public function expandBlocks($blocks)
{
$decoded = array();
foreach ($blocks as $blockName => $block) {
$bytes = new GifByteStream($block);
if (false !== strpos($blockName, 'header')) {
$part = $bytes->bite(3);
$decoded['signature'] = $this->_hexToAscii($part);
$part = $bytes->bite(3);
$decoded['version'] = $this->_hexToAscii($part);
} else {
if (false !== strpos($blockName, 'logicalScreenDescriptor')) {
$part = $bytes->bite(2);
$decoded['canvasWidth'] = hexdec($this->_switchEndian($part));
$part = $bytes->bite(2);
$decoded['canvasHeight'] = hexdec($this->_switchEndian($part));
$part = $bytes->bite(1);
$bin = $this->_fixSize($this->_hexToBin($part), 8);
// Make sure len is correct
$decoded['globalColorTableFlag'] = bindec(substr($bin, 0, 1));
$decoded['colorResolution'] = bindec(substr($bin, 1, 3));
$decoded['sortFlag'] = bindec(substr($bin, 4, 1));
$decoded['sizeOfGlobalColorTable'] = bindec(substr($bin, 5, 3));
$part = $bytes->bite(1);
$decoded['backgroundColorIndex'] = hexdec($part);
$part = $bytes->bite(1);
$decoded['pixelAspectRatio'] = hexdec($part);
} else {
if (false !== strpos($blockName, 'globalColorTable')) {
$decoded['globalColorTable'] = $block;
} else {
if (false !== strpos($blockName, 'applicationExtension')) {
$index = explode('-', $blockName, 2);
$index = $index[1];
$bytes->next(2);
// Skip ext intro and label: 21 ff
$appNameSize = $bytes->bite(1);
// 0x0b or 11 according to spec but we check anyways
$appNameSize = hexdec($appNameSize);
$appName = $this->_hexToAscii($bytes->bite($appNameSize));
$subBlocks = array();
while (!$bytes->isEnd()) {
// loop thru all app sub blocks
$nextSize = $bytes->bite(1);
if ($nextSize !== '00') {
$size = hexdec($nextSize);
$subBlocks[] = $bytes->bite($size);
}
}
if ($appName === 'NETSCAPE2.0') {
$decoded['applicationExtension'][$index]['appId'] = 'NETSCAPE';
$decoded['applicationExtension'][$index]['appCode'] = '2.0';
$decoded['applicationExtension'][$index]['subBlocks'] = $subBlocks;
$decoded['loopCount'] = hexdec($this->_switchEndian(substr($subBlocks[0], 2, 4)));
} else {
$decoded['applicationExtension'][$index]['appId'] = substr($appName, 0, 8);
$decoded['applicationExtension'][$index]['appCode'] = substr($appName, 8, 3);
$decoded['applicationExtension'][$index]['subBlocks'] = $subBlocks;
}
} else {
if (false !== strpos($blockName, 'graphicControlExtension')) {
$index = explode('-', $blockName, 2);
$index = $index[1];
$bytes->next(3);
// Skip ext intro, label, and block size which is always 4: 21 f9 04
$part = $bytes->bite(1);
// packed field
$bin = $this->_fixSize($this->_hexToBin($part), 8);
// Make sure len is correct
$decoded['frames'][$index]['disposalMethod'] = bindec(substr($bin, 3, 3));
$decoded['frames'][$index]['userInputFlag'] = bindec(substr($bin, 6, 1));
$decoded['frames'][$index]['transparentColorFlag'] = bindec(substr($bin, 7, 1));
$part = $bytes->bite(2);
$decoded['frames'][$index]['delayTime'] = hexdec($this->_switchEndian($part));
$part = $bytes->bite(1);
$decoded['frames'][$index]['transparentColorIndex'] = hexdec($part);
} else {
if (false !== strpos($blockName, 'imageDescriptor')) {
$index = explode('-', $blockName, 2);
$index = $index[1];
$bytes->next(1);
// skip separator: 2c
$part = $bytes->bite(2);
$decoded['frames'][$index]['imageLeft'] = hexdec($this->_switchEndian($part));
$part = $bytes->bite(2);
$decoded['frames'][$index]['imageTop'] = hexdec($this->_switchEndian($part));
$part = $bytes->bite(2);
$decoded['frames'][$index]['imageWidth'] = hexdec($this->_switchEndian($part));
$part = $bytes->bite(2);
$decoded['frames'][$index]['imageHeight'] = hexdec($this->_switchEndian($part));
$part = $bytes->bite(1);
// packed field
$bin = $this->_fixSize($this->_hexToBin($part), 8);
$decoded['frames'][$index]['localColorTableFlag'] = bindec(substr($bin, 0, 1));
$decoded['frames'][$index]['interlaceFlag'] = bindec(substr($bin, 1, 1));
$decoded['frames'][$index]['sortFlag'] = bindec(substr($bin, 2, 1));
$decoded['frames'][$index]['sizeOfLocalColorTable'] = bindec(substr($bin, 5, 3));
} else {
if (false !== strpos($blockName, 'localColorTable')) {
$index = explode('-', $blockName, 2);
$index = $index[1];
$decoded['frames'][$index]['localColorTable'] = $block;
} else {
if (false !== strpos($blockName, 'imageData')) {
$index = explode('-', $blockName, 2);
$index = $index[1];
$decoded['frames'][$index]['imageData'] = $block;
} else {
if ($blockName === 'trailer') {
$decoded['trailer'] = $block;
}
}
}
}
}
}
}
}
}
unset($bytes);
}
return $decoded;
}
