Hello
I originally wanted to submit a defect to the PdfBox issue tracker but was
redirected to this list, so here we go…
We experienced an OutOfMemoryError when calling
PDAcroForm.getDefaultResources().getFont(COSName); with COSName{Helv}
at this location:
main
at java.lang.OutOfMemoryError.<init>()V (OutOfMemoryError.java:48)
at java.util.Arrays.copyOf([BI)[B (Arrays.java:3537)
at java.io.ByteArrayOutputStream.ensureCapacity(I)V
(ByteArrayOutputStream.java:100)
at java.io.ByteArrayOutputStream.write([BII)V (ByteArrayOutputStream.java:130)
at
org.apache.pdfbox.io.IOUtils.copy(Ljava/io/InputStream;Ljava/io/OutputStream;)J
(IOUtils.java:70)
at org.apache.pdfbox.io.IOUtils.toByteArray(Ljava/io/InputStream;)[B
(IOUtils.java:52)
at
org.apache.pdfbox.pdmodel.font.FileSystemFontProvider.addTrueTypeFontImpl(Lorg/apache/fontbox/ttf/TrueTypeFont;Ljava/io/File;)V
(FileSystemFontProvider.java:773)
at
org.apache.pdfbox.pdmodel.font.FileSystemFontProvider.access$1400(Lorg/apache/pdfbox/pdmodel/font/FileSystemFontProvider;Lorg/apache/fontbox/ttf/TrueTypeFont;Ljava/io/File;)V
(FileSystemFontProvider.java:60)
at
org.apache.pdfbox.pdmodel.font.FileSystemFontProvider$1.process(Lorg/apache/fontbox/ttf/TrueTypeFont;)V
(FileSystemFontProvider.java:686)
at
org.apache.fontbox.ttf.TrueTypeCollection.processAllFonts(Lorg/apache/fontbox/ttf/TrueTypeCollection$TrueTypeFontProcessor;)V
(TrueTypeCollection.java:106)
at
org.apache.pdfbox.pdmodel.font.FileSystemFontProvider.addTrueTypeCollection(Ljava/io/File;)V
(FileSystemFontProvider.java:681)
at
org.apache.pdfbox.pdmodel.font.FileSystemFontProvider.scanFonts(Ljava/util/List;)V
(FileSystemFontProvider.java:398)
at
org.apache.pdfbox.pdmodel.font.FileSystemFontProvider.<init>(Lorg/apache/pdfbox/pdmodel/font/FontCache;)V
(FileSystemFontProvider.java:372)
at
org.apache.pdfbox.pdmodel.font.FontMapperImpl$DefaultFontProvider.<clinit>()V
(FontMapperImpl.java:141)
at
org.apache.pdfbox.pdmodel.font.FontMapperImpl.getProvider()Lorg/apache/pdfbox/pdmodel/font/FontProvider;
(FontMapperImpl.java:160)
at
org.apache.pdfbox.pdmodel.font.FontMapperImpl.findFont(Lorg/apache/pdfbox/pdmodel/font/FontFormat;Ljava/lang/String;)Lorg/apache/fontbox/FontBoxFont;
(FontMapperImpl.java:430)
at
org.apache.pdfbox.pdmodel.font.FontMapperImpl.findFontBoxFont(Ljava/lang/String;)Lorg/apache/fontbox/FontBoxFont;
(FontMapperImpl.java:393)
at
org.apache.pdfbox.pdmodel.font.FontMapperImpl.getFontBoxFont(Ljava/lang/String;Lorg/apache/pdfbox/pdmodel/font/PDFontDescriptor;)Lorg/apache/pdfbox/pdmodel/font/FontMapping;
(FontMapperImpl.java:367)
at de. <...>
.getFontBoxFont(Ljava/lang/String;Lorg/apache/pdfbox/pdmodel/font/PDFontDescriptor;)Lorg/apache/pdfbox/pdmodel/font/FontMapping;
(PdfFontManager.java:152)
at org.apache.pdfbox.pdmodel.font.PDType1Font.<init>(Ljava/lang/String;)V
(PDType1Font.java:146)
at org.apache.pdfbox.pdmodel.font.PDType1Font.<clinit>()V
(PDType1Font.java:79)
at
org.apache.pdfbox.pdmodel.font.PDFontFactory.createFont(Lorg/apache/pdfbox/cos/COSDictionary;Lorg/apache/pdfbox/pdmodel/ResourceCache;)Lorg/apache/pdfbox/pdmodel/font/PDFont;
(PDFontFactory.java:76)
at
org.apache.pdfbox.pdmodel.PDResources.getFont(Lorg/apache/pdfbox/cos/COSName;)Lorg/apache/pdfbox/pdmodel/font/PDFont;
(PDResources.java:171)
at de. <...> .initializeFonts()V (PdfFontHelper.java:66)
The reason seemed to be that PdfBox initializes a FontCache when getFont is
called and this scans _all_ fonts on the system. This also loads some large
system fonts (AppleColorEmoji is 189,9MB). Each font gets copied into a single
large byte array at the location below and this causes an OutOfMemoryError at
this point in the code.
org.apache.pdfbox.pdmodel.font.FileSystemFontProvider#addTrueTypeFontImpl:773
> InputStream is = ttf.getOriginalData();
> byte[] ba = IOUtils.toByteArray(is);
> is.close();
> String hash = computeHash(ba);
I think this would be easily fixed by using a DigestInputStream instead of a
byte array to compute hashes at this location. I have tested this locally and
it seemed to work. I could send a patch file or submit a pull request, if it
helps.
Best regards
Kim Hagedorn
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