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// Copyright 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 "http2/hpack/varint/hpack_varint_encoder.h"
#include "absl/base/macros.h"
#include "http2/platform/api/http2_string_utils.h"
#include "common/platform/api/quiche_test.h"
namespace http2 {
namespace test {
namespace {
struct {
uint8_t high_bits;
uint8_t prefix_length;
uint64_t value;
uint8_t expected_encoding;
} kShortTestData[] = {{0b10110010, 1, 0, 0b10110010},
{0b10101100, 2, 2, 0b10101110},
{0b10100000, 3, 6, 0b10100110},
{0b10110000, 4, 13, 0b10111101},
{0b10100000, 5, 8, 0b10101000},
{0b11000000, 6, 48, 0b11110000},
{0b10000000, 7, 99, 0b11100011},
// Example from RFC7541 C.1.
{0b00000000, 5, 10, 0b00001010}};
// Encode integers that fit in the prefix.
TEST(HpackVarintEncoderTest, Short) {
for (size_t i = 0; i < ABSL_ARRAYSIZE(kShortTestData); ++i) {
std::string output;
HpackVarintEncoder::Encode(kShortTestData[i].high_bits,
kShortTestData[i].prefix_length,
kShortTestData[i].value, &output);
ASSERT_EQ(1u, output.size());
EXPECT_EQ(kShortTestData[i].expected_encoding,
static_cast<uint8_t>(output[0]));
}
}
struct {
uint8_t high_bits;
uint8_t prefix_length;
uint64_t value;
const char* expected_encoding;
} kLongTestData[] = {
// One extension byte.
{0b10011000, 3, 103, "9f60"},
{0b10010000, 4, 57, "9f2a"},
{0b11000000, 5, 158, "df7f"},
{0b01000000, 6, 65, "7f02"},
{0b00000000, 7, 200, "7f49"},
// Two extension bytes.
{0b10011000, 3, 12345, "9fb260"},
{0b10010000, 4, 5401, "9f8a2a"},
{0b11000000, 5, 16327, "dfa87f"},
{0b01000000, 6, 399, "7fd002"},
{0b00000000, 7, 9598, "7fff49"},
// Three extension bytes.
{0b10011000, 3, 1579281, "9f8ab260"},
{0b10010000, 4, 689488, "9fc18a2a"},
{0b11000000, 5, 2085964, "dfada87f"},
{0b01000000, 6, 43103, "7fa0d002"},
{0b00000000, 7, 1212541, "7ffeff49"},
// Four extension bytes.
{0b10011000, 3, 202147110, "9f9f8ab260"},
{0b10010000, 4, 88252593, "9fa2c18a2a"},
{0b11000000, 5, 266999535, "dfd0ada87f"},
{0b01000000, 6, 5509304, "7ff9a0d002"},
{0b00000000, 7, 155189149, "7f9efeff49"},
// Six extension bytes.
{0b10011000, 3, 3311978140938, "9f83aa9f8ab260"},
{0b10010000, 4, 1445930244223, "9ff0b0a2c18a2a"},
{0b11000000, 5, 4374519874169, "dfda84d0ada87f"},
{0b01000000, 6, 90263420404, "7fb5fbf9a0d002"},
{0b00000000, 7, 2542616951118, "7fcff19efeff49"},
// Eight extension bytes.
{0b10011000, 3, 54263449861016696, "9ff19883aa9f8ab260"},
{0b10010000, 4, 23690121121119891, "9f84fdf0b0a2c18a2a"},
{0b11000000, 5, 71672133617889215, "dfa0dfda84d0ada87f"},
{0b01000000, 6, 1478875878881374, "7f9ff0b5fbf9a0d002"},
{0b00000000, 7, 41658236125045114, "7ffbc1cff19efeff49"},
// Ten extension bytes.
{0b10011000, 3, 12832019021693745307u, "9f94f1f19883aa9f8ab201"},
{0b10010000, 4, 9980690937382242223u, "9fa08f84fdf0b0a2c18a01"},
{0b11000000, 5, 12131360551794650846u, "dfbfdda0dfda84d0ada801"},
{0b01000000, 6, 15006530362736632796u, "7f9dc79ff0b5fbf9a0d001"},
{0b00000000, 7, 18445754019193211014u, "7f8790fbc1cff19efeff01"},
// Maximum value: 2^64-1.
{0b10011000, 3, 18446744073709551615u, "9ff8ffffffffffffffff01"},
{0b10010000, 4, 18446744073709551615u, "9ff0ffffffffffffffff01"},
{0b11000000, 5, 18446744073709551615u, "dfe0ffffffffffffffff01"},
{0b01000000, 6, 18446744073709551615u, "7fc0ffffffffffffffff01"},
{0b00000000, 7, 18446744073709551615u, "7f80ffffffffffffffff01"},
// Example from RFC7541 C.1.
{0b00000000, 5, 1337, "1f9a0a"},
};
// Encode integers that do not fit in the prefix.
TEST(HpackVarintEncoderTest, Long) {
// Test encoding byte by byte, also test encoding in
// a single ResumeEncoding() call.
for (size_t i = 0; i < ABSL_ARRAYSIZE(kLongTestData); ++i) {
std::string expected_encoding =
Http2HexDecode(kLongTestData[i].expected_encoding);
std::string output;
HpackVarintEncoder::Encode(kLongTestData[i].high_bits,
kLongTestData[i].prefix_length,
kLongTestData[i].value, &output);
EXPECT_EQ(expected_encoding, output);
}
}
struct {
uint8_t high_bits;
uint8_t prefix_length;
uint64_t value;
uint8_t expected_encoding_first_byte;
} kLastByteIsZeroTestData[] = {
{0b10110010, 1, 1, 0b10110011}, {0b10101100, 2, 3, 0b10101111},
{0b10101000, 3, 7, 0b10101111}, {0b10110000, 4, 15, 0b10111111},
{0b10100000, 5, 31, 0b10111111}, {0b11000000, 6, 63, 0b11111111},
{0b10000000, 7, 127, 0b11111111}, {0b00000000, 8, 255, 0b11111111}};
// Make sure that the encoder outputs the last byte even when it is zero. This
// happens exactly when encoding the value 2^prefix_length - 1.
TEST(HpackVarintEncoderTest, LastByteIsZero) {
for (size_t i = 0; i < ABSL_ARRAYSIZE(kLastByteIsZeroTestData); ++i) {
std::string output;
HpackVarintEncoder::Encode(kLastByteIsZeroTestData[i].high_bits,
kLastByteIsZeroTestData[i].prefix_length,
kLastByteIsZeroTestData[i].value, &output);
ASSERT_EQ(2u, output.size());
EXPECT_EQ(kLastByteIsZeroTestData[i].expected_encoding_first_byte,
static_cast<uint8_t>(output[0]));
EXPECT_EQ(0b00000000, output[1]);
}
}
// Test that encoder appends correctly to non-empty string.
TEST(HpackVarintEncoderTest, Append) {
std::string output("foo");
EXPECT_EQ(Http2HexDecode("666f6f"), output);
HpackVarintEncoder::Encode(0b10011000, 3, 103, &output);
EXPECT_EQ(Http2HexDecode("666f6f9f60"), output);
HpackVarintEncoder::Encode(0b10100000, 5, 8, &output);
EXPECT_EQ(Http2HexDecode("666f6f9f60a8"), output);
HpackVarintEncoder::Encode(0b10011000, 3, 202147110, &output);
EXPECT_EQ(Http2HexDecode("666f6f9f60a89f9f8ab260"), output);
}
} // namespace
} // namespace test
} // namespace http2
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