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diff --git a/gpr/source/lib/vc5_common/utilities.c b/gpr/source/lib/vc5_common/utilities.c
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+++ b/gpr/source/lib/vc5_common/utilities.c
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+/*! @file utilities.c
+ *
+ *  @brief The utilities in this file are included to allow the codec to be tested.
+ *
+ *  @version 1.0.0
+ *
+ *  (C) Copyright 2018 GoPro Inc (http://gopro.com/).
+ *
+ *  Licensed under either:
+ *  - Apache License, Version 2.0, http://www.apache.org/licenses/LICENSE-2.0
+ *  - MIT license, http://opensource.org/licenses/MIT
+ *  at your option.
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#include "common.h"
+
+/*!
+	@brief Check that the enabled parts are correct
+*/
+CODEC_ERROR CheckEnabledParts(ENABLED_PARTS *enabled_parts_ref)
+{
+	ENABLED_PARTS enabled_parts = (*enabled_parts_ref);
+
+	// The elementary bitstream is always enabled
+	if ((enabled_parts & VC5_PART_MASK(VC5_PART_ELEMENTARY)) == 0) {
+		enabled_parts |= VC5_PART_MASK(VC5_PART_ELEMENTARY);
+	}
+
+	// The conformance specification is never enabled
+	enabled_parts &= ~((uint32_t)VC5_PART_MASK(VC5_PART_CONFORMANCE));
+
+	// Image formats must be enabled if subsampled color differences are enabled
+	if ((enabled_parts & VC5_PART_MASK(VC5_PART_COLOR_SAMPLING)) != 0) {
+		enabled_parts |= VC5_PART_MASK(VC5_PART_IMAGE_FORMATS);
+	}
+
+	// Check that the enabled parts were built at compile-time
+	//assert((enabled_parts & VC5_ENABLED_PARTS) == enabled_parts);
+	if (! ((enabled_parts & VC5_ENABLED_PARTS) == enabled_parts)) {
+		return CODEC_ERROR_ENABLED_PARTS;
+	}
+
+	// Return the correct enabled parts mask
+	*enabled_parts_ref = enabled_parts;
+	return CODEC_ERROR_OKAY;
+}
+
+/*!
+	@brief Verify that the enabled parts are correct
+*/
+CODEC_ERROR VerifyEnabledParts(ENABLED_PARTS enabled_parts)
+{
+	// The elementary bitstream must always be enabled
+	if ((enabled_parts & VC5_PART_MASK(VC5_PART_ELEMENTARY)) == 0) {
+		return CODEC_ERROR_ENABLED_PARTS;
+	}
+
+	// The conformance specification must not be enabled
+	if ((enabled_parts & VC5_PART_MASK(VC5_PART_CONFORMANCE)) != 0) {
+		return CODEC_ERROR_ENABLED_PARTS;
+	}
+
+	// Image formats must be enabled if subsampled color differences are enabled
+	if ((enabled_parts & VC5_PART_MASK(VC5_PART_COLOR_SAMPLING)) != 0 &&
+		(enabled_parts & VC5_PART_MASK(VC5_PART_IMAGE_FORMATS)) == 0) {
+		return CODEC_ERROR_ENABLED_PARTS;
+	}
+
+	// All enabled parts must be compiled into this codec implementation
+	if ((enabled_parts & VC5_ENABLED_PARTS) != enabled_parts) {
+		return CODEC_ERROR_ENABLED_PARTS;
+	}
+
+	// This codec implementation supports the enabled parts of the VC-5 standard
+	return CODEC_ERROR_OKAY;
+}