+ PUT16(&tag->data[0],GET16(&tag->data[0])+add);
+}
+
+void jpeg_assert()
+{
+ /* TODO: if there's a jpegtable found, store it
+ and handle it together with the flash file
+ headers */
+ /* check that master and slave don't have both
+ jpegtables (which would be fatal) */
+ int pos;
+ int mpos=-1, spos=-1;
+ pos = 0;
+ while(master.tags[pos].id != 0)
+ {
+ if(master.tags[pos].id == TAGID_JPEGTABLES)
+ mpos = pos;
+ pos++;
+ }
+ pos = 0;
+ while(slave.tags[pos].id != 0)
+ {
+ if(slave.tags[pos].id == TAGID_JPEGTABLES)
+ spos = pos;
+ pos++;
+ }
+ if(spos>=0 && mpos>=0)
+ {
+ if(slave.tags[pos].length ==
+ master.tags[pos].length &&
+ !memcmp(slave.tags[pos].data, master.tags[pos].data,
+ master.tags[pos].length))
+ {
+ // ok, both have jpegtables, but they're identical.
+ // delete one and don't make an error
+ for(;spos<slave.tagnum-1;spos++)
+ slave.tags[spos] =
+ slave.tags[spos+1];
+ spos = -1;
+ }
+ }
+ if(spos>=0 && mpos>=0) {
+ logf("<error> Master and slave have incompatible JPEGTABLES.");
+ }