summaryrefslogtreecommitdiff
path: root/libbb/extract_archive.c
diff options
context:
space:
mode:
authorGlenn L McGrath2001-06-13 07:34:03 +0000
committerGlenn L McGrath2001-06-13 07:34:03 +0000
commit17822cd60aaf9333a9895494edcf03a0037de54c (patch)
tree3bf667fdf5b78df26acfc662955d7e38f3c5c4d5 /libbb/extract_archive.c
parent9aff9036035fbed074e8e711b96c5c934e668884 (diff)
downloadbusybox-17822cd60aaf9333a9895494edcf03a0037de54c.zip
busybox-17822cd60aaf9333a9895494edcf03a0037de54c.tar.gz
Reorganise unarchive functions, new files, removed some
Diffstat (limited to 'libbb/extract_archive.c')
-rw-r--r--libbb/extract_archive.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/libbb/extract_archive.c b/libbb/extract_archive.c
new file mode 100644
index 0000000..f22cbb6
--- /dev/null
+++ b/libbb/extract_archive.c
@@ -0,0 +1,132 @@
+/*
+ * 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 <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <utime.h>
+#include "libbb.h"
+
+/* Extract files in the linear linked list 'extract_headers' to either
+ * filesystem, stdout or buffer depending on the value of 'function' which is
+ * described in extract_files.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, file_headers_t *extract_headers, int function, const char *prefix)
+{
+ FILE *dst_stream = NULL;
+ char *full_name = NULL;
+ char *buffer = NULL;
+ size_t uncompressed_count = 0;
+ struct utimbuf t;
+
+ /* find files to extract or display */
+ while (extract_headers != NULL) {
+ /* 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 */
+ char *tmp_str = strchr(extract_headers->name, '/');
+ if (tmp_str == NULL) {
+ tmp_str = extract_headers->name;
+ } else {
+ tmp_str++;
+ }
+ /* Cant use concat_path_file here as prefix might not be a directory */
+ full_name = xmalloc(strlen(prefix) + strlen(tmp_str) + 1);
+ strcpy(full_name, prefix);
+ strcat(full_name, tmp_str);
+ } else {
+ full_name = extract_headers->name;
+ }
+
+ /* Seek to start of file, have to use fgetc as src_stream may be a pipe
+ * you cant [lf]seek on pipes */
+ while (uncompressed_count < extract_headers->offset) {
+ fgetc(src_stream);
+ uncompressed_count++;
+ }
+
+ if (S_ISREG(extract_headers->mode)) {
+ if (function & extract_to_stdout) {
+ copy_file_chunk(src_stream, out_stream, extract_headers->size);
+ uncompressed_count += extract_headers->size;
+ }
+ else if (function & extract_all_to_fs) {
+ dst_stream = wfopen(full_name, "w");
+ copy_file_chunk(src_stream, dst_stream, extract_headers->size);
+ uncompressed_count += extract_headers->size;
+ fclose(dst_stream);
+ }
+ else if (function & extract_one_to_buffer) {
+ buffer = (char *) xmalloc(extract_headers->size + 1);
+ fread(buffer, 1, extract_headers->size, src_stream);
+ break;
+ }
+ }
+#if defined BB_DPKG | defined BB_DPKG_DEB
+ else if (S_ISDIR(extract_headers->mode)) {
+ if (function & extract_all_to_fs) {
+ if (create_path(full_name, extract_headers->mode) == FALSE) {
+ perror_msg("Cannot mkdir %s", extract_headers->name);
+ return NULL;
+ }
+ }
+ }
+ else if (S_ISLNK(extract_headers->mode)) {
+ if (function & extract_all_to_fs) {
+ if (symlink(extract_headers->link_name, full_name) < 0) {
+ perror_msg("Cannot create hard link from %s to '%s'", extract_headers->name, extract_headers->link_name);
+ return NULL;
+ }
+ }
+ }
+#endif
+ if (function & extract_verbose_list) {
+ fprintf(out_stream, "%s %d/%d %8d %s ", mode_string(extract_headers->mode),
+ extract_headers->uid, extract_headers->gid,
+ (int) extract_headers->size, time_string(extract_headers->mtime));
+ }
+
+ if ((function & extract_list) || (function & extract_verbose_list)){
+ /* fputs doesnt add a trailing \n, so use fprintf */
+ fprintf(out_stream, "%s\n", extract_headers->name);
+ }
+
+ if (function & extract_preserve_date) {
+ t.actime = extract_headers->mtime;
+ t.modtime = extract_headers->mtime;
+ utime(full_name, &t);
+ }
+ chmod(full_name, extract_headers->mode);
+ free(full_name);
+
+ extract_headers = extract_headers->next;
+ }
+
+ return(buffer);
+}
+