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-rw-r--r--libraries/libldap/utf-8.c562
1 files changed, 562 insertions, 0 deletions
diff --git a/libraries/libldap/utf-8.c b/libraries/libldap/utf-8.c
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+++ b/libraries/libldap/utf-8.c
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+/* utf-8.c -- Basic UTF-8 routines */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2022 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>.
+ */
+/* Basic UTF-8 routines
+ *
+ * These routines are "dumb". Though they understand UTF-8,
+ * they don't grok Unicode. That is, they can push bits,
+ * but don't have a clue what the bits represent. That's
+ * good enough for use with the LDAP Client SDK.
+ *
+ * These routines are not optimized.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/stdlib.h>
+
+#include <ac/socket.h>
+#include <ac/string.h>
+#include <ac/time.h>
+
+#include "ldap_utf8.h"
+
+#include "ldap-int.h"
+#include "ldap_defaults.h"
+
+/*
+ * return the number of bytes required to hold the
+ * NULL-terminated UTF-8 string NOT INCLUDING the
+ * termination.
+ */
+ber_len_t ldap_utf8_bytes( const char * p )
+{
+ ber_len_t bytes;
+
+ for( bytes=0; p[bytes]; bytes++ ) {
+ /* EMPTY */ ;
+ }
+
+ return bytes;
+}
+
+ber_len_t ldap_utf8_chars( const char * p )
+{
+ /* could be optimized and could check for invalid sequences */
+ ber_len_t chars=0;
+
+ for( ; *p ; LDAP_UTF8_INCR(p) ) {
+ chars++;
+ }
+
+ return chars;
+}
+
+/* return offset to next character */
+int ldap_utf8_offset( const char * p )
+{
+ return LDAP_UTF8_NEXT(p) - p;
+}
+
+/*
+ * Returns length indicated by first byte.
+ */
+const char ldap_utf8_lentab[] = {
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 0, 0 };
+
+int ldap_utf8_charlen( const char * p )
+{
+ if (!(*p & 0x80))
+ return 1;
+
+ return ldap_utf8_lentab[*(const unsigned char *)p ^ 0x80];
+}
+
+/*
+ * Make sure the UTF-8 char used the shortest possible encoding
+ * returns charlen if valid, 0 if not.
+ *
+ * Here are the valid UTF-8 encodings, taken from RFC 2279 page 4.
+ * The table is slightly modified from that of the RFC.
+ *
+ * UCS-4 range (hex) UTF-8 sequence (binary)
+ * 0000 0000-0000 007F 0.......
+ * 0000 0080-0000 07FF 110++++. 10......
+ * 0000 0800-0000 FFFF 1110++++ 10+..... 10......
+ * 0001 0000-001F FFFF 11110+++ 10++.... 10...... 10......
+ * 0020 0000-03FF FFFF 111110++ 10+++... 10...... 10...... 10......
+ * 0400 0000-7FFF FFFF 1111110+ 10++++.. 10...... 10...... 10...... 10......
+ *
+ * The '.' bits are "don't cares". When validating a UTF-8 sequence,
+ * at least one of the '+' bits must be set, otherwise the character
+ * should have been encoded in fewer octets. Note that in the two-octet
+ * case, only the first octet needs to be validated, and this is done
+ * in the ldap_utf8_lentab[] above.
+ */
+
+/* mask of required bits in second octet */
+#undef c
+#define c const char
+c ldap_utf8_mintab[] = {
+ (c)0x20, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80,
+ (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80,
+ (c)0x30, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80, (c)0x80,
+ (c)0x38, (c)0x80, (c)0x80, (c)0x80, (c)0x3c, (c)0x80, (c)0x00, (c)0x00 };
+#undef c
+
+int ldap_utf8_charlen2( const char * p )
+{
+ int i = LDAP_UTF8_CHARLEN( p );
+
+ if ( i > 2 ) {
+ if ( !( ldap_utf8_mintab[*p & 0x1f] & p[1] ) )
+ i = 0;
+ }
+ return i;
+}
+
+/* conv UTF-8 to UCS-4, useful for comparisons */
+ldap_ucs4_t ldap_x_utf8_to_ucs4( const char * p )
+{
+ const unsigned char *c = (const unsigned char *) p;
+ ldap_ucs4_t ch;
+ int len, i;
+ static unsigned char mask[] = {
+ 0, 0x7f, 0x1f, 0x0f, 0x07, 0x03, 0x01 };
+
+ len = LDAP_UTF8_CHARLEN2(p, len);
+
+ if( len == 0 ) return LDAP_UCS4_INVALID;
+
+ ch = c[0] & mask[len];
+
+ for(i=1; i < len; i++) {
+ if ((c[i] & 0xc0) != 0x80) {
+ return LDAP_UCS4_INVALID;
+ }
+
+ ch <<= 6;
+ ch |= c[i] & 0x3f;
+ }
+
+ return ch;
+}
+
+/* conv UCS-4 to UTF-8, not used */
+int ldap_x_ucs4_to_utf8( ldap_ucs4_t c, char *buf )
+{
+ int len=0;
+ unsigned char* p = (unsigned char *) buf;
+
+ /* not a valid Unicode character */
+ if ( c < 0 ) return 0;
+
+ /* Just return length, don't convert */
+ if(buf == NULL) {
+ if( c < 0x80 ) return 1;
+ else if( c < 0x800 ) return 2;
+ else if( c < 0x10000 ) return 3;
+ else if( c < 0x200000 ) return 4;
+ else if( c < 0x4000000 ) return 5;
+ else return 6;
+ }
+
+ if( c < 0x80 ) {
+ p[len++] = c;
+
+ } else if( c < 0x800 ) {
+ p[len++] = 0xc0 | ( c >> 6 );
+ p[len++] = 0x80 | ( c & 0x3f );
+
+ } else if( c < 0x10000 ) {
+ p[len++] = 0xe0 | ( c >> 12 );
+ p[len++] = 0x80 | ( (c >> 6) & 0x3f );
+ p[len++] = 0x80 | ( c & 0x3f );
+
+ } else if( c < 0x200000 ) {
+ p[len++] = 0xf0 | ( c >> 18 );
+ p[len++] = 0x80 | ( (c >> 12) & 0x3f );
+ p[len++] = 0x80 | ( (c >> 6) & 0x3f );
+ p[len++] = 0x80 | ( c & 0x3f );
+
+ } else if( c < 0x4000000 ) {
+ p[len++] = 0xf8 | ( c >> 24 );
+ p[len++] = 0x80 | ( (c >> 18) & 0x3f );
+ p[len++] = 0x80 | ( (c >> 12) & 0x3f );
+ p[len++] = 0x80 | ( (c >> 6) & 0x3f );
+ p[len++] = 0x80 | ( c & 0x3f );
+
+ } else /* if( c < 0x80000000 ) */ {
+ p[len++] = 0xfc | ( c >> 30 );
+ p[len++] = 0x80 | ( (c >> 24) & 0x3f );
+ p[len++] = 0x80 | ( (c >> 18) & 0x3f );
+ p[len++] = 0x80 | ( (c >> 12) & 0x3f );
+ p[len++] = 0x80 | ( (c >> 6) & 0x3f );
+ p[len++] = 0x80 | ( c & 0x3f );
+ }
+
+ return len;
+}
+
+#define LDAP_UCS_UTF8LEN(c) \
+ c < 0 ? 0 : (c < 0x80 ? 1 : (c < 0x800 ? 2 : (c < 0x10000 ? 3 : \
+ (c < 0x200000 ? 4 : (c < 0x4000000 ? 5 : 6)))))
+
+/* Convert a string to UTF-8 format. The input string is expected to
+ * have characters of 1, 2, or 4 octets (in network byte order)
+ * corresponding to the ASN.1 T61STRING, BMPSTRING, and UNIVERSALSTRING
+ * types respectively. (Here T61STRING just means that there is one
+ * octet per character and characters may use the high bit of the octet.
+ * The characters are assumed to use ISO mappings, no provision is made
+ * for converting from T.61 coding rules to Unicode.)
+ */
+
+int
+ldap_ucs_to_utf8s( struct berval *ucs, int csize, struct berval *utf8s )
+{
+ unsigned char *in, *end;
+ char *ptr;
+ ldap_ucs4_t u;
+ int i, l = 0;
+
+ utf8s->bv_val = NULL;
+ utf8s->bv_len = 0;
+
+ in = (unsigned char *)ucs->bv_val;
+
+ /* Make sure we stop at an even multiple of csize */
+ end = in + ( ucs->bv_len & ~(csize-1) );
+
+ for (; in < end; ) {
+ u = *in++;
+ if (csize > 1) {
+ u <<= 8;
+ u |= *in++;
+ }
+ if (csize > 2) {
+ u <<= 8;
+ u |= *in++;
+ u <<= 8;
+ u |= *in++;
+ }
+ i = LDAP_UCS_UTF8LEN(u);
+ if (i == 0)
+ return LDAP_INVALID_SYNTAX;
+ l += i;
+ }
+
+ utf8s->bv_val = LDAP_MALLOC( l+1 );
+ if (utf8s->bv_val == NULL)
+ return LDAP_NO_MEMORY;
+ utf8s->bv_len = l;
+
+ ptr = utf8s->bv_val;
+ for (in = (unsigned char *)ucs->bv_val; in < end; ) {
+ u = *in++;
+ if (csize > 1) {
+ u <<= 8;
+ u |= *in++;
+ }
+ if (csize > 2) {
+ u <<= 8;
+ u |= *in++;
+ u <<= 8;
+ u |= *in++;
+ }
+ ptr += ldap_x_ucs4_to_utf8(u, ptr);
+ }
+ *ptr = '\0';
+ return LDAP_SUCCESS;
+}
+
+/*
+ * Advance to the next UTF-8 character
+ *
+ * Ignores length of multibyte character, instead rely on
+ * continuation markers to find start of next character.
+ * This allows for "resyncing" of when invalid characters
+ * are provided provided the start of the next character
+ * is appears within the 6 bytes examined.
+ */
+char* ldap_utf8_next( const char * p )
+{
+ int i;
+ const unsigned char *u = (const unsigned char *) p;
+
+ if( LDAP_UTF8_ISASCII(u) ) {
+ return (char *) &p[1];
+ }
+
+ for( i=1; i<6; i++ ) {
+ if ( ( u[i] & 0xc0 ) != 0x80 ) {
+ return (char *) &p[i];
+ }
+ }
+
+ return (char *) &p[i];
+}
+
+/*
+ * Advance to the previous UTF-8 character
+ *
+ * Ignores length of multibyte character, instead rely on
+ * continuation markers to find start of next character.
+ * This allows for "resyncing" of when invalid characters
+ * are provided provided the start of the next character
+ * is appears within the 6 bytes examined.
+ */
+char* ldap_utf8_prev( const char * p )
+{
+ int i;
+ const unsigned char *u = (const unsigned char *) p;
+
+ for( i=-1; i>-6 ; i-- ) {
+ if ( ( u[i] & 0xc0 ) != 0x80 ) {
+ return (char *) &p[i];
+ }
+ }
+
+ return (char *) &p[i];
+}
+
+/*
+ * Copy one UTF-8 character from src to dst returning
+ * number of bytes copied.
+ *
+ * Ignores length of multibyte character, instead rely on
+ * continuation markers to find start of next character.
+ * This allows for "resyncing" of when invalid characters
+ * are provided provided the start of the next character
+ * is appears within the 6 bytes examined.
+ */
+int ldap_utf8_copy( char* dst, const char *src )
+{
+ int i;
+ const unsigned char *u = (const unsigned char *) src;
+
+ dst[0] = src[0];
+
+ if( LDAP_UTF8_ISASCII(u) ) {
+ return 1;
+ }
+
+ for( i=1; i<6; i++ ) {
+ if ( ( u[i] & 0xc0 ) != 0x80 ) {
+ return i;
+ }
+ dst[i] = src[i];
+ }
+
+ return i;
+}
+
+#ifndef UTF8_ALPHA_CTYPE
+/*
+ * UTF-8 ctype routines
+ * Only deals with characters < 0x80 (ie: US-ASCII)
+ */
+
+int ldap_utf8_isascii( const char * p )
+{
+ unsigned c = * (const unsigned char *) p;
+ return LDAP_ASCII(c);
+}
+
+int ldap_utf8_isdigit( const char * p )
+{
+ unsigned c = * (const unsigned char *) p;
+
+ if(!LDAP_ASCII(c)) return 0;
+
+ return LDAP_DIGIT( c );
+}
+
+int ldap_utf8_isxdigit( const char * p )
+{
+ unsigned c = * (const unsigned char *) p;
+
+ if(!LDAP_ASCII(c)) return 0;
+
+ return LDAP_HEX(c);
+}
+
+int ldap_utf8_isspace( const char * p )
+{
+ unsigned c = * (const unsigned char *) p;
+
+ if(!LDAP_ASCII(c)) return 0;
+
+ switch(c) {
+ case ' ':
+ case '\t':
+ case '\n':
+ case '\r':
+ case '\v':
+ case '\f':
+ return 1;
+ }
+
+ return 0;
+}
+
+/*
+ * These are not needed by the C SDK and are
+ * not "good enough" for general use.
+ */
+int ldap_utf8_isalpha( const char * p )
+{
+ unsigned c = * (const unsigned char *) p;
+
+ if(!LDAP_ASCII(c)) return 0;
+
+ return LDAP_ALPHA(c);
+}
+
+int ldap_utf8_isalnum( const char * p )
+{
+ unsigned c = * (const unsigned char *) p;
+
+ if(!LDAP_ASCII(c)) return 0;
+
+ return LDAP_ALNUM(c);
+}
+
+int ldap_utf8_islower( const char * p )
+{
+ unsigned c = * (const unsigned char *) p;
+
+ if(!LDAP_ASCII(c)) return 0;
+
+ return LDAP_LOWER(c);
+}
+
+int ldap_utf8_isupper( const char * p )
+{
+ unsigned c = * (const unsigned char *) p;
+
+ if(!LDAP_ASCII(c)) return 0;
+
+ return LDAP_UPPER(c);
+}
+#endif
+
+
+/*
+ * UTF-8 string routines
+ */
+
+/* like strchr() */
+char * (ldap_utf8_strchr)( const char *str, const char *chr )
+{
+ for( ; *str != '\0'; LDAP_UTF8_INCR(str) ) {
+ if( ldap_x_utf8_to_ucs4( str ) == ldap_x_utf8_to_ucs4( chr ) ) {
+ return (char *) str;
+ }
+ }
+
+ return NULL;
+}
+
+/* like strcspn() but returns number of bytes, not characters */
+ber_len_t (ldap_utf8_strcspn)( const char *str, const char *set )
+{
+ const char *cstr;
+ const char *cset;
+
+ for( cstr = str; *cstr != '\0'; LDAP_UTF8_INCR(cstr) ) {
+ for( cset = set; *cset != '\0'; LDAP_UTF8_INCR(cset) ) {
+ if( ldap_x_utf8_to_ucs4( cstr ) == ldap_x_utf8_to_ucs4( cset ) ) {
+ return cstr - str;
+ }
+ }
+ }
+
+ return cstr - str;
+}
+
+/* like strspn() but returns number of bytes, not characters */
+ber_len_t (ldap_utf8_strspn)( const char *str, const char *set )
+{
+ const char *cstr;
+ const char *cset;
+
+ for( cstr = str; *cstr != '\0'; LDAP_UTF8_INCR(cstr) ) {
+ for( cset = set; ; LDAP_UTF8_INCR(cset) ) {
+ if( *cset == '\0' ) {
+ return cstr - str;
+ }
+
+ 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;
+}
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