+ case XGLTYPE:
+ {
+ tar_stat_init (&dummy);
+ if (read_header (&header, &dummy, read_header_x_global)
+ != HEADER_SUCCESS_EXTENDED)
+ {
+ ERROR ((0, 0, _("This does not look like a tar archive")));
+ return false;
+ }
+
+ xheader_decode (&dummy); /* decodes values from the global header */
+ tar_stat_destroy (&dummy);
+
+ /* The initial global header must be immediately followed by
+ an extended PAX header for the first member in this volume.
+ However, in some cases tar may split volumes in the middle
+ of a PAX header. This is incorrect, and should be fixed
+ in the future versions. In the meantime we must be
+ prepared to correctly list and extract such archives.
+
+ If this happens, the following call to read_header returns
+ HEADER_FAILURE, which is ignored.
+
+ See also tests/multiv07.at */
+
+ switch (read_header (&header, &dummy, read_header_auto))
+ {
+ case HEADER_SUCCESS:
+ set_next_block_after (header);
+ break;
+
+ case HEADER_FAILURE:
+ break;
+
+ default:
+ ERROR ((0, 0, _("This does not look like a tar archive")));
+ return false;
+ }
+ break;
+ }
+
+ case GNUTYPE_VOLHDR:
+ if (!read_header0 (&dummy))
+ return false;
+ tar_stat_destroy (&dummy);
+ assign_string (&volume_label, current_header->header.name);
+ set_next_block_after (header);
+ header = find_next_block ();
+ if (header->header.typeflag != GNUTYPE_MULTIVOL)
+ break;
+ /* FALL THROUGH */
+
+ case GNUTYPE_MULTIVOL:
+ if (!read_header0 (&dummy))
+ return false;
+ tar_stat_destroy (&dummy);
+ assign_string (&continued_file_name, current_header->header.name);
+ continued_file_size =
+ UINTMAX_FROM_HEADER (current_header->header.size);
+ continued_file_offset =
+ UINTMAX_FROM_HEADER (current_header->oldgnu_header.offset);
+ break;
+
+ default:
+ break;
+ }
+
+ if (bufmap_head)
+ {
+ uintmax_t s;
+ if (!continued_file_name
+ || strcmp (continued_file_name, bufmap_head->file_name))
+ {
+ if ((archive_format == GNU_FORMAT || archive_format == OLDGNU_FORMAT)
+ && strlen (bufmap_head->file_name) >= NAME_FIELD_SIZE
+ && strncmp (continued_file_name, bufmap_head->file_name,
+ NAME_FIELD_SIZE) == 0)
+ WARN ((0, 0,
+ _("%s is possibly continued on this volume: header contains truncated name"),
+ quote (bufmap_head->file_name)));
+ else
+ {
+ WARN ((0, 0, _("%s is not continued on this volume"),
+ quote (bufmap_head->file_name)));
+ return false;
+ }
+ }
+
+ s = continued_file_size + continued_file_offset;
+
+ if (bufmap_head->sizetotal != s || s < continued_file_offset)
+ {
+ char totsizebuf[UINTMAX_STRSIZE_BOUND];
+ char s1buf[UINTMAX_STRSIZE_BOUND];
+ char s2buf[UINTMAX_STRSIZE_BOUND];
+
+ WARN ((0, 0, _("%s is the wrong size (%s != %s + %s)"),
+ quote (continued_file_name),
+ STRINGIFY_BIGINT (bufmap_head->sizetotal, totsizebuf),
+ STRINGIFY_BIGINT (continued_file_size, s1buf),
+ STRINGIFY_BIGINT (continued_file_offset, s2buf)));
+ return false;
+ }
+
+ if (bufmap_head->sizetotal - bufmap_head->sizeleft !=
+ continued_file_offset)
+ {
+ char totsizebuf[UINTMAX_STRSIZE_BOUND];
+ char s1buf[UINTMAX_STRSIZE_BOUND];
+ char s2buf[UINTMAX_STRSIZE_BOUND];
+
+ WARN ((0, 0, _("This volume is out of sequence (%s - %s != %s)"),
+ STRINGIFY_BIGINT (bufmap_head->sizetotal, totsizebuf),
+ STRINGIFY_BIGINT (bufmap_head->sizeleft, s1buf),
+ STRINGIFY_BIGINT (continued_file_offset, s2buf)));
+
+ return false;
+ }