Message segmenter that chops incoming byte stream into gridconnect packets. More...

Inheritance diagram for DirectHubGcSegmenter:

Public Member Functions
ssize_t	segment_message (const void *d, size_t size) override
	Makes a segmenting decision given more input data.

void	clear () override
	Resets internal state machine.

Private Attributes
uint32_t	isGcPacket_: 1
	True if the current packet is a gridconnect packet; false if it is garbage.

uint32_t	packetLen_: 30
	How many bytes long this packet is.

Detailed Description

Message segmenter that chops incoming byte stream into gridconnect packets.

Definition at line 38 of file DirectHubGc.cxx.

Constructor & Destructor Documentation

◆ DirectHubGcSegmenter()

DirectHubGcSegmenter::DirectHubGcSegmenter ( )

inline

Definition at line 41 of file DirectHubGc.cxx.

Member Function Documentation

◆ clear()

void DirectHubGcSegmenter::clear ( )

inlineoverridevirtual

Resets internal state machine.

The next call to segment_message() assumes no previous data present.

Implements MessageSegmenter.

Definition at line 107 of file DirectHubGc.cxx.

◆ segment_message()

ssize_t DirectHubGcSegmenter::segment_message	(	const void *	data,
		size_t	size
	)

inlineoverridevirtual

Makes a segmenting decision given more input data.

This function will be called by the input routine repeatedly with the additional payload (non-overlapping) until the function returns a non-zero response.

That response tells how many bytes long the last packet was, which must be <= the sum of the size arguments passed in. Thereafter the read flow will call clear() and call segment_message() again with the remaining partial buffer.

Parameters

data	beginning of the buffer pointing to the next unsegmented data array.
size	how many bytes of data are available at this address. Must be >0.

Returns: 0 if no complete packet was yet seen; positive value N if the packet that starts in the first segment_message call is N bytes long. Negative return are reserved (shall not be returned at this point).

Implements MessageSegmenter.

Definition at line 46 of file DirectHubGc.cxx.

Member Data Documentation

◆ isGcPacket_

uint32_t DirectHubGcSegmenter::isGcPacket_

private

True if the current packet is a gridconnect packet; false if it is garbage.

Definition at line 116 of file DirectHubGc.cxx.

◆ packetLen_

uint32_t DirectHubGcSegmenter::packetLen_

private

How many bytes long this packet is.

Definition at line 119 of file DirectHubGc.cxx.

The documentation for this class was generated from the following file:

DirectHubGc.cxx

Public Member Functions

Private Attributes