From 17822cd60aaf9333a9895494edcf03a0037de54c Mon Sep 17 00:00:00 2001 From: Glenn L McGrath Date: Wed, 13 Jun 2001 07:34:03 +0000 Subject: Reorganise unarchive functions, new files, removed some --- libbb/extract_archive.c | 132 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 132 insertions(+) create mode 100644 libbb/extract_archive.c (limited to 'libbb/extract_archive.c') 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 +#include +#include +#include +#include +#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); +} + -- cgit v1.1