[352] | 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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| 23 |
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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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| 27 |
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| 28 | #include "tool_cfgable.h"
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| 29 | #include "tool_cb_see.h"
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| 30 |
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| 31 | #include "memdebug.h" /* keep this as LAST include */
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| 32 |
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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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| 36 |
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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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| 39 |
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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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| 46 |
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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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| 50 |
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| 51 | #if(CURL_SIZEOF_CURL_OFF_T > SIZEOF_OFF_T) && !defined(USE_WIN32_LARGE_FILES)
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| 52 |
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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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| 56 |
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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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| 66 |
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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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| 70 |
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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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| 92 |
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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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| 97 |
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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 | if(_lseeki64(fd, where, SEEK_SET) < 0)
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| 122 | return -1;
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| 123 |
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| 124 | if(!SetEndOfFile((HANDLE)_get_osfhandle(fd)))
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| 125 | return -1;
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| 126 |
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| 127 | return 0;
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| 128 | }
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| 129 |
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| 130 | #endif /* WIN32 && ! __MINGW64__ */
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| 131 |
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