openjp2/j2k: Report error if all wanted components are not decoded.

Previously the caller had to check whether each component data had
been decoded. This means duplicating the checking in every user of
openjpeg which is unnecessary. If the caller wantes to decode all
or a set of, or a specific component then openjpeg ought to error
out if it was unable to do so.

Fixes #1158.

src/bin/jp2/opj_decompress.c

@@ -1571,17 +1571,6 @@ int main(int argc, char **argv)
             }
         }
 
-        /* FIXME? Shouldn't that situation be considered as an error of */
-        /* opj_decode() / opj_get_decoded_tile() ? */
-        if (image->comps[0].data == NULL) {
-            fprintf(stderr, "ERROR -> opj_decompress: no image data!\n");
-            opj_destroy_codec(l_codec);
-            opj_stream_destroy(l_stream);
-            opj_image_destroy(image);
-            failed = 1;
-            goto fin;
-        }
-
         tCumulative += opj_clock() - t;
         numDecompressedImages++;
 

src/lib/openjp2/j2k.c

@@ -10657,6 +10657,42 @@ static OPJ_BOOL opj_j2k_allocate_tile_element_cstr_index(opj_j2k_t *p_j2k)
     return OPJ_TRUE;
 }
 
+static OPJ_BOOL opj_j2k_are_all_used_components_decoded(opj_j2k_t *p_j2k,
+        opj_event_mgr_t * p_manager)
+{
+    OPJ_UINT32 compno;
+    OPJ_BOOL decoded_all_used_components = OPJ_TRUE;
+
+    if (p_j2k->m_specific_param.m_decoder.m_numcomps_to_decode) {
+        for (compno = 0;
+                compno < p_j2k->m_specific_param.m_decoder.m_numcomps_to_decode; compno++) {
+            OPJ_UINT32 dec_compno =
+                p_j2k->m_specific_param.m_decoder.m_comps_indices_to_decode[compno];
+            if (p_j2k->m_output_image->comps[dec_compno].data == NULL) {
+                opj_event_msg(p_manager, EVT_WARNING, "Failed to decode component %d\n",
+                              dec_compno);
+                decoded_all_used_components = OPJ_FALSE;
+            }
+        }
+    } else {
+        for (compno = 0; compno < p_j2k->m_output_image->numcomps; compno++) {
+            if (p_j2k->m_output_image->comps[compno].data == NULL) {
+                opj_event_msg(p_manager, EVT_WARNING, "Failed to decode component %d\n",
+                              compno);
+                decoded_all_used_components = OPJ_FALSE;
+            }
+        }
+    }
+
+    if (decoded_all_used_components == OPJ_FALSE) {
+        opj_event_msg(p_manager, EVT_ERROR, "Failed to decode all used components\n");
+        return OPJ_FALSE;
+    }
+
+    return OPJ_TRUE;
+}
+
+
 static OPJ_BOOL opj_j2k_decode_tiles(opj_j2k_t *p_j2k,
                                      opj_stream_private_t *p_stream,
                                      opj_event_mgr_t * p_manager)
@@ -10768,6 +10804,10 @@ static OPJ_BOOL opj_j2k_decode_tiles(opj_j2k_t *p_j2k,
         }
     }
 
+    if (! opj_j2k_are_all_used_components_decoded(p_j2k, p_manager)) {
+        return OPJ_FALSE;
+    }
+
     return OPJ_TRUE;
 }
 
@@ -10896,6 +10936,10 @@ static OPJ_BOOL opj_j2k_decode_one_tile(opj_j2k_t *p_j2k,
 
     }
 
+    if (! opj_j2k_are_all_used_components_decoded(p_j2k, p_manager)) {
+        return OPJ_FALSE;
+    }
+
     return OPJ_TRUE;
 }