/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 *    Copyright 2018 (c) Fraunhofer IOSB (Author: Julius Pfrommer)

 */

#include <open62541/types.h>

/* Decode a message, then encode, decode, encode.

 * The two encodings must be bit-equal. */

extern "C" int

LLVMFuzzerTestOneInput(uint8_t *data, size_t size) {

    UA_ByteString buf;

    buf.data = (UA_Byte*)data;

    buf.length = size;

    UA_Variant value;

    UA_Variant_init(&value);

    UA_StatusCode retval = UA_decodeJson(&buf, &value, &UA_TYPES[UA_TYPES_VARIANT], NULL);

    if(retval != UA_STATUSCODE_GOOD)

        return 0;

    /* This can fail for now. For example length limits are not always computed

     * 100% identical between encoding and decoding. */

    size_t jsonSize = UA_calcSizeJson(&value, &UA_TYPES[UA_TYPES_VARIANT], NULL);

    if(jsonSize == 0) {

        UA_Variant_clear(&value);

        return 0;

    }

    UA_ByteString buf2 = UA_BYTESTRING_NULL;

    retval = UA_ByteString_allocBuffer(&buf2, jsonSize);

    if(retval != UA_STATUSCODE_GOOD) {

        UA_Variant_clear(&value);

        return 0;

    }

    retval = UA_encodeJson(&value, &UA_TYPES[UA_TYPES_VARIANT], &buf2, NULL);

    UA_assert(retval == UA_STATUSCODE_GOOD);

    UA_Variant value2;

    UA_Variant_init(&value2);

    retval = UA_decodeJson(&buf2, &value2, &UA_TYPES[UA_TYPES_VARIANT], NULL);

    if(retval == UA_STATUSCODE_BADOUTOFMEMORY) {

        UA_Variant_clear(&value);

        UA_ByteString_clear(&buf2);

        return 0;

    }

    UA_assert(retval == UA_STATUSCODE_GOOD);

    UA_assert(UA_order(&value, &value2, &UA_TYPES[UA_TYPES_VARIANT]) == UA_ORDER_EQ);

    UA_ByteString buf3 = UA_BYTESTRING_NULL;

    retval = UA_ByteString_allocBuffer(&buf3, jsonSize);

    if(retval != UA_STATUSCODE_GOOD) {

        UA_Variant_clear(&value);

        UA_Variant_clear(&value2);

        UA_ByteString_clear(&buf2);

        return 0;

    }

    retval = UA_encodeJson(&value2, &UA_TYPES[UA_TYPES_VARIANT], &buf3, NULL);

    UA_assert(retval == UA_STATUSCODE_GOOD);

    UA_assert(buf2.length == buf3.length);

    UA_assert(memcmp(buf2.data, buf3.data, buf2.length) == 0);

    UA_Variant_clear(&value);

    UA_Variant_clear(&value2);

    UA_ByteString_clear(&buf2);

    UA_ByteString_clear(&buf3);

    return 0;

}