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Unified Diff: courgette/third_party/paged_array.h

Issue 1961963003: Move //courgette/third_party to subfolder. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Fixes according to comments Created 4 years, 7 months ago
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Index: courgette/third_party/paged_array.h
diff --git a/courgette/third_party/paged_array.h b/courgette/third_party/paged_array.h
deleted file mode 100644
index 48a92f171fb1a804d9947ba419c1b7a60027d7ab..0000000000000000000000000000000000000000
--- a/courgette/third_party/paged_array.h
+++ /dev/null
@@ -1,84 +0,0 @@
-// Copyright (c) 2010 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.
-
-// PagedArray implements an array stored using many fixed-size pages.
-//
-// PagedArray is a work-around to allow large arrays to be allocated when there
-// is too much address space fragmentation for allocating the large arrays as
-// contigous arrays.
-
-#ifndef COURGETTE_BSDIFF_PAGED_ARRAY_H_
-#define COURGETTE_BSDIFF_PAGED_ARRAY_H_
-
-#include <stddef.h>
-
-#include "base/macros.h"
-#include "base/process/memory.h"
-
-namespace courgette {
-
-// PagedArray implements an array stored using many fixed-size pages.
-template<typename T>
-class PagedArray {
- enum {
- // Page size in elements. Page size of 2^18 * sizeof(T) is 1MB for T = int.
- kLogPageSize = 18,
- kPageSize = 1 << kLogPageSize
- };
-
- public:
- PagedArray() : pages_(NULL), page_count_(0) {}
-
- ~PagedArray() { clear(); }
-
- T& operator[](size_t i) {
- size_t page = i >> kLogPageSize;
- size_t offset = i & (kPageSize - 1);
- // It is tempting to add a DCHECK(page < page_count_), but that makes
- // bsdiff_create run 2x slower (even when compiled optimized.)
- return pages_[page][offset];
- }
-
- // Allocates storage for |size| elements. Returns true on success and false if
- // allocation fails.
- bool Allocate(size_t size) {
- clear();
- size_t pages_needed = (size + kPageSize - 1) >> kLogPageSize;
- if (!base::UncheckedMalloc(sizeof(T*) * pages_needed,
- reinterpret_cast<void**>(&pages_))) {
- return false;
- }
-
- for (page_count_ = 0; page_count_ < pages_needed; ++page_count_) {
- T* block = nullptr;
- if (!base::UncheckedMalloc(sizeof(T) * kPageSize,
- reinterpret_cast<void**>(&block))) {
- clear();
- return false;
- }
- pages_[page_count_] = block;
- }
- return true;
- }
-
- // Releases all storage. May be called more than once.
- void clear() {
- if (pages_ != NULL) {
- while (page_count_ != 0) {
- --page_count_;
- free(pages_[page_count_]);
- }
- free(pages_);
- pages_ = NULL;
- }
- }
-
- private:
- T** pages_;
- size_t page_count_;
-
- DISALLOW_COPY_AND_ASSIGN(PagedArray);
-};
-} // namespace
-#endif // COURGETTE_BSDIFF_PAGED_ARRAY_H_
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