Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zlib/doc/rfc1950.txt @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
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7 Network Working Group P. Deutsch
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8 Request for Comments: 1950 Aladdin Enterprises
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9 Category: Informational J-L. Gailly
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10 Info-ZIP
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11 May 1996
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14 ZLIB Compressed Data Format Specification version 3.3
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16 Status of This Memo
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18 This memo provides information for the Internet community. This memo
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19 does not specify an Internet standard of any kind. Distribution of
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20 this memo is unlimited.
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22 IESG Note:
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24 The IESG takes no position on the validity of any Intellectual
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25 Property Rights statements contained in this document.
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27 Notices
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29 Copyright (c) 1996 L. Peter Deutsch and Jean-Loup Gailly
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31 Permission is granted to copy and distribute this document for any
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32 purpose and without charge, including translations into other
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33 languages and incorporation into compilations, provided that the
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34 copyright notice and this notice are preserved, and that any
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35 substantive changes or deletions from the original are clearly
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36 marked.
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38 A pointer to the latest version of this and related documentation in
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39 HTML format can be found at the URL
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40 <ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html>.
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42 Abstract
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44 This specification defines a lossless compressed data format. The
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45 data can be produced or consumed, even for an arbitrarily long
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46 sequentially presented input data stream, using only an a priori
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47 bounded amount of intermediate storage. The format presently uses
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48 the DEFLATE compression method but can be easily extended to use
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49 other compression methods. It can be implemented readily in a manner
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50 not covered by patents. This specification also defines the ADLER-32
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51 checksum (an extension and improvement of the Fletcher checksum),
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52 used for detection of data corruption, and provides an algorithm for
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53 computing it.
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58 Deutsch & Gailly Informational [Page 1]
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60 RFC 1950 ZLIB Compressed Data Format Specification May 1996
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63 Table of Contents
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64
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65 1. Introduction ................................................... 2
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66 1.1. Purpose ................................................... 2
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67 1.2. Intended audience ......................................... 3
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68 1.3. Scope ..................................................... 3
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69 1.4. Compliance ................................................ 3
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70 1.5. Definitions of terms and conventions used ................ 3
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71 1.6. Changes from previous versions ............................ 3
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72 2. Detailed specification ......................................... 3
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73 2.1. Overall conventions ....................................... 3
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74 2.2. Data format ............................................... 4
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75 2.3. Compliance ................................................ 7
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76 3. References ..................................................... 7
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77 4. Source code .................................................... 8
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78 5. Security Considerations ........................................ 8
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79 6. Acknowledgements ............................................... 8
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80 7. Authors' Addresses ............................................. 8
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81 8. Appendix: Rationale ............................................ 9
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82 9. Appendix: Sample code ..........................................10
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84 1. Introduction
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86 1.1. Purpose
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87
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88 The purpose of this specification is to define a lossless
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89 compressed data format that:
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90
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91 * Is independent of CPU type, operating system, file system,
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92 and character set, and hence can be used for interchange;
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94 * Can be produced or consumed, even for an arbitrarily long
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95 sequentially presented input data stream, using only an a
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96 priori bounded amount of intermediate storage, and hence can
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97 be used in data communications or similar structures such as
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98 Unix filters;
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100 * Can use a number of different compression methods;
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102 * Can be implemented readily in a manner not covered by
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103 patents, and hence can be practiced freely.
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104
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105 The data format defined by this specification does not attempt to
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106 allow random access to compressed data.
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107
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108
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109
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110
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111
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112
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113
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114 Deutsch & Gailly Informational [Page 2]
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115
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116 RFC 1950 ZLIB Compressed Data Format Specification May 1996
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117
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118
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119 1.2. Intended audience
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120
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121 This specification is intended for use by implementors of software
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122 to compress data into zlib format and/or decompress data from zlib
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123 format.
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124
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125 The text of the specification assumes a basic background in
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126 programming at the level of bits and other primitive data
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127 representations.
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128
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129 1.3. Scope
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130
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131 The specification specifies a compressed data format that can be
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132 used for in-memory compression of a sequence of arbitrary bytes.
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133
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134 1.4. Compliance
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135
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136 Unless otherwise indicated below, a compliant decompressor must be
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137 able to accept and decompress any data set that conforms to all
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138 the specifications presented here; a compliant compressor must
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139 produce data sets that conform to all the specifications presented
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140 here.
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141
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142 1.5. Definitions of terms and conventions used
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143
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144 byte: 8 bits stored or transmitted as a unit (same as an octet).
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145 (For this specification, a byte is exactly 8 bits, even on
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146 machines which store a character on a number of bits different
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147 from 8.) See below, for the numbering of bits within a byte.
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148
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149 1.6. Changes from previous versions
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150
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151 Version 3.1 was the first public release of this specification.
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152 In version 3.2, some terminology was changed and the Adler-32
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153 sample code was rewritten for clarity. In version 3.3, the
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154 support for a preset dictionary was introduced, and the
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155 specification was converted to RFC style.
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156
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157 2. Detailed specification
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158
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159 2.1. Overall conventions
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160
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161 In the diagrams below, a box like this:
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162
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163 +---+
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164 | | <-- the vertical bars might be missing
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165 +---+
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166
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167
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168
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169
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170 Deutsch & Gailly Informational [Page 3]
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171
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172 RFC 1950 ZLIB Compressed Data Format Specification May 1996
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173
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174
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175 represents one byte; a box like this:
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176
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177 +==============+
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178 | |
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179 +==============+
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180
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181 represents a variable number of bytes.
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182
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183 Bytes stored within a computer do not have a "bit order", since
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184 they are always treated as a unit. However, a byte considered as
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185 an integer between 0 and 255 does have a most- and least-
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186 significant bit, and since we write numbers with the most-
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187 significant digit on the left, we also write bytes with the most-
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188 significant bit on the left. In the diagrams below, we number the
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189 bits of a byte so that bit 0 is the least-significant bit, i.e.,
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190 the bits are numbered:
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191
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192 +--------+
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193 |76543210|
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194 +--------+
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195
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196 Within a computer, a number may occupy multiple bytes. All
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197 multi-byte numbers in the format described here are stored with
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198 the MOST-significant byte first (at the lower memory address).
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199 For example, the decimal number 520 is stored as:
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200
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201 0 1
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202 +--------+--------+
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203 |00000010|00001000|
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204 +--------+--------+
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205 ^ ^
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206 | |
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207 | + less significant byte = 8
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208 + more significant byte = 2 x 256
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209
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210 2.2. Data format
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211
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212 A zlib stream has the following structure:
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213
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parents:
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214 0 1
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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215 +---+---+
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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216 |CMF|FLG| (more-->)
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Franz Glasner <fzglas.hg@dom66.de>
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217 +---+---+
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218
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219
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220
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221
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222
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223
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224
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225
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226 Deutsch & Gailly Informational [Page 4]
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227
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228 RFC 1950 ZLIB Compressed Data Format Specification May 1996
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229
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230
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231 (if FLG.FDICT set)
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232
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233 0 1 2 3
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234 +---+---+---+---+
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Franz Glasner <fzglas.hg@dom66.de>
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235 | DICTID | (more-->)
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236 +---+---+---+---+
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237
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238 +=====================+---+---+---+---+
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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239 |...compressed data...| ADLER32 |
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
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240 +=====================+---+---+---+---+
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241
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242 Any data which may appear after ADLER32 are not part of the zlib
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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243 stream.
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244
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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245 CMF (Compression Method and flags)
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parents:
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246 This byte is divided into a 4-bit compression method and a 4-
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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247 bit information field depending on the compression method.
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248
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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249 bits 0 to 3 CM Compression method
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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250 bits 4 to 7 CINFO Compression info
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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251
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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252 CM (Compression method)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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253 This identifies the compression method used in the file. CM = 8
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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254 denotes the "deflate" compression method with a window size up
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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255 to 32K. This is the method used by gzip and PNG (see
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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256 references [1] and [2] in Chapter 3, below, for the reference
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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257 documents). CM = 15 is reserved. It might be used in a future
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parents:
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258 version of this specification to indicate the presence of an
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Franz Glasner <fzglas.hg@dom66.de>
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259 extra field before the compressed data.
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260
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parents:
diff changeset
261 CINFO (Compression info)
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parents:
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262 For CM = 8, CINFO is the base-2 logarithm of the LZ77 window
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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263 size, minus eight (CINFO=7 indicates a 32K window size). Values
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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264 of CINFO above 7 are not allowed in this version of the
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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265 specification. CINFO is not defined in this specification for
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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266 CM not equal to 8.
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parents:
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267
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
268 FLG (FLaGs)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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269 This flag byte is divided as follows:
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270
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
271 bits 0 to 4 FCHECK (check bits for CMF and FLG)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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272 bit 5 FDICT (preset dictionary)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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273 bits 6 to 7 FLEVEL (compression level)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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274
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
275 The FCHECK value must be such that CMF and FLG, when viewed as
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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276 a 16-bit unsigned integer stored in MSB order (CMF*256 + FLG),
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
277 is a multiple of 31.
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278
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279
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parents:
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280
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parents:
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281
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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282 Deutsch & Gailly Informational [Page 5]
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parents:
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283
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
284 RFC 1950 ZLIB Compressed Data Format Specification May 1996
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parents:
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285
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parents:
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286
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
287 FDICT (Preset dictionary)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
288 If FDICT is set, a DICT dictionary identifier is present
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
289 immediately after the FLG byte. The dictionary is a sequence of
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
290 bytes which are initially fed to the compressor without
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
291 producing any compressed output. DICT is the Adler-32 checksum
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
292 of this sequence of bytes (see the definition of ADLER32
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
293 below). The decompressor can use this identifier to determine
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
294 which dictionary has been used by the compressor.
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295
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
296 FLEVEL (Compression level)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
297 These flags are available for use by specific compression
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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298 methods. The "deflate" method (CM = 8) sets these flags as
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
299 follows:
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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300
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
301 0 - compressor used fastest algorithm
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
302 1 - compressor used fast algorithm
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
303 2 - compressor used default algorithm
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
304 3 - compressor used maximum compression, slowest algorithm
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
305
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
306 The information in FLEVEL is not needed for decompression; it
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
307 is there to indicate if recompression might be worthwhile.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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308
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
309 compressed data
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
310 For compression method 8, the compressed data is stored in the
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311 deflate compressed data format as described in the document
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312 "DEFLATE Compressed Data Format Specification" by L. Peter
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313 Deutsch. (See reference [3] in Chapter 3, below)
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314
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315 Other compressed data formats are not specified in this version
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316 of the zlib specification.
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317
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318 ADLER32 (Adler-32 checksum)
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319 This contains a checksum value of the uncompressed data
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320 (excluding any dictionary data) computed according to Adler-32
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321 algorithm. This algorithm is a 32-bit extension and improvement
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322 of the Fletcher algorithm, used in the ITU-T X.224 / ISO 8073
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323 standard. See references [4] and [5] in Chapter 3, below)
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324
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325 Adler-32 is composed of two sums accumulated per byte: s1 is
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326 the sum of all bytes, s2 is the sum of all s1 values. Both sums
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327 are done modulo 65521. s1 is initialized to 1, s2 to zero. The
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328 Adler-32 checksum is stored as s2*65536 + s1 in most-
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329 significant-byte first (network) order.
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330
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331
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332
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333
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334
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335
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336
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337
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338 Deutsch & Gailly Informational [Page 6]
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339
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340 RFC 1950 ZLIB Compressed Data Format Specification May 1996
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341
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342
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343 2.3. Compliance
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344
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345 A compliant compressor must produce streams with correct CMF, FLG
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346 and ADLER32, but need not support preset dictionaries. When the
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347 zlib data format is used as part of another standard data format,
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348 the compressor may use only preset dictionaries that are specified
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349 by this other data format. If this other format does not use the
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350 preset dictionary feature, the compressor must not set the FDICT
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351 flag.
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352
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353 A compliant decompressor must check CMF, FLG, and ADLER32, and
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354 provide an error indication if any of these have incorrect values.
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355 A compliant decompressor must give an error indication if CM is
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356 not one of the values defined in this specification (only the
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357 value 8 is permitted in this version), since another value could
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358 indicate the presence of new features that would cause subsequent
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359 data to be interpreted incorrectly. A compliant decompressor must
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360 give an error indication if FDICT is set and DICTID is not the
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361 identifier of a known preset dictionary. A decompressor may
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362 ignore FLEVEL and still be compliant. When the zlib data format
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363 is being used as a part of another standard format, a compliant
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364 decompressor must support all the preset dictionaries specified by
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365 the other format. When the other format does not use the preset
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366 dictionary feature, a compliant decompressor must reject any
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367 stream in which the FDICT flag is set.
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368
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369 3. References
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370
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371 [1] Deutsch, L.P.,"GZIP Compressed Data Format Specification",
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372 available in ftp://ftp.uu.net/pub/archiving/zip/doc/
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373
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374 [2] Thomas Boutell, "PNG (Portable Network Graphics) specification",
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375 available in ftp://ftp.uu.net/graphics/png/documents/
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376
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377 [3] Deutsch, L.P.,"DEFLATE Compressed Data Format Specification",
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378 available in ftp://ftp.uu.net/pub/archiving/zip/doc/
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379
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380 [4] Fletcher, J. G., "An Arithmetic Checksum for Serial
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381 Transmissions," IEEE Transactions on Communications, Vol. COM-30,
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Franz Glasner <fzglas.hg@dom66.de>
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382 No. 1, January 1982, pp. 247-252.
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383
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parents:
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384 [5] ITU-T Recommendation X.224, Annex D, "Checksum Algorithms,"
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Franz Glasner <fzglas.hg@dom66.de>
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385 November, 1993, pp. 144, 145. (Available from
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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386 gopher://info.itu.ch). ITU-T X.244 is also the same as ISO 8073.
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387
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388
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389
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390
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391
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392
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393
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394 Deutsch & Gailly Informational [Page 7]
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395
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parents:
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396 RFC 1950 ZLIB Compressed Data Format Specification May 1996
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397
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parents:
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398
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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399 4. Source code
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400
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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401 Source code for a C language implementation of a "zlib" compliant
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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402 library is available at ftp://ftp.uu.net/pub/archiving/zip/zlib/.
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parents:
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403
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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404 5. Security Considerations
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parents:
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405
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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406 A decoder that fails to check the ADLER32 checksum value may be
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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407 subject to undetected data corruption.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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408
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parents:
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409 6. Acknowledgements
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410
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parents:
diff changeset
411 Trademarks cited in this document are the property of their
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
412 respective owners.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
413
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
414 Jean-Loup Gailly and Mark Adler designed the zlib format and wrote
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
415 the related software described in this specification. Glenn
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
416 Randers-Pehrson converted this document to RFC and HTML format.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
417
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
418 7. Authors' Addresses
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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419
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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420 L. Peter Deutsch
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
421 Aladdin Enterprises
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
422 203 Santa Margarita Ave.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
423 Menlo Park, CA 94025
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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424
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
425 Phone: (415) 322-0103 (AM only)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
426 FAX: (415) 322-1734
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
427 EMail: <ghost@aladdin.com>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
428
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
429
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
430 Jean-Loup Gailly
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
431
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
432 EMail: <gzip@prep.ai.mit.edu>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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433
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
434 Questions about the technical content of this specification can be
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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435 sent by email to
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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436
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
437 Jean-Loup Gailly <gzip@prep.ai.mit.edu> and
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
438 Mark Adler <madler@alumni.caltech.edu>
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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439
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
440 Editorial comments on this specification can be sent by email to
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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441
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
442 L. Peter Deutsch <ghost@aladdin.com> and
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
443 Glenn Randers-Pehrson <randeg@alumni.rpi.edu>
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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444
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
445
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
446
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
447
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
448
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
449
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
450 Deutsch & Gailly Informational [Page 8]
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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451
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
452 RFC 1950 ZLIB Compressed Data Format Specification May 1996
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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453
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
454
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
455 8. Appendix: Rationale
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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456
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
457 8.1. Preset dictionaries
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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458
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
459 A preset dictionary is specially useful to compress short input
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
460 sequences. The compressor can take advantage of the dictionary
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
461 context to encode the input in a more compact manner. The
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
462 decompressor can be initialized with the appropriate context by
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
463 virtually decompressing a compressed version of the dictionary
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
464 without producing any output. However for certain compression
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
465 algorithms such as the deflate algorithm this operation can be
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
466 achieved without actually performing any decompression.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
467
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
468 The compressor and the decompressor must use exactly the same
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
469 dictionary. The dictionary may be fixed or may be chosen among a
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
470 certain number of predefined dictionaries, according to the kind
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
471 of input data. The decompressor can determine which dictionary has
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
472 been chosen by the compressor by checking the dictionary
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
473 identifier. This document does not specify the contents of
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
474 predefined dictionaries, since the optimal dictionaries are
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
475 application specific. Standard data formats using this feature of
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
476 the zlib specification must precisely define the allowed
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
477 dictionaries.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
478
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
479 8.2. The Adler-32 algorithm
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
480
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
481 The Adler-32 algorithm is much faster than the CRC32 algorithm yet
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
482 still provides an extremely low probability of undetected errors.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
483
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
484 The modulo on unsigned long accumulators can be delayed for 5552
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
485 bytes, so the modulo operation time is negligible. If the bytes
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
486 are a, b, c, the second sum is 3a + 2b + c + 3, and so is position
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
487 and order sensitive, unlike the first sum, which is just a
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
488 checksum. That 65521 is prime is important to avoid a possible
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
489 large class of two-byte errors that leave the check unchanged.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
490 (The Fletcher checksum uses 255, which is not prime and which also
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
491 makes the Fletcher check insensitive to single byte changes 0 <->
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
492 255.)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
493
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
494 The sum s1 is initialized to 1 instead of zero to make the length
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
495 of the sequence part of s2, so that the length does not have to be
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
496 checked separately. (Any sequence of zeroes has a Fletcher
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
497 checksum of zero.)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
498
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
499
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
500
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
501
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
502
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
503
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
504
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
505
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
506 Deutsch & Gailly Informational [Page 9]
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
507
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
508 RFC 1950 ZLIB Compressed Data Format Specification May 1996
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
509
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
510
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
511 9. Appendix: Sample code
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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512
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
513 The following C code computes the Adler-32 checksum of a data buffer.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
514 It is written for clarity, not for speed. The sample code is in the
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
515 ANSI C programming language. Non C users may find it easier to read
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
516 with these hints:
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
517
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
518 & Bitwise AND operator.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
519 >> Bitwise right shift operator. When applied to an
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
520 unsigned quantity, as here, right shift inserts zero bit(s)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
521 at the left.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
522 << Bitwise left shift operator. Left shift inserts zero
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
523 bit(s) at the right.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
524 ++ "n++" increments the variable n.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
525 % modulo operator: a % b is the remainder of a divided by b.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
526
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
527 #define BASE 65521 /* largest prime smaller than 65536 */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
528
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
529 /*
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
530 Update a running Adler-32 checksum with the bytes buf[0..len-1]
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
531 and return the updated checksum. The Adler-32 checksum should be
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
532 initialized to 1.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
533
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
534 Usage example:
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
535
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
536 unsigned long adler = 1L;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
537
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
538 while (read_buffer(buffer, length) != EOF) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
539 adler = update_adler32(adler, buffer, length);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
540 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
541 if (adler != original_adler) error();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
542 */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
543 unsigned long update_adler32(unsigned long adler,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
544 unsigned char *buf, int len)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
545 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
546 unsigned long s1 = adler & 0xffff;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
547 unsigned long s2 = (adler >> 16) & 0xffff;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
548 int n;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
549
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
550 for (n = 0; n < len; n++) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
551 s1 = (s1 + buf[n]) % BASE;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
552 s2 = (s2 + s1) % BASE;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
553 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
554 return (s2 << 16) + s1;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
555 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
556
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
557 /* Return the adler32 of the bytes buf[0..len-1] */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
558
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
559
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
560
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
561
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
562 Deutsch & Gailly Informational [Page 10]
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
563
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
564 RFC 1950 ZLIB Compressed Data Format Specification May 1996
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
565
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
566
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
567 unsigned long adler32(unsigned char *buf, int len)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
568 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
569 return update_adler32(1L, buf, len);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
570 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
571
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
572
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
573
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
574
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
575
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
576
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
577
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
578
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
579
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
580
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
581
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
582
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
583
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
584
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
585
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
586
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
587
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
588
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
589
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
590
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
591
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
592
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
593
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
594
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
595
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
596
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
597
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
598
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
599
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
600
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
601
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
602
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
603
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
604
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
605
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
606
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
607
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
608
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
609
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
610
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
611
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
612
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
613
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
614
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
615
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
616
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
617
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
618 Deutsch & Gailly Informational [Page 11]
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
619