1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/rt/emul/compact/src/main/java/java/io/InputStreamReader.java Tue Jan 17 07:04:06 2017 +0100
1.3 @@ -0,0 +1,230 @@
1.4 +/*
1.5 + * Copyright (c) 1996, 2005, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package java.io;
1.30 +
1.31 +
1.32 +/**
1.33 + * An InputStreamReader is a bridge from byte streams to character streams: It
1.34 + * reads bytes and decodes them into characters using a specified {@link
1.35 + * java.nio.charset.Charset <code>charset</code>}. The charset that it uses
1.36 + * may be specified by name or may be given explicitly, or the platform's
1.37 + * default charset may be accepted.
1.38 + *
1.39 + * <p> Each invocation of one of an InputStreamReader's read() methods may
1.40 + * cause one or more bytes to be read from the underlying byte-input stream.
1.41 + * To enable the efficient conversion of bytes to characters, more bytes may
1.42 + * be read ahead from the underlying stream than are necessary to satisfy the
1.43 + * current read operation.
1.44 + *
1.45 + * <p> For top efficiency, consider wrapping an InputStreamReader within a
1.46 + * BufferedReader. For example:
1.47 + *
1.48 + * <pre>
1.49 + * BufferedReader in
1.50 + * = new BufferedReader(new InputStreamReader(System.in));
1.51 + * </pre>
1.52 + *
1.53 + * @see BufferedReader
1.54 + * @see InputStream
1.55 + * @see java.nio.charset.Charset
1.56 + *
1.57 + * @author Mark Reinhold
1.58 + * @since JDK1.1
1.59 + */
1.60 +
1.61 +public class InputStreamReader extends Reader {
1.62 +
1.63 + /**
1.64 + * Creates an InputStreamReader that uses the default charset.
1.65 + *
1.66 + * @param in An InputStream
1.67 + */
1.68 + public InputStreamReader(InputStream in) {
1.69 + super(in);
1.70 + }
1.71 +
1.72 + /**
1.73 + * Creates an InputStreamReader that uses the named charset.
1.74 + *
1.75 + * @param in
1.76 + * An InputStream
1.77 + *
1.78 + * @param charsetName
1.79 + * The name of a supported
1.80 + * {@link java.nio.charset.Charset </code>charset<code>}
1.81 + *
1.82 + * @exception UnsupportedEncodingException
1.83 + * If the named charset is not supported
1.84 + */
1.85 + public InputStreamReader(InputStream in, String charsetName)
1.86 + throws UnsupportedEncodingException
1.87 + {
1.88 + super(in);
1.89 + if (!charsetName.toUpperCase().equals("UTF-8")) {
1.90 + throw new UnsupportedEncodingException(charsetName);
1.91 + }
1.92 + }
1.93 +
1.94 + /**
1.95 + * Creates an InputStreamReader that uses the given charset. </p>
1.96 + *
1.97 + * @param in An InputStream
1.98 + * @param cs A charset
1.99 + *
1.100 + * @since 1.4
1.101 + * @spec JSR-51
1.102 + */
1.103 +/* XXX:
1.104 + public InputStreamReader(InputStream in, Charset cs) {
1.105 + super(in);
1.106 + if (cs == null)
1.107 + throw new NullPointerException("charset");
1.108 + sd = StreamDecoder.forInputStreamReader(in, this, cs);
1.109 + }
1.110 +*/
1.111 + /**
1.112 + * Creates an InputStreamReader that uses the given charset decoder. </p>
1.113 + *
1.114 + * @param in An InputStream
1.115 + * @param dec A charset decoder
1.116 + *
1.117 + * @since 1.4
1.118 + * @spec JSR-51
1.119 + */
1.120 +/* XXX:
1.121 + public InputStreamReader(InputStream in, CharsetDecoder dec) {
1.122 + super(in);
1.123 + if (dec == null)
1.124 + throw new NullPointerException("charset decoder");
1.125 + sd = StreamDecoder.forInputStreamReader(in, this, dec);
1.126 + }
1.127 +*/
1.128 +
1.129 + /**
1.130 + * Returns the name of the character encoding being used by this stream.
1.131 + *
1.132 + * <p> If the encoding has an historical name then that name is returned;
1.133 + * otherwise the encoding's canonical name is returned.
1.134 + *
1.135 + * <p> If this instance was created with the {@link
1.136 + * #InputStreamReader(InputStream, String)} constructor then the returned
1.137 + * name, being unique for the encoding, may differ from the name passed to
1.138 + * the constructor. This method will return <code>null</code> if the
1.139 + * stream has been closed.
1.140 + * </p>
1.141 + * @return The historical name of this encoding, or
1.142 + * <code>null</code> if the stream has been closed
1.143 + *
1.144 + * @see java.nio.charset.Charset
1.145 + *
1.146 + * @revised 1.4
1.147 + * @spec JSR-51
1.148 + */
1.149 + public String getEncoding() {
1.150 + return "UTF-8";
1.151 + }
1.152 +
1.153 + /**
1.154 + * Reads a single character.
1.155 + *
1.156 + * @return The character read, or -1 if the end of the stream has been
1.157 + * reached
1.158 + *
1.159 + * @exception IOException If an I/O error occurs
1.160 + */
1.161 + public int read() throws IOException {
1.162 + final InputStream is = (InputStream)lock;
1.163 + int c = is.read();
1.164 + if (c == -1) {
1.165 + return -1;
1.166 + }
1.167 + c = (int) c & 0xff;
1.168 + switch (c >> 4) {
1.169 + case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
1.170 + /* 0xxxxxxx*/
1.171 + return c;
1.172 + case 12: case 13: {
1.173 + /* 110x xxxx 10xx xxxx*/
1.174 + int char2 = (int) is.read();
1.175 + if ((char2 & 0xC0) != 0x80)
1.176 + throw new UTFDataFormatException("malformed input");
1.177 + return (((c & 0x1F) << 6) | (char2 & 0x3F));
1.178 + }
1.179 + case 14: {
1.180 + /* 1110 xxxx 10xx xxxx 10xx xxxx */
1.181 + int char2 = is.read();
1.182 + int char3 = is.read();
1.183 + if (((char2 & 0xC0) != 0x80) || ((char3 & 0xC0) != 0x80))
1.184 + throw new UTFDataFormatException("malformed input");
1.185 + return (((c & 0x0F) << 12) |
1.186 + ((char2 & 0x3F) << 6) |
1.187 + ((char3 & 0x3F) << 0));
1.188 + }
1.189 + default:
1.190 + /* 10xx xxxx, 1111 xxxx */
1.191 + throw new UTFDataFormatException("malformed input");
1.192 + }
1.193 + }
1.194 +
1.195 + /**
1.196 + * Reads characters into a portion of an array.
1.197 + *
1.198 + * @param cbuf Destination buffer
1.199 + * @param offset Offset at which to start storing characters
1.200 + * @param length Maximum number of characters to read
1.201 + *
1.202 + * @return The number of characters read, or -1 if the end of the
1.203 + * stream has been reached
1.204 + *
1.205 + * @exception IOException If an I/O error occurs
1.206 + */
1.207 + public int read(char cbuf[], int offset, int length) throws IOException {
1.208 + for (int i = 0; i < length; i++) {
1.209 + int ch = read();
1.210 + if (ch == -1) {
1.211 + if (i == 0) return -1;
1.212 + return i;
1.213 + }
1.214 + cbuf[offset++] = (char) ch;
1.215 + }
1.216 + return length;
1.217 + }
1.218 +
1.219 + /**
1.220 + * Tells whether this stream is ready to be read. An InputStreamReader is
1.221 + * ready if its input buffer is not empty, or if bytes are available to be
1.222 + * read from the underlying byte stream.
1.223 + *
1.224 + * @exception IOException If an I/O error occurs
1.225 + */
1.226 + public boolean ready() throws IOException {
1.227 + return ((InputStream)lock).available() > 0;
1.228 + }
1.229 +
1.230 + public void close() throws IOException {
1.231 + ((InputStream)lock).close();
1.232 + }
1.233 +}