C
C	BBC Microcomputer emulation package
C	BBC_FILES.INC - file system structure definitions and includes
C
C	Copyright Peter Coghlan 1998
C

C	Include files needed for structure definitions

	Include '($Fabdef)'
	Include '($Rabdef)'
C
C	Constants
C
	Parameter Max_Files = 5

	Parameter BlockSize = 512
C
C	Structure definitions
C
C	File control block
C
	Structure /BbcFcbDef/

	  Integer *4 Flags				! Flags - see below.

	  Integer *4 Load				! Bbc Load address.
	  Integer *4 Exec				! Bbc Execution address.
	  Integer *4 Size				! File size in bytes.
	  Integer *4 Attrs				! Bbc file attributes.

	  Record /Fabdef/ Fab

	  Record /Rabdef/ Rab

	End Structure
C
C	Control block for random access files
C
	Structure /RaFileDef/

	  Integer Flags

	  Integer Block
	  Integer Ptr
	  Integer Ext

	  Character *512 Buffer

	End Structure
C
C	Structures to separate and combine bytes from/to words and longwords
C
	Structure /FourBytes/
	  Union
	    Map
	      Integer *1 Byte0
	      Integer *1 Byte1
	      Integer *1 Byte2
	      Integer *1 Byte3
	    EndMap
	    Map
	      Integer *4 All
	    EndMap
	  EndUnion
	EndStructure

	Structure /TwoBytes/

	  Integer *1 Byte0
	  Integer *1 Byte1

	End Structure

C	Flags in BbcFcbDef

	Parameter Bbc_M_Block = '00000001'X		! Block mode can
	Parameter Bbc_V_Block = '00000000'X		! be used.
	Parameter Bbc_M_Acl   = '00000002'X		! Acl with BBC file
	Parameter Bbc_V_Acl   = '00000001'X		! attributes present.

C	Flags in options argument passed to Bbc_Open_File and in Bbc_files

	Parameter Bbc_M_Read  = '00000001'X		! Open file with read
	Parameter Bbc_V_Read  = '00000000'X		! access allowed.
	Parameter Bbc_M_Write = '00000002'X		! Open file with write
	Parameter Bbc_V_Write = '00000001'X		! access allowed.

C	Flag only used in Bbc_Open_File

	Parameter Bbc_M_New   = '00000004'X		! Create new file or
	Parameter Bbc_V_New   = '00000002'X		! new version of file.

C	Flags only used in Bbc_Files

	Parameter Bbc_M_InUse = '00000008'X		! Channel in use
	Parameter Bbc_V_InUse = '00000003'X
	Parameter Bbc_M_Eof   = '00000010'X		! Eof signalled
	Parameter Bbc_V_Eof   = '00000004'X
	Parameter Bbc_M_Mod   = '00000040'X		! Buffer modified but
	Parameter Bbc_V_Mod   = '00000006'X		! not yet written out
	Parameter Bbc_M_InMem = '00000080'X		! Segment containing
	Parameter Bbc_V_InMem = '00000007'X		! PTR loaded.

C	Function requested in Bbc_Files

	Parameter Bbc_Find    = '00000001'X		! Osfind open or close
	Parameter Bbc_Bget    = '00000002'X		! Osbget
	Parameter Bbc_Bput    = '00000003'X		! Osbput
	Parameter Bbc_Args    = '00000004'X		! Osargs
	Parameter Bbc_GbPb    = '00000005'X		! Osgbpb
	Parameter Bbc_Eof     = '00000006'X		! Check EOF