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berclass.cpp
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berclass.cpp
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#include "BerClass.h"
#include <bitset>
#include <random>
#include <time.h>
#include <sys/stat.h>
#include <stdint.h>
#include <QFileInfo>
BerClass::BerClass()
{
}
BerClass::~BerClass()
{
}
long BerClass::getFileSize(const char* filename)
{
struct stat st;
stat(filename, &st);
off_t fileSize = st.st_size;
if (fileSize <= 0)
{
return -1;
}
return fileSize;
}
int BerClass::simulateBer(const char* filename,const char* saveFilename, double ber)
{
if (ber>1 || ber<0)
{
error="Wrong BER value.";
return -1;
}
filesize=getFileSize(filename);
if(filesize<=0)
{
error="Wrong file size or filename.";
return -1;
}
fopen_s(&file,filename,"rb");
if(file==NULL)
{
error="Cannot open file for reading.";
return -1;
}
fopen_s(&saveFile,saveFilename,"wb");
if(saveFile==NULL)
{
error="Cannot open file for writting.";
fclose(file);
return -1;
}
uint8_t b = 0;
uint8_t *buffer = new uint8_t[filesize];
double min = 1;
double max = pow(10,30);
std::uniform_real_distribution<double> unif(min,max);
std::default_random_engine re;
re.seed((unsigned)time(NULL));
if(fread_s(buffer,filesize,1,filesize,file)==filesize)
{
unsigned char *p = buffer;
for(int u=0;u<filesize;u++)
{
for(int i=0;i<8;i++)
{
double val = unif(re);
val=val/max;
if(val<ber)
{
b = (b << 1) + 1;
}
else
{
b = b << 1;
}
}
*p^=b; //modify bits
p++;
b=0;
}
fwrite(buffer,sizeof(uint8_t),filesize,saveFile);
fclose(saveFile);
}
fclose(file);
delete buffer;
return 0;
}