+++ /dev/null
-/* Copyright (C) 1999, 2000, 2001 Free Software Foundation
-
- 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 UnicodeToBytes extends IOConverter
-{
- /** Buffer to emit bytes to.
- * The locations buf[count] ... buf[buf.length-1] are available. */
- public byte[] buf;
- public int count;
-
- // The name of the default encoding.
- static String defaultEncoding;
-
- /* These keep a small cache of encoders for reuse. The array holds
- the actual encoders. The currCachePos is the next value we are
- going to replace in the cache. We don't just throw the data away
- if the cache is full, because if the cache filled up with stuff we
- don't need then the cache would be worthless. We instead
- circulate through the cache the implement kind of an LRU
- algorithm. */
- private static final int CACHE_SIZE = 4; // A power of 2 for speed
- private static UnicodeToBytes[] encoderCache
- = new UnicodeToBytes[CACHE_SIZE];
- private static int currCachePos = 0;
-
- public abstract String getName();
-
- public static UnicodeToBytes getDefaultEncoder()
- {
- try
- {
- synchronized (UnicodeToBytes.class)
- {
- if (defaultEncoding == null)
- {
- String encoding
- = canonicalize (System.getProperty("file.encoding",
- "8859_1"));
- String className = "gnu.gcj.convert.Output_" + encoding;
- try
- {
- Class defaultEncodingClass = Class.forName(className);
- defaultEncoding = encoding;
- }
- catch (ClassNotFoundException ex)
- {
- throw new NoClassDefFoundError("missing default encoding "
- + encoding + " (class "
- + className
- + " not found)");
- }
- }
- }
-
- return getEncoder (defaultEncoding);
- }
- catch (Throwable ex)
- {
- return new Output_8859_1();
- }
- }
-
- /** Get a char-stream->byte-stream converter given an encoding name. */
- public static UnicodeToBytes getEncoder (String encoding)
- throws java.io.UnsupportedEncodingException
- {
- /* First hunt in our cache to see if we have a encoder that is
- already allocated. */
- synchronized (UnicodeToBytes.class)
- {
- int i;
- for (i = 0; i < encoderCache.length; ++i)
- {
- if (encoderCache[i] != null
- && encoding.equals(encoderCache[i].getName ()))
- {
- UnicodeToBytes rv = encoderCache[i];
- encoderCache[i] = null;
- return rv;
- }
- }
- }
-
- String className = "gnu.gcj.convert.Output_" + canonicalize (encoding);
- Class encodingClass;
- try
- {
- encodingClass = Class.forName(className);
- return (UnicodeToBytes) encodingClass.newInstance();
- }
- catch (Throwable ex)
- {
- try
- {
- // We pass the original name to iconv and let it handle
- // its own aliasing.
- return new Output_iconv (encoding);
- }
- catch (Throwable _)
- {
- // Put the original exception in the throwable.
- throw new java.io.UnsupportedEncodingException(encoding + " ("
- + ex + ')');
- }
- }
- }
-
- public final void setOutput(byte[] buffer, int count)
- {
- this.buf = buffer;
- this.count = count;
- }
-
- /** Convert chars to bytes.
- * Converted bytes are written to buf, starting at count.
- * @param inbuffer source of characters to convert
- * @param inpos index of initial character in inbuffer to convert
- * @param inlength number of characters to convert
- * @return number of chars converted
- * Also, this.count is increment by the number of bytes converted.
- */
- public abstract int write (char[] inbuffer, int inpos, int inlength);
-
- /** Convert chars to bytes.
- * Converted bytes are written to buf, starting at count.
- * @param str source of characters to convert
- * @param inpos index of initial character in str to convert
- * @param inlength number of characters to convert
- * @param work if non-null, a buffer than can be used
- * @return number of chars converted
- * Also, this.count is increment by the number of bytes converted.
- */
- public int write (String str, int inpos, int inlength, char[] work)
- {
- if (work == null)
- work = new char[inlength];
- int srcEnd = inpos + (inlength > work.length ? work.length : inlength);
- str.getChars(inpos, srcEnd, work, 0);
- return write(work, 0, srcEnd - inpos);
- }
-
- /** Indicate that the converter is resuable.
- * This class keeps track of converters on a per-encoding basis.
- * When done with an encoder you may call this method to indicate
- * that it can be reused later.
- */
- public void done ()
- {
- synchronized (UnicodeToBytes.class)
- {
- this.buf = null;
- this.count = 0;
-
- encoderCache[currCachePos] = this;
- currCachePos = (currCachePos + 1) % CACHE_SIZE;
- }
- }
-}
projects / msp430-gcc.git / blobdiff