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/*
* Copyright (C) 2002-2012 XimpleWare, [email protected]
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package com.ximpleware.transcode;
import com.ximpleware.TranscodeException;
import com.ximpleware.VTDNav;
import java.io.IOException;
import java.io.OutputStream;
public class Transcoder {
/**
*
* @param input
* @param offset
* @param length
* @param input_encoding
* @param output_encoding
* @return
*
*/
public static byte[] transcode(byte[] input, int offset, int length,
int input_encoding, int output_encoding) throws TranscodeException {
//check input and output encoding
// calculate the length of the output byte array
int i = getOutLength(input, offset, length, input_encoding,
output_encoding);
// allocate the byte array
byte[] output = new byte[i];
// fill the byte array with output encoding
transcodeAndFill(input, output, offset, length, input_encoding,
output_encoding);
return output;
}
/**
*
* @param input
* @param offset
* @param length
* @param input_encoding
* @param output_encoding
* @return
* @throws TranscodeException
*
*/
public static final int getOutLength(byte[] input, int offset, int length,
int input_encoding, int output_encoding) throws TranscodeException {
int len = 0;
int k = offset;
int c;
while (k < offset + length) {
long l = decode(input, k, input_encoding);
k = (int) (l >>32);
c = (int) l;
len = len + getLen(c, output_encoding);
}
return len;
}
/**
* Fill the byte array with transcoded characters
*
* @param input
* @param output
* @param offset
* @param length
* @param input_encoding
* @param output_encoding
*
*/
public static final void transcodeAndFill(byte[] input, byte[] output,
int offset, int length, int input_encoding, int output_encoding)
throws TranscodeException {
//int len = 0;
int k = offset;
int c, i = 0;
while (k < offset + length) {
long l = decode(input, k, input_encoding);
k = (int) (l >> 32);
c = (int) l;
i = encode(output, i, c, output_encoding);
}
}
public static final int transcodeAndFill2(int initOutPosition,
byte[] input,
byte[] output,
int offset, int length, int input_encoding, int output_encoding)
throws TranscodeException {
//int len = 0;
int k = offset;
int c, i = initOutPosition;
while (k < offset + length) {
long l = decode(input, k, input_encoding);
k = (int) (l >> 32);
c = (int) l;
i = encode(output, i, c, output_encoding);
}
return i;
}
public static final void transcodeAndWrite(byte[] input,
java.io.OutputStream os,
int offset, int length, int input_encoding, int output_encoding)
throws TranscodeException,
IOException {
//int len = 0;
int k = offset;
int c;
while (k < offset + length) {
long l = decode(input, k, input_encoding);
k = (int) (l >> 32);
c = (int) l;
encodeAndWrite(os, c, output_encoding);
}
}
/**
*
* @param ch
* @param output_encoding
* @return
* @throws TranscodeException
*
*/
public static final int getLen(int ch, int output_encoding)
throws TranscodeException {
switch (output_encoding) {
case VTDNav.FORMAT_ASCII:
return ASCII_Coder.getLen(ch);
case VTDNav.FORMAT_UTF8:
return UTF8_Coder.getLen(ch);
case VTDNav.FORMAT_ISO_8859_1:
return ISO8859_1Coder.getLen(ch);
case VTDNav.FORMAT_UTF_16LE:
return UTF16LE_Coder.getLen(ch);
case VTDNav.FORMAT_UTF_16BE:
return UTF16BE_Coder.getLen(ch);
default:
throw new com.ximpleware.TranscodeException("Unsupported encoding");
}
}
/**
*
* @param input
* @param offset
* @param input_encoding
* @return
* @throws TranscodeException
*
*/
public static final long decode(byte[] input, int offset, int input_encoding)
throws TranscodeException {
switch (input_encoding) {
case VTDNav.FORMAT_ASCII:
return ASCII_Coder.decode(input, offset);
case VTDNav.FORMAT_UTF8:
return UTF8_Coder.decode(input, offset);
case VTDNav.FORMAT_ISO_8859_1:
return ISO8859_1Coder.decode(input, offset);
case VTDNav.FORMAT_UTF_16LE:
return UTF16LE_Coder.decode(input, offset);
case VTDNav.FORMAT_UTF_16BE:
return UTF16BE_Coder.decode(input, offset);
default:
throw new com.ximpleware.TranscodeException("Unsupported encoding");
}
}
/**
*
* @param output
* @param offset
* @param ch
* @param output_encoding
* @return
* @throws TranscodeException
*
*/
public static final int encode(byte[] output, int offset, int ch,
int output_encoding) throws TranscodeException {
switch (output_encoding) {
case VTDNav.FORMAT_ASCII:
return ASCII_Coder.encode(output, offset, ch);
case VTDNav.FORMAT_UTF8:
return UTF8_Coder.encode(output, offset, ch);
case VTDNav.FORMAT_ISO_8859_1:
return ISO8859_1Coder.encode(output, offset, ch);
case VTDNav.FORMAT_UTF_16LE:
return UTF16LE_Coder.encode(output, offset, ch);
case VTDNav.FORMAT_UTF_16BE:
return UTF16BE_Coder.encode(output, offset, ch);
default:
throw new com.ximpleware.TranscodeException("Unsupported encoding");
}
}
public static final void encodeAndWrite(OutputStream os, int ch,
int output_encoding) throws TranscodeException, IOException {
switch (output_encoding) {
case VTDNav.FORMAT_ASCII:
ASCII_Coder.encodeAndWrite(os, ch);
return;
case VTDNav.FORMAT_UTF8:
UTF8_Coder.encodeAndWrite(os, ch);
return;
case VTDNav.FORMAT_ISO_8859_1:
ISO8859_1Coder.encodeAndWrite(os, ch);
return;
case VTDNav.FORMAT_UTF_16LE:
UTF16LE_Coder.encodeAndWrite(os, ch);
return;
case VTDNav.FORMAT_UTF_16BE:
UTF16BE_Coder.encodeAndWrite(os, ch);
return;
default:
throw new com.ximpleware.TranscodeException("Unsupported encoding");
}
}
}
