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83 lines
2.9 KiB
83 lines
2.9 KiB
/*
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WebSocketIncommingBuffer
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Code by Hermann Kraus (https://bitbucket.org/hermr2d2/)
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and slightly modified.
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https://bitbucket.org/xoseperez/espurna/pull-requests/30/safer-buffer-handling-for-websocket-data
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*/
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#pragma once
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#define MAX_WS_MSG_SIZE 4000
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typedef std::function<void(AsyncWebSocketClient *client, uint8_t *data, size_t len)> AwsMessageHandler;
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class WebSocketIncommingBuffer {
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public:
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WebSocketIncommingBuffer(AwsMessageHandler cb, bool terminate_string = true, bool cb_on_fragments = false) :
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_cb(cb),
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_cb_on_fragments(cb_on_fragments),
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_terminate_string(terminate_string),
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_buffer(0)
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{}
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~WebSocketIncommingBuffer() {
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if (_buffer) delete _buffer;
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}
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void data_event(AsyncWebSocketClient *client, AwsFrameInfo *info, uint8_t *data, size_t len) {
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if((info->final || _cb_on_fragments) &&
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!_terminate_string && info->index == 0 && info->len == len) {
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/* The whole message is in a single frame and we got all of it's
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data therefore we can parse it without copying the data first.*/
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_cb(client, data, len);
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} else {
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if (info->len > MAX_WS_MSG_SIZE) return;
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/* Check if previous fragment was discarded because it was too long. */
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if (!_cb_on_fragments && info->num > 0 && !_buffer) return;
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if (!_buffer) {
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_buffer = new std::vector<uint8_t>();
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}
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if (info->index == 0) {
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//New frame => preallocate memory
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if (_cb_on_fragments) {
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_buffer->reserve(info->len + 1);
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} else {
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/* The current fragment would lead to a message which is
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too long. So discard everything received so far. */
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if (info->len + _buffer->size() > MAX_WS_MSG_SIZE) {
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delete _buffer;
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_buffer = 0;
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return;
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} else {
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_buffer->reserve(info->len + _buffer->size() + 1);
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}
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}
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}
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//assert(_buffer->size() == info->index);
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_buffer->insert(_buffer->end(), data, data+len);
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if (info->index + len == info->len &&
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(info->final || _cb_on_fragments)) {
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// Frame/message complete
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if (_terminate_string) {
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_buffer->push_back(0);
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}
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_cb(client, _buffer->data(), _buffer->size());
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_buffer->clear();
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}
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}
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}
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private:
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AwsMessageHandler _cb;
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bool _cb_on_fragments;
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bool _terminate_string;
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std::vector<uint8_t> *_buffer;
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};
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