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AsyncPrinter.cpp
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AsyncPrinter.cpp
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/*
Asynchronous TCP library for Espressif MCUs
Copyright (c) 2016 Hristo Gochkov. All rights reserved.
This file is part of the esp8266 core for Arduino environment.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "AsyncPrinter.h"
AsyncPrinter::AsyncPrinter()
: _client(NULL)
, _data_cb(NULL)
, _data_arg(NULL)
, _close_cb(NULL)
, _close_arg(NULL)
, _tx_buffer(NULL)
, _tx_buffer_size(0)
, next(NULL)
{}
AsyncPrinter::AsyncPrinter(AsyncClient *client, size_t txBufLen)
: _client(client)
, _data_cb(NULL)
, _data_arg(NULL)
, _close_cb(NULL)
, _close_arg(NULL)
, _tx_buffer(NULL)
, _tx_buffer_size(txBufLen)
, next(NULL)
{
_attachCallbacks();
_tx_buffer = new cbuf(_tx_buffer_size);
}
AsyncPrinter::~AsyncPrinter(){
_on_close();
}
void AsyncPrinter::onData(ApDataHandler cb, void *arg){
_data_cb = cb;
_data_arg = arg;
}
void AsyncPrinter::onClose(ApCloseHandler cb, void *arg){
_close_cb = cb;
_close_arg = arg;
}
AsyncPrinter::operator bool(){ return connected(); }
AsyncPrinter & AsyncPrinter::operator=(const AsyncPrinter &other){
if(_client != NULL){
_client->abort();
_client->free();
_client = NULL;
}
_tx_buffer_size = other._tx_buffer_size;
if(_tx_buffer != NULL){
cbuf *b = _tx_buffer;
_tx_buffer = NULL;
delete b;
}
_tx_buffer = new cbuf(other._tx_buffer_size);
_client = other._client;
_attachCallbacks();
return *this;
}
size_t AsyncPrinter::write(uint8_t data){
return write(&data, 1);
}
size_t AsyncPrinter::write(const uint8_t *data, size_t len){
if(_tx_buffer == NULL || !connected())
return 0;
size_t toWrite = 0;
size_t toSend = len;
while(_tx_buffer->room() < toSend){
toWrite = _tx_buffer->room();
_tx_buffer->write((const char*)data, toWrite);
while(!_client->canSend())
delay(0);
_sendBuffer();
toSend -= toWrite;
}
_tx_buffer->write((const char*)(data+(len - toSend)), toSend);
while(!_client->canSend()) delay(0);
_sendBuffer();
return len;
}
bool AsyncPrinter::connected(){
return (_client != NULL && _client->connected());
}
void AsyncPrinter::close(){
if(_client != NULL)
_client->close();
}
size_t AsyncPrinter::_sendBuffer(){
size_t available = _tx_buffer->available();
if(!connected() || !_client->canSend() || available == 0)
return 0;
size_t sendable = _client->space();
if(sendable < available)
available= sendable;
char *out = new char[available];
_tx_buffer->read(out, available);
size_t sent = _client->write(out, available);
delete out;
return sent;
}
void AsyncPrinter::_onData(void *data, size_t len){
if(_data_cb)
_data_cb(_data_arg, this, (uint8_t*)data, len);
}
void AsyncPrinter::_on_close(){
if(_client != NULL){
_client = NULL;
}
if(_tx_buffer != NULL){
cbuf *b = _tx_buffer;
_tx_buffer = NULL;
delete b;
}
if(_close_cb)
_close_cb(_close_arg, this);
}
void AsyncPrinter::_attachCallbacks(){
_client->onPoll([](void *obj, AsyncClient* c){ ((AsyncPrinter*)(obj))->_sendBuffer(); }, this);
_client->onAck([](void *obj, AsyncClient* c, size_t len, uint32_t time){ ((AsyncPrinter*)(obj))->_sendBuffer(); }, this);
_client->onDisconnect([](void *obj, AsyncClient* c){ ((AsyncPrinter*)(obj))->_on_close(); c->free(); delete c; }, this);
_client->onData([](void *obj, AsyncClient* c, void *data, size_t len){ ((AsyncPrinter*)(obj))->_onData(data, len); }, this);
}