77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
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// TransferEncodingParser.h
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// Declares the cTransferEncodingParser class representing the parser for the various transfer encodings (chunked etc.)
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#pragma once
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// fwd:
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class cTransferEncodingParser;
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typedef std::shared_ptr<cTransferEncodingParser> cTransferEncodingParserPtr;
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/** Used as both the interface that all the parsers share and the (static) factory creating such parsers. */
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class cTransferEncodingParser
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{
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public:
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class cCallbacks
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{
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public:
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// Force a virtual destructor in descendants
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virtual ~cCallbacks() {}
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/** Called when an error has occured while parsing. */
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virtual void OnError(const AString & a_ErrorDescription) = 0;
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/** Called for each chunk of the incoming body data. */
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virtual void OnBodyData(const void * a_Data, size_t a_Size) = 0;
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/** Called when the entire body has been reported by OnBodyData(). */
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virtual void OnBodyFinished(void) = 0;
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};
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// Force a virtual destructor in all descendants
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virtual ~cTransferEncodingParser() {}
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/** Parses the incoming data and calls the appropriate callbacks.
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Returns the number of bytes from the end of a_Data that is already not part of this message (if the parser can detect it).
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Returns AString::npos on an error. */
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virtual size_t Parse(const char * a_Data, size_t a_Size) = 0;
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/** To be called when the stream is terminated from the source (connection closed).
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Flushes any buffers and calls appropriate callbacks. */
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virtual void Finish(void) = 0;
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/** Creates a new parser for the specified encoding.
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If the encoding is not known, returns a nullptr.
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a_ContentLength is the length of the content, received in a Content-Length header.
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It is used for the Identity encoding, it is ignored for the Chunked encoding. */
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static cTransferEncodingParserPtr Create(
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cCallbacks & a_Callbacks,
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const AString & a_TransferEncoding,
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size_t a_ContentLength
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);
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protected:
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/** The callbacks used to report progress. */
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cCallbacks & m_Callbacks;
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cTransferEncodingParser(cCallbacks & a_Callbacks):
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m_Callbacks(a_Callbacks)
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{
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}
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};
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