annotate src/com/jcraft/jzlib/Inflate.java @ 67:99d5b02ad90c tn5250

allow host override terminal type
author Carl Byington <carl@five-ten-sg.com>
date Fri, 13 Jun 2014 16:17:26 -0700
parents 0ce5cc452d02
children 46c2115ae1c8
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1 /* -*-mode:java; c-basic-offset:2; -*- */
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2 /*
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3 Copyright (c) 2000,2001,2002,2003 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 * This program is based on zlib-1.1.3, so all credit should go authors
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31 * Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu)
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32 * and contributors of zlib.
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33 */
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34
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35 package com.jcraft.jzlib;
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36
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37 final class Inflate {
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38
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39 static final private int MAX_WBITS = 15; // 32K LZ77 window
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40
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41 // preset dictionary flag in zlib header
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42 static final private int PRESET_DICT = 0x20;
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43
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44 static final int Z_NO_FLUSH = 0;
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45 static final int Z_PARTIAL_FLUSH = 1;
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46 static final int Z_SYNC_FLUSH = 2;
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47 static final int Z_FULL_FLUSH = 3;
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48 static final int Z_FINISH = 4;
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49
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50 static final private int Z_DEFLATED = 8;
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51
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52 static final private int Z_OK = 0;
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53 static final private int Z_STREAM_END = 1;
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54 static final private int Z_NEED_DICT = 2;
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55 static final private int Z_ERRNO = -1;
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56 static final private int Z_STREAM_ERROR = -2;
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57 static final private int Z_DATA_ERROR = -3;
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58 static final private int Z_MEM_ERROR = -4;
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59 static final private int Z_BUF_ERROR = -5;
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60 static final private int Z_VERSION_ERROR = -6;
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61
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62 static final private int METHOD = 0; // waiting for method byte
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63 static final private int FLAG = 1; // waiting for flag byte
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64 static final private int DICT4 = 2; // four dictionary check bytes to go
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65 static final private int DICT3 = 3; // three dictionary check bytes to go
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66 static final private int DICT2 = 4; // two dictionary check bytes to go
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67 static final private int DICT1 = 5; // one dictionary check byte to go
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68 static final private int DICT0 = 6; // waiting for inflateSetDictionary
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69 static final private int BLOCKS = 7; // decompressing blocks
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70 static final private int CHECK4 = 8; // four check bytes to go
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71 static final private int CHECK3 = 9; // three check bytes to go
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72 static final private int CHECK2 = 10; // two check bytes to go
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73 static final private int CHECK1 = 11; // one check byte to go
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74 static final private int DONE = 12; // finished check, done
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75 static final private int BAD = 13; // got an error--stay here
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76
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77 int mode; // current inflate mode
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78
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79 // mode dependent information
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80 int method; // if FLAGS, method byte
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81
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82 // if CHECK, check values to compare
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83 long[] was = new long[1] ; // computed check value
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84 long need; // stream check value
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85
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86 // if BAD, inflateSync's marker bytes count
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87 int marker;
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88
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89 // mode independent information
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90 int nowrap; // flag for no wrapper
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91 int wbits; // log2(window size) (8..15, defaults to 15)
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92
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93 InfBlocks blocks; // current inflate_blocks state
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94
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95 int inflateReset(ZStream z) {
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96 if (z == null || z.istate == null) return Z_STREAM_ERROR;
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97
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98 z.total_in = z.total_out = 0;
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99 z.msg = null;
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100 z.istate.mode = z.istate.nowrap != 0 ? BLOCKS : METHOD;
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101 z.istate.blocks.reset(z, null);
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102 return Z_OK;
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103 }
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104
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105 int inflateEnd(ZStream z) {
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106 if (blocks != null)
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107 blocks.free(z);
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108
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109 blocks = null;
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110 // ZFREE(z, z->state);
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111 return Z_OK;
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112 }
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113
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114 int inflateInit(ZStream z, int w) {
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115 z.msg = null;
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116 blocks = null;
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117 // handle undocumented nowrap option (no zlib header or check)
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118 nowrap = 0;
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119
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120 if (w < 0) {
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121 w = - w;
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122 nowrap = 1;
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123 }
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124
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125 // set window size
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126 if (w < 8 || w > 15) {
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127 inflateEnd(z);
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128 return Z_STREAM_ERROR;
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129 }
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130
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131 wbits = w;
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132 z.istate.blocks = new InfBlocks(z,
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133 z.istate.nowrap != 0 ? null : this,
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134 1 << w);
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135 // reset state
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136 inflateReset(z);
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137 return Z_OK;
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138 }
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139
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140 int inflate(ZStream z, int f) {
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141 int r;
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142 int b;
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143
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144 if (z == null || z.istate == null || z.next_in == null)
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145 return Z_STREAM_ERROR;
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146
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147 f = f == Z_FINISH ? Z_BUF_ERROR : Z_OK;
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148 r = Z_BUF_ERROR;
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149
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150 while (true) {
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151 //System.out.println("mode: "+z.istate.mode);
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152 switch (z.istate.mode) {
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153 case METHOD:
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154 if (z.avail_in == 0)return r; r = f;
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155
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156 z.avail_in--; z.total_in++;
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157
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158 if (((z.istate.method = z.next_in[z.next_in_index++]) & 0xf) != Z_DEFLATED) {
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159 z.istate.mode = BAD;
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160 z.msg = "unknown compression method";
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161 z.istate.marker = 5; // can't try inflateSync
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162 break;
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163 }
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164
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165 if ((z.istate.method >> 4) + 8 > z.istate.wbits) {
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Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
166 z.istate.mode = BAD;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
167 z.msg = "invalid window size";
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
168 z.istate.marker = 5; // can't try inflateSync
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
169 break;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
170 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
171
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
172 z.istate.mode = FLAG;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
173
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
174 case FLAG:
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
175 if (z.avail_in == 0)return r; r = f;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
176
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
177 z.avail_in--; z.total_in++;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
178 b = (z.next_in[z.next_in_index++]) & 0xff;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
179
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
180 if ((((z.istate.method << 8) + b) % 31) != 0) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
181 z.istate.mode = BAD;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
182 z.msg = "incorrect header check";
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
183 z.istate.marker = 5; // can't try inflateSync
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
184 break;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
185 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
186
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
187 if ((b & PRESET_DICT) == 0) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
188 z.istate.mode = BLOCKS;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
189 break;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
190 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
191
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
192 z.istate.mode = DICT4;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
193
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
194 case DICT4:
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
195 if (z.avail_in == 0)return r; r = f;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
196
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
197 z.avail_in--; z.total_in++;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
198 z.istate.need = ((z.next_in[z.next_in_index++] & 0xff) << 24) & 0xff000000L;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
199 z.istate.mode = DICT3;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
200
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
201 case DICT3:
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
202 if (z.avail_in == 0)return r; r = f;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
203
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
204 z.avail_in--; z.total_in++;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
205 z.istate.need += ((z.next_in[z.next_in_index++] & 0xff) << 16) & 0xff0000L;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
206 z.istate.mode = DICT2;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
207
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
208 case DICT2:
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
209 if (z.avail_in == 0)return r; r = f;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
210
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
211 z.avail_in--; z.total_in++;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
212 z.istate.need += ((z.next_in[z.next_in_index++] & 0xff) << 8) & 0xff00L;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
213 z.istate.mode = DICT1;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
214
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
215 case DICT1:
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
216 if (z.avail_in == 0)return r; r = f;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
217
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
218 z.avail_in--; z.total_in++;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
219 z.istate.need += (z.next_in[z.next_in_index++] & 0xffL);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
220 z.adler = z.istate.need;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
221 z.istate.mode = DICT0;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
222 return Z_NEED_DICT;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
223
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
224 case DICT0:
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
225 z.istate.mode = BAD;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
226 z.msg = "need dictionary";
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
227 z.istate.marker = 0; // can try inflateSync
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
228 return Z_STREAM_ERROR;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
229
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
230 case BLOCKS:
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
231 r = z.istate.blocks.proc(z, r);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
232
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
233 if (r == Z_DATA_ERROR) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
234 z.istate.mode = BAD;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
235 z.istate.marker = 0; // can try inflateSync
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
236 break;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
237 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
238
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
239 if (r == Z_OK) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
240 r = f;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
241 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
242
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
243 if (r != Z_STREAM_END) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
244 return r;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
245 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
246
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
247 r = f;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
248 z.istate.blocks.reset(z, z.istate.was);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
249
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
250 if (z.istate.nowrap != 0) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
251 z.istate.mode = DONE;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
252 break;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
253 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
254
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
255 z.istate.mode = CHECK4;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
256
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
257 case CHECK4:
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
258 if (z.avail_in == 0)return r; r = f;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
259
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
260 z.avail_in--; z.total_in++;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
261 z.istate.need = ((z.next_in[z.next_in_index++] & 0xff) << 24) & 0xff000000L;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
262 z.istate.mode = CHECK3;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
263
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
264 case CHECK3:
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
265 if (z.avail_in == 0)return r; r = f;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
266
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
267 z.avail_in--; z.total_in++;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
268 z.istate.need += ((z.next_in[z.next_in_index++] & 0xff) << 16) & 0xff0000L;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
269 z.istate.mode = CHECK2;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
270
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
271 case CHECK2:
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
272 if (z.avail_in == 0)return r; r = f;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
273
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
274 z.avail_in--; z.total_in++;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
275 z.istate.need += ((z.next_in[z.next_in_index++] & 0xff) << 8) & 0xff00L;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
276 z.istate.mode = CHECK1;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
277
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
278 case CHECK1:
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
279 if (z.avail_in == 0)return r; r = f;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
280
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
281 z.avail_in--; z.total_in++;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
282 z.istate.need += (z.next_in[z.next_in_index++] & 0xffL);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
283
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
284 if (((int)(z.istate.was[0])) != ((int)(z.istate.need))) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
285 z.istate.mode = BAD;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
286 z.msg = "incorrect data check";
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
287 z.istate.marker = 5; // can't try inflateSync
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
288 break;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
289 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
290
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
291 z.istate.mode = DONE;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
292
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
293 case DONE:
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
294 return Z_STREAM_END;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
295
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
296 case BAD:
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
297 return Z_DATA_ERROR;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
298
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
299 default:
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
300 return Z_STREAM_ERROR;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
301 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
302 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
303 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
304
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
305
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
306 int inflateSetDictionary(ZStream z, byte[] dictionary, int dictLength) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
307 int index = 0;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
308 int length = dictLength;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
309
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
310 if (z == null || z.istate == null || z.istate.mode != DICT0)
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
311 return Z_STREAM_ERROR;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
312
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
313 if (z._adler.adler32(1L, dictionary, 0, dictLength) != z.adler) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
314 return Z_DATA_ERROR;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
315 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
316
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
317 z.adler = z._adler.adler32(0, null, 0, 0);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
318
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
319 if (length >= (1 << z.istate.wbits)) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
320 length = (1 << z.istate.wbits) - 1;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
321 index = dictLength - length;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
322 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
323
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
324 z.istate.blocks.set_dictionary(dictionary, index, length);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
325 z.istate.mode = BLOCKS;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
326 return Z_OK;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
327 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
328
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
329 static private byte[] mark = { (byte)0, (byte)0, (byte)0xff, (byte)0xff};
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
330
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
331 int inflateSync(ZStream z) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
332 int n; // number of bytes to look at
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
333 int p; // pointer to bytes
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
334 int m; // number of marker bytes found in a row
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335 long r, w; // temporaries to save total_in and total_out
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336
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Carl Byington <carl@five-ten-sg.com>
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337 // set up
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338 if (z == null || z.istate == null)
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Carl Byington <carl@five-ten-sg.com>
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339 return Z_STREAM_ERROR;
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Carl Byington <carl@five-ten-sg.com>
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340
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Carl Byington <carl@five-ten-sg.com>
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341 if (z.istate.mode != BAD) {
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342 z.istate.mode = BAD;
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Carl Byington <carl@five-ten-sg.com>
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343 z.istate.marker = 0;
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Carl Byington <carl@five-ten-sg.com>
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344 }
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345
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Carl Byington <carl@five-ten-sg.com>
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346 if ((n = z.avail_in) == 0)
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Carl Byington <carl@five-ten-sg.com>
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347 return Z_BUF_ERROR;
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Carl Byington <carl@five-ten-sg.com>
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348
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Carl Byington <carl@five-ten-sg.com>
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349 p = z.next_in_index;
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Carl Byington <carl@five-ten-sg.com>
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350 m = z.istate.marker;
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Carl Byington <carl@five-ten-sg.com>
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351
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Carl Byington <carl@five-ten-sg.com>
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352 // search
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Carl Byington <carl@five-ten-sg.com>
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353 while (n != 0 && m < 4) {
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Carl Byington <carl@five-ten-sg.com>
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354 if (z.next_in[p] == mark[m]) {
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Carl Byington <carl@five-ten-sg.com>
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355 m++;
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Carl Byington <carl@five-ten-sg.com>
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356 }
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Carl Byington <carl@five-ten-sg.com>
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357 else if (z.next_in[p] != 0) {
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358 m = 0;
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Carl Byington <carl@five-ten-sg.com>
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359 }
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Carl Byington <carl@five-ten-sg.com>
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360 else {
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Carl Byington <carl@five-ten-sg.com>
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361 m = 4 - m;
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Carl Byington <carl@five-ten-sg.com>
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362 }
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Carl Byington <carl@five-ten-sg.com>
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363
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Carl Byington <carl@five-ten-sg.com>
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364 p++; n--;
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Carl Byington <carl@five-ten-sg.com>
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365 }
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Carl Byington <carl@five-ten-sg.com>
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366
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Carl Byington <carl@five-ten-sg.com>
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367 // restore
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Carl Byington <carl@five-ten-sg.com>
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368 z.total_in += p - z.next_in_index;
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Carl Byington <carl@five-ten-sg.com>
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369 z.next_in_index = p;
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Carl Byington <carl@five-ten-sg.com>
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370 z.avail_in = n;
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Carl Byington <carl@five-ten-sg.com>
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371 z.istate.marker = m;
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Carl Byington <carl@five-ten-sg.com>
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372
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Carl Byington <carl@five-ten-sg.com>
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373 // return no joy or set up to restart on a new block
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Carl Byington <carl@five-ten-sg.com>
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374 if (m != 4) {
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Carl Byington <carl@five-ten-sg.com>
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375 return Z_DATA_ERROR;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
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376 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
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377
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
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378 r = z.total_in; w = z.total_out;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
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379 inflateReset(z);
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
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380 z.total_in = r; z.total_out = w;
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Carl Byington <carl@five-ten-sg.com>
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381 z.istate.mode = BLOCKS;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
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382 return Z_OK;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
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383 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
384
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
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385 // Returns true if inflate is currently at the end of a block generated
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
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386 // by Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
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387 // implementation to provide an additional safety check. PPP uses Z_SYNC_FLUSH
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
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388 // but removes the length bytes of the resulting empty stored block. When
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
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389 // decompressing, PPP checks that at the end of input packet, inflate is
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
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390 // waiting for these length bytes.
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
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391 int inflateSyncPoint(ZStream z) {
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
392 if (z == null || z.istate == null || z.istate.blocks == null)
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
393 return Z_STREAM_ERROR;
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
394
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
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395 return z.istate.blocks.sync_point();
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
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396 }
0ce5cc452d02 initial version
Carl Byington <carl@five-ten-sg.com>
parents:
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397 }