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// Copyright (c) 2008 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.
// DataPack represents a read-only view onto an on-disk file that contains
// (key, value) pairs of data. It's used to store static resources like
// translation strings and images.
#ifndef BASE_DATA_PACK_H_
#define BASE_DATA_PACK_H_
#include <map>
#include "base/basictypes.h"
#include "base/ref_counted_memory.h"
#include "base/scoped_ptr.h"
namespace file_util {
class MemoryMappedFile;
}
class FilePath;
namespace base {
class StringPiece;
class DataPack {
public:
DataPack();
~DataPack();
// Load a pack file from |path|, returning false on error.
bool Load(const FilePath& path);
// Get resource by id |resource_id|, filling in |data|.
// The data is owned by the DataPack object and should not be modified.
// Returns false if the resource id isn't found.
bool GetStringPiece(uint32 resource_id, StringPiece* data);
// Like GetStringPiece(), but returns a reference to memory. This interface
// is used for image data, while the StringPiece interface is usually used
// for localization strings.
RefCountedStaticMemory* GetStaticMemory(uint32 resource_id);
// Writes a pack file containing |resources| to |path|.
static bool WritePack(const FilePath& path,
const std::map<uint32, StringPiece>& resources);
private:
// The memory-mapped data.
scoped_ptr<file_util::MemoryMappedFile> mmap_;
// Number of resources in the data.
size_t resource_count_;
DISALLOW_COPY_AND_ASSIGN(DataPack);
};
} // namespace base
#endif // BASE_DATA_PACK_H_
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