1 files changed, 116 insertions, 0 deletions
diff --git a/extern/draco/dracoenc/src/draco/core/buffer_bit_coding_test.cc b/extern/draco/dracoenc/src/draco/core/buffer_bit_coding_test.cc
new file mode 100644
index 00000000000..e761284e236
--- /dev/null
+++ b/extern/draco/dracoenc/src/draco/core/buffer_bit_coding_test.cc
@@ -0,0 +1,116 @@
+// 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