#include <stdint.h>
#include <stdlib.h>
#include <gc.h>
#include "wc.h"
#include "wtf.h"

static void *die_oom(size_t bytes) {
    fprintf(stderr, "Out of memory: %lu bytes unavailable!\n", (unsigned long)bytes);
    exit(1);
}

int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size){
    static int init_done = 0;

    if (!init_done) {
	setenv("GC_LARGE_ALLOC_WARN_INTERVAL", "30000", 1);
	GC_INIT();
#if (GC_VERSION_MAJOR>7) || ((GC_VERSION_MAJOR==7) && (GC_VERSION_MINOR>=2))
	GC_set_oom_fn(die_oom);
#else
	GC_oom_fn = die_oom;
#endif
#ifdef USE_M17N
#ifdef USE_UNICODE
	wtf_init(WC_CES_UTF_8, WC_CES_UTF_8);
#else
	wtf_init(WC_CES_EUC_JP, WC_CES_EUC_JP);
#endif
#endif
	init_done = 1;
    }

    /* Assume the data format is:
     *   <str1> \0 <str2> \0 <str3>
     */
    const uint8_t *str1, *str2, *str3;
    const uint8_t *p;
    str1 = data;
    p = memchr(str1, '\0', size);
    if (p == NULL) return 0;
    str2 = p + 1;
    if (str2 >= data + size) return 0;
    p = memchr(str2, '\0', data + size - str2);
    if (p == NULL) return 0;
    str3 = p + 1;

    wc_ces old, from, to;
    from = wc_guess_charset_short((char*)str1, 0);
    to = wc_guess_charset_short((char*)str2, 0);

    Str s = Strnew_charp_n((char*)str3, data + size - str3);
    wc_Str_conv_with_detect(s, &from, from, to);
    Strfree(s);

    return 0;
}