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-rw-r--r--libbb/get_ar_headers.c118
-rw-r--r--libbb/libbb.h12
2 files changed, 130 insertions, 0 deletions
diff --git a/libbb/get_ar_headers.c b/libbb/get_ar_headers.c
new file mode 100644
index 0000000..cf7de5c
--- /dev/null
+++ b/libbb/get_ar_headers.c
@@ -0,0 +1,118 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) tons of folks. Tracking down who wrote what
+ * isn't something I'm going to worry about... If you wrote something
+ * here, please feel free to acknowledge your work.
+ *
+ * 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
+ *
+ * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
+ * Permission has been granted to redistribute this code under the GPL.
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "libbb.h"
+
+extern ar_headers_t get_ar_headers(int srcFd)
+{
+ typedef struct raw_ar_header_s { /* Byte Offset */
+ char name[16]; /* 0-15 */
+ char date[12]; /* 16-27 */
+ char uid[6];
+ char gid[6]; /* 28-39 */
+ char mode[8]; /* 40-47 */
+ char size[10]; /* 48-57 */
+ char fmag[2]; /* 58-59 */
+ } raw_ar_header_t;
+
+ raw_ar_header_t raw_ar_header;
+
+ ar_headers_t *head, *entry;
+ char ar_magic[8];
+ char *long_name=NULL;
+
+ head = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));
+ entry = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));
+
+ /* check ar magic */
+ if (full_read(srcFd, ar_magic, 8) != 8) {
+ error_msg_and_die("cannot read magic");
+ }
+
+ if (strncmp(ar_magic,"!<arch>",7) != 0) {
+ error_msg_and_die("invalid magic");
+ }
+
+ while (full_read(srcFd, (char *) &raw_ar_header, 60)==60) {
+ /* check the end of header markers are valid */
+ if ((raw_ar_header.fmag[0]!='`') || (raw_ar_header.fmag[1]!='\n')) {
+ char newline;
+ if (raw_ar_header.fmag[1]!='`') {
+ break;
+ }
+ /* some version of ar, have an extra '\n' after each entry */
+ read(srcFd, &newline, 1);
+ if (newline!='\n') {
+ break;
+ }
+ /* fix up the header, we started reading 1 byte too early due to a '\n' */
+ memmove((char *) &raw_ar_header, (char *)&raw_ar_header+1, 59);
+ /* dont worry about adding the last '\n', we dont need it now */
+ }
+
+ entry->size = (off_t) atoi(raw_ar_header.size);
+ /* long filenames have '/' as the first character */
+ if (raw_ar_header.name[0] == '/') {
+ if (raw_ar_header.name[1] == '/') {
+ /* multiple long filenames are stored as data in one entry */
+ long_name = (char *) xrealloc(long_name, entry->size);
+ full_read(srcFd, long_name, entry->size);
+ continue;
+ }
+ else {
+ /* The number after the '/' indicates the offset in the ar data section
+ (saved in variable long_name) that conatains the real filename */
+ const int long_name_offset = (int) atoi((char *) &raw_ar_header.name[1]);
+ entry->name = xmalloc(strlen(&long_name[long_name_offset]));
+ strcpy(entry->name, &long_name[long_name_offset]);
+ }
+ }
+ else {
+ /* short filenames */
+ entry->name = xmalloc(16);
+ strncpy(entry->name, raw_ar_header.name, 16);
+ }
+ entry->name[strcspn(entry->name, " /")]='\0';
+
+ /* convert the rest of the now valid char header to its typed struct */
+ parse_mode(raw_ar_header.mode, &entry->mode);
+ entry->mtime = atoi(raw_ar_header.date);
+ entry->uid = atoi(raw_ar_header.uid);
+ entry->gid = atoi(raw_ar_header.gid);
+ entry->offset = lseek(srcFd, 0, SEEK_CUR);
+
+ /* add this entries header to our combined list */
+ entry->next = (ar_headers_t *) xmalloc(sizeof(ar_headers_t));
+ *entry->next = *head;
+ *head = *entry;
+ lseek(srcFd, (off_t) entry->size, SEEK_CUR);
+ }
+ return(*head);
+} \ No newline at end of file
diff --git a/libbb/libbb.h b/libbb/libbb.h
index 6133b19..649fe11 100644
--- a/libbb/libbb.h
+++ b/libbb/libbb.h
@@ -215,4 +215,16 @@ int klogctl(int type, char * b, int len);
char *xgetcwd(char *cwd);
char *concat_path_file(const char *path, const char *filename);
+typedef struct ar_headers_s {
+ char *name;
+ off_t size;
+ uid_t uid;
+ gid_t gid;
+ mode_t mode;
+ time_t mtime;
+ off_t offset;
+ struct ar_headers_s *next;
+} ar_headers_t;
+extern ar_headers_t get_ar_headers(int srcFd);
+
#endif /* __LIBBB_H__ */