From 8ddb1b6dbd35d98dd4933a9802a232e310a413bb Mon Sep 17 00:00:00 2001
From: Yegor Kozlov <yegor@apache.org>
Date: Wed, 28 Jul 2010 05:48:27 +0000
Subject: [PATCH] Support for escaped unicode characters in Shared String
 Table, see bug #49653

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@979952 13f79535-47bb-0310-9956-ffa450edef68
---
 src/documentation/content/xdocs/status.xml    |  7 +--
 .../xssf/usermodel/XSSFRichTextString.java    | 43 ++++++++++++++++++-
 .../usermodel/TestXSSFRichTextString.java     | 12 ++++++
 3 files changed, 57 insertions(+), 5 deletions(-)

diff --git a/src/documentation/content/xdocs/status.xml b/src/documentation/content/xdocs/status.xml
index 6ec1c7c1a3..4e21fa3a06 100644
--- a/src/documentation/content/xdocs/status.xml
+++ b/src/documentation/content/xdocs/status.xml
@@ -34,10 +34,11 @@
 
     <changes>
         <release version="3.7-beta2" date="2010-??-??">
-           <action dev="POI-DEVELOPERS" type="add">49579 - prevent ArrayIndexOutOfBoundException in UnknowEscherRecord</action>
-           <action dev="POI-DEVELOPERS" type="add">49593 - preserve leading and trailing white spaces in  XWPFRun</action>
+           <action dev="POI-DEVELOPERS" type="fix">49653 - Support for escaped unicode characters in Shared String Table</action>
+           <action dev="POI-DEVELOPERS" type="fix">49579 - prevent ArrayIndexOutOfBoundException in UnknowEscherRecord</action>
+           <action dev="POI-DEVELOPERS" type="fix">49593 - preserve leading and trailing white spaces in  XWPFRun</action>
            <action dev="POI-DEVELOPERS" type="add">49455 - Insert the content of fldSimple fields into the XWPFWordTextExtractor output</action>
-           <action dev="POI-DEVELOPERS" type="add">49640 - Fixed parsing formulas containing defined names beginning with an underscore</action>
+           <action dev="POI-DEVELOPERS" type="fix">49640 - Fixed parsing formulas containing defined names beginning with an underscore</action>
            <action dev="POI-DEVELOPERS" type="add">49538 - Added implementation for POISSON()</action>
            <action dev="POI-DEVELOPERS" type="add">49524 - Support for setting cell text to be vertically rotated, via style.setRotation(0xff)</action>
            <action dev="POI-DEVELOPERS" type="fix">49609 - Case insensitive matching of OOXML part names</action>
diff --git a/src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFRichTextString.java b/src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFRichTextString.java
index 0afd1a5971..736a15b3ad 100644
--- a/src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFRichTextString.java
+++ b/src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFRichTextString.java
@@ -18,6 +18,8 @@
 package org.apache.poi.xssf.usermodel;
 
 import java.util.ArrayList;
+import java.util.regex.Pattern;
+import java.util.regex.Matcher;
 
 import javax.xml.namespace.QName;
 
@@ -75,6 +77,8 @@ import org.openxmlformats.schemas.spreadsheetml.x2006.main.STXstring;
  * @author Yegor Kozlov
  */
 public class XSSFRichTextString implements RichTextString {
+    private static final Pattern utfPtrn = Pattern.compile("_x([0-9A-F]{4})_");
+
     private CTRst st;
     private StylesTable styles;
 
@@ -337,13 +341,13 @@ public class XSSFRichTextString implements RichTextString {
      */
     public String getString() {
         if(st.sizeOfRArray() == 0) {
-            return st.getT();
+            return utfDecode(st.getT());
         }
         StringBuffer buf = new StringBuffer();
         for(CTRElt r : st.getRList()){
             buf.append(r.getT());
         }
-        return buf.toString();
+        return utfDecode(buf.toString());
     }
 
     /**
@@ -490,4 +494,39 @@ public class XSSFRichTextString implements RichTextString {
             c.dispose();
         }
     }
+
+    /**
+     * For all characters which cannot be represented in XML as defined by the XML 1.0 specification,
+     * the characters are escaped using the Unicode numerical character representation escape character
+     * format _xHHHH_, where H represents a hexadecimal character in the character's value.
+     * <p>
+     * Example: The Unicode character 0D is invalid in an XML 1.0 document,
+     * so it shall be escaped as <code>_x000D_</code>.
+     * </p>
+     * See section 3.18.9 in the OOXML spec.
+     *
+     * @param   value the string to decode
+     * @return  the decoded string
+     */
+    static String utfDecode(String value){
+        if(value == null) return null;
+        
+        StringBuffer buf = new StringBuffer();
+        Matcher m = utfPtrn.matcher(value);
+        int idx = 0;
+        while(m.find()) {
+            int pos = m.start();
+            if( pos > idx) {
+                buf.append(value.substring(idx, pos));
+            }
+
+            String code = m.group(1);
+            int icode = Integer.decode("0x" + code);
+            buf.append((char)icode);
+
+            idx = m.end();
+        }
+        buf.append(value.substring(idx));
+        return buf.toString();
+    }
 }
diff --git a/src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestXSSFRichTextString.java b/src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestXSSFRichTextString.java
index e983079599..5251e06bb2 100644
--- a/src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestXSSFRichTextString.java
+++ b/src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestXSSFRichTextString.java
@@ -130,4 +130,16 @@ public final class TestXSSFRichTextString extends TestCase {
         assertEquals("<xml-fragment xml:space=\"preserve\">  Apache</xml-fragment>", xs.xmlText());
 
     }
+
+    /**
+     * test that unicode representation_ xHHHH_ is properly processed
+     */
+    public void testUtfDecode() {
+        CTRst st = CTRst.Factory.newInstance();
+        st.setT("abc_x000D_2ef_x000D_");
+        XSSFRichTextString rt = new XSSFRichTextString(st);
+        //_x000D_ is converted into carriage return
+        assertEquals("abc\r2ef\r", rt.getString());
+        
+    }
 }
-- 
2.39.5