зеркало из https://github.com/mozilla/gecko-dev.git
89 строки
2.4 KiB
C++
89 строки
2.4 KiB
C++
//* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef ChunkSet_h__
|
|
#define ChunkSet_h__
|
|
|
|
#include "Entries.h"
|
|
#include "nsString.h"
|
|
#include "nsTArray.h"
|
|
|
|
namespace mozilla {
|
|
namespace safebrowsing {
|
|
|
|
/**
|
|
* Store the chunk numbers as an array of ranges of uint32_t.
|
|
* We need chunk numbers in order to ask for incremental updates from the
|
|
* server.
|
|
*/
|
|
class ChunkSet {
|
|
public:
|
|
nsresult Serialize(nsACString& aStr);
|
|
nsresult Set(uint32_t aChunk);
|
|
bool Has(uint32_t chunk) const;
|
|
nsresult Merge(const ChunkSet& aOther);
|
|
uint32_t Length() const;
|
|
nsresult Remove(const ChunkSet& aOther);
|
|
void Clear();
|
|
|
|
nsresult Write(nsIOutputStream* aOut) const;
|
|
nsresult Read(nsIInputStream* aIn, uint32_t aNumElements);
|
|
|
|
private:
|
|
class Range {
|
|
public:
|
|
Range(uint32_t aBegin, uint32_t aEnd) : mBegin(aBegin), mEnd(aEnd) {}
|
|
|
|
uint32_t Length() const;
|
|
nsresult Remove(const Range& aRange, ChunkSet& aRemainderSet) const;
|
|
bool FoldLeft(const Range& aRange);
|
|
|
|
bool operator==(const Range& rhs) const { return mBegin == rhs.mBegin; }
|
|
bool operator<(const Range& rhs) const { return mBegin < rhs.mBegin; }
|
|
|
|
uint32_t Begin() const { return mBegin; }
|
|
void Begin(const uint32_t aBegin) { mBegin = aBegin; }
|
|
uint32_t End() const { return mEnd; }
|
|
void End(const uint32_t aEnd) { mEnd = aEnd; }
|
|
|
|
bool Contains(const Range& aRange) const {
|
|
return mBegin <= aRange.mBegin && aRange.mEnd <= mEnd;
|
|
}
|
|
bool Precedes(const Range& aRange) const {
|
|
return mEnd + 1 == aRange.mBegin;
|
|
}
|
|
|
|
struct IntersectionComparator {
|
|
int operator()(const Range& aRange) const {
|
|
if (aRange.mBegin > mTarget.mEnd) {
|
|
return -1;
|
|
}
|
|
if (mTarget.mBegin > aRange.mEnd) {
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
explicit IntersectionComparator(const Range& aTarget)
|
|
: mTarget(aTarget) {}
|
|
const Range& mTarget;
|
|
};
|
|
|
|
private:
|
|
uint32_t mBegin;
|
|
uint32_t mEnd;
|
|
};
|
|
|
|
static const size_t IO_BUFFER_SIZE = 1024;
|
|
FallibleTArray<Range> mRanges;
|
|
|
|
bool HasSubrange(const Range& aSubrange) const;
|
|
};
|
|
|
|
} // namespace safebrowsing
|
|
} // namespace mozilla
|
|
|
|
#endif
|