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563 lines
12 KiB
C
563 lines
12 KiB
C
/* utf-8.c -- Basic UTF-8 routines */
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 1998-2011 The OpenLDAP Foundation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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/* Basic UTF-8 routines
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*
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* These routines are "dumb". Though they understand UTF-8,
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* they don't grok Unicode. That is, they can push bits,
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* but don't have a clue what the bits represent. That's
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* good enough for use with the LDAP Client SDK.
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*
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* These routines are not optimized.
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/stdlib.h>
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#include <ac/socket.h>
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#include <ac/string.h>
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#include <ac/time.h>
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#include "ldap_utf8.h"
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#include "ldap-int.h"
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#include "ldap_defaults.h"
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/*
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* return the number of bytes required to hold the
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* NULL-terminated UTF-8 string NOT INCLUDING the
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* termination.
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*/
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ber_len_t ldap_utf8_bytes( const char * p )
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{
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ber_len_t bytes;
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for( bytes=0; p[bytes]; bytes++ ) {
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/* EMPTY */ ;
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}
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return bytes;
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}
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ber_len_t ldap_utf8_chars( const char * p )
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{
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/* could be optimized and could check for invalid sequences */
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ber_len_t chars=0;
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for( ; *p ; LDAP_UTF8_INCR(p) ) {
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chars++;
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}
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return chars;
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}
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/* return offset to next character */
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int ldap_utf8_offset( const char * p )
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{
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return LDAP_UTF8_NEXT(p) - p;
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}
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/*
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* Returns length indicated by first byte.
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*/
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const char ldap_utf8_lentab[] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 0, 0 };
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int ldap_utf8_charlen( const char * p )
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{
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if (!(*p & 0x80))
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return 1;
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return ldap_utf8_lentab[*(const unsigned char *)p ^ 0x80];
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}
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/*
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* Make sure the UTF-8 char used the shortest possible encoding
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* returns charlen if valid, 0 if not.
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*
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* Here are the valid UTF-8 encodings, taken from RFC 2279 page 4.
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* The table is slightly modified from that of the RFC.
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*
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* UCS-4 range (hex) UTF-8 sequence (binary)
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* 0000 0000-0000 007F 0.......
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* 0000 0080-0000 07FF 110++++. 10......
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* 0000 0800-0000 FFFF 1110++++ 10+..... 10......
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* 0001 0000-001F FFFF 11110+++ 10++.... 10...... 10......
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* 0020 0000-03FF FFFF 111110++ 10+++... 10...... 10...... 10......
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* 0400 0000-7FFF FFFF 1111110+ 10++++.. 10...... 10...... 10...... 10......
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*
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* The '.' bits are "don't cares". When validating a UTF-8 sequence,
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* at least one of the '+' bits must be set, otherwise the character
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* should have been encoded in fewer octets. Note that in the two-octet
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* case, only the first octet needs to be validated, and this is done
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* in the ldap_utf8_lentab[] above.
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*/
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/* mask of required bits in second octet */
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#undef c
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#define c const char
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c ldap_utf8_mintab[] = {
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(c)0x20, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80,
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(c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80,
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(c)0x30, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80,
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(c)0x38, (c)0x80, (c)0x80, (c)0x80, (c)0x3c, (c)0x80, (c)0x00, (c)0x00 };
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#undef c
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int ldap_utf8_charlen2( const char * p )
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{
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int i = LDAP_UTF8_CHARLEN( p );
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if ( i > 2 ) {
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if ( !( ldap_utf8_mintab[*p & 0x1f] & p[1] ) )
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i = 0;
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}
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return i;
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}
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/* conv UTF-8 to UCS-4, useful for comparisons */
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ldap_ucs4_t ldap_x_utf8_to_ucs4( const char * p )
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{
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const unsigned char *c = (const unsigned char *) p;
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ldap_ucs4_t ch;
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int len, i;
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static unsigned char mask[] = {
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0, 0x7f, 0x1f, 0x0f, 0x07, 0x03, 0x01 };
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len = LDAP_UTF8_CHARLEN2(p, len);
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if( len == 0 ) return LDAP_UCS4_INVALID;
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ch = c[0] & mask[len];
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for(i=1; i < len; i++) {
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if ((c[i] & 0xc0) != 0x80) {
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return LDAP_UCS4_INVALID;
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}
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ch <<= 6;
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ch |= c[i] & 0x3f;
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}
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return ch;
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}
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/* conv UCS-4 to UTF-8, not used */
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int ldap_x_ucs4_to_utf8( ldap_ucs4_t c, char *buf )
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{
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int len=0;
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unsigned char* p = (unsigned char *) buf;
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/* not a valid Unicode character */
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if ( c < 0 ) return 0;
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/* Just return length, don't convert */
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if(buf == NULL) {
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if( c < 0x80 ) return 1;
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else if( c < 0x800 ) return 2;
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else if( c < 0x10000 ) return 3;
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else if( c < 0x200000 ) return 4;
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else if( c < 0x4000000 ) return 5;
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else return 6;
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}
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if( c < 0x80 ) {
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p[len++] = c;
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} else if( c < 0x800 ) {
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p[len++] = 0xc0 | ( c >> 6 );
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p[len++] = 0x80 | ( c & 0x3f );
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} else if( c < 0x10000 ) {
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p[len++] = 0xe0 | ( c >> 12 );
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p[len++] = 0x80 | ( (c >> 6) & 0x3f );
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p[len++] = 0x80 | ( c & 0x3f );
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} else if( c < 0x200000 ) {
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p[len++] = 0xf0 | ( c >> 18 );
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p[len++] = 0x80 | ( (c >> 12) & 0x3f );
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p[len++] = 0x80 | ( (c >> 6) & 0x3f );
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p[len++] = 0x80 | ( c & 0x3f );
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} else if( c < 0x4000000 ) {
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p[len++] = 0xf8 | ( c >> 24 );
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p[len++] = 0x80 | ( (c >> 18) & 0x3f );
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p[len++] = 0x80 | ( (c >> 12) & 0x3f );
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p[len++] = 0x80 | ( (c >> 6) & 0x3f );
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p[len++] = 0x80 | ( c & 0x3f );
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} else /* if( c < 0x80000000 ) */ {
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p[len++] = 0xfc | ( c >> 30 );
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p[len++] = 0x80 | ( (c >> 24) & 0x3f );
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p[len++] = 0x80 | ( (c >> 18) & 0x3f );
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p[len++] = 0x80 | ( (c >> 12) & 0x3f );
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p[len++] = 0x80 | ( (c >> 6) & 0x3f );
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p[len++] = 0x80 | ( c & 0x3f );
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}
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return len;
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}
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#define LDAP_UCS_UTF8LEN(c) \
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c < 0 ? 0 : (c < 0x80 ? 1 : (c < 0x800 ? 2 : (c < 0x10000 ? 3 : \
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(c < 0x200000 ? 4 : (c < 0x4000000 ? 5 : 6)))))
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/* Convert a string to UTF-8 format. The input string is expected to
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* have characters of 1, 2, or 4 octets (in network byte order)
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* corresponding to the ASN.1 T61STRING, BMPSTRING, and UNIVERSALSTRING
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* types respectively. (Here T61STRING just means that there is one
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* octet per character and characters may use the high bit of the octet.
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* The characters are assumed to use ISO mappings, no provision is made
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* for converting from T.61 coding rules to Unicode.)
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*/
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int
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ldap_ucs_to_utf8s( struct berval *ucs, int csize, struct berval *utf8s )
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{
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unsigned char *in, *end;
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char *ptr;
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ldap_ucs4_t u;
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int i, l = 0;
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utf8s->bv_val = NULL;
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utf8s->bv_len = 0;
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in = (unsigned char *)ucs->bv_val;
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/* Make sure we stop at an even multiple of csize */
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end = in + ( ucs->bv_len & ~(csize-1) );
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for (; in < end; ) {
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u = *in++;
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if (csize > 1) {
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u <<= 8;
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u |= *in++;
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}
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if (csize > 2) {
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u <<= 8;
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u |= *in++;
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u <<= 8;
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u |= *in++;
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}
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i = LDAP_UCS_UTF8LEN(u);
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if (i == 0)
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return LDAP_INVALID_SYNTAX;
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l += i;
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}
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utf8s->bv_val = LDAP_MALLOC( l+1 );
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if (utf8s->bv_val == NULL)
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return LDAP_NO_MEMORY;
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utf8s->bv_len = l;
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ptr = utf8s->bv_val;
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for (in = (unsigned char *)ucs->bv_val; in < end; ) {
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u = *in++;
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if (csize > 1) {
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u <<= 8;
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u |= *in++;
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}
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if (csize > 2) {
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u <<= 8;
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u |= *in++;
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u <<= 8;
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u |= *in++;
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}
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ptr += ldap_x_ucs4_to_utf8(u, ptr);
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}
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*ptr = '\0';
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return LDAP_SUCCESS;
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}
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/*
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* Advance to the next UTF-8 character
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*
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* Ignores length of multibyte character, instead rely on
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* continuation markers to find start of next character.
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* This allows for "resyncing" of when invalid characters
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* are provided provided the start of the next character
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* is appears within the 6 bytes examined.
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*/
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char* ldap_utf8_next( const char * p )
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{
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int i;
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const unsigned char *u = (const unsigned char *) p;
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if( LDAP_UTF8_ISASCII(u) ) {
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return (char *) &p[1];
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}
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for( i=1; i<6; i++ ) {
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if ( ( u[i] & 0xc0 ) != 0x80 ) {
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return (char *) &p[i];
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}
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}
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return (char *) &p[i];
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}
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/*
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* Advance to the previous UTF-8 character
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*
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* Ignores length of multibyte character, instead rely on
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* continuation markers to find start of next character.
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* This allows for "resyncing" of when invalid characters
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* are provided provided the start of the next character
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* is appears within the 6 bytes examined.
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*/
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char* ldap_utf8_prev( const char * p )
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{
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int i;
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const unsigned char *u = (const unsigned char *) p;
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for( i=-1; i>-6 ; i-- ) {
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if ( ( u[i] & 0xc0 ) != 0x80 ) {
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return (char *) &p[i];
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}
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}
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return (char *) &p[i];
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}
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/*
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* Copy one UTF-8 character from src to dst returning
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* number of bytes copied.
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*
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* Ignores length of multibyte character, instead rely on
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* continuation markers to find start of next character.
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* This allows for "resyncing" of when invalid characters
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* are provided provided the start of the next character
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* is appears within the 6 bytes examined.
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*/
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int ldap_utf8_copy( char* dst, const char *src )
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{
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int i;
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const unsigned char *u = (const unsigned char *) src;
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dst[0] = src[0];
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if( LDAP_UTF8_ISASCII(u) ) {
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return 1;
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}
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for( i=1; i<6; i++ ) {
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if ( ( u[i] & 0xc0 ) != 0x80 ) {
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return i;
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}
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dst[i] = src[i];
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}
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return i;
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}
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#ifndef UTF8_ALPHA_CTYPE
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/*
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* UTF-8 ctype routines
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* Only deals with characters < 0x80 (ie: US-ASCII)
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*/
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int ldap_utf8_isascii( const char * p )
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{
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unsigned c = * (const unsigned char *) p;
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return LDAP_ASCII(c);
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}
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int ldap_utf8_isdigit( const char * p )
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{
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unsigned c = * (const unsigned char *) p;
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if(!LDAP_ASCII(c)) return 0;
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return LDAP_DIGIT( c );
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}
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int ldap_utf8_isxdigit( const char * p )
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{
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unsigned c = * (const unsigned char *) p;
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if(!LDAP_ASCII(c)) return 0;
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return LDAP_HEX(c);
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}
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int ldap_utf8_isspace( const char * p )
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{
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unsigned c = * (const unsigned char *) p;
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if(!LDAP_ASCII(c)) return 0;
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switch(c) {
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case ' ':
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case '\t':
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case '\n':
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case '\r':
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case '\v':
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case '\f':
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return 1;
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}
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return 0;
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}
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/*
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* These are not needed by the C SDK and are
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* not "good enough" for general use.
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*/
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int ldap_utf8_isalpha( const char * p )
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{
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unsigned c = * (const unsigned char *) p;
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if(!LDAP_ASCII(c)) return 0;
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return LDAP_ALPHA(c);
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}
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int ldap_utf8_isalnum( const char * p )
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{
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unsigned c = * (const unsigned char *) p;
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if(!LDAP_ASCII(c)) return 0;
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return LDAP_ALNUM(c);
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}
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int ldap_utf8_islower( const char * p )
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{
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unsigned c = * (const unsigned char *) p;
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if(!LDAP_ASCII(c)) return 0;
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return LDAP_LOWER(c);
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}
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int ldap_utf8_isupper( const char * p )
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{
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unsigned c = * (const unsigned char *) p;
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if(!LDAP_ASCII(c)) return 0;
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return LDAP_UPPER(c);
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}
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#endif
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/*
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* UTF-8 string routines
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*/
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/* like strchr() */
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char * (ldap_utf8_strchr)( const char *str, const char *chr )
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{
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for( ; *str != '\0'; LDAP_UTF8_INCR(str) ) {
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if( ldap_x_utf8_to_ucs4( str ) == ldap_x_utf8_to_ucs4( chr ) ) {
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return (char *) str;
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}
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}
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return NULL;
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}
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/* like strcspn() but returns number of bytes, not characters */
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ber_len_t (ldap_utf8_strcspn)( const char *str, const char *set )
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{
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const char *cstr;
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const char *cset;
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for( cstr = str; *cstr != '\0'; LDAP_UTF8_INCR(cstr) ) {
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for( cset = set; *cset != '\0'; LDAP_UTF8_INCR(cset) ) {
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if( ldap_x_utf8_to_ucs4( cstr ) == ldap_x_utf8_to_ucs4( cset ) ) {
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return cstr - str;
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}
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}
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}
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return cstr - str;
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}
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/* like strspn() but returns number of bytes, not characters */
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ber_len_t (ldap_utf8_strspn)( const char *str, const char *set )
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{
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const char *cstr;
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const char *cset;
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for( cstr = str; *cstr != '\0'; LDAP_UTF8_INCR(cstr) ) {
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for( cset = set; ; LDAP_UTF8_INCR(cset) ) {
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if( *cset == '\0' ) {
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return cstr - str;
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}
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if( ldap_x_utf8_to_ucs4( cstr ) == ldap_x_utf8_to_ucs4( cset ) ) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return cstr - str;
|
|
}
|
|
|
|
/* like strpbrk(), replaces strchr() as well */
|
|
char *(ldap_utf8_strpbrk)( const char *str, const char *set )
|
|
{
|
|
for( ; *str != '\0'; LDAP_UTF8_INCR(str) ) {
|
|
const char *cset;
|
|
|
|
for( cset = set; *cset != '\0'; LDAP_UTF8_INCR(cset) ) {
|
|
if( ldap_x_utf8_to_ucs4( str ) == ldap_x_utf8_to_ucs4( cset ) ) {
|
|
return (char *) str;
|
|
}
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* like strtok_r(), not strtok() */
|
|
char *(ldap_utf8_strtok)(char *str, const char *sep, char **last)
|
|
{
|
|
char *begin;
|
|
char *end;
|
|
|
|
if( last == NULL ) return NULL;
|
|
|
|
begin = str ? str : *last;
|
|
|
|
begin += ldap_utf8_strspn( begin, sep );
|
|
|
|
if( *begin == '\0' ) {
|
|
*last = NULL;
|
|
return NULL;
|
|
}
|
|
|
|
end = &begin[ ldap_utf8_strcspn( begin, sep ) ];
|
|
|
|
if( *end != '\0' ) {
|
|
char *next = LDAP_UTF8_NEXT( end );
|
|
*end = '\0';
|
|
end = next;
|
|
}
|
|
|
|
*last = end;
|
|
return begin;
|
|
}
|