mirror of
https://github.com/pelgraine/Meck.git
synced 2026-05-14 13:25:53 +02:00
pelgraine
134 lines
2.6 KiB
C++
134 lines
2.6 KiB
C++
/*
|
|
Copyright (c) 2016 Arduino LLC. All right reserved.
|
|
|
|
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 <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "PDMDoubleBuffer.h"
|
|
|
|
PDMDoubleBuffer::PDMDoubleBuffer() :
|
|
_size(DEFAULT_PDM_BUFFER_SIZE)
|
|
{
|
|
reset();
|
|
}
|
|
|
|
PDMDoubleBuffer::~PDMDoubleBuffer()
|
|
{
|
|
}
|
|
|
|
void PDMDoubleBuffer::setSize(int size)
|
|
{
|
|
_size = size;
|
|
}
|
|
|
|
void PDMDoubleBuffer::reset()
|
|
{
|
|
_buffer[0] = (uint8_t*)realloc(_buffer[0], _size);
|
|
_buffer[1] = (uint8_t*)realloc(_buffer[1], _size);
|
|
|
|
memset(_buffer[0], 0x00, _size);
|
|
memset(_buffer[1], 0x00, _size);
|
|
|
|
_index = 0;
|
|
_length[0] = 0;
|
|
_length[1] = 0;
|
|
_readOffset[0] = 0;
|
|
_readOffset[1] = 0;
|
|
}
|
|
|
|
size_t PDMDoubleBuffer::availableForWrite()
|
|
{
|
|
return (_size - (_length[_index] - _readOffset[_index]));
|
|
}
|
|
|
|
size_t PDMDoubleBuffer::write(const void *buffer, size_t size)
|
|
{
|
|
size_t space = availableForWrite();
|
|
|
|
if (size > space) {
|
|
size = space;
|
|
}
|
|
|
|
if (size == 0) {
|
|
return 0;
|
|
}
|
|
|
|
memcpy(&_buffer[_index][_length[_index]], buffer, size);
|
|
|
|
_length[_index] += size;
|
|
|
|
return size;
|
|
}
|
|
|
|
size_t PDMDoubleBuffer::read(void *buffer, size_t size)
|
|
{
|
|
size_t avail = available();
|
|
|
|
if (size > avail) {
|
|
size = avail;
|
|
}
|
|
|
|
if (size == 0) {
|
|
return 0;
|
|
}
|
|
|
|
memcpy(buffer, &_buffer[_index][_readOffset[_index]], size);
|
|
_readOffset[_index] += size;
|
|
|
|
return size;
|
|
}
|
|
|
|
size_t PDMDoubleBuffer::peek(void *buffer, size_t size)
|
|
{
|
|
size_t avail = available();
|
|
|
|
if (size > avail) {
|
|
size = avail;
|
|
}
|
|
|
|
if (size == 0) {
|
|
return 0;
|
|
}
|
|
|
|
memcpy(buffer, &_buffer[_index][_readOffset[_index]], size);
|
|
|
|
return size;
|
|
}
|
|
|
|
void* PDMDoubleBuffer::data()
|
|
{
|
|
return (void*)_buffer[_index];
|
|
}
|
|
|
|
size_t PDMDoubleBuffer::available()
|
|
{
|
|
return _length[_index] - _readOffset[_index];
|
|
}
|
|
|
|
void PDMDoubleBuffer::swap(int length)
|
|
{
|
|
if (_index == 0) {
|
|
_index = 1;
|
|
} else {
|
|
_index = 0;
|
|
}
|
|
|
|
_length[_index] = length;
|
|
_readOffset[_index] = 0;
|
|
}
|