DIRECTORY Basics USING [bytesPerFWord, bytesPerHWord, FWORD, HWORD], CommBuffer USING [Overhead], XNSBuf USING[Hdr, maxBodyBytes], XNSExchangeTypes USING [ExchangeID, ExchangeType]; XNSExchangeBuf: CEDAR DEFINITIONS ~ BEGIN HWORD: TYPE ~ Basics.HWORD; FWORD: TYPE ~ Basics.FWORD; maxBytes: CARDINAL ~ XNSBuf.maxBodyBytes; Hdr: TYPE ~ MACHINE DEPENDENT RECORD [ id: XNSExchangeTypes.ExchangeID, type: XNSExchangeTypes.ExchangeType]; hdrBytes: CARDINAL ~ BITS[Hdr]/BITS[BYTE]; Body: TYPE ~ MACHINE DEPENDENT RECORD [ SELECT OVERLAID * FROM bytes => [bytes: PACKED ARRAY [0..maxBodyBytes) OF BYTE], chars => [chars: PACKED ARRAY [0..maxBodyChars) OF CHAR], hWords => [hWords: PACKED ARRAY [0..maxBodyHWords) OF HWORD], fWords => [fWords: PACKED ARRAY [0..maxBodyFWords) OF FWORD] ENDCASE ]; maxBodyBytes: CARDINAL ~ maxBytes - hdrBytes; maxBodyChars: CARDINAL ~ maxBodyBytes; maxBodyHWords: CARDINAL ~ maxBodyBytes/Basics.bytesPerHWord; maxBodyFWords: CARDINAL ~ maxBodyBytes/Basics.bytesPerFWord; Packet: TYPE ~ REF PacketObject; PacketObject: TYPE ~ MACHINE DEPENDENT RECORD [ hdr: Hdr, body: Body]; Buffer: TYPE ~ REF BufferObject; BufferObject: TYPE ~ MACHINE DEPENDENT RECORD [ ovh: CommBuffer.Overhead, hdr1: XNSBuf.Hdr, hdr2: Hdr, body: Body]; END. δXNSExchangeBuf.mesa Copyright c 1986 by Xerox Corporation. All rights reserved. Demers, December 19, 1986 8:39:37 pm PST Packet format for XNS Level 2 Packet Exchange Protocol per XSIS 028112, December 1981. Header Body Packet Buffer All buffers are actually Driver.Buffer's that have been SmashType'd to XNSBuf.Buffer's. Clients may LOOPHOLE between XNSBuf.Buffer and XNSExchangeBuf.Buffer, but should never NEW one of these and should NARROW one only to XNSBuf.Buffer. Κ„˜codešœ™Kšœ Οmœ1™