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87 lines
2.8 KiB
C++
87 lines
2.8 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_ENTRY_FORMAT_H_
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#define NET_DISK_CACHE_SIMPLE_SIMPLE_ENTRY_FORMAT_H_
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#include <stdint.h>
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#include "net/base/net_export.h"
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namespace disk_cache {
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const uint64_t kSimpleInitialMagicNumber = UINT64_C(0xfcfb6d1ba7725c30);
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const uint64_t kSimpleFinalMagicNumber = UINT64_C(0xf4fa6f45970d41d8);
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const uint64_t kSimpleSparseRangeMagicNumber = UINT64_C(0xeb97bf016553676b);
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// A file containing stream 0 and stream 1 in the Simple cache consists of:
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// - a SimpleFileHeader.
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// - the key.
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// - the data from stream 1.
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// - a SimpleFileEOF record for stream 1.
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// - the data from stream 0.
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// - (optionally) the SHA256 of the key.
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// - a SimpleFileEOF record for stream 0.
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//
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// Because stream 0 data (typically HTTP headers) is on the critical path of
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// requests, on open, the cache reads the end of the record and does not
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// read the SimpleFileHeader. If the key can be validated with a SHA256, then
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// the stream 0 data can be returned to the caller without reading the
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// SimpleFileHeader. If the key SHA256 is not present, then the cache must
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// read the SimpleFileHeader to confirm key equality.
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// A file containing stream 2 in the Simple cache consists of:
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// - a SimpleFileHeader.
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// - the key.
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// - the data.
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// - at the end, a SimpleFileEOF record.
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// This is the number of files we can use for representing normal/dense streams.
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static const int kSimpleEntryNormalFileCount = 2;
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static const int kSimpleEntryStreamCount = 3;
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// Total # of files name we can potentially use; this includes both normal
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// API and sparse streams.
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static const int kSimpleEntryTotalFileCount = kSimpleEntryNormalFileCount + 1;
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// Note that stream 0/stream 1 files rely on the footer to verify the entry,
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// so if the format changes, it's insufficient to change the version here;
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// likely the EOF magic should be updated as well.
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struct NET_EXPORT_PRIVATE SimpleFileHeader {
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SimpleFileHeader();
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uint64_t initial_magic_number;
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uint32_t version;
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uint32_t key_length;
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uint32_t key_hash;
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};
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struct NET_EXPORT_PRIVATE SimpleFileEOF {
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enum Flags {
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FLAG_HAS_CRC32 = (1U << 0),
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FLAG_HAS_KEY_SHA256 = (1U << 1), // Preceding the record if present.
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};
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SimpleFileEOF();
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uint64_t final_magic_number;
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uint32_t flags;
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uint32_t data_crc32;
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// |stream_size| is only used in the EOF record for stream 0.
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uint32_t stream_size;
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};
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struct SimpleFileSparseRangeHeader {
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SimpleFileSparseRangeHeader();
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uint64_t sparse_range_magic_number;
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int64_t offset;
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int64_t length;
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uint32_t data_crc32;
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};
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} // namespace disk_cache
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#endif // NET_DISK_CACHE_SIMPLE_SIMPLE_ENTRY_FORMAT_H_
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