tools/aapt2/io/StringStream.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 AAPT_IO_STRINGSTREAM_H
#define AAPT_IO_STRINGSTREAM_H

#include <memory>

#include "android-base/macros.h"
#include "androidfw/Streams.h"
#include "androidfw/StringPiece.h"

namespace aapt {
namespace io {

class StringInputStream : public android::KnownSizeInputStream {
 public:
  explicit StringInputStream(android::StringPiece str);

  bool Next(const void** data, size_t* size) override;

  void BackUp(size_t count) override;

  size_t ByteCount() const override;

  inline bool HadError() const override {
    return false;
  }

  inline std::string GetError() const override {
    return {};
  }

  size_t TotalSize() const override;

  bool ReadFullyAtOffset(void* data, size_t byte_count, off64_t offset) override;

 private:
  DISALLOW_COPY_AND_ASSIGN(StringInputStream);

  android::StringPiece str_;
  size_t offset_;
};

class StringOutputStream : public android::OutputStream {
 public:
  explicit StringOutputStream(std::string* str, size_t buffer_capacity = 4096u);

  ~StringOutputStream();

  bool Next(void** data, size_t* size) override;

  void BackUp(size_t count) override;

  void Flush();

  size_t ByteCount() const override;

  inline bool HadError() const override {
    return false;
  }

  inline std::string GetError() const override {
    return {};
  }

 private:
  DISALLOW_COPY_AND_ASSIGN(StringOutputStream);

  void FlushImpl();

  std::string* str_;
  size_t buffer_capacity_;
  size_t buffer_offset_;
  std::unique_ptr<char[]> buffer_;
};

}  // namespace io
}  // namespace aapt

#endif  // AAPT_IO_STRINGSTREAM_H