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| 1 | /* | ||
| 2 | * Copyright (c) 1995, 2004, 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 | |||
| 26 | package java.io; | ||
| 27 | |||
| 28 | /** | ||
| 29 | * This class allows an application to create an input stream in | ||
| 30 | * which the bytes read are supplied by the contents of a string. | ||
| 31 | * Applications can also read bytes from a byte array by using a | ||
| 32 | * <code>ByteArrayInputStream</code>. | ||
| 33 | * <p> | ||
| 34 | * Only the low eight bits of each character in the string are used by | ||
| 35 | * this class. | ||
| 36 | * | ||
| 37 | * @author Arthur van Hoff | ||
| 38 | * @see java.io.ByteArrayInputStream | ||
| 39 | * @see java.io.StringReader | ||
| 40 | * @since JDK1.0 | ||
| 41 | * @deprecated This class does not properly convert characters into bytes. As | ||
| 42 | * of JDK 1.1, the preferred way to create a stream from a | ||
| 43 | * string is via the <code>StringReader</code> class. | ||
| 44 | */ | ||
| 45 | @Deprecated | ||
| 46 | public | ||
| 47 | class StringBufferInputStream extends InputStream { | ||
| 48 | /** | ||
| 49 | * The string from which bytes are read. | ||
| 50 | */ | ||
| 51 | protected String buffer; | ||
| 52 | |||
| 53 | /** | ||
| 54 | * The index of the next character to read from the input stream buffer. | ||
| 55 | * | ||
| 56 | * @see java.io.StringBufferInputStream#buffer | ||
| 57 | */ | ||
| 58 | protected int pos; | ||
| 59 | |||
| 60 | /** | ||
| 61 | * The number of valid characters in the input stream buffer. | ||
| 62 | * | ||
| 63 | * @see java.io.StringBufferInputStream#buffer | ||
| 64 | */ | ||
| 65 | protected int count; | ||
| 66 | |||
| 67 | /** | ||
| 68 | * Creates a string input stream to read data from the specified string. | ||
| 69 | * | ||
| 70 | * @param s the underlying input buffer. | ||
| 71 | */ | ||
| 72 | public StringBufferInputStream(String s) { | ||
| 73 | this.buffer = s; | ||
| 74 | count = s.length(); | ||
| 75 | } | ||
| 76 | |||
| 77 | /** | ||
| 78 | * Reads the next byte of data from this input stream. The value | ||
| 79 | * byte is returned as an <code>int</code> in the range | ||
| 80 | * <code>0</code> to <code>255</code>. If no byte is available | ||
| 81 | * because the end of the stream has been reached, the value | ||
| 82 | * <code>-1</code> is returned. | ||
| 83 | * <p> | ||
| 84 | * The <code>read</code> method of | ||
| 85 | * <code>StringBufferInputStream</code> cannot block. It returns the | ||
| 86 | * low eight bits of the next character in this input stream's buffer. | ||
| 87 | * | ||
| 88 | * @return the next byte of data, or <code>-1</code> if the end of the | ||
| 89 | * stream is reached. | ||
| 90 | */ | ||
| 91 | public synchronized int read() { | ||
| 92 | return (pos < count) ? (buffer.charAt(pos++) & 0xFF) : -1; | ||
| 93 | } | ||
| 94 | |||
| 95 | /** | ||
| 96 | * Reads up to <code>len</code> bytes of data from this input stream | ||
| 97 | * into an array of bytes. | ||
| 98 | * <p> | ||
| 99 | * The <code>read</code> method of | ||
| 100 | * <code>StringBufferInputStream</code> cannot block. It copies the | ||
| 101 | * low eight bits from the characters in this input stream's buffer into | ||
| 102 | * the byte array argument. | ||
| 103 | * | ||
| 104 | * @param b the buffer into which the data is read. | ||
| 105 | * @param off the start offset of the data. | ||
| 106 | * @param len the maximum number of bytes read. | ||
| 107 | * @return the total number of bytes read into the buffer, or | ||
| 108 | * <code>-1</code> if there is no more data because the end of | ||
| 109 | * the stream has been reached. | ||
| 110 | */ | ||
| 111 | public synchronized int read(byte b[], int off, int len) { | ||
| 112 | if (b == null) { | ||
| 113 | throw new NullPointerException(); | ||
| 114 | } else if ((off < 0) || (off > b.length) || (len < 0) || | ||
| 115 | ((off + len) > b.length) || ((off + len) < 0)) { | ||
| 116 | throw new IndexOutOfBoundsException(); | ||
| 117 | } | ||
| 118 | if (pos >= count) { | ||
| 119 | return -1; | ||
| 120 | } | ||
| 121 | if (pos + len > count) { | ||
| 122 | len = count - pos; | ||
| 123 | } | ||
| 124 | if (len <= 0) { | ||
| 125 | return 0; | ||
| 126 | } | ||
| 127 | String s = buffer; | ||
| 128 | int cnt = len; | ||
| 129 | while (--cnt >= 0) { | ||
| 130 | b[off++] = (byte)s.charAt(pos++); | ||
| 131 | } | ||
| 132 | |||
| 133 | return len; | ||
| 134 | } | ||
| 135 | |||
| 136 | /** | ||
| 137 | * Skips <code>n</code> bytes of input from this input stream. Fewer | ||
| 138 | * bytes might be skipped if the end of the input stream is reached. | ||
| 139 | * | ||
| 140 | * @param n the number of bytes to be skipped. | ||
| 141 | * @return the actual number of bytes skipped. | ||
| 142 | */ | ||
| 143 | public synchronized long skip(long n) { | ||
| 144 | if (n < 0) { | ||
| 145 | return 0; | ||
| 146 | } | ||
| 147 | if (n > count - pos) { | ||
| 148 | n = count - pos; | ||
| 149 | } | ||
| 150 | pos += n; | ||
| 151 | return n; | ||
| 152 | } | ||
| 153 | |||
| 154 | /** | ||
| 155 | * Returns the number of bytes that can be read from the input | ||
| 156 | * stream without blocking. | ||
| 157 | * | ||
| 158 | * @return the value of <code>count - pos</code>, which is the | ||
| 159 | * number of bytes remaining to be read from the input buffer. | ||
| 160 | */ | ||
| 161 | public synchronized int available() { | ||
| 162 | return count - pos; | ||
| 163 | } | ||
| 164 | |||
| 165 | /** | ||
| 166 | * Resets the input stream to begin reading from the first character | ||
| 167 | * of this input stream's underlying buffer. | ||
| 168 | */ | ||
| 169 | public synchronized void reset() { | ||
| 170 | pos = 0; | ||
| 171 | } | ||
| 172 | } | ||