133 lines
4.4 KiB
C
133 lines
4.4 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <utime.h>
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#include "libbb.h"
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/* Extract files in the linear linked list 'extract_headers' to either
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* filesystem, stdout or buffer depending on the value of 'function' which is
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* described in extract_files.h
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*
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* prefix doesnt have to be just a directory, it may prefix the filename as well.
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*
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* e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath
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* '/var/lib/dpkg/info/' and all files/dirs created in that dir will have
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* 'dpkg.' as their prefix
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*
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* For this reason if prefix does point to a dir then it must end with a
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* trailing '/' or else the last dir will be assumed to be the file prefix
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*/
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char *extract_archive(FILE *src_stream, FILE *out_stream, file_headers_t *extract_headers, int function, const char *prefix)
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{
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FILE *dst_stream = NULL;
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char *full_name = NULL;
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char *buffer = NULL;
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size_t uncompressed_count = 0;
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struct utimbuf t;
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/* find files to extract or display */
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while (extract_headers != NULL) {
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/* prefix doesnt have to be a proper path it may prepend
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* the filename as well */
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if (prefix != NULL) {
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/* strip leading '/' in filename to extract as prefix may not be dir */
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char *tmp_str = strchr(extract_headers->name, '/');
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if (tmp_str == NULL) {
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tmp_str = extract_headers->name;
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} else {
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tmp_str++;
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}
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/* Cant use concat_path_file here as prefix might not be a directory */
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full_name = xmalloc(strlen(prefix) + strlen(tmp_str) + 1);
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strcpy(full_name, prefix);
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strcat(full_name, tmp_str);
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} else {
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full_name = extract_headers->name;
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}
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/* Seek to start of file, have to use fgetc as src_stream may be a pipe
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* you cant [lf]seek on pipes */
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while (uncompressed_count < extract_headers->offset) {
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fgetc(src_stream);
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uncompressed_count++;
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}
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if (S_ISREG(extract_headers->mode)) {
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if (function & extract_to_stdout) {
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copy_file_chunk(src_stream, out_stream, extract_headers->size);
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uncompressed_count += extract_headers->size;
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}
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else if (function & extract_all_to_fs) {
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dst_stream = wfopen(full_name, "w");
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copy_file_chunk(src_stream, dst_stream, extract_headers->size);
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uncompressed_count += extract_headers->size;
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fclose(dst_stream);
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}
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else if (function & extract_one_to_buffer) {
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buffer = (char *) xmalloc(extract_headers->size + 1);
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fread(buffer, 1, extract_headers->size, src_stream);
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break;
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}
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}
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#if defined BB_DPKG | defined BB_DPKG_DEB
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else if (S_ISDIR(extract_headers->mode)) {
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if (function & extract_all_to_fs) {
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if (create_path(full_name, extract_headers->mode) == FALSE) {
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perror_msg("Cannot mkdir %s", extract_headers->name);
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return NULL;
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}
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}
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}
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else if (S_ISLNK(extract_headers->mode)) {
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if (function & extract_all_to_fs) {
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if (symlink(extract_headers->link_name, full_name) < 0) {
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perror_msg("Cannot create hard link from %s to '%s'", extract_headers->name, extract_headers->link_name);
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return NULL;
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}
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}
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}
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#endif
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if (function & extract_verbose_list) {
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fprintf(out_stream, "%s %d/%d %8d %s ", mode_string(extract_headers->mode),
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extract_headers->uid, extract_headers->gid,
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(int) extract_headers->size, time_string(extract_headers->mtime));
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}
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if ((function & extract_list) || (function & extract_verbose_list)){
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/* fputs doesnt add a trailing \n, so use fprintf */
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fprintf(out_stream, "%s\n", extract_headers->name);
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}
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if (function & extract_preserve_date) {
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t.actime = extract_headers->mtime;
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t.modtime = extract_headers->mtime;
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utime(full_name, &t);
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}
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chmod(full_name, extract_headers->mode);
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free(full_name);
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extract_headers = extract_headers->next;
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}
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return(buffer);
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}
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