- Always return metadata struct, but set asoc to null iff j2k.

src/lib/openjp2/j2k.c

@@ -10510,8 +10510,13 @@ opj_codestream_info_v2_t* j2k_get_cstr_info(opj_j2k_t* p_j2k)
 
 opj_jp2_metadata_t* j2k_get_metadata( opj_j2k_t* p_j2k )
 {
-  /* A J2K stream can not contain jp2 meta data */
-  return NULL;
+    opj_jp2_metadata_t* p_metadata = opj_malloc(sizeof(opj_jp2_metadata_t));
+
+    /* A J2K stream can not contain ASOC boxes */
+    p_metadata->nbasoc = 0;
+    p_metadata->asoc_info = 00;
+
+    return p_metadata;
 }
 
 opj_codestream_index_t* j2k_get_cstr_index(opj_j2k_t* p_j2k)

src/lib/openjp2/j2k.h

@@ -799,7 +799,7 @@ opj_codestream_info_v2_t* j2k_get_cstr_info(opj_j2k_t* p_j2k);
  *
  *@param    p_j2k               the component image header to dump.
  *
- *@return   NULL for j2k streams. The metadata extract from the jpg2000 codec
+ *@return   The metadata extract from the jpg2000 codec
  */
  opj_jp2_metadata_t* j2k_get_metadata( opj_j2k_t* p_j2k );
 

src/lib/openjp2/jp2.c

@@ -3387,7 +3387,7 @@ opj_codestream_info_v2_t* jp2_get_cstr_info(opj_jp2_t* p_jp2)
     return p_info;
 }
 
-OPJ_BOOL jp2_copy_asoc_data(opj_jp2_t* p_jp2, opj_codestream_info_v2_t* p_info)
+opj_jp2_metadata_t* jp2_get_metadata( opj_jp2_t* p_jp2 )
 {
     opj_jp2_metadata_t* p_metadata = opj_malloc(sizeof(opj_jp2_metadata_t));
     jp2_copy_asoc_data(p_jp2, p_metadata);