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