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