Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/curl_mime_data_cb.3 @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
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1 .\" **************************************************************************
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2 .\" * _ _ ____ _
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3 .\" * Project ___| | | | _ \| |
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4 .\" * / __| | | | |_) | |
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5 .\" * | (__| |_| | _ <| |___
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6 .\" * \___|\___/|_| \_\_____|
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7 .\" *
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8 .\" * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 .\" *
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10 .\" * This software is licensed as described in the file COPYING, which
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11 .\" * you should have received as part of this distribution. The terms
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12 .\" * are also available at https://curl.haxx.se/docs/copyright.html.
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13 .\" *
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14 .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 .\" * copies of the Software, and permit persons to whom the Software is
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16 .\" * furnished to do so, under the terms of the COPYING file.
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17 .\" *
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18 .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 .\" * KIND, either express or implied.
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20 .\" *
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21 .\" **************************************************************************
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22 .TH curl_mime_data_cb 3 "22 August 2017" "libcurl 7.56.0" "libcurl Manual"
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23 .SH NAME
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24 curl_mime_data_cb - set a callback-based data source for a mime part's body
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25 .SH SYNOPSIS
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26 .B #include <curl/curl.h>
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27 .sp
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28 size_t readfunc(char *buffer, size_t size, size_t nitems, void *arg);
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29 .br
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30 int seekfunc(void *arg, curl_off_t offset, int origin);
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31 .br
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32 void freefunc(void *arg);
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33 .sp
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34 .BI "CURLcode curl_mime_data_cb(curl_mimepart * " part ", curl_off_t " datasize ,
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35 .br
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36 .BI " curl_read_callback " readfunc ", curl_seek_callback " seekfunc ,
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37 .br
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38 .BI " curl_free_callback " freefunc ", void * " arg ");"
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39 .ad
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40 .SH DESCRIPTION
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41 \fIcurl_mime_data_cb(3)\fP sets the data source of a mime part's body content
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42 from a data read callback function.
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43
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44 \fIpart\fP is the part's to assign contents to.
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45
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46 \fIreadfunc\fP is a pointer to a data read callback function, with a signature
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47 as shown by the above prototype. It may not be set to NULL.
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48
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49 \fIseekfunc\fP is a pointer to a seek callback function, with a signature as
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50 shown by the above prototype. This function will be used upon resending data
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51 (i.e.: after a redirect); this pointer may be set to NULL, in which case a
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52 resend is not possible.
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54 \fIfreefunc\fP is a pointer to a user resource freeing callback function, with
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55 a signature as shown by the above prototype. If no resource is to be freed, it
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56 may safely be set to NULL. This function will be called upon mime structure
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57 freeing.
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59 \fIarg\fP is a user defined argument to callback functions.
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61 The read callback function gets called by libcurl as soon as it needs to
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62 read data in order to send it to the peer - like if you ask it to upload or
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63 post data to the server. The data area pointed at by the pointer \fIbuffer\fP
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64 should be filled up with at most \fIsize\fP multiplied with \fInmemb\fP number
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65 of bytes by your function.
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66
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67 Your read function must then return the actual number of bytes that it stored
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68 in that memory area. Returning 0 will signal end-of-file to the library and
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69 cause it to stop the current transfer.
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70
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71 If you stop the current transfer by returning 0 "pre-maturely" (i.e. before the
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72 server expected it, like when you've said you will upload N bytes and you
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73 upload less than N bytes), you may experience that the server "hangs" waiting
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74 for the rest of the data that won't come.
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75
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76 The read callback may return \fICURL_READFUNC_ABORT\fP to stop the current
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77 operation immediately, resulting in a \fICURLE_ABORTED_BY_CALLBACK\fP error
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78 code from the transfer.
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80 The callback can return \fICURL_READFUNC_PAUSE\fP to cause reading from this
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81 connection to pause. See \fIcurl_easy_pause(3)\fP for further details.
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83 The seek function gets called by libcurl to rewind input stream data or to
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84 seek to a certain position. The function shall work like fseek(3) or lseek(3)
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85 and it gets SEEK_SET, SEEK_CUR or SEEK_END as argument for \fIorigin\fP,
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86 although libcurl currently only passes SEEK_SET.
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87
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88 The callback function must return \fICURL_SEEKFUNC_OK\fP on success,
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89 \fICURL_SEEKFUNC_FAIL\fP to cause the upload operation to fail or
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90 \fICURL_SEEKFUNC_CANTSEEK\fP to indicate that while the seek failed, libcurl
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91 is free to work around the problem if possible. The latter can sometimes be
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92 done by instead reading from the input or similar.
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94 Care must be taken if the part is bound to a curl easy handle that is later
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95 duplicated: the \fIarg\fP pointer argument is also duplicated, resulting in
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96 the pointed item to be shared between the original and the copied handle.
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97 In particular, special attention should be given to the \fIfreefunc\fP
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98 procedure code since it will be called twice with the same argument.
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99
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100 .SH AVAILABILITY
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101 As long as at least one of HTTP, SMTP or IMAP is enabled. Added in 7.56.0.
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102 .SH RETURN VALUE
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103 CURLE_OK or a CURL error code upon failure.
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104 .SH EXAMPLE
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105 Sending a huge data string will cause the same amount of memory to be
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106 allocated: to avoid overhead resources consumption, one might want to use a
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107 callback source to avoid data duplication. In this case, original data
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108 must be retained until after the transfer terminates.
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109 .nf
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110
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111 char hugedata[512000];
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112
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113 struct ctl {
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114 char *buffer;
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115 curl_off_t size;
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116 curl_off_t position;
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117 };
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118
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119 size_t read_callback(char *buffer, size_t size, size_t nitems, void *arg)
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120 {
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121 struct ctl *p = (struct ctl *) arg;
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122 curl_off_t sz = p->size - p->position;
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123
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124 nitems *= size;
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125 if(sz > nitems)
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126 sz = nitems;
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127 if(sz)
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128 memcpy(buffer, p->buffer + p->position, sz);
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129 p->position += sz;
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130 return sz;
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131 }
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132
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133 int seek_callback(void *arg, curl_off_t offset, int origin)
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134 {
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135 struct ctl *p = (struct ctl *) arg;
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136
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137 switch(origin) {
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138 case SEEK_END:
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139 offset += p->size;
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140 break;
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141 case SEEK_CUR:
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142 offset += p->position;
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143 break;
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144 }
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145
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146 if(offset < 0)
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147 return CURL_SEEKFUNC_FAIL;
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148 p->position = offset;
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149 return CURL_SEEKFUNC_OK;
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150 }
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151
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152 CURL *easy = curl_easy_init();
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153 curl_mime *mime = curl_mime_init(easy);
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154 curl_mimepart *part = curl_mime_addpart(mime);
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155 struct ctl hugectl;
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156
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157 hugectl.buffer = hugedata;
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158 hugectl.size = sizeof hugedata;
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159 hugectl.position = 0;
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160 curl_mime_data_cb(part, hugectl.size, read_callback, seek_callback, NULL,
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161 &hugectl);
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162
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163 .SH "SEE ALSO"
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164 .BR curl_mime_addpart "(3),"
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165 .BR curl_mime_data "(3),"
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166 .BR curl_mime_name "(3),"
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167 .BR curl_easy_duphandle "(3)"