// Copyright 2022 Risc0, Inc.
//
// Licensed 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 "risc0/zkvm/sdk/cpp/guest/risc0.h"

using namespace risc0;

extern "C" void risc0_main(Env* env) {
  const uint8_t* src = static_cast<const uint8_t*>(env->read(1024));
  uint8_t* dest = const_cast<uint8_t*>(static_cast<const uint8_t*>(env->read(1024)));
  uint32_t srcOffset = env->read<uint32_t>();
  uint32_t destOffset = env->read<uint32_t>();
  uint32_t size = env->read<uint32_t>();
  if (srcOffset == 1024) {
    memset(dest + destOffset, 0xff, size);
  } else {
    memcpy(dest + destOffset, src + srcOffset, size);
  }
  env->write(dest, 1024);
}