#include <stdlib.h>

#include <string.h>

#include "filter.h"

struct FString

{

    struct FFilter base;

    unsigned char *p;

    int len;

};

static void fstring_reset(struct FFilter *ff)

{

    ff->matched = 0;

}

static int fstring_function(struct FFilter *ff, unsigned char c)

{

    struct FString *fs = (struct FString *) ff;

    if (fs->p[fs->base.matched] == c)

        fs->base.matched++;

    else

    {

        /* A SAC */

        if (fs->p[0] == c)

            fs->base.matched = 1;

        else

            fs->base.matched = 0;

    }

    if (fs->base.matched == fs->len)

        return 1;

    return 0;

}

struct FFilter *new_fstring(char *p)

{

    struct FString *fs;

    fs = (struct FString *) malloc(sizeof(*fs));

    fs->p = strdup(p);

    fs->len = strlen(p);

    fs->base.matched = 0;

    fs->base.function = fstring_function;

    fs->base.reset = fstring_reset;

    fs->base.callback = 0;

    return (struct FFilter *) fs;

}

struct FFilter *new_fstring_len(char *p, int len)

{

    struct FString *fs;

    fs = (struct FString *) malloc(sizeof(*fs));

    fs->p = strdup(p);

    fs->len = len;

    fs->base.matched = 0;

    fs->base.function = fstring_function;

    fs->base.reset = fstring_reset;

    fs->base.callback = 0;

    return (struct FFilter *) fs;

}