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Patrick Boutot
70 lines
2.3 KiB
C++
70 lines
2.3 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreMinimal.h"
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#include "CborTypes.h"
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/**
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* Reader for a the cbor protocol encoded stream
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* @see http://cbor.io
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*/
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class CBOR_API FCborReader
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{
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public:
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/**
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* Construct a CBOR reader.
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* @param InStream The stream containing the CBOR data.
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* @param InReaderEndianness Specify which endianness should be use to read the archive.
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* @note CBOR standard endianness is big endian. For interoperability with external tools, the standard endianness should be used. For internal usage, the platform endianness is faster.
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*/
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FCborReader(FArchive* InStream, ECborEndianness InReaderEndianness = ECborEndianness::Platform);
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~FCborReader();
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/** @return the archive we are reading from. */
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const FArchive* GetArchive() const;
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/** @return true if the reader is in error. */
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bool IsError() const;
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/** @return A cbor Header containing an error code as its raw code. */
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FCborHeader GetError() const;
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/**
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* The cbor context of the reader can either be
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* a container context or a dummy.
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* A reference to the context shouldn't be held while calling ReadNext.
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* @return The current cbor context. */
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const FCborContext& GetContext() const;
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/**
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* Read the next value from the cbor stream.
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* @param OutContext the context to read the value into.
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* @return true if successful, false if an error was returned or the end of the stream was reached.
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*/
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bool ReadNext(FCborContext& OutContext);
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/**
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* Skip a container of ContainerType type
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* @param ContainerType the container we expect to skip.
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* @return true if successful, false if the current container wasn't a ContainerType or an error occurred.
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*/
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bool SkipContainer(ECborCode ContainerType);
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private:
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/** Read a uint value from Ar into OutContext and also return it. */
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static uint64 ReadUIntValue(FCborContext& OutContext, FArchive& Ar);
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/** Read a Prim value from Ar into OutContext. */
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static void ReadPrimValue(FCborContext& OutContext, FArchive& Ar);
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/** Set an error in the reader and return it. */
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FCborHeader SetError(ECborCode ErrorCode);
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/** The archive we are reading from. */
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FArchive* Stream;
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/** Holds the context stack for the reader. */
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TArray<FCborContext> ContextStack;
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/** Read the CBOR data using the specified endianness. */
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ECborEndianness Endianness;
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};
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