内容过滤中关键字的匹配函数

/* Add a search pattern to a search object, and associate pattern data to it */ int         qsearch_add_pattern(qsearch_obj_t * self, unsigned char *pattern, int len,             void *ptrn_data, int type) {                    if ((1 << type) & self->statics->supported_types)         return (*self->statics->add_pattern) (self, pattern, len,                               ptrn_data, type);     return -QEBADTYPE; }