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+package org.r3pek.droiduptime;
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+
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+import java.util.Arrays;
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+
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+/** A very fast and memory efficient class to encode and decode to and from BASE64 in full accordance
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+ * with RFC 2045.<br><br>
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+ * On Windows XP sp1 with 1.4.2_04 and later ;), this encoder and decoder is about 10 times faster
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+ * on small arrays (10 - 1000 bytes) and 2-3 times as fast on larger arrays (10000 - 1000000 bytes)
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+ * compared to <code>sun.misc.Encoder()/Decoder()</code>.<br><br>
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+ *
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+ * On byte arrays the encoder is about 20% faster than Jakarta Commons Base64 Codec for encode and
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+ * about 50% faster for decoding large arrays. This implementation is about twice as fast on very small
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+ * arrays (< 30 bytes). If source/destination is a <code>String</code> this
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+ * version is about three times as fast due to the fact that the Commons Codec result has to be recoded
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+ * to a <code>String</code> from <code>byte[]</code>, which is very expensive.<br><br>
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+ *
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+ * This encode/decode algorithm doesn't create any temporary arrays as many other codecs do, it only
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+ * allocates the resulting array. This produces less garbage and it is possible to handle arrays twice
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+ * as large as algorithms that create a temporary array. (E.g. Jakarta Commons Codec). It is unknown
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+ * whether Sun's <code>sun.misc.Encoder()/Decoder()</code> produce temporary arrays but since performance
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+ * is quite low it probably does.<br><br>
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+ *
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+ * The encoder produces the same output as the Sun one except that the Sun's encoder appends
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+ * a trailing line separator if the last character isn't a pad. Unclear why but it only adds to the
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+ * length and is probably a side effect. Both are in conformance with RFC 2045 though.<br>
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+ * Commons codec seem to always att a trailing line separator.<br><br>
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+ *
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+ * <b>Note!</b>
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+ * The encode/decode method pairs (types) come in three versions with the <b>exact</b> same algorithm and
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+ * thus a lot of code redundancy. This is to not create any temporary arrays for transcoding to/from different
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+ * format types. The methods not used can simply be commented out.<br><br>
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+ *
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+ * There is also a "fast" version of all decode methods that works the same way as the normal ones, but
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+ * har a few demands on the decoded input. Normally though, these fast verions should be used if the source if
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+ * the input is known and it hasn't bee tampered with.<br><br>
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+ *
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+ * If you find the code useful or you find a bug, please send me a note at base64 @ miginfocom . com.
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+ *
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+ * Licence (BSD):
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+ * ==============
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+ *
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+ * Copyright (c) 2004, Mikael Grev, MiG InfoCom AB. (base64 @ miginfocom . com)
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+ * All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without modification,
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+ * are permitted provided that the following conditions are met:
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+ * Redistributions of source code must retain the above copyright notice, this list
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+ * of conditions and the following disclaimer.
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+ * Redistributions in binary form must reproduce the above copyright notice, this
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+ * list of conditions and the following disclaimer in the documentation and/or other
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+ * materials provided with the distribution.
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+ * Neither the name of the MiG InfoCom AB nor the names of its contributors may be
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+ * used to endorse or promote products derived from this software without specific
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+ * prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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+ * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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+ * OF SUCH DAMAGE.
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+ *
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+ * @version 2.2
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+ * @author Mikael Grev
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+ * Date: 2004-aug-02
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+ * Time: 11:31:11
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+ */
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+
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+public class Base64
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+{
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+ private static final char[] CA = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
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+ private static final int[] IA = new int[256];
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+ static {
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+ Arrays.fill(IA, -1);
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+ for (int i = 0, iS = CA.length; i < iS; i++)
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+ IA[CA[i]] = i;
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+ IA['='] = 0;
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+ }
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+
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+ // ****************************************************************************************
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+ // * char[] version
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+ // ****************************************************************************************
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+
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+ /** Encodes a raw byte array into a BASE64 <code>char[]</code> representation i accordance with RFC 2045.
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+ * @param sArr The bytes to convert. If <code>null</code> or length 0 an empty array will be returned.
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+ * @param lineSep Optional "\r\n" after 76 characters, unless end of file.<br>
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+ * No line separator will be in breach of RFC 2045 which specifies max 76 per line but will be a
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+ * little faster.
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+ * @return A BASE64 encoded array. Never <code>null</code>.
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+ */
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+ public final static char[] encodeToChar(byte[] sArr, boolean lineSep)
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+ {
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+ // Check special case
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+ int sLen = sArr != null ? sArr.length : 0;
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+ if (sLen == 0)
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+ return new char[0];
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+
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+ int eLen = (sLen / 3) * 3; // Length of even 24-bits.
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+ int cCnt = ((sLen - 1) / 3 + 1) << 2; // Returned character count
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+ int dLen = cCnt + (lineSep ? (cCnt - 1) / 76 << 1 : 0); // Length of returned array
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+ char[] dArr = new char[dLen];
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+
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+ // Encode even 24-bits
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+ for (int s = 0, d = 0, cc = 0; s < eLen;) {
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+ // Copy next three bytes into lower 24 bits of int, paying attension to sign.
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+ int i = (sArr[s++] & 0xff) << 16 | (sArr[s++] & 0xff) << 8 | (sArr[s++] & 0xff);
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+
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+ // Encode the int into four chars
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+ dArr[d++] = CA[(i >>> 18) & 0x3f];
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+ dArr[d++] = CA[(i >>> 12) & 0x3f];
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+ dArr[d++] = CA[(i >>> 6) & 0x3f];
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+ dArr[d++] = CA[i & 0x3f];
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+
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+ // Add optional line separator
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+ if (lineSep && ++cc == 19 && d < dLen - 2) {
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+ dArr[d++] = '\r';
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+ dArr[d++] = '\n';
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+ cc = 0;
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+ }
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+ }
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+
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+ // Pad and encode last bits if source isn't even 24 bits.
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+ int left = sLen - eLen; // 0 - 2.
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+ if (left > 0) {
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+ // Prepare the int
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+ int i = ((sArr[eLen] & 0xff) << 10) | (left == 2 ? ((sArr[sLen - 1] & 0xff) << 2) : 0);
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+
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+ // Set last four chars
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+ dArr[dLen - 4] = CA[i >> 12];
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+ dArr[dLen - 3] = CA[(i >>> 6) & 0x3f];
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+ dArr[dLen - 2] = left == 2 ? CA[i & 0x3f] : '=';
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+ dArr[dLen - 1] = '=';
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+ }
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+ return dArr;
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+ }
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+
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+ /** Decodes a BASE64 encoded char array. All illegal characters will be ignored and can handle both arrays with
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+ * and without line separators.
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+ * @param sArr The source array. <code>null</code> or length 0 will return an empty array.
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+ * @return The decoded array of bytes. May be of length 0. Will be <code>null</code> if the legal characters
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+ * (including '=') isn't divideable by 4. (I.e. definitely corrupted).
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+ */
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+ public final static byte[] decode(char[] sArr)
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+ {
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+ // Check special case
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+ int sLen = sArr != null ? sArr.length : 0;
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+ if (sLen == 0)
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+ return new byte[0];
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+
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+ // Count illegal characters (including '\r', '\n') to know what size the returned array will be,
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+ // so we don't have to reallocate & copy it later.
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+ int sepCnt = 0; // Number of separator characters. (Actually illegal characters, but that's a bonus...)
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+ for (int i = 0; i < sLen; i++) // If input is "pure" (I.e. no line separators or illegal chars) base64 this loop can be commented out.
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+ if (IA[sArr[i]] < 0)
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+ sepCnt++;
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+
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+ // Check so that legal chars (including '=') are evenly divideable by 4 as specified in RFC 2045.
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+ if ((sLen - sepCnt) % 4 != 0)
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+ return null;
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+
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+ int pad = 0;
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+ for (int i = sLen; i > 1 && IA[sArr[--i]] <= 0;)
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+ if (sArr[i] == '=')
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+ pad++;
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+
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+ int len = ((sLen - sepCnt) * 6 >> 3) - pad;
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+
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+ byte[] dArr = new byte[len]; // Preallocate byte[] of exact length
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+
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+ for (int s = 0, d = 0; d < len;) {
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+ // Assemble three bytes into an int from four "valid" characters.
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+ int i = 0;
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+ for (int j = 0; j < 4; j++) { // j only increased if a valid char was found.
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+ int c = IA[sArr[s++]];
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+ if (c >= 0)
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+ i |= c << (18 - j * 6);
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+ else
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+ j--;
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+ }
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+ // Add the bytes
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+ dArr[d++] = (byte) (i >> 16);
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+ if (d < len) {
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+ dArr[d++]= (byte) (i >> 8);
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+ if (d < len)
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+ dArr[d++] = (byte) i;
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+ }
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+ }
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+ return dArr;
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+ }
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+
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+ /** Decodes a BASE64 encoded char array that is known to be resonably well formatted. The method is about twice as
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+ * fast as {@link #decode(char[])}. The preconditions are:<br>
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+ * + The array must have a line length of 76 chars OR no line separators at all (one line).<br>
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+ * + Line separator must be "\r\n", as specified in RFC 2045
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+ * + The array must not contain illegal characters within the encoded string<br>
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+ * + The array CAN have illegal characters at the beginning and end, those will be dealt with appropriately.<br>
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+ * @param sArr The source array. Length 0 will return an empty array. <code>null</code> will throw an exception.
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+ * @return The decoded array of bytes. May be of length 0.
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+ */
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+ public final static byte[] decodeFast(char[] sArr)
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+ {
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+ // Check special case
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+ int sLen = sArr.length;
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+ if (sLen == 0)
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+ return new byte[0];
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+
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+ int sIx = 0, eIx = sLen - 1; // Start and end index after trimming.
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+
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+ // Trim illegal chars from start
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+ while (sIx < eIx && IA[sArr[sIx]] < 0)
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+ sIx++;
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+
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+ // Trim illegal chars from end
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+ while (eIx > 0 && IA[sArr[eIx]] < 0)
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+ eIx--;
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+
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+ // get the padding count (=) (0, 1 or 2)
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+ int pad = sArr[eIx] == '=' ? (sArr[eIx - 1] == '=' ? 2 : 1) : 0; // Count '=' at end.
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+ int cCnt = eIx - sIx + 1; // Content count including possible separators
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+ int sepCnt = sLen > 76 ? (sArr[76] == '\r' ? cCnt / 78 : 0) << 1 : 0;
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+
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+ int len = ((cCnt - sepCnt) * 6 >> 3) - pad; // The number of decoded bytes
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+ byte[] dArr = new byte[len]; // Preallocate byte[] of exact length
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+
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+ // Decode all but the last 0 - 2 bytes.
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+ int d = 0;
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+ for (int cc = 0, eLen = (len / 3) * 3; d < eLen;) {
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+ // Assemble three bytes into an int from four "valid" characters.
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+ int i = IA[sArr[sIx++]] << 18 | IA[sArr[sIx++]] << 12 | IA[sArr[sIx++]] << 6 | IA[sArr[sIx++]];
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+
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+ // Add the bytes
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+ dArr[d++] = (byte) (i >> 16);
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+ dArr[d++] = (byte) (i >> 8);
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+ dArr[d++] = (byte) i;
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+
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+ // If line separator, jump over it.
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+ if (sepCnt > 0 && ++cc == 19) {
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+ sIx += 2;
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+ cc = 0;
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+ }
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+ }
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+
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+ if (d < len) {
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+ // Decode last 1-3 bytes (incl '=') into 1-3 bytes
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+ int i = 0;
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+ for (int j = 0; sIx <= eIx - pad; j++)
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+ i |= IA[sArr[sIx++]] << (18 - j * 6);
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+
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+ for (int r = 16; d < len; r -= 8)
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+ dArr[d++] = (byte) (i >> r);
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+ }
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+
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+ return dArr;
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+ }
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+
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+ // ****************************************************************************************
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+ // * byte[] version
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+ // ****************************************************************************************
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+
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+ /** Encodes a raw byte array into a BASE64 <code>byte[]</code> representation i accordance with RFC 2045.
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+ * @param sArr The bytes to convert. If <code>null</code> or length 0 an empty array will be returned.
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+ * @param lineSep Optional "\r\n" after 76 characters, unless end of file.<br>
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+ * No line separator will be in breach of RFC 2045 which specifies max 76 per line but will be a
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+ * little faster.
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+ * @return A BASE64 encoded array. Never <code>null</code>.
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+ */
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+ public final static byte[] encodeToByte(byte[] sArr, boolean lineSep)
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+ {
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+ // Check special case
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+ int sLen = sArr != null ? sArr.length : 0;
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+ if (sLen == 0)
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276
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+ return new byte[0];
|
|
|
277
|
+
|
|
|
278
|
+ int eLen = (sLen / 3) * 3; // Length of even 24-bits.
|
|
|
279
|
+ int cCnt = ((sLen - 1) / 3 + 1) << 2; // Returned character count
|
|
|
280
|
+ int dLen = cCnt + (lineSep ? (cCnt - 1) / 76 << 1 : 0); // Length of returned array
|
|
|
281
|
+ byte[] dArr = new byte[dLen];
|
|
|
282
|
+
|
|
|
283
|
+ // Encode even 24-bits
|
|
|
284
|
+ for (int s = 0, d = 0, cc = 0; s < eLen;) {
|
|
|
285
|
+ // Copy next three bytes into lower 24 bits of int, paying attension to sign.
|
|
|
286
|
+ int i = (sArr[s++] & 0xff) << 16 | (sArr[s++] & 0xff) << 8 | (sArr[s++] & 0xff);
|
|
|
287
|
+
|
|
|
288
|
+ // Encode the int into four chars
|
|
|
289
|
+ dArr[d++] = (byte) CA[(i >>> 18) & 0x3f];
|
|
|
290
|
+ dArr[d++] = (byte) CA[(i >>> 12) & 0x3f];
|
|
|
291
|
+ dArr[d++] = (byte) CA[(i >>> 6) & 0x3f];
|
|
|
292
|
+ dArr[d++] = (byte) CA[i & 0x3f];
|
|
|
293
|
+
|
|
|
294
|
+ // Add optional line separator
|
|
|
295
|
+ if (lineSep && ++cc == 19 && d < dLen - 2) {
|
|
|
296
|
+ dArr[d++] = '\r';
|
|
|
297
|
+ dArr[d++] = '\n';
|
|
|
298
|
+ cc = 0;
|
|
|
299
|
+ }
|
|
|
300
|
+ }
|
|
|
301
|
+
|
|
|
302
|
+ // Pad and encode last bits if source isn't an even 24 bits.
|
|
|
303
|
+ int left = sLen - eLen; // 0 - 2.
|
|
|
304
|
+ if (left > 0) {
|
|
|
305
|
+ // Prepare the int
|
|
|
306
|
+ int i = ((sArr[eLen] & 0xff) << 10) | (left == 2 ? ((sArr[sLen - 1] & 0xff) << 2) : 0);
|
|
|
307
|
+
|
|
|
308
|
+ // Set last four chars
|
|
|
309
|
+ dArr[dLen - 4] = (byte) CA[i >> 12];
|
|
|
310
|
+ dArr[dLen - 3] = (byte) CA[(i >>> 6) & 0x3f];
|
|
|
311
|
+ dArr[dLen - 2] = left == 2 ? (byte) CA[i & 0x3f] : (byte) '=';
|
|
|
312
|
+ dArr[dLen - 1] = '=';
|
|
|
313
|
+ }
|
|
|
314
|
+ return dArr;
|
|
|
315
|
+ }
|
|
|
316
|
+
|
|
|
317
|
+ /** Decodes a BASE64 encoded byte array. All illegal characters will be ignored and can handle both arrays with
|
|
|
318
|
+ * and without line separators.
|
|
|
319
|
+ * @param sArr The source array. Length 0 will return an empty array. <code>null</code> will throw an exception.
|
|
|
320
|
+ * @return The decoded array of bytes. May be of length 0. Will be <code>null</code> if the legal characters
|
|
|
321
|
+ * (including '=') isn't divideable by 4. (I.e. definitely corrupted).
|
|
|
322
|
+ */
|
|
|
323
|
+ public final static byte[] decode(byte[] sArr)
|
|
|
324
|
+ {
|
|
|
325
|
+ // Check special case
|
|
|
326
|
+ int sLen = sArr.length;
|
|
|
327
|
+
|
|
|
328
|
+ // Count illegal characters (including '\r', '\n') to know what size the returned array will be,
|
|
|
329
|
+ // so we don't have to reallocate & copy it later.
|
|
|
330
|
+ int sepCnt = 0; // Number of separator characters. (Actually illegal characters, but that's a bonus...)
|
|
|
331
|
+ for (int i = 0; i < sLen; i++) // If input is "pure" (I.e. no line separators or illegal chars) base64 this loop can be commented out.
|
|
|
332
|
+ if (IA[sArr[i] & 0xff] < 0)
|
|
|
333
|
+ sepCnt++;
|
|
|
334
|
+
|
|
|
335
|
+ // Check so that legal chars (including '=') are evenly divideable by 4 as specified in RFC 2045.
|
|
|
336
|
+ if ((sLen - sepCnt) % 4 != 0)
|
|
|
337
|
+ return null;
|
|
|
338
|
+
|
|
|
339
|
+ int pad = 0;
|
|
|
340
|
+ for (int i = sLen; i > 1 && IA[sArr[--i] & 0xff] <= 0;)
|
|
|
341
|
+ if (sArr[i] == '=')
|
|
|
342
|
+ pad++;
|
|
|
343
|
+
|
|
|
344
|
+ int len = ((sLen - sepCnt) * 6 >> 3) - pad;
|
|
|
345
|
+
|
|
|
346
|
+ byte[] dArr = new byte[len]; // Preallocate byte[] of exact length
|
|
|
347
|
+
|
|
|
348
|
+ for (int s = 0, d = 0; d < len;) {
|
|
|
349
|
+ // Assemble three bytes into an int from four "valid" characters.
|
|
|
350
|
+ int i = 0;
|
|
|
351
|
+ for (int j = 0; j < 4; j++) { // j only increased if a valid char was found.
|
|
|
352
|
+ int c = IA[sArr[s++] & 0xff];
|
|
|
353
|
+ if (c >= 0)
|
|
|
354
|
+ i |= c << (18 - j * 6);
|
|
|
355
|
+ else
|
|
|
356
|
+ j--;
|
|
|
357
|
+ }
|
|
|
358
|
+
|
|
|
359
|
+ // Add the bytes
|
|
|
360
|
+ dArr[d++] = (byte) (i >> 16);
|
|
|
361
|
+ if (d < len) {
|
|
|
362
|
+ dArr[d++]= (byte) (i >> 8);
|
|
|
363
|
+ if (d < len)
|
|
|
364
|
+ dArr[d++] = (byte) i;
|
|
|
365
|
+ }
|
|
|
366
|
+ }
|
|
|
367
|
+
|
|
|
368
|
+ return dArr;
|
|
|
369
|
+ }
|
|
|
370
|
+
|
|
|
371
|
+
|
|
|
372
|
+ /** Decodes a BASE64 encoded byte array that is known to be resonably well formatted. The method is about twice as
|
|
|
373
|
+ * fast as {@link #decode(byte[])}. The preconditions are:<br>
|
|
|
374
|
+ * + The array must have a line length of 76 chars OR no line separators at all (one line).<br>
|
|
|
375
|
+ * + Line separator must be "\r\n", as specified in RFC 2045
|
|
|
376
|
+ * + The array must not contain illegal characters within the encoded string<br>
|
|
|
377
|
+ * + The array CAN have illegal characters at the beginning and end, those will be dealt with appropriately.<br>
|
|
|
378
|
+ * @param sArr The source array. Length 0 will return an empty array. <code>null</code> will throw an exception.
|
|
|
379
|
+ * @return The decoded array of bytes. May be of length 0.
|
|
|
380
|
+ */
|
|
|
381
|
+ public final static byte[] decodeFast(byte[] sArr)
|
|
|
382
|
+ {
|
|
|
383
|
+ // Check special case
|
|
|
384
|
+ int sLen = sArr.length;
|
|
|
385
|
+ if (sLen == 0)
|
|
|
386
|
+ return new byte[0];
|
|
|
387
|
+
|
|
|
388
|
+ int sIx = 0, eIx = sLen - 1; // Start and end index after trimming.
|
|
|
389
|
+
|
|
|
390
|
+ // Trim illegal chars from start
|
|
|
391
|
+ while (sIx < eIx && IA[sArr[sIx] & 0xff] < 0)
|
|
|
392
|
+ sIx++;
|
|
|
393
|
+
|
|
|
394
|
+ // Trim illegal chars from end
|
|
|
395
|
+ while (eIx > 0 && IA[sArr[eIx] & 0xff] < 0)
|
|
|
396
|
+ eIx--;
|
|
|
397
|
+
|
|
|
398
|
+ // get the padding count (=) (0, 1 or 2)
|
|
|
399
|
+ int pad = sArr[eIx] == '=' ? (sArr[eIx - 1] == '=' ? 2 : 1) : 0; // Count '=' at end.
|
|
|
400
|
+ int cCnt = eIx - sIx + 1; // Content count including possible separators
|
|
|
401
|
+ int sepCnt = sLen > 76 ? (sArr[76] == '\r' ? cCnt / 78 : 0) << 1 : 0;
|
|
|
402
|
+
|
|
|
403
|
+ int len = ((cCnt - sepCnt) * 6 >> 3) - pad; // The number of decoded bytes
|
|
|
404
|
+ byte[] dArr = new byte[len]; // Preallocate byte[] of exact length
|
|
|
405
|
+
|
|
|
406
|
+ // Decode all but the last 0 - 2 bytes.
|
|
|
407
|
+ int d = 0;
|
|
|
408
|
+ for (int cc = 0, eLen = (len / 3) * 3; d < eLen;) {
|
|
|
409
|
+ // Assemble three bytes into an int from four "valid" characters.
|
|
|
410
|
+ int i = IA[sArr[sIx++]] << 18 | IA[sArr[sIx++]] << 12 | IA[sArr[sIx++]] << 6 | IA[sArr[sIx++]];
|
|
|
411
|
+
|
|
|
412
|
+ // Add the bytes
|
|
|
413
|
+ dArr[d++] = (byte) (i >> 16);
|
|
|
414
|
+ dArr[d++] = (byte) (i >> 8);
|
|
|
415
|
+ dArr[d++] = (byte) i;
|
|
|
416
|
+
|
|
|
417
|
+ // If line separator, jump over it.
|
|
|
418
|
+ if (sepCnt > 0 && ++cc == 19) {
|
|
|
419
|
+ sIx += 2;
|
|
|
420
|
+ cc = 0;
|
|
|
421
|
+ }
|
|
|
422
|
+ }
|
|
|
423
|
+
|
|
|
424
|
+ if (d < len) {
|
|
|
425
|
+ // Decode last 1-3 bytes (incl '=') into 1-3 bytes
|
|
|
426
|
+ int i = 0;
|
|
|
427
|
+ for (int j = 0; sIx <= eIx - pad; j++)
|
|
|
428
|
+ i |= IA[sArr[sIx++]] << (18 - j * 6);
|
|
|
429
|
+
|
|
|
430
|
+ for (int r = 16; d < len; r -= 8)
|
|
|
431
|
+ dArr[d++] = (byte) (i >> r);
|
|
|
432
|
+ }
|
|
|
433
|
+
|
|
|
434
|
+ return dArr;
|
|
|
435
|
+ }
|
|
|
436
|
+
|
|
|
437
|
+ // ****************************************************************************************
|
|
|
438
|
+ // * String version
|
|
|
439
|
+ // ****************************************************************************************
|
|
|
440
|
+
|
|
|
441
|
+ /** Encodes a raw byte array into a BASE64 <code>String</code> representation i accordance with RFC 2045.
|
|
|
442
|
+ * @param sArr The bytes to convert. If <code>null</code> or length 0 an empty array will be returned.
|
|
|
443
|
+ * @param lineSep Optional "\r\n" after 76 characters, unless end of file.<br>
|
|
|
444
|
+ * No line separator will be in breach of RFC 2045 which specifies max 76 per line but will be a
|
|
|
445
|
+ * little faster.
|
|
|
446
|
+ * @return A BASE64 encoded array. Never <code>null</code>.
|
|
|
447
|
+ */
|
|
|
448
|
+ public final static String encodeToString(byte[] sArr, boolean lineSep)
|
|
|
449
|
+ {
|
|
|
450
|
+ // Reuse char[] since we can't create a String incrementally anyway and StringBuffer/Builder would be slower.
|
|
|
451
|
+ return new String(encodeToChar(sArr, lineSep));
|
|
|
452
|
+ }
|
|
|
453
|
+
|
|
|
454
|
+ /** Decodes a BASE64 encoded <code>String</code>. All illegal characters will be ignored and can handle both strings with
|
|
|
455
|
+ * and without line separators.<br>
|
|
|
456
|
+ * <b>Note!</b> It can be up to about 2x the speed to call <code>decode(str.toCharArray())</code> instead. That
|
|
|
457
|
+ * will create a temporary array though. This version will use <code>str.charAt(i)</code> to iterate the string.
|
|
|
458
|
+ * @param str The source string. <code>null</code> or length 0 will return an empty array.
|
|
|
459
|
+ * @return The decoded array of bytes. May be of length 0. Will be <code>null</code> if the legal characters
|
|
|
460
|
+ * (including '=') isn't divideable by 4. (I.e. definitely corrupted).
|
|
|
461
|
+ */
|
|
|
462
|
+ public final static byte[] decode(String str)
|
|
|
463
|
+ {
|
|
|
464
|
+ // Check special case
|
|
|
465
|
+ int sLen = str != null ? str.length() : 0;
|
|
|
466
|
+ if (sLen == 0)
|
|
|
467
|
+ return new byte[0];
|
|
|
468
|
+
|
|
|
469
|
+ // Count illegal characters (including '\r', '\n') to know what size the returned array will be,
|
|
|
470
|
+ // so we don't have to reallocate & copy it later.
|
|
|
471
|
+ int sepCnt = 0; // Number of separator characters. (Actually illegal characters, but that's a bonus...)
|
|
|
472
|
+ for (int i = 0; i < sLen; i++) // If input is "pure" (I.e. no line separators or illegal chars) base64 this loop can be commented out.
|
|
|
473
|
+ if (IA[str.charAt(i)] < 0)
|
|
|
474
|
+ sepCnt++;
|
|
|
475
|
+
|
|
|
476
|
+ // Check so that legal chars (including '=') are evenly divideable by 4 as specified in RFC 2045.
|
|
|
477
|
+ if ((sLen - sepCnt) % 4 != 0)
|
|
|
478
|
+ return null;
|
|
|
479
|
+
|
|
|
480
|
+ // Count '=' at end
|
|
|
481
|
+ int pad = 0;
|
|
|
482
|
+ for (int i = sLen; i > 1 && IA[str.charAt(--i)] <= 0;)
|
|
|
483
|
+ if (str.charAt(i) == '=')
|
|
|
484
|
+ pad++;
|
|
|
485
|
+
|
|
|
486
|
+ int len = ((sLen - sepCnt) * 6 >> 3) - pad;
|
|
|
487
|
+
|
|
|
488
|
+ byte[] dArr = new byte[len]; // Preallocate byte[] of exact length
|
|
|
489
|
+
|
|
|
490
|
+ for (int s = 0, d = 0; d < len;) {
|
|
|
491
|
+ // Assemble three bytes into an int from four "valid" characters.
|
|
|
492
|
+ int i = 0;
|
|
|
493
|
+ for (int j = 0; j < 4; j++) { // j only increased if a valid char was found.
|
|
|
494
|
+ int c = IA[str.charAt(s++)];
|
|
|
495
|
+ if (c >= 0)
|
|
|
496
|
+ i |= c << (18 - j * 6);
|
|
|
497
|
+ else
|
|
|
498
|
+ j--;
|
|
|
499
|
+ }
|
|
|
500
|
+ // Add the bytes
|
|
|
501
|
+ dArr[d++] = (byte) (i >> 16);
|
|
|
502
|
+ if (d < len) {
|
|
|
503
|
+ dArr[d++]= (byte) (i >> 8);
|
|
|
504
|
+ if (d < len)
|
|
|
505
|
+ dArr[d++] = (byte) i;
|
|
|
506
|
+ }
|
|
|
507
|
+ }
|
|
|
508
|
+ return dArr;
|
|
|
509
|
+ }
|
|
|
510
|
+
|
|
|
511
|
+ /** Decodes a BASE64 encoded string that is known to be resonably well formatted. The method is about twice as
|
|
|
512
|
+ * fast as {@link #decode(String)}. The preconditions are:<br>
|
|
|
513
|
+ * + The array must have a line length of 76 chars OR no line separators at all (one line).<br>
|
|
|
514
|
+ * + Line separator must be "\r\n", as specified in RFC 2045
|
|
|
515
|
+ * + The array must not contain illegal characters within the encoded string<br>
|
|
|
516
|
+ * + The array CAN have illegal characters at the beginning and end, those will be dealt with appropriately.<br>
|
|
|
517
|
+ * @param s The source string. Length 0 will return an empty array. <code>null</code> will throw an exception.
|
|
|
518
|
+ * @return The decoded array of bytes. May be of length 0.
|
|
|
519
|
+ */
|
|
|
520
|
+ public final static byte[] decodeFast(String s)
|
|
|
521
|
+ {
|
|
|
522
|
+ // Check special case
|
|
|
523
|
+ int sLen = s.length();
|
|
|
524
|
+ if (sLen == 0)
|
|
|
525
|
+ return new byte[0];
|
|
|
526
|
+
|
|
|
527
|
+ int sIx = 0, eIx = sLen - 1; // Start and end index after trimming.
|
|
|
528
|
+
|
|
|
529
|
+ // Trim illegal chars from start
|
|
|
530
|
+ while (sIx < eIx && IA[s.charAt(sIx) & 0xff] < 0)
|
|
|
531
|
+ sIx++;
|
|
|
532
|
+
|
|
|
533
|
+ // Trim illegal chars from end
|
|
|
534
|
+ while (eIx > 0 && IA[s.charAt(eIx) & 0xff] < 0)
|
|
|
535
|
+ eIx--;
|
|
|
536
|
+
|
|
|
537
|
+ // get the padding count (=) (0, 1 or 2)
|
|
|
538
|
+ int pad = s.charAt(eIx) == '=' ? (s.charAt(eIx - 1) == '=' ? 2 : 1) : 0; // Count '=' at end.
|
|
|
539
|
+ int cCnt = eIx - sIx + 1; // Content count including possible separators
|
|
|
540
|
+ int sepCnt = sLen > 76 ? (s.charAt(76) == '\r' ? cCnt / 78 : 0) << 1 : 0;
|
|
|
541
|
+
|
|
|
542
|
+ int len = ((cCnt - sepCnt) * 6 >> 3) - pad; // The number of decoded bytes
|
|
|
543
|
+ byte[] dArr = new byte[len]; // Preallocate byte[] of exact length
|
|
|
544
|
+
|
|
|
545
|
+ // Decode all but the last 0 - 2 bytes.
|
|
|
546
|
+ int d = 0;
|
|
|
547
|
+ for (int cc = 0, eLen = (len / 3) * 3; d < eLen;) {
|
|
|
548
|
+ // Assemble three bytes into an int from four "valid" characters.
|
|
|
549
|
+ int i = IA[s.charAt(sIx++)] << 18 | IA[s.charAt(sIx++)] << 12 | IA[s.charAt(sIx++)] << 6 | IA[s.charAt(sIx++)];
|
|
|
550
|
+
|
|
|
551
|
+ // Add the bytes
|
|
|
552
|
+ dArr[d++] = (byte) (i >> 16);
|
|
|
553
|
+ dArr[d++] = (byte) (i >> 8);
|
|
|
554
|
+ dArr[d++] = (byte) i;
|
|
|
555
|
+
|
|
|
556
|
+ // If line separator, jump over it.
|
|
|
557
|
+ if (sepCnt > 0 && ++cc == 19) {
|
|
|
558
|
+ sIx += 2;
|
|
|
559
|
+ cc = 0;
|
|
|
560
|
+ }
|
|
|
561
|
+ }
|
|
|
562
|
+
|
|
|
563
|
+ if (d < len) {
|
|
|
564
|
+ // Decode last 1-3 bytes (incl '=') into 1-3 bytes
|
|
|
565
|
+ int i = 0;
|
|
|
566
|
+ for (int j = 0; sIx <= eIx - pad; j++)
|
|
|
567
|
+ i |= IA[s.charAt(sIx++)] << (18 - j * 6);
|
|
|
568
|
+
|
|
|
569
|
+ for (int r = 16; d < len; r -= 8)
|
|
|
570
|
+ dArr[d++] = (byte) (i >> r);
|
|
|
571
|
+ }
|
|
|
572
|
+
|
|
|
573
|
+ return dArr;
|
|
|
574
|
+ }
|
|
|
575
|
+}
|
