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-rw-r--r--archival/libunarchive/get_header_ar.c87
1 files changed, 50 insertions, 37 deletions
diff --git a/archival/libunarchive/get_header_ar.c b/archival/libunarchive/get_header_ar.c
index d476a9d24..e6d712d8d 100644
--- a/archival/libunarchive/get_header_ar.c
+++ b/archival/libunarchive/get_header_ar.c
@@ -7,10 +7,20 @@
#include "libbb.h"
#include "unarchive.h"
+static unsigned read_num(const char *str, int base)
+{
+ /* This code works because
+ * on misformatted numbers bb_strtou returns all-ones */
+ int err = bb_strtou(str, NULL, base);
+ if (err == -1)
+ bb_error_msg_and_die("invalid ar header");
+ return err;
+}
+
char FAST_FUNC get_header_ar(archive_handle_t *archive_handle)
{
- int err;
file_header_t *typed = archive_handle->file_header;
+ unsigned size;
union {
char raw[60];
struct {
@@ -49,57 +59,60 @@ char FAST_FUNC get_header_ar(archive_handle_t *archive_handle)
if (ar.formatted.magic[0] != '`' || ar.formatted.magic[1] != '\n')
bb_error_msg_and_die("invalid ar header");
- /* FIXME: more thorough routine would be in order here */
- /* (we have something like that in tar) */
- /* but for now we are lax. This code works because */
- /* on misformatted numbers bb_strtou returns all-ones */
- typed->mode = err = bb_strtou(ar.formatted.mode, NULL, 8);
- if (err == -1) bb_error_msg_and_die("invalid ar header");
- typed->mtime = err = bb_strtou(ar.formatted.date, NULL, 10);
- if (err == -1) bb_error_msg_and_die("invalid ar header");
- typed->uid = err = bb_strtou(ar.formatted.uid, NULL, 10);
- if (err == -1) bb_error_msg_and_die("invalid ar header");
- typed->gid = err = bb_strtou(ar.formatted.gid, NULL, 10);
- if (err == -1) bb_error_msg_and_die("invalid ar header");
- typed->size = err = bb_strtou(ar.formatted.size, NULL, 10);
- if (err == -1) bb_error_msg_and_die("invalid ar header");
+ /* FIXME: more thorough routine would be in order here
+ * (we have something like that in tar)
+ * but for now we are lax. */
+ typed->size = size = read_num(ar.formatted.size, 10);
- /* long filenames have '/' as the first character */
+ /* special filenames have '/' as the first character */
if (ar.formatted.name[0] == '/') {
+ if (ar.formatted.name[1] == ' ') {
+ /* This is the index of symbols in the file for compilers */
+ data_skip(archive_handle);
+ archive_handle->offset += size;
+ return get_header_ar(archive_handle); /* Return next header */
+ }
#if ENABLE_FEATURE_AR_LONG_FILENAMES
- unsigned long_offset;
-
if (ar.formatted.name[1] == '/') {
/* If the second char is a '/' then this entries data section
* stores long filename for multiple entries, they are stored
- * in static variable long_names for use in future entries */
- ar_long_name_size = typed->size;
- ar_long_names = xmalloc(ar_long_name_size);
- xread(archive_handle->src_fd, ar_long_names, ar_long_name_size);
- archive_handle->offset += ar_long_name_size;
- /* This ar entries data section only contained filenames for other records
- * they are stored in the static ar_long_names for future reference */
- return get_header_ar(archive_handle); /* Return next header */
+ * in static variable long_names for use in future entries
+ */
+ ar_long_name_size = size;
+ free(ar_long_names);
+ ar_long_names = xmalloc(size);
+ xread(archive_handle->src_fd, ar_long_names, size);
+ archive_handle->offset += size;
+ /* Return next header */
+ return get_header_ar(archive_handle);
}
+#else
+ bb_error_msg_and_die("long filenames not supported");
+#endif
+ }
+ /* Only size is always present, the rest may be missing in
+ * long filename pseudo file. Thus we decode the rest
+ * after dealing with long filename pseudo file.
+ */
+ typed->mode = read_num(ar.formatted.mode, 8);
+ typed->mtime = read_num(ar.formatted.date, 10);
+ typed->uid = read_num(ar.formatted.uid, 10);
+ typed->gid = read_num(ar.formatted.gid, 10);
- if (ar.formatted.name[1] == ' ') {
- /* This is the index of symbols in the file for compilers */
- data_skip(archive_handle);
- archive_handle->offset += typed->size;
- return get_header_ar(archive_handle); /* Return next header */
- }
+#if ENABLE_FEATURE_AR_LONG_FILENAMES
+ if (ar.formatted.name[0] == '/') {
+ unsigned long_offset;
/* The number after the '/' indicates the offset in the ar data section
- * (saved in variable long_name) that conatains the real filename */
- long_offset = atoi(&ar.formatted.name[1]);
+ * (saved in ar_long_names) that conatains the real filename */
+ long_offset = read_num(&ar.formatted.name[1], 10);
if (long_offset >= ar_long_name_size) {
bb_error_msg_and_die("can't resolve long filename");
}
typed->name = xstrdup(ar_long_names + long_offset);
-#else
- bb_error_msg_and_die("long filenames not supported");
+ } else
#endif
- } else {
+ {
/* short filenames */
typed->name = xstrndup(ar.formatted.name, 16);
}