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-rw-r--r--core/fxcrt/cfx_bitstream_unittest.cpp119
1 files changed, 119 insertions, 0 deletions
diff --git a/core/fxcrt/cfx_bitstream_unittest.cpp b/core/fxcrt/cfx_bitstream_unittest.cpp
new file mode 100644
index 0000000000..991cd43147
--- /dev/null
+++ b/core/fxcrt/cfx_bitstream_unittest.cpp
@@ -0,0 +1,119 @@
+// Copyright 2018 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/fxcrt/cfx_bitstream.h"
+#include "core/fxcrt/fx_extension.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(fxcrt, BitStream) {
+ static const uint8_t kData[] = {0x00, 0x11, 0x22, 0x33,
+ 0x44, 0x55, 0x66, 0x77};
+ CFX_BitStream bitstream(kData);
+
+ // Initial state.
+ EXPECT_FALSE(bitstream.IsEOF());
+ EXPECT_EQ(0U, bitstream.GetPos());
+ EXPECT_EQ(64U, bitstream.BitsRemaining());
+
+ // Read, read, read!
+ EXPECT_EQ(0x00U, bitstream.GetBits(8));
+ EXPECT_EQ(8U, bitstream.GetPos());
+ EXPECT_EQ(56U, bitstream.BitsRemaining());
+
+ EXPECT_EQ(0x00U, bitstream.GetBits(1));
+ EXPECT_EQ(9U, bitstream.GetPos());
+ EXPECT_EQ(55U, bitstream.BitsRemaining());
+
+ EXPECT_EQ(0x00U, bitstream.GetBits(2));
+ EXPECT_EQ(11U, bitstream.GetPos());
+ EXPECT_EQ(53U, bitstream.BitsRemaining());
+
+ EXPECT_EQ(0x04U, bitstream.GetBits(3));
+ EXPECT_EQ(14U, bitstream.GetPos());
+ EXPECT_EQ(50U, bitstream.BitsRemaining());
+
+ EXPECT_EQ(0x04U, bitstream.GetBits(4));
+ EXPECT_EQ(18U, bitstream.GetPos());
+ EXPECT_EQ(46U, bitstream.BitsRemaining());
+
+ EXPECT_EQ(0x44U, bitstream.GetBits(7));
+ EXPECT_EQ(25U, bitstream.GetPos());
+ EXPECT_EQ(39U, bitstream.BitsRemaining());
+
+ EXPECT_EQ(0xCDU, bitstream.GetBits(9));
+ EXPECT_EQ(34U, bitstream.GetPos());
+ EXPECT_EQ(30U, bitstream.BitsRemaining());
+
+ EXPECT_EQ(0x08AAU, bitstream.GetBits(15));
+ EXPECT_EQ(49U, bitstream.GetPos());
+ EXPECT_EQ(15U, bitstream.BitsRemaining());
+
+ // Cannot advance past the end.
+ EXPECT_EQ(0x00U, bitstream.GetBits(16));
+ EXPECT_EQ(49U, bitstream.GetPos());
+ EXPECT_EQ(15U, bitstream.BitsRemaining());
+
+ // Make sure SkipBits() works.
+ bitstream.SkipBits(14);
+ EXPECT_EQ(63U, bitstream.GetPos());
+ EXPECT_EQ(1U, bitstream.BitsRemaining());
+ bitstream.SkipBits(2);
+ EXPECT_EQ(65U, bitstream.GetPos());
+ EXPECT_EQ(0U, bitstream.BitsRemaining());
+ EXPECT_TRUE(bitstream.IsEOF());
+
+ // Make sure Rewind() works.
+ bitstream.Rewind();
+ EXPECT_FALSE(bitstream.IsEOF());
+ EXPECT_EQ(0U, bitstream.GetPos());
+ EXPECT_EQ(64U, bitstream.BitsRemaining());
+
+ // Read some more.
+ bitstream.SkipBits(5);
+ EXPECT_EQ(5U, bitstream.GetPos());
+ EXPECT_EQ(59U, bitstream.BitsRemaining());
+
+ EXPECT_EQ(0x0448U, bitstream.GetBits(17));
+ EXPECT_EQ(22U, bitstream.GetPos());
+ EXPECT_EQ(42U, bitstream.BitsRemaining());
+
+ // Make sure ByteAlign() works.
+ bitstream.ByteAlign();
+ EXPECT_EQ(24U, bitstream.GetPos());
+ EXPECT_EQ(40U, bitstream.BitsRemaining());
+
+ EXPECT_EQ(0x19A22AB3U, bitstream.GetBits(31));
+ EXPECT_EQ(55U, bitstream.GetPos());
+ EXPECT_EQ(9U, bitstream.BitsRemaining());
+
+ // Do some bigger reads.
+ bitstream.Rewind();
+ EXPECT_EQ(0x112233U, bitstream.GetBits(32));
+ EXPECT_EQ(32U, bitstream.GetPos());
+ EXPECT_EQ(32U, bitstream.BitsRemaining());
+
+ bitstream.Rewind();
+ bitstream.SkipBits(31);
+ EXPECT_EQ(0xA22AB33BU, bitstream.GetBits(32));
+ EXPECT_EQ(63U, bitstream.GetPos());
+ EXPECT_EQ(1U, bitstream.BitsRemaining());
+
+ // Skip past the end.
+ bitstream.SkipBits(1000);
+ EXPECT_TRUE(bitstream.IsEOF());
+ EXPECT_EQ(1063U, bitstream.GetPos());
+ EXPECT_EQ(0U, bitstream.BitsRemaining());
+}
+
+TEST(fxcrt, BitStreamSameAsGetBit32) {
+ unsigned char kData[] = {0xDE, 0x3F, 0xB1, 0x7C, 0x12, 0x9A, 0x04, 0x56};
+ CFX_BitStream bitstream(kData);
+ for (uint32_t nbits = 1; nbits <= 32; ++nbits) {
+ for (size_t bitpos = 0; bitpos < sizeof(kData) * 8 - nbits; ++bitpos) {
+ bitstream.Rewind();
+ bitstream.SkipBits(bitpos);
+ EXPECT_EQ(bitstream.GetBits(nbits), GetBits32(kData, bitpos, nbits));
+ }
+ }
+}