Attachment 4605 Details for Bug 6660 – samba4alpha7 (modified iconv.c)

samba4alpha7 (modified iconv.c)

iconv.c (text/plain), 18.17 KB, created by inra on 2009-08-28 11:49:40 UTC

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Creator: inra

Created: 2009-08-28 11:49:40 UTC

Size: 18.17 KB

patch

obsolete

>/* 
>   Unix SMB/CIFS implementation.
>   minimal iconv implementation
>   Copyright (C) Andrew Tridgell 2001
>   Copyright (C) Jelmer Vernooij 2002
>   
>   This program is free software; you can redistribute it and/or modify
>   it under the terms of the GNU General Public License as published by
>   the Free Software Foundation; either version 3 of the License, or
>   (at your option) any later version.
>   
>   This program is distributed in the hope that it will be useful,
>   but WITHOUT ANY WARRANTY; without even the implied warranty of
>   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>   GNU General Public License for more details.
>   
>   You should have received a copy of the GNU General Public License
>   along with this program.  If not, see <http://www.gnu.org/licenses/>.
>*/
>
>#include "includes.h"
>#include "../lib/util/dlinklist.h"
>#include "system/iconv.h"
>#include "system/filesys.h"
>
>
>/**
> * @file
> *
> * @brief Samba wrapper/stub for iconv character set conversion.
> *
> * iconv is the XPG2 interface for converting between character
> * encodings.  This file provides a Samba wrapper around it, and also
> * a simple reimplementation that is used if the system does not
> * implement iconv.
> *
> * Samba only works with encodings that are supersets of ASCII: ascii
> * characters like whitespace can be tested for directly, multibyte
> * sequences start with a byte with the high bit set, and strings are
> * terminated by a nul byte.
> *
> * Note that the only function provided by iconv is conversion between
> * characters.  It doesn't directly support operations like
> * uppercasing or comparison.  We have to convert to UTF-16LE and
> * compare there.
> *
> * @sa Samba Developers Guide
> **/
>
>static size_t ascii_pull  (void *,const char **, size_t *, char **, size_t *);
>static size_t ascii_push  (void *,const char **, size_t *, char **, size_t *);
>static size_t utf8_pull   (void *,const char **, size_t *, char **, size_t *);
>static size_t utf8_push   (void *,const char **, size_t *, char **, size_t *);
>static size_t utf16_munged_pull(void *,const char **, size_t *, char **, size_t *);
>static size_t ucs2hex_pull(void *,const char **, size_t *, char **, size_t *);
>static size_t ucs2hex_push(void *,const char **, size_t *, char **, size_t *);
>static size_t iconv_copy  (void *,const char **, size_t *, char **, size_t *);
>static size_t iconv_swab  (void *,const char **, size_t *, char **, size_t *);
>
>static const struct charset_functions builtin_functions[] = {
>	/* windows is closest to UTF-16 */
>	{"UCS-2LE",  iconv_copy, iconv_copy},
>	{"UTF-16LE",  iconv_copy, iconv_copy},
>	{"UCS-2BE",  iconv_swab, iconv_swab},
>	{"UTF-16BE",  iconv_swab, iconv_swab},
>
>	/* we include the UTF-8 alias to cope with differing locale settings */
>	{"UTF8",   utf8_pull,  utf8_push},
>	{"UTF-8",   utf8_pull,  utf8_push},
>
>	/* this handles the munging needed for String2Key */
>	{"UTF16_MUNGED",   utf16_munged_pull,  iconv_copy},
>
>	{"ASCII", ascii_pull, ascii_push},
>	{"UCS2-HEX", ucs2hex_pull, ucs2hex_push}
>};
>
>static struct charset_functions *charsets = NULL;
>
>bool charset_register_backend(const void *_funcs) 
>{
>	struct charset_functions *funcs = (struct charset_functions *)memdup(_funcs,sizeof(struct charset_functions));
>	struct charset_functions *c;
>
>	/* Check whether we already have this charset... */
>	for (c = charsets; c != NULL; c = c->next) {
>		if(!strcasecmp(c->name, funcs->name)) { 
>			DEBUG(2, ("Duplicate charset %s, not registering\n", funcs->name));
>			return false;
>		}
>	}
>
>	funcs->next = funcs->prev = NULL;
>	DLIST_ADD(charsets, funcs);
>	return true;
>}
>
>#ifdef HAVE_NATIVE_ICONV
>/* if there was an error then reset the internal state,
>   this ensures that we don't have a shift state remaining for
>   character sets like SJIS */
>static size_t sys_iconv(void *cd, 
>			const char **inbuf, size_t *inbytesleft,
>			char **outbuf, size_t *outbytesleft)
>{
>	size_t ret = iconv((iconv_t)cd, 
>			   discard_const_p(char *, inbuf), inbytesleft, 
>			   outbuf, outbytesleft);
>	if (ret == (size_t)-1) iconv(cd, NULL, NULL, NULL, NULL);
>	return ret;
>}
>#endif
>
>/**
> * This is a simple portable iconv() implementaion.
> *
> * It only knows about a very small number of character sets - just
> * enough that Samba works on systems that don't have iconv.
> **/
>_PUBLIC_ size_t smb_iconv(smb_iconv_t cd, 
>		 const char **inbuf, size_t *inbytesleft,
>		 char **outbuf, size_t *outbytesleft)
>{
>	char cvtbuf[2048];
>	size_t bufsize;
>
>	/* in many cases we can go direct */
>	if (cd->direct) {
>		return cd->direct(cd->cd_direct, 
>				  inbuf, inbytesleft, outbuf, outbytesleft);
>	}
>
>
>	/* otherwise we have to do it chunks at a time */
>	while (*inbytesleft > 0) {
>		char *bufp1 = cvtbuf;
>		const char *bufp2 = cvtbuf;
>
>		bufsize = sizeof(cvtbuf);
>		
>		if (cd->pull(cd->cd_pull, 
>			     inbuf, inbytesleft, &bufp1, &bufsize) == -1
>		    && errno != E2BIG) return -1;
>
>		bufsize = sizeof(cvtbuf) - bufsize;
>
>		if (cd->push(cd->cd_push, 
>			     &bufp2, &bufsize, 
>			     outbuf, outbytesleft) == -1) return -1;
>	}
>
>	return 0;
>}
>
>static bool is_utf16(const char *name)
>{
>	return strcasecmp(name, "UCS-2LE") == 0 ||
>		strcasecmp(name, "UTF-16LE") == 0;
>}
>
>int smb_iconv_t_destructor(smb_iconv_t hwd)
>{ 
>#ifdef HAVE_NATIVE_ICONV
>    if (hwd->cd_pull != NULL && hwd->cd_pull != (iconv_t)-1)
>        iconv_close(hwd->cd_pull);
>    if (hwd->cd_push != NULL && hwd->cd_push != (iconv_t)-1)
>        iconv_close(hwd->cd_push);
>    if (hwd->cd_direct != NULL && hwd->cd_direct != (iconv_t)-1)
>        iconv_close(hwd->cd_direct);
>#endif
>    
>	return 0;     
>}
>
>_PUBLIC_ smb_iconv_t smb_iconv_open_ex(TALLOC_CTX *mem_ctx, const char *tocode, 
>			      const char *fromcode, bool native_iconv)
>{
>	smb_iconv_t ret;
>	const struct charset_functions *from=NULL, *to=NULL;
>	int i;
>
>	ret = (smb_iconv_t)talloc_named(mem_ctx,
>					sizeof(*ret), 
>					"iconv(%s,%s)", tocode, fromcode);
>	if (!ret) {
>		errno = ENOMEM;
>		return (smb_iconv_t)-1;
>	}
>	memset(ret, 0, sizeof(*ret));
>    talloc_set_destructor(ret, smb_iconv_t_destructor); 
>
>	/* check for the simplest null conversion */
>	if (strcmp(fromcode, tocode) == 0) {
>		ret->direct = iconv_copy;
>		return ret;
>	}
>
>	for (i=0;i<ARRAY_SIZE(builtin_functions);i++) {
>		if (strcasecmp(fromcode, builtin_functions[i].name) == 0) {
>			from = &builtin_functions[i];
>		}
>		if (strcasecmp(tocode, builtin_functions[i].name) == 0) {
>			to = &builtin_functions[i];
>		}
>	}
>
>	if (from == NULL) {
>		for (from=charsets; from; from=from->next) {
>			if (strcasecmp(from->name, fromcode) == 0) break;
>		}
>	}
>
>	if (to == NULL) {
>		for (to=charsets; to; to=to->next) {
>			if (strcasecmp(to->name, tocode) == 0) break;
>		}
>	}
>
>#ifdef HAVE_NATIVE_ICONV
>	if ((!from || !to) && !native_iconv) {
>		goto failed;
>	}
>	if (!from) {
>		ret->pull = sys_iconv;
>		ret->cd_pull = iconv_open("UTF-16LE", fromcode);
>		if (ret->cd_pull == (iconv_t)-1)
>			ret->cd_pull = iconv_open("UCS-2LE", fromcode);
>		if (ret->cd_pull == (iconv_t)-1) goto failed;
>	}
>
>	if (!to) {
>		ret->push = sys_iconv;
>		ret->cd_push = iconv_open(tocode, "UTF-16LE");
>		if (ret->cd_push == (iconv_t)-1)
>			ret->cd_push = iconv_open(tocode, "UCS-2LE");
>		if (ret->cd_push == (iconv_t)-1) goto failed;
>	}
>#else
>	if (!from || !to) {
>		goto failed;
>	}
>#endif
>
>	/* check for conversion to/from ucs2 */
>	if (is_utf16(fromcode) && to) {
>		ret->direct = to->push;
>		return ret;
>	}
>	if (is_utf16(tocode) && from) {
>		ret->direct = from->pull;
>		return ret;
>	}
>
>#ifdef HAVE_NATIVE_ICONV
>	if (is_utf16(fromcode)) {
>		ret->direct = sys_iconv;
>		ret->cd_direct = ret->cd_push;
>		ret->cd_push = NULL;
>		return ret;
>	}
>	if (is_utf16(tocode)) {
>		ret->direct = sys_iconv;
>        /* could be set just above - so we need to close iconv */
>        if (ret->cd_direct != NULL && ret->cd_direct != (iconv_t)-1)
>            iconv_close(ret->cd_direct);
>		ret->cd_direct = ret->cd_pull;
>		ret->cd_pull = NULL;
>		return ret;
>	}
>#endif
>
>	/* the general case has to go via a buffer */
>	if (!ret->pull) ret->pull = from->pull;
>	if (!ret->push) ret->push = to->push;
>	return ret;
>
>failed:
>	talloc_free(ret);
>	errno = EINVAL;
>	return (smb_iconv_t)-1;
>}
>
>/*
>  simple iconv_open() wrapper
> */
>_PUBLIC_ smb_iconv_t smb_iconv_open(const char *tocode, const char *fromcode)
>{
>	return smb_iconv_open_ex(talloc_autofree_context(), tocode, fromcode, true);
>}
>
>/*
>  simple iconv_close() wrapper
>*/
>_PUBLIC_ int smb_iconv_close(smb_iconv_t cd)
>{
>	talloc_free(cd);
>	return 0;
>}
>
>
>/**********************************************************************
> the following functions implement the builtin character sets in Samba
> and also the "test" character sets that are designed to test
> multi-byte character set support for english users
>***********************************************************************/
>static size_t ascii_pull(void *cd, const char **inbuf, size_t *inbytesleft,
>			 char **outbuf, size_t *outbytesleft)
>{
>	while (*inbytesleft >= 1 && *outbytesleft >= 2) {
>		(*outbuf)[0] = (*inbuf)[0];
>		(*outbuf)[1] = 0;
>		(*inbytesleft)  -= 1;
>		(*outbytesleft) -= 2;
>		(*inbuf)  += 1;
>		(*outbuf) += 2;
>	}
>
>	if (*inbytesleft > 0) {
>		errno = E2BIG;
>		return -1;
>	}
>	
>	return 0;
>}
>
>static size_t ascii_push(void *cd, const char **inbuf, size_t *inbytesleft,
>			 char **outbuf, size_t *outbytesleft)
>{
>	int ir_count=0;
>
>	while (*inbytesleft >= 2 && *outbytesleft >= 1) {
>		(*outbuf)[0] = (*inbuf)[0] & 0x7F;
>		if ((*inbuf)[1]) ir_count++;
>		(*inbytesleft)  -= 2;
>		(*outbytesleft) -= 1;
>		(*inbuf)  += 2;
>		(*outbuf) += 1;
>	}
>
>	if (*inbytesleft == 1) {
>		errno = EINVAL;
>		return -1;
>	}
>
>	if (*inbytesleft > 1) {
>		errno = E2BIG;
>		return -1;
>	}
>	
>	return ir_count;
>}
>
>
>static size_t ucs2hex_pull(void *cd, const char **inbuf, size_t *inbytesleft,
>			 char **outbuf, size_t *outbytesleft)
>{
>	while (*inbytesleft >= 1 && *outbytesleft >= 2) {
>		uint_t v;
>
>		if ((*inbuf)[0] != '@') {
>			/* seven bit ascii case */
>			(*outbuf)[0] = (*inbuf)[0];
>			(*outbuf)[1] = 0;
>			(*inbytesleft)  -= 1;
>			(*outbytesleft) -= 2;
>			(*inbuf)  += 1;
>			(*outbuf) += 2;
>			continue;
>		}
>		/* it's a hex character */
>		if (*inbytesleft < 5) {
>			errno = EINVAL;
>			return -1;
>		}
>		
>		if (sscanf(&(*inbuf)[1], "%04x", &v) != 1) {
>			errno = EILSEQ;
>			return -1;
>		}
>
>		(*outbuf)[0] = v&0xff;
>		(*outbuf)[1] = v>>8;
>		(*inbytesleft)  -= 5;
>		(*outbytesleft) -= 2;
>		(*inbuf)  += 5;
>		(*outbuf) += 2;
>	}
>
>	if (*inbytesleft > 0) {
>		errno = E2BIG;
>		return -1;
>	}
>	
>	return 0;
>}
>
>static size_t ucs2hex_push(void *cd, const char **inbuf, size_t *inbytesleft,
>			   char **outbuf, size_t *outbytesleft)
>{
>	while (*inbytesleft >= 2 && *outbytesleft >= 1) {
>		char buf[6];
>
>		if ((*inbuf)[1] == 0 && 
>		    ((*inbuf)[0] & 0x80) == 0 &&
>		    (*inbuf)[0] != '@') {
>			(*outbuf)[0] = (*inbuf)[0];
>			(*inbytesleft)  -= 2;
>			(*outbytesleft) -= 1;
>			(*inbuf)  += 2;
>			(*outbuf) += 1;
>			continue;
>		}
>		if (*outbytesleft < 5) {
>			errno = E2BIG;
>			return -1;
>		}
>		snprintf(buf, 6, "@%04x", SVAL(*inbuf, 0));
>		memcpy(*outbuf, buf, 5);
>		(*inbytesleft)  -= 2;
>		(*outbytesleft) -= 5;
>		(*inbuf)  += 2;
>		(*outbuf) += 5;
>	}
>
>	if (*inbytesleft == 1) {
>		errno = EINVAL;
>		return -1;
>	}
>
>	if (*inbytesleft > 1) {
>		errno = E2BIG;
>		return -1;
>	}
>	
>	return 0;
>}
>
>static size_t iconv_swab(void *cd, const char **inbuf, size_t *inbytesleft,
>			 char **outbuf, size_t *outbytesleft)
>{
>	int n;
>
>	n = MIN(*inbytesleft, *outbytesleft);
>
>	swab(*inbuf, *outbuf, (n&~1));
>	if (n&1) {
>		(*outbuf)[n-1] = 0;
>	}
>
>	(*inbytesleft) -= n;
>	(*outbytesleft) -= n;
>	(*inbuf) += n;
>	(*outbuf) += n;
>
>	if (*inbytesleft > 0) {
>		errno = E2BIG;
>		return -1;
>	}
>
>	return 0;
>}
>
>
>static size_t iconv_copy(void *cd, const char **inbuf, size_t *inbytesleft,
>			 char **outbuf, size_t *outbytesleft)
>{
>	int n;
>
>	n = MIN(*inbytesleft, *outbytesleft);
>
>	memmove(*outbuf, *inbuf, n);
>
>	(*inbytesleft) -= n;
>	(*outbytesleft) -= n;
>	(*inbuf) += n;
>	(*outbuf) += n;
>
>	if (*inbytesleft > 0) {
>		errno = E2BIG;
>		return -1;
>	}
>
>	return 0;
>}
>
>/*
>  this takes a UTF8 sequence and produces a UTF16 sequence
> */
>static size_t utf8_pull(void *cd, const char **inbuf, size_t *inbytesleft,
>			 char **outbuf, size_t *outbytesleft)
>{
>	size_t in_left=*inbytesleft, out_left=*outbytesleft;
>	const uint8_t *c = (const uint8_t *)*inbuf;
>	uint8_t *uc = (uint8_t *)*outbuf;
>
>	while (in_left >= 1 && out_left >= 2) {
>		if ((c[0] & 0x80) == 0) {
>			uc[0] = c[0];
>			uc[1] = 0;
>			c  += 1;
>			in_left  -= 1;
>			out_left -= 2;
>			uc += 2;
>			continue;
>		}
>
>		if ((c[0] & 0xe0) == 0xc0) {
>			if (in_left < 2 ||
>			    (c[1] & 0xc0) != 0x80) {
>				errno = EILSEQ;
>				goto error;
>			}
>			uc[1] = (c[0]>>2) & 0x7;
>			uc[0] = (c[0]<<6) | (c[1]&0x3f);
>			c  += 2;
>			in_left  -= 2;
>			out_left -= 2;
>			uc += 2;
>			continue;
>		}
>
>		if ((c[0] & 0xf0) == 0xe0) {
>			if (in_left < 3 ||
>			    (c[1] & 0xc0) != 0x80 || 
>			    (c[2] & 0xc0) != 0x80) {
>				errno = EILSEQ;
>				goto error;
>			}
>			uc[1] = ((c[0]&0xF)<<4) | ((c[1]>>2)&0xF);
>			uc[0] = (c[1]<<6) | (c[2]&0x3f);
>			c  += 3;
>			in_left  -= 3;
>			out_left -= 2;
>			uc += 2;
>			continue;
>		}
>
>		if ((c[0] & 0xf8) == 0xf0) {
>			unsigned int codepoint;
>			if (in_left < 4 ||
>			    (c[1] & 0xc0) != 0x80 || 
>			    (c[2] & 0xc0) != 0x80 ||
>			    (c[3] & 0xc0) != 0x80) {
>				errno = EILSEQ;
>				goto error;
>			}
>			codepoint = 
>				(c[3]&0x3f) | 
>				((c[2]&0x3f)<<6) | 
>				((c[1]&0x3f)<<12) |
>				((c[0]&0x7)<<18);
>			if (codepoint < 0x10000) {
>				/* accept UTF-8 characters that are not
>				   minimally packed, but pack the result */
>				uc[0] = (codepoint & 0xFF);
>				uc[1] = (codepoint >> 8);
>				c += 4;
>				in_left -= 4;
>				out_left -= 2;
>				uc += 2;
>				continue;
>			}
>
>			codepoint -= 0x10000;
>
>			if (out_left < 4) {
>				errno = E2BIG;
>				goto error;
>			}
>
>			uc[0] = (codepoint>>10) & 0xFF;
>			uc[1] = (codepoint>>18) | 0xd8;
>			uc[2] = codepoint & 0xFF;
>			uc[3] = ((codepoint>>8) & 0x3) | 0xdc;
>			c  += 4;
>			in_left  -= 4;
>			out_left -= 4;
>			uc += 4;
>			continue;
>		}
>
>		/* we don't handle 5 byte sequences */
>		errno = EINVAL;
>		goto error;
>	}
>
>	if (in_left > 0) {
>		errno = E2BIG;
>		goto error;
>	}
>
>	*inbytesleft = in_left;
>	*outbytesleft = out_left;
>	*inbuf = (const char *)c;
>	*outbuf = (char *)uc;
>	return 0;
>
>error:
>	*inbytesleft = in_left;
>	*outbytesleft = out_left;
>	*inbuf = (const char *)c;
>	*outbuf = (char *)uc;
>	return -1;
>}
>
>
>/*
>  this takes a UTF16 sequence and produces a UTF8 sequence
> */
>static size_t utf8_push(void *cd, const char **inbuf, size_t *inbytesleft,
>			char **outbuf, size_t *outbytesleft)
>{
>	size_t in_left=*inbytesleft, out_left=*outbytesleft;
>	uint8_t *c = (uint8_t *)*outbuf;
>	const uint8_t *uc = (const uint8_t *)*inbuf;
>
>	while (in_left >= 2 && out_left >= 1) {
>		unsigned int codepoint;
>
>		if (uc[1] == 0 && !(uc[0] & 0x80)) {
>			/* simplest case */
>			c[0] = uc[0];
>			in_left  -= 2;
>			out_left -= 1;
>			uc += 2;
>			c  += 1;
>			continue;
>		}
>
>		if ((uc[1]&0xf8) == 0) {
>			/* next simplest case */
>			if (out_left < 2) {
>				errno = E2BIG;
>				goto error;
>			}
>			c[0] = 0xc0 | (uc[0]>>6) | (uc[1]<<2);
>			c[1] = 0x80 | (uc[0] & 0x3f);
>			in_left  -= 2;
>			out_left -= 2;
>			uc += 2;
>			c  += 2;
>			continue;
>		}
>
>		if ((uc[1] & 0xfc) == 0xdc) {
>			/* its the second part of a 4 byte sequence. Illegal */
>			if (in_left < 4) {
>				errno = EINVAL;
>			} else {
>				errno = EILSEQ;
>			}
>			goto error;
>		}
>
>		if ((uc[1] & 0xfc) != 0xd8) {
>			codepoint = uc[0] | (uc[1]<<8);
>			if (out_left < 3) {
>				errno = E2BIG;
>				goto error;
>			}
>			c[0] = 0xe0 | (codepoint >> 12);
>			c[1] = 0x80 | ((codepoint >> 6) & 0x3f);
>			c[2] = 0x80 | (codepoint & 0x3f);
>			
>			in_left  -= 2;
>			out_left -= 3;
>			uc  += 2;
>			c   += 3;
>			continue;
>		}
>
>		/* its the first part of a 4 byte sequence */
>		if (in_left < 4) {
>			errno = EINVAL;
>			goto error;
>		}
>		if ((uc[3] & 0xfc) != 0xdc) {
>			errno = EILSEQ;
>			goto error;
>		}
>		codepoint = 0x10000 + (uc[2] | ((uc[3] & 0x3)<<8) | 
>				       (uc[0]<<10) | ((uc[1] & 0x3)<<18));
>		
>		if (out_left < 4) {
>			errno = E2BIG;
>			goto error;
>		}
>		c[0] = 0xf0 | (codepoint >> 18);
>		c[1] = 0x80 | ((codepoint >> 12) & 0x3f);
>		c[2] = 0x80 | ((codepoint >> 6) & 0x3f);
>		c[3] = 0x80 | (codepoint & 0x3f);
>		
>		in_left  -= 4;
>		out_left -= 4;
>		uc       += 4;
>		c        += 4;
>	}
>
>	if (in_left == 1) {
>		errno = EINVAL;
>		goto error;
>	}
>
>	if (in_left > 1) {
>		errno = E2BIG;
>		goto error;
>	}
>
>	*inbytesleft = in_left;
>	*outbytesleft = out_left;
>	*inbuf  = (const char *)uc;
>	*outbuf = (char *)c;
>	
>	return 0;
>
>error:
>	*inbytesleft = in_left;
>	*outbytesleft = out_left;
>	*inbuf  = (const char *)uc;
>	*outbuf = (char *)c;
>	return -1;
>}
>
>
>/*
>  this takes a UTF16 munged sequence, modifies it according to the
>  string2key rules, and produces a UTF16 sequence
>
>The rules are:
>
>    1) any 0x0000 characters are mapped to 0x0001
>
>    2) convert any instance of 0xD800 - 0xDBFF (high surrogate)
>       without an immediately following 0xDC00 - 0x0xDFFF (low surrogate) to
>       U+FFFD (OBJECT REPLACEMENT CHARACTER).
>
>    3) the same for any low surrogate that was not preceded by a high surrogate.
>
> */
>static size_t utf16_munged_pull(void *cd, const char **inbuf, size_t *inbytesleft,
>			       char **outbuf, size_t *outbytesleft)
>{
>	size_t in_left=*inbytesleft, out_left=*outbytesleft;
>	uint8_t *c = (uint8_t *)*outbuf;
>	const uint8_t *uc = (const uint8_t *)*inbuf;
>
>	while (in_left >= 2 && out_left >= 2) {
>		unsigned int codepoint = uc[0] | (uc[1]<<8);
>
>		if (codepoint == 0) {
>			codepoint = 1;
>		}
>
>		if ((codepoint & 0xfc00) == 0xd800) {
>			/* a high surrogate */
>			unsigned int codepoint2;
>			if (in_left < 4) {
>				codepoint = 0xfffd;
>				goto codepoint16;				
>			}
>			codepoint2 = uc[2] | (uc[3]<<8);
>			if ((codepoint2 & 0xfc00) != 0xdc00) {
>				/* high surrogate not followed by low
>				   surrogate: convert to 0xfffd */
>				codepoint = 0xfffd;
>				goto codepoint16;
>			}
>			if (out_left < 4) {
>				errno = E2BIG;
>				goto error;
>			}
>			memcpy(c, uc, 4);
>			in_left  -= 4;
>			out_left -= 4;
>			uc       += 4;
>			c        += 4;
>			continue;
>		}
>
>		if ((codepoint & 0xfc00) == 0xdc00) {
>			/* low surrogate not preceded by high
>			   surrogate: convert to 0xfffd */
>			codepoint = 0xfffd;
>		}
>
>	codepoint16:
>		c[0] = codepoint & 0xFF;
>		c[1] = (codepoint>>8) & 0xFF;
>		
>		in_left  -= 2;
>		out_left -= 2;
>		uc  += 2;
>		c   += 2;
>		continue;		
>	}
>
>	if (in_left == 1) {
>		errno = EINVAL;
>		goto error;
>	}
>
>	if (in_left > 1) {
>		errno = E2BIG;
>		goto error;
>	}
>
>	*inbytesleft = in_left;
>	*outbytesleft = out_left;
>	*inbuf  = (const char *)uc;
>	*outbuf = (char *)c;
>	
>	return 0;
>
>error:
>	*inbytesleft = in_left;
>	*outbytesleft = out_left;
>	*inbuf  = (const char *)uc;
>	*outbuf = (char *)c;
>	return -1;
>}
>
>
>

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Attachments on bug 6660: 4604 | 4605