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annotate dwt/internal/image/LEDataInputStream.d @ 0:380af2bdd8e5

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Upload of whole dwt tree
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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children 1a8b3cb347e0
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *******************************************************************************/
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11 module dwt.internal.image;
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12
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13
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14 import java.io.IOException;
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15 import java.io.InputStream;
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16
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17 final class LEDataInputStream : InputStream {
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18 int position;
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19 InputStream in;
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20
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21 /**
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22 * The byte array containing the bytes to read.
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23 */
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24 protected byte[] buf;
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25
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26 /**
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27 * The current position within the byte array <code>buf</code>. A value
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28 * equal to buf.length indicates no bytes available. A value of
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29 * 0 indicates the buffer is full.
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30 */
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31 protected int pos;
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32
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33
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34 public LEDataInputStream(InputStream input) {
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35 this(input, 512);
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36 }
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37
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38 public LEDataInputStream(InputStream input, int bufferSize) {
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39 this.in = input;
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40 if (bufferSize > 0) {
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41 buf = new byte[bufferSize];
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42 pos = bufferSize;
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43 }
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44 else throw new IllegalArgumentException();
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45 }
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46
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47 public void close() throws IOException {
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48 buf = null;
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49 if (in !is null) {
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50 in.close();
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51 in = null;
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52 }
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53 }
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54
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55 /**
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56 * Answer how many bytes were read.
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57 */
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58 public int getPosition() {
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59 return position;
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60 }
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61
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62 /**
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63 * Answers how many bytes are available for reading without blocking
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64 */
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65 public int available() throws IOException {
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66 if (buf is null) throw new IOException();
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67 return (buf.length - pos) + in.available();
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68 }
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69
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70 /**
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71 * Answer the next byte of the input stream.
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72 */
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73 public int read() throws IOException {
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74 if (buf is null) throw new IOException();
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75 if (pos < buf.length) {
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76 position++;
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77 return (buf[pos++] & 0xFF);
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78 }
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79 int c = in.read();
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80 if (c !is -1) position++;
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81 return c;
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82 }
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83
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84 /**
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85 * Don't imitate the JDK behaviour of reading a random number
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86 * of bytes when you can actually read them all.
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87 */
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88 public int read(byte b[], int off, int len) throws IOException {
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89 int read = 0, count;
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90 while (read !is len && (count = readData(b, off, len - read)) !is -1) {
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91 off += count;
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92 read += count;
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93 }
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94 position += read;
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95 if (read is 0 && read !is len) return -1;
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96 return read;
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97 }
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98
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99 /**
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100 * Reads at most <code>length</code> bytes from this LEDataInputStream and
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101 * stores them in byte array <code>buffer</code> starting at <code>offset</code>.
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102 * <p>
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103 * Answer the number of bytes actually read or -1 if no bytes were read and
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104 * end of stream was encountered. This implementation reads bytes from
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105 * the pushback buffer first, then the target stream if more bytes are required
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106 * to satisfy <code>count</code>.
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107 * </p>
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108 * @param buffer the byte array in which to store the read bytes.
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109 * @param offset the offset in <code>buffer</code> to store the read bytes.
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110 * @param length the maximum number of bytes to store in <code>buffer</code>.
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111 *
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112 * @return int the number of bytes actually read or -1 if end of stream.
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113 *
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114 * @exception java.io.IOException if an IOException occurs.
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115 */
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116 private int readData(byte[] buffer, int offset, int length) throws IOException {
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117 if (buf is null) throw new IOException();
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118 if (offset < 0 || offset > buffer.length ||
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119 length < 0 || (length > buffer.length - offset)) {
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120 throw new ArrayIndexOutOfBoundsException();
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121 }
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122
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123 int cacheCopied = 0;
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124 int newOffset = offset;
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125
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126 // Are there pushback bytes available?
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127 int available = buf.length - pos;
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128 if (available > 0) {
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129 cacheCopied = (available >= length) ? length : available;
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130 System.arraycopy(buf, pos, buffer, newOffset, cacheCopied);
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131 newOffset += cacheCopied;
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132 pos += cacheCopied;
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133 }
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134
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135 // Have we copied enough?
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136 if (cacheCopied is length) return length;
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137
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138 int inCopied = in.read(buffer, newOffset, length - cacheCopied);
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139
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140 if (inCopied > 0) return inCopied + cacheCopied;
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141 if (cacheCopied is 0) return inCopied;
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142 return cacheCopied;
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143 }
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144
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145 /**
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146 * Answer an integer comprised of the next
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147 * four bytes of the input stream.
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148 */
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149 public int readInt() throws IOException {
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150 byte[] buf = new byte[4];
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151 read(buf);
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152 return ((buf[3] & 0xFF) << 24) |
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153 ((buf[2] & 0xFF) << 16) |
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154 ((buf[1] & 0xFF) << 8) |
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155 (buf[0] & 0xFF);
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156 }
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157
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158 /**
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159 * Answer a short comprised of the next
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160 * two bytes of the input stream.
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161 */
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162 public short readShort() throws IOException {
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163 byte[] buf = new byte[2];
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164 read(buf);
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165 return (short)(((buf[1] & 0xFF) << 8) | (buf[0] & 0xFF));
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166 }
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167
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168 /**
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169 * Push back the entire content of the given buffer <code>b</code>.
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170 * <p>
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171 * The bytes are pushed so that they would be read back b[0], b[1], etc.
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172 * If the push back buffer cannot handle the bytes copied from <code>b</code>,
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173 * an IOException will be thrown and no byte will be pushed back.
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174 * </p>
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175 *
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176 * @param b the byte array containing bytes to push back into the stream
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177 *
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178 * @exception java.io.IOException if the pushback buffer is too small
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179 */
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180 public void unread(byte[] b) throws IOException {
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181 int length = b.length;
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182 if (length > pos) throw new IOException();
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183 position -= length;
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184 pos -= length;
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185 System.arraycopy(b, 0, buf, pos, length);
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186 }
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187 }