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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at 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 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) 1997, by Sun Microsystems, Inc.
* All rights reserved.
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include "tab_lookup.h" /* table lookup data types */
int bisearch(unsigned long val, _icv_state *st, int n);
/*
* Actual conversion; called from iconv().
* Peforms conversion as per the parameters specified in
* structure st.
*/
size_t
_icv_iconv_lu(_icv_state *st, unsigned char **ibuf, size_t *inbytesleft,
unsigned char **obuf, size_t *outbytesleft)
{
int idx, data_size;
unsigned long search_val = 0, match_val;
unsigned char **inbuf, **outbuf;
inbuf = (unsigned char **)ibuf;
outbuf = (unsigned char **)obuf;
if (st == NULL) {
errno = EBADF;
return ((size_t)-1);
}
if (inbuf == NULL || *inbuf == NULL) { /* Reset request */
return 0;
}
errno = 0;
while (*inbytesleft > 0 && *outbytesleft > 0) {
fprintf(stderr, "INBL: %d , OUBL: %d \n",
*inbytesleft, *outbytesleft);
search_val = 0;
/*
* form a search member
* lookup character by character
*/
if ( st->left_to_right ) {
/*
* create search val from the left code
*/
data_size = st->left_code_size;
while ( data_size > 0 ) {
search_val = ( search_val << 8 ) | ( **inbuf );
data_size--;
(*inbuf)++;
(*inbytesleft)--;
}
idx = bisearch(search_val, st, st->table_size);
#ifdef TEST
fprintf(stderr, "Match idx: %d \n", idx);
#endif
if ( idx >= 0 ) {
/*
* create matched code from the right column
*/
match_val = st->table[idx].right_code;
} else {
match_val = NON_ID_CHAR;
}
/*
* Check sufficient space in the outbuf
*/
if ( *outbytesleft >= st->right_code_size ) {
data_size = st->right_code_size;
while ( data_size > 0 ) {
*(*outbuf + data_size-- - 1 ) =
(unsigned char) (match_val & 0xff);
#ifdef TEST
fprintf(stderr, "outbyte: %x \n",
(unsigned char) (match_val & 0xff));
#endif
match_val >>= 8;
}
(*outbuf) += st->right_code_size;
(*outbytesleft) -= st->right_code_size;
} else {
/* no space for outbytes */
errno = E2BIG;
return ((size_t)-1);
}
} else {
/* search from right to left */
/*
* create search val from the left code
*/
data_size = st->right_code_size;
while ( data_size > 0 ) {
search_val = ( search_val << 8 ) | ( **inbuf );
data_size--;
(*inbuf)++;
(*inbytesleft)--;
}
idx = bisearch(search_val, st, st->table_size);
#ifdef TEST
fprintf(stderr, "Match idx: %d \n", idx);
#endif
if ( idx >= 0 ) {
/*
* create matched code from the right column
*/
match_val = st->table[idx].left_code;
} else {
match_val = UCS2_NON_ID_CHAR;
}
/*
* Check sufficient space in the outbuf
*/
if ( *outbytesleft >= st->left_code_size ) {
data_size = st->left_code_size;
while ( data_size > 0 ) {
*(*outbuf + data_size-- - 1 ) =
(unsigned char) (match_val & 0xff);
#ifdef TEST
fprintf(stderr, "outbyte: %x \n",
(unsigned char) (match_val & 0xff));
#endif
match_val >>= 8;
}
(*outbuf) += st->left_code_size;
(*outbytesleft) -= st->left_code_size;
} else {
/* no space for outbytes */
errno = E2BIG;
return ((size_t)-1);
}
}
#ifdef TEST
fprintf(stderr, "Search: %x match: %x \n", search_val, match_val);
#endif
}/* (*inbytesleft) && (*outbytesleft) */
if ( *inbytesleft && (!(*outbytesleft)) ) {
errno = E2BIG;
return ((size_t)-1);
}
return (*inbytesleft);
}
/*
* Performs the binary search in the lookup table of structure
* st. Memebers (left_to_right, right_to_left) control
* the lookup direction.
*/
int bisearch(unsigned long val, _icv_state *st, int n)
{
int low, high, mid;
#ifdef TEST
fprintf(stderr, "Search: %x limit: %d \n", val, n);
#endif
low = 0;
high = n - 1;
while ( low <= high ) {
mid = (low + high) / 2;
if ( st->left_to_right ) {
if ( val < st->table[mid].left_code )
high = mid - 1;
else if ( val > st->table[mid].left_code )
low = mid + 1;
else /* found match */
return mid;
} else {
if ( val < st->table[mid].right_code )
high = mid - 1;
else if ( val > st->table[mid].right_code )
low = mid + 1;
else /* found match */
return mid;
}
}
return (-1);
}
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