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Implement Utf8Helper.getAllowedCharsets() to lazy-load allowedCharsets, make Utf8Helper.allowedCharsets private

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This commit is contained in:
popugashkin
2023-07-14 15:05:12 +02:00
committed by Jindra Petřík
parent 8d2290d084
commit 5aa3d48a4e
2 changed files with 28 additions and 22 deletions
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32
libsrc/ffdec_lib/src/com/jpexs/helpers/utf8/Utf8Helper.java
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@@ -1,16 +1,16 @@
/*
* Copyright (C) 2010-2023 JPEXS, All rights reserved.
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3.0 of the License, or (at your option) any later version.
*
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library.
*/
@@ -39,16 +39,21 @@ public class Utf8Helper {
public static String charsetName = "UTF-8";
public static Charset charset = Charset.forName("UTF-8");
private static List<String> allowedVariableLengthCharsets = Arrays.asList(
"GB2312", "Shift_JIS", "UTF-8", "UTF-16", "UTF16-BE", "UTF-16-LE", "UTF-32", "UTF-32LE", "UTF-32BE");
/**
* Allowed charsets. They are limited to single byte charsets + allowedVariableLengthCharsets
*/
public static List<String> allowedCharsets = new ArrayList<>();
static {
private static List<String> allowedCharsets = null;
/**
* Get a list of allowed charsets. They are limited to single byte charsets + allowedVariableLengthCharsets
*/
public static List<String> getAllowedCharsets() {
if (allowedCharsets != null)
return allowedCharsets;
allowedCharsets = new ArrayList<>();
Map<String, Charset> charsets = Charset.availableCharsets();
for (String s : charsets.keySet()) {
Charset charset = charsets.get(s);
@@ -56,9 +61,9 @@ public class Utf8Helper {
int minLen = Integer.MAX_VALUE;
try {
for (int i = 0; i < 65536; i++) {
ByteBuffer buf = charset.encode("" + (char) i);
int len = buf.remaining();
if (len > maxLen) {
maxLen = len;
}
@@ -68,12 +73,13 @@ public class Utf8Helper {
}
if ((minLen == maxLen && minLen == 1) || allowedVariableLengthCharsets.contains(s)) {
allowedCharsets.add(s);
}
}
} catch (UnsupportedOperationException ex) {
//System.out.println(s + " ... ERROR");
}
}
return allowedCharsets;
}
public static String urlDecode(String s) {