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annotate src/goodjava/io/BufferedInputStream.java @ 1478:37e582f2e266

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clone BufferedInputStream
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 24 Apr 2020 10:45:53 -0600
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children bd13aaeaf6d4
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1 /*
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2 * Copyright (c) 1994, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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4 *
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5 *
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6 *
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7 *
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8 *
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9 *
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10 *
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11 *
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12 *
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13 *
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14 *
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15 *
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16 *
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17 *
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18 *
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19 *
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20 *
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21 *
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22 *
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23 *
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24 */
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25
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26 package goodjava.io;
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27
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28 import java.io.InputStream;
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29 import java.io.FilterInputStream;
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30 import java.io.IOException;
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31 import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
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32
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33 /**
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34 * A <code>BufferedInputStream</code> adds
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35 * functionality to another input stream-namely,
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36 * the ability to buffer the input and to
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37 * support the <code>mark</code> and <code>reset</code>
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38 * methods. When the <code>BufferedInputStream</code>
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39 * is created, an internal buffer array is
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40 * created. As bytes from the stream are read
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41 * or skipped, the internal buffer is refilled
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42 * as necessary from the contained input stream,
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43 * many bytes at a time. The <code>mark</code>
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44 * operation remembers a point in the input
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45 * stream and the <code>reset</code> operation
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46 * causes all the bytes read since the most
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47 * recent <code>mark</code> operation to be
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48 * reread before new bytes are taken from
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49 * the contained input stream.
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50 *
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51 * @author Arthur van Hoff
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52 * @since JDK1.0
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53 */
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54 public
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55 class BufferedInputStream extends FilterInputStream {
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56
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57 private static int DEFAULT_BUFFER_SIZE = 8192;
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58
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59 /**
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60 * The maximum size of array to allocate.
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61 * Some VMs reserve some header words in an array.
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62 * Attempts to allocate larger arrays may result in
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63 * OutOfMemoryError: Requested array size exceeds VM limit
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64 */
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65 private static int MAX_BUFFER_SIZE = Integer.MAX_VALUE - 8;
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66
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67 /**
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68 * The internal buffer array where the data is stored. When necessary,
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69 * it may be replaced by another array of
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70 * a different size.
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71 */
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72 protected volatile byte buf[];
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73
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74 /**
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75 * Atomic updater to provide compareAndSet for buf. This is
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76 * necessary because closes can be asynchronous. We use nullness
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77 * of buf[] as primary indicator that this stream is closed. (The
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78 * "in" field is also nulled out on close.)
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79 */
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80 private static final
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81 AtomicReferenceFieldUpdater<BufferedInputStream, byte[]> bufUpdater =
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82 AtomicReferenceFieldUpdater.newUpdater
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83 (BufferedInputStream.class, byte[].class, "buf");
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84
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85 /**
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86 * The index one greater than the index of the last valid byte in
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87 * the buffer.
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88 * This value is always
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89 * in the range <code>0</code> through <code>buf.length</code>;
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90 * elements <code>buf[0]</code> through <code>buf[count-1]
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91 * </code>contain buffered input data obtained
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92 * from the underlying input stream.
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93 */
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94 protected int count;
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95
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96 /**
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97 * The current position in the buffer. This is the index of the next
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98 * character to be read from the <code>buf</code> array.
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99 * <p>
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100 * This value is always in the range <code>0</code>
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101 * through <code>count</code>. If it is less
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102 * than <code>count</code>, then <code>buf[pos]</code>
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103 * is the next byte to be supplied as input;
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104 * if it is equal to <code>count</code>, then
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105 * the next <code>read</code> or <code>skip</code>
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106 * operation will require more bytes to be
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107 * read from the contained input stream.
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108 *
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109 * @see java.io.BufferedInputStream#buf
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110 */
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111 protected int pos;
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112
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113 /**
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114 * The value of the <code>pos</code> field at the time the last
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115 * <code>mark</code> method was called.
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116 * <p>
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117 * This value is always
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118 * in the range <code>-1</code> through <code>pos</code>.
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119 * If there is no marked position in the input
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120 * stream, this field is <code>-1</code>. If
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121 * there is a marked position in the input
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122 * stream, then <code>buf[markpos]</code>
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123 * is the first byte to be supplied as input
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124 * after a <code>reset</code> operation. If
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125 * <code>markpos</code> is not <code>-1</code>,
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126 * then all bytes from positions <code>buf[markpos]</code>
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127 * through <code>buf[pos-1]</code> must remain
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128 * in the buffer array (though they may be
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129 * moved to another place in the buffer array,
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130 * with suitable adjustments to the values
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131 * of <code>count</code>, <code>pos</code>,
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132 * and <code>markpos</code>); they may not
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133 * be discarded unless and until the difference
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134 * between <code>pos</code> and <code>markpos</code>
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135 * exceeds <code>marklimit</code>.
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136 *
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137 * @see java.io.BufferedInputStream#mark(int)
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138 * @see java.io.BufferedInputStream#pos
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139 */
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140 protected int markpos = -1;
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141
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142 /**
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143 * The maximum read ahead allowed after a call to the
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144 * <code>mark</code> method before subsequent calls to the
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145 * <code>reset</code> method fail.
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146 * Whenever the difference between <code>pos</code>
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147 * and <code>markpos</code> exceeds <code>marklimit</code>,
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148 * then the mark may be dropped by setting
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149 * <code>markpos</code> to <code>-1</code>.
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150 *
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151 * @see java.io.BufferedInputStream#mark(int)
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152 * @see java.io.BufferedInputStream#reset()
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153 */
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154 protected int marklimit;
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155
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156 /**
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157 * Check to make sure that underlying input stream has not been
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158 * nulled out due to close; if not return it;
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159 */
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160 private InputStream getInIfOpen() throws IOException {
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161 InputStream input = in;
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162 if (input == null)
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163 throw new IOException("Stream closed");
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164 return input;
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165 }
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166
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167 /**
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168 * Check to make sure that buffer has not been nulled out due to
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169 * close; if not return it;
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170 */
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171 private byte[] getBufIfOpen() throws IOException {
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172 byte[] buffer = buf;
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173 if (buffer == null)
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174 throw new IOException("Stream closed");
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175 return buffer;
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176 }
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177
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178 /**
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179 * Creates a <code>BufferedInputStream</code>
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180 * and saves its argument, the input stream
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181 * <code>in</code>, for later use. An internal
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182 * buffer array is created and stored in <code>buf</code>.
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183 *
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184 * @param in the underlying input stream.
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185 */
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186 public BufferedInputStream(InputStream in) {
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187 this(in, DEFAULT_BUFFER_SIZE);
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188 }
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189
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190 /**
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191 * Creates a <code>BufferedInputStream</code>
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192 * with the specified buffer size,
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193 * and saves its argument, the input stream
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194 * <code>in</code>, for later use. An internal
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195 * buffer array of length <code>size</code>
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196 * is created and stored in <code>buf</code>.
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197 *
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198 * @param in the underlying input stream.
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199 * @param size the buffer size.
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200 * @exception IllegalArgumentException if {@code size <= 0}.
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201 */
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202 public BufferedInputStream(InputStream in, int size) {
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203 super(in);
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204 if (size <= 0) {
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205 throw new IllegalArgumentException("Buffer size <= 0");
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206 }
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207 buf = new byte[size];
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208 }
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209
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210 /**
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211 * Fills the buffer with more data, taking into account
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212 * shuffling and other tricks for dealing with marks.
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213 * Assumes that it is being called by a synchronized method.
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214 * This method also assumes that all data has already been read in,
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215 * hence pos > count.
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216 */
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217 private void fill() throws IOException {
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218 byte[] buffer = getBufIfOpen();
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219 if (markpos < 0)
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220 pos = 0; /* no mark: throw away the buffer */
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221 else if (pos >= buffer.length) /* no room left in buffer */
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222 if (markpos > 0) { /* can throw away early part of the buffer */
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223 int sz = pos - markpos;
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224 System.arraycopy(buffer, markpos, buffer, 0, sz);
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225 pos = sz;
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226 markpos = 0;
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227 } else if (buffer.length >= marklimit) {
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228 markpos = -1; /* buffer got too big, invalidate mark */
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229 pos = 0; /* drop buffer contents */
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230 } else if (buffer.length >= MAX_BUFFER_SIZE) {
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231 throw new OutOfMemoryError("Required array size too large");
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232 } else { /* grow buffer */
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233 int nsz = (pos <= MAX_BUFFER_SIZE - pos) ?
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234 pos * 2 : MAX_BUFFER_SIZE;
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235 if (nsz > marklimit)
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236 nsz = marklimit;
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237 byte nbuf[] = new byte[nsz];
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238 System.arraycopy(buffer, 0, nbuf, 0, pos);
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239 if (!bufUpdater.compareAndSet(this, buffer, nbuf)) {
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240 // Can't replace buf if there was an async close.
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241 // Note: This would need to be changed if fill()
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242 // is ever made accessible to multiple threads.
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243 // But for now, the only way CAS can fail is via close.
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244 // assert buf == null;
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245 throw new IOException("Stream closed");
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246 }
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247 buffer = nbuf;
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248 }
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249 count = pos;
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250 int n = getInIfOpen().read(buffer, pos, buffer.length - pos);
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251 if (n > 0)
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252 count = n + pos;
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253 }
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254
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255 /**
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256 * See
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257 * the general contract of the <code>read</code>
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258 * method of <code>InputStream</code>.
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259 *
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260 * @return the next byte of data, or <code>-1</code> if the end of the
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261 * stream is reached.
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262 * @exception IOException if this input stream has been closed by
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263 * invoking its {@link #close()} method,
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264 * or an I/O error occurs.
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265 * @see java.io.FilterInputStream#in
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266 */
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267 public synchronized int read() throws IOException {
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268 if (pos >= count) {
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269 fill();
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270 if (pos >= count)
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271 return -1;
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272 }
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273 return getBufIfOpen()[pos++] & 0xff;
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274 }
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275
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276 /**
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277 * Read characters into a portion of an array, reading from the underlying
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278 * stream at most once if necessary.
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279 */
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280 private int read1(byte[] b, int off, int len) throws IOException {
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281 int avail = count - pos;
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282 if (avail <= 0) {
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283 /* If the requested length is at least as large as the buffer, and
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284 if there is no mark/reset activity, do not bother to copy the
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285 bytes into the local buffer. In this way buffered streams will
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286 cascade harmlessly. */
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287 if (len >= getBufIfOpen().length && markpos < 0) {
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288 return getInIfOpen().read(b, off, len);
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289 }
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290 fill();
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291 avail = count - pos;
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292 if (avail <= 0) return -1;
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293 }
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294 int cnt = (avail < len) ? avail : len;
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295 System.arraycopy(getBufIfOpen(), pos, b, off, cnt);
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296 pos += cnt;
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297 return cnt;
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298 }
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299
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300 /**
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301 * Reads bytes from this byte-input stream into the specified byte array,
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302 * starting at the given offset.
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303 *
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304 * <p> This method implements the general contract of the corresponding
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305 * <code>{@link InputStream#read(byte[], int, int) read}</code> method of
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306 * the <code>{@link InputStream}</code> class. As an additional
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307 * convenience, it attempts to read as many bytes as possible by repeatedly
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308 * invoking the <code>read</code> method of the underlying stream. This
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309 * iterated <code>read</code> continues until one of the following
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310 * conditions becomes true: <ul>
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311 *
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312 * <li> The specified number of bytes have been read,
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313 *
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314 * <li> The <code>read</code> method of the underlying stream returns
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315 * <code>-1</code>, indicating end-of-file, or
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316 *
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317 * <li> The <code>available</code> method of the underlying stream
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318 * returns zero, indicating that further input requests would block.
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319 *
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320 * </ul> If the first <code>read</code> on the underlying stream returns
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321 * <code>-1</code> to indicate end-of-file then this method returns
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322 * <code>-1</code>. Otherwise this method returns the number of bytes
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323 * actually read.
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324 *
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325 * <p> Subclasses of this class are encouraged, but not required, to
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326 * attempt to read as many bytes as possible in the same fashion.
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327 *
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328 * @param b destination buffer.
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329 * @param off offset at which to start storing bytes.
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330 * @param len maximum number of bytes to read.
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331 * @return the number of bytes read, or <code>-1</code> if the end of
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332 * the stream has been reached.
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333 * @exception IOException if this input stream has been closed by
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334 * invoking its {@link #close()} method,
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335 * or an I/O error occurs.
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336 */
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337 public synchronized int read(byte b[], int off, int len)
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338 throws IOException
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339 {
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340 getBufIfOpen(); // Check for closed stream
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341 if ((off | len | (off + len) | (b.length - (off + len))) < 0) {
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342 throw new IndexOutOfBoundsException();
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343 } else if (len == 0) {
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344 return 0;
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345 }
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346
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347 int n = 0;
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348 for (;;) {
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349 int nread = read1(b, off + n, len - n);
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350 if (nread <= 0)
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351 return (n == 0) ? nread : n;
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352 n += nread;
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353 if (n >= len)
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354 return n;
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355 // if not closed but no bytes available, return
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356 InputStream input = in;
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357 if (input != null && input.available() <= 0)
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358 return n;
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359 }
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360 }
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361
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362 /**
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363 * See the general contract of the <code>skip</code>
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364 * method of <code>InputStream</code>.
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365 *
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366 * @exception IOException if the stream does not support seek,
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367 * or if this input stream has been closed by
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368 * invoking its {@link #close()} method, or an
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369 * I/O error occurs.
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370 */
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371 public synchronized long skip(long n) throws IOException {
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372 getBufIfOpen(); // Check for closed stream
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373 if (n <= 0) {
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374 return 0;
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375 }
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376 long avail = count - pos;
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377
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378 if (avail <= 0) {
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379 // If no mark position set then don't keep in buffer
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380 if (markpos <0)
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381 return getInIfOpen().skip(n);
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382
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383 // Fill in buffer to save bytes for reset
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384 fill();
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385 avail = count - pos;
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386 if (avail <= 0)
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387 return 0;
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388 }
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389
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390 long skipped = (avail < n) ? avail : n;
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391 pos += skipped;
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392 return skipped;
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393 }
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394
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395 /**
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396 * Returns an estimate of the number of bytes that can be read (or
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397 * skipped over) from this input stream without blocking by the next
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398 * invocation of a method for this input stream. The next invocation might be
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399 * the same thread or another thread. A single read or skip of this
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400 * many bytes will not block, but may read or skip fewer bytes.
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401 * <p>
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402 * This method returns the sum of the number of bytes remaining to be read in
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403 * the buffer (<code>count&nbsp;- pos</code>) and the result of calling the
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404 * {@link java.io.FilterInputStream#in in}.available().
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405 *
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406 * @return an estimate of the number of bytes that can be read (or skipped
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407 * over) from this input stream without blocking.
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408 * @exception IOException if this input stream has been closed by
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409 * invoking its {@link #close()} method,
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410 * or an I/O error occurs.
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411 */
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412 public synchronized int available() throws IOException {
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413 int n = count - pos;
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414 int avail = getInIfOpen().available();
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415 return n > (Integer.MAX_VALUE - avail)
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416 ? Integer.MAX_VALUE
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417 : n + avail;
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418 }
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419
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420 /**
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421 * See the general contract of the <code>mark</code>
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422 * method of <code>InputStream</code>.
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423 *
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424 * @param readlimit the maximum limit of bytes that can be read before
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425 * the mark position becomes invalid.
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426 * @see java.io.BufferedInputStream#reset()
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427 */
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428 public synchronized void mark(int readlimit) {
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429 marklimit = readlimit;
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430 markpos = pos;
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431 }
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432
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433 /**
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434 * See the general contract of the <code>reset</code>
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435 * method of <code>InputStream</code>.
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436 * <p>
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437 * If <code>markpos</code> is <code>-1</code>
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438 * (no mark has been set or the mark has been
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439 * invalidated), an <code>IOException</code>
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440 * is thrown. Otherwise, <code>pos</code> is
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441 * set equal to <code>markpos</code>.
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442 *
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443 * @exception IOException if this stream has not been marked or,
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444 * if the mark has been invalidated, or the stream
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445 * has been closed by invoking its {@link #close()}
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446 * method, or an I/O error occurs.
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447 * @see java.io.BufferedInputStream#mark(int)
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448 */
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449 public synchronized void reset() throws IOException {
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450 getBufIfOpen(); // Cause exception if closed
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451 if (markpos < 0)
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452 throw new IOException("Resetting to invalid mark");
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453 pos = markpos;
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454 }
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455
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456 /**
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457 * Tests if this input stream supports the <code>mark</code>
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458 * and <code>reset</code> methods. The <code>markSupported</code>
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459 * method of <code>BufferedInputStream</code> returns
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460 * <code>true</code>.
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461 *
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462 * @return a <code>boolean</code> indicating if this stream type supports
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463 * the <code>mark</code> and <code>reset</code> methods.
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464 * @see java.io.InputStream#mark(int)
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465 * @see java.io.InputStream#reset()
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466 */
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467 public boolean markSupported() {
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468 return true;
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469 }
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470
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471 /**
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472 * Closes this input stream and releases any system resources
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473 * associated with the stream.
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474 * Once the stream has been closed, further read(), available(), reset(),
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475 * or skip() invocations will throw an IOException.
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476 * Closing a previously closed stream has no effect.
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477 *
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478 * @exception IOException if an I/O error occurs.
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479 */
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480 public void close() throws IOException {
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481 byte[] buffer;
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482 while ( (buffer = buf) != null) {
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483 if (bufUpdater.compareAndSet(this, buffer, null)) {
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484 InputStream input = in;
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485 in = null;
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486 if (input != null)
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487 input.close();
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488 return;
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489 }
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490 // Else retry in case a new buf was CASed in fill()
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491 }
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492 }
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493 }