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