1 files changed, 94 insertions, 0 deletions
diff --git a/archival/uncompress.c b/archival/uncompress.c
new file mode 100644
index 000000000..3c78961d5
--- /dev/null
+++ b/archival/uncompress.c
@@ -0,0 +1,94 @@
+/* vi: set sw=4 ts=4: */
+/*
+ *	Uncompress applet for busybox (c) 2002 Glenn McGrath
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "busybox.h"
+#include "unarchive.h"
+
+#define GUNZIP_TO_STDOUT	1
+#define GUNZIP_FORCE	2
+
+int uncompress_main(int argc, char **argv)
+{
+	int status = EXIT_SUCCESS;
+	unsigned long flags;
+
+	flags = getopt32(argc, argv, "cf");
+
+	while (optind < argc) {
+		char *compressed_file = argv[optind++];
+		char *delete_path = NULL;
+		char *uncompressed_file = NULL;
+		int src_fd;
+		int dst_fd;
+
+		if (strcmp(compressed_file, "-") == 0) {
+			src_fd = STDIN_FILENO;
+			flags |= GUNZIP_TO_STDOUT;
+		} else {
+			src_fd = xopen(compressed_file, O_RDONLY);
+		}
+
+		/* Check that the input is sane.  */
+		if (isatty(src_fd) && ((flags & GUNZIP_FORCE) == 0)) {
+			bb_error_msg_and_die
+				("compressed data not read from terminal.  Use -f to force it.");
+		}
+
+		/* Set output filename and number */
+		if (flags & GUNZIP_TO_STDOUT) {
+			dst_fd = STDOUT_FILENO;
+		} else {
+			struct stat stat_buf;
+			char *extension;
+
+			uncompressed_file = xstrdup(compressed_file);
+
+			extension = strrchr(uncompressed_file, '.');
+			if (!extension || (strcmp(extension, ".Z") != 0)) {
+				bb_error_msg_and_die("invalid extension");
+			}
+			*extension = '\0';
+
+			/* Open output file */
+			xstat(compressed_file, &stat_buf);
+			dst_fd = xopen3(uncompressed_file,
+					O_WRONLY | O_CREAT | O_TRUNC,
+					stat_buf.st_mode);
+
+			/* If unzip succeeds remove the old file */
+			delete_path = compressed_file;
+		}
+
+		/* do the decompression, and cleanup */
+		if ((xread_char(src_fd) != 0x1f) || (xread_char(src_fd) != 0x9d)) {
+			bb_error_msg_and_die("invalid magic");
+		}
+
+		status = uncompress(src_fd, dst_fd);
+
+		if ((status != EXIT_SUCCESS) && (uncompressed_file)) {
+			/* Unzip failed, remove the uncomressed file instead of compressed file */
+			delete_path = uncompressed_file;
+		}
+
+		if (dst_fd != STDOUT_FILENO) {
+			close(dst_fd);
+		}
+		if (src_fd != STDIN_FILENO) {
+			close(src_fd);
+		}
+
+		/* delete_path will be NULL if in test mode or from stdin */
+		if (delete_path && (unlink(delete_path) == -1)) {
+			bb_error_msg_and_die("cannot remove %s", delete_path);
+		}
+
+		free(uncompressed_file);
+	}
+
+	return status;
+}