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annotate src/goodjava/io/BufferedInputStream.java @ 1660:2968e43cdd44

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author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 19 Apr 2022 23:46:06 -0600
parents 91c167099462
children
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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 package goodjava.io;
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7
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8 import java.io.InputStream;
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9 import java.io.IOException;
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10
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11 /**
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12 * A <code>BufferedInputStream</code> adds
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13 * functionality to another input stream-namely,
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14 * the ability to buffer the input. When the <code>BufferedInputStream</code>
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15 * is created, an internal buffer array is
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16 * created. As bytes from the stream are read
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17 * or skipped, the internal buffer is refilled
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18 * as necessary from the contained input stream,
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19 * many bytes at a time.
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20 *
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21 * @author Arthur van Hoff
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22 * @since JDK1.0
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23 */
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24 public final class BufferedInputStream extends NoMarkInputStream {
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25 private final byte buf[];
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26
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27 /**
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28 * The index one greater than the index of the last valid byte in
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29 * the buffer.
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30 * This value is always
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31 * in the range <code>0</code> through <code>buf.length</code>;
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32 * elements <code>buf[0]</code> through <code>buf[count-1]
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33 * </code>contain buffered input data obtained
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34 * from the underlying input stream.
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35 */
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36 private int count;
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37
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38 /**
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39 * The current position in the buffer. This is the index of the next
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40 * character to be read from the <code>buf</code> array.
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41 * <p>
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42 * This value is always in the range <code>0</code>
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43 * through <code>count</code>. If it is less
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44 * than <code>count</code>, then <code>buf[pos]</code>
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45 * is the next byte to be supplied as input;
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46 * if it is equal to <code>count</code>, then
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47 * the next <code>read</code> or <code>skip</code>
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48 * operation will require more bytes to be
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49 * read from the contained input stream.
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50 *
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51 * @see java.io.BufferedInputStream#buf
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52 */
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53 private int pos;
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54
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55 /**
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56 * Creates a <code>BufferedInputStream</code>
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57 * and saves its argument, the input stream
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58 * <code>in</code>, for later use. An internal
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59 * buffer array is created and stored in <code>buf</code>.
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60 *
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61 * @param in the underlying input stream.
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62 */
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63 public BufferedInputStream(InputStream in) {
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64 this(in, 8192);
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65 }
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66
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67 /**
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68 * Creates a <code>BufferedInputStream</code>
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69 * with the specified buffer size,
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70 * and saves its argument, the input stream
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71 * <code>in</code>, for later use. An internal
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72 * buffer array of length <code>size</code>
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73 * is created and stored in <code>buf</code>.
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74 *
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75 * @param in the underlying input stream.
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76 * @param size the buffer size.
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77 */
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78 public BufferedInputStream(InputStream in, int size) {
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79 super(in);
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80 buf = new byte[size];
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81 }
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82
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83 /**
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84 * Fills the buffer with more data.
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85 * This method also assumes that all data has already been read in,
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86 * hence pos > count.
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87 */
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88 private void fill() throws IOException {
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89 pos = 0;
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90 count = 0;
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91 int n = in.read(buf, 0, buf.length);
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92 if (n > 0)
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93 count = n;
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94 }
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95
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96 /**
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97 * See
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98 * the general contract of the <code>read</code>
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99 * method of <code>InputStream</code>.
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100 *
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101 * @return the next byte of data, or <code>-1</code> if the end of the
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102 * stream is reached.
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103 * @exception IOException if this input stream has been closed by
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104 * invoking its {@link #close()} method,
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105 * or an I/O error occurs.
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106 * @see java.io.FilterInputStream#in
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107 */
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108 public int read() throws IOException {
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109 if (pos >= count) {
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110 fill();
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111 if (pos >= count)
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112 return -1;
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113 }
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114 return buf[pos++] & 0xff;
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115 }
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116
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117 /**
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118 * Read characters into a portion of an array, reading from the underlying
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119 * stream at most once if necessary.
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120 */
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121 private int read1(byte[] b, int off, int len) throws IOException {
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122 int cnt = 0;
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123 int avail = count - pos;
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124 if( avail > 0 ) {
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125 cnt = (avail < len) ? avail : len;
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126 System.arraycopy(buf, pos, b, off, cnt);
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127 pos += cnt;
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128 len -= cnt;
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129 if( len == 0 )
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130 return cnt;
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131 off += cnt;
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132 }
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133 if (len >= buf.length) {
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134 return cnt + Math.max( 0, in.read(b, off, len) );
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135 }
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136 fill();
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137 if (count <= 0)
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138 return cnt;
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139 System.arraycopy(buf, 0, b, off, len);
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140 pos += len;
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141 return cnt + len;
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142 }
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143
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144 public int read(byte[] b, int off, int len) throws IOException {
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145 if( len == 0 )
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146 return 0;
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147 int n = read1(b,off,len);
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148 return n==0 ? -1 : n;
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149 }
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150
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151 /**
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152 * See the general contract of the <code>skip</code>
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153 * method of <code>InputStream</code>.
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154 *
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155 * @exception IOException if the stream does not support seek,
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156 * or if this input stream has been closed by
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157 * invoking its {@link #close()} method, or an
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158 * I/O error occurs.
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159 */
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160 public long skip(long n) throws IOException {
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161 if( n <= 0 )
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162 return 0;
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163 long skipped = 0;
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164 long avail = count - pos;
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165 if( avail > 0 ) {
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166 skipped = (avail < n) ? avail : n;
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167 pos += skipped;
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168 n -= skipped;
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169 if( n == 0 )
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170 return skipped;
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171 }
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172 return skipped + in.skip(n);
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173 }
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174
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175 /**
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176 * Returns an estimate of the number of bytes that can be read (or
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177 * skipped over) from this input stream without blocking by the next
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178 * invocation of a method for this input stream. The next invocation might be
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179 * the same thread or another thread. A single read or skip of this
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180 * many bytes will not block, but may read or skip fewer bytes.
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181 * <p>
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182 * This method returns the sum of the number of bytes remaining to be read in
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183 * the buffer (<code>count&nbsp;- pos</code>) and the result of calling the
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184 * {@link java.io.FilterInputStream#in in}.available().
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185 *
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186 * @return an estimate of the number of bytes that can be read (or skipped
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187 * over) from this input stream without blocking.
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188 * @exception IOException if this input stream has been closed by
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189 * invoking its {@link #close()} method,
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190 * or an I/O error occurs.
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191 */
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192 public int available() throws IOException {
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193 int n = count - pos;
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194 int avail = in.available();
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195 return n > (Integer.MAX_VALUE - avail)
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196 ? Integer.MAX_VALUE
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197 : n + avail;
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198 }
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37e582f2e266 clone BufferedInputStream
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199
37e582f2e266 clone BufferedInputStream
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200 }