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<?php
/**
* @addtogroup Media
*/
class DjVuHandler extends ImageHandler {
function isEnabled() {
global $wgDjvuRenderer, $wgDjvuDump, $wgDjvuToXML;
if ( !$wgDjvuRenderer || ( !$wgDjvuDump && !$wgDjvuToXML ) ) {
wfDebug( "DjVu is disabled, please set \$wgDjvuRenderer and \$wgDjvuDump\n" );
return false;
} else {
return true;
}
}
function mustRender() { return true; }
function isMultiPage() { return true; }
function getParamMap() {
return array(
'img_width' => 'width',
'img_page' => 'page',
);
}
function validateParam( $name, $value ) {
if ( in_array( $name, array( 'width', 'height', 'page' ) ) ) {
if ( $value <= 0 ) {
return false;
} else {
return true;
}
} else {
return false;
}
}
function makeParamString( $params ) {
$page = isset( $params['page'] ) ? $params['page'] : 1;
if ( !isset( $params['width'] ) ) {
return false;
}
return "page{$page}-{$params['width']}px";
}
function parseParamString( $str ) {
$m = false;
if ( preg_match( '/^page(\d+)-(\d+)px$/', $str, $m ) ) {
return array( 'width' => $m[2], 'page' => $m[1] );
} else {
return false;
}
}
function getScriptParams( $params ) {
return array(
'width' => $params['width'],
'page' => $params['page'],
);
}
function doTransform( $image, $dstPath, $dstUrl, $params, $flags = 0 ) {
global $wgDjvuRenderer, $wgDjvuPostProcessor;
// Fetch XML and check it, to give a more informative error message than the one which
// normaliseParams will inevitably give.
$xml = $image->getMetadata();
if ( !$xml ) {
return new MediaTransformError( 'thumbnail_error', @$params['width'], @$params['height'],
wfMsg( 'djvu_no_xml' ) );
}
if ( !$this->normaliseParams( $image, $params ) ) {
return new TransformParameterError( $params );
}
$width = $params['width'];
$height = $params['height'];
$srcPath = $image->getPath();
$page = $params['page'];
if ( $page > $this->pageCount( $image ) ) {
return new MediaTransformError( 'thumbnail_error', $width, $height, wfMsg( 'djvu_page_error' ) );
}
if ( $flags & self::TRANSFORM_LATER ) {
return new ThumbnailImage( $image, $dstUrl, $width, $height, $dstPath, $page );
}
if ( !wfMkdirParents( dirname( $dstPath ) ) ) {
return new MediaTransformError( 'thumbnail_error', $width, $height, wfMsg( 'thumbnail_dest_directory' ) );
}
# Use a subshell (brackets) to aggregate stderr from both pipeline commands
# before redirecting it to the overall stdout. This works in both Linux and Windows XP.
$cmd = '(' . wfEscapeShellArg( $wgDjvuRenderer ) . " -format=ppm -page={$page} -size={$width}x{$height} " .
wfEscapeShellArg( $srcPath );
if ( $wgDjvuPostProcessor ) {
$cmd .= " | {$wgDjvuPostProcessor}";
}
$cmd .= ' > ' . wfEscapeShellArg($dstPath) . ') 2>&1';
wfProfileIn( 'ddjvu' );
wfDebug( __METHOD__.": $cmd\n" );
$err = wfShellExec( $cmd, $retval );
wfProfileOut( 'ddjvu' );
$removed = $this->removeBadFile( $dstPath, $retval );
if ( $retval != 0 || $removed ) {
wfDebugLog( 'thumbnail',
sprintf( 'thumbnail failed on %s: error %d "%s" from "%s"',
wfHostname(), $retval, trim($err), $cmd ) );
return new MediaTransformError( 'thumbnail_error', $width, $height, $err );
} else {
return new ThumbnailImage( $image, $dstUrl, $width, $height, $dstPath, $page );
}
}
/**
* Cache an instance of DjVuImage in an Image object, return that instance
*/
function getDjVuImage( $image, $path ) {
if ( !$image ) {
$deja = new DjVuImage( $path );
} elseif ( !isset( $image->dejaImage ) ) {
$deja = $image->dejaImage = new DjVuImage( $path );
} else {
$deja = $image->dejaImage;
}
return $deja;
}
/**
* Cache a document tree for the DjVu XML metadata
*/
function getMetaTree( $image ) {
if ( isset( $image->dejaMetaTree ) ) {
return $image->dejaMetaTree;
}
$metadata = $image->getMetadata();
if ( !$this->isMetadataValid( $image, $metadata ) ) {
wfDebug( "DjVu XML metadata is invalid or missing, should have been fixed in upgradeRow\n" );
return false;
}
wfProfileIn( __METHOD__ );
wfSuppressWarnings();
try {
$image->dejaMetaTree = new SimpleXMLElement( $metadata );
} catch( Exception $e ) {
wfDebug( "Bogus multipage XML metadata on '$image->name'\n" );
// Set to false rather than null to avoid further attempts
$image->dejaMetaTree = false;
}
wfRestoreWarnings();
wfProfileOut( __METHOD__ );
return $image->dejaMetaTree;
}
function getImageSize( $image, $path ) {
return $this->getDjVuImage( $image, $path )->getImageSize();
}
function getThumbType( $ext, $mime ) {
global $wgDjvuOutputExtension;
static $mime;
if ( !isset( $mime ) ) {
$magic = MimeMagic::singleton();
$mime = $magic->guessTypesForExtension( $wgDjvuOutputExtension );
}
return array( $wgDjvuOutputExtension, $mime );
}
function getMetadata( $image, $path ) {
wfDebug( "Getting DjVu metadata for $path\n" );
return $this->getDjVuImage( $image, $path )->retrieveMetaData();
}
function getMetadataType( $image ) {
return 'djvuxml';
}
function isMetadataValid( $image, $metadata ) {
return !empty( $metadata ) && $metadata != serialize(array());
}
function pageCount( $image ) {
$tree = $this->getMetaTree( $image );
if ( !$tree ) {
return false;
}
return count( $tree->xpath( '//OBJECT' ) );
}
function getPageDimensions( $image, $page ) {
$tree = $this->getMetaTree( $image );
if ( !$tree ) {
return false;
}
$o = $tree->BODY[0]->OBJECT[$page-1];
if ( $o ) {
return array(
'width' => intval( $o['width'] ),
'height' => intval( $o['height'] )
);
} else {
return false;
}
}
}
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