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/* Framer.h
* * Copyright (c) 1994-1995 by DataBeam Corporation, Lexington, KY * * Abstract: * This is the packet frame base class. This class defines the behavior * for other packet framers that inherit from this class. Some packet * framing definitions can be found in RFC1006 and Q.922 * * Caveats: * * Authors: * James W. Lawwill */
#ifndef _PACKET_FRAME_H_
#define _PACKET_FRAME_H_
typedef enum{ PACKET_FRAME_NO_ERROR, PACKET_FRAME_DEST_BUFFER_TOO_SMALL, PACKET_FRAME_PACKET_DECODED, PACKET_FRAME_ILLEGAL_FLAG_FOUND, PACKET_FRAME_FATAL_ERROR} PacketFrameError;
class PacketFrame{public:
virtual PacketFrameError PacketEncode ( PUChar source_address, UShort source_length, PUChar dest_address, UShort dest_length, DBBoolean prepend_flag, DBBoolean append_flag, PUShort packet_size) = 0; virtual PacketFrameError PacketDecode ( PUChar source_address, UShort source_length, PUChar dest_address, UShort dest_length, PUShort bytes_accepted, PUShort packet_size, DBBoolean continue_packet) = 0; virtual Void GetOverhead ( UShort original_packet_size, PUShort max_packet_size) = 0;
};typedef PacketFrame * PPacketFrame;
#endif
/*
* PacketFrameError PacketFrame::PacketEncode ( * PUChar source_address, * UShort source_length, * PUChar dest_address, * UShort dest_length, * DBBoolean packet_start, * DBBoolean packet_end, * PUShort packet_size) = 0; * * Functional Description * This function receives takes the source data and encodes it. * * Formal Parameters * source_address - (i) Address of source buffer * source_length - (i) Length of source buffer * dest_address - (i) Address of destination buffer. * dest_length - (i) Length of destination buffer. * packet_start - (i) This is the beginning of a packet. * packet_end - (i) This is the end of a packet. * packet_size - (o) Size of packet after encoding * * Return Value * PACKET_FRAME_NO_ERROR - No error * PACKET_FRAME_FATAL_ERROR - Fatal error during encode * PACKET_FRAME_DEST_BUFFER_TOO_SMALL - Self-explanatory * * Side Effects * None * * Caveats * None */
/*
* PacketFrameError PacketFrame::PacketDecode ( * PUChar source_address, * UShort source_length, * PUChar dest_address, * UShort dest_length, * PUShort bytes_accepted, * PUShort packet_size, * DBBoolean continue_packet) = 0; * * Functional Description * This function takes the stream data passed in and decodes it into a * packet * * Formal Parameters * source_address - (i) Address of source buffer. If this parm is * NULL, continue using the current address. * source_length - (i) Length of source buffer * dest_address - (i) Address of destination buffer. If this address * is NULL, continue using current buffer. * dest_length - (i) Length of destination buffer. * bytes_accepted - (o) Number of bytes processed before return * packet_size - (o) Size of packet after decoding * continue_packet - (i) Restart decoding * * Return Value * PACKET_FRAME_NO_ERROR - No error * PACKET_FRAME_FATAL_ERROR - Fatal error during encode * PACKET_FRAME_DEST_BUFFER_TOO_SMALL - Self-explanatory * PACKET_FRAME_PACKET_DECODED - Self-explanatory * * Side Effects * None * * Caveats * None * */
/*
* Void PacketFrame::GetOverhead ( * UShort original_packet_size, * PUShort max_packet_size) = 0; * * Functional Description * This returns the new maximum packet size * * Formal Parameters * original_packet_size - (i) * max_packet_size - (o) new maximum packet size * * Return Value * PACKET_FRAME_NO_ERROR - No error * * Side Effects * None * * Caveats * None * */
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