TGA RLE compressing ( writing ) algorithm on c++ - c++

Question

I found this code and I wonder why it does't works ..
// f is an stream
void writeTGA(ostream& f, bool rle) const{
f<<ubyte(0);//ID length
f<<ubyte(0);//Color map Type
if(rle)
f<<ubyte(10);//Image Type Code
else
f<<ubyte(2);//Image Type Code
f<<ubyte(0);//Color map stuff
f<<ubyte(0);
f<<ubyte(0);
f<<ubyte(0);
f<<ubyte(0);
f<<ubyte(0);//X Origin of Image
f<<ubyte(0);//X Origin of Image
f<<ubyte(0);//Y Origin of Image
f<<ubyte(0);//Y Origin of Image
f << ubyte(width%256);
f << ubyte(width>>8);
f << ubyte(height%256);
f << ubyte(height>>8);
f<<ubyte(24);//Image Pixels Size
f<<ubyte(32);//Image Descriptor Byte
if(rle)
{
cout<<"rleHeadHead"<<endl;
ubyte rleHead = 0;
ubyte diff[128];
int i = 0;
while(i<width*height)
{
rleHead = 1;
/* RLE */
if(i+1 < width*height)
while(pixels[i] == pixels[i+1]) {
if(i+1 >= width*height || rleHead >= 128)
break;
rleHead++;
i++;
}
if(rleHead > 1)
{
f<< (rleHead+127);
f<<pixels[i].b;
f<<pixels[i].g;
f<<pixels[i].r;
}
rleHead = 0;
/* RAW */
if(i+1 < width*height)
{
while(pixels[i+rleHead] != pixels[i+rleHead+1])
{
if( (i+rleHead+1) >= width*height || rleHead >= 128)
break;
rleHead++;
}
} else
rleHead++;
if(rleHead > 0)
{
f << (rleHead-1);
for(int j = 0; j < rleHead; j++)
{
diff[j] = pixels[i+j].b;
diff[j] = pixels[i+j].g;
diff[j] = pixels[i+j].r;
}
f.write((const char*) diff, rle*3);
i += rleHead;
}}}
else{
for(int i = 0 ; i < width*height ; i++){
f<< pixels[i].b;
f<< pixels[i].g;
f<< pixels[i].r;}
}
}
I tried to implement it and it seems not good ..
Otherwise, someone know if it exist a library or just a simple file where I can find this algorithm ?
Thanks you in advance