81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
/* $NetBSD: offtab.h,v 1.3 2017/04/16 23:50:40 riastradh Exp $ */
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/*-
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* Copyright (c) 2014 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Taylor R. Campbell.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef VNDCOMPRESS_OFFTAB_H
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#define VNDCOMPRESS_OFFTAB_H
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#include <sys/cdefs.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include "common.h"
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struct offtab {
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uint32_t ot_n_offsets;
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uint32_t ot_window_size;
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uint32_t ot_window_start;
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uint64_t *ot_window;
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uint32_t ot_blkno;
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int ot_fd;
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off_t ot_fdpos;
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void (*ot_report)(const char *, ...) __printflike(1,2);
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void (*ot_reportx)(const char *, ...) __printflike(1,2);
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enum offtab_mode {
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OFFTAB_MODE_NONE,
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OFFTAB_MODE_READ,
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OFFTAB_MODE_WRITE,
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} ot_mode;
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};
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#define OFFTAB_MAX_FDPOS \
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((off_t)(MIN(OFF_MAX, UINT64_MAX) - \
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(off_t)MAX_N_OFFSETS*sizeof(uint64_t)))
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void offtab_init(struct offtab *, uint32_t, uint32_t, int, off_t);
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void offtab_destroy(struct offtab *);
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bool offtab_transmogrify_read_to_write(struct offtab *, uint32_t);
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bool offtab_reset_read(struct offtab *,
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void (*)(const char *, ...) __printflike(1,2),
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void (*)(const char *, ...) __printflike(1,2));
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bool offtab_prepare_get(struct offtab *, uint32_t);
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uint64_t offtab_get(struct offtab *, uint32_t);
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void offtab_reset_write(struct offtab *);
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void offtab_checkpoint(struct offtab *, uint32_t, int);
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#define OFFTAB_CHECKPOINT_SYNC 1
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void offtab_prepare_put(struct offtab *, uint32_t);
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void offtab_put(struct offtab *, uint32_t, uint64_t);
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#endif /* VNDCOMPRESS_OFFTAB_H */
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