1 files changed, 533 insertions, 0 deletions
diff --git a/src/util/support/utf8.c b/src/util/support/utf8.c
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+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* util/support/utf8.c */
+/*
+ * Copyright 2008 by the Massachusetts Institute of Technology.
+ * All Rights Reserved.
+ *
+ * Export of this software from the United States of America may
+ *   require a specific license from the United States Government.
+ *   It is the responsibility of any person or organization contemplating
+ *   export to obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ */
+/*
+ * Copyright 1998-2008 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>.
+ */
+
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>. */
+
+/* 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 KRB5 Client SDK.
+ *
+ * These routines are not optimized.
+ */
+
+#include "k5-platform.h"
+#include "k5-utf8.h"
+#include "supp-int.h"
+
+/*
+ * return the number of bytes required to hold the
+ * NULL-terminated UTF-8 string NOT INCLUDING the
+ * termination.
+ */
+size_t krb5int_utf8_bytes(const char *p)
+{
+    size_t bytes;
+
+    for (bytes = 0; p[bytes]; bytes++)
+        ;
+
+    return bytes;
+}
+
+size_t krb5int_utf8_chars(const char *p)
+{
+    /* could be optimized and could check for invalid sequences */
+    size_t chars = 0;
+
+    for ( ; *p ; KRB5_UTF8_INCR(p))
+        chars++;
+
+    return chars;
+}
+
+size_t krb5int_utf8c_chars(const char *p, size_t length)
+{
+    /* could be optimized and could check for invalid sequences */
+    size_t chars = 0;
+    const char *end = p + length;
+
+    for ( ; p < end; KRB5_UTF8_INCR(p))
+        chars++;
+
+    return chars;
+}
+
+/* return offset to next character */
+int krb5int_utf8_offset(const char *p)
+{
+    return KRB5_UTF8_NEXT(p) - p;
+}
+
+/*
+ * Returns length indicated by first byte.
+ */
+const char krb5int_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, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+
+int krb5int_utf8_charlen(const char *p)
+{
+    if (!(*p & 0x80))
+        return 1;
+
+    return krb5int_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 3629 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 0000-0010 FFFF   11110+++ 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 krb5int_utf8_lentab[] above.
+ */
+
+/* mask of required bits in second octet */
+#undef c
+#define c const char
+c krb5int_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)0x00, (c)0x00, (c)0x00,
+    (c)0x00, (c)0x00, (c)0x00, (c)0x00, (c)0x00, (c)0x00, (c)0x00, (c)0x00 };
+#undef c
+
+int krb5int_utf8_charlen2(const char *p)
+{
+    int i = KRB5_UTF8_CHARLEN(p);
+
+    if (i > 2) {
+        if (!(krb5int_utf8_mintab[*p & 0x1f] & p[1]))
+            i = 0;
+    }
+
+    return i;
+}
+
+/*
+ * Convert a UTF8 character to a UCS4 character.  Return 0 on success,
+ * -1 on failure.
+ */
+int krb5int_utf8_to_ucs4(const char *p, krb5_ucs4 *out)
+{
+    const unsigned char *c = (const unsigned char *) p;
+    krb5_ucs4 ch;
+    int len, i;
+    static unsigned char mask[] = {
+        0, 0x7f, 0x1f, 0x0f, 0x07 };
+
+    *out = 0;
+    len = KRB5_UTF8_CHARLEN2(p, len);
+
+    if (len == 0)
+        return -1;
+
+    ch = c[0] & mask[len];
+
+    for (i = 1; i < len; i++) {
+        if ((c[i] & 0xc0) != 0x80)
+            return -1;
+
+        ch <<= 6;
+        ch |= c[i] & 0x3f;
+    }
+
+    if (ch > 0x10ffff)
+        return -1;
+
+    *out = ch;
+    return 0;
+}
+
+int krb5int_utf8_to_ucs2(const char *p, krb5_ucs2 *out)
+{
+    krb5_ucs4 ch;
+
+    *out = 0;
+    if (krb5int_utf8_to_ucs4(p, &ch) == -1 || ch > 0xFFFF)
+        return -1;
+    *out = (krb5_ucs2) ch;
+    return 0;
+}
+
+/* conv UCS-2 to UTF-8, not used */
+size_t krb5int_ucs4_to_utf8(krb5_ucs4 c, char *buf)
+{
+    size_t len = 0;
+    unsigned char *p = (unsigned char *) buf;
+
+    /* not a valid Unicode character */
+    if (c > 0x10ffff)
+        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 return 4;
+    }
+
+    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 < 0x110000) */ {
+        p[len++] = 0xf0 | ( c >> 18 );
+        p[len++] = 0x80 | ( (c >> 12) & 0x3f );
+        p[len++] = 0x80 | ( (c >> 6) & 0x3f );
+        p[len++] = 0x80 | ( c & 0x3f );
+    }
+
+    return len;
+}
+
+size_t krb5int_ucs2_to_utf8(krb5_ucs2 c, char *buf)
+{
+    return krb5int_ucs4_to_utf8((krb5_ucs4)c, buf);
+}
+
+/*
+ * 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 *krb5int_utf8_next(const char *p)
+{
+    int i;
+    const unsigned char *u = (const unsigned char *) p;
+
+    if (KRB5_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 *krb5int_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 krb5int_utf8_copy(char* dst, const char *src)
+{
+    int i;
+    const unsigned char *u = (const unsigned char *) src;
+
+    dst[0] = src[0];
+
+    if (KRB5_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 krb5int_utf8_isascii(const char * p)
+{
+    unsigned c = * (const unsigned char *) p;
+
+    return KRB5_ASCII(c);
+}
+
+int krb5int_utf8_isdigit(const char * p)
+{
+    unsigned c = * (const unsigned char *) p;
+
+    if (!KRB5_ASCII(c))
+        return 0;
+
+    return KRB5_DIGIT( c );
+}
+
+int krb5int_utf8_isxdigit(const char * p)
+{
+    unsigned c = * (const unsigned char *) p;
+
+    if (!KRB5_ASCII(c))
+        return 0;
+
+    return KRB5_HEX(c);
+}
+
+int krb5int_utf8_isspace(const char * p)
+{
+    unsigned c = * (const unsigned char *) p;
+
+    if (!KRB5_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 krb5int_utf8_isalpha(const char * p)
+{
+    unsigned c = * (const unsigned char *) p;
+
+    if (!KRB5_ASCII(c))
+        return 0;
+
+    return KRB5_ALPHA(c);
+}
+
+int krb5int_utf8_isalnum(const char * p)
+{
+    unsigned c = * (const unsigned char *) p;
+
+    if (!KRB5_ASCII(c))
+        return 0;
+
+    return KRB5_ALNUM(c);
+}
+
+#if 0
+int krb5int_utf8_islower(const char * p)
+{
+    unsigned c = * (const unsigned char *) p;
+
+    if (!KRB5_ASCII(c))
+        return 0;
+
+    return KRB5_LOWER(c);
+}
+
+int krb5int_utf8_isupper(const char * p)
+{
+    unsigned c = * (const unsigned char *) p;
+
+    if (!KRB5_ASCII(c))
+        return 0;
+
+    return KRB5_UPPER(c);
+}
+#endif
+#endif
+
+
+/*
+ * UTF-8 string routines
+ */
+
+/* like strchr() */
+char *krb5int_utf8_strchr(const char *str, const char *chr)
+{
+    krb5_ucs4 chs, ch;
+
+    if (krb5int_utf8_to_ucs4(chr, &ch) == -1)
+        return NULL;
+    for ( ; *str != '\0'; KRB5_UTF8_INCR(str)) {
+        if (krb5int_utf8_to_ucs4(str, &chs) == 0 && chs == ch)
+            return (char *)str;
+    }
+
+    return NULL;
+}
+
+/* like strcspn() but returns number of bytes, not characters */
+size_t krb5int_utf8_strcspn(const char *str, const char *set)
+{
+    const char *cstr, *cset;
+    krb5_ucs4 chstr, chset;
+
+    for (cstr = str; *cstr != '\0'; KRB5_UTF8_INCR(cstr)) {
+        for (cset = set; *cset != '\0'; KRB5_UTF8_INCR(cset)) {
+            if (krb5int_utf8_to_ucs4(cstr, &chstr) == 0
+                && krb5int_utf8_to_ucs4(cset, &chset) == 0 && chstr == chset)
+                return cstr - str;
+        }
+    }
+
+    return cstr - str;
+}
+
+/* like strspn() but returns number of bytes, not characters */
+size_t krb5int_utf8_strspn(const char *str, const char *set)
+{
+    const char *cstr, *cset;
+    krb5_ucs4 chstr, chset;
+
+    for (cstr = str; *cstr != '\0'; KRB5_UTF8_INCR(cstr)) {
+        for (cset = set; ; KRB5_UTF8_INCR(cset)) {
+            if (*cset == '\0')
+                return cstr - str;
+            if (krb5int_utf8_to_ucs4(cstr, &chstr) == 0
+                && krb5int_utf8_to_ucs4(cset, &chset) == 0 && chstr == chset)
+                break;
+        }
+    }
+
+    return cstr - str;
+}
+
+/* like strpbrk(), replaces strchr() as well */
+char *krb5int_utf8_strpbrk(const char *str, const char *set)
+{
+    const char *cset;
+    krb5_ucs4 chstr, chset;
+
+    for ( ; *str != '\0'; KRB5_UTF8_INCR(str)) {
+        for (cset = set; *cset != '\0'; KRB5_UTF8_INCR(cset)) {
+            if (krb5int_utf8_to_ucs4(str, &chstr) == 0
+                && krb5int_utf8_to_ucs4(cset, &chset) == 0 && chstr == chset)
+                return (char *)str;
+        }
+    }
+
+    return NULL;
+}
+
+/* like strtok_r(), not strtok() */
+char *krb5int_utf8_strtok(char *str, const char *sep, char **last)
+{
+    char *begin;
+    char *end;
+
+    if (last == NULL)
+        return NULL;
+
+    begin = str ? str : *last;
+
+    begin += krb5int_utf8_strspn(begin, sep);
+
+    if (*begin == '\0') {
+        *last = NULL;
+        return NULL;
+    }
+
+    end = &begin[krb5int_utf8_strcspn(begin, sep)];
+
+    if (*end != '\0') {
+        char *next = KRB5_UTF8_NEXT(end);
+        *end = '\0';
+        end = next;
+    }
+
+    *last = end;
+
+    return begin;
+}