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https://git.mirrors.martin98.com/https://github.com/google/draco
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114 lines
3.4 KiB
C++
114 lines
3.4 KiB
C++
// Copyright 2016 The Draco Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include "core/bit_coder.h"
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#include "core/draco_test_base.h"
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namespace draco {
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class BitDecoderTest : public ::testing::Test {};
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class BitEncoderTest : public ::testing::Test {};
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TEST_F(BitDecoderTest, TestBitCodersByteAligned) {
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constexpr int buffer_size = 32;
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char buffer[buffer_size];
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BitEncoder encoder(buffer);
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const uint8_t data[] = {0x76, 0x54, 0x32, 0x10, 0x76, 0x54, 0x32, 0x10};
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const int bytes_to_encode = sizeof(data);
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for (int i = 0; i < bytes_to_encode; ++i) {
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encoder.PutBits(data[i], sizeof(data[i]) * 8);
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ASSERT_EQ((i + 1) * sizeof(data[i]) * 8, encoder.Bits());
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}
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BitDecoder decoder;
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decoder.reset(static_cast<const void *>(buffer), bytes_to_encode);
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for (int i = 0; i < bytes_to_encode; ++i) {
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uint32_t x = 0;
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ASSERT_TRUE(decoder.GetBits(8, &x));
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ASSERT_EQ(x, data[i]);
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}
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ASSERT_EQ(bytes_to_encode * 8u, decoder.BitsDecoded());
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}
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TEST_F(BitDecoderTest, TestBitCodersNonByte) {
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constexpr int buffer_size = 32;
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char buffer[buffer_size];
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BitEncoder encoder(buffer);
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const uint8_t data[] = {0x76, 0x54, 0x32, 0x10, 0x76, 0x54, 0x32, 0x10};
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const uint32_t bits_to_encode = 51;
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const int bytes_to_encode = (bits_to_encode / 8) + 1;
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for (int i = 0; i < bytes_to_encode; ++i) {
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const int num_bits = (encoder.Bits() + 8 <= bits_to_encode)
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? 8
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: bits_to_encode - encoder.Bits();
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encoder.PutBits(data[i], num_bits);
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}
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BitDecoder decoder;
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decoder.reset(static_cast<const void *>(buffer), bytes_to_encode);
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int64_t bits_to_decode = encoder.Bits();
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for (int i = 0; i < bytes_to_encode; ++i) {
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uint32_t x = 0;
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const int num_bits = (bits_to_decode > 8) ? 8 : bits_to_decode;
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ASSERT_TRUE(decoder.GetBits(num_bits, &x));
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const int bits_to_shift = 8 - num_bits;
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const uint8_t test_byte =
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((data[i] << bits_to_shift) & 0xff) >> bits_to_shift;
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ASSERT_EQ(x, test_byte);
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bits_to_decode -= 8;
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}
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ASSERT_EQ(bits_to_encode, decoder.BitsDecoded());
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}
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TEST_F(BitDecoderTest, TestSingleBits) {
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const int data = 0xaaaa;
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BitDecoder decoder;
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decoder.reset(static_cast<const void *>(&data), sizeof(data));
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for (uint32_t i = 0; i < 16; ++i) {
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uint32_t x = 0;
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ASSERT_TRUE(decoder.GetBits(1, &x));
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ASSERT_EQ(x, (i % 2));
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}
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ASSERT_EQ(16u, decoder.BitsDecoded());
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}
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TEST_F(BitDecoderTest, TestMultipleBits) {
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const uint8_t data[] = {0x76, 0x54, 0x32, 0x10, 0x76, 0x54, 0x32, 0x10};
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BitDecoder decoder;
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decoder.reset(static_cast<const void *>(data), sizeof(data));
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uint32_t x = 0;
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for (uint32_t i = 0; i < 2; ++i) {
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ASSERT_TRUE(decoder.GetBits(16, &x));
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ASSERT_EQ(x, 0x5476u);
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ASSERT_EQ(16 + (i * 32), decoder.BitsDecoded());
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ASSERT_TRUE(decoder.GetBits(16, &x));
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ASSERT_EQ(x, 0x1032u);
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ASSERT_EQ(32 + (i * 32), decoder.BitsDecoded());
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}
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}
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} // namespace draco
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