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97 lines
3.5 KiB
C++
97 lines
3.5 KiB
C++
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_DISK_CACHE_SIMPLE_SIMPLE_UTIL_H_
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#define NET_DISK_CACHE_SIMPLE_SIMPLE_UTIL_H_
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#include <stdint.h>
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#include <string>
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#include "base/strings/string_piece.h"
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#include "net/base/net_export.h"
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#include "net/disk_cache/simple/simple_file_tracker.h"
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namespace base {
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class FilePath;
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class Time;
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}
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namespace disk_cache {
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namespace simple_util {
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NET_EXPORT_PRIVATE std::string ConvertEntryHashKeyToHexString(
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uint64_t hash_key);
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// |key| is the regular cache key, such as an URL.
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// Returns the Hex ascii representation of the uint64_t hash_key.
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NET_EXPORT_PRIVATE std::string GetEntryHashKeyAsHexString(
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const std::string& key);
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// |key| is the regular HTTP Cache key, which is a URL.
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// Returns the hash of the key as uint64_t.
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NET_EXPORT_PRIVATE uint64_t GetEntryHashKey(const std::string& key);
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// Parses the |hash_key| string into a uint64_t buffer.
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// |hash_key| string must be of the form: FFFFFFFFFFFFFFFF .
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NET_EXPORT_PRIVATE bool GetEntryHashKeyFromHexString(
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const base::StringPiece& hash_key,
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uint64_t* hash_key_out);
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// Given a |key| for a (potential) entry in the simple backend and the |index|
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// of a stream on that entry, returns the filename in which that stream would be
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// stored.
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NET_EXPORT_PRIVATE std::string GetFilenameFromKeyAndFileIndex(
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const std::string& key,
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int file_index);
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// Same as |GetFilenameFromKeyAndIndex| above, but using a numeric key.
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NET_EXPORT_PRIVATE std::string GetFilenameFromEntryFileKeyAndFileIndex(
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const SimpleFileTracker::EntryFileKey& key,
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int file_index);
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// Given a |key| for an entry, returns the name of the sparse data file.
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NET_EXPORT_PRIVATE std::string GetSparseFilenameFromEntryFileKey(
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const SimpleFileTracker::EntryFileKey& key);
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// Given the size of a key, the size in bytes of the header at the beginning
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// of a simple cache file.
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size_t GetHeaderSize(size_t key_length);
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// Given the size of a file holding a stream in the simple backend and the key
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// to an entry, returns the number of bytes in the stream.
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NET_EXPORT_PRIVATE int32_t GetDataSizeFromFileSize(size_t key_length,
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int64_t file_size);
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// Given the size of a stream in the simple backend and the key to an entry,
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// returns the number of bytes in the file.
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NET_EXPORT_PRIVATE int64_t GetFileSizeFromDataSize(size_t key_length,
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int32_t data_size);
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// Given the stream index, returns the number of the file the stream is stored
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// in.
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NET_EXPORT_PRIVATE int GetFileIndexFromStreamIndex(int stream_index);
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// Fills |out_time| with the time the file last modified time. Unlike the
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// functions in file.h, the time resolution is milliseconds.
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NET_EXPORT_PRIVATE bool GetMTime(const base::FilePath& path,
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base::Time* out_mtime);
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// Deletes a file, insuring POSIX semantics. Provided that all open handles to
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// this file were opened with File::FLAG_SHARE_DELETE, it is possible to delete
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// an open file and continue to use that file. After deleting an open file, it
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// is possible to immediately create a new file with the same name.
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NET_EXPORT_PRIVATE bool SimpleCacheDeleteFile(const base::FilePath& path);
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uint32_t Crc32(const char* data, int length);
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uint32_t IncrementalCrc32(uint32_t previous_crc, const char* data, int length);
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} // namespace simple_util
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} // namespace disk_cache
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#endif // NET_DISK_CACHE_SIMPLE_SIMPLE_UTIL_H_
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