tdlight/tdnet/td/net/HttpChunkedByteFlow.cpp

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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/net/HttpChunkedByteFlow.h"
#include "td/utils/find_boundary.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/misc.h"
#include "td/utils/Status.h"
namespace td {
bool HttpChunkedByteFlow::loop() {
bool result = false;
do {
if (state_ == State::ReadChunkLength) {
bool ok = find_boundary(input_->clone(), "\r\n", len_);
if (len_ > 10) {
finish(Status::Error(PSLICE() << "Too long length in chunked "
<< input_->cut_head(len_).move_as_buffer_slice().as_slice()));
return false;
}
if (!ok) {
set_need_size(input_->size() + 1);
break;
}
auto s_len = input_->cut_head(len_).move_as_buffer_slice();
input_->advance(2);
len_ = hex_to_integer<size_t>(s_len.as_slice());
if (len_ > MAX_CHUNK_SIZE) {
finish(Status::Error(PSLICE() << "Invalid chunk size " << tag("size", len_)));
return false;
}
save_len_ = len_;
state_ = State::ReadChunkContent;
}
auto size = input_->size();
auto ready = min(len_, size);
auto need_size = min(MIN_UPDATE_SIZE, len_ + 2);
if (size < need_size) {
set_need_size(need_size);
break;
}
total_size_ += ready;
uncommited_size_ += ready;
if (total_size_ > MAX_SIZE) {
finish(Status::Error(PSLICE() << "Too big query " << tag("size", input_->size())));
return false;
}
output_.append(input_->cut_head(ready));
result = true;
len_ -= ready;
if (uncommited_size_ >= MIN_UPDATE_SIZE) {
uncommited_size_ = 0;
}
if (len_ == 0) {
if (input_->size() < 2) {
need_size = 2;
break;
}
input_->advance(2);
total_size_ += 2;
if (save_len_ == 0) {
finish(Status::OK());
return false;
}
state_ = State::ReadChunkLength;
len_ = 0;
}
} while (0);
if (!is_input_active_ && !result) {
finish(Status::Error("Unexpected end of stream"));
}
return result;
}
} // namespace td