124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Copyright (C) tons of folks. Tracking down who wrote what
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* isn't something I'm going to worry about... If you wrote something
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* here, please feel free to acknowledge your work.
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*
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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 GNU
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* 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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* Based in part on code from sash, Copyright (c) 1999 by David I. Bell
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* Permission has been granted to redistribute this code under the GPL.
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*
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*/
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libbb.h"
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int seek_sub_file(FILE *in_file, file_headers_t *headers, const char *tar_gz_file)
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{
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/* find the headers for the specified .tar.gz file */
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while (headers != NULL) {
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if (strcmp(headers->name, tar_gz_file) == 0) {
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fseek(in_file, headers->offset, SEEK_SET);
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return(EXIT_SUCCESS);
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}
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headers = headers->next;
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}
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return(EXIT_FAILURE);
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}
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/*
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* The contents of argument depend on the value of function.
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* It is either a dir name or a control file or field name(see dpkg_deb.c)
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*/
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char *deb_extract(const char *package_filename, FILE *out_stream, const int extract_function,
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const char *prefix, const char *filename)
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{
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FILE *deb_stream, *uncompressed_stream;
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file_headers_t *ar_headers = NULL;
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file_headers_t *tar_headers = NULL;
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file_headers_t *list_ptr;
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file_headers_t *deb_extract_list = (file_headers_t *) calloc(1, sizeof(file_headers_t));
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char *ared_file = NULL;
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char *output_buffer = NULL;
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int gunzip_pid;
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if (extract_function & extract_control_tar_gz) {
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ared_file = xstrdup("control.tar.gz");
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}
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else if (extract_function & extract_data_tar_gz) {
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ared_file = xstrdup("data.tar.gz");
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}
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/* open the debian package to be worked on */
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deb_stream = wfopen(package_filename, "r");
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ar_headers = (file_headers_t *) xmalloc(sizeof(file_headers_t));
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/* get a linked list of all ar entries */
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ar_headers = get_ar_headers(deb_stream);
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if (ar_headers == NULL) {
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error_msg("Couldnt get ar headers\n");
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return(NULL);
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}
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/* seek to the start of the .tar.gz file within the ar file*/
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fseek(deb_stream, 0, SEEK_SET);
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if (seek_sub_file(deb_stream, ar_headers, ared_file) == EXIT_FAILURE) {
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error_msg("Couldnt seek to file %s", ared_file);
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}
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/* get a linked list of all tar entries */
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tar_headers = get_tar_gz_headers(deb_stream);
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if (tar_headers == NULL) {
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error_msg("Couldnt get tar headers\n");
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return(NULL);
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}
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if (extract_function & extract_one_to_buffer) {
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list_ptr = tar_headers;
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while (list_ptr != NULL) {
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if (strcmp(filename, list_ptr->name) == 0) {
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deb_extract_list = append_archive_list(deb_extract_list, list_ptr);
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break;
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}
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list_ptr = list_ptr->next;
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}
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} else {
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deb_extract_list = tar_headers;
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}
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/* seek to the start of the .tar.gz file within the ar file*/
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if (seek_sub_file(deb_stream, ar_headers, ared_file) == EXIT_FAILURE) {
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error_msg("Couldnt seek to ar file");
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}
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/* open a stream of decompressed data */
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uncompressed_stream = fdopen(gz_open(deb_stream, &gunzip_pid), "r");
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output_buffer = extract_archive(uncompressed_stream, out_stream, deb_extract_list, extract_function, prefix);
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gz_close(gunzip_pid);
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fclose(deb_stream);
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fclose(uncompressed_stream);
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free(ared_file);
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return(output_buffer);
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} |