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citrus_mapper_std.c revision 1.2 
      1 /*	$NetBSD: citrus_mapper_std.c,v 1.2 2003/06/27 17:53:31 tshiozak Exp $	*/
      2 
      3 /*-
      4  * Copyright (c)2003 Citrus Project,
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 #if defined(LIBC_SCCS) && !defined(lint)
     31 __RCSID("$NetBSD: citrus_mapper_std.c,v 1.2 2003/06/27 17:53:31 tshiozak Exp $");
     32 #endif /* LIBC_SCCS and not lint */
     33 
     34 #include <assert.h>
     35 #include <errno.h>
     36 #include <limits.h>
     37 #include <stdio.h>
     38 #include <stdlib.h>
     39 #include <stdint.h>
     40 #include <string.h>
     41 #include <sys/endian.h>
     42 #include <sys/queue.h>
     43 
     44 #include "citrus_namespace.h"
     45 #include "citrus_types.h"
     46 #include "citrus_bcs.h"
     47 #include "citrus_region.h"
     48 #include "citrus_mmap.h"
     49 #include "citrus_module.h"
     50 #include "citrus_hash.h"
     51 #include "citrus_mapper.h"
     52 #include "citrus_db.h"
     53 #include "citrus_db_hash.h"
     54 
     55 #include "citrus_mapper_std.h"
     56 #include "citrus_mapper_std_file.h"
     57 
     58 /* ---------------------------------------------------------------------- */
     59 
     60 _CITRUS_MAPPER_DECLS(mapper_std);
     61 _CITRUS_MAPPER_DEF_OPS(mapper_std);
     62 
     63 
     64 /* ---------------------------------------------------------------------- */
     65 
     66 int
     67 _citrus_mapper_std_mapper_getops(struct _citrus_mapper_ops *ops, size_t lenops,
     68 				 u_int32_t expected_version)
     69 {
     70 	if (expected_version<_CITRUS_MAPPER_ABI_VERSION || lenops<sizeof(*ops))
     71 		return (EINVAL);
     72 
     73 	memcpy(ops, &_citrus_mapper_std_mapper_ops,
     74 	       sizeof(_citrus_mapper_std_mapper_ops));
     75 
     76 	return (0);
     77 }
     78 
     79 /* ---------------------------------------------------------------------- */
     80 
     81 static int
     82 /*ARGSUSED*/
     83 rowcol_convert(struct _citrus_mapper_std * __restrict ms,
     84 	       _index_t * __restrict dst, _index_t src,
     85 	       void * __restrict ps)
     86 {
     87 	struct _citrus_mapper_std_rowcol *rc = &ms->ms_rowcol;
     88 	_index_t row, col, idx;
     89 	u_int32_t conv;
     90 
     91 	if (rc->rc_src_col_bits == 32) {
     92 		row = 0;
     93 		col = src;
     94 	} else {
     95 		row = src >> rc->rc_src_col_bits;
     96 		col = src & ((1U<<rc->rc_src_col_bits)-1);
     97 	}
     98 	if (row < rc->rc_src_row_begin || row > rc->rc_src_row_end ||
     99 	    col < rc->rc_src_col_begin || col > rc->rc_src_col_end) {
    100 		*dst = rc->rc_dst_invalid;
    101 		return _MAPPER_CONVERT_INVAL;
    102 	}
    103 
    104 	idx  =
    105 	    (row - rc->rc_src_row_begin)*rc->rc_src_col_width +
    106 	    (col - rc->rc_src_col_begin);
    107 
    108 	switch (rc->rc_dst_unit_bits) {
    109 	case 8:
    110 		conv = _region_peek8(&rc->rc_table, idx);
    111 		break;
    112 	case 16:
    113 		conv = be16toh(_region_peek16(&rc->rc_table, idx*2));
    114 		break;
    115 	case 32:
    116 		conv = be32toh(_region_peek32(&rc->rc_table, idx*4));
    117 		break;
    118 	}
    119 
    120 	if (conv == rc->rc_dst_invalid) {
    121 		*dst = rc->rc_dst_invalid;
    122 		return _MAPPER_CONVERT_INVAL;
    123 	}
    124 
    125 	*dst = conv;
    126 
    127 	return _MAPPER_CONVERT_SUCCESS;
    128 }
    129 
    130 
    131 static int
    132 rowcol_init(struct _citrus_mapper_std *ms)
    133 {
    134 	int ret;
    135 	struct _citrus_mapper_std_rowcol *rc = &ms->ms_rowcol;
    136 	const struct _citrus_mapper_std_rowcol_info_x *rcx;
    137 	struct _region r;
    138 	u_int64_t table_size;
    139 
    140 	ms->ms_convert = &rowcol_convert;
    141 	ms->ms_uninit = NULL;
    142 
    143 	/* get table region */
    144 	ret = _db_lookup_by_s(ms->ms_db, _CITRUS_MAPPER_STD_SYM_TABLE,
    145 			      &rc->rc_table, NULL);
    146 	if (ret) {
    147 		if (ret==ENOENT)
    148 			ret = EFTYPE;
    149 		return ret;
    150 	}
    151 
    152 	/* get table information */
    153 	ret = _db_lookup_by_s(ms->ms_db, _CITRUS_MAPPER_STD_SYM_INFO, &r, NULL);
    154 	if (ret) {
    155 		if (ret==ENOENT)
    156 			ret =EFTYPE;
    157 		return ret;
    158 	}
    159 	if (_region_size(&r) < sizeof(*rcx))
    160 		return EFTYPE;
    161 	rcx = _region_head(&r);
    162 
    163 	/* convert */
    164 #define CONV_ROWCOL(rc, rcx, elem)			\
    165 do {							\
    166 	(rc)->rc_##elem = be32toh((rcx)->rcx_##elem);	\
    167 } while (/*CONSTCOND*/0)
    168 	CONV_ROWCOL(rc, rcx, src_col_bits);
    169 	CONV_ROWCOL(rc, rcx, dst_invalid);
    170 	CONV_ROWCOL(rc, rcx, src_row_begin);
    171 	CONV_ROWCOL(rc, rcx, src_row_end);
    172 	CONV_ROWCOL(rc, rcx, src_col_begin);
    173 	CONV_ROWCOL(rc, rcx, src_col_end);
    174 	CONV_ROWCOL(rc, rcx, dst_unit_bits);
    175 
    176 	rc->rc_src_col_width = rc->rc_src_col_end - rc->rc_src_col_begin +1;
    177 
    178 	/* validation checks */
    179 	if (rc->rc_src_col_end < rc->rc_src_col_begin ||
    180 	    rc->rc_src_row_end < rc->rc_src_row_begin ||
    181 	    !(rc->rc_dst_unit_bits==8 || rc->rc_dst_unit_bits==16 ||
    182 	      rc->rc_dst_unit_bits==32) ||
    183 	    !(rc->rc_src_col_bits >= 0 && rc->rc_src_col_bits <= 32))
    184 		return EFTYPE;
    185 
    186 	/* calcurate expected table size */
    187 	table_size  = rc->rc_src_row_end - rc->rc_src_row_begin + 1;
    188 	table_size *= rc->rc_src_col_width;
    189 	table_size *= rc->rc_dst_unit_bits/8;
    190 
    191 	if (table_size > UINT32_MAX ||
    192 	    _region_size(&rc->rc_table) < table_size)
    193 		return EFTYPE;
    194 
    195 	return 0;
    196 }
    197 
    198 typedef int (*initfunc_t)(struct _citrus_mapper_std *);
    199 static struct {
    200 	const char			*t_name;
    201 	initfunc_t			t_init;
    202 } types[] = {
    203 	{ _CITRUS_MAPPER_STD_TYPE_ROWCOL, &rowcol_init },
    204 };
    205 #define NUM_OF_TYPES ((int)(sizeof(types)/sizeof(types[0])))
    206 
    207 static int
    208 /*ARGSUSED*/
    209 _citrus_mapper_std_mapper_init(struct _citrus_mapper_area *__restrict ma,
    210 			       struct _citrus_mapper * __restrict cm,
    211 			       const char * __restrict curdir,
    212 			       const void * __restrict var, size_t lenvar,
    213 			       struct _citrus_mapper_traits * __restrict mt,
    214 			       size_t lenmt)
    215 {
    216 	char path[PATH_MAX];
    217 	const char *type;
    218 	int ret, id;
    219 	struct _citrus_mapper_std *ms;
    220 
    221 	/* set traits */
    222 	if (lenmt<sizeof(*mt)) {
    223 		ret = EINVAL;
    224 		goto err0;
    225 	}
    226 	mt->mt_src_max = mt->mt_dst_max = 1;	/* 1:1 converter */
    227 	mt->mt_state_size = 0;			/* stateless */
    228 
    229 	/* alloc mapper std structure */
    230 	ms = malloc(sizeof(*ms));
    231 	if (ms==NULL) {
    232 		ret = errno;
    233 		goto err0;
    234 	}
    235 
    236 	/* open mapper file */
    237 	snprintf(path, sizeof(path),
    238 		 "%s/%.*s", curdir, (int)lenvar, (const char *)var);
    239 	ret = _map_file(&ms->ms_file, path);
    240 	if (ret)
    241 		goto err1;
    242 
    243 	ret = _db_open(&ms->ms_db, &ms->ms_file, _CITRUS_MAPPER_STD_MAGIC,
    244 		       &_db_hash_std, NULL);
    245 	if (ret)
    246 		goto err2;
    247 
    248 	/* get mapper type */
    249 	ret = _db_lookupstr_by_s(ms->ms_db, _CITRUS_MAPPER_STD_SYM_TYPE,
    250 				 &type, NULL);
    251 	if (ret) {
    252 		if (ret==ENOENT)
    253 			ret = EFTYPE;
    254 		goto err3;
    255 	}
    256 	for (id=0; id<NUM_OF_TYPES; id++)
    257 		if (_bcs_strcasecmp(type, types[id].t_name) == 0)
    258 			break;
    259 
    260 	if (id == NUM_OF_TYPES)
    261 		goto err3;
    262 
    263 	/* init the per-type structure */
    264 	ret = (*types[id].t_init)(ms);
    265 	if (ret)
    266 		goto err3;
    267 
    268 	cm->cm_closure = ms;
    269 
    270 	return 0;
    271 
    272 err3:
    273 	_db_close(ms->ms_db);
    274 err2:
    275 	_unmap_file(&ms->ms_file);
    276 err1:
    277 	free(ms);
    278 err0:
    279 	return ret;
    280 }
    281 
    282 static void
    283 /*ARGSUSED*/
    284 _citrus_mapper_std_mapper_uninit(struct _citrus_mapper *cm)
    285 {
    286 	struct _citrus_mapper_std *ms;
    287 
    288 	_DIAGASSERT(cm!=NULL & cm->cm_closure!=NULL);
    289 
    290 	ms = cm->cm_closure;
    291 	if (ms->ms_uninit)
    292 		(*ms->ms_uninit)(ms);
    293 	_db_close(ms->ms_db);
    294 	_unmap_file(&ms->ms_file);
    295 	free(ms);
    296 }
    297 
    298 static void
    299 /*ARGSUSED*/
    300 _citrus_mapper_std_mapper_init_state(struct _citrus_mapper * __restrict cm,
    301 				     void * __restrict ps)
    302 {
    303 }
    304 
    305 static int
    306 /*ARGSUSED*/
    307 _citrus_mapper_std_mapper_convert(struct _citrus_mapper * __restrict cm,
    308 				  _index_t * __restrict dst, _index_t src,
    309 				  void * __restrict ps)
    310 {
    311 	struct _citrus_mapper_std *ms;
    312 
    313 	_DIAGASSERT(cm!=NULL && cm->cm_closure!=NULL);
    314 
    315 	ms = cm->cm_closure;
    316 
    317 	_DIAGASSERT(ms->ms_convert != NULL);
    318 
    319 	return (*ms->ms_convert)(ms, dst, src, ps);
    320 }
    321