/**
* Extract data from a JPEG image
*
* @param string $data Image raw data
*
* @return array Image raw data array
*/
public function getData($data)
{
$data['filter'] = 'DCTDecode';
$data['data'] = $data['raw'];
$byte = new Byte($data['raw']);
// extract embedded ICC profile (if any)
$icc = array();
$offset = 0;
while (($pos = strpos($data['raw'], 'ICC_PROFILE' . "", $offset)) !== false) {
// get ICC sequence length
$length = $byte->getUShort($pos - 2) - 16;
// marker sequence number
$msn = max(1, ord($data['raw'][$pos + 12]));
// number of markers (total of APP2 used)
//$nom = max(1, ord($data['raw'][($pos + 13)]));
// get sequence segment
$icc[$msn - 1] = substr($data['raw'], $pos + 14, $length);
// move forward to next sequence
$offset = $pos + 14 + $length;
}
// order and compact ICC segments
if (count($icc) > 0) {
ksort($icc);
$icc = implode('', $icc);
if (substr($icc, 36, 4) == 'acsp') {
// valid ICC profile
$data['icc'] = $icc;
}
}
return $data;
}
/**
* Get maxp data
*/
protected function getMaxpData()
{
$this->offset = $this->fdt['table']['maxp']['offset'];
$this->offset += 4;
// skip Table version number
// get the the number of glyphs in the font.
$this->fdt['numGlyphs'] = $this->fbyte->getUShort($this->offset);
}
/**
* Add composite glyphs
*
* @param array $new_sga
* @param int $key
*
* @return array
*/
protected function findCompositeGlyphs($new_sga, $key)
{
if (isset($this->fdt['indexToLoc'][$key])) {
$this->offset = $this->fdt['table']['glyf']['offset'] + $this->fdt['indexToLoc'][$key];
$numberOfContours = $this->fbyte->getShort($this->offset);
$this->offset += 2;
if ($numberOfContours < 0) {
// composite glyph
$this->offset += 8;
// skip xMin, yMin, xMax, yMax
do {
$flags = $this->fbyte->getUShort($this->offset);
$this->offset += 2;
$glyphIndex = $this->fbyte->getUShort($this->offset);
$this->offset += 2;
if (!isset($this->subglyphs[$glyphIndex])) {
// add missing glyphs
$new_sga[$glyphIndex] = true;
}
// skip some bytes by case
if ($flags & 1) {
$this->offset += 4;
} else {
$this->offset += 2;
}
if ($flags & 8) {
$this->offset += 2;
} elseif ($flags & 64) {
$this->offset += 4;
} elseif ($flags & 128) {
$this->offset += 8;
}
} while ($flags & 32);
}
}
return $new_sga;
}
