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128 lines
3.9 KiB
C++
128 lines
3.9 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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#include "net/disk_cache/simple/simple_util.h"
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#include <limits>
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#include "base/files/file_util.h"
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#include "base/format_macros.h"
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#include "base/logging.h"
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#include "base/numerics/safe_conversions.h"
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#include "base/sha1.h"
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#include "base/strings/string_number_conversions.h"
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#include "base/strings/stringprintf.h"
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#include "base/threading/thread_restrictions.h"
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#include "base/time/time.h"
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#include "net/disk_cache/simple/simple_entry_format.h"
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#include "third_party/zlib/zlib.h"
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namespace {
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// Size of the uint64_t hash_key number in Hex format in a string.
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const size_t kEntryHashKeyAsHexStringSize = 2 * sizeof(uint64_t);
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} // namespace
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namespace disk_cache {
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namespace simple_util {
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std::string ConvertEntryHashKeyToHexString(uint64_t hash_key) {
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const std::string hash_key_str = base::StringPrintf("%016" PRIx64, hash_key);
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DCHECK_EQ(kEntryHashKeyAsHexStringSize, hash_key_str.size());
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return hash_key_str;
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}
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std::string GetEntryHashKeyAsHexString(const std::string& key) {
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std::string hash_key_str =
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ConvertEntryHashKeyToHexString(GetEntryHashKey(key));
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DCHECK_EQ(kEntryHashKeyAsHexStringSize, hash_key_str.size());
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return hash_key_str;
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}
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bool GetEntryHashKeyFromHexString(const base::StringPiece& hash_key,
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uint64_t* hash_key_out) {
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if (hash_key.size() != kEntryHashKeyAsHexStringSize) {
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return false;
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}
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return base::HexStringToUInt64(hash_key, hash_key_out);
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}
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uint64_t GetEntryHashKey(const std::string& key) {
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union {
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unsigned char sha_hash[base::kSHA1Length];
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uint64_t key_hash;
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} u;
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base::SHA1HashBytes(reinterpret_cast<const unsigned char*>(key.data()),
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key.size(), u.sha_hash);
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return u.key_hash;
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}
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std::string GetFilenameFromEntryFileKeyAndFileIndex(
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const SimpleFileTracker::EntryFileKey& key,
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int file_index) {
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// TODO(morlovich): create a todelete_..._ file for a non-zero
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// doom_generation.
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DCHECK_EQ(0u, key.doom_generation);
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return base::StringPrintf("%016" PRIx64 "_%1d", key.entry_hash, file_index);
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}
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std::string GetSparseFilenameFromEntryFileKey(
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const SimpleFileTracker::EntryFileKey& key) {
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// TODO(morlovich): create a todelete_..._ file for a non-zero
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// doom_generation.
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DCHECK_EQ(0u, key.doom_generation);
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return base::StringPrintf("%016" PRIx64 "_s", key.entry_hash);
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}
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std::string GetFilenameFromKeyAndFileIndex(const std::string& key,
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int file_index) {
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return GetEntryHashKeyAsHexString(key) +
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base::StringPrintf("_%1d", file_index);
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}
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size_t GetHeaderSize(size_t key_length) {
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return sizeof(SimpleFileHeader) + key_length;
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}
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int32_t GetDataSizeFromFileSize(size_t key_length, int64_t file_size) {
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int64_t data_size =
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file_size - key_length - sizeof(SimpleFileHeader) - sizeof(SimpleFileEOF);
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return base::checked_cast<int32_t>(data_size);
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}
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int64_t GetFileSizeFromDataSize(size_t key_length, int32_t data_size) {
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return data_size + key_length + sizeof(SimpleFileHeader) +
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sizeof(SimpleFileEOF);
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}
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int GetFileIndexFromStreamIndex(int stream_index) {
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return (stream_index == 2) ? 1 : 0;
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}
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bool GetMTime(const base::FilePath& path, base::Time* out_mtime) {
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DCHECK(out_mtime);
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base::File::Info file_info;
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if (!base::GetFileInfo(path, &file_info))
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return false;
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*out_mtime = file_info.last_modified;
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return true;
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}
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uint32_t Crc32(const char* data, int length) {
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uint32_t empty_crc = crc32(0, Z_NULL, 0);
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if (length == 0)
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return empty_crc;
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return crc32(empty_crc, reinterpret_cast<const Bytef*>(data), length);
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}
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uint32_t IncrementalCrc32(uint32_t previous_crc, const char* data, int length) {
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return crc32(previous_crc, reinterpret_cast<const Bytef*>(data), length);
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}
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} // namespace simple_util
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} // namespace disk_cache
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