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/* * @(#)StringBufferInputStream.java 1.27 05/11/17 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.io; /** * This class allows an application to create an input stream in * which the bytes read are supplied by the contents of a string. * Applications can also read bytes from a byte array by using a * <code>ByteArrayInputStream</code>. * <p> * Only the low eight bits of each character in the string are used by * this class. * * @author Arthur van Hoff * @version 1.27, 11/17/05 * @see java.io.ByteArrayInputStream * @see java.io.StringReader * @since JDK1.0 * @deprecated This class does not properly convert characters into bytes. As * of JDK 1.1, the preferred way to create a stream from a * string is via the <code>StringReader</code> class. */ @Deprecated public class StringBufferInputStream extends InputStream { /** * The string from which bytes are read. */ protected String buffer; /** * The index of the next character to read from the input stream buffer. * * @see java.io.StringBufferInputStream#buffer */ protected int pos; /** * The number of valid characters in the input stream buffer. * * @see java.io.StringBufferInputStream#buffer */ protected int count; /** * Creates a string input stream to read data from the specified string. * * @param s the underlying input buffer. */ public StringBufferInputStream(String s) { this.buffer = s; count = s.length(); } /** * Reads the next byte of data from this input stream. The value * byte is returned as an <code>int</code> in the range * <code>0</code> to <code>255</code>. If no byte is available * because the end of the stream has been reached, the value * <code>-1</code> is returned. * <p> * The <code>read</code> method of * <code>StringBufferInputStream</code> cannot block. It returns the * low eight bits of the next character in this input stream's buffer. * * @return the next byte of data, or <code>-1</code> if the end of the * stream is reached. */ public synchronized int read() { return (pos < count) ? (buffer.charAt(pos++) & 0xFF) : -1; } /** * Reads up to <code>len</code> bytes of data from this input stream * into an array of bytes. * <p> * The <code>read</code> method of * <code>StringBufferInputStream</code> cannot block. It copies the * low eight bits from the characters in this input stream's buffer into * the byte array argument. * * @param b the buffer into which the data is read. * @param off the start offset of the data. * @param len the maximum number of bytes read. * @return the total number of bytes read into the buffer, or * <code>-1</code> if there is no more data because the end of * the stream has been reached. */ public synchronized int read(byte b[], int off, int len) { if (b == null) { throw new NullPointerException(); } else if ((off < 0) || (off > b.length) || (len < 0) || ((off + len) > b.length) || ((off + len) < 0)) { throw new IndexOutOfBoundsException(); } if (pos >= count) { return -1; } if (pos + len > count) { len = count - pos; } if (len <= 0) { return 0; } String s = buffer; int cnt = len; while (--cnt >= 0) { b[off++] = (byte)s.charAt(pos++); } return len; } /** * Skips <code>n</code> bytes of input from this input stream. Fewer * bytes might be skipped if the end of the input stream is reached. * * @param n the number of bytes to be skipped. * @return the actual number of bytes skipped. */ public synchronized long skip(long n) { if (n < 0) { return 0; } if (n > count - pos) { n = count - pos; } pos += n; return n; } /** * Returns the number of bytes that can be read from the input * stream without blocking. * * @return the value of <code>count - pos</code>, which is the * number of bytes remaining to be read from the input buffer. */ public synchronized int available() { return count - pos; } /** * Resets the input stream to begin reading from the first character * of this input stream's underlying buffer. */ public synchronized void reset() { pos = 0; } }