source: MondoRescue/branches/2.2.5/mindi-busybox/archival/bbunzip.c

/* vi: set sw=4 ts=4: */
/*
 *  Common code for gunzip-like applets
 *
 *  Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "libbb.h"
#include "unarchive.h"

enum {
    OPT_STDOUT = 0x1,
    OPT_FORCE = 0x2,
/* gunzip only: */
    OPT_VERBOSE = 0x4,
    OPT_DECOMPRESS = 0x8,
    OPT_TEST = 0x10,
};

static
int open_to_or_warn(int to_fd, const char *filename, int flags, int mode)
{
    int fd = open3_or_warn(filename, flags, mode);
    if (fd < 0) {
        return 1;
    }
    xmove_fd(fd, to_fd);
    return 0;
}

int bbunpack(char **argv,
    char* (*make_new_name)(char *filename),
    USE_DESKTOP(long long) int (*unpacker)(void)
)
{
    struct stat stat_buf;
    USE_DESKTOP(long long) int status;
    char *filename, *new_name;
    smallint exitcode = 0;

    do {
        /* NB: new_name is *maybe* malloc'ed! */
        new_name = NULL;
        filename = *argv; /* can be NULL - 'streaming' bunzip2 */

        if (filename && LONE_DASH(filename))
            filename = NULL;

        /* Open src */
        if (filename) {
            if (stat(filename, &stat_buf) != 0) {
                bb_perror_msg("%s", filename);
 err:
                exitcode = 1;
                goto free_name;
            }
            if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
                goto err;
        }

        /* Special cases: test, stdout */
        if (option_mask32 & (OPT_STDOUT|OPT_TEST)) {
            if (option_mask32 & OPT_TEST)
                if (open_to_or_warn(STDOUT_FILENO, bb_dev_null, O_WRONLY, 0))
                    goto err;
            filename = NULL;
        }

        /* Open dst if we are going to unpack to file */
        if (filename) {
            new_name = make_new_name(filename);
            if (!new_name) {
                bb_error_msg("%s: unknown suffix - ignored", filename);
                goto err;
            }
            /* O_EXCL: "real" bunzip2 doesn't overwrite files */
            /* GNU gunzip goes not bail out, but goes to next file */
            if (open_to_or_warn(STDOUT_FILENO, new_name, O_WRONLY | O_CREAT | O_EXCL,
                    stat_buf.st_mode))
                goto err;
        }

        /* Check that the input is sane */
        if (isatty(STDIN_FILENO) && (option_mask32 & OPT_FORCE) == 0) {
            bb_error_msg_and_die("compressed data not read from terminal, "
                    "use -f to force it");
        }

        status = unpacker();
        if (status < 0)
            exitcode = 1;

        if (filename) {
            char *del = new_name;
            if (status >= 0) {
                /* TODO: restore user/group/times here? */
                /* Delete _compressed_ file */
                del = filename;
                /* restore extension (unless tgz -> tar case) */
                if (new_name == filename)
                    filename[strlen(filename)] = '.';
            }
            xunlink(del);

#if 0 /* Currently buggy - wrong name: "a.gz: 261% - replaced with a.gz" */
            /* Extreme bloat for gunzip compat */
            if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE) && status >= 0) {
                fprintf(stderr, "%s: %u%% - replaced with %s\n",
                    filename, (unsigned)(stat_buf.st_size*100 / (status+1)), new_name);
            }
#endif

 free_name:
            if (new_name != filename)
                free(new_name);
        }
    } while (*argv && *++argv);

    return exitcode;
}

#if ENABLE_BUNZIP2 || ENABLE_UNLZMA || ENABLE_UNCOMPRESS

static
char* make_new_name_generic(char *filename, const char *expected_ext)
{
    char *extension = strrchr(filename, '.');
    if (!extension || strcmp(extension + 1, expected_ext) != 0) {
        /* Mimic GNU gunzip - "real" bunzip2 tries to */
        /* unpack file anyway, to file.out */
        return NULL;
    }
    *extension = '\0';
    return filename;
}

#endif


/*
 *  Modified for busybox by Glenn McGrath <bug1@iinet.net.au>
 *  Added support output to stdout by Thomas Lundquist <thomasez@zelow.no>
 *
 *  Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#if ENABLE_BUNZIP2

static
char* make_new_name_bunzip2(char *filename)
{
    return make_new_name_generic(filename, "bz2");
}

static
USE_DESKTOP(long long) int unpack_bunzip2(void)
{
    return unpack_bz2_stream(STDIN_FILENO, STDOUT_FILENO);
}

int bunzip2_main(int argc, char **argv);
int bunzip2_main(int argc, char **argv)
{
    getopt32(argv, "cf");
    argv += optind;
    if (applet_name[2] == 'c')
        option_mask32 |= OPT_STDOUT;

    return bbunpack(argv, make_new_name_bunzip2, unpack_bunzip2);
}

#endif


/*
 * Gzip implementation for busybox
 *
 * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
 *
 * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
 * based on gzip sources
 *
 * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
 * well as stdin/stdout, and to generally behave itself wrt command line
 * handling.
 *
 * General cleanup to better adhere to the style guide and make use of standard
 * busybox functions by Glenn McGrath <bug1@iinet.net.au>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 *
 * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
 * Copyright (C) 1992-1993 Jean-loup Gailly
 * The unzip code was written and put in the public domain by Mark Adler.
 * Portions of the lzw code are derived from the public domain 'compress'
 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
 * Ken Turkowski, Dave Mack and Peter Jannesen.
 *
 * See the license_msg below and the file COPYING for the software license.
 * See the file algorithm.doc for the compression algorithms and file formats.
 */

#if ENABLE_GUNZIP

static
char* make_new_name_gunzip(char *filename)
{
    char *extension = strrchr(filename, '.');

    if (!extension)
        return NULL;

    extension++;
    if (strcmp(extension, "tgz" + 1) == 0
#if ENABLE_FEATURE_GUNZIP_UNCOMPRESS
     || strcmp(extension, "Z") == 0
#endif
    ) {
        extension[-1] = '\0';
    } else if (strcmp(extension, "tgz") == 0) {
        filename = xstrdup(filename);
        extension = strrchr(filename, '.');
        extension[2] = 'a';
        extension[3] = 'r';
    } else {
        return NULL;
    }
    return filename;
}

static
USE_DESKTOP(long long) int unpack_gunzip(void)
{
    USE_DESKTOP(long long) int status = -1;

    /* do the decompression, and cleanup */
    if (xread_char(STDIN_FILENO) == 0x1f) {
        unsigned char magic2;

        magic2 = xread_char(STDIN_FILENO);
        if (ENABLE_FEATURE_GUNZIP_UNCOMPRESS && magic2 == 0x9d) {
            status = uncompress(STDIN_FILENO, STDOUT_FILENO);
        } else if (magic2 == 0x8b) {
            check_header_gzip_or_die(STDIN_FILENO);
            status = unpack_gz_stream(STDIN_FILENO, STDOUT_FILENO);
        } else {
            goto bad_magic;
        }
        if (status < 0) {
            bb_error_msg("error inflating");
        }
    } else {
 bad_magic:
        bb_error_msg("invalid magic");
        /* status is still == -1 */
    }
    return status;
}

int gunzip_main(int argc, char **argv);
int gunzip_main(int argc, char **argv)
{
    getopt32(argv, "cfvdt");
    argv += optind;
    /* if called as zcat */
    if (applet_name[1] == 'c')
        option_mask32 |= OPT_STDOUT;

    return bbunpack(argv, make_new_name_gunzip, unpack_gunzip);
}

#endif


/*
 * Small lzma deflate implementation.
 * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
 *
 * Based on bunzip.c from busybox
 *
 * Licensed under GPL v2, see file LICENSE in this tarball for details.
 */

#if ENABLE_UNLZMA

static
char* make_new_name_unlzma(char *filename)
{
    return make_new_name_generic(filename, "lzma");
}

static
USE_DESKTOP(long long) int unpack_unlzma(void)
{
    return unpack_lzma_stream(STDIN_FILENO, STDOUT_FILENO);
}

int unlzma_main(int argc, char **argv);
int unlzma_main(int argc, char **argv)
{
    getopt32(argv, "cf");
    argv += optind;
    /* lzmacat? */
    if (applet_name[4] == 'c')
        option_mask32 |= OPT_STDOUT;

    return bbunpack(argv, make_new_name_unlzma, unpack_unlzma);
}

#endif


/*
 *  Uncompress applet for busybox (c) 2002 Glenn McGrath
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#if ENABLE_UNCOMPRESS

static
char* make_new_name_uncompress(char *filename)
{
    return make_new_name_generic(filename, "Z");
}

static
USE_DESKTOP(long long) int unpack_uncompress(void)
{
    USE_DESKTOP(long long) int status = -1;

    if ((xread_char(STDIN_FILENO) != 0x1f) || (xread_char(STDIN_FILENO) != 0x9d)) {
        bb_error_msg("invalid magic");
    } else {
        status = uncompress(STDIN_FILENO, STDOUT_FILENO);
    }
    return status;
}

int uncompress_main(int argc, char **argv);
int uncompress_main(int argc, char **argv)
{
    getopt32(argv, "cf");
    argv += optind;

    return bbunpack(argv, make_new_name_uncompress, unpack_uncompress);
}

#endif