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f-stack/freebsd/libkern/iconv_xlat16.c

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/*-
* Copyright (c) 2003, 2005 Ryuichiro Imura
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/iconv.h>
#include "iconv_converter_if.h"
/*
* "XLAT16" converter
*/
#ifdef MODULE_DEPEND
MODULE_DEPEND(iconv_xlat16, libiconv, 2, 2, 2);
#endif
#define C2I1(c) ((c) & 0x8000 ? ((c) & 0xff) | 0x100 : (c) & 0xff)
#define C2I2(c) ((c) & 0x8000 ? ((c) >> 8) & 0x7f : ((c) >> 8) & 0xff)
/*
* XLAT16 converter instance
*/
struct iconv_xlat16 {
KOBJ_FIELDS;
uint32_t * d_table[0x200];
void * f_ctp;
void * t_ctp;
struct iconv_cspair * d_csp;
};
static int
iconv_xlat16_open(struct iconv_converter_class *dcp,
struct iconv_cspair *csp, struct iconv_cspair *cspf, void **dpp)
{
struct iconv_xlat16 *dp;
uint32_t *headp, **idxp;
int i;
dp = (struct iconv_xlat16 *)kobj_create((struct kobj_class*)dcp, M_ICONV, M_WAITOK);
headp = (uint32_t *)((caddr_t)csp->cp_data + sizeof(dp->d_table));
idxp = (uint32_t **)csp->cp_data;
for (i = 0 ; i < 0x200 ; i++) {
if (*idxp) {
dp->d_table[i] = headp;
headp += 0x80;
} else {
dp->d_table[i] = NULL;
}
idxp++;
}
if (strcmp(csp->cp_to, KICONV_WCTYPE_NAME) != 0) {
if (iconv_open(KICONV_WCTYPE_NAME, csp->cp_from, &dp->f_ctp) != 0)
dp->f_ctp = NULL;
if (iconv_open(KICONV_WCTYPE_NAME, csp->cp_to, &dp->t_ctp) != 0)
dp->t_ctp = NULL;
} else {
dp->f_ctp = dp->t_ctp = dp;
}
dp->d_csp = csp;
csp->cp_refcount++;
*dpp = (void*)dp;
return (0);
}
static int
iconv_xlat16_close(void *data)
{
struct iconv_xlat16 *dp = data;
if (dp->f_ctp && dp->f_ctp != data)
iconv_close(dp->f_ctp);
if (dp->t_ctp && dp->t_ctp != data)
iconv_close(dp->t_ctp);
dp->d_csp->cp_refcount--;
kobj_delete((struct kobj*)data, M_ICONV);
return (0);
}
static int
iconv_xlat16_conv(void *d2p, const char **inbuf,
size_t *inbytesleft, char **outbuf, size_t *outbytesleft,
int convchar, int casetype)
{
struct iconv_xlat16 *dp = (struct iconv_xlat16*)d2p;
const char *src;
char *dst;
int nullin, ret = 0;
size_t in, on, ir, or, inlen;
uint32_t code;
u_char u, l;
uint16_t c1, c2, ctmp;
if (inbuf == NULL || *inbuf == NULL || outbuf == NULL || *outbuf == NULL)
return (0);
ir = in = *inbytesleft;
or = on = *outbytesleft;
src = *inbuf;
dst = *outbuf;
while(ir > 0 && or > 0) {
inlen = 0;
code = 0;
c1 = ir > 1 ? *(src+1) & 0xff : 0;
c2 = *src & 0xff;
ctmp = 0;
c1 = c2 & 0x80 ? c1 | 0x100 : c1;
c2 = c2 & 0x80 ? c2 & 0x7f : c2;
if (ir > 1 && dp->d_table[c1] && dp->d_table[c1][c2]) {
/*
* inbuf char is a double byte char
*/
inlen = 2;
/* toupper,tolower */
if (casetype == KICONV_FROM_LOWER && dp->f_ctp)
ctmp = towlower(((u_char)*src << 8) | (u_char)*(src + 1),
dp->f_ctp);
else if (casetype == KICONV_FROM_UPPER && dp->f_ctp)
ctmp = towupper(((u_char)*src << 8) | (u_char)*(src + 1),
dp->f_ctp);
if (ctmp) {
c1 = C2I1(ctmp);
c2 = C2I2(ctmp);
}
}
if (inlen == 0) {
c1 &= 0xff00;
if (!dp->d_table[c1]) {
ret = -1;
break;
}
/*
* inbuf char is a single byte char
*/
inlen = 1;
if (casetype & (KICONV_FROM_LOWER|KICONV_FROM_UPPER))
code = dp->d_table[c1][c2];
if (casetype == KICONV_FROM_LOWER) {
if (dp->f_ctp)
ctmp = towlower((u_char)*src, dp->f_ctp);
else if (code & XLAT16_HAS_FROM_LOWER_CASE)
ctmp = (u_char)(code >> 16);
} else if (casetype == KICONV_FROM_UPPER) {
if (dp->f_ctp)
ctmp = towupper((u_char)*src, dp->f_ctp);
else if (code & XLAT16_HAS_FROM_UPPER_CASE)
ctmp = (u_char)(code >> 16);
}
if (ctmp) {
c1 = C2I1(ctmp << 8);
c2 = C2I2(ctmp << 8);
}
}
code = dp->d_table[c1][c2];
if (!code) {
ret = -1;
break;
}
nullin = (code & XLAT16_ACCEPT_NULL_IN) ? 1 : 0;
if (inlen == 1 && nullin) {
/*
* XLAT16_ACCEPT_NULL_IN requires inbuf has 2byte
*/
ret = -1;
break;
}
/*
* now start translation
*/
u = (u_char)(code >> 8);
l = (u_char)code;
#ifdef XLAT16_ACCEPT_3BYTE_CHR
if (code & XLAT16_IS_3BYTE_CHR) {
if (or < 3) {
ret = -1;
break;
}
*dst++ = u;
*dst++ = l;
*dst++ = (u_char)(code >> 16);
or -= 3;
} else
#endif
if (u || code & XLAT16_ACCEPT_NULL_OUT) {
if (or < 2) {
ret = -1;
break;
}
/* toupper,tolower */
if (casetype == KICONV_LOWER && dp->t_ctp) {
code = towlower((uint16_t)code, dp->t_ctp);
u = (u_char)(code >> 8);
l = (u_char)code;
}
if (casetype == KICONV_UPPER && dp->t_ctp) {
code = towupper((uint16_t)code, dp->t_ctp);
u = (u_char)(code >> 8);
l = (u_char)code;
}
*dst++ = u;
*dst++ = l;
or -= 2;
} else {
/* toupper,tolower */
if (casetype == KICONV_LOWER) {
if (dp->t_ctp)
l = (u_char)towlower(l, dp->t_ctp);
else if (code & XLAT16_HAS_LOWER_CASE)
l = (u_char)(code >> 16);
}
if (casetype == KICONV_UPPER) {
if (dp->t_ctp)
l = (u_char)towupper(l, dp->t_ctp);
else if (code & XLAT16_HAS_UPPER_CASE)
l = (u_char)(code >> 16);
}
*dst++ = l;
or--;
}
if (inlen == 2) {
/*
* there is a case that inbuf char is a single
* byte char while inlen == 2
*/
if ((u_char)*(src+1) == 0 && !nullin ) {
src++;
ir--;
} else {
src += 2;
ir -= 2;
}
} else {
src++;
ir--;
}
if (convchar == 1)
break;
}
*inbuf += in - ir;
*outbuf += on - or;
*inbytesleft -= in - ir;
*outbytesleft -= on - or;
return (ret);
}
static const char *
iconv_xlat16_name(struct iconv_converter_class *dcp)
{
return ("xlat16");
}
static int
iconv_xlat16_tolower(void *d2p, register int c)
{
struct iconv_xlat16 *dp = (struct iconv_xlat16*)d2p;
register int c1, c2, out;
if (c < 0x100) {
c1 = C2I1(c << 8);
c2 = C2I2(c << 8);
} else if (c < 0x10000) {
c1 = C2I1(c);
c2 = C2I2(c);
} else
return (c);
if (dp->d_table[c1] && dp->d_table[c1][c2] & XLAT16_HAS_LOWER_CASE) {
/*return (int)(dp->d_table[c1][c2] & 0xffff);*/
out = dp->d_table[c1][c2] & 0xffff;
if ((out & 0xff) == 0)
out = (out >> 8) & 0xff;
return (out);
} else
return (c);
}
static int
iconv_xlat16_toupper(void *d2p, register int c)
{
struct iconv_xlat16 *dp = (struct iconv_xlat16*)d2p;
register int c1, c2, out;
if (c < 0x100) {
c1 = C2I1(c << 8);
c2 = C2I2(c << 8);
} else if (c < 0x10000) {
c1 = C2I1(c);
c2 = C2I2(c);
} else
return (c);
if (dp->d_table[c1] && dp->d_table[c1][c2] & XLAT16_HAS_UPPER_CASE) {
out = dp->d_table[c1][c2] & 0xffff;
if ((out & 0xff) == 0)
out = (out >> 8) & 0xff;
return (out);
} else
return (c);
}
static kobj_method_t iconv_xlat16_methods[] = {
KOBJMETHOD(iconv_converter_open, iconv_xlat16_open),
KOBJMETHOD(iconv_converter_close, iconv_xlat16_close),
KOBJMETHOD(iconv_converter_conv, iconv_xlat16_conv),
#if 0
KOBJMETHOD(iconv_converter_init, iconv_xlat16_init),
KOBJMETHOD(iconv_converter_done, iconv_xlat16_done),
#endif
KOBJMETHOD(iconv_converter_name, iconv_xlat16_name),
KOBJMETHOD(iconv_converter_tolower, iconv_xlat16_tolower),
KOBJMETHOD(iconv_converter_toupper, iconv_xlat16_toupper),
{0, 0}
};
KICONV_CONVERTER(xlat16, sizeof(struct iconv_xlat16));
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