77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
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/*
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* Copyright 2016 Google Inc.
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*
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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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*/
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#ifndef SkUrlDataManager_DEFINED
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#define SkUrlDataManager_DEFINED
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#include "SkChecksum.h"
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#include "SkData.h"
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#include "SkString.h"
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#include "SkTDynamicHash.h"
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/*
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* A simple class which allows clients to add opaque data types, and returns a url where this data
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* will be hosted. Its up to the owner of this class to actually serve the data.
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*/
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bool operator==(const SkData& a, const SkData& b);
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class UrlDataManager {
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public:
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UrlDataManager(SkString rootUrl);
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~UrlDataManager() { this->reset(); }
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/*
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* Adds a data blob to the cache with a particular content type. UrlDataManager will hash
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* the blob data to ensure uniqueness
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*/
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SkString addData(SkData*, const char* contentType);
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struct UrlData : public SkRefCnt {
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SkString fUrl;
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SkString fContentType;
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SkAutoTUnref<SkData> fData;
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};
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/*
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* returns the UrlData object which should be hosted at 'url'
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*/
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UrlData* getDataFromUrl(SkString url) {
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return fUrlLookup.find(url);
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}
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void reset();
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private:
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struct LookupTrait {
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// We use the data as a hash, this is not really optimal but is fine until proven otherwise
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static const SkData& GetKey(const UrlData& data) {
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return *data.fData.get();
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}
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static uint32_t Hash(const SkData& key) {
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return SkChecksum::Murmur3(key.bytes(), key.size());
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}
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};
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struct ReverseLookupTrait {
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static const SkString& GetKey(const UrlData& data) {
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return data.fUrl;
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}
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static uint32_t Hash(const SkString& key) {
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return SkChecksum::Murmur3(key.c_str(), strlen(key.c_str()));
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}
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};
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SkString fRootUrl;
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SkTDynamicHash<UrlData, SkData, LookupTrait> fCache;
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SkTDynamicHash<UrlData, SkString, ReverseLookupTrait> fUrlLookup;
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uint32_t fDataId;
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};
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#endif
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