/**
* 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.jute;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
/**
* Various utility functions for Hadoop record I/O runtime.
*/
public class Utils {
/** Cannot create a new instance of Utils */
private Utils() {
super();
}
/**
* equals function that actually compares two buffers.
*
* @param onearray First buffer
* @param twoarray Second buffer
* @return true if one and two contain exactly the same content, else false.
*/
public static boolean bufEquals(byte onearray[], byte twoarray[] ) {
if (onearray == twoarray) return true;
boolean ret = (onearray.length == twoarray.length);
if (!ret) {
return ret;
}
for (int idx = 0; idx < onearray.length; idx++) {
if (onearray[idx] != twoarray[idx]) {
return false;
}
}
return true;
}
private static final char[] hexchars = { '0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'A', 'B',
'C', 'D', 'E', 'F' };
/**
*
* @param s
* @return
*/
static String toXMLString(String s) {
if (s == null)
return "";
StringBuilder sb = new StringBuilder();
for (int idx = 0; idx < s.length(); idx++) {
char ch = s.charAt(idx);
if (ch == '<') {
sb.append("<");
} else if (ch == '&') {
sb.append("&");
} else if (ch == '%') {
sb.append("%25");
} else if (ch < 0x20) {
sb.append("%");
sb.append(hexchars[ch/16]);
sb.append(hexchars[ch%16]);
} else {
sb.append(ch);
}
}
return sb.toString();
}
static private int h2c(char ch) {
if (ch >= '0' && ch <= '9') {
return ch - '0';
} else if (ch >= 'A' && ch <= 'F') {
return ch - 'A';
} else if (ch >= 'a' && ch <= 'f') {
return ch - 'a';
}
return 0;
}
/**
*
* @param s
* @return
*/
static String fromXMLString(String s) {
StringBuilder sb = new StringBuilder();
for (int idx = 0; idx < s.length();) {
char ch = s.charAt(idx++);
if (ch == '%') {
char ch1 = s.charAt(idx++);
char ch2 = s.charAt(idx++);
char res = (char)(h2c(ch1)*16 + h2c(ch2));
sb.append(res);
} else {
sb.append(ch);
}
}
return sb.toString();
}
/**
*
* @param s
* @return
*/
static String toCSVString(String s) {
if (s == null)
return "";
StringBuilder sb = new StringBuilder(s.length()+1);
sb.append('\'');
int len = s.length();
for (int i = 0; i < len; i++) {
char c = s.charAt(i);
switch(c) {
case '\0':
sb.append("%00");
break;
case '\n':
sb.append("%0A");
break;
case '\r':
sb.append("%0D");
break;
case ',':
sb.append("%2C");
break;
case '}':
sb.append("%7D");
break;
case '%':
sb.append("%25");
break;
default:
sb.append(c);
}
}
return sb.toString();
}
/**
*
* @param s
* @throws java.io.IOException
* @return
*/
static String fromCSVString(String s) throws IOException {
if (s.charAt(0) != '\'') {
throw new IOException("Error deserializing string.");
}
int len = s.length();
StringBuilder sb = new StringBuilder(len-1);
for (int i = 1; i < len; i++) {
char c = s.charAt(i);
if (c == '%') {
char ch1 = s.charAt(i+1);
char ch2 = s.charAt(i+2);
i += 2;
if (ch1 == '0' && ch2 == '0') { sb.append('\0'); }
else if (ch1 == '0' && ch2 == 'A') { sb.append('\n'); }
else if (ch1 == '0' && ch2 == 'D') { sb.append('\r'); }
else if (ch1 == '2' && ch2 == 'C') { sb.append(','); }
else if (ch1 == '7' && ch2 == 'D') { sb.append('}'); }
else if (ch1 == '2' && ch2 == '5') { sb.append('%'); }
else {throw new IOException("Error deserializing string.");}
} else {
sb.append(c);
}
}
return sb.toString();
}
/**
*
* @param s
* @return
*/
static String toXMLBuffer(byte barr[]) {
if (barr == null || barr.length == 0) {
return "";
}
StringBuilder sb = new StringBuilder(2*barr.length);
for (int idx = 0; idx < barr.length; idx++) {
sb.append(Integer.toHexString(barr[idx]));
}
return sb.toString();
}
/**
*
* @param s
* @throws java.io.IOException
* @return
*/
static byte[] fromXMLBuffer(String s)
throws IOException {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
if (s.length() == 0) { return stream.toByteArray(); }
int blen = s.length()/2;
byte[] barr = new byte[blen];
for (int idx = 0; idx < blen; idx++) {
char c1 = s.charAt(2*idx);
char c2 = s.charAt(2*idx+1);
barr[idx] = Byte.parseByte(""+c1+c2, 16);
}
stream.write(barr);
return stream.toByteArray();
}
/**
*
* @param buf
* @return
*/
static String toCSVBuffer(byte barr[]) {
if (barr == null || barr.length == 0) {
return "";
}
StringBuilder sb = new StringBuilder(barr.length + 1);
sb.append('#');
for(int idx = 0; idx < barr.length; idx++) {
sb.append(Integer.toHexString(barr[idx]));
}
return sb.toString();
}
/**
* Converts a CSV-serialized representation of buffer to a new
* ByteArrayOutputStream.
* @param s CSV-serialized representation of buffer
* @throws java.io.IOException
* @return Deserialized ByteArrayOutputStream
*/
static byte[] fromCSVBuffer(String s)
throws IOException {
if (s.charAt(0) != '#') {
throw new IOException("Error deserializing buffer.");
}
ByteArrayOutputStream stream = new ByteArrayOutputStream();
if (s.length() == 1) { return stream.toByteArray(); }
int blen = (s.length()-1)/2;
byte[] barr = new byte[blen];
for (int idx = 0; idx < blen; idx++) {
char c1 = s.charAt(2*idx+1);
char c2 = s.charAt(2*idx+2);
barr[idx] = Byte.parseByte(""+c1+c2, 16);
}
stream.write(barr);
return stream.toByteArray();
}
public static int compareBytes(byte b1[], int off1, int len1, byte b2[], int off2, int len2) {
int i;
for(i=0; i < len1 && i < len2; i++) {
if (b1[off1+i] != b2[off2+i]) {
return b1[off1+i] < b2[off2+1] ? -1 : 1;
}
}
if (len1 != len2) {
return len1 < len2 ? -1 : 1;
}
return 0;
}
}