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Unified Diff: net/disk_cache/blockfile/addr.h

Issue 992733002: Remove //net (except for Android test stuff) and sdch (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 5 years, 9 months ago
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Index: net/disk_cache/blockfile/addr.h
diff --git a/net/disk_cache/blockfile/addr.h b/net/disk_cache/blockfile/addr.h
deleted file mode 100644
index a5e4367757b54c41c7df93eedefbbd0a16678350..0000000000000000000000000000000000000000
--- a/net/disk_cache/blockfile/addr.h
+++ /dev/null
@@ -1,188 +0,0 @@
-// Copyright (c) 2012 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.
-
-// This is an internal class that handles the address of a cache record.
-// See net/disk_cache/disk_cache.h for the public interface of the cache.
-
-#ifndef NET_DISK_CACHE_BLOCKFILE_ADDR_H_
-#define NET_DISK_CACHE_BLOCKFILE_ADDR_H_
-
-#include "net/base/net_export.h"
-#include "net/disk_cache/blockfile/disk_format_base.h"
-
-namespace disk_cache {
-
-enum FileType {
- EXTERNAL = 0,
- RANKINGS = 1,
- BLOCK_256 = 2,
- BLOCK_1K = 3,
- BLOCK_4K = 4,
- BLOCK_FILES = 5,
- BLOCK_ENTRIES = 6,
- BLOCK_EVICTED = 7
-};
-
-const int kMaxBlockSize = 4096 * 4;
-const int16 kMaxBlockFile = 255;
-const int kMaxNumBlocks = 4;
-const int16 kFirstAdditionalBlockFile = 4;
-const size_t kFirstAdditionalBlockFileV3 = 7;
-
-// Defines a storage address for a cache record
-//
-// Header:
-// 1000 0000 0000 0000 0000 0000 0000 0000 : initialized bit
-// 0111 0000 0000 0000 0000 0000 0000 0000 : file type
-//
-// File type values:
-// 0 = separate file on disk
-// 1 = rankings block file
-// 2 = 256 byte block file
-// 3 = 1k byte block file
-// 4 = 4k byte block file
-// 5 = external files block file
-// 6 = active entries block file
-// 7 = evicted entries block file
-//
-// If separate file:
-// 0000 1111 1111 1111 1111 1111 1111 1111 : file# 0 - 268,435,456 (2^28)
-//
-// If block file:
-// 0000 1100 0000 0000 0000 0000 0000 0000 : reserved bits
-// 0000 0011 0000 0000 0000 0000 0000 0000 : number of contiguous blocks 1-4
-// 0000 0000 1111 1111 0000 0000 0000 0000 : file selector 0 - 255
-// 0000 0000 0000 0000 1111 1111 1111 1111 : block# 0 - 65,535 (2^16)
-//
-// Note that an Addr can be used to "point" to a variety of different objects,
-// from a given type of entry to random blobs of data. Conceptually, an Addr is
-// just a number that someone can inspect to find out how to locate the desired
-// record. Most users will not care about the specific bits inside Addr, for
-// example, what parts of it point to a file number; only the code that has to
-// select a specific file would care about those specific bits.
-//
-// From a general point of view, an Addr has a total capacity of 2^24 entities,
-// in that it has 24 bits that can identify individual records. Note that the
-// address space is bigger for independent files (2^28), but that would not be
-// the general case.
-class NET_EXPORT_PRIVATE Addr {
- public:
- Addr() : value_(0) {}
- explicit Addr(CacheAddr address) : value_(address) {}
- Addr(FileType file_type, int max_blocks, int block_file, int index) {
- value_ = ((file_type << kFileTypeOffset) & kFileTypeMask) |
- (((max_blocks - 1) << kNumBlocksOffset) & kNumBlocksMask) |
- ((block_file << kFileSelectorOffset) & kFileSelectorMask) |
- (index & kStartBlockMask) | kInitializedMask;
- }
-
- CacheAddr value() const { return value_; }
- void set_value(CacheAddr address) {
- value_ = address;
- }
-
- bool is_initialized() const {
- return (value_ & kInitializedMask) != 0;
- }
-
- bool is_separate_file() const {
- return (value_ & kFileTypeMask) == 0;
- }
-
- bool is_block_file() const {
- return !is_separate_file();
- }
-
- FileType file_type() const {
- return static_cast<FileType>((value_ & kFileTypeMask) >> kFileTypeOffset);
- }
-
- int FileNumber() const {
- if (is_separate_file())
- return value_ & kFileNameMask;
- else
- return ((value_ & kFileSelectorMask) >> kFileSelectorOffset);
- }
-
- int start_block() const;
- int num_blocks() const;
- bool SetFileNumber(int file_number);
- int BlockSize() const {
- return BlockSizeForFileType(file_type());
- }
-
- bool operator==(Addr other) const {
- return value_ == other.value_;
- }
-
- bool operator!=(Addr other) const {
- return value_ != other.value_;
- }
-
- static int BlockSizeForFileType(FileType file_type) {
- switch (file_type) {
- case RANKINGS:
- return 36;
- case BLOCK_256:
- return 256;
- case BLOCK_1K:
- return 1024;
- case BLOCK_4K:
- return 4096;
- case BLOCK_FILES:
- return 8;
- case BLOCK_ENTRIES:
- return 104;
- case BLOCK_EVICTED:
- return 48;
- default:
- return 0;
- }
- }
-
- static FileType RequiredFileType(int size) {
- if (size < 1024)
- return BLOCK_256;
- else if (size < 4096)
- return BLOCK_1K;
- else if (size <= 4096 * 4)
- return BLOCK_4K;
- else
- return EXTERNAL;
- }
-
- static int RequiredBlocks(int size, FileType file_type) {
- int block_size = BlockSizeForFileType(file_type);
- return (size + block_size - 1) / block_size;
- }
-
- // Returns true if this address looks like a valid one.
- bool SanityCheckV2() const;
- bool SanityCheckV3() const;
- bool SanityCheckForEntryV2() const;
- bool SanityCheckForEntryV3() const;
- bool SanityCheckForRankings() const;
-
- private:
- uint32 reserved_bits() const {
- return value_ & kReservedBitsMask;
- }
-
- static const uint32 kInitializedMask = 0x80000000;
- static const uint32 kFileTypeMask = 0x70000000;
- static const uint32 kFileTypeOffset = 28;
- static const uint32 kReservedBitsMask = 0x0c000000;
- static const uint32 kNumBlocksMask = 0x03000000;
- static const uint32 kNumBlocksOffset = 24;
- static const uint32 kFileSelectorMask = 0x00ff0000;
- static const uint32 kFileSelectorOffset = 16;
- static const uint32 kStartBlockMask = 0x0000FFFF;
- static const uint32 kFileNameMask = 0x0FFFFFFF;
-
- CacheAddr value_;
-};
-
-} // namespace disk_cache
-
-#endif // NET_DISK_CACHE_BLOCKFILE_ADDR_H_
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