130 lines
3.5 KiB
C
130 lines
3.5 KiB
C
/*
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Copyright (c) 1990-2009 Info-ZIP. All rights reserved.
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See the accompanying file LICENSE, version 2009-Jan-02 or later
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(the contents of which are also included in zip.h) for terms of use.
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If, for some reason, all these files are missing, the Info-ZIP license
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also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html
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*/
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/*---------------------------------------------------------------------------
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win32/win32i64.c - UnZip 6
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64-bit filesize support for WIN32 Zip and UnZip.
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---------------------------------------------------------------------------*/
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#include "../zip.h"
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/* --------------------------------------------------- */
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/* Large File Support
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*
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* Initial functions by E. Gordon and R. Nausedat
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* 9/10/2003
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*
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* These implement 64-bit file support for Windows. The
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* defines and headers are in win32/osdep.h.
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*
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* These moved from win32.c by Mike White to avoid conflicts
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* in WiZ of same name functions in UnZip and Zip libraries.
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* 9/25/04 EG
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*/
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#if defined(LARGE_FILE_SUPPORT) && !defined(__CYGWIN__)
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# ifdef USE_STRM_INPUT
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# ifndef zftello
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/* 64-bit buffered ftello
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*
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* Win32 does not provide a 64-bit buffered
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* ftell (in the published api anyway) so below provides
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* hopefully close version.
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* We have not gotten _telli64 to work with buffered
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* streams. Below cheats by using fgetpos improperly and
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* may not work on other ports.
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*/
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zoff_t zftello(stream)
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FILE *stream;
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{
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fpos_t fpos = 0;
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if (fgetpos(stream, &fpos) != 0) {
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return -1L;
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} else {
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return fpos;
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}
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}
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# endif /* ndef zftello */
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# ifndef zfseeko
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/* 64-bit buffered fseeko
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*
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* Win32 does not provide a 64-bit buffered
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* fseeko, so use _lseeki64 and fflush. Note
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* that SEEK_CUR can lose track of location
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* if fflush is done between the last buffered
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* io and this call.
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*/
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int zfseeko(stream, offset, origin)
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FILE *stream;
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zoff_t offset;
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int origin;
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{
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/* fseek() or its replacements are supposed to clear the eof status
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of the stream. fflush() and _lseeki64() do not touch the stream's
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eof flag, so we have to do it manually. */
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#if ((defined(_MSC_VER) && (_MSC_VER >= 1200)) || \
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(defined(__MINGW32__) && defined(__MSVCRT_VERSION__)))
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/* For the MSC environment (VS 6 or higher), and for recent releases of
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the MinGW environment, we "know" the internals of the FILE structure.
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So, we can clear just the EOF bit of the status flag. */
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stream->_flag &= ~_IOEOF;
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#else
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/* Unfortunately, there is no standard "cleareof()" function, so we have
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to use clearerr(). This has the unwanted side effect of clearing the
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ferror() state as well. */
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clearerr(stream);
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#endif
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if (origin == SEEK_CUR) {
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/* instead of synching up lseek easier just to figure and
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use an absolute offset */
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offset += zftello(stream);
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origin = SEEK_SET;
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}
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fflush(stream);
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if (_lseeki64(fileno(stream), offset, origin) == (zoff_t)-1L) {
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return -1;
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} else {
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return 0;
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}
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}
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# endif /* ndef fseeko */
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# endif /* USE_STRM_INPUT */
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#endif /* Win32 LARGE_FILE_SUPPORT */
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#if 0
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FILE* zfopen(filename, mode)
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const char *filename;
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const char *mode;
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{
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FILE* fTemp;
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fTemp = fopen(filename, mode);
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if( fTemp == NULL )
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return NULL;
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/* sorry, could not make VC60 and its rtl work properly without setting the
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* file buffer to NULL. the problem seems to be _telli64 which seems to
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* return the max stream position, comments are welcome
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*/
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setbuf(fTemp, NULL);
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return fTemp;
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}
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#endif
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/* --------------------------------------------------- */
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