bool decrunch(RGBE *_scanline, int _len, FILE *_file)
{
int i, j;
if (_len < MINELEN || _len > MAXELEN)
return oldDecrunch(_scanline, _len, _file);
i = fgetc(_file);
if (i != 2)
{
fseek(_file, -1, SEEK_CUR);
return oldDecrunch(_scanline, _len, _file);
}
_scanline[0][G] = fgetc(_file);
_scanline[0][B] = fgetc(_file);
i = fgetc(_file);
if (_scanline[0][G] != 2 || _scanline[0][B] & 128)
{
_scanline[0][R] = 2;
_scanline[0][E] = i;
return oldDecrunch(_scanline + 1, _len - 1, _file);
}
// read each component
for (i = 0; i < 4; i++)
{
for (j = 0; j < _len;)
{
unsigned char code = fgetc(_file);
if (code > 128) // run
{
code &= 127;
unsigned char val = fgetc(_file);
while (code--)
_scanline[j++][i] = val;
}
else // non-run
{
while (code--)
_scanline[j++][i] = fgetc(_file);
}
}
}
return feof(_file) ? false : true;
}
bool decrunch(RGBE *scanline, int len, FILE *file)
{
int i, j;
if (len < MINELEN || len > MAXELEN)
return oldDecrunch(scanline, len, file);
i = fgetc(file);
if (i != 2) {
fseek(file, -1, SEEK_CUR);
return oldDecrunch(scanline, len, file);
}
scanline[0][G] = fgetc(file);
scanline[0][B] = fgetc(file);
i = fgetc(file);
if (scanline[0][G] != 2 || scanline[0][B] & 128) {
scanline[0][R] = 2;
scanline[0][E] = i;
return oldDecrunch(scanline + 1, len - 1, file);
}
// read each component
for (i = 0; i < 4; i++) {
for (j = 0; j < len; ) {
unsigned char code = fgetc(file);
if (code > 128) { // run
code &= 127;
unsigned char val = fgetc(file);
while (code--)
scanline[j++][i] = val;
}
else { // non-run
while(code--)
scanline[j++][i] = fgetc(file);
}
}
}
return feof(file) ? false : true;
}