Mercurial > hgrepos > Python2 > PyMuPDF

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

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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
parents
children
comparison
equal deleted inserted replaced
1:1d09e1dec1d9 2:b50eed0cc0ef
1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.haxx.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22 #include "tool_setup.h"
23
24 #define ENABLE_CURLX_PRINTF
25 /* use our own printf() functions */
26 #include "curlx.h"
27
28 #include "tool_cfgable.h"
29 #include "tool_cb_see.h"
30
31 #include "memdebug.h" /* keep this as LAST include */
32
33 /* OUR_MAX_SEEK_L has 'long' data type, OUR_MAX_SEEK_O has 'curl_off_t,
34 both represent the same value. Maximum offset used here when we lseek
35 using a 'long' data type offset */
36
37 #define OUR_MAX_SEEK_L 2147483647L - 1L
38 #define OUR_MAX_SEEK_O CURL_OFF_T_C(0x7FFFFFFF) - CURL_OFF_T_C(0x1)
39
40 /*
41 ** callback for CURLOPT_SEEKFUNCTION
42 **
43 ** Notice that this is not supposed to return the resulting offset. This
44 ** shall only return CURL_SEEKFUNC_* return codes.
45 */
46
47 int tool_seek_cb(void *userdata, curl_off_t offset, int whence)
48 {
49 struct InStruct *in = userdata;
50
51 #if(CURL_SIZEOF_CURL_OFF_T > SIZEOF_OFF_T) && !defined(USE_WIN32_LARGE_FILES)
52
53 /* The offset check following here is only interesting if curl_off_t is
54 larger than off_t and we are not using the WIN32 large file support
55 macros that provide the support to do 64bit seeks correctly */
56
57 if(offset > OUR_MAX_SEEK_O) {
58 /* Some precaution code to work around problems with different data sizes
59 to allow seeking >32bit even if off_t is 32bit. Should be very rare and
60 is really valid on weirdo-systems. */
61 curl_off_t left = offset;
62
63 if(whence != SEEK_SET)
64 /* this code path doesn't support other types */
65 return CURL_SEEKFUNC_FAIL;
66
67 if(LSEEK_ERROR == lseek(in->fd, 0, SEEK_SET))
68 /* couldn't rewind to beginning */
69 return CURL_SEEKFUNC_FAIL;
70
71 while(left) {
72 long step = (left > OUR_MAX_SEEK_O) ? OUR_MAX_SEEK_L : (long)left;
73 if(LSEEK_ERROR == lseek(in->fd, step, SEEK_CUR))
74 /* couldn't seek forwards the desired amount */
75 return CURL_SEEKFUNC_FAIL;
76 left -= step;
77 }
78 return CURL_SEEKFUNC_OK;
79 }
80 #endif
81
82 if(LSEEK_ERROR == lseek(in->fd, offset, whence))
83 /* couldn't rewind, the reason is in errno but errno is just not portable
84 enough and we don't actually care that much why we failed. We'll let
85 libcurl know that it may try other means if it wants to. */
86 return CURL_SEEKFUNC_CANTSEEK;
87
88 return CURL_SEEKFUNC_OK;
89 }
90
91 #if defined(WIN32) && !defined(__MINGW64__)
92
93 #ifdef __BORLANDC__
94 /* 64-bit lseek-like function unavailable */
95 # define _lseeki64(hnd,ofs,whence) lseek(hnd,ofs,whence)
96 #endif
97
98 #ifdef __POCC__
99 # if(__POCC__ < 450)
100 /* 64-bit lseek-like function unavailable */
101 # define _lseeki64(hnd,ofs,whence) _lseek(hnd,ofs,whence)
102 # else
103 # define _lseeki64(hnd,ofs,whence) _lseek64(hnd,ofs,whence)
104 # endif
105 #endif
106
107 #ifdef _WIN32_WCE
108 /* 64-bit lseek-like function unavailable */
109 # undef _lseeki64
110 # define _lseeki64(hnd,ofs,whence) lseek(hnd,ofs,whence)
111 # undef _get_osfhandle
112 # define _get_osfhandle(fd) (fd)
113 #endif
114
115 /*
116 * Truncate a file handle at a 64-bit position 'where'.
117 */
118
119 int tool_ftruncate64(int fd, curl_off_t where)
120 {
121 intptr_t handle = _get_osfhandle(fd);
122
123 if(_lseeki64(fd, where, SEEK_SET) < 0)
124 return -1;
125
126 if(!SetEndOfFile((HANDLE)handle))
127 return -1;
128
129 return 0;
130 }
131
132 #endif /* WIN32 && ! __MINGW64__ */