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Avoid unnecessary allocations in StompDecoder#unescape #29443

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Avoid unnecessary allocations in StompDecoder#unescape #29443

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7 changes: 5 additions & 2 deletions spring-messaging/src/main/java/org/springframework/messaging/simp/stomp/StompDecoder.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2021 the original author or authors.
* Copyright 2002-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
Expand Down Expand Up @@ -264,9 +264,12 @@ private void readHeaders(ByteBuffer byteBuffer, StompHeaderAccessor headerAccess
* <a href="https://stomp.github.io/stomp-specification-1.2.html#Value_Encoding">"Value Encoding"</a>.
*/
private String unescape(String inString) {
int index = inString.indexOf('\\');
if (index == -1) {
return inString;
}
StringBuilder sb = new StringBuilder(inString.length());
int pos = 0; // position in the old string
int index = inString.indexOf('\\');

while (index >= 0) {
sb.append(inString, pos, index);
Expand Down