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com.sun.xml.fastinfoset.algorithm.BASE64EncodingAlgorithm Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2004, 2021 Oracle and/or its affiliates. All rights reserved.
*
* Oracle 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 com.sun.xml.fastinfoset.algorithm;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.jvnet.fastinfoset.EncodingAlgorithmException;
import com.sun.xml.fastinfoset.CommonResourceBundle;
public class BASE64EncodingAlgorithm extends BuiltInEncodingAlgorithm {
/* package */ static final char encodeBase64[] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
};
/* package */ static final int decodeBase64[] = {
/*'+'*/ 62,
-1, -1, -1,
/*'/'*/ 63,
/*'0'*/ 52,
/*'1'*/ 53,
/*'2'*/ 54,
/*'3'*/ 55,
/*'4'*/ 56,
/*'5'*/ 57,
/*'6'*/ 58,
/*'7'*/ 59,
/*'8'*/ 60,
/*'9'*/ 61,
-1, -1, -1, -1, -1, -1, -1,
/*'A'*/ 0,
/*'B'*/ 1,
/*'C'*/ 2,
/*'D'*/ 3,
/*'E'*/ 4,
/*'F'*/ 5,
/*'G'*/ 6,
/*'H'*/ 7,
/*'I'*/ 8,
/*'J'*/ 9,
/*'K'*/ 10,
/*'L'*/ 11,
/*'M'*/ 12,
/*'N'*/ 13,
/*'O'*/ 14,
/*'P'*/ 15,
/*'Q'*/ 16,
/*'R'*/ 17,
/*'S'*/ 18,
/*'T'*/ 19,
/*'U'*/ 20,
/*'V'*/ 21,
/*'W'*/ 22,
/*'X'*/ 23,
/*'Y'*/ 24,
/*'Z'*/ 25,
-1, -1, -1, -1, -1, -1,
/*'a'*/ 26,
/*'b'*/ 27,
/*'c'*/ 28,
/*'d'*/ 29,
/*'e'*/ 30,
/*'f'*/ 31,
/*'g'*/ 32,
/*'h'*/ 33,
/*'i'*/ 34,
/*'j'*/ 35,
/*'k'*/ 36,
/*'l'*/ 37,
/*'m'*/ 38,
/*'n'*/ 39,
/*'o'*/ 40,
/*'p'*/ 41,
/*'q'*/ 42,
/*'r'*/ 43,
/*'s'*/ 44,
/*'t'*/ 45,
/*'u'*/ 46,
/*'v'*/ 47,
/*'w'*/ 48,
/*'x'*/ 49,
/*'y'*/ 50,
/*'z'*/ 51
};
public final Object decodeFromBytes(byte[] b, int start, int length) throws EncodingAlgorithmException {
final byte[] data = new byte[length];
System.arraycopy(b, start, data, 0, length);
return data;
}
public final Object decodeFromInputStream(InputStream s) throws IOException {
throw new UnsupportedOperationException(CommonResourceBundle.getInstance().getString("message.notImplemented"));
}
public void encodeToOutputStream(Object data, OutputStream s) throws IOException {
if (!(data instanceof byte[])) {
throw new IllegalArgumentException(CommonResourceBundle.getInstance().getString("message.dataNotByteArray"));
}
s.write((byte[])data);
}
public final Object convertFromCharacters(char[] ch, int start, int length) {
if (length == 0) {
return new byte[0];
}
StringBuilder encodedValue = removeWhitespace(ch, start, length);
int encodedLength = encodedValue.length();
if (encodedLength == 0) {
return new byte[0];
}
int blockCount = encodedLength / 4;
int partialBlockLength = 3;
if (encodedValue.charAt(encodedLength - 1) == '=') {
--partialBlockLength;
if (encodedValue.charAt(encodedLength - 2) == '=') {
--partialBlockLength;
}
}
int valueLength = (blockCount - 1) * 3 + partialBlockLength;
byte[] value = new byte[valueLength];
int idx = 0;
int encodedIdx = 0;
for (int i = 0; i < blockCount; ++i) {
int x1 = decodeBase64[encodedValue.charAt(encodedIdx++) - '+'];
int x2 = decodeBase64[encodedValue.charAt(encodedIdx++) - '+'];
int x3 = decodeBase64[encodedValue.charAt(encodedIdx++) - '+'];
int x4 = decodeBase64[encodedValue.charAt(encodedIdx++) - '+'];
value[idx++] = (byte) ((x1 << 2) | (x2 >> 4));
if (idx < valueLength) {
value[idx++] = (byte) (((x2 & 0x0f) << 4) | (x3 >> 2));
}
if (idx < valueLength) {
value[idx++] = (byte) (((x3 & 0x03) << 6) | x4);
}
}
return value;
}
public final void convertToCharacters(Object data, StringBuffer s) {
if (data == null) {
return;
}
final byte[] value = (byte[]) data;
convertToCharacters(value, 0, value.length, s);
}
public final int getPrimtiveLengthFromOctetLength(int octetLength) throws EncodingAlgorithmException {
return octetLength;
}
public int getOctetLengthFromPrimitiveLength(int primitiveLength) {
return primitiveLength;
}
public final void encodeToBytes(Object array, int astart, int alength, byte[] b, int start) {
System.arraycopy((byte[])array, astart, b, start, alength);
}
public final void convertToCharacters(byte[] data, int offset, int length, StringBuffer s) {
if (data == null) {
return;
}
final byte[] value = data;
if (length == 0) {
return;
}
final int partialBlockLength = length % 3;
final int blockCount = (partialBlockLength != 0) ?
length / 3 + 1 :
length / 3;
final int encodedLength = blockCount * 4;
final int originalBufferSize = s.length();
s.ensureCapacity(encodedLength + originalBufferSize);
int idx = offset;
int lastIdx = offset + length;
for (int i = 0; i < blockCount; ++i) {
int b1 = value[idx++] & 0xFF;
int b2 = (idx < lastIdx) ? value[idx++] & 0xFF : 0;
int b3 = (idx < lastIdx) ? value[idx++] & 0xFF : 0;
s.append(encodeBase64[b1 >> 2]);
s.append(encodeBase64[((b1 & 0x03) << 4) | (b2 >> 4)]);
s.append(encodeBase64[((b2 & 0x0f) << 2) | (b3 >> 6)]);
s.append(encodeBase64[b3 & 0x3f]);
}
switch (partialBlockLength) {
case 1 :
s.setCharAt(originalBufferSize + encodedLength - 1, '=');
s.setCharAt(originalBufferSize + encodedLength - 2, '=');
break;
case 2 :
s.setCharAt(originalBufferSize + encodedLength - 1, '=');
break;
}
}
}
