1 files changed, 562 insertions, 0 deletions
diff --git a/libraries/libldap/utf-8.c b/libraries/libldap/utf-8.c
new file mode 100644
index 0000000..7a3431a
--- /dev/null
+++ b/libraries/libldap/utf-8.c
@@ -0,0 +1,562 @@
+/* utf-8.c -- Basic UTF-8 routines */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2021 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;
+}