// 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 "brpc/amf.h"

#include "butil/iobuf.h"

#define kMinInputLength 5

#define kMaxInputLength 4096

extern "C" int

LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)

{

    if (size < kMinInputLength || size > kMaxInputLength){

        return 0;

    }

    uint8_t mode = data[0] % 3;

    const uint8_t *payload = data + 1;

    size_t payload_size = size - 1;

    butil::IOBuf buf;

    buf.append(payload, payload_size);

    switch (mode) {

        case 0: {

            // Read AMF object

            butil::IOBufAsZeroCopyInputStream zc_stream(buf);

            brpc::AMFInputStream stream(&zc_stream);

            brpc::AMFObject obj;

            brpc::ReadAMFObject(&obj, &stream);

            break;

        }

        case 1: {

            // Read AMF string

            butil::IOBufAsZeroCopyInputStream zc_stream(buf);

            brpc::AMFInputStream stream(&zc_stream);

            std::string val;

            brpc::ReadAMFString(&val, &stream);

            break;

        }

        case 2: {

            // Read raw AMF fields by consuming the stream directly

            butil::IOBufAsZeroCopyInputStream zc_stream(buf);

            brpc::AMFInputStream stream(&zc_stream);

            uint8_t marker;

            while (stream.good() && stream.cut_u8(&marker) == 1) {

                // Try to identify marker type and read value

                if (marker == brpc::AMF_MARKER_NUMBER) {

                    uint64_t num;

                    stream.cut_u64(&num);

                } else if (marker == brpc::AMF_MARKER_BOOLEAN) {

                    uint8_t b;

                    stream.cut_u8(&b);

                } else if (marker == brpc::AMF_MARKER_STRING) {

                    uint16_t len;

                    if (stream.cut_u16(&len) == 2 && len < 1024) {

                        char tmp[1024];

                        stream.cutn(tmp, len);

                    }

                }

            }

            break;

        }

    }

    return 0;

}