Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/src/tool_cb_see.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +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 - 2012, 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 #include "tool_setup.h"
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24 #define ENABLE_CURLX_PRINTF
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25 /* use our own printf() functions */
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26 #include "curlx.h"
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28 #include "tool_cfgable.h"
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29 #include "tool_cb_see.h"
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31 #include "memdebug.h" /* keep this as LAST include */
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33 /* OUR_MAX_SEEK_L has 'long' data type, OUR_MAX_SEEK_O has 'curl_off_t,
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34 both represent the same value. Maximum offset used here when we lseek
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35 using a 'long' data type offset */
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37 #define OUR_MAX_SEEK_L 2147483647L - 1L
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38 #define OUR_MAX_SEEK_O CURL_OFF_T_C(0x7FFFFFFF) - CURL_OFF_T_C(0x1)
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40 /*
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41 ** callback for CURLOPT_SEEKFUNCTION
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42 **
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43 ** Notice that this is not supposed to return the resulting offset. This
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44 ** shall only return CURL_SEEKFUNC_* return codes.
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45 */
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47 int tool_seek_cb(void *userdata, curl_off_t offset, int whence)
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48 {
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49 struct InStruct *in = userdata;
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51 #if(CURL_SIZEOF_CURL_OFF_T > SIZEOF_OFF_T) && !defined(USE_WIN32_LARGE_FILES)
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53 /* The offset check following here is only interesting if curl_off_t is
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54 larger than off_t and we are not using the WIN32 large file support
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55 macros that provide the support to do 64bit seeks correctly */
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57 if(offset > OUR_MAX_SEEK_O) {
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58 /* Some precaution code to work around problems with different data sizes
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59 to allow seeking >32bit even if off_t is 32bit. Should be very rare and
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60 is really valid on weirdo-systems. */
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61 curl_off_t left = offset;
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62
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63 if(whence != SEEK_SET)
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64 /* this code path doesn't support other types */
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65 return CURL_SEEKFUNC_FAIL;
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67 if(LSEEK_ERROR == lseek(in->fd, 0, SEEK_SET))
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68 /* couldn't rewind to beginning */
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69 return CURL_SEEKFUNC_FAIL;
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71 while(left) {
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72 long step = (left > OUR_MAX_SEEK_O) ? OUR_MAX_SEEK_L : (long)left;
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73 if(LSEEK_ERROR == lseek(in->fd, step, SEEK_CUR))
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74 /* couldn't seek forwards the desired amount */
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75 return CURL_SEEKFUNC_FAIL;
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76 left -= step;
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77 }
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78 return CURL_SEEKFUNC_OK;
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79 }
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80 #endif
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81
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82 if(LSEEK_ERROR == lseek(in->fd, offset, whence))
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83 /* couldn't rewind, the reason is in errno but errno is just not portable
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84 enough and we don't actually care that much why we failed. We'll let
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85 libcurl know that it may try other means if it wants to. */
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86 return CURL_SEEKFUNC_CANTSEEK;
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87
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88 return CURL_SEEKFUNC_OK;
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89 }
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90
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91 #if defined(WIN32) && !defined(__MINGW64__)
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93 #ifdef __BORLANDC__
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94 /* 64-bit lseek-like function unavailable */
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95 # define _lseeki64(hnd,ofs,whence) lseek(hnd,ofs,whence)
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96 #endif
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98 #ifdef __POCC__
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99 # if(__POCC__ < 450)
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100 /* 64-bit lseek-like function unavailable */
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101 # define _lseeki64(hnd,ofs,whence) _lseek(hnd,ofs,whence)
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102 # else
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103 # define _lseeki64(hnd,ofs,whence) _lseek64(hnd,ofs,whence)
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104 # endif
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105 #endif
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106
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107 #ifdef _WIN32_WCE
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108 /* 64-bit lseek-like function unavailable */
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109 # undef _lseeki64
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110 # define _lseeki64(hnd,ofs,whence) lseek(hnd,ofs,whence)
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111 # undef _get_osfhandle
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112 # define _get_osfhandle(fd) (fd)
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113 #endif
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114
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115 /*
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116 * Truncate a file handle at a 64-bit position 'where'.
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117 */
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118
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119 int tool_ftruncate64(int fd, curl_off_t where)
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120 {
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121 intptr_t handle = _get_osfhandle(fd);
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122
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123 if(_lseeki64(fd, where, SEEK_SET) < 0)
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124 return -1;
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125
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126 if(!SetEndOfFile((HANDLE)handle))
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127 return -1;
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128
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129 return 0;
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130 }
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131
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132 #endif /* WIN32 && ! __MINGW64__ */