typed_data_utils.cc

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// Copyright (c) 2018, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
 
#include "bin/typed_data_utils.h"
#include "platform/assert.h"
 
namespace dart {
namespace bin {
 
TypedDataScope::TypedDataScope(Dart_Handle data) : data_handle_(data) {
  Dart_Handle result;
  result = Dart_TypedDataAcquireData(data, &type_, &data_, &length_);
  if (Dart_IsError(result)) {
    Dart_PropagateError(result);
  }
}
 
void TypedDataScope::Release() {
  if (data_handle_ == nullptr) {
    return;
  }
  Dart_Handle result = Dart_TypedDataReleaseData(data_handle_);
  if (Dart_IsError(result)) {
    Dart_PropagateError(result);
  }
  data_handle_ = nullptr;
  data_ = nullptr;
  length_ = 0;
  type_ = Dart_TypedData_kInvalid;
}
 
intptr_t TypedDataScope::size_in_bytes() const {
  switch (type_) {
    case Dart_TypedData_kByteData:
    case Dart_TypedData_kInt8:
    case Dart_TypedData_kUint8:
    case Dart_TypedData_kUint8Clamped:
      return length_;
    case Dart_TypedData_kInt16:
    case Dart_TypedData_kUint16:
      return length_ * 2;
    case Dart_TypedData_kInt32:
    case Dart_TypedData_kUint32:
    case Dart_TypedData_kFloat32:
      return length_ * 4;
    case Dart_TypedData_kInt64:
    case Dart_TypedData_kUint64:
    case Dart_TypedData_kFloat64:
      return length_ * 8;
    case Dart_TypedData_kFloat32x4:
      return length_ * 16;
    default:
      UNREACHABLE();
  }
}
 
const char* TypedDataScope::GetScopedCString() const {
  char* buf = reinterpret_cast<char*>(Dart_ScopeAllocate(size_in_bytes() + 1));
  strncpy(buf, GetCString(), size_in_bytes());
  buf[size_in_bytes()] = '\0';
  return buf;
}
 
}  // namespace bin
}  // namespace dart