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-rw-r--r--includes/media/DjVuImage.php69
1 files changed, 39 insertions, 30 deletions
diff --git a/includes/media/DjVuImage.php b/includes/media/DjVuImage.php
index 6aef562b..54efe7a8 100644
--- a/includes/media/DjVuImage.php
+++ b/includes/media/DjVuImage.php
@@ -34,11 +34,21 @@
* @ingroup Media
*/
class DjVuImage {
+ /**
+ * Constructor
+ *
+ * @param string $filename The DjVu file name.
+ */
function __construct( $filename ) {
$this->mFilename = $filename;
}
/**
+ * @const DJVUTXT_MEMORY_LIMIT Memory limit for the DjVu description software
+ */
+ const DJVUTXT_MEMORY_LIMIT = 300000;
+
+ /**
* Check if the given file is indeed a valid DjVu image file
* @return bool
*/
@@ -47,7 +57,6 @@ class DjVuImage {
return $info !== false;
}
-
/**
* Return data in the style of getimagesize()
* @return array or false on failure
@@ -55,8 +64,8 @@ class DjVuImage {
public function getImageSize() {
$data = $this->getInfo();
- if( $data !== false ) {
- $width = $data['width'];
+ if ( $data !== false ) {
+ $width = $data['width'];
$height = $data['height'];
return array( $width, $height, 'DjVu',
@@ -84,20 +93,20 @@ class DjVuImage {
$start = ftell( $file );
$secondary = fread( $file, 4 );
echo str_repeat( ' ', $indent * 4 ) . "($secondary)\n";
- while( ftell( $file ) - $start < $length ) {
+ while ( ftell( $file ) - $start < $length ) {
$chunkHeader = fread( $file, 8 );
- if( $chunkHeader == '' ) {
+ if ( $chunkHeader == '' ) {
break;
}
// @todo FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
extract( unpack( 'a4chunk/NchunkLength', $chunkHeader ) );
echo str_repeat( ' ', $indent * 4 ) . "$chunk $chunkLength\n";
- if( $chunk == 'FORM' ) {
+ if ( $chunk == 'FORM' ) {
$this->dumpForm( $file, $chunkLength, $indent + 1 );
} else {
fseek( $file, $chunkLength, SEEK_CUR );
- if( $chunkLength & 1 == 1 ) {
+ if ( $chunkLength & 1 == 1 ) {
// Padding byte between chunks
fseek( $file, 1, SEEK_CUR );
}
@@ -109,7 +118,7 @@ class DjVuImage {
wfSuppressWarnings();
$file = fopen( $this->mFilename, 'rb' );
wfRestoreWarnings();
- if( $file === false ) {
+ if ( $file === false ) {
wfDebug( __METHOD__ . ": missing or failed file read\n" );
return false;
}
@@ -117,21 +126,21 @@ class DjVuImage {
$header = fread( $file, 16 );
$info = false;
- if( strlen( $header ) < 16 ) {
+ if ( strlen( $header ) < 16 ) {
wfDebug( __METHOD__ . ": too short file header\n" );
} else {
// @todo FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
extract( unpack( 'a4magic/a4form/NformLength/a4subtype', $header ) );
- if( $magic != 'AT&T' ) {
+ if ( $magic != 'AT&T' ) {
wfDebug( __METHOD__ . ": not a DjVu file\n" );
- } elseif( $subtype == 'DJVU' ) {
+ } elseif ( $subtype == 'DJVU' ) {
// Single-page document
$info = $this->getPageInfo( $file, $formLength );
- } elseif( $subtype == 'DJVM' ) {
+ } elseif ( $subtype == 'DJVM' ) {
// Multi-page document
$info = $this->getMultiPageInfo( $file, $formLength );
- } else {
+ } else {
wfDebug( __METHOD__ . ": unrecognized DJVU file type '$formType'\n" );
}
}
@@ -141,7 +150,7 @@ class DjVuImage {
private function readChunk( $file ) {
$header = fread( $file, 8 );
- if( strlen( $header ) < 8 ) {
+ if ( strlen( $header ) < 8 ) {
return array( false, 0 );
} else {
// @todo FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
@@ -153,7 +162,7 @@ class DjVuImage {
private function skipChunk( $file, $chunkLength ) {
fseek( $file, $chunkLength, SEEK_CUR );
- if( $chunkLength & 0x01 == 1 && !feof( $file ) ) {
+ if ( $chunkLength & 0x01 == 1 && !feof( $file ) ) {
// padding byte
fseek( $file, 1, SEEK_CUR );
}
@@ -165,13 +174,13 @@ class DjVuImage {
$start = ftell( $file );
do {
list( $chunk, $length ) = $this->readChunk( $file );
- if( !$chunk ) {
+ if ( !$chunk ) {
break;
}
- if( $chunk == 'FORM' ) {
+ if ( $chunk == 'FORM' ) {
$subtype = fread( $file, 4 );
- if( $subtype == 'DJVU' ) {
+ if ( $subtype == 'DJVU' ) {
wfDebug( __METHOD__ . ": found first subpage\n" );
return $this->getPageInfo( $file, $length );
}
@@ -180,7 +189,7 @@ class DjVuImage {
wfDebug( __METHOD__ . ": skipping '$chunk' chunk\n" );
$this->skipChunk( $file, $length );
}
- } while( $length != 0 && !feof( $file ) && ftell( $file ) - $start < $formLength );
+ } while ( $length != 0 && !feof( $file ) && ftell( $file ) - $start < $formLength );
wfDebug( __METHOD__ . ": multi-page DJVU file contained no pages\n" );
return false;
@@ -188,17 +197,17 @@ class DjVuImage {
private function getPageInfo( $file, $formLength ) {
list( $chunk, $length ) = $this->readChunk( $file );
- if( $chunk != 'INFO' ) {
+ if ( $chunk != 'INFO' ) {
wfDebug( __METHOD__ . ": expected INFO chunk, got '$chunk'\n" );
return false;
}
- if( $length < 9 ) {
+ if ( $length < 9 ) {
wfDebug( __METHOD__ . ": INFO should be 9 or 10 bytes, found $length\n" );
return false;
}
$data = fread( $file, $length );
- if( strlen( $data ) < $length ) {
+ if ( strlen( $data ) < $length ) {
wfDebug( __METHOD__ . ": INFO chunk cut off\n" );
return false;
}
@@ -228,7 +237,7 @@ class DjVuImage {
function retrieveMetaData() {
global $wgDjvuToXML, $wgDjvuDump, $wgDjvuTxt;
wfProfileIn( __METHOD__ );
-
+
if ( isset( $wgDjvuDump ) ) {
# djvudump is faster as of version 3.5
# http://sourceforge.net/tracker/index.php?func=detail&aid=1704049&group_id=32953&atid=406583
@@ -247,20 +256,20 @@ class DjVuImage {
$xml = null;
}
# Text layer
- if ( isset( $wgDjvuTxt ) ) {
+ if ( isset( $wgDjvuTxt ) ) {
wfProfileIn( 'djvutxt' );
- $cmd = wfEscapeShellArg( $wgDjvuTxt ) . ' --detail=page ' . wfEscapeShellArg( $this->mFilename ) ;
- wfDebug( __METHOD__.": $cmd\n" );
+ $cmd = wfEscapeShellArg( $wgDjvuTxt ) . ' --detail=page ' . wfEscapeShellArg( $this->mFilename );
+ wfDebug( __METHOD__ . ": $cmd\n" );
$retval = '';
- $txt = wfShellExec( $cmd, $retval );
+ $txt = wfShellExec( $cmd, $retval, array(), array( 'memory' => self::DJVUTXT_MEMORY_LIMIT ) );
wfProfileOut( 'djvutxt' );
- if( $retval == 0) {
+ if ( $retval == 0 ) {
# Strip some control characters
$txt = preg_replace( "/[\013\035\037]/", "", $txt );
$reg = <<<EOR
/\(page\s[\d-]*\s[\d-]*\s[\d-]*\s[\d-]*\s*"
((?> # Text to match is composed of atoms of either:
- \\\\. # - any escaped character
+ \\\\. # - any escaped character
| # - any character different from " and \
[^"\\\\]+
)*?)
@@ -271,7 +280,7 @@ EOR;
$txt = preg_replace_callback( $reg, array( $this, 'pageTextCallback' ), $txt );
$txt = "<DjVuTxt>\n<HEAD></HEAD>\n<BODY>\n" . $txt . "</BODY>\n</DjVuTxt>\n";
$xml = preg_replace( "/<DjVuXML>/", "<mw-djvu><DjVuXML>", $xml, 1 );
- $xml = $xml . $txt. '</mw-djvu>' ;
+ $xml = $xml . $txt . '</mw-djvu>';
}
}
wfProfileOut( __METHOD__ );
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2025-04-12 07:58:44 +0000