*** empty log message ***

git-svn-id: svn://busybox.net/trunk/busybox@3581 69ca8d6d-28ef-0310-b511-8ec308f3f277

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