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/* -*- c++ -*- */
/* Copyright 2015 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <algorithm>
#include <stdexcept>
#include <volk/volk.h>
#include <gnuradio/digital/header_buffer.h>
namespace gr {
namespace digital {
header_buffer::header_buffer(uint8_t *bytes_out)
{
d_offset = 0;
d_buffer = bytes_out;
}
header_buffer::~header_buffer()
{
}
void
header_buffer::clear()
{
if(d_buffer) // TX mode
d_offset = 0;
else // RX mode
d_input.clear();
}
size_t
header_buffer::length() const
{
if(d_buffer) // TX mode
return d_offset;
else // RX mode
return d_input.size();
}
const uint8_t*
header_buffer::header() const
{
return d_buffer;
}
void
header_buffer::add_field8(uint8_t data, int len, bool bs)
{
int nbytes = len/8;
if(d_buffer) {
memcpy(&d_buffer[d_offset], &data, nbytes);
d_offset += nbytes;
}
}
void
header_buffer::add_field16(uint16_t data, int len, bool bs)
{
int nbytes = len/8;
if(d_buffer) {
uint16_t x = data;
if(!bs) {
volk_16u_byteswap(&x, 1);
x = x >> (16-len);
}
memcpy(&d_buffer[d_offset], &x, nbytes);
d_offset += nbytes;
}
}
void
header_buffer::add_field32(uint32_t data, int len, bool bs)
{
int nbytes = len/8;
if(d_buffer) {
uint32_t x = data;
if(!bs) {
volk_32u_byteswap(&x, 1);
x = x >> (32-len);
}
memcpy(&d_buffer[d_offset], &x, nbytes);
d_offset += nbytes;
}
}
void
header_buffer::add_field64(uint64_t data, int len, bool bs)
{
int nbytes = len/8;
if(d_buffer) {
uint64_t x = data;
if(!bs) {
volk_64u_byteswap(&x, 1);
x = x >> (64-len);
}
memcpy(&d_buffer[d_offset], &x, nbytes);
d_offset += nbytes;
}
}
void
header_buffer::insert_bit(int bit)
{
d_input.push_back(bit);
}
uint8_t
header_buffer::extract_field8(int pos, int len, bool bs)
{
if(len > 8) {
throw std::runtime_error("header_buffer::extract_field for "
"uint8_t length must be <= 8");
}
uint8_t field = 0x00;
std::vector<bool>::iterator itr;
for(itr = d_input.begin()+pos; itr != d_input.begin()+pos+len; itr++) {
field = (field << 1) | ((*itr) & 0x1);
}
return field;
}
uint16_t
header_buffer::extract_field16(int pos, int len, bool bs)
{
if(len > 16) {
throw std::runtime_error("header_buffer::extract_field for "
"uint16_t length must be <= 16");
}
uint16_t field = 0x0000;
std::vector<bool>::iterator itr;
for(itr = d_input.begin()+pos; itr != d_input.begin()+pos+len; itr++) {
field = (field << 1) | ((*itr) & 0x1);
}
if(bs) {
volk_16u_byteswap(&field, 1);
}
return field;
}
uint32_t
header_buffer::extract_field32(int pos, int len, bool bs)
{
if(len > 32) {
throw std::runtime_error("header_buffer::extract_field for "
"uint32_t length must be <= 32");
}
uint32_t field = 0x00000000;
std::vector<bool>::iterator itr;
for(itr = d_input.begin()+pos; itr != d_input.begin()+pos+len; itr++) {
field = (field << 1) | ((*itr) & 0x1);
}
if(bs) {
volk_32u_byteswap(&field, 1);
}
return field;
}
uint64_t
header_buffer::extract_field64(int pos, int len, bool bs)
{
if(len > 64) {
throw std::runtime_error("header_buffer::extract_field for "
"uint64_t length must be <= 64");
}
uint64_t field = 0x0000000000000000;
std::vector<bool>::iterator itr;
for(itr = d_input.begin()+pos; itr != d_input.begin()+pos+len; itr++) {
field = (field << 1) | ((*itr) & 0x1);
}
if(bs) {
volk_64u_byteswap(&field, 1);
}
return field;
}
} /* namespace digital */
} /* namespace gr */
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