*** empty log message ***

1 files changed, 241 insertions, 0 deletions

diff --git a/archival/libunarchive/unarchive.c b/archival/libunarchive/unarchive.c
new file mode 100644
index 0000000..4a42eaf
--- /dev/null
+++ b/archival/libunarchive/unarchive.c
@@ -0,0 +1,241 @@
+/*
+ *  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 Library 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.
+ */
+
+#include <errno.h>
+#include <fnmatch.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <utime.h>
+#include "unarchive.h"
+#include "libbb.h"
+
+/* Extract the data postioned at src_stream to either filesystem, stdout or 
+ * buffer depending on the value of 'function' which is defined in libbb.h 
+ *
+ * prefix doesnt have to be just a directory, it may prefix the filename as well.
+ *
+ * e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath 
+ * '/var/lib/dpkg/info/' and all files/dirs created in that dir will have 
+ * 'dpkg.' as their prefix
+ *
+ * For this reason if prefix does point to a dir then it must end with a
+ * trailing '/' or else the last dir will be assumed to be the file prefix 
+ */
+char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *file_entry,
+ const int function, const char *prefix)
+{
+	FILE *dst_stream = NULL;
+	char *full_name = NULL;
+	char *buffer = NULL;
+	struct utimbuf t;
+
+	/* prefix doesnt have to be a proper path it may prepend 
+	 * the filename as well */
+	if (prefix != NULL) {
+		/* strip leading '/' in filename to extract as prefix may not be dir */
+		/* Cant use concat_path_file here as prefix might not be a directory */
+		char *path = file_entry->name;
+		if (strncmp("./", path, 2) == 0) {
+			path += 2;
+			if (strlen(path) == 0) {
+				return(NULL);
+			}
+		}
+		full_name = xmalloc(strlen(prefix) + strlen(path) + 1);
+		strcpy(full_name, prefix);
+		strcat(full_name, path);
+	} else {
+		full_name = file_entry->name;
+	}
+	if (function & extract_to_stdout) {
+		if (S_ISREG(file_entry->mode)) {
+			copy_file_chunk(src_stream, out_stream, file_entry->size);			
+			archive_offset += file_entry->size;
+		}
+	}
+	else if (function & extract_one_to_buffer) { 
+		if (S_ISREG(file_entry->mode)) {
+			buffer = (char *) xmalloc(file_entry->size + 1);
+			fread(buffer, 1, file_entry->size, src_stream);
+			buffer[file_entry->size] = '\0';
+			archive_offset += file_entry->size;
+			return(buffer);
+		}
+	}
+	else if (function & extract_all_to_fs) {
+		struct stat oldfile;
+		int stat_res;
+		stat_res = lstat (full_name, &oldfile);
+		if (stat_res == 0) { /* The file already exists */
+			if ((function & extract_unconditional) || (oldfile.st_mtime < file_entry->mtime)) {
+				if (!S_ISDIR(oldfile.st_mode)) {
+					unlink(full_name); /* Directories might not be empty etc */
+				}
+			} else {
+				if ((function & extract_quiet) != extract_quiet) {
+					error_msg("%s not created: newer or same age file exists", file_entry->name);
+				}
+				seek_sub_file(src_stream, file_entry->size);
+				return (NULL);
+			}
+		}
+		if (function & extract_create_leading_dirs) { /* Create leading directories with default umask */
+			char *buf, *parent;
+			buf = xstrdup(full_name);
+			parent = dirname(buf);
+			if (make_directory (parent, -1, FILEUTILS_RECUR) != 0) {
+				if ((function & extract_quiet) != extract_quiet) {
+					error_msg("couldn't create leading directories");
+				}
+			}
+			free (buf);
+		}
+		switch(file_entry->mode & S_IFMT) {
+			case S_IFREG:
+				if (file_entry->link_name) { /* Found a cpio hard link */
+					if (link(file_entry->link_name, full_name) != 0) {
+						if ((function & extract_quiet) != extract_quiet) {
+							perror_msg("Cannot link from %s to '%s'",
+								file_entry->name, file_entry->link_name);
+						}
+					}
+				} else {
+					if ((dst_stream = wfopen(full_name, "w")) == NULL) {
+						seek_sub_file(src_stream, file_entry->size);
+						return NULL;
+					}
+					archive_offset += file_entry->size;
+					copy_file_chunk(src_stream, dst_stream, file_entry->size);			
+					fclose(dst_stream);
+				}
+				break;
+			case S_IFDIR:
+				if (stat_res != 0) {
+					if (mkdir(full_name, file_entry->mode) < 0) {
+						if ((function & extract_quiet) != extract_quiet) {
+							perror_msg("extract_archive: %s", full_name);
+						}
+					}
+				}
+				break;
+			case S_IFLNK:
+				if (symlink(file_entry->link_name, full_name) < 0) {
+					if ((function & extract_quiet) != extract_quiet) {
+						perror_msg("Cannot create symlink from %s to '%s'", file_entry->name, file_entry->link_name);
+					}
+					return NULL;
+				}
+				break;
+			case S_IFSOCK:
+			case S_IFBLK:
+			case S_IFCHR:
+			case S_IFIFO:
+				if (mknod(full_name, file_entry->mode, file_entry->device) == -1) {
+					if ((function & extract_quiet) != extract_quiet) {
+						perror_msg("Cannot create node %s", file_entry->name);
+					}
+					return NULL;
+				}
+				break;
+		}
+
+		/* Changing a symlink's properties normally changes the properties of the 
+		 * file pointed to, so dont try and change the date or mode, lchown does
+		 * does the right thing, but isnt available in older versions of libc */
+		if (S_ISLNK(file_entry->mode)) {
+#if (__GLIBC__ > 2) && (__GLIBC_MINOR__ > 1)
+			lchown(full_name, file_entry->uid, file_entry->gid);
+#endif
+		} else {
+			if (function & extract_preserve_date) {
+				t.actime = file_entry->mtime;
+				t.modtime = file_entry->mtime;
+				utime(full_name, &t);
+			}
+			chmod(full_name, file_entry->mode);
+			chown(full_name, file_entry->uid, file_entry->gid);
+		}
+	} else {
+		/* If we arent extracting data we have to skip it, 
+		 * if data size is 0 then then just do it anyway
+		 * (saves testing for it) */
+		seek_sub_file(src_stream, file_entry->size);
+	}
+
+	/* extract_list and extract_verbose_list can be used in conjunction
+	 * with one of the above four extraction functions, so do this seperately */
+	if (function & extract_verbose_list) {
+		fprintf(out_stream, "%s %d/%d %8d %s ", mode_string(file_entry->mode), 
+			file_entry->uid, file_entry->gid,
+			(int) file_entry->size, time_string(file_entry->mtime));
+	}
+	if ((function & extract_list) || (function & extract_verbose_list)){
+		/* fputs doesnt add a trailing \n, so use fprintf */
+		fprintf(out_stream, "%s\n", full_name);
+	}
+
+	free(full_name);
+
+	return(NULL); /* Maybe we should say if failed */
+}
+
+char *unarchive(FILE *src_stream, FILE *out_stream, file_header_t *(*get_headers)(FILE *),
+	const int extract_function, const char *prefix, char **include_name, char **exclude_name)
+{
+	file_header_t *file_entry;
+	int extract_flag = TRUE;
+	int i;
+	char *buffer = NULL;
+
+	archive_offset = 0;
+	while ((file_entry = get_headers(src_stream)) != NULL) {
+
+		if (include_name != NULL) {
+			extract_flag = FALSE;
+			for(i = 0; include_name[i] != 0; i++) {
+				if (fnmatch(include_name[i], file_entry->name, FNM_LEADING_DIR) == 0) {
+					extract_flag = TRUE;
+					break;
+				}
+			}
+		} else {
+			extract_flag = TRUE;
+		}
+
+		/* If the file entry is in the exclude list dont extract it */
+		if (exclude_name != NULL) {
+			for(i = 0; exclude_name[i] != 0; i++) {
+				if (fnmatch(exclude_name[i], file_entry->name, FNM_LEADING_DIR) == 0) {
+					extract_flag = FALSE;
+					break;
+				}
+			}
+		}
+
+		if (extract_flag == TRUE) {
+			buffer = extract_archive(src_stream, out_stream, file_entry, extract_function, prefix);
+		} else {
+			/* seek past the data entry */
+			seek_sub_file(src_stream, file_entry->size);
+		}
+		free(file_entry->name);
+		free(file_entry->link_name);
+		free(file_entry);
+	}
+	return(buffer);
+}
\ No newline at end of file