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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #include "net/disk_cache/blockfile/block_files.h" | 5 #include "net/disk_cache/blockfile/block_files.h" |
| 6 | 6 |
| 7 #include "base/atomicops.h" | 7 #include "base/atomicops.h" |
| 8 #include "base/files/file_path.h" | 8 #include "base/files/file_path.h" |
| 9 #include "base/metrics/histogram.h" | 9 #include "base/metrics/histogram.h" |
| 10 #include "base/strings/string_util.h" | 10 #include "base/strings/string_util.h" |
| 11 #include "base/strings/stringprintf.h" | 11 #include "base/strings/stringprintf.h" |
| 12 #include "base/threading/thread_checker.h" | 12 #include "base/threading/thread_checker.h" |
| 13 #include "base/time/time.h" | 13 #include "base/time/time.h" |
| 14 #include "net/disk_cache/blockfile/file_lock.h" | 14 #include "net/disk_cache/blockfile/file_lock.h" |
| 15 #include "net/disk_cache/blockfile/stress_support.h" | 15 #include "net/disk_cache/blockfile/stress_support.h" |
| 16 #include "net/disk_cache/blockfile/trace.h" | 16 #include "net/disk_cache/blockfile/trace.h" |
| 17 #include "net/disk_cache/cache_util.h" | 17 #include "net/disk_cache/cache_util.h" |
| 18 | 18 |
| 19 using base::TimeTicks; | 19 using base::TimeTicks; |
| 20 | 20 |
| 21 namespace { | 21 namespace { |
| 22 | 22 |
| 23 const char* kBlockName = "data_"; | 23 const char kBlockName[] = "data_"; |
| 24 | 24 |
| 25 // This array is used to perform a fast lookup of the nibble bit pattern to the | 25 // This array is used to perform a fast lookup of the nibble bit pattern to the |
| 26 // type of entry that can be stored there (number of consecutive blocks). | 26 // type of entry that can be stored there (number of consecutive blocks). |
| 27 const char s_types[16] = {4, 3, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0}; | 27 const char s_types[16] = {4, 3, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0}; |
| 28 | 28 |
| 29 // Returns the type of block (number of consecutive blocks that can be stored) | 29 // Returns the type of block (number of consecutive blocks that can be stored) |
| 30 // for a given nibble of the bitmap. | 30 // for a given nibble of the bitmap. |
| 31 inline int GetMapBlockType(uint32 value) { | 31 inline int GetMapBlockType(uint32 value) { |
| 32 value &= 0xf; | 32 value &= 0xf; |
| 33 return s_types[value]; | 33 return s_types[value]; |
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| 722 } | 722 } |
| 723 | 723 |
| 724 base::FilePath BlockFiles::Name(int index) { | 724 base::FilePath BlockFiles::Name(int index) { |
| 725 // The file format allows for 256 files. | 725 // The file format allows for 256 files. |
| 726 DCHECK(index < 256 && index >= 0); | 726 DCHECK(index < 256 && index >= 0); |
| 727 std::string tmp = base::StringPrintf("%s%d", kBlockName, index); | 727 std::string tmp = base::StringPrintf("%s%d", kBlockName, index); |
| 728 return path_.AppendASCII(tmp); | 728 return path_.AppendASCII(tmp); |
| 729 } | 729 } |
| 730 | 730 |
| 731 } // namespace disk_cache | 731 } // namespace disk_cache |
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