Adding upstream version 2.4.57+dfsg.upstream/2.4.57+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 472 insertions, 0 deletions

diff --git a/libraries/liblunicode/utbm/utbm.c b/libraries/liblunicode/utbm/utbm.c
new file mode 100644
index 0000000..ef24746
--- /dev/null
+++ b/libraries/liblunicode/utbm/utbm.c
@@ -0,0 +1,472 @@
+/* $OpenLDAP$ */
+/* 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 file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+/* Copyright 1997, 1998, 1999 Computing Research Labs,
+ * New Mexico State University
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COMPUTING RESEARCH LAB OR NEW MEXICO STATE UNIVERSITY BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
+ * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+/* $Id: utbm.c,v 1.1 1999/09/21 15:45:17 mleisher Exp $ */
+
+/*
+ * Assumptions:
+ * 1. Case conversions of UTF-16 characters must also be UTF-16 characters.
+ * 2. Case conversions are all one-to-one.
+ * 3. Text and pattern have already been normalized in some fashion.
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include "utbm.h"
+
+/*
+ * Single pattern character.
+ */
+typedef struct {
+    ucs4_t lc;
+    ucs4_t uc;
+    ucs4_t tc;
+} _utbm_char_t;
+
+typedef struct {
+    _utbm_char_t *ch;
+    unsigned long skip;
+} _utbm_skip_t;
+
+typedef struct _utbm_pattern_t {
+    unsigned long flags;
+
+    _utbm_char_t *pat;
+    unsigned long pat_used;
+    unsigned long pat_size;
+    unsigned long patlen;
+
+    _utbm_skip_t *skip;
+    unsigned long skip_used;
+    unsigned long skip_size;
+
+    unsigned long md4;
+} _utbm_pattern_t;
+
+/*************************************************************************
+ *
+ * Support functions.
+ *
+ *************************************************************************/
+
+/*
+ * Routine to look up the skip value for a character.
+ */
+static unsigned long
+_utbm_skip(utbm_pattern_t p, ucs2_t *start, ucs2_t *end)
+{
+    unsigned long i;
+    ucs4_t c1, c2;
+    _utbm_skip_t *sp;
+
+    if (start >= end)
+      return 0;
+
+    c1 = *start;
+    c2 = (start + 1 < end) ? *(start + 1) : ~0;
+    if (0xd800 <= c1 && c1 <= 0xdbff && 0xdc00 <= c2 && c2 <= 0xdfff)
+      c1 = 0x10000 + (((c1 & 0x03ff) << 10) | (c2 & 0x03ff));
+
+    for (i = 0, sp = p->skip; i < p->skip_used; i++, sp++) {
+        if (!((c1 ^ sp->ch->uc) & (c1 ^ sp->ch->lc) & (c1 ^ sp->ch->tc))) {
+            return ((unsigned long) (end - start) < sp->skip) ?
+                end - start : sp->skip;
+        }
+    }
+    return p->patlen;
+}
+
+static int
+_utbm_match(utbm_pattern_t pat, ucs2_t *text, ucs2_t *start, ucs2_t *end,
+            unsigned long *match_start, unsigned long *match_end)
+{
+    int check_space;
+    ucs4_t c1, c2;
+    unsigned long count;
+    _utbm_char_t *cp;
+
+    /*
+     * Set the potential match endpoint first.
+     */
+    *match_end = (start - text) + 1;
+
+    c1 = *start;
+    c2 = (start + 1 < end) ? *(start + 1) : ~0;
+    if (0xd800 <= c1 && c1 <= 0xdbff && 0xdc00 <= c2 && c2 <= 0xdfff) {
+        c1 = 0x10000 + (((c1 & 0x03ff) << 10) | (c2 & 0x03ff));
+        /*
+         * Adjust the match end point to occur after the UTF-16 character.
+         */
+        *match_end = *match_end + 1;
+    }
+
+    if (pat->pat_used == 1) {
+        *match_start = start - text;
+        return 1;
+    }
+
+    /*
+     * Compare backward.
+     */
+    cp = pat->pat + (pat->pat_used - 1);
+
+    for (count = pat->patlen; start > text && count > 0;) {
+        /*
+         * Ignore non-spacing characters if indicated.
+         */
+        if (pat->flags & UTBM_IGNORE_NONSPACING) {
+            while (start > text && _utbm_nonspacing(c1)) {
+                c2 = *--start;
+                c1 = (start - 1 > text) ? *(start - 1) : ~0;
+                if (0xdc00 <= c2 && c2 <= 0xdfff &&
+                    0xd800 <= c1 && c1 <= 0xdbff) {
+                    c1 = 0x10000 + (((c1 & 0x03ff) << 10) | (c2 & 0x03ff));
+                    start--;
+                } else
+                  c1 = c2;
+            }
+        }
+
+        /*
+         * Handle space compression if indicated.
+         */
+        if (pat->flags & UTBM_SPACE_COMPRESS) {
+            check_space = 0;
+            while (start > text &&
+                   (_utbm_isspace(c1, 1) || _utbm_iscntrl(c1))) {
+                check_space = _utbm_isspace(c1, 1);
+                c2 = *--start;
+                c1 = (start - 1 > text) ? *(start - 1) : ~0;
+                if (0xdc00 <= c2 && c2 <= 0xdfff &&
+                    0xd800 <= c1 && c1 <= 0xdbff) {
+                    c1 = 0x10000 + (((c1 & 0x03ff) << 10) | (c2 & 0x03ff));
+                    start--;
+                } else
+                  c1 = c2;
+            }
+            /*
+             * Handle things if space compression was indicated and one or
+             * more member characters were found.
+             */
+            if (check_space) {
+                if (cp->uc != ' ')
+                  return 0;
+                cp--;
+                count--;
+            }
+        }
+
+        /*
+         * Handle the normal comparison cases.
+         */
+        if (count > 0 && ((c1 ^ cp->uc) & (c1 ^ cp->lc) & (c1 ^ cp->tc)))
+          return 0;
+
+        count -= (c1 >= 0x10000) ? 2 : 1;
+        if (count > 0) {
+            cp--;
+
+            /*
+             * Get the next preceding character.
+             */
+            if (start > text) {
+                c2 = *--start;
+                c1 = (start - 1 > text) ? *(start - 1) : ~0;
+                if (0xdc00 <= c2 && c2 <= 0xdfff &&
+                    0xd800 <= c1 && c1 <= 0xdbff) {
+                    c1 = 0x10000 + (((c1 & 0x03ff) << 10) | (c2 & 0x03ff));
+                    start--;
+                } else
+                  c1 = c2;
+            }
+        }
+    }
+
+    /*
+     * Set the match start position.
+     */
+    *match_start = start - text;
+    return 1;
+}
+
+/*************************************************************************
+ *
+ * API.
+ *
+ *************************************************************************/
+
+utbm_pattern_t
+utbm_create_pattern(void)
+{
+    utbm_pattern_t p;
+
+    p = (utbm_pattern_t) malloc(sizeof(_utbm_pattern_t));
+    (void) memset((char *) p, '\0', sizeof(_utbm_pattern_t));
+    return p;
+}
+
+void
+utbm_free_pattern(utbm_pattern_t pattern)
+{
+    if (pattern == 0)
+      return;
+
+    if (pattern->pat_size > 0)
+      free((char *) pattern->pat);
+
+    if (pattern->skip_size > 0)
+      free((char *) pattern->skip);
+
+    free((char *) pattern);
+}
+
+void
+utbm_compile(ucs2_t *pat, unsigned long patlen, unsigned long flags,
+             utbm_pattern_t p)
+{
+    int have_space;
+    unsigned long i, j, k, slen;
+    _utbm_char_t *cp;
+    _utbm_skip_t *sp;
+    ucs4_t c1, c2, sentinel;
+
+    if (p == 0 || pat == 0 || *pat == 0 || patlen == 0)
+      return;
+
+    /*
+     * Reset the pattern buffer.
+     */
+    p->patlen = p->pat_used = p->skip_used = 0;
+
+    /*
+     * Set the flags.
+     */
+    p->flags = flags;
+
+    /*
+     * Initialize the extra skip flag.
+     */
+    p->md4 = 1;
+
+    /*
+     * Allocate more storage if necessary.
+     */
+    if (patlen > p->pat_size) {
+        if (p->pat_size == 0) {
+            p->pat = (_utbm_char_t *) malloc(sizeof(_utbm_char_t) * patlen);
+            p->skip = (_utbm_skip_t *) malloc(sizeof(_utbm_skip_t) * patlen);
+        } else {
+            p->pat = (_utbm_char_t *)
+                realloc((char *) p->pat, sizeof(_utbm_char_t) * patlen);
+            p->skip = (_utbm_skip_t *)
+                realloc((char *) p->skip, sizeof(_utbm_skip_t) * patlen);
+        }
+        p->pat_size = p->skip_size = patlen;
+    }
+
+    /*
+     * Preprocess the pattern to remove controls (if specified) and determine
+     * case.
+     */
+    for (have_space = 0, cp = p->pat, i = 0; i < patlen; i++) {
+        c1 = pat[i];
+        c2 = (i + 1 < patlen) ? pat[i + 1] : ~0;
+        if (0xd800 <= c1 && c1 <= 0xdbff && 0xdc00 <= c2 && c2 <= 0xdfff)
+          c1 = 0x10000 + (((c1 & 0x03ff) << 10) | (c2 & 0x03ff));
+
+        /*
+         * Make sure the `have_space' flag is turned off if the character
+         * is not an appropriate one.
+         */
+        if (!_utbm_isspace(c1, flags & UTBM_SPACE_COMPRESS))
+          have_space = 0;
+
+        /*
+         * If non-spacing characters should be ignored, do it here.
+         */
+        if ((flags & UTBM_IGNORE_NONSPACING) && _utbm_nonspacing(c1))
+          continue;
+
+        /*
+         * Check if spaces and controls need to be compressed.
+         */
+        if (flags & UTBM_SPACE_COMPRESS) {
+            if (_utbm_isspace(c1, 1)) {
+                if (!have_space) {
+                    /*
+                     * Add a space and set the flag.
+                     */
+                    cp->uc = cp->lc = cp->tc = ' ';
+                    cp++;
+
+                    /*
+                     * Increase the real pattern length.
+                     */
+                    p->patlen++;
+                    sentinel = ' ';
+                    have_space = 1;
+                }
+                continue;
+            }
+
+            /*
+             * Ignore all control characters.
+             */
+            if (_utbm_iscntrl(c1))
+              continue;
+        }
+
+        /*
+         * Add the character.
+         */
+        if (flags & UTBM_CASEFOLD) {
+            cp->uc = _utbm_toupper(c1);
+            cp->lc = _utbm_tolower(c1);
+            cp->tc = _utbm_totitle(c1);
+        } else
+          cp->uc = cp->lc = cp->tc = c1;
+
+        /*
+         * Set the sentinel character.
+         */
+        sentinel = cp->uc;
+
+        /*
+         * Move to the next character.
+         */
+        cp++;
+
+        /*
+         * Increase the real pattern length appropriately.
+         */
+        p->patlen += (c1 >= 0x10000) ? 2 : 1;
+
+        /*
+         * Increment the loop index for UTF-16 characters.
+         */
+        i += (c1 >= 0x10000) ? 1 : 0;
+
+    }
+
+    /*
+     * Set the number of characters actually used.
+     */
+    p->pat_used = cp - p->pat;
+
+    /*
+     * Go through and construct the skip array and determine the actual length
+     * of the pattern in UCS2 terms.
+     */
+    slen = p->patlen - 1;
+    cp = p->pat;
+    for (i = k = 0; i < p->pat_used; i++, cp++) {
+        /*
+         * Locate the character in the skip array.
+         */
+        for (sp = p->skip, j = 0;
+             j < p->skip_used && sp->ch->uc != cp->uc; j++, sp++) ;
+
+        /*
+         * If the character is not found, set the new skip element and
+         * increase the number of skip elements.
+         */
+        if (j == p->skip_used) {
+            sp->ch = cp;
+            p->skip_used++;
+        }
+
+        /*
+         * Set the updated skip value.  If the character is UTF-16 and is
+         * not the last one in the pattern, add one to its skip value.
+         */
+        sp->skip = slen - k;
+        if (cp->uc >= 0x10000 && k + 2 < slen)
+          sp->skip++;
+
+        /*
+         * Set the new extra skip for the sentinel character.
+         */
+        if (((cp->uc >= 0x10000 && k + 2 <= slen) || k + 1 <= slen) &&
+            cp->uc == sentinel)
+          p->md4 = slen - k;
+
+        /*
+         * Increase the actual index.
+         */
+        k += (cp->uc >= 0x10000) ? 2 : 1;
+    }
+}
+
+int
+utbm_exec(utbm_pattern_t pat, ucs2_t *text, unsigned long textlen,
+          unsigned long *match_start, unsigned long *match_end)
+{
+    unsigned long k;
+    ucs2_t *start, *end;
+
+    if (pat == 0 || pat->pat_used == 0 || text == 0 || textlen == 0 ||
+        textlen < pat->patlen)
+      return 0;
+
+    start = text + pat->patlen;
+    end = text + textlen;
+
+    /*
+     * Adjust the start point if it points to a low surrogate.
+     */
+    if (0xdc00 <= *start && *start <= 0xdfff &&
+        0xd800 <= *(start - 1) && *(start - 1) <= 0xdbff)
+      start--;
+
+    while (start < end) {
+        while ((k = _utbm_skip(pat, start, end))) {
+            start += k;
+            if (start < end && 0xdc00 <= *start && *start <= 0xdfff &&
+                0xd800 <= *(start - 1) && *(start - 1) <= 0xdbff)
+              start--;
+        }
+
+        if (start < end &&
+            _utbm_match(pat, text, start, end, match_start, match_end))
+          return 1;
+
+        start += pat->md4;
+        if (start < end && 0xdc00 <= *start && *start <= 0xdfff &&
+            0xd800 <= *(start - 1) && *(start - 1) <= 0xdbff)
+          start--;
+    }
+    return 0;
+}