Reorganise unarchive functions, new files, removed some

1 files changed, 132 insertions, 0 deletions

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 <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <utime.h>
+#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);
+}
+