// Copyright 2015 The Bazel 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.

#ifndef INCLUDED_THIRD_PARTY_IJAR_MAPPED_FILE_H
#define INCLUDED_THIRD_PARTY_IJAR_MAPPED_FILE_H

#include "third_party/ijar/common.h"

namespace devtools_ijar
{

struct MappedInputFileImpl;
struct MappedOutputFileImpl;

// A memory mapped input file.
class MappedInputFile
{
  private:
    MappedInputFileImpl *impl_;

  protected:
    const char *errmsg_;
    bool opened_;
    u1 *buffer_;
    size_t length_;

  public:
    MappedInputFile(const char *name);
    virtual ~MappedInputFile();

    // If opening the file succeeded or not.
    bool Opened() const { return opened_; }

    // Description of the last error that happened.
    const char *Error() const { return errmsg_; }

    // The mapped contents of the file.
    u1 *Buffer() const { return buffer_; }

    // The length of the file.
    size_t Length() const { return length_; }

    // Unmap a given number of bytes from the beginning of the file.
    void Discard(size_t bytes);
    int Close();
};

class MappedOutputFile
{
  private:
    MappedOutputFileImpl *impl_;

  protected:
    const char *errmsg_;
    bool opened_;
    u1 *buffer_;
    size_t estimated_size_;

  public:
    MappedOutputFile(const char *name, size_t estimated_size);
    virtual ~MappedOutputFile();

    // If opening the file succeeded or not.
    bool Opened() const { return opened_; }

    // Description of the last error that happened.
    const char *Error() const { return errmsg_; }

    // The mapped contents of the file.
    u1 *Buffer() const { return buffer_; }
    int Close(size_t size);
};

}  // namespace devtools_ijar
#endif
