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-rw-r--r--libraries/libldap/utf-8-conv.c485
1 files changed, 485 insertions, 0 deletions
diff --git a/libraries/libldap/utf-8-conv.c b/libraries/libldap/utf-8-conv.c
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+++ b/libraries/libldap/utf-8-conv.c
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+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2018 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+/* Portions Copyright (C) 1999, 2000 Novell, Inc. All Rights Reserved.
+ *
+ * THIS WORK IS SUBJECT TO U.S. AND INTERNATIONAL COPYRIGHT LAWS AND
+ * TREATIES. USE, MODIFICATION, AND REDISTRIBUTION OF THIS WORK IS SUBJECT
+ * TO VERSION 2.0.1 OF THE OPENLDAP PUBLIC LICENSE, A COPY OF WHICH IS
+ * AVAILABLE AT HTTP://WWW.OPENLDAP.ORG/LICENSE.HTML OR IN THE FILE "LICENSE"
+ * IN THE TOP-LEVEL DIRECTORY OF THE DISTRIBUTION. ANY USE OR EXPLOITATION
+ * OF THIS WORK OTHER THAN AS AUTHORIZED IN VERSION 2.0.1 OF THE OPENLDAP
+ * PUBLIC LICENSE, OR OTHER PRIOR WRITTEN CONSENT FROM NOVELL, COULD SUBJECT
+ * THE PERPETRATOR TO CRIMINAL AND CIVIL LIABILITY.
+ *---
+ * Note: A verbatim copy of version 2.0.1 of the OpenLDAP Public License
+ * can be found in the file "build/LICENSE-2.0.1" in this distribution
+ * of OpenLDAP Software.
+ */
+
+/*
+ * UTF-8 Conversion Routines
+ *
+ * These routines convert between Wide Character and UTF-8,
+ * or between MultiByte and UTF-8 encodings.
+ *
+ * Both single character and string versions of the functions are provided.
+ * All functions return -1 if the character or string cannot be converted.
+ */
+
+#include "portable.h"
+
+#if SIZEOF_WCHAR_T >= 4
+/* These routines assume ( sizeof(wchar_t) >= 4 ) */
+
+#include <stdio.h>
+#include <ac/stdlib.h> /* For wctomb, wcstombs, mbtowc, mbstowcs */
+#include <ac/string.h>
+#include <ac/time.h> /* for time_t */
+
+#include "ldap-int.h"
+
+#include <ldap_utf8.h>
+
+static unsigned char mask[] = { 0, 0x7f, 0x1f, 0x0f, 0x07, 0x03, 0x01 };
+
+
+/*-----------------------------------------------------------------------------
+ UTF-8 Format Summary
+
+ASCII chars 7 bits
+ 0xxxxxxx
+
+2-character UTF-8 sequence: 11 bits
+ 110xxxxx 10xxxxxx
+
+3-character UTF-8 16 bits
+ 1110xxxx 10xxxxxx 10xxxxxx
+
+4-char UTF-8 21 bits
+ 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
+
+5-char UTF-8 26 bits
+ 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
+
+6-char UTF-8 31 bits
+ 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
+
+Unicode address space (0 - 0x10FFFF) 21 bits
+ISO-10646 address space (0 - 0x7FFFFFFF) 31 bits
+
+Note: This code does not prevent UTF-8 sequences which are longer than
+ necessary from being decoded.
+*/
+
+/*-----------------------------------------------------------------------------
+ Convert a UTF-8 character to a wide char.
+ Return the length of the UTF-8 input character in bytes.
+*/
+int
+ldap_x_utf8_to_wc ( wchar_t *wchar, const char *utf8char )
+{
+ int utflen, i;
+ wchar_t ch;
+
+ if (utf8char == NULL) return -1;
+
+ /* Get UTF-8 sequence length from 1st byte */
+ utflen = LDAP_UTF8_CHARLEN2(utf8char, utflen);
+
+ if( utflen==0 || utflen > (int)LDAP_MAX_UTF8_LEN ) return -1;
+
+ /* First byte minus length tag */
+ ch = (wchar_t)(utf8char[0] & mask[utflen]);
+
+ for(i=1; i < utflen; i++) {
+ /* Subsequent bytes must start with 10 */
+ if ((utf8char[i] & 0xc0) != 0x80) return -1;
+
+ ch <<= 6; /* 6 bits of data in each subsequent byte */
+ ch |= (wchar_t)(utf8char[i] & 0x3f);
+ }
+
+ if (wchar) *wchar = ch;
+
+ return utflen;
+}
+
+/*-----------------------------------------------------------------------------
+ Convert a UTF-8 string to a wide char string.
+ No more than 'count' wide chars will be written to the output buffer.
+ Return the size of the converted string in wide chars, excl null terminator.
+*/
+int
+ldap_x_utf8s_to_wcs ( wchar_t *wcstr, const char *utf8str, size_t count )
+{
+ size_t wclen = 0;
+ int utflen, i;
+ wchar_t ch;
+
+
+ /* If input ptr is NULL or empty... */
+ if (utf8str == NULL || !*utf8str) {
+ if ( wcstr )
+ *wcstr = 0;
+ return 0;
+ }
+
+ /* Examine next UTF-8 character. If output buffer is NULL, ignore count */
+ while ( *utf8str && (wcstr==NULL || wclen<count) ) {
+ /* Get UTF-8 sequence length from 1st byte */
+ utflen = LDAP_UTF8_CHARLEN2(utf8str, utflen);
+
+ if( utflen==0 || utflen > (int)LDAP_MAX_UTF8_LEN ) return -1;
+
+ /* First byte minus length tag */
+ ch = (wchar_t)(utf8str[0] & mask[utflen]);
+
+ for(i=1; i < utflen; i++) {
+ /* Subsequent bytes must start with 10 */
+ if ((utf8str[i] & 0xc0) != 0x80) return -1;
+
+ ch <<= 6; /* 6 bits of data in each subsequent byte */
+ ch |= (wchar_t)(utf8str[i] & 0x3f);
+ }
+
+ if (wcstr) wcstr[wclen] = ch;
+
+ utf8str += utflen; /* Move to next UTF-8 character */
+ wclen++; /* Count number of wide chars stored/required */
+ }
+
+ /* Add null terminator if there's room in the buffer. */
+ if (wcstr && wclen < count) wcstr[wclen] = 0;
+
+ return wclen;
+}
+
+
+/*-----------------------------------------------------------------------------
+ Convert one wide char to a UTF-8 character.
+ Return the length of the converted UTF-8 character in bytes.
+ No more than 'count' bytes will be written to the output buffer.
+*/
+int
+ldap_x_wc_to_utf8 ( char *utf8char, wchar_t wchar, size_t count )
+{
+ int len=0;
+
+ if (utf8char == NULL) /* Just determine the required UTF-8 char length. */
+ { /* Ignore count */
+ if( wchar < 0 )
+ return -1;
+ if( wchar < 0x80 )
+ return 1;
+ if( wchar < 0x800 )
+ return 2;
+ if( wchar < 0x10000 )
+ return 3;
+ if( wchar < 0x200000 )
+ return 4;
+ if( wchar < 0x4000000 )
+ return 5;
+#if SIZEOF_WCHAR_T > 4
+ /* UL is not strictly needed by ANSI C */
+ if( wchar < (wchar_t)0x80000000UL )
+#endif /* SIZEOF_WCHAR_T > 4 */
+ return 6;
+ return -1;
+ }
+
+
+ if ( wchar < 0 ) { /* Invalid wide character */
+ len = -1;
+
+ } else if( wchar < 0x80 ) {
+ if (count >= 1) {
+ utf8char[len++] = (char)wchar;
+ }
+
+ } else if( wchar < 0x800 ) {
+ if (count >=2) {
+ utf8char[len++] = 0xc0 | ( wchar >> 6 );
+ utf8char[len++] = 0x80 | ( wchar & 0x3f );
+ }
+
+ } else if( wchar < 0x10000 ) {
+ if (count >= 3) {
+ utf8char[len++] = 0xe0 | ( wchar >> 12 );
+ utf8char[len++] = 0x80 | ( (wchar >> 6) & 0x3f );
+ utf8char[len++] = 0x80 | ( wchar & 0x3f );
+ }
+
+ } else if( wchar < 0x200000 ) {
+ if (count >= 4) {
+ utf8char[len++] = 0xf0 | ( wchar >> 18 );
+ utf8char[len++] = 0x80 | ( (wchar >> 12) & 0x3f );
+ utf8char[len++] = 0x80 | ( (wchar >> 6) & 0x3f );
+ utf8char[len++] = 0x80 | ( wchar & 0x3f );
+ }
+
+ } else if( wchar < 0x4000000 ) {
+ if (count >= 5) {
+ utf8char[len++] = 0xf8 | ( wchar >> 24 );
+ utf8char[len++] = 0x80 | ( (wchar >> 18) & 0x3f );
+ utf8char[len++] = 0x80 | ( (wchar >> 12) & 0x3f );
+ utf8char[len++] = 0x80 | ( (wchar >> 6) & 0x3f );
+ utf8char[len++] = 0x80 | ( wchar & 0x3f );
+ }
+
+ } else
+#if SIZEOF_WCHAR_T > 4
+ /* UL is not strictly needed by ANSI C */
+ if( wchar < (wchar_t)0x80000000UL )
+#endif /* SIZEOF_WCHAR_T > 4 */
+ {
+ if (count >= 6) {
+ utf8char[len++] = 0xfc | ( wchar >> 30 );
+ utf8char[len++] = 0x80 | ( (wchar >> 24) & 0x3f );
+ utf8char[len++] = 0x80 | ( (wchar >> 18) & 0x3f );
+ utf8char[len++] = 0x80 | ( (wchar >> 12) & 0x3f );
+ utf8char[len++] = 0x80 | ( (wchar >> 6) & 0x3f );
+ utf8char[len++] = 0x80 | ( wchar & 0x3f );
+ }
+
+#if SIZEOF_WCHAR_T > 4
+ } else {
+ len = -1;
+#endif /* SIZEOF_WCHAR_T > 4 */
+ }
+
+ return len;
+
+}
+
+
+/*-----------------------------------------------------------------------------
+ Convert a wide char string to a UTF-8 string.
+ No more than 'count' bytes will be written to the output buffer.
+ Return the # of bytes written to the output buffer, excl null terminator.
+*/
+int
+ldap_x_wcs_to_utf8s ( char *utf8str, const wchar_t *wcstr, size_t count )
+{
+ int len = 0;
+ int n;
+ char *p = utf8str;
+ wchar_t empty = 0; /* To avoid use of L"" construct */
+
+ if (wcstr == NULL) /* Treat input ptr NULL as an empty string */
+ wcstr = &empty;
+
+ if (utf8str == NULL) /* Just compute size of output, excl null */
+ {
+ while (*wcstr)
+ {
+ /* Get UTF-8 size of next wide char */
+ n = ldap_x_wc_to_utf8( NULL, *wcstr++, LDAP_MAX_UTF8_LEN);
+ if (n == -1)
+ return -1;
+ len += n;
+ }
+
+ return len;
+ }
+
+
+ /* Do the actual conversion. */
+
+ n = 1; /* In case of empty wcstr */
+ while (*wcstr)
+ {
+ n = ldap_x_wc_to_utf8( p, *wcstr++, count);
+
+ if (n <= 0) /* If encoding error (-1) or won't fit (0), quit */
+ break;
+
+ p += n;
+ count -= n; /* Space left in output buffer */
+ }
+
+ /* If not enough room for last character, pad remainder with null
+ so that return value = original count, indicating buffer full. */
+ if (n == 0)
+ {
+ while (count--)
+ *p++ = 0;
+ }
+
+ /* Add a null terminator if there's room. */
+ else if (count)
+ *p = 0;
+
+ if (n == -1) /* Conversion encountered invalid wide char. */
+ return -1;
+
+ /* Return the number of bytes written to output buffer, excl null. */
+ return (p - utf8str);
+}
+
+#ifdef ANDROID
+int wctomb(char *s, wchar_t wc) { return wcrtomb(s,wc,NULL); }
+int mbtowc(wchar_t *pwc, const char *s, size_t n) { return mbrtowc(pwc, s, n, NULL); }
+#endif
+
+/*-----------------------------------------------------------------------------
+ Convert a UTF-8 character to a MultiByte character.
+ Return the size of the converted character in bytes.
+*/
+int
+ldap_x_utf8_to_mb ( char *mbchar, const char *utf8char,
+ int (*f_wctomb)(char *mbchar, wchar_t wchar) )
+{
+ wchar_t wchar;
+ int n;
+ char tmp[6]; /* Large enough for biggest multibyte char */
+
+ if (f_wctomb == NULL) /* If no conversion function was given... */
+ f_wctomb = wctomb; /* use the local ANSI C function */
+
+ /* First convert UTF-8 char to a wide char */
+ n = ldap_x_utf8_to_wc( &wchar, utf8char);
+
+ if (n == -1)
+ return -1; /* Invalid UTF-8 character */
+
+ if (mbchar == NULL)
+ n = f_wctomb( tmp, wchar );
+ else
+ n = f_wctomb( mbchar, wchar);
+
+ return n;
+}
+
+/*-----------------------------------------------------------------------------
+ Convert a UTF-8 string to a MultiByte string.
+ No more than 'count' bytes will be written to the output buffer.
+ Return the size of the converted string in bytes, excl null terminator.
+*/
+int
+ldap_x_utf8s_to_mbs ( char *mbstr, const char *utf8str, size_t count,
+ size_t (*f_wcstombs)(char *mbstr, const wchar_t *wcstr, size_t count) )
+{
+ wchar_t *wcs;
+ size_t wcsize;
+ int n;
+
+ if (f_wcstombs == NULL) /* If no conversion function was given... */
+ f_wcstombs = wcstombs; /* use the local ANSI C function */
+
+ if (utf8str == NULL || *utf8str == 0) /* NULL or empty input string */
+ {
+ if (mbstr)
+ *mbstr = 0;
+ return 0;
+ }
+
+/* Allocate memory for the maximum size wchar string that we could get. */
+ wcsize = strlen(utf8str) + 1;
+ wcs = (wchar_t *)LDAP_MALLOC(wcsize * sizeof(wchar_t));
+ if (wcs == NULL)
+ return -1; /* Memory allocation failure. */
+
+ /* First convert the UTF-8 string to a wide char string */
+ n = ldap_x_utf8s_to_wcs( wcs, utf8str, wcsize);
+
+ /* Then convert wide char string to multi-byte string */
+ if (n != -1)
+ {
+ n = f_wcstombs(mbstr, wcs, count);
+ }
+
+ LDAP_FREE(wcs);
+
+ return n;
+}
+
+/*-----------------------------------------------------------------------------
+ Convert a MultiByte character to a UTF-8 character.
+ 'mbsize' indicates the number of bytes of 'mbchar' to check.
+ Returns the number of bytes written to the output character.
+*/
+int
+ldap_x_mb_to_utf8 ( char *utf8char, const char *mbchar, size_t mbsize,
+ int (*f_mbtowc)(wchar_t *wchar, const char *mbchar, size_t count) )
+{
+ wchar_t wchar;
+ int n;
+
+ if (f_mbtowc == NULL) /* If no conversion function was given... */
+ f_mbtowc = mbtowc; /* use the local ANSI C function */
+
+ if (mbsize == 0) /* 0 is not valid. */
+ return -1;
+
+ if (mbchar == NULL || *mbchar == 0)
+ {
+ if (utf8char)
+ *utf8char = 0;
+ return 1;
+ }
+
+ /* First convert the MB char to a Wide Char */
+ n = f_mbtowc( &wchar, mbchar, mbsize);
+
+ if (n == -1)
+ return -1;
+
+ /* Convert the Wide Char to a UTF-8 character. */
+ n = ldap_x_wc_to_utf8( utf8char, wchar, LDAP_MAX_UTF8_LEN);
+
+ return n;
+}
+
+
+/*-----------------------------------------------------------------------------
+ Convert a MultiByte string to a UTF-8 string.
+ No more than 'count' bytes will be written to the output buffer.
+ Return the size of the converted string in bytes, excl null terminator.
+*/
+int
+ldap_x_mbs_to_utf8s ( char *utf8str, const char *mbstr, size_t count,
+ size_t (*f_mbstowcs)(wchar_t *wcstr, const char *mbstr, size_t count) )
+{
+ wchar_t *wcs;
+ int n;
+ size_t wcsize;
+
+ if (mbstr == NULL) /* Treat NULL input string as an empty string */
+ mbstr = "";
+
+ if (f_mbstowcs == NULL) /* If no conversion function was given... */
+ f_mbstowcs = mbstowcs; /* use the local ANSI C function */
+
+ /* Allocate memory for the maximum size wchar string that we could get. */
+ wcsize = strlen(mbstr) + 1;
+ wcs = (wchar_t *)LDAP_MALLOC( wcsize * sizeof(wchar_t) );
+ if (wcs == NULL)
+ return -1;
+
+ /* First convert multi-byte string to a wide char string */
+ n = f_mbstowcs(wcs, mbstr, wcsize);
+
+ /* Convert wide char string to UTF-8 string */
+ if (n != -1)
+ {
+ n = ldap_x_wcs_to_utf8s( utf8str, wcs, count);
+ }
+
+ LDAP_FREE(wcs);
+
+ return n;
+}
+
+#endif /* SIZEOF_WCHAR_T >= 4 */
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