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<?php |
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namespace Elphin\IcoFileLoader; |
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/** |
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* IcoParser provides the means to read an ico file and produce an Icon object |
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* containing an IconImage objects for each image in the ico file |
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* |
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* @package Elphin\IcoFileLoader |
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*/ |
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class IcoParser implements ParserInterface |
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{ |
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/** |
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* @inheritdoc |
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*/ |
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public function isSupportedBinaryString($data) |
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{ |
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$supported = !is_null($this->parseIconDir($data)); |
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$supported = $supported || $this->isPNG($data); |
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return $supported; |
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} |
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/** |
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* Reads the ICONDIR header and verifies it looks sane |
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* @param string $data |
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* @return array|null - null is returned if the file doesn't look like an .ico file |
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*/ |
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private function parseIconDir($data) |
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{ |
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$icondir = unpack('SReserved/SType/SCount', $data); |
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if ($icondir['Reserved'] == 0 && $icondir['Type'] == 1) { |
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return $icondir; |
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} |
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return null; |
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} |
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/** |
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* @param $data |
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* @return bool true if first four bytes look like a PNG |
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*/ |
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private function isPNG($data) |
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{ |
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$signature = unpack('LFourCC', $data); |
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return ($signature['FourCC'] == 0x474e5089); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function parse($data) |
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{ |
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if ($this->isPNG($data)) { |
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return $this->parsePNGAsIco($data); |
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} |
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return $this->parseICO($data); |
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} |
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private function parseICO($data) |
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{ |
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$icondir = $this->parseIconDir($data); |
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if (!$icondir) { |
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throw new \InvalidArgumentException('Invalid ICO file format'); |
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} |
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//nibble the header off our data |
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$data = substr($data, 6); |
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//parse the ICONDIRENTRY headers |
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$icon = new Icon(); |
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$data = $this->parseIconDirEntries($icon, $data, $icondir['Count']); |
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// Extract additional headers for each extracted ICONDIRENTRY |
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$iconCount = count($icon); |
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for ($i = 0; $i < $iconCount; ++$i) { |
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if ($this->isPNG(substr($data, $icon[$i]->fileOffset, 4))) { |
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$this->parsePng($icon[$i], $data); |
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} else { |
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$this->parseBmp($icon[$i], $data); |
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} |
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} |
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return $icon; |
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} |
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private function parsePNGAsIco($data) |
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{ |
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$png = imagecreatefromstring($data); |
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$w = imagesx($png); |
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$h = imagesy($png); |
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$bits = imageistruecolor($png) ? 32 : 8; |
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imagedestroy($png); |
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//fake enough header data for IconImage to do its job |
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$icoDirEntry = [ |
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'width' => $w, |
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'height' => $h, |
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'bitCount' => $bits |
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]; |
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//create the iconimage and give it the PNG data |
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$image = new IconImage($icoDirEntry); |
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$image->setPngFile($data); |
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$icon = new Icon(); |
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$icon[] = $image; |
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return $icon; |
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} |
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/** |
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* Parse the sequence of ICONDIRENTRY structures |
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* @param Icon $icon |
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* @param string $data |
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* @param integer $count |
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* @return string |
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*/ |
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private function parseIconDirEntries(Icon $icon, $data, $count) |
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{ |
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for ($i = 0; $i < $count; ++$i) { |
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$icoDirEntry = unpack( |
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'Cwidth/Cheight/CcolorCount/Creserved/Splanes/SbitCount/LsizeInBytes/LfileOffset', |
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$data |
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); |
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$icoDirEntry['fileOffset'] -= ($count * 16) + 6; |
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if ($icoDirEntry['colorCount'] == 0) { |
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$icoDirEntry['colorCount'] = 256; |
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} |
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if ($icoDirEntry['width'] == 0) { |
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$icoDirEntry['width'] = 256; |
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} |
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if ($icoDirEntry['height'] == 0) { |
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$icoDirEntry['height'] = 256; |
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} |
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$entry = new IconImage($icoDirEntry); |
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$icon[] = $entry; |
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$data = substr($data, 16); |
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} |
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return $data; |
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} |
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/** |
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* Handle icon image which is PNG formatted |
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* @param IconImage $entry |
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* @param string $data |
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*/ |
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private function parsePng(IconImage $entry, $data) |
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{ |
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//a png icon contains a complete png image at the file offset |
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$png = substr($data, $entry->fileOffset, $entry->sizeInBytes); |
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$entry->setPngFile($png); |
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} |
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/** |
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* Handle icon image which is BMP formatted |
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* @param IconImage $entry |
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* @param string $data |
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*/ |
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private function parseBmp(IconImage $entry, $data) |
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{ |
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$bitmapInfoHeader = unpack( |
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'LSize/LWidth/LHeight/SPlanes/SBitCount/LCompression/LImageSize/' . |
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'LXpixelsPerM/LYpixelsPerM/LColorsUsed/LColorsImportant', |
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substr($data, $entry->fileOffset, 40) |
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); |
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$entry->setBitmapInfoHeader($bitmapInfoHeader); |
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switch ($entry->bitCount) { |
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case 32: |
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case 24: |
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$this->parseTrueColorImageData($entry, $data); |
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break; |
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case 8: |
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case 4: |
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case 1: |
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$this->parsePaletteImageData($entry, $data); |
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break; |
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} |
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} |
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/** |
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* Parse an image which doesn't use a palette |
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* @param IconImage $entry |
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* @param string $data |
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*/ |
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private function parseTrueColorImageData(IconImage $entry, $data) |
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{ |
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$length = $entry->bmpHeaderWidth * $entry->bmpHeaderHeight * ($entry->bitCount / 8); |
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$bmpData = substr($data, $entry->fileOffset + $entry->bmpHeaderSize, $length); |
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$entry->setBitmapData($bmpData); |
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} |
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/** |
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* Parse an image which uses a limited palette of colours |
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* @param IconImage $entry |
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* @param string $data |
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*/ |
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private function parsePaletteImageData(IconImage $entry, $data) |
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{ |
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$pal = substr($data, $entry->fileOffset + $entry->bmpHeaderSize, $entry->colorCount * 4); |
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$idx = 0; |
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for ($j = 0; $j < $entry->colorCount; ++$j) { |
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$entry->addToBmpPalette(ord($pal[$idx + 2]), ord($pal[$idx + 1]), ord($pal[$idx]), ord($pal[$idx + 3])); |
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$idx += 4; |
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} |
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$length = $entry->bmpHeaderWidth * $entry->bmpHeaderHeight * (1 + $entry->bitCount) / $entry->bitCount; |
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$bmpData = substr($data, $entry->fileOffset + $entry->bmpHeaderSize + $entry->colorCount * 4, $length); |
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$entry->setBitmapData($bmpData); |
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} |
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} |
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