blob: d6cd11059f4889a6218efcbb2b8e9bcb05373a85 [file] [log] [blame]
// 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/tools/http2_frame_builder.h"
#ifdef WIN32
#include <winsock2.h> // for htonl() functions
#else
#include <arpa/inet.h>
#include <netinet/in.h> // for htonl, htons
#endif
#include "http2/platform/api/http2_string_utils.h"
#include "common/platform/api/quiche_test.h"
namespace http2 {
namespace test {
Http2FrameBuilder::Http2FrameBuilder(Http2FrameType type,
uint8_t flags,
uint32_t stream_id) {
AppendUInt24(0); // Frame payload length, unknown so far.
Append(type);
AppendUInt8(flags);
AppendUInt31(stream_id);
}
Http2FrameBuilder::Http2FrameBuilder(const Http2FrameHeader& v) {
Append(v);
}
void Http2FrameBuilder::Append(absl::string_view s) {
Http2StrAppend(&buffer_, s);
}
void Http2FrameBuilder::AppendBytes(const void* data, uint32_t num_bytes) {
Append(absl::string_view(static_cast<const char*>(data), num_bytes));
}
void Http2FrameBuilder::AppendZeroes(size_t num_zero_bytes) {
char zero = 0;
buffer_.append(num_zero_bytes, zero);
}
void Http2FrameBuilder::AppendUInt8(uint8_t value) {
AppendBytes(&value, 1);
}
void Http2FrameBuilder::AppendUInt16(uint16_t value) {
value = htons(value);
AppendBytes(&value, 2);
}
void Http2FrameBuilder::AppendUInt24(uint32_t value) {
// Doesn't make sense to try to append a larger value, as that doesn't
// simulate something an encoder could do (i.e. the other 8 bits simply aren't
// there to be occupied).
EXPECT_EQ(value, value & 0xffffff);
value = htonl(value);
AppendBytes(reinterpret_cast<char*>(&value) + 1, 3);
}
void Http2FrameBuilder::AppendUInt31(uint32_t value) {
// If you want to test the high-bit being set, call AppendUInt32 instead.
uint32_t tmp = value & StreamIdMask();
EXPECT_EQ(value, value & StreamIdMask())
<< "High-bit of uint32_t should be clear.";
value = htonl(tmp);
AppendBytes(&value, 4);
}
void Http2FrameBuilder::AppendUInt32(uint32_t value) {
value = htonl(value);
AppendBytes(&value, sizeof(value));
}
void Http2FrameBuilder::Append(Http2ErrorCode error_code) {
AppendUInt32(static_cast<uint32_t>(error_code));
}
void Http2FrameBuilder::Append(Http2FrameType type) {
AppendUInt8(static_cast<uint8_t>(type));
}
void Http2FrameBuilder::Append(Http2SettingsParameter parameter) {
AppendUInt16(static_cast<uint16_t>(parameter));
}
void Http2FrameBuilder::Append(const Http2FrameHeader& v) {
AppendUInt24(v.payload_length);
Append(v.type);
AppendUInt8(v.flags);
AppendUInt31(v.stream_id);
}
void Http2FrameBuilder::Append(const Http2PriorityFields& v) {
// The EXCLUSIVE flag is the high-bit of the 32-bit stream dependency field.
uint32_t tmp = v.stream_dependency & StreamIdMask();
EXPECT_EQ(tmp, v.stream_dependency);
if (v.is_exclusive) {
tmp |= 0x80000000;
}
AppendUInt32(tmp);
// The PRIORITY frame's weight field is logically in the range [1, 256],
// but is encoded as a byte in the range [0, 255].
ASSERT_LE(1u, v.weight);
ASSERT_LE(v.weight, 256u);
AppendUInt8(v.weight - 1);
}
void Http2FrameBuilder::Append(const Http2RstStreamFields& v) {
Append(v.error_code);
}
void Http2FrameBuilder::Append(const Http2SettingFields& v) {
Append(v.parameter);
AppendUInt32(v.value);
}
void Http2FrameBuilder::Append(const Http2PushPromiseFields& v) {
AppendUInt31(v.promised_stream_id);
}
void Http2FrameBuilder::Append(const Http2PingFields& v) {
AppendBytes(v.opaque_bytes, sizeof Http2PingFields::opaque_bytes);
}
void Http2FrameBuilder::Append(const Http2GoAwayFields& v) {
AppendUInt31(v.last_stream_id);
Append(v.error_code);
}
void Http2FrameBuilder::Append(const Http2WindowUpdateFields& v) {
EXPECT_NE(0u, v.window_size_increment) << "Increment must be non-zero.";
AppendUInt31(v.window_size_increment);
}
void Http2FrameBuilder::Append(const Http2AltSvcFields& v) {
AppendUInt16(v.origin_length);
}
void Http2FrameBuilder::Append(const Http2PriorityUpdateFields& v) {
AppendUInt31(v.prioritized_stream_id);
}
// Methods for changing existing buffer contents.
void Http2FrameBuilder::WriteAt(absl::string_view s, size_t offset) {
ASSERT_LE(offset, buffer_.size());
size_t len = offset + s.size();
if (len > buffer_.size()) {
buffer_.resize(len);
}
for (size_t ndx = 0; ndx < s.size(); ++ndx) {
buffer_[offset + ndx] = s[ndx];
}
}
void Http2FrameBuilder::WriteBytesAt(const void* data,
uint32_t num_bytes,
size_t offset) {
WriteAt(absl::string_view(static_cast<const char*>(data), num_bytes), offset);
}
void Http2FrameBuilder::WriteUInt24At(uint32_t value, size_t offset) {
ASSERT_LT(value, static_cast<uint32_t>(1 << 24));
value = htonl(value);
WriteBytesAt(reinterpret_cast<char*>(&value) + 1, sizeof(value) - 1, offset);
}
void Http2FrameBuilder::SetPayloadLength(uint32_t payload_length) {
WriteUInt24At(payload_length, 0);
}
size_t Http2FrameBuilder::SetPayloadLength() {
EXPECT_GE(size(), Http2FrameHeader::EncodedSize());
uint32_t payload_length = size() - Http2FrameHeader::EncodedSize();
SetPayloadLength(payload_length);
return payload_length;
}
} // namespace test
} // namespace http2