From 54f7a9327dea1aa2ccf4365e574968b1b1568042 Mon Sep 17 00:00:00 2001
From: Joe Orton <jorton@apache.org>
Date: Tue, 24 Mar 2009 11:12:27 +0000
Subject: Merge strmatch, xlate, crypto and xml directories from apr-util.

git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@757729 13f79535-47bb-0310-9956-ffa450edef68
---
 strmatch/apr_strmatch.c | 118 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 strmatch/apr_strmatch.c

(limited to 'strmatch')

diff --git a/strmatch/apr_strmatch.c b/strmatch/apr_strmatch.c
new file mode 100644
index 000000000..7fec638c8
--- /dev/null
+++ b/strmatch/apr_strmatch.c
@@ -0,0 +1,118 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apr_strmatch.h"
+#include "apr_lib.h"
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+
+
+#define NUM_CHARS  256
+
+/*
+ * String searching functions
+ */
+static const char *match_no_op(const apr_strmatch_pattern *this_pattern,
+                               const char *s, apr_size_t slen)
+{
+    return s;
+}
+
+static const char *match_boyer_moore_horspool(
+                               const apr_strmatch_pattern *this_pattern,
+                               const char *s, apr_size_t slen)
+{
+    const char *s_end = s + slen;
+    apr_size_t *shift = (apr_size_t *)(this_pattern->context);
+    const char *s_next = s + this_pattern->length - 1;
+    const char *p_start = this_pattern->pattern;
+    const char *p_end = p_start + this_pattern->length - 1;
+    while (s_next < s_end) {
+        const char *s_tmp = s_next;
+        const char *p_tmp = p_end;
+        while (*s_tmp == *p_tmp) {
+            p_tmp--;
+            if (p_tmp < p_start) {
+                return s_tmp;
+            }
+            s_tmp--;
+        }
+        s_next += shift[(int)*((const unsigned char *)s_next)];
+    }
+    return NULL;
+}
+
+static const char *match_boyer_moore_horspool_nocase(
+                               const apr_strmatch_pattern *this_pattern,
+                               const char *s, apr_size_t slen)
+{
+    const char *s_end = s + slen;
+    apr_size_t *shift = (apr_size_t *)(this_pattern->context);
+    const char *s_next = s + this_pattern->length - 1;
+    const char *p_start = this_pattern->pattern;
+    const char *p_end = p_start + this_pattern->length - 1;
+    while (s_next < s_end) {
+        const char *s_tmp = s_next;
+        const char *p_tmp = p_end;
+        while (apr_tolower(*s_tmp) == apr_tolower(*p_tmp)) {
+            p_tmp--;
+            if (p_tmp < p_start) {
+                return s_tmp;
+            }
+            s_tmp--;
+        }
+        s_next += shift[apr_tolower(*s_next)];
+    }
+    return NULL;
+}
+
+APU_DECLARE(const apr_strmatch_pattern *) apr_strmatch_precompile(
+                                              apr_pool_t *p, const char *s,
+                                              int case_sensitive)
+{
+    apr_strmatch_pattern *pattern;
+    apr_size_t i;
+    apr_size_t *shift;
+
+    pattern = apr_palloc(p, sizeof(*pattern));
+    pattern->pattern = s;
+    pattern->length = strlen(s);
+    if (pattern->length == 0) {
+        pattern->compare = match_no_op;
+        pattern->context = NULL;
+        return pattern;
+    }
+
+    shift = (apr_size_t *)apr_palloc(p, sizeof(apr_size_t) * NUM_CHARS);
+    for (i = 0; i < NUM_CHARS; i++) {
+        shift[i] = pattern->length;
+    }
+    if (case_sensitive) {
+        pattern->compare = match_boyer_moore_horspool;
+        for (i = 0; i < pattern->length - 1; i++) {
+            shift[(int)s[i]] = pattern->length - i - 1;
+        }
+    }
+    else {
+        pattern->compare = match_boyer_moore_horspool_nocase;
+        for (i = 0; i < pattern->length - 1; i++) {
+            shift[apr_tolower(s[i])] = pattern->length - i - 1;
+        }
+    }
+    pattern->context = shift;
+
+    return pattern;
+}
-- 
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