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https://issues.apache.org/jira/browse/FOP-2920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17159621#comment-17159621
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Kelly H Wilkerson commented on FOP-2920:
----------------------------------------
Suggested fix for this issue attached as [^2920.patch]
> [PATCH] Surrogate pair edge-case causes
> java.lang.ArrayIndexOutOfBoundsException
> --------------------------------------------------------------------------------
>
> Key: FOP-2920
> URL: https://issues.apache.org/jira/browse/FOP-2920
> Project: FOP
> Issue Type: Bug
> Components: renderer/pdf
> Affects Versions: 2.5
> Environment: macOS Mojave
> java version "1.8.0_192-ea"
> Java(TM) SE Runtime Environment (build 1.8.0_192-ea-b04)
> Java HotSpot(TM) 64-Bit Server VM (build 25.192-b04, mixed mode)
> Reporter: Kelly H Wilkerson
> Priority: Minor
> Attachments: 2920.patch, TwitterColorEmoji-SVGinOT.ttf, diff.txt,
> fail.xml, twe_template.fo, twe_userconfig.xml
>
>
> fop-core/src/main/java/org/apache/fop/pdf/PDFToUnicodeCMap.java
> writeBFCharEntries runs through the codepoint entries in sections of 100 at a
> time. It looks like there's an edge case here where the last entry in the
> section is a surrogate pair.
>
> Here's my steps to reproduce from the latest trunk:
> {{java -cp
> fop/target/fop-2.5.0-SNAPSHOT.jar:fop/lib/commons-logging-1.0.4.jar:fop/lib/commons-io-1.3.1.jar:fop/lib/xmlgraphics-commons-svn-trunk.jar
> org.apache.fop.fonts.apps.TTFReader TwitterColorEmoji-SVGinOT.ttf twe.xml}}
> {{java -cp
> fop/target/fop-2.5.0-SNAPSHOT.jar:fop/lib/commons-logging-1.0.4.jar:fop/lib/commons-io-1.3.1.jar:fop/lib/xmlgraphics-commons-svn-trunk.jar:fop/lib/batik-all-1.11.0-SNAPSHOT.jar
> org.apache.fop.cli.Main -c twe_userconfig.xml -xsl twe_template.fo -xml
> fail.xml -pdf fail.pdf}}
>
> Here's the temporary way I resolved it for my own build:
>
> index ee773dcec..37c21803e 100644
> --- a/fop-core/src/main/java/org/apache/fop/pdf/PDFToUnicodeCMap.java
> +++ b/fop-core/src/main/java/org/apache/fop/pdf/PDFToUnicodeCMap.java
> @@ -128,6 +128,18 @@ public class PDFToUnicodeCMap extends PDFCMap {
> while (partOfRange(charArray, charIndex)) {
> charIndex++;
> }
> /*
> * If this entry is going to overflow the entriesThisSection
> * array, then don't use it. This happens if there are
> * non-pair entries in the table mixed with pair entries.
> */
> if (Character.codePointAt(charArray, charIndex) > 0xFFFF
> && i+1 >= entriesThisSection) {
> entriesThisSection--;
> break;
> }
> writer.write("<" + padCharIndex(charIndex) + "> ");
> if (Character.codePointAt(charArray, charIndex) > 0xFFFF) {
--
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