Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_READFUNCTION.3 @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
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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 - 2019, 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 .\"
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23 .TH CURLOPT_READFUNCTION 3 "16 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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24 .SH NAME
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25 CURLOPT_READFUNCTION \- read callback for data uploads
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26 .SH SYNOPSIS
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27 #include <curl/curl.h>
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29 size_t read_callback(char *buffer, size_t size, size_t nitems, void *userdata);
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31 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_READFUNCTION, read_callback);
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32
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33 .SH DESCRIPTION
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34 Pass a pointer to your callback function, as the prototype shows above.
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36 This callback function gets called by libcurl as soon as it needs to read data
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37 in order to send it to the peer - like if you ask it to upload or post data to
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38 the server. The data area pointed at by the pointer \fIbuffer\fP should be
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39 filled up with at most \fIsize\fP multiplied with \fInitems\fP number of bytes
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40 by your function.
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42 Set the \fIuserdata\fP argument with the \fICURLOPT_READDATA(3)\fP option.
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44 Your function must return the actual number of bytes that it stored in the data
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45 area pointed at by the pointer \fIbuffer\fP. Returning 0 will signal
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46 end-of-file to the library and cause it to stop the current transfer.
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48 If you stop the current transfer by returning 0 "pre-maturely" (i.e before the
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49 server expected it, like when you've said you will upload N bytes and you
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50 upload less than N bytes), you may experience that the server "hangs" waiting
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51 for the rest of the data that won't come.
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53 The read callback may return \fICURL_READFUNC_ABORT\fP to stop the current
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54 operation immediately, resulting in a \fICURLE_ABORTED_BY_CALLBACK\fP error
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55 code from the transfer.
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57 The callback can return \fICURL_READFUNC_PAUSE\fP to cause reading from this
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58 connection to pause. See \fIcurl_easy_pause(3)\fP for further details.
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60 \fBBugs\fP: when doing TFTP uploads, you must return the exact amount of data
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61 that the callback wants, or it will be considered the final packet by the
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62 server end and the transfer will end there.
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64 If you set this callback pointer to NULL, or don't set it at all, the default
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65 internal read function will be used. It is doing an fread() on the FILE *
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66 userdata set with \fICURLOPT_READDATA(3)\fP.
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67 .SH DEFAULT
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68 The default internal read callback is fread().
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69 .SH PROTOCOLS
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70 This is used for all protocols when doing uploads.
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71 .SH EXAMPLE
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72 .nf
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73 size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userdata)
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74 {
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75 FILE *readhere = (FILE *)userdata;
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76 curl_off_t nread;
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78 /* copy as much data as possible into the 'ptr' buffer, but no more than
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79 'size' * 'nmemb' bytes! */
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80 size_t retcode = fread(ptr, size, nmemb, readhere);
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82 nread = (curl_off_t)retcode;
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83
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84 fprintf(stderr, "*** We read %" CURL_FORMAT_CURL_OFF_T
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85 " bytes from file\\n", nread);
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86 return retcode;
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87 }
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88
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89 void setup(char *uploadthis)
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90 {
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91 FILE *file = fopen("rb", uploadthis);
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92 CURLcode result;
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94 /* set callback to use */
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95 curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
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96
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97 /* pass in suitable argument to callback */
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98 curl_easy_setopt(curl, CURLOPT_READDATA, uploadthis);
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99
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100 result = curl_easy_perform(curl);
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101 }
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102 .fi
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103 .SH AVAILABILITY
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104 CURL_READFUNC_PAUSE return code was added in 7.18.0 and CURL_READFUNC_ABORT
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105 was added in 7.12.1.
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106 .SH RETURN VALUE
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107 This will return CURLE_OK.
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108 .SH "SEE ALSO"
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109 .BR CURLOPT_READDATA "(3), " CURLOPT_WRITEFUNCTION "(3), "
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110 .BR CURLOPT_SEEKFUNCTION "(3), " CURLOPT_UPLOAD "(3), " CURLOPT_POST "(3), "
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111 .BR CURLOPT_UPLOAD_BUFFERSIZE "(3), "