| /* 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[(unsigned char)apr_tolower(*s_next)]; |
| } |
| return NULL; |
| } |
| |
| APR_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[(unsigned char)s[i]] = pattern->length - i - 1; |
| } |
| } |
| else { |
| pattern->compare = match_boyer_moore_horspool_nocase; |
| for (i = 0; i < pattern->length - 1; i++) { |
| shift[(unsigned char)apr_tolower(s[i])] = pattern->length - i - 1; |
| } |
| } |
| pattern->context = shift; |
| |
| return pattern; |
| } |