org.apache.xml.security.c14n.implementations.UtfHelpper Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of xmlsec Show documentation
Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.
There is a newer version: 4.0.3
Show newest version
/**
 * 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.apache.xml.security.c14n.implementations;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;

public class UtfHelpper {

    final 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);
    }

    final static void writeCharToUtf8(final char c, final OutputStream out) throws IOException {   	
        if (c < 0x80) {
            out.write(c);
            return;
        }
        if ((c >= 0xD800 && c <= 0xDBFF) || (c >= 0xDC00 && c <= 0xDFFF)) {
            //No Surrogates in sun java
            out.write(0x3f);
            return;
        }
        int bias;
        int write;
        char ch;
        if (c > 0x07FF) {
            ch = (char)(c>>>12);      
            write = 0xE0;
            if (ch > 0) {
                write |= (ch & 0x0F);
            } 
            out.write(write);
            write = 0x80;
            bias = 0x3F;        
        } else {
            write = 0xC0;
            bias = 0x1F;
        }
        ch = (char)(c>>>6);
        if (ch > 0) {
            write |= (ch & bias);
        } 
        out.write(write);
        out.write(0x80 | ((c) & 0x3F));    

    }

    final static void writeStringToUtf8(
        final String str,
        final OutputStream out
    ) throws IOException{	   
        final int length = str.length();
        int i = 0;
        char c;    
        while (i < length) {
            c = str.charAt(i++);        
            if (c < 0x80)  {
                out.write(c);
                continue;
            }
            if ((c >= 0xD800 && c <= 0xDBFF) || (c >= 0xDC00 && c <= 0xDFFF)) {
                //No Surrogates in sun java
                out.write(0x3f);
                continue;
            }
            char ch;
            int bias;
            int write;
            if (c > 0x07FF) {
                ch = (char)(c>>>12);      
                write = 0xE0;
                if (ch > 0) {
                    write |= (ch & 0x0F);
                } 
                out.write(write);
                write = 0x80;
                bias = 0x3F;        
            } else {
                write = 0xC0;
                bias = 0x1F;
            }
            ch = (char)(c>>>6);
            if (ch > 0) {
                write |= (ch & bias);
            } 
            out.write(write);
            out.write(0x80 | ((c) & 0x3F));       

        }

    }
    
    public final 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;
        char c;    
        while (i < length) {
            c = str.charAt(i++);        
            if (c < 0x80) {
                result[out++] = (byte)c;
                continue;
            }
            if ((c >= 0xD800 && c <= 0xDBFF) || (c >= 0xDC00 && c <= 0xDFFF)) {  	
                //No Surrogates in sun java
                result[out++] = 0x3f;
                continue;
            }
            if (!expanded) {
                byte newResult[] = new byte[3*length];
                System.arraycopy(result, 0, newResult, 0, out);				   	    	
                result = newResult;
                expanded = true;
            } 
            char ch;
            int bias;
            byte write;
            if (c > 0x07FF) {
                ch = (char)(c>>>12);      
                write = (byte)0xE0;
                if (ch > 0) {
                    write |= (ch & 0x0F);
                } 
                result[out++] = write;
                write = (byte)0x80;
                bias = 0x3F;        
            } else {
                write = (byte)0xC0;
                bias = 0x1F;
            }
            ch = (char)(c>>>6);
            if (ch > 0) {
                write |= (ch & bias);
            } 
            result[out++] = write;
            result[out++] = (byte)(0x80 | ((c) & 0x3F)); 
        }
        if (expanded) {
            byte newResult[] = new byte[out];
            System.arraycopy(result, 0, newResult, 0, out);
            result = newResult;
        }
        return result;
    }

}