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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1994, by Sun Microsytems, Inc.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "libtnf.h"
/*
* File header operations
*/
tnf_datum_t
tnf_get_file_header(TNF *tnf)
{
return (DATUM(tnf->file_header_info, (caddr_t)tnf->file_header));
}
/*
* Block access operations
*/
unsigned
tnf_get_block_count(TNF *tnf)
{
return (tnf->block_count);
}
tnf_datum_t
tnf_get_block_absolute(TNF *tnf, unsigned index)
{
if (index >= tnf->block_count)
/*
* access to non-existent block:
* no error as per spec
*/
return (TNF_DATUM_NULL);
else
/*
* XXX Require a single block header tag
*/
/* LINTED pointer cast may result in improper alignment */
return (DATUM(tnf->block_header_info,
(caddr_t)_GET_INDEX_BLOCK(tnf, index)));
}
tnf_datum_t
tnf_get_block_relative(tnf_datum_t datum, int adjust)
{
TNF *tnf;
tnf_ref32_t *bhdr;
unsigned index;
CHECK_DATUM(datum);
tnf = DATUM_TNF(datum);
bhdr = _GET_BLOCK(tnf, DATUM_VAL(datum));
index = _GET_BLOCK_INDEX(tnf, bhdr);
return (tnf_get_block_absolute(tnf, index + adjust));
}
int
tnf_is_block_header(tnf_datum_t datum)
{
struct taginfo *info;
caddr_t val;
tnf_ref32_t *bhdr;
CHECK_DATUM(datum);
info = DATUM_INFO(datum);
val = DATUM_VAL(datum);
bhdr = _GET_BLOCK(info->tnf, val);
return (((caddr_t)bhdr == val) &&
(info == info->tnf->block_header_info));
}
tnf_datum_t
tnf_get_block_header(tnf_datum_t datum)
{
TNF *tnf;
caddr_t val;
CHECK_DATUM(datum);
tnf = DATUM_TNF(datum);
val = DATUM_VAL(datum);
/*
* XXX Require a single block header tag
*/
return (DATUM(tnf->block_header_info, (caddr_t)_GET_BLOCK(tnf, val)));
}
/*
* Sequential record access
*/
tnf_datum_t
tnf_get_next_record(tnf_datum_t datum)
{
TNF *tnf;
tnf_ref32_t *bhdr, *cell, ref32;
caddr_t val, nval, bval, blim;
size_t size, bytes;
CHECK_RECORD(datum);
tnf = DATUM_TNF(datum);
val = DATUM_VAL(datum);
size = tnf_get_size(datum);
nval = val + size;
/* Check file bounds */
if (nval < tnf->data_start)
return (tnf_get_block_absolute(tnf, 0));
else if (nval >= tnf->file_end)
return (TNF_DATUM_NULL);
/*
* OK, nval is in data area, start looking in block
*/
bhdr = _GET_BLOCK(tnf, nval);
/* LINTED pointer cast may result in improper alignment */
bytes = _GET_BLOCK_BYTES_VALID(tnf, bhdr);
bval = (caddr_t)bhdr;
blim = bval + bytes;
/* sequentially examine valid cells in block from nval onwards */
while (nval < blim) {
/* LINTED pointer cast may result in improper alignment */
cell = (tnf_ref32_t *)nval;
ref32 = _GET_INT32(tnf, cell);
switch (TNF_REF32_TYPE(ref32)) {
case TNF_REF32_T_FWD: /* skip forwarding cells */
nval += sizeof (tnf_ref32_t);
break;
case TNF_REF32_T_RSVD: /* catch bogus cells */
_tnf_error(tnf, TNF_ERR_BADTNF);
return (TNF_DATUM_NULL);
default: /* PAIR or TAG: record header */
return (RECORD_DATUM(tnf, cell));
}
}
/*
* Couldn't find it: return next non-zero block header
*/
while ((bval += tnf->block_size) < tnf->file_end)
/* Gotta check that there is a real bhdr here */
/* LINTED pointer cast may result in improper alignment */
if (*(tnf_ref32_t *)bval != TNF_NULL)
/* LINTED pointer cast may result in improper alignment */
return (RECORD_DATUM(tnf, (tnf_ref32_t *)bval));
/*
* default: we're off the end of the file
*/
return (TNF_DATUM_NULL);
}
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