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authorDenys Vlasenko2010-11-03 02:38:31 +0100
committerDenys Vlasenko2010-11-03 02:38:31 +0100
commit833d4e7f84f59099ee66eabfa3457ebb7d37eaa8 (patch)
tree3be84e1049707ce8077291065fe3689497c69b9c /archival/libarchive/get_header_ar.c
parent5e9934028aa030312a1a2e2e32d5ceade8672beb (diff)
downloadbusybox-833d4e7f84f59099ee66eabfa3457ebb7d37eaa8.zip
busybox-833d4e7f84f59099ee66eabfa3457ebb7d37eaa8.tar.gz
rename archival/libunarchive -> archival/libarchive; move bz/ into it
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'archival/libarchive/get_header_ar.c')
-rw-r--r--archival/libarchive/get_header_ar.c133
1 files changed, 133 insertions, 0 deletions
diff --git a/archival/libarchive/get_header_ar.c b/archival/libarchive/get_header_ar.c
new file mode 100644
index 0000000..df603b1
--- /dev/null
+++ b/archival/libarchive/get_header_ar.c
@@ -0,0 +1,133 @@
+/* vi: set sw=4 ts=4: */
+/* Copyright 2001 Glenn McGrath.
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+#include "libbb.h"
+#include "archive.h"
+#include "ar.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)
+{
+ file_header_t *typed = archive_handle->file_header;
+ unsigned size;
+ union {
+ char raw[60];
+ struct ar_header formatted;
+ } ar;
+#if ENABLE_FEATURE_AR_LONG_FILENAMES
+ static char *ar_long_names;
+ static unsigned ar_long_name_size;
+#endif
+
+ /* dont use xread as we want to handle the error ourself */
+ if (read(archive_handle->src_fd, ar.raw, 60) != 60) {
+ /* End Of File */
+ return EXIT_FAILURE;
+ }
+
+ /* ar header starts on an even byte (2 byte aligned)
+ * '\n' is used for padding
+ */
+ if (ar.raw[0] == '\n') {
+ /* fix up the header, we started reading 1 byte too early */
+ memmove(ar.raw, &ar.raw[1], 59);
+ ar.raw[59] = xread_char(archive_handle->src_fd);
+ archive_handle->offset++;
+ }
+ archive_handle->offset += 60;
+
+ 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. */
+ ar.formatted.magic[0] = '\0'; /* else 4G-2 file will have size="4294967294`\n..." */
+ typed->size = size = read_num(ar.formatted.size, 10);
+
+ /* 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
+ 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 = 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 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 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
+#endif
+ {
+ /* short filenames */
+ typed->name = xstrndup(ar.formatted.name, 16);
+ }
+
+ typed->name[strcspn(typed->name, " /")] = '\0';
+
+ if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
+ archive_handle->action_header(typed);
+#if ENABLE_DPKG || ENABLE_DPKG_DEB
+ if (archive_handle->dpkg__sub_archive) {
+ while (archive_handle->dpkg__action_data_subarchive(archive_handle->dpkg__sub_archive) == EXIT_SUCCESS)
+ continue;
+ } else
+#endif
+ archive_handle->action_data(archive_handle);
+ } else {
+ data_skip(archive_handle);
+ }
+
+ archive_handle->offset += typed->size;
+ /* Set the file pointer to the correct spot, we may have been reading a compressed file */
+ lseek(archive_handle->src_fd, archive_handle->offset, SEEK_SET);
+
+ return EXIT_SUCCESS;
+}