Mercurial > hgrepos > Python2 > PyMuPDF

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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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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2 "http://www.w3.org/TR/html4/loose.dtd">
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3 <html>
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4 <head>
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5 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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6 <title>zlib Usage Example</title>
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7 <!-- Copyright (c) 2004-2023 Mark Adler. -->
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8 </head>
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9 <body bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#00A000">
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10 <h2 align="center"> zlib Usage Example </h2>
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11 We often get questions about how the <tt>deflate()</tt> and <tt>inflate()</tt> functions should be used.
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12 Users wonder when they should provide more input, when they should use more output,
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13 what to do with a <tt>Z_BUF_ERROR</tt>, how to make sure the process terminates properly, and
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14 so on. So for those who have read <tt>zlib.h</tt> (a few times), and
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15 would like further edification, below is an annotated example in C of simple routines to compress and decompress
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16 from an input file to an output file using <tt>deflate()</tt> and <tt>inflate()</tt> respectively. The
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17 annotations are interspersed between lines of the code. So please read between the lines.
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18 We hope this helps explain some of the intricacies of <em>zlib</em>.
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19 <p>
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20 Without further ado, here is the program <a href="zpipe.c"><tt>zpipe.c</tt></a>:
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21 <pre><b>
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22 /* zpipe.c: example of proper use of zlib's inflate() and deflate()
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23 Not copyrighted -- provided to the public domain
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24 Version 1.4 11 December 2005 Mark Adler */
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25
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26 /* Version history:
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27 1.0 30 Oct 2004 First version
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28 1.1 8 Nov 2004 Add void casting for unused return values
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29 Use switch statement for inflate() return values
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30 1.2 9 Nov 2004 Add assertions to document zlib guarantees
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31 1.3 6 Apr 2005 Remove incorrect assertion in inf()
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32 1.4 11 Dec 2005 Add hack to avoid MSDOS end-of-line conversions
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33 Avoid some compiler warnings for input and output buffers
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34 */
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35 </b></pre><!-- -->
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36 We now include the header files for the required definitions. From
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37 <tt>stdio.h</tt> we use <tt>fopen()</tt>, <tt>fread()</tt>, <tt>fwrite()</tt>,
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38 <tt>feof()</tt>, <tt>ferror()</tt>, and <tt>fclose()</tt> for file i/o, and
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39 <tt>fputs()</tt> for error messages. From <tt>string.h</tt> we use
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40 <tt>strcmp()</tt> for command line argument processing.
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41 From <tt>assert.h</tt> we use the <tt>assert()</tt> macro.
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42 From <tt>zlib.h</tt>
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43 we use the basic compression functions <tt>deflateInit()</tt>,
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44 <tt>deflate()</tt>, and <tt>deflateEnd()</tt>, and the basic decompression
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45 functions <tt>inflateInit()</tt>, <tt>inflate()</tt>, and
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46 <tt>inflateEnd()</tt>.
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47 <pre><b>
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48 #include &lt;stdio.h&gt;
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49 #include &lt;string.h&gt;
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50 #include &lt;assert.h&gt;
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51 #include "zlib.h"
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52 </b></pre><!-- -->
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53 This is an ugly hack required to avoid corruption of the input and output data on
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54 Windows/MS-DOS systems. Without this, those systems would assume that the input and output
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55 files are text, and try to convert the end-of-line characters from one standard to
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56 another. That would corrupt binary data, and in particular would render the compressed data unusable.
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57 This sets the input and output to binary which suppresses the end-of-line conversions.
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58 <tt>SET_BINARY_MODE()</tt> will be used later on <tt>stdin</tt> and <tt>stdout</tt>, at the beginning of <tt>main()</tt>.
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59 <pre><b>
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60 #if defined(MSDOS) || defined(OS2) || defined(WIN32) || defined(__CYGWIN__)
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61 # include &lt;fcntl.h&gt;
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62 # include &lt;io.h&gt;
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63 # define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
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64 #else
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65 # define SET_BINARY_MODE(file)
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66 #endif
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67 </b></pre><!-- -->
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68 <tt>CHUNK</tt> is simply the buffer size for feeding data to and pulling data
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69 from the <em>zlib</em> routines. Larger buffer sizes would be more efficient,
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70 especially for <tt>inflate()</tt>. If the memory is available, buffers sizes
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71 on the order of 128K or 256K bytes should be used.
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72 <pre><b>
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73 #define CHUNK 16384
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74 </b></pre><!-- -->
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75 The <tt>def()</tt> routine compresses data from an input file to an output file. The output data
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76 will be in the <em>zlib</em> format, which is different from the <em>gzip</em> or <em>zip</em>
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77 formats. The <em>zlib</em> format has a very small header of only two bytes to identify it as
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78 a <em>zlib</em> stream and to provide decoding information, and a four-byte trailer with a fast
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79 check value to verify the integrity of the uncompressed data after decoding.
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80 <pre><b>
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81 /* Compress from file source to file dest until EOF on source.
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82 def() returns Z_OK on success, Z_MEM_ERROR if memory could not be
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83 allocated for processing, Z_STREAM_ERROR if an invalid compression
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84 level is supplied, Z_VERSION_ERROR if the version of zlib.h and the
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85 version of the library linked do not match, or Z_ERRNO if there is
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86 an error reading or writing the files. */
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87 int def(FILE *source, FILE *dest, int level)
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88 {
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89 </b></pre>
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90 Here are the local variables for <tt>def()</tt>. <tt>ret</tt> will be used for <em>zlib</em>
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91 return codes. <tt>flush</tt> will keep track of the current flushing state for <tt>deflate()</tt>,
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92 which is either no flushing, or flush to completion after the end of the input file is reached.
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93 <tt>have</tt> is the amount of data returned from <tt>deflate()</tt>. The <tt>strm</tt> structure
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94 is used to pass information to and from the <em>zlib</em> routines, and to maintain the
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95 <tt>deflate()</tt> state. <tt>in</tt> and <tt>out</tt> are the input and output buffers for
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96 <tt>deflate()</tt>.
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97 <pre><b>
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98 int ret, flush;
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99 unsigned have;
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100 z_stream strm;
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101 unsigned char in[CHUNK];
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102 unsigned char out[CHUNK];
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103 </b></pre><!-- -->
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104 The first thing we do is to initialize the <em>zlib</em> state for compression using
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105 <tt>deflateInit()</tt>. This must be done before the first use of <tt>deflate()</tt>.
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106 The <tt>zalloc</tt>, <tt>zfree</tt>, and <tt>opaque</tt> fields in the <tt>strm</tt>
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107 structure must be initialized before calling <tt>deflateInit()</tt>. Here they are
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108 set to the <em>zlib</em> constant <tt>Z_NULL</tt> to request that <em>zlib</em> use
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109 the default memory allocation routines. An application may also choose to provide
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110 custom memory allocation routines here. <tt>deflateInit()</tt> will allocate on the
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111 order of 256K bytes for the internal state.
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112 (See <a href="zlib_tech.html"><em>zlib Technical Details</em></a>.)
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113 <p>
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114 <tt>deflateInit()</tt> is called with a pointer to the structure to be initialized and
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115 the compression level, which is an integer in the range of -1 to 9. Lower compression
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116 levels result in faster execution, but less compression. Higher levels result in
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117 greater compression, but slower execution. The <em>zlib</em> constant Z_DEFAULT_COMPRESSION,
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118 equal to -1,
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119 provides a good compromise between compression and speed and is equivalent to level 6.
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120 Level 0 actually does no compression at all, and in fact expands the data slightly to produce
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121 the <em>zlib</em> format (it is not a byte-for-byte copy of the input).
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122 More advanced applications of <em>zlib</em>
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123 may use <tt>deflateInit2()</tt> here instead. Such an application may want to reduce how
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124 much memory will be used, at some price in compression. Or it may need to request a
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125 <em>gzip</em> header and trailer instead of a <em>zlib</em> header and trailer, or raw
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126 encoding with no header or trailer at all.
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127 <p>
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128 We must check the return value of <tt>deflateInit()</tt> against the <em>zlib</em> constant
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129 <tt>Z_OK</tt> to make sure that it was able to
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130 allocate memory for the internal state, and that the provided arguments were valid.
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131 <tt>deflateInit()</tt> will also check that the version of <em>zlib</em> that the <tt>zlib.h</tt>
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132 file came from matches the version of <em>zlib</em> actually linked with the program. This
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133 is especially important for environments in which <em>zlib</em> is a shared library.
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134 <p>
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135 Note that an application can initialize multiple, independent <em>zlib</em> streams, which can
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136 operate in parallel. The state information maintained in the structure allows the <em>zlib</em>
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137 routines to be reentrant.
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138 <pre><b>
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139 /* allocate deflate state */
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140 strm.zalloc = Z_NULL;
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141 strm.zfree = Z_NULL;
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142 strm.opaque = Z_NULL;
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143 ret = deflateInit(&amp;strm, level);
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144 if (ret != Z_OK)
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145 return ret;
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146 </b></pre><!-- -->
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147 With the pleasantries out of the way, now we can get down to business. The outer <tt>do</tt>-loop
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148 reads all of the input file and exits at the bottom of the loop once end-of-file is reached.
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149 This loop contains the only call of <tt>deflate()</tt>. So we must make sure that all of the
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150 input data has been processed and that all of the output data has been generated and consumed
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151 before we fall out of the loop at the bottom.
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152 <pre><b>
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153 /* compress until end of file */
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154 do {
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155 </b></pre>
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156 We start off by reading data from the input file. The number of bytes read is put directly
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157 into <tt>avail_in</tt>, and a pointer to those bytes is put into <tt>next_in</tt>. We also
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158 check to see if end-of-file on the input has been reached using feof().
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159 If we are at the end of file, then <tt>flush</tt> is set to the
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160 <em>zlib</em> constant <tt>Z_FINISH</tt>, which is later passed to <tt>deflate()</tt> to
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161 indicate that this is the last chunk of input data to compress.
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162 If we are not yet at the end of the input, then the <em>zlib</em>
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163 constant <tt>Z_NO_FLUSH</tt> will be passed to <tt>deflate</tt> to indicate that we are still
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164 in the middle of the uncompressed data.
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165 <p>
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166 If there is an error in reading from the input file, the process is aborted with
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167 <tt>deflateEnd()</tt> being called to free the allocated <em>zlib</em> state before returning
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168 the error. We wouldn't want a memory leak, now would we? <tt>deflateEnd()</tt> can be called
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169 at any time after the state has been initialized. Once that's done, <tt>deflateInit()</tt> (or
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170 <tt>deflateInit2()</tt>) would have to be called to start a new compression process. There is
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171 no point here in checking the <tt>deflateEnd()</tt> return code. The deallocation can't fail.
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172 <pre><b>
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173 strm.avail_in = fread(in, 1, CHUNK, source);
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174 if (ferror(source)) {
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175 (void)deflateEnd(&amp;strm);
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176 return Z_ERRNO;
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177 }
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178 flush = feof(source) ? Z_FINISH : Z_NO_FLUSH;
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179 strm.next_in = in;
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180 </b></pre><!-- -->
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181 The inner <tt>do</tt>-loop passes our chunk of input data to <tt>deflate()</tt>, and then
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182 keeps calling <tt>deflate()</tt> until it is done producing output. Once there is no more
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183 new output, <tt>deflate()</tt> is guaranteed to have consumed all of the input, i.e.,
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184 <tt>avail_in</tt> will be zero.
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185 <pre><b>
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186 /* run deflate() on input until output buffer not full, finish
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187 compression if all of source has been read in */
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188 do {
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189 </b></pre>
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190 Output space is provided to <tt>deflate()</tt> by setting <tt>avail_out</tt> to the number
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191 of available output bytes and <tt>next_out</tt> to a pointer to that space.
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192 <pre><b>
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193 strm.avail_out = CHUNK;
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194 strm.next_out = out;
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195 </b></pre>
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196 Now we call the compression engine itself, <tt>deflate()</tt>. It takes as many of the
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197 <tt>avail_in</tt> bytes at <tt>next_in</tt> as it can process, and writes as many as
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198 <tt>avail_out</tt> bytes to <tt>next_out</tt>. Those counters and pointers are then
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199 updated past the input data consumed and the output data written. It is the amount of
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200 output space available that may limit how much input is consumed.
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201 Hence the inner loop to make sure that
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202 all of the input is consumed by providing more output space each time. Since <tt>avail_in</tt>
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203 and <tt>next_in</tt> are updated by <tt>deflate()</tt>, we don't have to mess with those
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204 between <tt>deflate()</tt> calls until it's all used up.
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205 <p>
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206 The parameters to <tt>deflate()</tt> are a pointer to the <tt>strm</tt> structure containing
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207 the input and output information and the internal compression engine state, and a parameter
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208 indicating whether and how to flush data to the output. Normally <tt>deflate</tt> will consume
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209 several K bytes of input data before producing any output (except for the header), in order
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210 to accumulate statistics on the data for optimum compression. It will then put out a burst of
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211 compressed data, and proceed to consume more input before the next burst. Eventually,
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212 <tt>deflate()</tt>
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213 must be told to terminate the stream, complete the compression with provided input data, and
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214 write out the trailer check value. <tt>deflate()</tt> will continue to compress normally as long
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215 as the flush parameter is <tt>Z_NO_FLUSH</tt>. Once the <tt>Z_FINISH</tt> parameter is provided,
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216 <tt>deflate()</tt> will begin to complete the compressed output stream. However depending on how
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217 much output space is provided, <tt>deflate()</tt> may have to be called several times until it
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218 has provided the complete compressed stream, even after it has consumed all of the input. The flush
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219 parameter must continue to be <tt>Z_FINISH</tt> for those subsequent calls.
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220 <p>
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221 There are other values of the flush parameter that are used in more advanced applications. You can
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222 force <tt>deflate()</tt> to produce a burst of output that encodes all of the input data provided
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223 so far, even if it wouldn't have otherwise, for example to control data latency on a link with
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224 compressed data. You can also ask that <tt>deflate()</tt> do that as well as erase any history up to
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225 that point so that what follows can be decompressed independently, for example for random access
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226 applications. Both requests will degrade compression by an amount depending on how often such
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227 requests are made.
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228 <p>
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229 <tt>deflate()</tt> has a return value that can indicate errors, yet we do not check it here. Why
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230 not? Well, it turns out that <tt>deflate()</tt> can do no wrong here. Let's go through
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231 <tt>deflate()</tt>'s return values and dispense with them one by one. The possible values are
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232 <tt>Z_OK</tt>, <tt>Z_STREAM_END</tt>, <tt>Z_STREAM_ERROR</tt>, or <tt>Z_BUF_ERROR</tt>. <tt>Z_OK</tt>
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233 is, well, ok. <tt>Z_STREAM_END</tt> is also ok and will be returned for the last call of
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234 <tt>deflate()</tt>. This is already guaranteed by calling <tt>deflate()</tt> with <tt>Z_FINISH</tt>
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235 until it has no more output. <tt>Z_STREAM_ERROR</tt> is only possible if the stream is not
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236 initialized properly, but we did initialize it properly. There is no harm in checking for
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237 <tt>Z_STREAM_ERROR</tt> here, for example to check for the possibility that some
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238 other part of the application inadvertently clobbered the memory containing the <em>zlib</em> state.
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239 <tt>Z_BUF_ERROR</tt> will be explained further below, but
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240 suffice it to say that this is simply an indication that <tt>deflate()</tt> could not consume
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241 more input or produce more output. <tt>deflate()</tt> can be called again with more output space
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242 or more available input, which it will be in this code.
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243 <pre><b>
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244 ret = deflate(&amp;strm, flush); /* no bad return value */
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245 assert(ret != Z_STREAM_ERROR); /* state not clobbered */
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246 </b></pre>
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247 Now we compute how much output <tt>deflate()</tt> provided on the last call, which is the
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248 difference between how much space was provided before the call, and how much output space
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249 is still available after the call. Then that data, if any, is written to the output file.
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250 We can then reuse the output buffer for the next call of <tt>deflate()</tt>. Again if there
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251 is a file i/o error, we call <tt>deflateEnd()</tt> before returning to avoid a memory leak.
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252 <pre><b>
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253 have = CHUNK - strm.avail_out;
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254 if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
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255 (void)deflateEnd(&amp;strm);
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256 return Z_ERRNO;
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257 }
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258 </b></pre>
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259 The inner <tt>do</tt>-loop is repeated until the last <tt>deflate()</tt> call fails to fill the
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260 provided output buffer. Then we know that <tt>deflate()</tt> has done as much as it can with
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261 the provided input, and that all of that input has been consumed. We can then fall out of this
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262 loop and reuse the input buffer.
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263 <p>
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264 The way we tell that <tt>deflate()</tt> has no more output is by seeing that it did not fill
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265 the output buffer, leaving <tt>avail_out</tt> greater than zero. However suppose that
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266 <tt>deflate()</tt> has no more output, but just so happened to exactly fill the output buffer!
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267 <tt>avail_out</tt> is zero, and we can't tell that <tt>deflate()</tt> has done all it can.
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268 As far as we know, <tt>deflate()</tt>
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269 has more output for us. So we call it again. But now <tt>deflate()</tt> produces no output
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270 at all, and <tt>avail_out</tt> remains unchanged as <tt>CHUNK</tt>. That <tt>deflate()</tt> call
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271 wasn't able to do anything, either consume input or produce output, and so it returns
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272 <tt>Z_BUF_ERROR</tt>. (See, I told you I'd cover this later.) However this is not a problem at
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273 all. Now we finally have the desired indication that <tt>deflate()</tt> is really done,
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274 and so we drop out of the inner loop to provide more input to <tt>deflate()</tt>.
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275 <p>
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276 With <tt>flush</tt> set to <tt>Z_FINISH</tt>, this final set of <tt>deflate()</tt> calls will
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277 complete the output stream. Once that is done, subsequent calls of <tt>deflate()</tt> would return
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278 <tt>Z_STREAM_ERROR</tt> if the flush parameter is not <tt>Z_FINISH</tt>, and do no more processing
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279 until the state is reinitialized.
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280 <p>
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281 Some applications of <em>zlib</em> have two loops that call <tt>deflate()</tt>
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282 instead of the single inner loop we have here. The first loop would call
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283 without flushing and feed all of the data to <tt>deflate()</tt>. The second loop would call
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284 <tt>deflate()</tt> with no more
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285 data and the <tt>Z_FINISH</tt> parameter to complete the process. As you can see from this
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286 example, that can be avoided by simply keeping track of the current flush state.
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287 <pre><b>
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288 } while (strm.avail_out == 0);
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289 assert(strm.avail_in == 0); /* all input will be used */
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290 </b></pre><!-- -->
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291 Now we check to see if we have already processed all of the input file. That information was
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292 saved in the <tt>flush</tt> variable, so we see if that was set to <tt>Z_FINISH</tt>. If so,
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293 then we're done and we fall out of the outer loop. We're guaranteed to get <tt>Z_STREAM_END</tt>
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294 from the last <tt>deflate()</tt> call, since we ran it until the last chunk of input was
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295 consumed and all of the output was generated.
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296 <pre><b>
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297 /* done when last data in file processed */
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298 } while (flush != Z_FINISH);
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299 assert(ret == Z_STREAM_END); /* stream will be complete */
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300 </b></pre><!-- -->
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301 The process is complete, but we still need to deallocate the state to avoid a memory leak
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302 (or rather more like a memory hemorrhage if you didn't do this). Then
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303 finally we can return with a happy return value.
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304 <pre><b>
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305 /* clean up and return */
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306 (void)deflateEnd(&amp;strm);
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307 return Z_OK;
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308 }
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309 </b></pre><!-- -->
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310 Now we do the same thing for decompression in the <tt>inf()</tt> routine. <tt>inf()</tt>
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311 decompresses what is hopefully a valid <em>zlib</em> stream from the input file and writes the
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312 uncompressed data to the output file. Much of the discussion above for <tt>def()</tt>
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313 applies to <tt>inf()</tt> as well, so the discussion here will focus on the differences between
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314 the two.
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315 <pre><b>
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316 /* Decompress from file source to file dest until stream ends or EOF.
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317 inf() returns Z_OK on success, Z_MEM_ERROR if memory could not be
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318 allocated for processing, Z_DATA_ERROR if the deflate data is
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319 invalid or incomplete, Z_VERSION_ERROR if the version of zlib.h and
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320 the version of the library linked do not match, or Z_ERRNO if there
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321 is an error reading or writing the files. */
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322 int inf(FILE *source, FILE *dest)
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323 {
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324 </b></pre>
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325 The local variables have the same functionality as they do for <tt>def()</tt>. The
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326 only difference is that there is no <tt>flush</tt> variable, since <tt>inflate()</tt>
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327 can tell from the <em>zlib</em> stream itself when the stream is complete.
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328 <pre><b>
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329 int ret;
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330 unsigned have;
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331 z_stream strm;
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332 unsigned char in[CHUNK];
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333 unsigned char out[CHUNK];
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334 </b></pre><!-- -->
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335 The initialization of the state is the same, except that there is no compression level,
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336 of course, and two more elements of the structure are initialized. <tt>avail_in</tt>
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337 and <tt>next_in</tt> must be initialized before calling <tt>inflateInit()</tt>. This
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338 is because the application has the option to provide the start of the zlib stream in
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339 order for <tt>inflateInit()</tt> to have access to information about the compression
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340 method to aid in memory allocation. In the current implementation of <em>zlib</em>
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341 (up through versions 1.2.x), the method-dependent memory allocations are deferred to the first call of
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342 <tt>inflate()</tt> anyway. However those fields must be initialized since later versions
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343 of <em>zlib</em> that provide more compression methods may take advantage of this interface.
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344 In any case, no decompression is performed by <tt>inflateInit()</tt>, so the
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345 <tt>avail_out</tt> and <tt>next_out</tt> fields do not need to be initialized before calling.
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346 <p>
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347 Here <tt>avail_in</tt> is set to zero and <tt>next_in</tt> is set to <tt>Z_NULL</tt> to
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348 indicate that no input data is being provided.
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349 <pre><b>
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350 /* allocate inflate state */
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351 strm.zalloc = Z_NULL;
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352 strm.zfree = Z_NULL;
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353 strm.opaque = Z_NULL;
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354 strm.avail_in = 0;
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355 strm.next_in = Z_NULL;
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356 ret = inflateInit(&amp;strm);
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357 if (ret != Z_OK)
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358 return ret;
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359 </b></pre><!-- -->
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360 The outer <tt>do</tt>-loop decompresses input until <tt>inflate()</tt> indicates
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361 that it has reached the end of the compressed data and has produced all of the uncompressed
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362 output. This is in contrast to <tt>def()</tt> which processes all of the input file.
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363 If end-of-file is reached before the compressed data self-terminates, then the compressed
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364 data is incomplete and an error is returned.
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365 <pre><b>
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366 /* decompress until deflate stream ends or end of file */
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367 do {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
368 </b></pre>
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
369 We read input data and set the <tt>strm</tt> structure accordingly. If we've reached 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
370 end of the input file, then we leave the outer loop and report an error, since 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
371 compressed data is incomplete. Note that we may read more data than is eventually consumed
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
372 by <tt>inflate()</tt>, if the input file continues past the <em>zlib</em> stream.
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
373 For applications where <em>zlib</em> streams are embedded in other data, this routine would
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
374 need to be modified to return the unused data, or at least indicate how much of the 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
375 data was not used, so the application would know where to pick up after the <em>zlib</em> stream.
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
376 <pre><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
377 strm.avail_in = fread(in, 1, CHUNK, source);
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
378 if (ferror(source)) {
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
379 (void)inflateEnd(&amp;strm);
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
380 return Z_ERRNO;
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
381 }
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
382 if (strm.avail_in == 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
383 break;
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
384 strm.next_in = in;
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
385 </b></pre><!-- -->
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
386 The inner <tt>do</tt>-loop has the same function it did in <tt>def()</tt>, which is 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:
diff changeset
387 keep calling <tt>inflate()</tt> until has generated all of the output it can with 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
388 provided 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
389 <pre><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
390 /* run inflate() on input until output buffer not full */
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
391 do {
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
392 </b></pre>
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
393 Just like in <tt>def()</tt>, the same output space is provided for each call of <tt>inflate()</tt>.
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
394 <pre><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
395 strm.avail_out = CHUNK;
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
396 strm.next_out = out;
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
397 </b></pre>
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
398 Now we run the decompression engine itself. There is no need to adjust the flush parameter, since
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
399 the <em>zlib</em> format is self-terminating. The main difference here is that there 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
400 return values that we need to pay attention to. <tt>Z_DATA_ERROR</tt>
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
401 indicates that <tt>inflate()</tt> detected an error in the <em>zlib</em> compressed data format,
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
402 which means that either the data is not a <em>zlib</em> stream to begin with, or that the data was
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
403 corrupted somewhere along the way since it was compressed. The other error to be processed is
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
404 <tt>Z_MEM_ERROR</tt>, which can occur since memory allocation is deferred until <tt>inflate()</tt>
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
405 needs it, unlike <tt>deflate()</tt>, whose memory is allocated at the start by <tt>deflateInit()</tt>.
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
406 <p>
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
407 Advanced applications may use
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
408 <tt>deflateSetDictionary()</tt> to prime <tt>deflate()</tt> with a set of likely data to improve 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
409 first 32K or so of compression. This is noted in the <em>zlib</em> header, so <tt>inflate()</tt>
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
410 requests that that dictionary be provided before it can start to decompress. Without 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
411 correct decompression is not possible. For this routine, we have no idea what the dictionary is,
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
412 so the <tt>Z_NEED_DICT</tt> indication is converted to a <tt>Z_DATA_ERROR</tt>.
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 <p>
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
414 <tt>inflate()</tt> can also return <tt>Z_STREAM_ERROR</tt>, which should not be possible here,
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 but could be checked for as noted above for <tt>def()</tt>. <tt>Z_BUF_ERROR</tt> does not need 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
416 checked for here, for the same reasons noted for <tt>def()</tt>. <tt>Z_STREAM_END</tt> will 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
417 checked for later.
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
418 <pre><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
419 ret = inflate(&amp;strm, Z_NO_FLUSH);
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
420 assert(ret != Z_STREAM_ERROR); /* state not clobbered */
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 switch (ret) {
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 case Z_NEED_DICT:
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 ret = Z_DATA_ERROR; /* and fall through */
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
424 case Z_DATA_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
425 case Z_MEM_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
426 (void)inflateEnd(&amp;strm);
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 return ret;
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 </b></pre>
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 The output of <tt>inflate()</tt> is handled identically to that of <tt>deflate()</tt>.
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 <pre><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
432 have = CHUNK - strm.avail_out;
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
433 if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
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
434 (void)inflateEnd(&amp;strm);
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
435 return Z_ERRNO;
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
436 }
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
437 </b></pre>
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 The inner <tt>do</tt>-loop ends when <tt>inflate()</tt> has no more output as indicated
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
439 by not filling the output buffer, just as for <tt>deflate()</tt>. In this case, we cannot
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
440 assert that <tt>strm.avail_in</tt> will be zero, since the deflate stream may end before the file
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
441 does.
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
442 <pre><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
443 } while (strm.avail_out == 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
444 </b></pre><!-- -->
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
445 The outer <tt>do</tt>-loop ends when <tt>inflate()</tt> reports that it has reached 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
446 end of the input <em>zlib</em> stream, has completed the decompression and integrity
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 check, and has provided all of the output. This is indicated by the <tt>inflate()</tt>
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 return value <tt>Z_STREAM_END</tt>. The inner loop is guaranteed to leave <tt>ret</tt>
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 equal to <tt>Z_STREAM_END</tt> if the last chunk of the input file read contained the end
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 of the <em>zlib</em> stream. So if the return value is not <tt>Z_STREAM_END</tt>, 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
451 loop continues to read more 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
452 <pre><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
453 /* done when inflate() says it's done */
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
454 } while (ret != Z_STREAM_END);
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 </b></pre><!-- -->
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
456 At this point, decompression successfully completed, or we broke out of the loop due to no
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
457 more data being available from the input file. If the last <tt>inflate()</tt> return value
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
458 is not <tt>Z_STREAM_END</tt>, then the <em>zlib</em> stream was incomplete and a data 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
459 is returned. Otherwise, we return with a happy return value. Of course, <tt>inflateEnd()</tt>
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 is called first to avoid a memory leak.
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 <pre><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
462 /* clean up and return */
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 (void)inflateEnd(&amp;strm);
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 return ret == Z_STREAM_END ? Z_OK : Z_DATA_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
465 }
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 </b></pre><!-- -->
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
467 That ends the routines that directly use <em>zlib</em>. The following routines make this
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
468 a command-line program by running data through the above routines from <tt>stdin</tt> 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:
diff changeset
469 <tt>stdout</tt>, and handling any errors reported by <tt>def()</tt> or <tt>inf()</tt>.
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 <p>
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 <tt>zerr()</tt> is used to interpret the possible error codes from <tt>def()</tt>
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 and <tt>inf()</tt>, as detailed in their comments above, and print out an error message.
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 Note that these are only a subset of the possible return values from <tt>deflate()</tt>
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 and <tt>inflate()</tt>.
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 <pre><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
476 /* report a zlib or i/o 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
477 void zerr(int ret)
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 {
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
479 fputs("zpipe: ", stderr);
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 switch (ret) {
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
481 case Z_ERRNO:
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 if (ferror(stdin))
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 fputs("error reading stdin\n", stderr);
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
484 if (ferror(stdout))
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 fputs("error writing stdout\n", stderr);
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 break;
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 case Z_STREAM_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
488 fputs("invalid compression level\n", stderr);
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 break;
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 case Z_DATA_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
491 fputs("invalid or incomplete deflate data\n", stderr);
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 break;
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 case Z_MEM_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
494 fputs("out of memory\n", stderr);
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 break;
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 case Z_VERSION_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
497 fputs("zlib version mismatch!\n", stderr);
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 </b></pre><!-- -->
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 Here is the <tt>main()</tt> routine used to test <tt>def()</tt> and <tt>inf()</tt>. 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
502 <tt>zpipe</tt> command is simply a compression pipe from <tt>stdin</tt> to <tt>stdout</tt>, if
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 no arguments are given, or it is a decompression pipe if <tt>zpipe -d</tt> is used. If any other
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 arguments are provided, no compression or decompression is performed. Instead a usage
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 message is displayed. Examples are <tt>zpipe < foo.txt > foo.txt.z</tt> to compress, 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
506 <tt>zpipe -d < foo.txt.z > foo.txt</tt> to decompress.
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
507 <pre><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
508 /* compress or decompress from stdin to stdout */
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 int main(int argc, char **argv)
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 int ret;
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
512
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
513 /* avoid end-of-line conversions */
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 SET_BINARY_MODE(stdin);
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 SET_BINARY_MODE(stdout);
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
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 /* do compression if no arguments */
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 if (argc == 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
519 ret = def(stdin, stdout, Z_DEFAULT_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
520 if (ret != Z_OK)
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 zerr(ret);
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 return ret;
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 }
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
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 /* do decompression if -d specified */
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 else if (argc == 2 &amp;&amp; strcmp(argv[1], "-d") == 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
527 ret = inf(stdin, stdout);
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 if (ret != Z_OK)
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 zerr(ret);
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 return ret;
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 }
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
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 /* otherwise, report usage */
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 else {
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 fputs("zpipe usage: zpipe [-d] &lt; source &gt; dest\n", stderr);
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 return 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
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 }
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 </b></pre>
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 <hr>
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 <i>Last modified 24 January 2023<br>
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 Copyright &#169; 2004-2023 Mark Adler</i><br>
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 <a rel="license" href="http://creativecommons.org/licenses/by-nd/4.0/">
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
544 <img alt="Creative Commons License" style="border-width: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
545 src="https://i.creativecommons.org/l/by-nd/4.0/88x31.png"></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
546 <a rel="license" href="http://creativecommons.org/licenses/by-nd/4.0/">
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
547 Creative Commons Attribution-NoDerivatives 4.0 International License</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
548 </body>
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 </html>