org.docx4j.org.apache.xml.security.c14n.implementations.UtfHelpper Maven / Gradle / Ivy
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docx4j is a library which helps you to work with the Office Open
XML file format as used in docx
documents, pptx presentations, and xlsx spreadsheets.
/* NOTICE: This file has been changed by Plutext Pty Ltd for use in docx4j.
* The package name has been changed; there may also be other changes.
*
* This notice is included to meet the condition in clause 4(b) of the License.
*/
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.docx4j.org.apache.xml.security.c14n.implementations;
import java.io.IOException;
import java.io.OutputStream;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Map;
public final class UtfHelpper {
/**
* Revert to the old behavior (version 2 or before), i.e. surrogate pairs characters becomes
* '??' in output. Set system property org.docx4j.org.apache.xml.security.c14n.oldUtf8=true if you want
* to verify signatures generated by version 2 or before that contains 32 bit chars in the
* XML document.
*/
private static final boolean OLD_UTF8 =
AccessController.doPrivileged(new PrivilegedAction() {
public Boolean run() {
return Boolean.getBoolean
("org.docx4j.org.apache.xml.security.c14n.oldUtf8");
}
});
private UtfHelpper() {
// complete
}
public static void writeByte(
final String str,
final OutputStream out,
Map cache
) throws IOException {
byte[] result = cache.get(str);
if (result == null) {
result = getStringInUtf8(str);
cache.put(str, result);
}
out.write(result);
}
public static void writeCodePointToUtf8(final int c, final OutputStream out) throws IOException {
if (!Character.isValidCodePoint(c) || c >= 0xD800 && c <= 0xDBFF || c >= 0xDC00 && c <= 0xDFFF) {
// valid code point: c >= 0x0000 && c <= 0x10FFFF
out.write(0x3f);
return;
}
if (OLD_UTF8 && c >= Character.MIN_SUPPLEMENTARY_CODE_POINT) {
// version 2 or before output 2 question mark characters for 32 bit chars
out.write(0x3f);
out.write(0x3f);
return;
}
if (c < 0x80) {
// 0x00000000 - 0x0000007F
// 0xxxxxxx
out.write(c);
return;
}
byte extraByte = 0;
if (c < 0x800) {
// 0x00000080 - 0x000007FF
// 110xxxxx 10xxxxxx
extraByte = 1;
} else if (c < 0x10000) {
// 0x00000800 - 0x0000FFFF
// 1110xxxx 10xxxxxx 10xxxxxx
extraByte = 2;
} else if (c < 0x200000) {
// 0x00010000 - 0x001FFFFF
// 11110xxx 10xxxxx 10xxxxxx 10xxxxxx
extraByte = 3;
} else if (c < 0x4000000) {
// 0x00200000 - 0x03FFFFFF
// 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
// already outside valid Character range, just for completeness
extraByte = 4;
} else if (c <= 0x7FFFFFFF) {
// 0x04000000 - 0x7FFFFFFF
// 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
// already outside valid Character range, just for completeness
extraByte = 5;
} else {
// 0x80000000 - 0xFFFFFFFF
// case not possible as java has no unsigned int
out.write(0x3f);
return;
}
byte write;
int shift = 6 * extraByte;
write = (byte)((0xFE << (6 - extraByte)) | (c >>> shift));
out.write(write);
for (int i = extraByte - 1; i >= 0; i--) {
shift -= 6;
write = (byte)(0x80 | ((c >>> shift) & 0x3F));
out.write(write);
}
}
public static void writeStringToUtf8(
final String str, final OutputStream out
) throws IOException {
final int length = str.length();
int i = 0;
int c;
while (i < length) {
c = str.codePointAt(i);
i += Character.charCount(c);
if (!Character.isValidCodePoint(c) || c >= 0xD800 && c <= 0xDBFF || c >= 0xDC00 && c <= 0xDFFF) {
// valid code point: c >= 0x0000 && c <= 0x10FFFF
out.write(0x3f);
continue;
}
if (OLD_UTF8 && c >= Character.MIN_SUPPLEMENTARY_CODE_POINT) {
// version 2 or before output 2 question mark characters for 32 bit chars
out.write(0x3f);
out.write(0x3f);
continue;
}
if (c < 0x80) {
out.write(c);
continue;
}
byte extraByte = 0;
if (c < 0x800) {
// 0x00000080 - 0x000007FF
// 110xxxxx 10xxxxxx
extraByte = 1;
} else if (c < 0x10000) {
// 0x00000800 - 0x0000FFFF
// 1110xxxx 10xxxxxx 10xxxxxx
extraByte = 2;
} else if (c < 0x200000) {
// 0x00010000 - 0x001FFFFF
// 11110xxx 10xxxxx 10xxxxxx 10xxxxxx
extraByte = 3;
} else if (c < 0x4000000) {
// 0x00200000 - 0x03FFFFFF
// 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
// already outside valid Character range, just for completeness
extraByte = 4;
} else if (c <= 0x7FFFFFFF) {
// 0x04000000 - 0x7FFFFFFF
// 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
// already outside valid Character range, just for completeness
extraByte = 5;
} else {
// 0x80000000 - 0xFFFFFFFF
// case not possible as java has no unsigned int
out.write(0x3f);
continue;
}
byte write;
int shift = 6 * extraByte;
write = (byte)((0xFE << (6 - extraByte)) | (c >>> shift));
out.write(write);
for (int j = extraByte - 1; j >= 0; j--) {
shift -= 6;
write = (byte)(0x80 | ((c >>> shift) & 0x3F));
out.write(write);
}
}
}
public static byte[] getStringInUtf8(final String str) {
final int length = str.length();
boolean expanded = false;
byte[] result = new byte[length];
int i = 0;
int out = 0;
int c;
while (i < length) {
c = str.codePointAt(i);
i += Character.charCount(c);
if (!Character.isValidCodePoint(c) || c >= 0xD800 && c <= 0xDBFF || c >= 0xDC00 && c <= 0xDFFF) {
// valid code point: c >= 0x0000 && c <= 0x10FFFF
result[out++] = (byte)0x3f;
continue;
}
if (OLD_UTF8 && c >= Character.MIN_SUPPLEMENTARY_CODE_POINT) {
// version 2 or before output 2 question mark characters for 32 bit chars
result[out++] = (byte)0x3f;
result[out++] = (byte)0x3f;
continue;
}
if (c < 0x80) {
result[out++] = (byte)c;
continue;
}
if (!expanded) {
byte newResult[] = new byte[6*length];
System.arraycopy(result, 0, newResult, 0, out);
result = newResult;
expanded = true;
}
byte extraByte = 0;
if (c < 0x800) {
// 0x00000080 - 0x000007FF
// 110xxxxx 10xxxxxx
extraByte = 1;
} else if (c < 0x10000) {
// 0x00000800 - 0x0000FFFF
// 1110xxxx 10xxxxxx 10xxxxxx
extraByte = 2;
} else if (c < 0x200000) {
// 0x00010000 - 0x001FFFFF
// 11110xxx 10xxxxx 10xxxxxx 10xxxxxx
extraByte = 3;
} else if (c < 0x4000000) {
// 0x00200000 - 0x03FFFFFF
// 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
// already outside valid Character range, just for completeness
extraByte = 4;
} else if (c <= 0x7FFFFFFF) {
// 0x04000000 - 0x7FFFFFFF
// 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
// already outside valid Character range, just for completeness
extraByte = 5;
} else {
// 0x80000000 - 0xFFFFFFFF
// case not possible as java has no unsigned int
result[out++] = 0x3f;
continue;
}
byte write;
int shift = 6 * extraByte;
write = (byte)((0xFE << (6 - extraByte)) | (c >>> shift));
result[out++] = write;
for (int j = extraByte - 1; j >= 0; j--) {
shift -= 6;
write = (byte)(0x80 | ((c >>> shift) & 0x3F));
result[out++] = write;
}
}
if (expanded) {
byte newResult[] = new byte[out];
System.arraycopy(result, 0, newResult, 0, out);
result = newResult;
}
return result;
}
}