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/*
ByteBuffer.cpp - A circular buffer implementation for Arduino
Created by Sigurdur Orn, July 19, 2010.
siggi@mit.edu
*/
#include <util/atomic.h>
#include "WProgram.h"
#include "ByteBuffer.h"
ByteBuffer::ByteBuffer(){
}
void ByteBuffer::init(unsigned int buf_length){
data = (byte*)malloc(sizeof(byte)*buf_length);
capacity = buf_length;
position = 0;
length = 0;
}
void ByteBuffer::deAllocate(){
free(data);
}
void ByteBuffer::clear(){
position = 0;
length = 0;
}
int ByteBuffer::getSize(){
return length;
}
int ByteBuffer::getCapacity(){
return capacity;
}
byte ByteBuffer::peek(unsigned int index){
byte b = data[(position+index)%capacity];
return b;
}
int ByteBuffer::put(byte in){
if(length < capacity){
// save data byte at end of buffer
data[(position+length) % capacity] = in;
// increment the length
length++;
return 1;
}
// return failure
return 0;
}
int ByteBuffer::putInFront(byte in){
if(length < capacity){
// save data byte at end of buffer
if( position == 0 )
position = capacity-1;
else
position = (position-1)%capacity;
data[position] = in;
// increment the length
length++;
return 1;
}
// return failure
return 0;
}
byte ByteBuffer::get(){
byte b = 0;
if(length > 0){
b = data[position];
// move index down and decrement length
position = (position+1)%capacity;
length--;
}
return b;
}
byte ByteBuffer::getFromBack(){
byte b = 0;
if(length > 0){
b = data[(position+length-1)%capacity];
length--;
}
return b;
}
//
// Ints
//
int ByteBuffer::putIntInFront(int in){
byte *pointer = (byte *)∈
putInFront(pointer[0]);
putInFront(pointer[1]);
}
int ByteBuffer::putInt(int in){
byte *pointer = (byte *)∈
put(pointer[1]);
put(pointer[0]);
}
int ByteBuffer::getInt(){
int ret;
byte *pointer = (byte *)&ret;
pointer[1] = get();
pointer[0] = get();
return ret;
}
int ByteBuffer::getIntFromBack(){
int ret;
byte *pointer = (byte *)&ret;
pointer[0] = getFromBack();
pointer[1] = getFromBack();
return ret;
}
//
// Longs
//
int ByteBuffer::putLongInFront(long in){
byte *pointer = (byte *)∈
putInFront(pointer[0]);
putInFront(pointer[1]);
putInFront(pointer[2]);
putInFront(pointer[3]);
}
int ByteBuffer::putLong(long in){
byte *pointer = (byte *)∈
put(pointer[3]);
put(pointer[2]);
put(pointer[1]);
put(pointer[0]);
}
long ByteBuffer::getLong(){
long ret;
byte *pointer = (byte *)&ret;
pointer[3] = get();
pointer[2] = get();
pointer[1] = get();
pointer[0] = get();
return ret;
}
long ByteBuffer::getLongFromBack(){
long ret;
byte *pointer = (byte *)&ret;
pointer[0] = getFromBack();
pointer[1] = getFromBack();
pointer[2] = getFromBack();
pointer[3] = getFromBack();
return ret;
}
//
// Floats
//
int ByteBuffer::putFloatInFront(float in){
byte *pointer = (byte *)∈
putInFront(pointer[0]);
putInFront(pointer[1]);
putInFront(pointer[2]);
putInFront(pointer[3]);
}
int ByteBuffer::putFloat(float in){
byte *pointer = (byte *)∈
put(pointer[3]);
put(pointer[2]);
put(pointer[1]);
put(pointer[0]);
}
float ByteBuffer::getFloat(){
float ret;
byte *pointer = (byte *)&ret;
pointer[3] = get();
pointer[2] = get();
pointer[1] = get();
pointer[0] = get();
return ret;
}
float ByteBuffer::getFloatFromBack(){
float ret;
byte *pointer = (byte *)&ret;
pointer[0] = getFromBack();
pointer[1] = getFromBack();
pointer[2] = getFromBack();
pointer[3] = getFromBack();
return ret;
}
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