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annotate src/com/jcraft/jzlib/DeflaterOutputStream.java @ 416:07c1da90deab

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avoid null pointer
author Carl Byington <carl@five-ten-sg.com>
date Mon, 27 Oct 2014 13:58:42 -0700
parents 46c2115ae1c8
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
357
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1 /* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
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2 /*
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3 Copyright (c) 2011 ymnk, JCraft,Inc. All rights reserved.
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4
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5 Redistribution and use in source and binary forms, with or without
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6 modification, are permitted provided that the following conditions are met:
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7
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8 1. Redistributions of source code must retain the above copyright notice,
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9 this list of conditions and the following disclaimer.
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10
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11 2. Redistributions in binary form must reproduce the above copyright
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12 notice, this list of conditions and the following disclaimer in
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13 the documentation and/or other materials provided with the distribution.
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14
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15 3. The names of the authors may not be used to endorse or promote products
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16 derived from this software without specific prior written permission.
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17
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18 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
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19 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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20 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
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21 INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
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22 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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23 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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24 OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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25 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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26 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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27 EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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28 */
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29
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30 package com.jcraft.jzlib;
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31 import java.io.*;
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32
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33 public class DeflaterOutputStream extends FilterOutputStream {
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34
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35 protected final Deflater deflater;
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36
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37 protected byte[] buffer;
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38
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39 private boolean closed = false;
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40
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41 private boolean syncFlush = false;
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42
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43 private final byte[] buf1 = new byte[1];
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44
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45 protected boolean mydeflater = false;
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46
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47 private boolean close_out = true;
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48
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49 protected static final int DEFAULT_BUFSIZE = 512;
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50
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51 public DeflaterOutputStream(OutputStream out) throws IOException {
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52 this(out,
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53 new Deflater(JZlib.Z_DEFAULT_COMPRESSION),
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54 DEFAULT_BUFSIZE, true);
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55 mydeflater = true;
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56 }
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57
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58 public DeflaterOutputStream(OutputStream out, Deflater def) throws IOException {
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59 this(out, def, DEFAULT_BUFSIZE, true);
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60 }
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61
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62 public DeflaterOutputStream(OutputStream out,
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63 Deflater deflater,
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64 int size) throws IOException {
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65 this(out, deflater, size, true);
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66 }
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67 public DeflaterOutputStream(OutputStream out,
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68 Deflater deflater,
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69 int size,
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70 boolean close_out) throws IOException {
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71 super(out);
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72 if (out == null || deflater == null) {
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73 throw new NullPointerException();
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74 }
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75 else if (size <= 0) {
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76 throw new IllegalArgumentException("buffer size must be greater than 0");
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77 }
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78 this.deflater = deflater;
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79 buffer = new byte[size];
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80 this.close_out = close_out;
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81 }
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82
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83 public void write(int b) throws IOException {
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84 buf1[0] = (byte)(b & 0xff);
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85 write(buf1, 0, 1);
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86 }
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87
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88 public void write(byte[] b, int off, int len) throws IOException {
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89 if (deflater.finished()) {
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90 throw new IOException("finished");
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91 }
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92 else if (off<0 | len<0 | off+len>b.length) {
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93 throw new IndexOutOfBoundsException();
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94 }
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95 else if (len == 0) {
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96 return;
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97 }
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98 else {
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99 int flush = syncFlush ? JZlib.Z_SYNC_FLUSH : JZlib.Z_NO_FLUSH;
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100 deflater.setInput(b, off, len, true);
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101 while (deflater.avail_in>0) {
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102 int err = deflate(flush);
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103 if (err == JZlib.Z_STREAM_END)
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104 break;
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105 }
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106 }
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107 }
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108
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109 public void finish() throws IOException {
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110 while (!deflater.finished()) {
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111 deflate(JZlib.Z_FINISH);
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112 }
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113 }
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114
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115 public void close() throws IOException {
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116 if (!closed) {
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117 finish();
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118 if (mydeflater){
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119 deflater.end();
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120 }
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121 if(close_out)
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122 out.close();
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123 closed = true;
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124 }
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125 }
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126
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127 protected int deflate(int flush) throws IOException {
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128 deflater.setOutput(buffer, 0, buffer.length);
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129 int err = deflater.deflate(flush);
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130 switch(err) {
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131 case JZlib.Z_OK:
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132 case JZlib.Z_STREAM_END:
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133 break;
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134 case JZlib.Z_BUF_ERROR:
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135 if(deflater.avail_in<=0 && flush!=JZlib.Z_FINISH){
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136 // flush() without any data
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137 break;
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138 }
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139 default:
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140 throw new IOException("failed to deflate: error="+err+" avail_out="+deflater.avail_out);
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141 }
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142 int len = deflater.next_out_index;
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143 if (len > 0) {
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144 out.write(buffer, 0, len);
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145 }
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Carl Byington <carl@five-ten-sg.com>
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146 return err;
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147 }
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148
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149 public void flush() throws IOException {
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150 if (syncFlush && !deflater.finished()) {
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parents:
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151 while (true) {
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152 int err = deflate(JZlib.Z_SYNC_FLUSH);
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153 if (deflater.next_out_index < buffer.length)
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154 break;
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155 if (err == JZlib.Z_STREAM_END)
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156 break;
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157 }
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158 }
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159 out.flush();
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160 }
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parents:
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161
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162 public long getTotalIn() {
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163 return deflater.getTotalIn();
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164 }
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165
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166 public long getTotalOut() {
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167 return deflater.getTotalOut();
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parents:
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168 }
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parents:
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169
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170 public void setSyncFlush(boolean syncFlush){
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diff changeset
171 this.syncFlush = syncFlush;
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parents:
diff changeset
172 }
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parents:
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173
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diff changeset
174 public boolean getSyncFlush(){
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parents:
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175 return this.syncFlush;
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
176 }
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Carl Byington <carl@five-ten-sg.com>
parents:
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177
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
178 public Deflater getDeflater(){
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parents:
diff changeset
179 return deflater;
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parents:
diff changeset
180 }
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
181 }