runtime/dex/standard_dex_file.h

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * 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.
 */

#ifndef ART_RUNTIME_DEX_STANDARD_DEX_FILE_H_
#define ART_RUNTIME_DEX_STANDARD_DEX_FILE_H_

#include <iosfwd>

#include "dex_file.h"

namespace art {

class OatDexFile;

// Standard dex file. This is the format that is packaged in APKs and produced by tools.
class StandardDexFile : public DexFile {
 public:
  class Header : public DexFile::Header {
    // Same for now.
  };

  struct CodeItem : public DexFile::CodeItem {
   private:
    // TODO: Insert standard dex specific fields here.
    friend class StandardDexFile;
    DISALLOW_COPY_AND_ASSIGN(CodeItem);
  };

  // Write the standard dex specific magic.
  static void WriteMagic(uint8_t* magic);

  // Write the current version, note that the input is the address of the magic.
  static void WriteCurrentVersion(uint8_t* magic);

  static const uint8_t kDexMagic[kDexMagicSize];
  static constexpr size_t kNumDexVersions = 4;
  static const uint8_t kDexMagicVersions[kNumDexVersions][kDexVersionLen];

  // Returns true if the byte string points to the magic value.
  static bool IsMagicValid(const uint8_t* magic);
  virtual bool IsMagicValid() const OVERRIDE;

  // Returns true if the byte string after the magic is the correct value.
  static bool IsVersionValid(const uint8_t* magic);
  virtual bool IsVersionValid() const OVERRIDE;

  virtual bool SupportsDefaultMethods() const OVERRIDE;

  uint32_t GetCodeItemSize(const DexFile::CodeItem& item) const OVERRIDE;

 private:
  StandardDexFile(const uint8_t* base,
                  size_t size,
                  const std::string& location,
                  uint32_t location_checksum,
                  const OatDexFile* oat_dex_file,
                  DexFileContainer* container)
      : DexFile(base,
                size,
                location,
                location_checksum,
                oat_dex_file,
                container,
                /*is_compact_dex*/ false) {}

  friend class DexFileLoader;
  friend class DexFileVerifierTest;

  ART_FRIEND_TEST(ClassLinkerTest, RegisterDexFileName);  // for constructor

  DISALLOW_COPY_AND_ASSIGN(StandardDexFile);
};

}  // namespace art

#endif  // ART_RUNTIME_DEX_STANDARD_DEX_FILE_H_