106 lines
3.2 KiB
Java
106 lines
3.2 KiB
Java
/* Copyright (C) 1999 Cygnus Solutions
|
|
|
|
This file is part of libgcj.
|
|
|
|
This software is copyrighted work licensed under the terms of the
|
|
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
|
|
details. */
|
|
|
|
package gnu.gcj.convert;
|
|
|
|
public abstract class BytesToUnicode
|
|
{
|
|
/** Buffer to read bytes from.
|
|
* The characters inbuffer[inpos] ... inbuffer[inlength-1] are available. */
|
|
public byte[] inbuffer;
|
|
/** Starting index in buffer to read bytes from. */
|
|
public int inpos;
|
|
/** End of valid bytes in buffer. */
|
|
public int inlength;
|
|
|
|
static Class defaultDecodingClass;
|
|
|
|
static synchronized void getDefaultDecodingClass()
|
|
{
|
|
// Test (defaultDecodingClass == null) again in case of race condition.
|
|
if (defaultDecodingClass == null)
|
|
{
|
|
String encoding = System.getProperty("file.encoding");
|
|
String className = "gnu.gcj.convert.Input_"+encoding;
|
|
try
|
|
{
|
|
defaultDecodingClass = Class.forName(className);
|
|
}
|
|
catch (ClassNotFoundException ex)
|
|
{
|
|
throw new NoClassDefFoundError("missing default encoding "
|
|
+ encoding + " (class "
|
|
+ className + " not found)");
|
|
}
|
|
}
|
|
}
|
|
|
|
public abstract String getName();
|
|
|
|
public static BytesToUnicode getDefaultDecoder()
|
|
{
|
|
try
|
|
{
|
|
if (defaultDecodingClass == null)
|
|
getDefaultDecodingClass();
|
|
return (BytesToUnicode) defaultDecodingClass.newInstance();
|
|
}
|
|
catch (Throwable ex)
|
|
{
|
|
return new Input_8859_1();
|
|
}
|
|
}
|
|
|
|
/** Get a byte-stream->char-stream converter given an encoding name. */
|
|
public static BytesToUnicode getDecoder (String encoding)
|
|
throws java.io.UnsupportedEncodingException
|
|
{
|
|
String className = "gnu.gcj.convert.Input_"+encoding;
|
|
Class decodingClass;
|
|
try
|
|
{
|
|
decodingClass = Class.forName(className);
|
|
return (BytesToUnicode) decodingClass.newInstance();
|
|
}
|
|
catch (Throwable ex)
|
|
{
|
|
throw new java.io.UnsupportedEncodingException(encoding
|
|
+ " (" + ex + ')');
|
|
}
|
|
}
|
|
|
|
/** Make input bytes available to the conversion.
|
|
* @param buffer source of input bytes
|
|
* @param pos index of first available byte
|
|
* @param length one more than index of last available byte
|
|
*/
|
|
public final void setInput(byte[] buffer, int pos, int length)
|
|
{
|
|
inbuffer = buffer;
|
|
inpos = pos;
|
|
inlength = length;
|
|
}
|
|
|
|
/** Convert bytes to chars.
|
|
* Input bytes are taken from this.inbuffer. The available input
|
|
* bytes start at inbuffer[inpos], and end at inbuffer[inlength-1].
|
|
* @param outbuffer buffer for the converted character
|
|
* @param outpos position in buffer to start putting converted characters
|
|
* @param outlength the maximum number of characters to read
|
|
* @return number of chars placed in outbuffer.
|
|
* Also, this.inpos is incremented by the number of bytes consumed.
|
|
*
|
|
* (Note the asymmetry in that the input upper bound is inbuffer[inlength-1],
|
|
* while the output upper bound is outbuffer[outpos+outlength-1]. The
|
|
* justification is that inlength is like the count field of a
|
|
* BufferedInputStream, while the outlength parameter is like the
|
|
* length parameter of a read request.)
|
|
*/
|
|
public abstract int read (char[] outbuffer, int outpos, int outlength);
|
|
}
|