58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/* Copyright 1999-2003,2006,2008,2009 Alain Knaff.
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* Copyright 2010 Volker Lanz (vl@fidra.de)
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* This file is part of mtools.
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*
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* Mtools is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Mtools is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Mtools. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "stream.h"
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#include "fs.h"
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#include "llong.h"
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#include "mtools.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <unistd.h>
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const off_t max_off_t_32 = MAX_OFF_T_B(32); /* Directory */
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const off_t max_off_t_seek = MAX_OFF_T_B(SEEK_BITS); /* SCSI */
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static int fileTooBig(off_t off)
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{
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return (off & ~max_off_t_32) != 0;
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}
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off_t truncBytes32(off_t off)
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{
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if (fileTooBig(off))
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{
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fprintf(stderr, "Internal error, offset too big\n");
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return off; // TODO: this used to be an exit(1)...
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}
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return (off_t) off;
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}
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off_t sectorsToBytes(struct Stream_t *Stream, off_t off)
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{
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DeclareThis(struct Fs_t);
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return (off_t) off << This->sectorShift;
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}
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int mt_lseek(int fd, off_t where, int whence)
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{
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return lseek64(fd, where, whence) >= 0 ? 0 : -1;
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}
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