/**
* @param FileHandler $fh
* @param FileHandler $fhW
* @param float $ratio
* @param LogicalScreenDescriptor $lsd
*/
private static function readExtensionBlock($fh, $fhW, $ratio, $lsd)
{
$fh->seekForward(1);
$blockLabel = $fh->peekByte();
switch (ord($blockLabel)) {
case AbstractExtensionBlock::LABEL_APPLICATION:
$adb = new ApplicationExtension($fh);
$adb->encodeToFile($fhW);
break;
case AbstractExtensionBlock::LABEL_COMMENT:
$ceb = new CommentExtension($fh);
$ceb->encodeToFile($fhW);
break;
case AbstractExtensionBlock::LABEL_GRAPHICS_CONTROL:
$gce = new GraphicControlExtension($fh);
self::resizeGraphicControlExtensionBlock($gce, $ratio, $fhW, $lsd);
break;
case AbstractExtensionBlock::LABEL_PLAIN_TEXT:
$pte = new PlainTextExtension($fh);
$pte->encodeToFile($fhW);
break;
case AbstractExtensionBlock::CONTROL_TRAILER:
break;
default:
$fh->seekForward(1);
while (!$fh->compareByte("")) {
$fh->seekForward(1);
}
}
if ($fh->compareByte("")) {
$fh->readByte();
}
}
/**
* @param FileHandler $fh
* @param int $frameCount
* @param LogicalScreenDescriptor $lsd
* @param string $dstPath
*/
public static function dumpExtensionBlock($fh, &$frameCount, $lsd, $dstPath = null)
{
$fh->seekForward(1);
$blockLabel = $fh->peekByte();
switch (ord($blockLabel)) {
case AbstractExtensionBlock::LABEL_APPLICATION:
$adb = new ApplicationExtension($fh);
self::dumpApplicationExtensionBlock($adb);
break;
case AbstractExtensionBlock::LABEL_COMMENT:
$ceb = new CommentExtension($fh);
self::dumpCommentExtensionBlock($ceb);
break;
case AbstractExtensionBlock::LABEL_GRAPHICS_CONTROL:
$gce = new GraphicControlExtension($fh);
$frameCount++;
self::dumpGraphicControlExtensionBlock($gce, $frameCount, $lsd, $dstPath);
break;
case AbstractExtensionBlock::LABEL_PLAIN_TEXT:
$pte = new PlainTextExtension($fh);
self::dumpPlainTextExtensionBlock($pte);
break;
case AbstractExtensionBlock::CONTROL_TRAILER:
break;
default:
$fh->seekForward(1);
echo "Unknown Extension block found.......: 0x" . bin2hex($blockLabel) . " (" . ord($blockLabel) . ")\n";
while (!$fh->compareByte("")) {
$fh->seekForward(1);
}
}
if ($fh->compareByte("")) {
$fh->readByte();
}
}
/**
* @param FileHandler $fh
* @param int $frameCount
* @param LogicalScreenDescriptor $lsd
* @param string $dstPath
*/
private static function readExtensionBlock($fh, &$frameCount, $lsd, $dstPath)
{
$fh->seekForward(1);
$blockLabel = $fh->peekByte();
switch (ord($blockLabel)) {
case AbstractExtensionBlock::LABEL_APPLICATION:
new ApplicationExtension($fh);
break;
case AbstractExtensionBlock::LABEL_COMMENT:
new CommentExtension($fh);
break;
case AbstractExtensionBlock::LABEL_GRAPHICS_CONTROL:
$gce = new GraphicControlExtension($fh);
self::writeFrame($dstPath, $frameCount, $lsd, $gce);
break;
case AbstractExtensionBlock::LABEL_PLAIN_TEXT:
new PlainTextExtension($fh);
break;
case AbstractExtensionBlock::CONTROL_TRAILER:
break;
default:
$fh->seekForward(1);
while (!$fh->compareByte("")) {
$fh->seekForward(1);
}
}
if ($fh->compareByte("")) {
$fh->readByte();
}
}
/**
* @param FileHandler $fh
* @param GraphicControlExtension $gce
*
* @return ImageDescriptor|GraphicControlExtension
*/
public static function getFirstImageFrame($fh, $gce = null)
{
$nId = null;
while ($nId == null && !$fh->isEOF()) {
$blockLabel = $fh->peekByte();
if (ord($blockLabel) == AbstractExtensionBlock::CONTROL_IMAGE) {
$nId = new ImageDescriptor($fh);
if ($gce != null) {
$gce->transparentColorFlag = false;
$gce->transparentColorIndex = 0;
}
return $nId;
} else {
if (ord($blockLabel) == AbstractExtensionBlock::CONTROL_EXTENSION) {
$fh->seekForward(1);
$blockLabel = $fh->peekByte();
if (ord($blockLabel) == AbstractExtensionBlock::LABEL_GRAPHICS_CONTROL) {
$nGce = new GraphicControlExtension($fh);
if ($gce != null) {
$gce->transparentColorFlag = $nGce->transparentColorFlag;
$gce->transparentColorIndex = $nGce->transparentColorIndex;
}
return $nGce;
}
}
}
}
return null;
}