net/spdy/hpack_output_stream

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This source file includes following definitions.
TEST
EncodeUint32
TEST
TEST
TEST
TEST
TEST
TEST
TEST
TEST
TEST
TEST
TEST
TEST
TEST
TEST
TEST
TEST
TEST
TEST
// Copyright 2014 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 "net/spdy/hpack_output_stream.h"

#include <cstddef>

#include "base/basictypes.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace net {

namespace {

using std::string;

// Make sure that AppendBits() appends bits starting from the most
// significant bit, and that it can handle crossing a byte boundary.
TEST(HpackOutputStreamTest, AppendBits) {
  HpackOutputStream output_stream(kuint32max);
  string expected_str;

  output_stream.AppendBitsForTest(0x1, 1);
  expected_str.append(1, 0x00);
  *expected_str.rbegin() |= (0x1 << 7);

  output_stream.AppendBitsForTest(0x0, 1);

  output_stream.AppendBitsForTest(0x3, 2);
  *expected_str.rbegin() |= (0x3 << 4);

  output_stream.AppendBitsForTest(0x0, 2);

  // Byte-crossing append.
  output_stream.AppendBitsForTest(0x7, 3);
  *expected_str.rbegin() |= (0x7 >> 1);
  expected_str.append(1, 0x00);
  *expected_str.rbegin() |= (0x7 << 7);

  output_stream.AppendBitsForTest(0x0, 7);

  string str;
  output_stream.TakeString(&str);
  EXPECT_EQ(expected_str, str);
}

// Utility function to return I as a string encoded with an N-bit
// prefix.
string EncodeUint32(uint8 N, uint32 I) {
  HpackOutputStream output_stream(kuint32max);
  if (N < 8) {
    output_stream.AppendBitsForTest(0x00, 8 - N);
  }
  output_stream.AppendUint32ForTest(I);
  string str;
  output_stream.TakeString(&str);
  return str;
}

// The {Number}ByteIntegersEightBitPrefix tests below test that
// certain integers are encoded correctly with an 8-bit prefix in
// exactly {Number} bytes.

TEST(HpackOutputStreamTest, OneByteIntegersEightBitPrefix) {
  // Minimum.
  EXPECT_EQ(string("\x00", 1), EncodeUint32(8, 0x00));
  EXPECT_EQ("\x7f", EncodeUint32(8, 0x7f));
  // Maximum.
  EXPECT_EQ("\xfe", EncodeUint32(8, 0xfe));
}

TEST(HpackOutputStreamTest, TwoByteIntegersEightBitPrefix) {
  // Minimum.
  EXPECT_EQ(string("\xff\x00", 2), EncodeUint32(8, 0xff));
  EXPECT_EQ("\xff\x01", EncodeUint32(8, 0x0100));
  // Maximum.
  EXPECT_EQ("\xff\x7f", EncodeUint32(8, 0x017e));
}

TEST(HpackOutputStreamTest, ThreeByteIntegersEightBitPrefix) {
  // Minimum.
  EXPECT_EQ("\xff\x80\x01", EncodeUint32(8, 0x017f));
  EXPECT_EQ("\xff\x80\x1e", EncodeUint32(8, 0x0fff));
  // Maximum.
  EXPECT_EQ("\xff\xff\x7f", EncodeUint32(8, 0x40fe));
}

TEST(HpackOutputStreamTest, FourByteIntegersEightBitPrefix) {
  // Minimum.
  EXPECT_EQ("\xff\x80\x80\x01", EncodeUint32(8, 0x40ff));
  EXPECT_EQ("\xff\x80\xfe\x03", EncodeUint32(8, 0xffff));
  // Maximum.
  EXPECT_EQ("\xff\xff\xff\x7f", EncodeUint32(8, 0x002000fe));
}

TEST(HpackOutputStreamTest, FiveByteIntegersEightBitPrefix) {
  // Minimum.
  EXPECT_EQ("\xff\x80\x80\x80\x01", EncodeUint32(8, 0x002000ff));
  EXPECT_EQ("\xff\x80\xfe\xff\x07", EncodeUint32(8, 0x00ffffff));
  // Maximum.
  EXPECT_EQ("\xff\xff\xff\xff\x7f", EncodeUint32(8, 0x100000fe));
}

TEST(HpackOutputStreamTest, SixByteIntegersEightBitPrefix) {
  // Minimum.
  EXPECT_EQ("\xff\x80\x80\x80\x80\x01", EncodeUint32(8, 0x100000ff));
  // Maximum.
  EXPECT_EQ("\xff\x80\xfe\xff\xff\x0f", EncodeUint32(8, 0xffffffff));
}

// The {Number}ByteIntegersOneToSevenBitPrefix tests below test that
// certain integers are encoded correctly with an N-bit prefix in
// exactly {Number} bytes for N in {1, 2, ..., 7}.

TEST(HpackOutputStreamTest, OneByteIntegersOneToSevenBitPrefixes) {
  // Minimums.
  EXPECT_EQ(string("\x00", 1), EncodeUint32(7, 0x00));
  EXPECT_EQ(string("\x00", 1), EncodeUint32(6, 0x00));
  EXPECT_EQ(string("\x00", 1), EncodeUint32(5, 0x00));
  EXPECT_EQ(string("\x00", 1), EncodeUint32(4, 0x00));
  EXPECT_EQ(string("\x00", 1), EncodeUint32(3, 0x00));
  EXPECT_EQ(string("\x00", 1), EncodeUint32(2, 0x00));
  EXPECT_EQ(string("\x00", 1), EncodeUint32(1, 0x00));

  // Maximums.
  EXPECT_EQ("\x7e", EncodeUint32(7, 0x7e));
  EXPECT_EQ("\x3e", EncodeUint32(6, 0x3e));
  EXPECT_EQ("\x1e", EncodeUint32(5, 0x1e));
  EXPECT_EQ("\x0e", EncodeUint32(4, 0x0e));
  EXPECT_EQ("\x06", EncodeUint32(3, 0x06));
  EXPECT_EQ("\x02", EncodeUint32(2, 0x02));
  EXPECT_EQ(string("\x00", 1), EncodeUint32(1, 0x00));
}

TEST(HpackOutputStreamTest, TwoByteIntegersOneToSevenBitPrefixes) {
  // Minimums.
  EXPECT_EQ(string("\x7f\x00", 2), EncodeUint32(7, 0x7f));
  EXPECT_EQ(string("\x3f\x00", 2), EncodeUint32(6, 0x3f));
  EXPECT_EQ(string("\x1f\x00", 2), EncodeUint32(5, 0x1f));
  EXPECT_EQ(string("\x0f\x00", 2), EncodeUint32(4, 0x0f));
  EXPECT_EQ(string("\x07\x00", 2), EncodeUint32(3, 0x07));
  EXPECT_EQ(string("\x03\x00", 2), EncodeUint32(2, 0x03));
  EXPECT_EQ(string("\x01\x00", 2), EncodeUint32(1, 0x01));

  // Maximums.
  EXPECT_EQ("\x7f\x7f", EncodeUint32(7, 0xfe));
  EXPECT_EQ("\x3f\x7f", EncodeUint32(6, 0xbe));
  EXPECT_EQ("\x1f\x7f", EncodeUint32(5, 0x9e));
  EXPECT_EQ("\x0f\x7f", EncodeUint32(4, 0x8e));
  EXPECT_EQ("\x07\x7f", EncodeUint32(3, 0x86));
  EXPECT_EQ("\x03\x7f", EncodeUint32(2, 0x82));
  EXPECT_EQ("\x01\x7f", EncodeUint32(1, 0x80));
}

TEST(HpackOutputStreamTest, ThreeByteIntegersOneToSevenBitPrefixes) {
  // Minimums.
  EXPECT_EQ("\x7f\x80\x01", EncodeUint32(7, 0xff));
  EXPECT_EQ("\x3f\x80\x01", EncodeUint32(6, 0xbf));
  EXPECT_EQ("\x1f\x80\x01", EncodeUint32(5, 0x9f));
  EXPECT_EQ("\x0f\x80\x01", EncodeUint32(4, 0x8f));
  EXPECT_EQ("\x07\x80\x01", EncodeUint32(3, 0x87));
  EXPECT_EQ("\x03\x80\x01", EncodeUint32(2, 0x83));
  EXPECT_EQ("\x01\x80\x01", EncodeUint32(1, 0x81));

  // Maximums.
  EXPECT_EQ("\x7f\xff\x7f", EncodeUint32(7, 0x407e));
  EXPECT_EQ("\x3f\xff\x7f", EncodeUint32(6, 0x403e));
  EXPECT_EQ("\x1f\xff\x7f", EncodeUint32(5, 0x401e));
  EXPECT_EQ("\x0f\xff\x7f", EncodeUint32(4, 0x400e));
  EXPECT_EQ("\x07\xff\x7f", EncodeUint32(3, 0x4006));
  EXPECT_EQ("\x03\xff\x7f", EncodeUint32(2, 0x4002));
  EXPECT_EQ("\x01\xff\x7f", EncodeUint32(1, 0x4000));
}

TEST(HpackOutputStreamTest, FourByteIntegersOneToSevenBitPrefixes) {
  // Minimums.
  EXPECT_EQ("\x7f\x80\x80\x01", EncodeUint32(7, 0x407f));
  EXPECT_EQ("\x3f\x80\x80\x01", EncodeUint32(6, 0x403f));
  EXPECT_EQ("\x1f\x80\x80\x01", EncodeUint32(5, 0x401f));
  EXPECT_EQ("\x0f\x80\x80\x01", EncodeUint32(4, 0x400f));
  EXPECT_EQ("\x07\x80\x80\x01", EncodeUint32(3, 0x4007));
  EXPECT_EQ("\x03\x80\x80\x01", EncodeUint32(2, 0x4003));
  EXPECT_EQ("\x01\x80\x80\x01", EncodeUint32(1, 0x4001));

  // Maximums.
  EXPECT_EQ("\x7f\xff\xff\x7f", EncodeUint32(7, 0x20007e));
  EXPECT_EQ("\x3f\xff\xff\x7f", EncodeUint32(6, 0x20003e));
  EXPECT_EQ("\x1f\xff\xff\x7f", EncodeUint32(5, 0x20001e));
  EXPECT_EQ("\x0f\xff\xff\x7f", EncodeUint32(4, 0x20000e));
  EXPECT_EQ("\x07\xff\xff\x7f", EncodeUint32(3, 0x200006));
  EXPECT_EQ("\x03\xff\xff\x7f", EncodeUint32(2, 0x200002));
  EXPECT_EQ("\x01\xff\xff\x7f", EncodeUint32(1, 0x200000));
}

TEST(HpackOutputStreamTest, FiveByteIntegersOneToSevenBitPrefixes) {
  // Minimums.
  EXPECT_EQ("\x7f\x80\x80\x80\x01", EncodeUint32(7, 0x20007f));
  EXPECT_EQ("\x3f\x80\x80\x80\x01", EncodeUint32(6, 0x20003f));
  EXPECT_EQ("\x1f\x80\x80\x80\x01", EncodeUint32(5, 0x20001f));
  EXPECT_EQ("\x0f\x80\x80\x80\x01", EncodeUint32(4, 0x20000f));
  EXPECT_EQ("\x07\x80\x80\x80\x01", EncodeUint32(3, 0x200007));
  EXPECT_EQ("\x03\x80\x80\x80\x01", EncodeUint32(2, 0x200003));
  EXPECT_EQ("\x01\x80\x80\x80\x01", EncodeUint32(1, 0x200001));

  // Maximums.
  EXPECT_EQ("\x7f\xff\xff\xff\x7f", EncodeUint32(7, 0x1000007e));
  EXPECT_EQ("\x3f\xff\xff\xff\x7f", EncodeUint32(6, 0x1000003e));
  EXPECT_EQ("\x1f\xff\xff\xff\x7f", EncodeUint32(5, 0x1000001e));
  EXPECT_EQ("\x0f\xff\xff\xff\x7f", EncodeUint32(4, 0x1000000e));
  EXPECT_EQ("\x07\xff\xff\xff\x7f", EncodeUint32(3, 0x10000006));
  EXPECT_EQ("\x03\xff\xff\xff\x7f", EncodeUint32(2, 0x10000002));
  EXPECT_EQ("\x01\xff\xff\xff\x7f", EncodeUint32(1, 0x10000000));
}

TEST(HpackOutputStreamTest, SixByteIntegersOneToSevenBitPrefixes) {
  // Minimums.
  EXPECT_EQ("\x7f\x80\x80\x80\x80\x01", EncodeUint32(7, 0x1000007f));
  EXPECT_EQ("\x3f\x80\x80\x80\x80\x01", EncodeUint32(6, 0x1000003f));
  EXPECT_EQ("\x1f\x80\x80\x80\x80\x01", EncodeUint32(5, 0x1000001f));
  EXPECT_EQ("\x0f\x80\x80\x80\x80\x01", EncodeUint32(4, 0x1000000f));
  EXPECT_EQ("\x07\x80\x80\x80\x80\x01", EncodeUint32(3, 0x10000007));
  EXPECT_EQ("\x03\x80\x80\x80\x80\x01", EncodeUint32(2, 0x10000003));
  EXPECT_EQ("\x01\x80\x80\x80\x80\x01", EncodeUint32(1, 0x10000001));

  // Maximums.
  EXPECT_EQ("\x7f\x80\xff\xff\xff\x0f", EncodeUint32(7, 0xffffffff));
  EXPECT_EQ("\x3f\xc0\xff\xff\xff\x0f", EncodeUint32(6, 0xffffffff));
  EXPECT_EQ("\x1f\xe0\xff\xff\xff\x0f", EncodeUint32(5, 0xffffffff));
  EXPECT_EQ("\x0f\xf0\xff\xff\xff\x0f", EncodeUint32(4, 0xffffffff));
  EXPECT_EQ("\x07\xf8\xff\xff\xff\x0f", EncodeUint32(3, 0xffffffff));
  EXPECT_EQ("\x03\xfc\xff\xff\xff\x0f", EncodeUint32(2, 0xffffffff));
  EXPECT_EQ("\x01\xfe\xff\xff\xff\x0f", EncodeUint32(1, 0xffffffff));
}

// Test that encoding an integer with an N-bit prefix preserves the
// upper (8-N) bits of the first byte.
TEST(HpackOutputStreamTest, AppendUint32PreservesUpperBits) {
  HpackOutputStream output_stream(kuint32max);
  output_stream.AppendBitsForTest(0x7f, 7);
  output_stream.AppendUint32ForTest(0x01);
  string str;
  output_stream.TakeString(&str);
  EXPECT_EQ(string("\xff\x00", 2), str);
}

// Test that encoding a string literal without huffman encoding
// encodes the size first with a 7-bit prefix and then the bytes of
// the string.
TEST(HpackOutputStreamTest, AppendStringLiteralNoHuffmanEncoding) {
  HpackOutputStream output_stream(kuint32max);

  string literal(0x7f, 'x');
  EXPECT_TRUE(output_stream.AppendStringLiteralForTest(literal));

  string str;
  output_stream.TakeString(&str);
  EXPECT_EQ(string("\x7f\x00", 2) + literal, str);
}

// Test that trying to encode a too-long string literal will fail.
TEST(HpackOutputStreamTest, AppendStringLiteralTooLong) {
  HpackOutputStream output_stream(kuint32max - 1);

  EXPECT_FALSE(output_stream.AppendStringLiteralForTest(
      base::StringPiece(NULL, kuint32max)));
}

// Test that encoding an indexed header simply encodes the index.
TEST(HpackOutputStreamTest, AppendIndexedHeader) {
  HpackOutputStream output_stream(kuint32max);
  output_stream.AppendIndexedHeader(0xffffffff);

  string str;
  output_stream.TakeString(&str);
  EXPECT_EQ("\xff\x80\xff\xff\xff\x0f", str);
}

// Test that encoding a literal header without indexing with a name
// encodes both the name and value as string literals.
TEST(HpackOutputStreamTest, AppendLiteralHeaderNoIndexingWithName) {
  HpackOutputStream output_stream(kuint32max);
  EXPECT_TRUE(
      output_stream.AppendLiteralHeaderNoIndexingWithName("name", "value"));

  string str;
  output_stream.TakeString(&str);
  EXPECT_EQ("\x40\x04name\x05value", str);
}

// Test that trying to encode a header with a too-long header name or
// value will fail.
TEST(HpackOutputStreamTest, AppendLiteralHeaderNoIndexingWithNameTooLong) {
  {
    HpackOutputStream output_stream(10);
    EXPECT_FALSE(output_stream.AppendLiteralHeaderNoIndexingWithName(
        "name", "too-long value"));
  }
  {
    HpackOutputStream output_stream(10);
    EXPECT_FALSE(output_stream.AppendLiteralHeaderNoIndexingWithName(
        "too-long name", "value"));
  }
}

}  // namespace

}  // namespace net
/* [<][>][^][v][top][bottom][index][help] */
root/net/spdy/hpack_output_stream_test.cc

DEFINITIONS
