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