Move deb_extract() to libbb, dpkg now independent of dpkg-deb

2 files changed, 123 insertions, 1 deletions

diff --git a/libbb/deb_extract.c b/libbb/deb_extract.c
new file mode 100644
index 0000000..358c4d0
--- /dev/null
+++ b/libbb/deb_extract.c
@@ -0,0 +1,122 @@
+/* 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 <signal.h>
+#include "libbb.h"
+
+/* From gunzip.c */
+extern int gz_open(FILE *compressed_file, int *pid);
+extern void gz_close(int gunzip_pid);
+
+extern int tar_unzip_init(int tarFd);
+extern int readTarFile(int tarFd, int extractFlag, int listFlag, 
+	int tostdoutFlag, int verboseFlag, char** extractList, char** excludeList);
+
+extern int deb_extract(int optflags, const char *dir_name, const char *deb_filename)
+{
+	const int dpkg_deb_contents = 1;
+	const int dpkg_deb_control = 2;
+//	const int dpkg_deb_info = 4;
+	const int dpkg_deb_extract = 8;
+	const int dpkg_deb_verbose_extract = 16;
+	const int dpkg_deb_list = 32;
+
+	char **extract_list = NULL;
+	ar_headers_t *ar_headers = NULL;
+	char ar_filename[15];
+	int extract_flag = FALSE;
+	int list_flag = FALSE;
+	int verbose_flag = FALSE;
+	int extract_to_stdout = FALSE;
+	int srcFd = 0;
+	int status;
+	pid_t pid;
+	FILE *comp_file = NULL;
+
+	if (dpkg_deb_contents == (dpkg_deb_contents & optflags)) {
+		strcpy(ar_filename, "data.tar.gz");
+		verbose_flag = TRUE;
+		list_flag = TRUE;
+	}
+	if (dpkg_deb_list == (dpkg_deb_list & optflags)) {
+		strcpy(ar_filename, "data.tar.gz");
+		list_flag = TRUE;
+	}
+	if (dpkg_deb_control == (dpkg_deb_control & optflags)) {
+		strcpy(ar_filename, "control.tar.gz");	
+		extract_flag = TRUE;
+	}
+	if (dpkg_deb_extract == (dpkg_deb_extract & optflags)) {
+		strcpy(ar_filename, "data.tar.gz");
+		extract_flag = TRUE;
+	}
+	if (dpkg_deb_verbose_extract == (dpkg_deb_verbose_extract & optflags)) {
+		strcpy(ar_filename, "data.tar.gz");
+		extract_flag = TRUE;
+		list_flag = TRUE;
+	}
+
+	ar_headers = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));	
+	srcFd = open(deb_filename, O_RDONLY);
+	
+	*ar_headers = get_ar_headers(srcFd);
+	if (ar_headers->next == NULL) {
+		error_msg_and_die("Couldnt find %s in %s", ar_filename, deb_filename);
+	}
+
+	while (ar_headers->next != NULL) {
+		if (strcmp(ar_headers->name, ar_filename) == 0) {
+			break;
+		}
+		ar_headers = ar_headers->next;
+	}
+	lseek(srcFd, ar_headers->offset, SEEK_SET);
+	/* Uncompress the file */
+	comp_file = fdopen(srcFd, "r");
+	if ((srcFd = gz_open(comp_file, &pid)) == EXIT_FAILURE) {
+	    error_msg_and_die("Couldnt unzip file");
+	}
+	if ( dir_name != NULL) { 
+		if (is_directory(dir_name, TRUE, NULL)==FALSE) {
+			mkdir(dir_name, 0755);
+		}
+		if (chdir(dir_name)==-1) {
+			error_msg_and_die("Cannot change to dir %s", dir_name);
+		}
+	}
+	status = readTarFile(srcFd, extract_flag, list_flag, 
+		extract_to_stdout, verbose_flag, NULL, extract_list);
+
+	/* we are deliberately terminating the child so we can safely ignore this */
+	signal(SIGTERM, SIG_IGN);
+	gz_close(pid);
+	close(srcFd);
+	fclose(comp_file);
+
+	return status;
+}
\ No newline at end of file
diff --git a/libbb/libbb.h b/libbb/libbb.h
index 649fe11..06215d1 100644
--- a/libbb/libbb.h
+++ b/libbb/libbb.h
@@ -226,5 +226,5 @@ typedef struct ar_headers_s {
 	struct ar_headers_s *next;
 } ar_headers_t;
 extern ar_headers_t get_ar_headers(int srcFd);
-
+extern int deb_extract(int optflags, const char *dir_name, const char *deb_filename);
 #endif /* __LIBBB_H__ */