Mercurial > hg > blitz_condensed
annotate src/com/go/trove/io/FastBufferedInputStream.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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0
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1 /* |
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2 * @(#)BufferedInputStream.java 1.41 00/02/02 |
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3 * |
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4 * Copyright 1994-2000 Sun Microsystems, Inc. All Rights Reserved. |
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5 * |
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6 * This software is the proprietary information of Sun Microsystems, Inc. |
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7 * Use is subject to license terms. |
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8 * |
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9 */ |
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10 |
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11 package com.go.trove.io; |
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12 |
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13 import java.io.*; |
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14 |
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15 /** |
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16 * FastBufferedInputStream is just a slightly modified version of |
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17 * {@link java.io.BufferedInputStream}. The synchronization is gone, and so |
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18 * reads are faster. Refer to the original BufferedInputStream for |
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19 * documentation. |
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20 */ |
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21 /* @author Arthur van Hoff |
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22 * @version 1.41, 02/02/00 |
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23 * @since JDK1.0 |
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24 */ |
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25 public class FastBufferedInputStream extends FilterInputStream { |
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26 // These fields have been renamed and made private. In the original, they |
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27 // are protected. |
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28 private byte[] mBuffer; |
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29 private int mCount; |
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30 private int mPos; |
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31 private int mMarkPos = -1; |
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32 private int mMarkLimit; |
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33 |
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34 private void ensureOpen() throws IOException { |
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35 if (in == null) { |
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36 throw new IOException("Stream closed"); |
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37 } |
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38 } |
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39 |
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40 public FastBufferedInputStream(InputStream in) { |
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41 this(in, 2048); |
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42 } |
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43 |
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44 public FastBufferedInputStream(InputStream in, int size) { |
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45 super(in); |
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46 if (size <= 0) { |
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47 throw new IllegalArgumentException("Buffer size <= 0"); |
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48 } |
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49 mBuffer = new byte[size]; |
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50 } |
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51 |
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52 private void fill() throws IOException { |
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53 if (mMarkPos < 0) { |
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54 mPos = 0; |
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55 } |
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56 else if (mPos >= mBuffer.length) { |
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57 if (mMarkPos > 0) { |
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58 int sz = mPos - mMarkPos; |
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59 System.arraycopy(mBuffer, mMarkPos, mBuffer, 0, sz); |
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60 mPos = sz; |
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61 mMarkPos = 0; |
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62 } |
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63 else if (mBuffer.length >= mMarkLimit) { |
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64 mMarkPos = -1; |
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65 mPos = 0; |
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66 } |
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67 else { |
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68 int nsz = mPos * 2; |
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69 if (nsz > mMarkLimit) { |
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70 nsz = mMarkLimit; |
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71 } |
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72 byte nbuf[] = new byte[nsz]; |
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73 System.arraycopy(mBuffer, 0, nbuf, 0, mPos); |
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74 mBuffer = nbuf; |
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75 } |
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76 } |
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77 mCount = mPos; |
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78 int n = in.read(mBuffer, mPos, mBuffer.length - mPos); |
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79 if (n > 0) { |
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80 mCount = n + mPos; |
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81 } |
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82 } |
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83 |
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84 public int read() throws IOException { |
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85 ensureOpen(); |
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86 if (mPos >= mCount) { |
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87 fill(); |
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88 if (mPos >= mCount) { |
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89 return -1; |
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90 } |
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91 } |
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92 return mBuffer[mPos++] & 0xff; |
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93 } |
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94 |
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95 private int read1(byte[] b, int off, int len) throws IOException { |
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96 int avail = mCount - mPos; |
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97 if (avail <= 0) { |
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98 if (len >= mBuffer.length && mMarkPos < 0) { |
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99 return in.read(b, off, len); |
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100 } |
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101 fill(); |
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102 avail = mCount - mPos; |
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103 if (avail <= 0) { |
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104 return -1; |
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105 } |
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106 } |
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107 int cnt = (avail < len) ? avail : len; |
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108 System.arraycopy(mBuffer, mPos, b, off, cnt); |
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109 mPos += cnt; |
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110 return cnt; |
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111 } |
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112 |
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113 public int read(byte b[], int off, int len) throws IOException { |
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114 ensureOpen(); |
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115 if ((off | len | (off + len) | (b.length - (off + len))) < 0) { |
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116 throw new IndexOutOfBoundsException(); |
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117 } |
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118 else if (len == 0) { |
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119 return 0; |
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120 } |
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121 |
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122 int n = read1(b, off, len); |
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123 if (n <= 0) { |
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124 return n; |
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125 } |
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126 while ((n < len) && (in.available() > 0)) { |
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127 int n1 = read1(b, off + n, len - n); |
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128 if (n1 <= 0) { |
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129 break; |
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130 } |
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131 n += n1; |
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132 } |
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133 return n; |
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134 } |
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135 |
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136 public long skip(long n) throws IOException { |
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137 ensureOpen(); |
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138 if (n <= 0) { |
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139 return 0; |
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140 } |
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141 long avail = mCount - mPos; |
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142 |
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143 if (avail <= 0) { |
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144 if (mMarkPos <0) { |
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145 return in.skip(n); |
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146 } |
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147 |
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148 fill(); |
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149 avail = mCount - mPos; |
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150 if (avail <= 0) { |
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151 return 0; |
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152 } |
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153 } |
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154 |
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155 long skipped = (avail < n) ? avail : n; |
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156 mPos += skipped; |
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157 return skipped; |
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158 } |
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159 |
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160 public int available() throws IOException { |
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161 ensureOpen(); |
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162 return (mCount - mPos) + in.available(); |
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163 } |
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164 |
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165 public void mark(int readlimit) { |
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166 mMarkLimit = readlimit; |
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167 mMarkPos = mPos; |
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168 } |
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169 |
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170 public void reset() throws IOException { |
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171 ensureOpen(); |
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172 if (mMarkPos < 0) { |
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173 throw new IOException("Resetting to invalid mark"); |
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174 } |
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175 mPos = mMarkPos; |
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176 } |
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177 |
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178 public boolean markSupported() { |
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179 return true; |
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180 } |
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181 |
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182 public void close() throws IOException { |
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183 if (in != null) { |
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184 in.close(); |
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185 in = null; |
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186 mBuffer = null; |
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187 } |
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188 } |
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189 } |