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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "content_stream.h"
#include "dap/io.h"
#include <string.h> // strlen
#include <algorithm> // std::min
namespace dap {
////////////////////////////////////////////////////////////////////////////////
// ContentReader
////////////////////////////////////////////////////////////////////////////////
ContentReader::ContentReader(
const std::shared_ptr<Reader>& reader,
OnInvalidData on_invalid_data /* = OnInvalidData::kIgnore */)
: reader(reader), on_invalid_data(on_invalid_data) {}
ContentReader& ContentReader::operator=(ContentReader&& rhs) noexcept {
buf = std::move(rhs.buf);
reader = std::move(rhs.reader);
on_invalid_data = std::move(rhs.on_invalid_data);
return *this;
}
bool ContentReader::isOpen() {
return reader ? reader->isOpen() : false;
}
void ContentReader::close() {
if (reader) {
reader->close();
}
}
std::string ContentReader::read() {
// Find Content-Length header prefix
if (on_invalid_data == kClose) {
if (!match("Content-Length:")) {
return badHeader();
}
} else {
if (!scan("Content-Length:")) {
return "";
}
}
// Skip whitespace and tabs
while (matchAny(" \t")) {
}
// Parse length
size_t len = 0;
while (true) {
auto c = matchAny("0123456789");
if (c == 0) {
break;
}
len *= 10;
len += size_t(c) - size_t('0');
}
if (len == 0) {
return "";
}
// Expect \r\n\r\n
if (!match("\r\n\r\n")) {
return badHeader();
}
// Read message
if (!buffer(len)) {
return "";
}
std::string out;
out.reserve(len);
for (size_t i = 0; i < len; i++) {
out.push_back(static_cast<char>(buf.front()));
buf.pop_front();
}
return out;
}
bool ContentReader::scan(const uint8_t* seq, size_t len) {
while (buffer(len)) {
if (match(seq, len)) {
return true;
}
buf.pop_front();
}
return false;
}
bool ContentReader::scan(const char* str) {
auto len = strlen(str);
return scan(reinterpret_cast<const uint8_t*>(str), len);
}
bool ContentReader::match(const uint8_t* seq, size_t len) {
if (!buffer(len)) {
return false;
}
auto it = buf.begin();
for (size_t i = 0; i < len; i++, it++) {
if (*it != seq[i]) {
return false;
}
}
for (size_t i = 0; i < len; i++) {
buf.pop_front();
}
return true;
}
bool ContentReader::match(const char* str) {
auto len = strlen(str);
return match(reinterpret_cast<const uint8_t*>(str), len);
}
char ContentReader::matchAny(const char* chars) {
if (!buffer(1)) {
return false;
}
int c = buf.front();
if (auto p = strchr(chars, c)) {
buf.pop_front();
return *p;
}
return 0;
}
bool ContentReader::buffer(size_t bytes) {
if (bytes < buf.size()) {
return true;
}
bytes -= buf.size();
while (bytes > 0) {
uint8_t chunk[256];
auto numWant = std::min(sizeof(chunk), bytes);
auto numGot = reader->read(chunk, numWant);
if (numGot == 0) {
return false;
}
for (size_t i = 0; i < numGot; i++) {
buf.push_back(chunk[i]);
}
bytes -= numGot;
}
return true;
}
std::string ContentReader::badHeader() {
if (on_invalid_data == kClose) {
close();
}
return "";
}
////////////////////////////////////////////////////////////////////////////////
// ContentWriter
////////////////////////////////////////////////////////////////////////////////
ContentWriter::ContentWriter(const std::shared_ptr<Writer>& rhs)
: writer(rhs) {}
ContentWriter& ContentWriter::operator=(ContentWriter&& rhs) noexcept {
writer = std::move(rhs.writer);
return *this;
}
bool ContentWriter::isOpen() {
return writer ? writer->isOpen() : false;
}
void ContentWriter::close() {
if (writer) {
writer->close();
}
}
bool ContentWriter::write(const std::string& msg) const {
auto header =
std::string("Content-Length: ") + std::to_string(msg.size()) + "\r\n\r\n";
return writer->write(header.data(), header.size()) &&
writer->write(msg.data(), msg.size());
}
} // namespace dap
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