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74 lines
2.9 KiB
C
74 lines
2.9 KiB
C
/*
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* Copyright (C) 2018 John Forecast. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN FORECAST "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __TAPE_H__
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#define __TAPE_H__
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/*
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* Metadata markers
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*/
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#define ST_EOM 0xFFFFFFFF /* end of medium */
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#define ST_GAP 0xFFFFFFFE /* erase gap */
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#define ST_TM 0x00000000 /* tape mark */
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/*
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* Special code for reporting errors. If actually read from a container
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* file, this would be considered an error.
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*/
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#define ST_FAIL 0xFEFEFEFE
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/*
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* Record length field layout
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*/
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#define ST_ERROR 0x80000000 /* record contains an error */
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#define ST_MBZ 0x7F000000 /* must be zero */
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#define ST_LENGTH 0x00FFFFFF /* record length */
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/*
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* Data in the .tap container file is rounded up to an even number of bytes
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*/
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#define RECLEN(c) (((c) + 1) & ~1)
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extern int tapeVerify(FILE *, off_t *);
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extern off_t tapeGetPosition(FILE *);
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extern int tapeSetPosition(FILE *, off_t);
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extern uint32_t tapeSkipRecordF(FILE *);
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extern uint32_t tapeSkipRecordR(FILE *);
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extern uint32_t tapePeekRecordLength(FILE *);
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extern uint32_t tapeReadRecord(FILE *, void *, int);
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extern uint32_t tapeReadRecordLength(FILE *);
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extern uint32_t tapeReadRecordLengthReverse(FILE *);
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extern int tapeWriteRecord(FILE *, void *, int);
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extern int tapeWriteEOM(FILE *, int);
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extern int tapeWriteTM(FILE *);
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extern int tapeEOM(FILE *, off_t *);
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extern void tapeRewind(FILE *);
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extern int tapeSkipForward(FILE *, unsigned long);
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extern int tapeSkipReverse(FILE *, unsigned long);
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#endif
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