+ if (cinfo->process == JPROC_LOSSLESS) {
+#ifdef C_LOSSLESS_SUPPORTED
+ /* The JPEG spec simply gives the range 0..15 for Al (Pt), but that
+ * seems wrong: the upper bound ought to depend on data precision.
+ * Perhaps they really meant 0..N-1 for N-bit precision, which is what
+ * we allow here.
+ */
+ if (Ss < 1 || Ss > 7 || /* predictor selector */
+ Se != 0 || Ah != 0 ||
+ Al < 0 || Al >= cinfo->data_precision) /* point transform */
+ ERREXIT1(cinfo, JERR_BAD_LOSSLESS_SCRIPT, scanno);
+ /* Make sure components are not sent twice */
+ for (ci = 0; ci < ncomps; ci++) {
+ thisi = scanptr->component_index[ci];
+ if (component_sent[thisi])
+ ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
+ component_sent[thisi] = TRUE;
+ }
+#endif
+ } else if (cinfo->process == JPROC_PROGRESSIVE) {