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/*
Copyright (C) 2005, 2006, 2007, 2008, 2009 Her Majesty the Queen in Right
of Canada (Communications Research Center Canada)
*/
/*
This file is part of ODR-DabMux.
ODR-DabMux 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 of the
License, or (at your option) any later version.
ODR-DabMux 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 ODR-DabMux. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Interleaver.h"
#include <string.h>
#ifdef _WIN32
# define bzero(a, b) memset((a), 0, (b))
#endif // _WIN32
Interleaver::Interleaver(unsigned short I, unsigned short M, bool reverse) :
I(I),
M(M),
N(I * M),
memSize((this->N * I) - 1)
{
mem.resize(memSize);
setReverse(reverse);
}
void Interleaver::setReverse(bool state)
{
reverse = state;
reset();
}
void Interleaver::reset()
{
j = 0;
index = 0;
memset(mem.data(), 0, memSize * sizeof(mem[0]));
}
void Interleaver::encode(void* data, unsigned long size)
{
encode(data, data, size);
}
void Interleaver::encode(const void* inData, void* outData, unsigned long size)
{
const char* input = reinterpret_cast<const char *>(inData);
char* output = reinterpret_cast<char *>(outData);
unsigned long i;
if (reverse) {
for (i = 0; i < size; ++i) {
mem[(index + ((I - 1 - j) * N)) % memSize] = *input;
*output = mem[index];
++input;
++output;
if (++j == I) {
j = 0;
}
if (++index == memSize) {
index = 0;
}
}
} else {
for (i = 0; i < size; ++i) {
if (j) {
mem[(index + (j * N)) % memSize] = *input;
*output = mem[index];
} else {
*output = *input;
}
++input;
++output;
if (++j == I) {
j = 0;
}
if (++index == memSize) {
index = 0;
}
}
}
}
unsigned long Interleaver::sync(void* data, unsigned long size, char padding)
{
char* input = reinterpret_cast<char *>(data);
unsigned long index;
if (reverse) {
for (index = 0; index < size; ++index) {
mem[(index + ((I - 1 - j) * N)) % memSize] = padding;
*input = mem[index];
++input;
if (++index == memSize) {
index = 0;
}
if (++j == I) {
j = 0;
break;
}
}
} else {
for (index = 0; index < size; ++index) {
mem[(index + (j * N)) % memSize] = padding;
*input = mem[index];
++input;
if (++index == memSize) {
index = 0;
}
if (++j == I) {
j = 0;
break;
}
}
}
return index;
}
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