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Posted to users@pdfbox.apache.org by Charles Harris <Ch...@pkware.com.INVALID> on 2024/08/22 17:36:21 UTC

NullPointerException on bad Unicode font mapping

Hello, in pdfbox 3.0.0-alpha3 I am encountering the following error:

java.lang.NullPointerException: Cannot read the array length because "this.glyphIdToCharacterCode" is null
  org.apache.fontbox.ttf.CmapSubtable.getCharCode(CmapSubtable.java:638)
  org.apache.fontbox.ttf.CmapSubtable.getCharCodes(CmapSubtable.java:655)
  org.apache.pdfbox.pdmodel.font.PDType0Font.toUnicode(PDType0Font.java:546)...

This is thrown by the following code :

while (currentPosition < bytes.size && currentCharacterBytes++ < maxEncodingBytes) {
    potentialCode = potentialCode.shl(8).or(bytes[currentPosition++].toInt().and(0xFF))
    val potentialRepresentation: String
    potentialRepresentation = font.toUnicode(potentialCode) ?: continue // Exception is thrown here
    unicodeRepresentation.append(potentialRepresentation)
    codes.add(potentialCode)
    currentCharacterBytes = 0
    potentialCode = 0
}

Unfortunately, the pdf that caused this is not available, this error was discovered in review of the logs. Attempts to recreate the exception by creating a pdf through pdfbox and manually using different glyphs/fonts/emoji combinations were unsuccessful. From the exception itself, it would seem that the glyphIdToCharacterCode array in CmapSubtable is not being initialized.

Re: NullPointerException on bad Unicode font mapping

Posted by Tilman Hausherr <TH...@t-online.de>.
Answered last time:
https://lists.apache.org/thread/yltqzhbl8oltgxltg94wo5msdmwmwsrd

Tilman

On 22.08.2024 19:36, Charles Harris wrote:
> Hello, in pdfbox 3.0.0-alpha3 I am encountering the following error:
>
> java.lang.NullPointerException: Cannot read the array length because "this.glyphIdToCharacterCode" is null
>    org.apache.fontbox.ttf.CmapSubtable.getCharCode(CmapSubtable.java:638)
>    org.apache.fontbox.ttf.CmapSubtable.getCharCodes(CmapSubtable.java:655)
>    org.apache.pdfbox.pdmodel.font.PDType0Font.toUnicode(PDType0Font.java:546)...
>
> This is thrown by the following code :
>
> while (currentPosition < bytes.size && currentCharacterBytes++ < maxEncodingBytes) {
>      potentialCode = potentialCode.shl(8).or(bytes[currentPosition++].toInt().and(0xFF))
>      val potentialRepresentation: String
>      potentialRepresentation = font.toUnicode(potentialCode) ?: continue // Exception is thrown here
>      unicodeRepresentation.append(potentialRepresentation)
>      codes.add(potentialCode)
>      currentCharacterBytes = 0
>      potentialCode = 0
> }
>
> Unfortunately, the pdf that caused this is not available, this error was discovered in review of the logs. Attempts to recreate the exception by creating a pdf through pdfbox and manually using different glyphs/fonts/emoji combinations were unsuccessful. From the exception itself, it would seem that the glyphIdToCharacterCode array in CmapSubtable is not being initialized.
>
>


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