Added CompoundBuffer that will be used to store data in the encoding/decoding

remoting/base/compound_buffer_unittest.cc

+// Copyright (c) 2010 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 <string>
+
+#include "base/callback.h"
+#include "base/scoped_ptr.h"
+#include "net/base/io_buffer.h"
+#include "remoting/base/compound_buffer.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using net::IOBuffer;
+
+namespace remoting {
+
+namespace {
+const int kDataSize = 1024;
+
+// Chunk sizes used to append and prepend data to the buffer.
+const int kChunkSizes0[] = {kDataSize, -1};
+const int kChunkSizes1[] = {1, 10, 20, -1};
+
+// Chunk sizes used to test CopyFrom().
+const int kCopySizes0[] = {10, 3, -1};
+const int kCopySizes1[] = {20, -1};
+}  // namespace
+
+class CompoundBufferTest : public testing::Test {
+ public:
+
+  // Following 5 methods are used with IterateOverPieces().
+  void Append(int pos, int size) {
+    target_.Append(data_, data_->data() + pos, size);
+  }
+
+  void AppendCopyOf(int pos, int size) {
+    target_.AppendCopyOf(data_->data() + pos, size);
+  }
+
+  void Prepend(int pos, int size) {
+    target_.Prepend(data_, data_->data() + kDataSize - pos - size, size);
+  }
+
+  void PrependCopyOf(int pos, int size) {
+    target_.PrependCopyOf(data_->data() + (kDataSize - pos - size), size);
+  }
+
+  void TestCopyFrom(int pos, int size) {
+    CompoundBuffer copy;
+    copy.CopyFrom(target_, pos, pos + size);
+    EXPECT_TRUE(CompareData(copy, data_->data() + pos, size));
+  }
+
+ protected:
+  virtual void SetUp() {
+    data_ = new IOBuffer(kDataSize);
+    for (int i = 0; i < kDataSize; ++i) {
+      data_->data()[i] = i;
+    }
+  }
+
+  // Iterate over chunks of data with sizes specified in |sizes| in the
+  // interval [0..kDataSize]. |function| is called for each chunk.
+  void IterateOverPieces(const int sizes[],
+                         Callback2<int, int>::Type* function) {
+    DCHECK_GT(sizes[0], 0);
+
+    int pos = 0;
+    int index = 0;
+    while (pos < kDataSize) {
+      int size = std::min(sizes[index], kDataSize - pos);
+      ++index;
+      if (sizes[index] <= 0)
+        index = 0;
+
+      function->Run(pos, size);
+
+      pos += size;
+    }
+    delete function;
+  }
+
+  bool CompareData(const CompoundBuffer& buffer, char* data, int size) {
+    scoped_refptr<IOBuffer> buffer_data = buffer.ToIOBufferWithSize();
+    return buffer.total_bytes() == size &&
+        memcmp(buffer_data->data(), data, size) == 0;
+  }
+
+  static size_t ReadFromInput(CompoundBufferInputStream* input,
+                              void* data, size_t size) {
+    uint8* out = reinterpret_cast<uint8*>(data);
+    int out_size = size;
+
+    const void* in;
+    int in_size = 0;
+
+    while (true) {
+      if (!input->Next(&in, &in_size)) {
+        return size - out_size;
+      }
+      EXPECT_GT(in_size, -1);
+
+      if (out_size <= in_size) {
+        memcpy(out, in, out_size);
+        if (in_size > out_size) {
+          input->BackUp(in_size - out_size);
+        }
+        return size;  // Copied all of it.
+      }
+
+      memcpy(out, in, in_size);
+      out += in_size;
+      out_size -= in_size;
+    }
+  }
+
+  static void ReadString(CompoundBufferInputStream* input,
+                         const std::string& str) {
+    SCOPED_TRACE(str);
+    scoped_array<char> buffer(new char[str.size() + 1]);
+    buffer[str.size()] = '\0';
+    EXPECT_EQ(ReadFromInput(input, buffer.get(), str.size()), str.size());
+    EXPECT_STREQ(str.data(), buffer.get());
+  }
+
+  // Construct and prepare data in the |output_stream|.
+  static void PrepareData(scoped_ptr<CompoundBuffer>* stream) {
+    static const std::string kTestData =
+        "Hello world!"
+        "This is testing"
+        "MultipleArrayInputStream"
+        "for Chromoting";
+
+    // Determine how many segments to split kTestData. We split the data in
+    // 1 character, 2 characters, 1 character, 2 characters ...
+    int segments = (kTestData.length() / 3) * 2;
+    int remaining_chars = kTestData.length() % 3;
+    if (remaining_chars) {
+      if (remaining_chars == 1)
+        ++segments;
+      else
+        segments += 2;
+    }
+
+    CompoundBuffer* mstream = new CompoundBuffer();

[awong, 2010/11/16 00:04:58]

Why is this called "mstream"?  Is there a more sensible name?

[Sergey Ulanov, 2010/11/16 01:25:09]

Done.

+    const char* data = kTestData.data();
+    for (int i = 0; i < segments; ++i) {
+      int size = i % 2 == 0 ? 1 : 2;
+      mstream->Append(new net::WrappedIOBuffer(data), size);
+      data += size;
+    }
+    mstream->Lock();
+    stream->reset(mstream);
+  }
+
+  CompoundBuffer target_;
+  scoped_refptr<IOBuffer> data_;
+};
+
+TEST_F(CompoundBufferTest, Append) {
+  target_.Clear();
+  IterateOverPieces(kChunkSizes0, NewCallback(
+      static_cast<CompoundBufferTest*>(this), &CompoundBufferTest::Append));
+  EXPECT_TRUE(CompareData(target_, data_->data(), kDataSize));
+
+  target_.Clear();
+  IterateOverPieces(kChunkSizes1, NewCallback(
+      static_cast<CompoundBufferTest*>(this), &CompoundBufferTest::Append));
+  EXPECT_TRUE(CompareData(target_, data_->data(), kDataSize));
+}
+
+TEST_F(CompoundBufferTest, AppendCopyOf) {
+  target_.Clear();
+  IterateOverPieces(kChunkSizes0, NewCallback(
+      static_cast<CompoundBufferTest*>(this),
+      &CompoundBufferTest::AppendCopyOf));
+  EXPECT_TRUE(CompareData(target_, data_->data(), kDataSize));
+
+  target_.Clear();
+  IterateOverPieces(kChunkSizes1, NewCallback(
+      static_cast<CompoundBufferTest*>(this),
+      &CompoundBufferTest::AppendCopyOf));
+  EXPECT_TRUE(CompareData(target_, data_->data(), kDataSize));
+}
+
+TEST_F(CompoundBufferTest, Prepend) {
+  target_.Clear();
+  IterateOverPieces(kChunkSizes0, NewCallback(
+      static_cast<CompoundBufferTest*>(this), &CompoundBufferTest::Prepend));
+  EXPECT_TRUE(CompareData(target_, data_->data(), kDataSize));
+
+  target_.Clear();
+  IterateOverPieces(kChunkSizes1, NewCallback(
+      static_cast<CompoundBufferTest*>(this), &CompoundBufferTest::Prepend));
+  EXPECT_TRUE(CompareData(target_, data_->data(), kDataSize));
+}
+
+TEST_F(CompoundBufferTest, PrependCopyOf) {
+  target_.Clear();
+  IterateOverPieces(kChunkSizes0, NewCallback(
+      static_cast<CompoundBufferTest*>(this),
+      &CompoundBufferTest::PrependCopyOf));
+  EXPECT_TRUE(CompareData(target_, data_->data(), kDataSize));
+
+  target_.Clear();
+  IterateOverPieces(kChunkSizes1, NewCallback(
+      static_cast<CompoundBufferTest*>(this),
+      &CompoundBufferTest::PrependCopyOf));
+  EXPECT_TRUE(CompareData(target_, data_->data(), kDataSize));
+}
+
+TEST_F(CompoundBufferTest, CopyFrom) {
+  target_.Clear();
+  IterateOverPieces(kChunkSizes1, NewCallback(
+      static_cast<CompoundBufferTest*>(this), &CompoundBufferTest::Append));
+  {
+    SCOPED_TRACE("CopyFrom.kCopySizes0");
+    IterateOverPieces(kCopySizes0, NewCallback(
+        static_cast<CompoundBufferTest*>(this),
+        &CompoundBufferTest::TestCopyFrom));
+  }
+  {
+    SCOPED_TRACE("CopyFrom.kCopySizes1");
+    IterateOverPieces(kCopySizes1, NewCallback(
+        static_cast<CompoundBufferTest*>(this),
+        &CompoundBufferTest::TestCopyFrom));
+  }
+}
+
+TEST_F(CompoundBufferTest, InputStream) {
+  scoped_ptr<CompoundBuffer> buffer;
+  PrepareData(&buffer);
+  CompoundBufferInputStream stream(buffer.get());
+
+  ReadString(&stream, "Hello world!");
+  ReadString(&stream, "This ");
+  ReadString(&stream, "is test");
+  EXPECT_TRUE(stream.Skip(3));
+  ReadString(&stream, "MultipleArrayInput");
+  EXPECT_TRUE(stream.Skip(6));
+  ReadString(&stream, "f");
+  ReadString(&stream, "o");
+  ReadString(&stream, "r");
+  ReadString(&stream, " ");
+  ReadString(&stream, "Chromoting");
+}
+
+}  // namespace remoting