Move files from zip_archiver/unpacker/ to zip_archiver/.

ui/file_manager/zip_archiver/unpacker/cpp/volume_archive_libarchive.h

-// Copyright 2014 The Chromium OS 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 VOLUME_ARCHIVE_LIBARCHIVE_H_
-#define VOLUME_ARCHIVE_LIBARCHIVE_H_
-
-#include <string>
-
-#include "archive.h"
-
-#include "volume_archive.h"
-
-// A namespace with constants used by VolumeArchiveLibarchive.
-namespace volume_archive_constants {
-
-const char kArchiveReadNewError[] = "Could not allocate archive.";
-const char kFileNotFound[] = "File not found for read data request.";
-const char kVolumeReaderError[] = "VolumeReader failed to retrieve data.";
-const char kArchiveSupportErrorPrefix[] = "Error at support rar/zip format: ";
-const char kArchiveOpenErrorPrefix[] = "Error at open archive: ";
-const char kArchiveNextHeaderErrorPrefix[] =
-    "Error at reading next header for metadata: ";
-const char kArchiveReadDataErrorPrefix[] = "Error at reading data: ";
-const char kArchiveReadFreeErrorPrefix[] = "Error at archive free: ";
-
-// The size of the buffer used to skip unnecessary data.
-// Should be positive and less than size_t maximum.
-const int64_t kDummyBufferSize = 512 * 1024;  // 512 KB
-
-// The size of the buffer used by ReadInProgress to decompress data.
-// Should be positive and less than size_t maximum.
-const int64_t kDecompressBufferSize = 512 * 1024;  // 512 KB.
-
-// The maximum data chunk size for VolumeReader::Read requests.
-// Should be positive.
-const int64_t kMaximumDataChunkSize = 512 * 1024;  // 512 KB.
-
-// The minimum data chunk size for VolumeReader::Read requests.
-// Should be positive.
-const int64_t kMinimumDataChunkSize = 32 * 1024;  // 16 KB.
-
-}  // namespace volume_archive_constants
-
-// Defines an implementation of VolumeArchive that wraps all libarchive
-// operations.
-class VolumeArchiveLibarchive : public VolumeArchive {
- public:
-  explicit VolumeArchiveLibarchive(VolumeReader* reader);
-
-  virtual ~VolumeArchiveLibarchive();
-
-  // See volume_archive_interface.h.
-  virtual bool Init(const std::string& encoding);
-
-  // See volume_archive_interface.h.
-  virtual Result GetNextHeader();
-  virtual Result GetNextHeader(const char** path_name,
-                               int64_t* size,
-                               bool* is_directory,
-                               time_t* modification_time);
-
-  // See volume_archive_interface.h.
-  virtual bool SeekHeader(int64_t index);
-
-  // See volume_archive_interface.h.
-  virtual int64_t ReadData(int64_t offset,
-                           int64_t length,
-                           const char** buffer);
-
-  // See volume_archive_interface.h.
-  virtual void MaybeDecompressAhead();
-
-  // See volume_archive_interface.h.
-  virtual bool Cleanup();
-
-  int64_t reader_data_size() const { return reader_data_size_; }
-
- private:
-  // Decompress length bytes of data starting from offset.
-  void DecompressData(int64_t offset, int64_t length);
-
-  // The size of the requested data from VolumeReader.
-  int64_t reader_data_size_;
-
-  // The libarchive correspondent archive object.
-  archive* archive_;
-
-  // The last reached entry with VolumeArchiveLibarchive::GetNextHeader.
-  archive_entry* current_archive_entry_;
-
-  // The data offset, which will be offset + length after last read
-  // operation, where offset and length are method parameters for
-  // VolumeArchiveLibarchive::ReadData. Data offset is used to improve
-  // performance for consecutive calls to VolumeArchiveLibarchive::ReadData.
-  //
-  // Intead of starting the read from the beginning for every
-  // VolumeArchiveLibarchive::ReadData, the next call will start
-  // from last_read_data_offset_ in case the offset parameter of
-  // VolumeArchiveLibarchive::ReadData has the same value as
-  // last_read_data_offset_. This avoids decompressing again the bytes at
-  // the begninning of the file, which is the average case scenario.
-  // But in case the offset parameter is different than last_read_data_offset_,
-  // then dummy_buffer_ will be used to ignore unused bytes.
-  int64_t last_read_data_offset_;
-
-  // The length of the last VolumeArchiveLibarchive::ReadData. Used for
-  // decompress ahead.
-  int64_t last_read_data_length_;
-
-  // Dummy buffer for unused data read using VolumeArchiveLibarchive::ReadData.
-  // Sometimes VolumeArchiveLibarchive::ReadData can require reading from
-  // offsets different from last_read_data_offset_. In this case some bytes
-  // must be skipped. Because seeking is not possible inside compressed files,
-  // the bytes will be discarded using this buffer.
-  char dummy_buffer_[volume_archive_constants::kDummyBufferSize];
-
-  // The address where the decompressed data starting from
-  // decompressed_offset_ is stored. It should point to a valid location
-  // inside decompressed_data_buffer_. Necesssary in order to NOT throw
-  // away unused decompressed bytes as throwing them away would mean in some
-  // situations restarting decompressing the file from the beginning.
-  char* decompressed_data_;
-
-  // The actual buffer that contains the decompressed data.
-  char decompressed_data_buffer_
-      [volume_archive_constants::kDecompressBufferSize];
-
-  // The size of valid data starting from decompressed_data_ that is stored
-  // inside decompressed_data_buffer_.
-  int64_t decompressed_data_size_;
-
-  // True if VolumeArchiveLibarchive::DecompressData failed.
-  bool decompressed_error_;
-};
-
-#endif  // VOLUME_ARCHIVE_LIBARCHIVE_H_