encodings.pl: Added `ASCII' alias.

* scripts/encodings.pl: Added `ASCII' alias.
	* Makefile.in: Rebuilt.
	* Makefile.am (convert_source_files): Added new files.
	* gnu/gcj/convert/Input_ASCII.java: New file.
	* gnu/gcj/convert/Output_ASCII.java: New file.
	* gnu/gcj/convert/Output_8859_1.java (write): Use `?' to represent
	out-of-range characters.
	* gnu/gcj/convert/natIconv.cc (iconv_init): New method.
	(read): Swap bytes if required.  Treat `count' as character count,
	not byte count.
	(write): Likewise.  Also, handle case where iconv fails on a given
	character.
	(init): Put encoding into exception.
	* gnu/gcj/convert/IOConverter.java (iconv_byte_swap): New global.
	(static): Call iconv_init.  Rebuilt alias list.
	(iconv_init): New private method.

From-SVN: r37190

libjava/gnu/gcj/convert/Input_ASCII.java

@@ -0,0 +1,37 @@
+/* Copyright (C) 2000  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;
+
+/**
+ * Convert ASCII text to Unicode.
+ * @date October 2000
+ */
+
+public class Input_ASCII extends BytesToUnicode
+{
+  public String getName() { return "ASCII"; }
+
+  public int read (char[] outbuffer, int outpos, int count)
+  {
+    int origpos = outpos;
+    // Make sure fields of this are in registers.
+    int inpos = this.inpos;
+    byte[] inbuffer = this.inbuffer;
+    int inavail = this.inlength - inpos;
+    int outavail = count;
+    if (outavail > inavail)
+      outavail = inavail;
+    while (--outavail >= 0)
+      {
+	outbuffer[outpos++] = (char) (inbuffer[inpos++] & 0x7f);
+      }
+    this.inpos = inpos;
+    return outpos - origpos;
+  }
+}