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/* Copyright 1999-2003,2006,2008,2009 Alain Knaff.
* This file is part of mtools.
*
* Mtools is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Mtools is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Mtools. If not, see <http://www.gnu.org/licenses/>.
*/
#include "sysincludes.h"
#include "stream.h"
#include "fsP.h"
#include "llong.h"
#include "mtools.h"
#if 1
const mt_off_t max_off_t_31 = MAX_OFF_T_B(31); /* Floppyd */
const mt_off_t max_off_t_32 = MAX_OFF_T_B(32); /* Directory */
const mt_off_t max_off_t_41 = MAX_OFF_T_B(41); /* SCSI */
const mt_off_t max_off_t_seek = MAX_OFF_T_B(SEEK_BITS); /* SCSI */
#else
const mt_off_t max_off_t_31 = MAX_OFF_T_B(10); /* Floppyd */
const mt_off_t max_off_t_41 = MAX_OFF_T_B(10); /* SCSI */
const mt_off_t max_off_t_seek = MAX_OFF_T_B(10); /* SCSI */
#endif
int fileTooBig(mt_off_t off) {
return (off & ~max_off_t_32) != 0;
}
off_t truncBytes32(mt_off_t off)
{
if (fileTooBig(off)) {
fprintf(stderr, "Internal error, offset too big\n");
exit(1);
}
return (off_t) off;
}
mt_off_t sectorsToBytes(Stream_t *Stream, off_t off)
{
DeclareThis(Fs_t);
return (mt_off_t) off << This->sectorShift;
}
#if defined HAVE_LLSEEK
# ifndef HAVE_LLSEEK_PROTOTYPE
extern long long llseek (int fd, long long offset, int origin);
# endif
#endif
#if defined HAVE_LSEEK64
# ifndef HAVE_LSEEK64_PROTOTYPE
extern long long lseek64 (int fd, long long offset, int origin);
# endif
#endif
int mt_lseek(int fd, mt_off_t where, int whence)
{
#if defined HAVE_LSEEK64
if(lseek64(fd, where, whence) >= 0)
return 0;
else
return -1;
#elif defined HAVE_LLSEEK
if(llseek(fd, where, whence) >= 0)
return 0;
else
return -1;
#else
if (lseek(fd, (off_t) where, whence) >= 0)
return 0;
else
return 1;
#endif
}
unsigned int log_2(int size)
{
unsigned int i;
for(i=0; i<24; i++) {
if(1 << i == size)
return i;
}
return 24;
}
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