
+ }
+ if (function & extract_to_stdout) {
+ if (S_ISREG(file_entry->mode)) {
+ copy_file_chunk(src_stream, out_stream, file_entry->size);
+ archive_offset += file_entry->size;
+ }
+ }
+ else if (function & extract_one_to_buffer) {
+ if (S_ISREG(file_entry->mode)) {
+ buffer = (char *) xmalloc(file_entry->size + 1);
+ fread(buffer, 1, file_entry->size, src_stream);
+ buffer[file_entry->size] = '\0';
+ archive_offset += file_entry->size;
+ return(buffer);
+ }
+ }
+ else if (function & extract_all_to_fs) {
+ struct stat oldfile;
+ int stat_res;
+ stat_res = lstat (full_name, &oldfile);
+ if (stat_res == 0) { /* The file already exists */
+ if ((function & extract_unconditional) || (oldfile.st_mtime < file_entry->mtime)) {
+ if (!S_ISDIR(oldfile.st_mode)) {
+ unlink(full_name); /* Directories might not be empty etc */
+ }
+ } else {
+ if ((function & extract_quiet) != extract_quiet) {
+ error_msg("%s not created: newer or same age file exists", file_entry->name);
+ }
+ seek_sub_file(src_stream, file_entry->size);
+ return (NULL);
+ }
+ }
+ if (function & extract_create_leading_dirs) { /* Create leading directories with default umask */
+ char *buf, *parent;
+ buf = xstrdup(full_name);
+ parent = dirname(buf);
+ if (make_directory (parent, -1, FILEUTILS_RECUR) != 0) {
+ if ((function & extract_quiet) != extract_quiet) {
+ error_msg("couldn't create leading directories");
+ }
+ }
+ free (buf);
+ }
+ switch(file_entry->mode & S_IFMT) {
+ case S_IFREG:
+ if (file_entry->link_name) { /* Found a cpio hard link */
+ if (link(file_entry->link_name, full_name) != 0) {
+ if ((function & extract_quiet) != extract_quiet) {
+ perror_msg("Cannot link from %s to '%s'",
+ file_entry->name, file_entry->link_name);
+ }
+ }
+ } else {
+ if ((dst_stream = wfopen(full_name, "w")) == NULL) {
+ seek_sub_file(src_stream, file_entry->size);
+ return NULL;
+ }
+ archive_offset += file_entry->size;
+ copy_file_chunk(src_stream, dst_stream, file_entry->size);
+ fclose(dst_stream);
+ }
+ break;
+ case S_IFDIR:
+ if (stat_res != 0) {
+ if (mkdir(full_name, file_entry->mode) < 0) {
+ if ((function & extract_quiet) != extract_quiet) {
+ perror_msg("extract_archive: %s", full_name);
+ }
+ }
+ }
+ break;
+ case S_IFLNK:
+ if (symlink(file_entry->link_name, full_name) < 0) {
+ if ((function & extract_quiet) != extract_quiet) {
+ perror_msg("Cannot create symlink from %s to '%s'", file_entry->name, file_entry->link_name);
+ }
+ return NULL;
+ }
+ break;
+ case S_IFSOCK:
+ case S_IFBLK:
+ case S_IFCHR:
+ case S_IFIFO:
+ if (mknod(full_name, file_entry->mode, file_entry->device) == -1) {
+ if ((function & extract_quiet) != extract_quiet) {
+ perror_msg("Cannot create node %s", file_entry->name);
+ }
+ return NULL;
+ }
+ break;
+ }
+
+ /* Changing a symlink's properties normally changes the properties of the
+ * file pointed to, so dont try and change the date or mode, lchown does
+ * does the right thing, but isnt available in older versions of libc */
+ if (S_ISLNK(file_entry->mode)) {
+#if (__GLIBC__ > 2) && (__GLIBC_MINOR__ > 1)
+ lchown(full_name, file_entry->uid, file_entry->gid);
+#endif
+ } else {
+ if (function & extract_preserve_date) {
+ t.actime = file_entry->mtime;
+ t.modtime = file_entry->mtime;
+ utime(full_name, &t);
+ }
+ chmod(full_name, file_entry->mode);
+ chown(full_name, file_entry->uid, file_entry->gid);
+ }
+ } else {
+ /* If we arent extracting data we have to skip it,
+ * if data size is 0 then then just do it anyway
+ * (saves testing for it) */
+ seek_sub_file(src_stream, file_entry->size);
+ }
+
+ /* extract_list and extract_verbose_list can be used in conjunction
+ * with one of the above four extraction functions, so do this seperately */
+ if (function & extract_verbose_list) {
+ fprintf(out_stream, "%s %d/%d %8d %s ", mode_string(file_entry->mode),
+ file_entry->uid, file_entry->gid,
+ (int) file_entry->size, time_string(file_entry->mtime));
+ }
+ if ((function & extract_list) || (function & extract_verbose_list)){
+ /* fputs doesnt add a trailing \n, so use fprintf */
+ fprintf(out_stream, "%s\n", full_name);
+ }
+
+ free(full_name);
+
+ return(NULL); /* Maybe we should say if failed */
+}
+
+char *unarchive(FILE *src_stream, FILE *out_stream, file_header_t *(*get_headers)(FILE *),
+ const int extract_function, const char *prefix, char **include_name, char **exclude_name)
+{
+ file_header_t *file_entry;
+ int extract_flag = TRUE;
+ int i;
+ char *buffer = NULL;
+
+ archive_offset = 0;
+ while ((file_entry = get_headers(src_stream)) != NULL) {
+
+ if (include_name != NULL) {
+ extract_flag = FALSE;
+ for(i = 0; include_name[i] != 0; i++) {
+ if (fnmatch(include_name[i], file_entry->name, FNM_LEADING_DIR) == 0) {
+ extract_flag = TRUE;
+ break;
+ }
+ }
+ } else {
+ extract_flag = TRUE;
+ }
+
+ /* If the file entry is in the exclude list dont extract it */
+ if (exclude_name != NULL) {
+ for(i = 0; exclude_name[i] != 0; i++) {
+ if (fnmatch(exclude_name[i], file_entry->name, FNM_LEADING_DIR) == 0) {
+ extract_flag = FALSE;
+ break;
+ }
+ }
+ }
+
+ if (extract_flag == TRUE) {
+ buffer = extract_archive(src_stream, out_stream, file_entry, extract_function, prefix);
+ } else {
+ /* seek past the data entry */
+ seek_sub_file(src_stream, file_entry->size);
+ }
+ free(file_entry->name);
+ free(file_entry->link_name);
+ free(file_entry);
+ }
+ return(buffer);
+} \ No newline at end of file