| 1 | /* vi: set sw=4 ts=4: */
|
|---|
| 2 | /*
|
|---|
| 3 | * Uncompress applet for busybox (c) 2002 Glenn McGrath
|
|---|
| 4 | *
|
|---|
| 5 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
|---|
| 6 | */
|
|---|
| 7 |
|
|---|
| 8 | #include <stdlib.h>
|
|---|
| 9 | #include <string.h>
|
|---|
| 10 | #include <unistd.h>
|
|---|
| 11 | #include <sys/types.h>
|
|---|
| 12 | #include <sys/stat.h>
|
|---|
| 13 | #include <fcntl.h>
|
|---|
| 14 |
|
|---|
| 15 | #include "busybox.h"
|
|---|
| 16 | #include "unarchive.h"
|
|---|
| 17 |
|
|---|
| 18 | #define GUNZIP_TO_STDOUT 1
|
|---|
| 19 | #define GUNZIP_FORCE 2
|
|---|
| 20 |
|
|---|
| 21 | int uncompress_main(int argc, char **argv)
|
|---|
| 22 | {
|
|---|
| 23 | int status = EXIT_SUCCESS;
|
|---|
| 24 | unsigned long flags;
|
|---|
| 25 |
|
|---|
| 26 | flags = bb_getopt_ulflags(argc, argv, "cf");
|
|---|
| 27 |
|
|---|
| 28 | while (optind < argc) {
|
|---|
| 29 | const char *compressed_file = argv[optind++];
|
|---|
| 30 | const char *delete_path = NULL;
|
|---|
| 31 | char *uncompressed_file = NULL;
|
|---|
| 32 | int src_fd;
|
|---|
| 33 | int dst_fd;
|
|---|
| 34 |
|
|---|
| 35 | if (strcmp(compressed_file, "-") == 0) {
|
|---|
| 36 | src_fd = STDIN_FILENO;
|
|---|
| 37 | flags |= GUNZIP_TO_STDOUT;
|
|---|
| 38 | } else {
|
|---|
| 39 | src_fd = bb_xopen(compressed_file, O_RDONLY);
|
|---|
| 40 | }
|
|---|
| 41 |
|
|---|
| 42 | /* Check that the input is sane. */
|
|---|
| 43 | if (isatty(src_fd) && ((flags & GUNZIP_FORCE) == 0)) {
|
|---|
| 44 | bb_error_msg_and_die
|
|---|
| 45 | ("compressed data not read from terminal. Use -f to force it.");
|
|---|
| 46 | }
|
|---|
| 47 |
|
|---|
| 48 | /* Set output filename and number */
|
|---|
| 49 | if (flags & GUNZIP_TO_STDOUT) {
|
|---|
| 50 | dst_fd = STDOUT_FILENO;
|
|---|
| 51 | } else {
|
|---|
| 52 | struct stat stat_buf;
|
|---|
| 53 | char *extension;
|
|---|
| 54 |
|
|---|
| 55 | uncompressed_file = bb_xstrdup(compressed_file);
|
|---|
| 56 |
|
|---|
| 57 | extension = strrchr(uncompressed_file, '.');
|
|---|
| 58 | if (!extension || (strcmp(extension, ".Z") != 0)) {
|
|---|
| 59 | bb_error_msg_and_die("Invalid extension");
|
|---|
| 60 | }
|
|---|
| 61 | *extension = '\0';
|
|---|
| 62 |
|
|---|
| 63 | /* Open output file */
|
|---|
| 64 | xstat(compressed_file, &stat_buf);
|
|---|
| 65 | dst_fd = bb_xopen3(uncompressed_file, O_WRONLY | O_CREAT,
|
|---|
| 66 | stat_buf.st_mode);
|
|---|
| 67 |
|
|---|
| 68 | /* If unzip succeeds remove the old file */
|
|---|
| 69 | delete_path = compressed_file;
|
|---|
| 70 | }
|
|---|
| 71 |
|
|---|
| 72 | /* do the decompression, and cleanup */
|
|---|
| 73 | if ((bb_xread_char(src_fd) != 0x1f) || (bb_xread_char(src_fd) != 0x9d)) {
|
|---|
| 74 | bb_error_msg_and_die("Invalid magic");
|
|---|
| 75 | }
|
|---|
| 76 |
|
|---|
| 77 | status = uncompress(src_fd, dst_fd);
|
|---|
| 78 |
|
|---|
| 79 | if ((status != EXIT_SUCCESS) && (uncompressed_file)) {
|
|---|
| 80 | /* Unzip failed, remove the uncomressed file instead of compressed file */
|
|---|
| 81 | delete_path = uncompressed_file;
|
|---|
| 82 | }
|
|---|
| 83 |
|
|---|
| 84 | if (dst_fd != STDOUT_FILENO) {
|
|---|
| 85 | close(dst_fd);
|
|---|
| 86 | }
|
|---|
| 87 | if (src_fd != STDIN_FILENO) {
|
|---|
| 88 | close(src_fd);
|
|---|
| 89 | }
|
|---|
| 90 |
|
|---|
| 91 | /* delete_path will be NULL if in test mode or from stdin */
|
|---|
| 92 | if (delete_path && (unlink(delete_path) == -1)) {
|
|---|
| 93 | bb_error_msg_and_die("Couldn't remove %s", delete_path);
|
|---|
| 94 | }
|
|---|
| 95 |
|
|---|
| 96 | free(uncompressed_file);
|
|---|
| 97 | }
|
|---|
| 98 |
|
|---|
| 99 | return status;
|
|---|
| 100 | }
|
|---|
