Mercurial > hg > blitz_stable

annotate src/com/go/trove/io/FastBufferedInputStream.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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137 ensureOpen();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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138 if (n <= 0) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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139 return 0;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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140 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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141 long avail = mCount - mPos;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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142
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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143 if (avail <= 0) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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144 if (mMarkPos <0) {
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Dan Creswell <dan.creswell@gmail.com>
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145 return in.skip(n);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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146 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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147
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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148 fill();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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149 avail = mCount - mPos;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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150 if (avail <= 0) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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151 return 0;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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152 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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153 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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154
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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155 long skipped = (avail < n) ? avail : n;
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Dan Creswell <dan.creswell@gmail.com>
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156 mPos += skipped;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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157 return skipped;
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Dan Creswell <dan.creswell@gmail.com>
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158 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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159
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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160 public int available() throws IOException {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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161 ensureOpen();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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162 return (mCount - mPos) + in.available();
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Dan Creswell <dan.creswell@gmail.com>
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163 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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164
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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165 public void mark(int readlimit) {
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Dan Creswell <dan.creswell@gmail.com>
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166 mMarkLimit = readlimit;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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167 mMarkPos = mPos;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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168 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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169
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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170 public void reset() throws IOException {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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171 ensureOpen();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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172 if (mMarkPos < 0) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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173 throw new IOException("Resetting to invalid mark");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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174 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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175 mPos = mMarkPos;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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176 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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177
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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178 public boolean markSupported() {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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179 return true;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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180 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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181
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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182 public void close() throws IOException {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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183 if (in != null) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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184 in.close();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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185 in = null;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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186 mBuffer = null;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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187 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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188 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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189 }