diff options
Diffstat (limited to 'archival/libunarchive/unarchive.c')
| -rw-r--r-- | archival/libunarchive/unarchive.c | 241 |
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); +}
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