mirror of
https://git.openldap.org/openldap/openldap.git
synced 2024-12-21 03:10:25 +08:00
462 lines
8.6 KiB
C
462 lines
8.6 KiB
C
/* $OpenLDAP$ */
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/*
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* Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
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* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
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*/
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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-int.h"
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#include "ldap_defaults.h"
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#undef ISASCII
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#define ISASCII(uc) ((uc) < 0x100)
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#undef UCS4_INVALID
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#define UCS4_INVALID 0x80000000U
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/*
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* Basic UTF-8 routines
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*/
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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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* This function should use a table lookup.
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*/
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int ldap_utf8_charlen( const char * p )
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{
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unsigned c = * (const unsigned char *) p;
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if ((c & 0xfe ) == 0xfc) {
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return 6;
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}
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if ((c & 0xfc ) == 0xf8) {
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return 5;
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}
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if ((c & 0xf8 ) == 0xf0) {
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return 4;
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}
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if ((c & 0xf0 ) == 0xe0) {
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return 3;
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}
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if ((c & 0xe0 ) == 0xc0) {
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return 2;
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}
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if ((c & 0x80 ) == 0x80) {
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/* INVALID */
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return 0;
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}
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return 1;
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}
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/* conv UTF-8 to UCS-4, useful for comparisons */
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ber_int_t ldap_utf8_to_ucs4( const char * p )
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{
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const unsigned char *c = p;
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ber_int_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_CHARLEN(p);
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if( len == 0 ) return 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 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_ucs4_to_utf8( ber_int_t c, char *buf )
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{
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int len=0;
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unsigned char* p = buf;
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if(buf == NULL) return 0;
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if ( c < 0 ) {
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/* not a valid Unicode character */
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} else 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 < 0x400000 ) {
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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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buf[len] = '\0';
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return len;
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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 = 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 = 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 = 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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/*
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* UTF-8 ctype routines
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* Only deals with characters < 0x100 (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 ISASCII(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(!ISASCII(c)) return 0;
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return c >= '0' && c <= '9';
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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(!ISASCII(c)) return 0;
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return ( c >= '0' && c <= '9' )
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|| ( c >= 'A' && c <= 'F' )
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|| ( c >= 'a' && c <= 'f' );
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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(!ISASCII(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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#ifndef UTF8_ALPHA_CTYPE
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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(!ISASCII(c)) return 0;
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return ( c >= 'A' && c <= 'Z' )
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|| ( c >= 'a' && c <= 'z' );
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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(!ISASCII(c)) return 0;
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return ( c >= '0' && c <= '9' )
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|| ( c >= 'A' && c <= 'Z' )
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|| ( c >= 'a' && c <= 'z' );
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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(!ISASCII(c)) return 0;
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return ( c >= 'a' && c <= 'z' );
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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(!ISASCII(c)) return 0;
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return ( c >= 'A' && c <= 'Z' );
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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_utf8_to_ucs4( str ) == ldap_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_utf8_to_ucs4( cstr ) == ldap_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_utf8_to_ucs4( cstr ) == ldap_utf8_to_ucs4( cset ) ) {
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break;
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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 strpbrk(), replaces strchr() as well */
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char *(ldap_utf8_strpbrk)( const char *str, const char *set )
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{
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for( ; *str != '\0'; LDAP_UTF8_INCR(str) ) {
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const char *cset;
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for( cset = set; *cset != '\0'; LDAP_UTF8_INCR(cset) ) {
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if( ldap_utf8_to_ucs4( str ) == ldap_utf8_to_ucs4( cset ) ) {
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return (char *) str;
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}
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}
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}
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return NULL;
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}
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/* like strtok_r(), not strtok() */
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char *(ldap_utf8_strtok)(char *str, const char *sep, char **last)
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{
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char *begin;
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char *end;
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if( last == NULL ) return NULL;
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begin = str ? str : *last;
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begin += ldap_utf8_strspn( begin, sep );
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if( *begin == '\0' ) {
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*last = NULL;
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return NULL;
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}
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end = &begin[ ldap_utf8_strcspn( begin, sep ) ];
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if( *end != '\0' ) {
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char *next = LDAP_UTF8_NEXT( end );
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*end = '\0';
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end = next;
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}
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*last = end;
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return begin;
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}
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