From 1e48ed448e02b642541f2b1960c27330471e8850 Mon Sep 17 00:00:00 2001
From: Baron Roberts <baron@cthing.com>
Date: Thu, 28 Mar 2024 17:18:33 -0700
Subject: [PATCH] No longer escape and write characters considered to be
 invalid according to the XML 1.0 spec.

---
 CHANGELOG.md                                          | 4 ++--
 src/main/java/org/cthing/xmlwriter/XmlWriter.java     | 6 +-----
 src/test/java/org/cthing/xmlwriter/XmlWriterTest.java | 8 ++++----
 3 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7143467..bf57452 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,8 +18,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 - Numeric character entities are now written in hexidecimal (e.g. `&#xA9;`) rather than decimal
-- Invalid XML characters are now written using the prefix `unicode-`  (e.g. `unicode-0xFFFE`) rather
-  than `ctrl-` and using hexidecimal  (e.g. `unicode-0xFFFE`) rather than decimal for the character code
+- Invalid XML characters are no longer written. In previous versions, they were written in decimal with the prefix
+  "ctrl-".
 - Changed JSR-305 dependency from `implementation` to `api`
 
 ## [2.0.1] - 2023-12-23
diff --git a/src/main/java/org/cthing/xmlwriter/XmlWriter.java b/src/main/java/org/cthing/xmlwriter/XmlWriter.java
index 6a433c9..a09a40d 100755
--- a/src/main/java/org/cthing/xmlwriter/XmlWriter.java
+++ b/src/main/java/org/cthing/xmlwriter/XmlWriter.java
@@ -2657,8 +2657,7 @@ void writeEscaped(final char[] carr, final int start, final int length) throws S
     /**
      * Writes the specified character to the output escaping the '&amp;', '&lt;', and '&gt;' characters using the
      * standard XML escape sequences. Control characters and characters outside the ASCII range are escaped using a
-     * numeric character reference. Invalid XML control characters are written as {code unicode-0xN} where {@code N}
-     * is the hexidecimal value of the invalid character.
+     * numeric character reference. Invalid XML characters are not written.
      *
      * @param c Character to write
      * @throws SAXException If there is an error writing the character. The SAXException wraps an IOException.
@@ -2680,9 +2679,6 @@ void writeEscaped(final int c) throws SAXException {
                     writeRaw("&#x");
                     writeRaw(Integer.toHexString(c).toUpperCase());
                     writeRaw(';');
-                } else {
-                    writeRaw("unicode-0x");
-                    writeRaw(Integer.toHexString(c).toUpperCase());
                 }
             }
         }
diff --git a/src/test/java/org/cthing/xmlwriter/XmlWriterTest.java b/src/test/java/org/cthing/xmlwriter/XmlWriterTest.java
index e2ac10f..b958c8b 100755
--- a/src/test/java/org/cthing/xmlwriter/XmlWriterTest.java
+++ b/src/test/java/org/cthing/xmlwriter/XmlWriterTest.java
@@ -114,7 +114,7 @@ void testNeedsEscaping(final String str, final boolean needsEscaping) {
     @DisplayName("Write an array with escaping")
     void testWriteEscapedArray() throws Exception {
         final String testStringIn = "<Hello &<>\" World\u00A9\u001A\uFFFE\uD83D\uDE03\t\n";
-        final String testStringOut = "&lt;Hello &amp;&lt;&gt;\" World&#xA9;unicode-0x1Aunicode-0xFFFE&#x1F603;\t\n";
+        final String testStringOut = "&lt;Hello &amp;&lt;&gt;\" World&#xA9;&#x1F603;\t\n";
 
         this.xmlWriter.writeEscaped(testStringIn.toCharArray(), 0, testStringIn.length());
 
@@ -133,9 +133,9 @@ public static Stream<Arguments> writeEscapedProvider() {
                 arguments('\n', "\n"),
                 arguments('\t', "\t"),
                 arguments('\r', "\r"),
-                arguments(0x0, "unicode-0x0"),
-                arguments(0x1F, "unicode-0x1F"),
-                arguments(0xFFFF, "unicode-0xFFFF"),
+                arguments(0x0, ""),
+                arguments(0x1F, ""),
+                arguments(0xFFFF, ""),
                 arguments(0x7F, "&#x7F;"),
                 arguments(0xD7FF, "&#xD7FF;"),
                 arguments(0xE000, "&#xE000;"),