/**
* @param FileHandler $fh
*/
public function readDataSubBlocks($fh)
{
$this->dataSubBlocks = "";
while (!$fh->compareByte("")) {
$subBlockLength = $fh->readByteUint();
if ($subBlockLength == 0) {
return;
}
$this->dataSubBlocks .= chr($subBlockLength) . $fh->readData($subBlockLength);
}
}
/**
* @param FileHandler $fh
*/
public function decode($fh)
{
$fh->seekForward(1);
// skip block label.
$this->blockLength = $fh->readByteUint();
// 4
$packedFields = $fh->readByteUint();
$this->reserved = ($packedFields & 0x70) >> 5;
$this->disposalMethod = ($packedFields & 0x1c) >> 2;
$this->userInputFlag = ($packedFields & 0x2) > 0;
$this->transparentColorFlag = ($packedFields & 0x1) > 0;
$this->delayTime = $fh->readUint16();
$this->transparentColorIndex = $fh->readByteUint();
// Spool past the \x00 terminator byte. There *should* only be one.
while ($fh->compareByte("")) {
$fh->readByte();
}
// The GCE will always be followed by the Image Descriptor.
$this->imageDescriptor = new ImageDescriptor($fh);
$this->imageDescriptor->parentGCE = $this;
}
/**
* @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 $dstPath
*/
private static function readExtensionBlock($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 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();
}
}
