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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