1 files changed, 198 insertions, 0 deletions

diff --git a/busybox/archival/gunzip.c b/busybox/archival/gunzip.c
new file mode 100644
index 000000000..beb7bd12e
--- /dev/null
+++ b/busybox/archival/gunzip.c
@@ -0,0 +1,198 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * 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>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ *
+ * 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 0
+static char *license_msg[] = {
+        "   Copyright (C) 1992-1993 Jean-loup Gailly",
+        "   This program is free software; you can redistribute it and/or modify",
+        "   it under the terms of the GNU General Public License as published by",
+        "   the Free Software Foundation; either version 2, or (at your option)",
+        "   any later version.",
+        "",
+        "   This program is distributed in the hope that it will be useful,",
+        "   but WITHOUT ANY WARRANTY; without even the implied warranty of",
+        "   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the",
+        "   GNU General Public License for more details.",
+        "",
+        "   You should have received a copy of the GNU General Public License",
+        "   along with this program; if not, write to the Free Software",
+        "   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.",
+        0
+};
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "busybox.h"
+#include "unarchive.h"
+
+#define GUNZIP_OPT_STDOUT       1
+#define GUNZIP_OPT_FORCE        2
+#define GUNZIP_OPT_TEST         4
+#define GUNZIP_OPT_DECOMPRESS   8
+
+extern int gunzip_main(int argc, char **argv)
+{
+        char status = EXIT_SUCCESS;
+        unsigned long opt;
+
+        opt = bb_getopt_ulflags(argc, argv, "cftd");
+        /* if called as zcat */
+        if (strcmp(bb_applet_name, "zcat") == 0) {
+                opt |= GUNZIP_OPT_STDOUT;
+        }
+
+        do {
+                struct stat stat_buf;
+                const char *old_path = argv[optind];
+                const char *delete_path = NULL;
+                char *new_path = NULL;
+                int src_fd;
+                int dst_fd;
+
+                optind++;
+
+                if (old_path == NULL || strcmp(old_path, "-") == 0) {
+                        src_fd = STDIN_FILENO;
+                        opt |= GUNZIP_OPT_STDOUT;
+                } else {
+                        src_fd = bb_xopen(old_path, O_RDONLY);
+
+                        /* Get the time stamp on the input file. */
+                        if (stat(old_path, &stat_buf) < 0) {
+                                bb_error_msg_and_die("Couldn't stat file %s", old_path);
+                        }
+                }
+
+                /* Check that the input is sane.  */
+                if (isatty(src_fd) && ((opt & GUNZIP_OPT_FORCE) == 0)) {
+                        bb_error_msg_and_die
+                                ("compressed data not read from terminal.  Use -f to force it.");
+                }
+
+                /* Set output filename and number */
+                if (opt & GUNZIP_OPT_TEST) {
+                        dst_fd = bb_xopen("/dev/null", O_WRONLY);       /* why does test use filenum 2 ? */
+                } else if (opt & GUNZIP_OPT_STDOUT) {
+                        dst_fd = STDOUT_FILENO;
+                } else {
+                        char *extension;
+
+                        new_path = bb_xstrdup(old_path);
+
+                        extension = strrchr(new_path, '.');
+#ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS
+                        if (extension && (strcmp(extension, ".Z") == 0)) {
+                                *extension = '\0';
+                        } else
+#endif
+                        if (extension && (strcmp(extension, ".gz") == 0)) {
+                                *extension = '\0';
+                        } else if (extension && (strcmp(extension, ".tgz") == 0)) {
+                                extension[2] = 'a';
+                                extension[3] = 'r';
+                        } else {
+                                bb_error_msg_and_die("Invalid extension");
+                        }
+
+                        /* Open output file */
+                        dst_fd = bb_xopen(new_path, O_WRONLY | O_CREAT);
+
+                        /* Set permissions on the file */
+                        chmod(new_path, stat_buf.st_mode);
+
+                        /* If unzip succeeds remove the old file */
+                        delete_path = old_path;
+                }
+
+                /* do the decompression, and cleanup */
+                if (bb_xread_char(src_fd) == 0x1f) {
+                        unsigned char magic2;
+
+                        magic2 = bb_xread_char(src_fd);
+#ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS
+                        if (magic2 == 0x9d) {
+                                status = uncompress(src_fd, dst_fd);
+                        } else
+#endif
+                                if (magic2 == 0x8b) {
+                                        check_header_gzip(src_fd);
+                                        status = inflate_gunzip(src_fd, dst_fd);
+                                        if (status != 0) {
+                                                bb_error_msg_and_die("Error inflating");
+                                        }
+                                } else {
+                                        bb_error_msg_and_die("Invalid magic");
+                                }
+                } else {
+                        bb_error_msg_and_die("Invalid magic");
+                }
+
+                if ((status != EXIT_SUCCESS) && (new_path)) {
+                        /* Unzip failed, remove new path instead of old path */
+                        delete_path = new_path;
+                }
+
+                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(new_path);
+
+        } while (optind < argc);
+
+        return status;
+}