Differential D4501 Diff 14126 extern/gltf-draco/draco/src/draco/core/buffer_bit_coding_test.cc

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extern/gltf-draco/draco/src/draco/core/buffer_bit_coding_test.cc

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				// Copyright 2016 The Draco Authors.
				//
				// Licensed under the Apache License, Version 2.0 (the "License");
				// you may not use this file except in compliance with the License.
				// You may obtain a copy of the License at
				//
				// http://www.apache.org/licenses/LICENSE-2.0
				//
				// 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 "draco/core/decoder_buffer.h"
				#include "draco/core/encoder_buffer.h"

				#include "draco/core/draco_test_base.h"

				namespace draco {

				class BufferBitCodingTest : public ::testing::Test {
				public:
				typedef DecoderBuffer::BitDecoder BitDecoder;
				typedef EncoderBuffer::BitEncoder BitEncoder;
				};

				TEST_F(BufferBitCodingTest, TestBitCodersByteAligned) {
				constexpr int buffer_size = 32;
				char buffer[buffer_size];
				BitEncoder encoder(buffer);
				const uint8_t data[] = {0x76, 0x54, 0x32, 0x10, 0x76, 0x54, 0x32, 0x10};
				const int bytes_to_encode = sizeof(data);

				for (int i = 0; i < bytes_to_encode; ++i) {
				encoder.PutBits(data[i], sizeof(data[i]) * 8);
				ASSERT_EQ((i + 1) * sizeof(data[i]) * 8, encoder.Bits());
				}

				BitDecoder decoder;
				decoder.reset(static_cast<const void *>(buffer), bytes_to_encode);
				for (int i = 0; i < bytes_to_encode; ++i) {
				uint32_t x = 0;
				ASSERT_TRUE(decoder.GetBits(8, &x));
				ASSERT_EQ(x, data[i]);
				}

				ASSERT_EQ(bytes_to_encode * 8u, decoder.BitsDecoded());
				}

				TEST_F(BufferBitCodingTest, TestBitCodersNonByte) {
				constexpr int buffer_size = 32;
				char buffer[buffer_size];
				BitEncoder encoder(buffer);
				const uint8_t data[] = {0x76, 0x54, 0x32, 0x10, 0x76, 0x54, 0x32, 0x10};
				const uint32_t bits_to_encode = 51;
				const int bytes_to_encode = (bits_to_encode / 8) + 1;

				for (int i = 0; i < bytes_to_encode; ++i) {
				const int num_bits = (encoder.Bits() + 8 <= bits_to_encode)
				? 8
				: bits_to_encode - encoder.Bits();
				encoder.PutBits(data[i], num_bits);
				}

				BitDecoder decoder;
				decoder.reset(static_cast<const void *>(buffer), bytes_to_encode);
				int64_t bits_to_decode = encoder.Bits();
				for (int i = 0; i < bytes_to_encode; ++i) {
				uint32_t x = 0;
				const int num_bits = (bits_to_decode > 8) ? 8 : bits_to_decode;
				ASSERT_TRUE(decoder.GetBits(num_bits, &x));
				const int bits_to_shift = 8 - num_bits;
				const uint8_t test_byte =
				((data[i] << bits_to_shift) & 0xff) >> bits_to_shift;
				ASSERT_EQ(x, test_byte);
				bits_to_decode -= 8;
				}

				ASSERT_EQ(bits_to_encode, decoder.BitsDecoded());
				}

				TEST_F(BufferBitCodingTest, TestSingleBits) {
				const int data = 0xaaaa;

				BitDecoder decoder;
				decoder.reset(static_cast<const void *>(&data), sizeof(data));

				for (uint32_t i = 0; i < 16; ++i) {
				uint32_t x = 0;
				ASSERT_TRUE(decoder.GetBits(1, &x));
				ASSERT_EQ(x, (i % 2));
				}

				ASSERT_EQ(16u, decoder.BitsDecoded());
				}

				TEST_F(BufferBitCodingTest, TestMultipleBits) {
				const uint8_t data[] = {0x76, 0x54, 0x32, 0x10, 0x76, 0x54, 0x32, 0x10};

				BitDecoder decoder;
				decoder.reset(static_cast<const void *>(data), sizeof(data));

				uint32_t x = 0;
				for (uint32_t i = 0; i < 2; ++i) {
				ASSERT_TRUE(decoder.GetBits(16, &x));
				ASSERT_EQ(x, 0x5476u);
				ASSERT_EQ(16 + (i * 32), decoder.BitsDecoded());

				ASSERT_TRUE(decoder.GetBits(16, &x));
				ASSERT_EQ(x, 0x1032u);
				ASSERT_EQ(32 + (i * 32), decoder.BitsDecoded());
				}
				}

				} // namespace draco