From cecb985bee3bdd252e1b8dc0bd500b37cd52be01 Mon Sep 17 00:00:00 2001
From: Pierre Schmitz <pierre@archlinux.de>
Date: Wed, 16 May 2007 20:58:53 +0000
Subject: Aktualisierung auf MediaWiki 1.10.0 Plugins angepasst und verbessert
 kleine Korrekturen am Design

---
 includes/media/DjVu.php | 206 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 206 insertions(+)
 create mode 100644 includes/media/DjVu.php

(limited to 'includes/media/DjVu.php')

diff --git a/includes/media/DjVu.php b/includes/media/DjVu.php
new file mode 100644
index 00000000..3c053a0c
--- /dev/null
+++ b/includes/media/DjVu.php
@@ -0,0 +1,206 @@
+<?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 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->getImagePath();
+		$page = $params['page'];
+		$pageCount = $this->pageCount( $image );
+		if ( $page > $this->pageCount( $image ) ) {
+			return new MediaTransformError( 'thumbnail_error', $width, $height, wfMsg( 'djvu_page_error' ) );
+		}
+		
+		if ( $flags & self::TRANSFORM_LATER ) {
+			return new ThumbnailImage( $dstUrl, $width, $height, $dstPath );
+		}
+
+		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( $dstUrl, $width, $height, $dstPath );
+		}
+	}
+
+	/**
+	 * 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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