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// Copyright 2014 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 EXTENSIONS_BROWSER_COMPUTED_HASHES_H_
#define EXTENSIONS_BROWSER_COMPUTED_HASHES_H_
#include <stddef.h>
#include <map>
#include <string>
#include <vector>
#include "base/memory/scoped_ptr.h"
namespace base {
class FilePath;
class ListValue;
}
namespace extensions {
// A pair of classes for serialization of a set of SHA256 block hashes computed
// over the files inside an extension.
class ComputedHashes {
public:
class Reader {
public:
Reader();
~Reader();
bool InitFromFile(const base::FilePath& path);
// The block size and hashes for |relative_path| will be copied into the
// out parameters.
bool GetHashes(const base::FilePath& relative_path,
int* block_size,
std::vector<std::string>* hashes);
private:
typedef std::pair<int, std::vector<std::string> > HashInfo;
// This maps a relative path to a pair of (block size, hashes)
std::map<base::FilePath, HashInfo> data_;
};
class Writer {
public:
Writer();
~Writer();
// Adds hashes for |relative_path|. Should not be called more than once
// for a given |relative_path|.
void AddHashes(const base::FilePath& relative_path,
int block_size,
const std::vector<std::string>& hashes);
bool WriteToFile(const base::FilePath& path);
private:
// Each element of this list contains the path and block hashes for one
// file.
scoped_ptr<base::ListValue> file_list_;
};
// Computes the SHA256 hash of each |block_size| chunk in |contents|, placing
// the results into |hashes|.
static void ComputeHashesForContent(const std::string& contents,
size_t block_size,
std::vector<std::string>* hashes);
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_COMPUTED_HASHES_H_
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