| /* |
| * Copyright (C) 2010 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_CACHED_METADATA_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_CACHED_METADATA_H_ |
| |
| #include <stdint.h> |
| #include "base/memory/scoped_refptr.h" |
| #include "mojo/public/cpp/base/big_buffer.h" |
| #include "third_party/blink/renderer/platform/platform_export.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h" |
| #include "third_party/blink/renderer/platform/wtf/assertions.h" |
| #include "third_party/blink/renderer/platform/wtf/ref_counted.h" |
| #include "third_party/blink/renderer/platform/wtf/std_lib_extras.h" |
| #include "third_party/blink/renderer/platform/wtf/vector.h" |
| |
| namespace blink { |
| |
| // |m_serializedData| consists of a 32 bit marker, 32 bits type ID, and actual |
| // data. |
| constexpr size_t kCacheDataTypeStart = sizeof(uint32_t); |
| constexpr size_t kCachedMetaDataStart = kCacheDataTypeStart + sizeof(uint32_t); |
| |
| // Metadata retrieved from the embedding application's cache. |
| // |
| // Serialized data is NOT portable across architectures. However, reading the |
| // data type ID will reject data generated with a different byte-order. |
| class PLATFORM_EXPORT CachedMetadata : public RefCounted<CachedMetadata> { |
| USING_FAST_MALLOC(CachedMetadata); |
| |
| public: |
| static scoped_refptr<CachedMetadata> Create(uint32_t data_type_id, |
| const uint8_t* data, |
| size_t size) { |
| return base::AdoptRef( |
| new CachedMetadata(data_type_id, data, SafeCast<wtf_size_t>(size))); |
| } |
| |
| static scoped_refptr<CachedMetadata> CreateFromSerializedData( |
| const uint8_t* data, |
| size_t); |
| static scoped_refptr<CachedMetadata> CreateFromSerializedData( |
| Vector<uint8_t> data); |
| static scoped_refptr<CachedMetadata> CreateFromSerializedData( |
| mojo_base::BigBuffer data); |
| |
| ~CachedMetadata() = default; |
| |
| base::span<const uint8_t> SerializedData() { |
| return base::make_span(RawData(), RawSize()); |
| } |
| |
| uint32_t DataTypeID() const { |
| DCHECK_GE(RawSize(), kCachedMetaDataStart); |
| return *reinterpret_cast_ptr<uint32_t*>( |
| const_cast<uint8_t*>(RawData() + kCacheDataTypeStart)); |
| } |
| |
| const uint8_t* Data() const { |
| DCHECK_GE(RawSize(), kCachedMetaDataStart); |
| return RawData() + kCachedMetaDataStart; |
| } |
| |
| uint32_t size() const { |
| DCHECK_GE(RawSize(), kCachedMetaDataStart); |
| return RawSize() - kCachedMetaDataStart; |
| } |
| |
| private: |
| explicit CachedMetadata(Vector<uint8_t> data); |
| CachedMetadata(uint32_t data_type_id, const uint8_t* data, wtf_size_t); |
| explicit CachedMetadata(mojo_base::BigBuffer data); |
| |
| const uint8_t* RawData() const { |
| return buffer_.size() ? buffer_.data() : vector_.data(); |
| } |
| uint32_t RawSize() const { |
| return buffer_.size() ? SafeCast<uint32_t>(buffer_.size()) : vector_.size(); |
| } |
| |
| // Since the serialization format supports random access, storing it in |
| // serialized form avoids need for a copy during serialization. |
| Vector<uint8_t> vector_; |
| mojo_base::BigBuffer buffer_; |
| }; |
| |
| } // namespace blink |
| |
| #endif |