1.1 --- a/emul/src/main/java/java/io/ByteArrayInputStream.java Wed Jan 23 20:16:48 2013 +0100
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,283 +0,0 @@
1.4 -/*
1.5 - * Copyright (c) 1994, 2010, 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 - * A <code>ByteArrayInputStream</code> contains
1.33 - * an internal buffer that contains bytes that
1.34 - * may be read from the stream. An internal
1.35 - * counter keeps track of the next byte to
1.36 - * be supplied by the <code>read</code> method.
1.37 - * <p>
1.38 - * Closing a <tt>ByteArrayInputStream</tt> has no effect. The methods in
1.39 - * this class can be called after the stream has been closed without
1.40 - * generating an <tt>IOException</tt>.
1.41 - *
1.42 - * @author Arthur van Hoff
1.43 - * @see java.io.StringBufferInputStream
1.44 - * @since JDK1.0
1.45 - */
1.46 -public
1.47 -class ByteArrayInputStream extends InputStream {
1.48 -
1.49 - /**
1.50 - * An array of bytes that was provided
1.51 - * by the creator of the stream. Elements <code>buf[0]</code>
1.52 - * through <code>buf[count-1]</code> are the
1.53 - * only bytes that can ever be read from the
1.54 - * stream; element <code>buf[pos]</code> is
1.55 - * the next byte to be read.
1.56 - */
1.57 - protected byte buf[];
1.58 -
1.59 - /**
1.60 - * The index of the next character to read from the input stream buffer.
1.61 - * This value should always be nonnegative
1.62 - * and not larger than the value of <code>count</code>.
1.63 - * The next byte to be read from the input stream buffer
1.64 - * will be <code>buf[pos]</code>.
1.65 - */
1.66 - protected int pos;
1.67 -
1.68 - /**
1.69 - * The currently marked position in the stream.
1.70 - * ByteArrayInputStream objects are marked at position zero by
1.71 - * default when constructed. They may be marked at another
1.72 - * position within the buffer by the <code>mark()</code> method.
1.73 - * The current buffer position is set to this point by the
1.74 - * <code>reset()</code> method.
1.75 - * <p>
1.76 - * If no mark has been set, then the value of mark is the offset
1.77 - * passed to the constructor (or 0 if the offset was not supplied).
1.78 - *
1.79 - * @since JDK1.1
1.80 - */
1.81 - protected int mark = 0;
1.82 -
1.83 - /**
1.84 - * The index one greater than the last valid character in the input
1.85 - * stream buffer.
1.86 - * This value should always be nonnegative
1.87 - * and not larger than the length of <code>buf</code>.
1.88 - * It is one greater than the position of
1.89 - * the last byte within <code>buf</code> that
1.90 - * can ever be read from the input stream buffer.
1.91 - */
1.92 - protected int count;
1.93 -
1.94 - /**
1.95 - * Creates a <code>ByteArrayInputStream</code>
1.96 - * so that it uses <code>buf</code> as its
1.97 - * buffer array.
1.98 - * The buffer array is not copied.
1.99 - * The initial value of <code>pos</code>
1.100 - * is <code>0</code> and the initial value
1.101 - * of <code>count</code> is the length of
1.102 - * <code>buf</code>.
1.103 - *
1.104 - * @param buf the input buffer.
1.105 - */
1.106 - public ByteArrayInputStream(byte buf[]) {
1.107 - this.buf = buf;
1.108 - this.pos = 0;
1.109 - this.count = buf.length;
1.110 - }
1.111 -
1.112 - /**
1.113 - * Creates <code>ByteArrayInputStream</code>
1.114 - * that uses <code>buf</code> as its
1.115 - * buffer array. The initial value of <code>pos</code>
1.116 - * is <code>offset</code> and the initial value
1.117 - * of <code>count</code> is the minimum of <code>offset+length</code>
1.118 - * and <code>buf.length</code>.
1.119 - * The buffer array is not copied. The buffer's mark is
1.120 - * set to the specified offset.
1.121 - *
1.122 - * @param buf the input buffer.
1.123 - * @param offset the offset in the buffer of the first byte to read.
1.124 - * @param length the maximum number of bytes to read from the buffer.
1.125 - */
1.126 - public ByteArrayInputStream(byte buf[], int offset, int length) {
1.127 - this.buf = buf;
1.128 - this.pos = offset;
1.129 - this.count = Math.min(offset + length, buf.length);
1.130 - this.mark = offset;
1.131 - }
1.132 -
1.133 - /**
1.134 - * Reads the next byte of data from this input stream. The value
1.135 - * byte is returned as an <code>int</code> in the range
1.136 - * <code>0</code> to <code>255</code>. If no byte is available
1.137 - * because the end of the stream has been reached, the value
1.138 - * <code>-1</code> is returned.
1.139 - * <p>
1.140 - * This <code>read</code> method
1.141 - * cannot block.
1.142 - *
1.143 - * @return the next byte of data, or <code>-1</code> if the end of the
1.144 - * stream has been reached.
1.145 - */
1.146 - public synchronized int read() {
1.147 - return (pos < count) ? (buf[pos++] & 0xff) : -1;
1.148 - }
1.149 -
1.150 - /**
1.151 - * Reads up to <code>len</code> bytes of data into an array of bytes
1.152 - * from this input stream.
1.153 - * If <code>pos</code> equals <code>count</code>,
1.154 - * then <code>-1</code> is returned to indicate
1.155 - * end of file. Otherwise, the number <code>k</code>
1.156 - * of bytes read is equal to the smaller of
1.157 - * <code>len</code> and <code>count-pos</code>.
1.158 - * If <code>k</code> is positive, then bytes
1.159 - * <code>buf[pos]</code> through <code>buf[pos+k-1]</code>
1.160 - * are copied into <code>b[off]</code> through
1.161 - * <code>b[off+k-1]</code> in the manner performed
1.162 - * by <code>System.arraycopy</code>. The
1.163 - * value <code>k</code> is added into <code>pos</code>
1.164 - * and <code>k</code> is returned.
1.165 - * <p>
1.166 - * This <code>read</code> method cannot block.
1.167 - *
1.168 - * @param b the buffer into which the data is read.
1.169 - * @param off the start offset in the destination array <code>b</code>
1.170 - * @param len the maximum number of bytes read.
1.171 - * @return the total number of bytes read into the buffer, or
1.172 - * <code>-1</code> if there is no more data because the end of
1.173 - * the stream has been reached.
1.174 - * @exception NullPointerException If <code>b</code> is <code>null</code>.
1.175 - * @exception IndexOutOfBoundsException If <code>off</code> is negative,
1.176 - * <code>len</code> is negative, or <code>len</code> is greater than
1.177 - * <code>b.length - off</code>
1.178 - */
1.179 - public synchronized int read(byte b[], int off, int len) {
1.180 - if (b == null) {
1.181 - throw new NullPointerException();
1.182 - } else if (off < 0 || len < 0 || len > b.length - off) {
1.183 - throw new IndexOutOfBoundsException();
1.184 - }
1.185 -
1.186 - if (pos >= count) {
1.187 - return -1;
1.188 - }
1.189 -
1.190 - int avail = count - pos;
1.191 - if (len > avail) {
1.192 - len = avail;
1.193 - }
1.194 - if (len <= 0) {
1.195 - return 0;
1.196 - }
1.197 - PushbackInputStream.arraycopy(buf, pos, b, off, len);
1.198 - pos += len;
1.199 - return len;
1.200 - }
1.201 -
1.202 - /**
1.203 - * Skips <code>n</code> bytes of input from this input stream. Fewer
1.204 - * bytes might be skipped if the end of the input stream is reached.
1.205 - * The actual number <code>k</code>
1.206 - * of bytes to be skipped is equal to the smaller
1.207 - * of <code>n</code> and <code>count-pos</code>.
1.208 - * The value <code>k</code> is added into <code>pos</code>
1.209 - * and <code>k</code> is returned.
1.210 - *
1.211 - * @param n the number of bytes to be skipped.
1.212 - * @return the actual number of bytes skipped.
1.213 - */
1.214 - public synchronized long skip(long n) {
1.215 - long k = count - pos;
1.216 - if (n < k) {
1.217 - k = n < 0 ? 0 : n;
1.218 - }
1.219 -
1.220 - pos += k;
1.221 - return k;
1.222 - }
1.223 -
1.224 - /**
1.225 - * Returns the number of remaining bytes that can be read (or skipped over)
1.226 - * from this input stream.
1.227 - * <p>
1.228 - * The value returned is <code>count - pos</code>,
1.229 - * which is the number of bytes remaining to be read from the input buffer.
1.230 - *
1.231 - * @return the number of remaining bytes that can be read (or skipped
1.232 - * over) from this input stream without blocking.
1.233 - */
1.234 - public synchronized int available() {
1.235 - return count - pos;
1.236 - }
1.237 -
1.238 - /**
1.239 - * Tests if this <code>InputStream</code> supports mark/reset. The
1.240 - * <code>markSupported</code> method of <code>ByteArrayInputStream</code>
1.241 - * always returns <code>true</code>.
1.242 - *
1.243 - * @since JDK1.1
1.244 - */
1.245 - public boolean markSupported() {
1.246 - return true;
1.247 - }
1.248 -
1.249 - /**
1.250 - * Set the current marked position in the stream.
1.251 - * ByteArrayInputStream objects are marked at position zero by
1.252 - * default when constructed. They may be marked at another
1.253 - * position within the buffer by this method.
1.254 - * <p>
1.255 - * If no mark has been set, then the value of the mark is the
1.256 - * offset passed to the constructor (or 0 if the offset was not
1.257 - * supplied).
1.258 - *
1.259 - * <p> Note: The <code>readAheadLimit</code> for this class
1.260 - * has no meaning.
1.261 - *
1.262 - * @since JDK1.1
1.263 - */
1.264 - public void mark(int readAheadLimit) {
1.265 - mark = pos;
1.266 - }
1.267 -
1.268 - /**
1.269 - * Resets the buffer to the marked position. The marked position
1.270 - * is 0 unless another position was marked or an offset was specified
1.271 - * in the constructor.
1.272 - */
1.273 - public synchronized void reset() {
1.274 - pos = mark;
1.275 - }
1.276 -
1.277 - /**
1.278 - * Closing a <tt>ByteArrayInputStream</tt> has no effect. The methods in
1.279 - * this class can be called after the stream has been closed without
1.280 - * generating an <tt>IOException</tt>.
1.281 - * <p>
1.282 - */
1.283 - public void close() throws IOException {
1.284 - }
1.285 -
1.286 -}