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/* 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 <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#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 = bb_getopt_ulflags(argc, argv, "cf");
while (optind < argc) {
const char *compressed_file = argv[optind++];
const 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 = bb_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 = bb_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 = bb_xopen3(uncompressed_file, O_WRONLY | O_CREAT,
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("Couldn't remove %s", delete_path);
}
free(uncompressed_file);
}
return status;
}
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