Avoid aligned access for references by decoding into temporary buffer and then copying the result into the actual buffer. Update test to be more thorough with using compound datatype fields everywhere. (#206)

2 files changed, 14 insertions, 7 deletions

diff --git a/src/H5Rint.c b/src/H5Rint.c
index 40f48a1..00ea82f 100644
--- a/src/H5Rint.c
+++ b/src/H5Rint.c
@@ -1041,12 +1041,13 @@ H5R__decode(const unsigned char *buf, size_t *nbytes, H5R_ref_priv_t *ref)
 
     FUNC_ENTER_PACKAGE
 
+    /* Sanity checks */
     HDassert(buf);
     HDassert(nbytes);
     HDassert(ref);
-    buf_size = *nbytes;
 
     /* Don't decode if buffer size isn't big enough */
+    buf_size = *nbytes;
     if (buf_size < H5R_ENCODE_HEADER_SIZE)
         HGOTO_ERROR(H5E_REFERENCE, H5E_CANTDECODE, FAIL, "Buffer size is too small")
 
@@ -1107,6 +1108,7 @@ H5R__decode(const unsigned char *buf, size_t *nbytes, H5R_ref_priv_t *ref)
     H5R_LOG_DEBUG("Decoded reference, filename=%s, obj_addr=%s, encode size=%u", ref->info.obj.filename,
                   H5R__print_token(ref->info.obj.token), ref->encode_size);
 
+    /* Set output info */
     *nbytes = decode_size;
 
 done:
diff --git a/src/H5Tref.c b/src/H5Tref.c
index c71724f..0c17d49 100644
--- a/src/H5Tref.c
+++ b/src/H5Tref.c
@@ -589,6 +589,7 @@ H5T__ref_mem_write(H5VL_object_t *src_file, const void *src_buf, size_t src_size
     H5F_t *         src_f     = NULL;
     hid_t           file_id   = H5I_INVALID_HID;
     H5R_ref_priv_t *dst_ref   = (H5R_ref_priv_t *)dst_buf;
+    H5R_ref_priv_t  tmp_ref;             /* Temporary reference to decode into */
     herr_t          ret_value = SUCCEED;
 
     FUNC_ENTER_STATIC
@@ -599,6 +600,7 @@ H5T__ref_mem_write(H5VL_object_t *src_file, const void *src_buf, size_t src_size
     HDassert(src_size);
     HDassert(dst_buf);
     HDassert(dst_size == H5T_REF_MEM_SIZE);
+    HDcompile_assert(sizeof(*dst_ref) == sizeof(tmp_ref));
 
     /* Memory-to-memory conversion to support vlen conversion */
     if (NULL == src_file) {
@@ -624,13 +626,13 @@ H5T__ref_mem_write(H5VL_object_t *src_file, const void *src_buf, size_t src_size
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid VOL object")
 
     /* Make sure reference buffer is correctly initialized */
-    HDmemset(dst_buf, 0, dst_size);
+    HDmemset(&tmp_ref, 0, sizeof(tmp_ref));
 
     switch (src_type) {
         case H5R_OBJECT1: {
             size_t token_size = H5F_SIZEOF_ADDR(src_f);
 
-            if (H5R__create_object((const H5O_token_t *)src_buf, token_size, dst_ref) < 0)
+            if (H5R__create_object((const H5O_token_t *)src_buf, token_size, &tmp_ref) < 0)
                 HGOTO_ERROR(H5E_REFERENCE, H5E_CANTCREATE, FAIL, "unable to create object reference")
         } break;
 
@@ -638,7 +640,7 @@ H5T__ref_mem_write(H5VL_object_t *src_file, const void *src_buf, size_t src_size
             const struct H5Tref_dsetreg *src_reg    = (const struct H5Tref_dsetreg *)src_buf;
             size_t                       token_size = H5F_SIZEOF_ADDR(src_f);
 
-            if (H5R__create_region(&src_reg->token, token_size, src_reg->space, dst_ref) < 0)
+            if (H5R__create_region(&src_reg->token, token_size, src_reg->space, &tmp_ref) < 0)
                 HGOTO_ERROR(H5E_REFERENCE, H5E_CANTCREATE, FAIL, "unable to create region reference")
 
             /* create_region creates its internal copy of the space */
@@ -655,7 +657,7 @@ H5T__ref_mem_write(H5VL_object_t *src_file, const void *src_buf, size_t src_size
         case H5R_OBJECT2:
         case H5R_ATTR:
             /* Decode reference */
-            if (H5R__decode((const unsigned char *)src_buf, &src_size, dst_ref) < 0)
+            if (H5R__decode((const unsigned char *)src_buf, &src_size, &tmp_ref) < 0)
                 HGOTO_ERROR(H5E_REFERENCE, H5E_CANTDECODE, FAIL, "Cannot decode reference")
             break;
 
@@ -667,17 +669,20 @@ H5T__ref_mem_write(H5VL_object_t *src_file, const void *src_buf, size_t src_size
     } /* end switch */
 
     /* If no filename set, this is not an external reference */
-    if (NULL == H5R_REF_FILENAME(dst_ref)) {
+    if (NULL == H5R_REF_FILENAME(&tmp_ref)) {
         /* TODO temporary hack to retrieve file object */
         if ((file_id = H5F_get_file_id(src_file, H5I_FILE, FALSE)) < 0)
             HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
 
         /* Attach loc ID to reference and hold reference to it, this is a
          * user exposed reference so set app_ref to TRUE. */
-        if (H5R__set_loc_id(dst_ref, file_id, TRUE, TRUE) < 0)
+        if (H5R__set_loc_id(&tmp_ref, file_id, TRUE, TRUE) < 0)
             HGOTO_ERROR(H5E_REFERENCE, H5E_CANTSET, FAIL, "unable to attach location id to reference")
     } /* end if */
 
+    /* Set output info */
+    HDmemcpy(dst_ref, &tmp_ref, sizeof(tmp_ref));
+
 done:
     if ((file_id != H5I_INVALID_HID) && (H5I_dec_ref(file_id) < 0))
         HDONE_ERROR(H5E_REFERENCE, H5E_CANTDEC, FAIL, "unable to decrement refcount on location id")