// Copyright 2014 The Crashpad Authors. All rights reserved.
//
// 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 "minidump/minidump_string_writer.h"

#include "base/logging.h"
#include "minidump/minidump_writer_util.h"
#include "util/numeric/safe_assignment.h"

namespace crashpad {
namespace internal {

template <typename Traits>
MinidumpStringWriter<Traits>::MinidumpStringWriter()
    : MinidumpWritable(), string_base_(), string_() {
}

template <typename Traits>
MinidumpStringWriter<Traits>::~MinidumpStringWriter() {
}

template <typename Traits>
bool MinidumpStringWriter<Traits>::Freeze() {
  DCHECK_EQ(state(), kStateMutable);

  if (!MinidumpWritable::Freeze()) {
    return false;
  }

  size_t string_bytes = string_.size() * sizeof(string_[0]);
  if (!AssignIfInRange(&string_base_.Length, string_bytes)) {
    LOG(ERROR) << "string_bytes " << string_bytes << " out of range";
    return false;
  }

  return true;
}

template <typename Traits>
size_t MinidumpStringWriter<Traits>::SizeOfObject() {
  DCHECK_GE(state(), kStateFrozen);

  // Include the NUL terminator.
  return sizeof(string_base_) + (string_.size() + 1) * sizeof(string_[0]);
}

template <typename Traits>
bool MinidumpStringWriter<Traits>::WriteObject(
    FileWriterInterface* file_writer) {
  DCHECK_EQ(state(), kStateWritable);

  // The string’s length is stored in string_base_, and its data is stored in
  // string_. Write them both.
  WritableIoVec iov;
  iov.iov_base = &string_base_;
  iov.iov_len = sizeof(string_base_);
  std::vector<WritableIoVec> iovecs(1, iov);

  // Include the NUL terminator.
  iov.iov_base = &string_[0];
  iov.iov_len = (string_.size() + 1) * sizeof(string_[0]);
  iovecs.push_back(iov);

  return file_writer->WriteIoVec(&iovecs);
}

// Explicit template instantiation of the forms of MinidumpStringWriter<> used
// as base classes.
template class MinidumpStringWriter<MinidumpStringWriterUTF16Traits>;
template class MinidumpStringWriter<MinidumpStringWriterUTF8Traits>;

void MinidumpUTF16StringWriter::SetUTF8(const std::string& string_utf8) {
  DCHECK_EQ(state(), kStateMutable);

  set_string(MinidumpWriterUtil::ConvertUTF8ToUTF16(string_utf8));
}

}  // namespace internal
}  // namespace crashpad