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    Contents of /trunk/mkinitrd-magellan/busybox/archival/gunzip.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 4580 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * Gzip implementation for busybox
    4 *
    5 * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
    6 *
    7 * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
    8 * based on gzip sources
    9 *
    10 * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
    11 * well as stdin/stdout, and to generally behave itself wrt command line
    12 * handling.
    13 *
    14 * General cleanup to better adhere to the style guide and make use of standard
    15 * busybox functions by Glenn McGrath <bug1@iinet.net.au>
    16 *
    17 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    18 *
    19 * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
    20 * Copyright (C) 1992-1993 Jean-loup Gailly
    21 * The unzip code was written and put in the public domain by Mark Adler.
    22 * Portions of the lzw code are derived from the public domain 'compress'
    23 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
    24 * Ken Turkowski, Dave Mack and Peter Jannesen.
    25 *
    26 * See the license_msg below and the file COPYING for the software license.
    27 * See the file algorithm.doc for the compression algorithms and file formats.
    28 */
    29
    30 #include "busybox.h"
    31 #include "unarchive.h"
    32
    33 #define GUNZIP_OPT_STDOUT 1
    34 #define GUNZIP_OPT_FORCE 2
    35 #define GUNZIP_OPT_TEST 4
    36 #define GUNZIP_OPT_DECOMPRESS 8
    37 #define GUNZIP_OPT_VERBOSE 0x10
    38
    39 int gunzip_main(int argc, char **argv)
    40 {
    41 USE_DESKTOP(long long) int status;
    42 int exitcode = 0;
    43 unsigned opt;
    44
    45 opt = getopt32(argc, argv, "cftdv");
    46 /* if called as zcat */
    47 if (strcmp(applet_name, "zcat") == 0) {
    48 opt |= GUNZIP_OPT_STDOUT;
    49 }
    50
    51 do {
    52 struct stat stat_buf;
    53 char *old_path = argv[optind];
    54 char *delete_path = NULL;
    55 char *new_path = NULL;
    56 int src_fd;
    57 int dst_fd;
    58
    59 optind++;
    60
    61 if (old_path == NULL || LONE_DASH(old_path)) {
    62 src_fd = STDIN_FILENO;
    63 opt |= GUNZIP_OPT_STDOUT;
    64 USE_DESKTOP(opt &= ~GUNZIP_OPT_VERBOSE;)
    65 optind = argc; /* we don't handle "gunzip - a.gz b.gz" */
    66 } else {
    67 src_fd = xopen(old_path, O_RDONLY);
    68 /* Get the time stamp on the input file. */
    69 fstat(src_fd, &stat_buf);
    70 }
    71
    72 /* Check that the input is sane. */
    73 if (isatty(src_fd) && !(opt & GUNZIP_OPT_FORCE)) {
    74 bb_error_msg_and_die
    75 ("compressed data not read from terminal, use -f to force it");
    76 }
    77
    78 /* Set output filename and number */
    79 if (opt & GUNZIP_OPT_TEST) {
    80 dst_fd = xopen(bb_dev_null, O_WRONLY); /* why does test use filenum 2 ? */
    81 } else if (opt & GUNZIP_OPT_STDOUT) {
    82 dst_fd = STDOUT_FILENO;
    83 } else {
    84 char *extension;
    85
    86 new_path = xstrdup(old_path);
    87
    88 extension = strrchr(new_path, '.');
    89 #ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS
    90 if (extension && (strcmp(extension, ".Z") == 0)) {
    91 *extension = '\0';
    92 } else
    93 #endif
    94 if (extension && (strcmp(extension, ".gz") == 0)) {
    95 *extension = '\0';
    96 } else if (extension && (strcmp(extension, ".tgz") == 0)) {
    97 extension[2] = 'a';
    98 extension[3] = 'r';
    99 } else {
    100 // FIXME: should we die or just skip to next?
    101 bb_error_msg_and_die("invalid extension");
    102 }
    103
    104 /* Open output file (with correct permissions) */
    105 dst_fd = xopen3(new_path, O_WRONLY | O_CREAT | O_TRUNC,
    106 stat_buf.st_mode);
    107
    108 /* If unzip succeeds remove the old file */
    109 delete_path = old_path;
    110 }
    111
    112 status = -1;
    113 /* do the decompression, and cleanup */
    114 if (xread_char(src_fd) == 0x1f) {
    115 unsigned char magic2;
    116
    117 magic2 = xread_char(src_fd);
    118 if (ENABLE_FEATURE_GUNZIP_UNCOMPRESS && magic2 == 0x9d) {
    119 status = uncompress(src_fd, dst_fd);
    120 } else if (magic2 == 0x8b) {
    121 check_header_gzip(src_fd); // FIXME: xfunc? _or_die?
    122 status = inflate_gunzip(src_fd, dst_fd);
    123 } else {
    124 bb_error_msg("invalid magic");
    125 exitcode = 1;
    126 }
    127 if (status < 0) {
    128 bb_error_msg("error inflating");
    129 exitcode = 1;
    130 }
    131 else if (ENABLE_DESKTOP && (opt & GUNZIP_OPT_VERBOSE)) {
    132 fprintf(stderr, "%s: %u%% - replaced with %s\n",
    133 old_path, (unsigned)(stat_buf.st_size*100 / (status+1)), new_path);
    134 }
    135 } else {
    136 bb_error_msg("invalid magic");
    137 exitcode = 1;
    138 }
    139 if (status < 0 && new_path) {
    140 /* Unzip failed, remove new path instead of old path */
    141 delete_path = new_path;
    142 }
    143
    144 if (dst_fd != STDOUT_FILENO) {
    145 close(dst_fd);
    146 }
    147 if (src_fd != STDIN_FILENO) {
    148 close(src_fd);
    149 }
    150
    151 /* delete_path will be NULL if in test mode or from stdin */
    152 if (delete_path && (unlink(delete_path) == -1)) {
    153 bb_error_msg("cannot remove %s", delete_path);
    154 exitcode = 1;
    155 }
    156
    157 free(new_path);
    158
    159 } while (optind < argc);
    160
    161 return exitcode;
    162 }