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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_ZLIB_GOOGLE_ZIP_WRITER_H_
#define THIRD_PARTY_ZLIB_GOOGLE_ZIP_WRITER_H_
#include <memory>
#include <vector>
#include "base/files/file_path.h"
#include "build/build_config.h"
#include "third_party/zlib/google/zip.h"
#if defined(USE_SYSTEM_MINIZIP)
#include <minizip/unzip.h>
#include <minizip/zip.h>
#else
#include "third_party/zlib/contrib/minizip/unzip.h"
#include "third_party/zlib/contrib/minizip/zip.h"
#endif
namespace zip {
namespace internal {
// A class used to write entries to a ZIP file and buffering the reading of
// files to limit the number of calls to the FileAccessor. This is for
// performance reasons as these calls may be expensive when IPC based).
// This class is so far internal and only used by zip.cc, but could be made
// public if needed.
class ZipWriter {
public:
// Creates a writer that will write a ZIP file to |zip_file_fd|/|zip_file|
// and which entries (specifies with AddEntries) are relative to |root_dir|.
// All file reads are performed using |file_accessor|.
#if defined(OS_POSIX)
static std::unique_ptr<ZipWriter> CreateWithFd(int zip_file_fd,
const base::FilePath& root_dir,
FileAccessor* file_accessor);
#endif
static std::unique_ptr<ZipWriter> Create(const base::FilePath& zip_file,
const base::FilePath& root_dir,
FileAccessor* file_accessor);
~ZipWriter();
// Writes the files at |paths| to the ZIP file and closes this Zip file.
// Note that the the FilePaths must be relative to |root_dir| specified in the
// Create method.
// Returns true if all entries were written successfuly.
bool WriteEntries(const std::vector<base::FilePath>& paths);
private:
ZipWriter(zipFile zip_file,
const base::FilePath& root_dir,
FileAccessor* file_accessor);
// Writes the pending entries to the ZIP file if there are at least
// |kMaxPendingEntriesCount| of them. If |force| is true, all pending entries
// are written regardless of how many there are.
// Returns false if writing an entry fails, true if no entry was written or
// there was no error writing entries.
bool FlushEntriesIfNeeded(bool force);
// Adds the files at |paths| to the ZIP file. These FilePaths must be relative
// to |root_dir| specified in the Create method.
bool AddEntries(const std::vector<base::FilePath>& paths);
// Closes the ZIP file.
// Returns true if successful, false otherwise (typically if an entry failed
// to be written).
bool Close();
// The entries that have been added but not yet written to the ZIP file.
std::vector<base::FilePath> pending_entries_;
// The actual zip file.
zipFile zip_file_;
// Path to the directory entry paths are relative to.
base::FilePath root_dir_;
// Abstraction over file access methods used to read files.
FileAccessor* file_accessor_;
DISALLOW_COPY_AND_ASSIGN(ZipWriter);
};
} // namespace internal
} // namespace zip
#endif // THIRD_PARTY_ZLIB_GOOGLE_ZIP_WRITER_H_
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