1 /*

     2  * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 package java.net.http.internal.hpack;

    26 

    27 import java.io.IOException;

    28 import java.nio.ByteBuffer;

    29 

    30 //

    31 // Custom implementation of ISO/IEC 8859-1:1998

    32 //

    33 // The rationale behind this is not to deal with CharsetEncoder/CharsetDecoder,

    34 // basically because it would require wrapping every single CharSequence into a

    35 // CharBuffer and then copying it back.

    36 //

    37 // But why not to give a CharBuffer instead of Appendable? Because I can choose

    38 // an Appendable (e.g. StringBuilder) that adjusts its length when needed and

    39 // therefore not to deal with pre-sized CharBuffers or copying.

    40 //

    41 // The encoding is simple and well known: 1 byte <-> 1 char

    42 //

    43 final class ISO_8859_1 {

    44 

    45     private ISO_8859_1() { }

    46 

    47     public static final class Reader {

    48 

    49         public void read(ByteBuffer source, Appendable destination)

    50                 throws IOException {

    51             for (int i = 0, len = source.remaining(); i < len; i++) {

    52                 char c = (char) (source.get() & 0xff);

    53                 try {

    54                     destination.append(c);

    55                 } catch (IOException e) {

    56                     throw new IOException(

    57                             "Error appending to the destination", e);

    58                 }

    59             }

    60         }

    61 

    62         public Reader reset() {

    63             return this;

    64         }

    65     }

    66 

    67     public static final class Writer {

    68 

    69         private CharSequence source;

    70         private int pos;

    71         private int end;

    72 

    73         public Writer configure(CharSequence source, int start, int end) {

    74             this.source = source;

    75             this.pos = start;

    76             this.end = end;

    77             return this;

    78         }

    79 

    80         public boolean write(ByteBuffer destination) {

    81             for (; pos < end; pos++) {

    82                 char c = source.charAt(pos);

    83                 if (c > '\u00FF') {

    84                     throw new IllegalArgumentException(

    85                             "Illegal ISO-8859-1 char: " + (int) c);

    86                 }

    87                 if (destination.hasRemaining()) {

    88                     destination.put((byte) c);

    89                 } else {

    90                     return false;

    91                 }

    92             }

    93             return true;

    94         }

    95 

    96         public Writer reset() {

    97             source = null;

    98             pos = -1;

    99             end = -1;

   100             return this;

   101         }

   102     }

   103 }