+ if (unsigned_sum == 0)
+ return HEADER_ZERO_BLOCK;
+
+ /* Adjust checksum to count the "chksum" field as blanks. */
+
+ for (i = sizeof header->header.chksum; i-- != 0;)
+ {
+ unsigned_sum -= (unsigned char) header->header.chksum[i];
+ signed_sum -= (signed char) (header->header.chksum[i]);
+ }
+ unsigned_sum += ' ' * sizeof header->header.chksum;
+ signed_sum += ' ' * sizeof header->header.chksum;
+
+ parsed_sum = from_header (header->header.chksum,
+ sizeof header->header.chksum, 0,
+ (uintmax_t) 0,
+ (uintmax_t) TYPE_MAXIMUM (int));
+ if (parsed_sum == (uintmax_t) -1)
+ return HEADER_FAILURE;
+
+ recorded_sum = parsed_sum;
+
+ if (unsigned_sum != recorded_sum && signed_sum != recorded_sum)
+ return HEADER_FAILURE;
+
+ /* Good block. Decode file size and return. */
+
+ if (header->header.typeflag == LNKTYPE)
+ current_stat_info.stat.st_size = 0; /* links 0 size on tape */
+ else
+ current_stat_info.stat.st_size = OFF_FROM_HEADER (header->header.size);
+
+ if (header->header.typeflag == GNUTYPE_LONGNAME
+ || header->header.typeflag == GNUTYPE_LONGLINK
+ || header->header.typeflag == XHDTYPE
+ || header->header.typeflag == XGLTYPE)
+ {
+ if (raw_extended_headers)
+ return HEADER_SUCCESS_EXTENDED;
+ else if (header->header.typeflag == GNUTYPE_LONGNAME
+ || header->header.typeflag == GNUTYPE_LONGLINK)
+ {
+ size_t name_size = current_stat_info.stat.st_size;
+ size = name_size - name_size % BLOCKSIZE + 2 * BLOCKSIZE;
+ if (name_size != current_stat_info.stat.st_size
+ || size < name_size)
+ xalloc_die ();
+
+ header_copy = xmalloc (size + 1);
+
+ if (header->header.typeflag == GNUTYPE_LONGNAME)
+ {
+ if (next_long_name)
+ free (next_long_name);
+ next_long_name = header_copy;
+ next_long_name_blocks = size / BLOCKSIZE;
+ }
+ else
+ {
+ if (next_long_link)
+ free (next_long_link);
+ next_long_link = header_copy;
+ next_long_link_blocks = size / BLOCKSIZE;
+ }
+
+ set_next_block_after (header);
+ *header_copy = *header;
+ bp = header_copy->buffer + BLOCKSIZE;
+
+ for (size -= BLOCKSIZE; size > 0; size -= written)
+ {
+ data_block = find_next_block ();
+ if (! data_block)
+ {
+ ERROR ((0, 0, _("Unexpected EOF in archive")));
+ break;
+ }
+ written = available_space_after (data_block);
+ if (written > size)
+ written = size;
+
+ memcpy (bp, data_block->buffer, written);
+ bp += written;
+ set_next_block_after ((union block *)
+ (data_block->buffer + written - 1));
+ }
+
+ *bp = '\0';
+ }
+ else if (header->header.typeflag == XHDTYPE
+ || header->header.typeflag == XGLTYPE)
+ xheader_read (header, OFF_FROM_HEADER (header->header.size));
+
+ /* Loop! */
+