452 lines
8.5 KiB
NASM
452 lines
8.5 KiB
NASM
page ,132
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title ACMSTUB.ASM
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;* *
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;* MODULE : ACMSTUB.ASM *
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;* *
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;* DESCRIPTION : Provide functions to allow run-time linking to *
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;* the ACM. *
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;* *
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;* COPYRIGHT : Copyright 1991, Microsoft Corp. All Rights Reserved.*
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;* *
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;* Author: David Maymudes *
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;* Based on similar code for MMSYSTEM by: *
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;* Todd Laney and Matt Saettler - Multimedia Systems *
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;* *
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; Documentation (such as it is)
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; Call function as you normally would. Include MSACM.H normally.
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; However, instead of linking to MSACM.LIB, link to ACMSTUB.OBJ
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; All functions will return error conditions if MSACM.DLL is not present.
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; Because I'm lazy, the calling routine has to load the module into
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; memory before calling any of this.
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page
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.286
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?PLM=1 ; PASCAL Calling convention is DEFAULT
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?WIN=0 ; Windows calling convention
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.xlist
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include cmacros.inc
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.list
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; CONSTANT DECLARATIONS
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ifndef FALSE
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FALSE equ 0
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endif
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ifndef NULL
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NULL equ 0
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endif
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ifndef MMSYSERR_ERROR
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MMSYSERR_ERROR equ 1
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endif
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; EXTERN DECLARATIONS
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externFP OutputDebugString
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externFP _wsprintf
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externFP GetProcAddress
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externFP GetModuleHandle
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;ifdef DEBUG
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; externFP __dprintf ; in DPRINTF.C
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;endif
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; STRUCTURE DECLARATIONS
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LONG struc
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lo dw ?
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hi dw ?
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LONG ends
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FARPOINTER struc
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off dw ?
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sel dw ?
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FARPOINTER ends
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PROCENTRY struc
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curproc dd ? ; see parameters to macros, below
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ordinal dw ?
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numparms dw ?
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errret dd ?
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ifdef DEBUG
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szProc db ?
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endif
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PROCENTRY ends
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MODENTRY struc
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hModule dw ?
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szModule db ?
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MODENTRY ends
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; DATA SEGMENT DECLARATIONS
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ifndef SEGNAME
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SEGNAME equ <_TEXT>
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endif
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createSeg %SEGNAME, CodeSeg, word, public, CODE
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page
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; MACRO DECLARATIONS
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; MACRO DOUT
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; Parms:
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; text Text to output using OutputDebugString when DEBUG is defined
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; Text is automatically appended with CR/LF
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DOUT macro text
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local string_buffer
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ifdef DEBUG ; only do output if DEBUG is defined
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_DATA segment
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string_buffer label byte
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db "&text&",13,10,0
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_DATA ends
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pusha
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push DataBASE
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push DataOFFSET string_buffer
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call OutputDebugString
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popa
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endif
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endm
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; MACRO Begin_Module_Table
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; Parms:
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; Module_Name Name of Module to Run-Time-Link
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; defines <Module_Name>_Proc Macro
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; Use End_Module_Table to close
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Begin_Module_Table MACRO Module_Name
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sBegin DATA
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ifdef DEBUG
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public Module_Name&_Module_Table
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endif
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Module_Name&_Module_Table label word
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dw -1 ; hModule
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db "&Module_Name&",0
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sEnd Data
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sBegin CodeSeg
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assumes cs,CodeSeg
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assumes ds,Data
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assumes es,nothing
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ifdef DEBUG ; make public so debugger is aware of it
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public load&Module_Name
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endif
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; entry:
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; DS:BX --> ProcEntry for API being called
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load&Module_Name& proc far
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; stack frame is not modified or copied
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; vars are still in place
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mov ax,DataOFFSET Module_Name&_Module_Table
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jmp LoadModuleStub
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load&Module_Name& endp
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sEnd CodeSeg
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page
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; MACRO <Module_Name>_Proc
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; Parms:
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; Name of procedure Name of procedure to emulate
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; ordinal of exported proc
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; # of stack parms use 0 for CDECL routines
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; error return value default error value for use by FailAPIStub
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; fail proc defaults to FailAPIStub if not specified
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; use custom 'fail' proc to replace functionlity
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; if specified module/proc not found in system
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Module_Name&_Proc macro ProcName, Ordinal, sizestack, errret, failproc
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sBegin Data
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ifdef DEBUG
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public Module_Name&&Ordinal&
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endif
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Module_Name&&Ordinal& label word
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ifb <failproc>
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dd load&Module_Name
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dw &Ordinal
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dw &sizestack
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dd &errret
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else
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dd load&Module_Name
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dw &Ordinal
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dw -1
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dd &failproc
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endif
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ifdef DEBUG
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db "&ProcName&",0
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endif
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sEnd Data
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sBegin CodeSeg
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assumes cs,CodeSeg
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assumes ds,Data
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assumes es,nothing
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public &ProcName&
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&ProcName& proc far
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; stack frame is not modified or copied
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; vars are still in place
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mov bx,DataOFFSET Module_Name&&Ordinal&
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jmp [bx].curproc ; current proc
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&ProcName& endp
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sEnd CodeSeg
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endm
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endm
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page
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; MACRO End_Module_Table
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; Parms
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; Module_Name Must be the same as in Begin_Module_Table
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End_Module_Table macro Module_Name
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purge Module_Name&_Proc
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endm
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; Helper routines for SHELL
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sBegin CodeSeg
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assumes cs,CodeSeg
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assumes ds,Data
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assumes es,nothing
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; FailApiStub
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; Default handler if Module or Proc Address is not found.
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; returns default error code
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; entry:
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; DS:BX --> PROCENTRY
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FailApiStub proc far
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pop dx ; get return addr
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pop ax
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add sp,[bx].numparms ; remove params from stack
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push ax ; restore return addr
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push dx
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mov ax,[bx].errret.lo ; return fail code
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mov dx,[bx].errret.hi
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retf
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FailApiStub endp
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; LoadModuleStub
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; Initial handler for all procs. Attempts to load module (if not already
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; loaded) and then gets proc address. If any errors, sets curproc to
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; failproc for 'unavailable' processing.
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; If successful, then sets curproc to imported function and calls it.
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; entry:
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; DS:BX --> PROCENTRY
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; DS:AX --> MODENTRY
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; NOTE: Assumes module is already loaded
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; To be totally general:
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; if can't GetModuleHandle(),
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; needs to do a OpenFile(OF_EXIST,...) + LoadLibrary()
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; needs to FreeLibrary() all DLLs at end/exit
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LoadModuleStub proc far
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ifdef DEBUG
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pusha
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sub sp,128
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mov si,sp
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mov di,ax ; DS:DI --> MODENTRY
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push [bx].ordinal ; %d
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lea ax,[bx].szProc ; %ls
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push ds
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push ax
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lea ax,[di].szModule ; %ls
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push ds
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push ax
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lea ax,format_string ; format string
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push cs
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push ax
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push ss ; buffer
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push si
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call _wsprintf
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add sp,9*2 ; clear 9 words
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cCall OutputDebugString,<ss,si>
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add sp,128
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popa
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jmp @f
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format_string:
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db "Linking %ls!%ls@%d",13,10,0
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@@:
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endif
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pusha
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mov si,ax ; ds:[si] --> MODENTRY
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mov di,bx ; ds:[di] --> PROCENTRY
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mov ax,[si].hModule
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or ax,ax
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jz LoadModuleStubFail ; module does not exist
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cmp ax,-1
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jne LoadModuleStubGetProc
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lea ax,[si].szModule
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cCall GetModuleHandle, <ds,ax>
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mov [si].hModule,ax
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or ax,ax
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jz LoadModuleStubLoad
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LoadModuleStubGetProc:
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cCall GetProcAddress,<ax,0,[di].ordinal>
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or dx,dx
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jz LoadModuleStubFail
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LoadModuleStubDone:
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mov [di].curproc.lo,ax
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mov [di].curproc.hi,dx
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popa
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jmp [bx].curproc
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LoadModuleStubLoad:
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;; call load library here after verifying with OpenFile()
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; for now, fall through to error
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LoadModuleStubFail:
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DOUT <*** API not found! ***>
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mov ax,CodeSegOFFSET FailApiStub
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mov dx,cs
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cmp [di].numparms,-1 ; do we have a fail proc?
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jne LoadModuleStubDone ; no...use FailApiStub
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mov ax,[di].errret.lo ; yes..it is stored in errret
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mov dx,[di].errret.hi
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jmp short LoadModuleStubDone ; use it
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LoadModuleStub endp
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sEnd CodeSeg
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page
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; CODE and DATA
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; Define SHELL Run-Time-Load Table
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Begin_Module_Table MSACM
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MSACM_Proc acmGetVersion 7, 0, 0
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MSACM_Proc acmFormatChoose 40, 4, MMSYSERR_ERROR
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MSACM_Proc acmMetrics 8, 8, MMSYSERR_ERROR
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; end the MSACM R-T-L table
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End_Module_Table MSACM
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; STUB ROUTINES
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; no stub routines for MSACM.
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end
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