From 8c61bd279ee31c9cd9c8df00e9ab7e24618cda6d Mon Sep 17 00:00:00 2001
From: Stig Venaas <venaas@openldap.org>
Date: Fri, 19 Jan 2001 15:52:58 +0000
Subject: [PATCH] Added UTF8normalize() that does Unicode canonical
 normalization and optionally case folding

---
 include/ldap_pvt_uc.h         |   4 ++
 libraries/liblunicode/ucstr.c | 130 ++++++++++++++++++++++++++++++++++
 2 files changed, 134 insertions(+)

diff --git a/include/ldap_pvt_uc.h b/include/ldap_pvt_uc.h
index bfd236ef05..6b8264a86f 100644
--- a/include/ldap_pvt_uc.h
+++ b/include/ldap_pvt_uc.h
@@ -126,6 +126,10 @@ LDAP_LUNICODE_F(void) ucstr2upper(
 	ldap_unicode_t *,
 	ber_len_t );
 
+LDAP_LUNICODE_F(char *) UTF8normalize(
+	const char *,
+	char casefold );
+
 LDAP_END_DECL
 
 #endif
diff --git a/libraries/liblunicode/ucstr.c b/libraries/liblunicode/ucstr.c
index 44276cb574..8eced84380 100644
--- a/libraries/liblunicode/ucstr.c
+++ b/libraries/liblunicode/ucstr.c
@@ -75,4 +75,134 @@ void ucstr2upper(
 	}
 }
 
+char * UTF8normalize(
+	const char *s,
+	char casefold )
+{
+	int i, j, len, clen, outpos, ucsoutlen, outsize, last;
+	char *out;
+	unsigned long *ucs, *p, *ucsout;
+
+	static unsigned char mask[] = {
+                0, 0x7f, 0x1f, 0x0f, 0x07, 0x03, 0x01 };
+
+	if ( s == NULL ) {
+		return NULL;
+	}
+	
+	len = strlen( s );
+
+	if ( len == 0 ) {
+		out = (char *) malloc( 1 );
+		*out = '\0';
+		return out;
+	}
+	
+	outsize = len + 7;
+	out = (char *) malloc( outsize );
+	if ( out == NULL ) {
+		return NULL;
+	}
+
+	outpos = 0;
+
+	/* finish off everything up to character before first non-ascii */
+	if ( LDAP_UTF8_ISASCII( s ) ) {
+		for ( i = 1; (i < len) && LDAP_UTF8_ISASCII(s + i); i++ ) {
+			out[outpos++] = casefold ? TOUPPER( s[i-1] ) : s[i-1];
+		}
+		if ( i == len ) {
+			out[outpos++] = casefold ? TOUPPER( s[len - 1] ) : s[len - 1];
+			out[outpos] = '\0';
+			return out;
+		}
+	} else {
+		i = 0;
+	}
 
+	p = ucs = (long *) malloc( len * sizeof(*ucs) );
+	if ( ucs == NULL ) {
+		free(out);
+		return NULL;
+	}
+
+	/* convert character before first non-ascii to ucs-4 */
+	if ( i > 0 ) {
+		*p = casefold ? TOUPPER( s[i - 1] ) : s[i - 1];
+		p++;
+	}
+
+	/* s[i] is now first non-ascii character */
+	for (;;) {
+		/* s[i] is non-ascii */
+		/* convert everything up to next ascii to ucs-4 */
+		while ( i < len ) {
+			clen = LDAP_UTF8_CHARLEN( s + i );
+			if ( clen == 0 ) {
+				free( ucs );
+				free( out );
+				return NULL;
+			}
+			if ( clen == 1 ) {
+				/* ascii */
+				break;
+			}
+			*p = s[i] & mask[clen];
+			i++;
+			for( j = 1; j < clen; j++ ) {
+				if ( (s[i] & 0xc0) != 0x80 ) {
+					free( ucs );
+					free( out );
+					return NULL;
+				}
+				*p <<= 6;
+				*p |= s[i] & 0x3f;
+				i++;
+			}
+			if ( casefold ) {
+				*p = uctoupper( *p );
+			}
+			p++;
+                }
+		/* normalize ucs of length p - ucs */
+		uccanondecomp( ucs, p - ucs, &ucsout, &ucsoutlen );    
+		ucsoutlen = uccanoncomp( ucsout, ucsoutlen );
+		/* convert ucs to utf-8 and store in out */
+		for ( j = 0; j < ucsoutlen; j++ ) {
+			/* allocate more space if not enough room for
+			   6 bytes and terminator */
+			if ( outsize - outpos < 7 ) {
+				outsize = ucsoutlen - j + outpos + 6;
+				out = (char *) realloc( out, outsize );
+				if ( out == NULL ) {
+					free( ucs );
+					return NULL;
+				}
+			}
+			outpos += ldap_ucs4_to_utf8( ucsout[j], &out[outpos] );
+		}
+		
+		if ( i == len ) {
+			break;
+		}
+
+		last = i;
+
+		/* s[i] is ascii */
+		/* finish off everything up to char before next non-ascii */
+		for ( i++; (i < len) && LDAP_UTF8_ISASCII(s + i); i++ ) {
+			out[outpos++] = casefold ? TOUPPER( s[i-1] ) : s[i-1];
+		}
+		if ( i == len ) {
+			out[outpos++] = casefold ? TOUPPER( s[len - 1] ) : s[len - 1];
+			break;
+		}
+
+		/* convert character before next non-ascii to ucs-4 */
+		*ucs = casefold ? TOUPPER( s[i - 1] ) : s[i - 1];
+		p = ucs + 1;
+	}		
+	free( ucs );
+	out[outpos] = '\0';
+	return out;
+}
-- 
2.39.5