Improve linearized pdf load/show time.

pdf/chunk_stream_unittest.cc

Index: pdf/chunk_stream_unittest.cc
diff --git a/pdf/chunk_stream_unittest.cc b/pdf/chunk_stream_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d4018ae73f29fd8dff9e169b1668615825e2632e
--- /dev/null
+++ b/pdf/chunk_stream_unittest.cc
@@ -0,0 +1,98 @@
+// Copyright (c) 2016 The Chromium 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 "pdf/chunk_stream.h"
+
+#include <array>
+#include <memory>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace chrome_pdf {
+namespace {
+typedef ChunkStream<10> TestChunkStream;
+std::unique_ptr<TestChunkStream::ChunkData> CreateChunkData() {
+  return std::unique_ptr<TestChunkStream::ChunkData>(
+      new TestChunkStream::ChunkData());
+}
+}
+
+TEST(ChunkStreamTest, InRow) {
+  TestChunkStream stream;
+  EXPECT_FALSE(stream.IsComplete());
+  EXPECT_FALSE(stream.IsRangeAvailable(gfx::Range(0, 10)));
+  stream.SetChunkData(0, CreateChunkData());
+  EXPECT_TRUE(stream.IsRangeAvailable(gfx::Range(0, 10)));
+  EXPECT_FALSE(stream.IsRangeAvailable(gfx::Range(0, 20)));
+  stream.SetChunkData(1, CreateChunkData());
+  EXPECT_TRUE(stream.IsRangeAvailable(gfx::Range(0, 20)));
+  EXPECT_FALSE(stream.IsRangeAvailable(gfx::Range(0, 30)));
+  stream.SetChunkData(2, CreateChunkData());
+  EXPECT_TRUE(stream.IsRangeAvailable(gfx::Range(0, 30)));
+  stream.set_eof_pos(25);
+  EXPECT_FALSE(stream.IsRangeAvailable(gfx::Range(0, 30)));
+  EXPECT_TRUE(stream.IsRangeAvailable(gfx::Range(0, 25)));
+  EXPECT_TRUE(stream.IsComplete());
+}
+
+TEST(ChunkStreamTest, InBackRow) {
+  TestChunkStream stream;
+  stream.set_eof_pos(25);
+  EXPECT_FALSE(stream.IsComplete());
+  EXPECT_FALSE(stream.IsRangeAvailable(gfx::Range(20, 25)));
+  stream.SetChunkData(2, CreateChunkData());
+  EXPECT_TRUE(stream.IsRangeAvailable(gfx::Range(20, 25)));
+  EXPECT_FALSE(stream.IsRangeAvailable(gfx::Range(10, 20)));
+  stream.SetChunkData(1, CreateChunkData());
+  EXPECT_TRUE(stream.IsRangeAvailable(gfx::Range(10, 20)));
+  EXPECT_FALSE(stream.IsRangeAvailable(gfx::Range(0, 10)));
+  stream.SetChunkData(0, CreateChunkData());
+  EXPECT_TRUE(stream.IsRangeAvailable(gfx::Range(0, 10)));
+  EXPECT_TRUE(stream.IsComplete());
+}
+
+TEST(ChunkStreamTest, FillGap) {
+  TestChunkStream stream;
+  stream.set_eof_pos(25);
+  EXPECT_FALSE(stream.IsComplete());
+  stream.SetChunkData(0, CreateChunkData());
+  stream.SetChunkData(2, CreateChunkData());
+  EXPECT_TRUE(stream.IsRangeAvailable(gfx::Range(0, 10)));
+  EXPECT_TRUE(stream.IsRangeAvailable(gfx::Range(20, 25)));
+  EXPECT_FALSE(stream.IsRangeAvailable(gfx::Range(0, 25)));
+  stream.SetChunkData(1, CreateChunkData());
+  EXPECT_TRUE(stream.IsRangeAvailable(gfx::Range(0, 25)));
+  EXPECT_TRUE(stream.IsComplete());
+}
+
+TEST(ChunkStreamTest, Read) {
+  TestChunkStream stream;
+  stream.set_eof_pos(25);
+  const unsigned char start_value = 33;
+  unsigned char value = start_value;
+  auto chunk_0 = CreateChunkData();
+  for (auto& it : *chunk_0) {
+    it = ++value;
+  }
+  auto chunk_1 = CreateChunkData();
+  for (auto& it : *chunk_1) {
+    it = ++value;
+  }
+  auto chunk_2 = CreateChunkData();
+  for (auto& it : *chunk_2) {
+    it = ++value;
+  }
+  stream.SetChunkData(0, std::move(chunk_0));
+  stream.SetChunkData(2, std::move(chunk_2));
+  stream.SetChunkData(1, std::move(chunk_1));
+
+  std::array<unsigned char, 25> result_data;
+  EXPECT_TRUE(stream.ReadData(gfx::Range(0, 25), result_data.data()));
+
+  value = start_value;
+  for (const auto& it : result_data) {
+    EXPECT_EQ(it, ++value);
+  }
+}
+}  // namespace chrome_pdf