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67 lines
2.2 KiB
Java
67 lines
2.2 KiB
Java
/* ========================================================================
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* PlantUML : a free UML diagram generator
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* ========================================================================
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*
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* (C) Copyright 2009-2017, Arnaud Roques
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*
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* Project Info: http://plantuml.com
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*
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* If you like this project or if you find it useful, you can support us at:
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*
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* http://plantuml.com/patreon (only 1$ per month!)
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* http://plantuml.com/paypal
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*
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* This file is part of PlantUML.
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*
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* PlantUML is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* PlantUML distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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* License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*
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*
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* Original Author: Arnaud Roques
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*
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*
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*/
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package net.sourceforge.plantuml.code;
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public class AsciiEncoderFinalZeros {
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public String encode(byte data[]) {
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if (data == null) {
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return "";
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}
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final StringBuilder result = new StringBuilder((data.length * 4 + 2) / 3);
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for (int i = 0; i < data.length; i += 3) {
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append3bytes(result, data[i] & 0xFF, i + 1 < data.length ? data[i + 1] & 0xFF : 0,
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i + 2 < data.length ? data[i + 2] & 0xFF : 0);
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}
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while (result.length() > 0 && result.charAt(result.length() - 1) == '0') {
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result.setLength(result.length() - 1);
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}
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return result.toString();
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}
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private void append3bytes(StringBuilder sb, int b1, int b2, int b3) {
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final int c1 = b1 >> 2;
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final int c2 = ((b1 & 0x3) << 4) | (b2 >> 4);
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final int c3 = ((b2 & 0xF) << 2) | (b3 >> 6);
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final int c4 = b3 & 0x3F;
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sb.append(AsciiEncoder.encode6bit[c1 & 0x3F]);
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sb.append(AsciiEncoder.encode6bit[c2 & 0x3F]);
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sb.append(AsciiEncoder.encode6bit[c3 & 0x3F]);
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sb.append(AsciiEncoder.encode6bit[c4 & 0x3F]);
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}
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}
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