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223 lines
5.4 KiB
223 lines
5.4 KiB
;-----------------------------------------------------------------------;
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; CVT.INC
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;
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; This module contains macros that generate 16-bit code to convert
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; structures in either direction between 16-bit and 32-bit definitions.
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;
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; USE THIS EVERYWHERE! USE THESE IN PACKING MACROS! THESE ARE AS
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; SMALL AND FAST AS INLINE IS EVER GOING TO BE. DO NOT WRITE YOUR OWN.
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;-----------------------------------------------------------------------;
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;-----------------------------------------------------------------------;
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; srcadj
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; adj amount by which to adjust source pointer (DS:ESI)
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;-----------------------------------------------------------------------;
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srcadj macro adj
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ifnb <adj>
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add esi,adj
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endif
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endm
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;-----------------------------------------------------------------------;
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; dstadj
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; adj amount by which to adjust destination pointer (ES:EDI)
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;-----------------------------------------------------------------------;
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dstadj macro adj
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ifnb <adj>
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add edi,adj
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endif
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endm
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;-----------------------------------------------------------------------;
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; copyw -- Copy a word
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;-----------------------------------------------------------------------;
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copyw macro adj
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srcadj adj
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movsw es:[edi],ds:[esi]
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endm
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;-----------------------------------------------------------------------;
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; ncopyw -- Copy N words
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;-----------------------------------------------------------------------;
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ncopyw macro count:req
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mov ecx, count
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rep movsw es:[edi], ds:[esi]
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endm
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;-----------------------------------------------------------------------;
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; copyd -- Copy a dword
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;-----------------------------------------------------------------------;
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copyd macro adj
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srcadj adj
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movsd es:[edi],ds:[esi]
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endm
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;-----------------------------------------------------------------------;
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; ncopyd -- Copy N dwords
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;-----------------------------------------------------------------------;
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ncopyd macro count:req
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mov ecx, count
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rep movsd es:[edi],ds:[esi]
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endm
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;-----------------------------------------------------------------------;
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; copysx -- Sign-extend an INT to a LONG
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;-----------------------------------------------------------------------;
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copysx macro adj
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srcadj adj
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lodsw ds:[si]
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cwde
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stosd es:[edi]
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endm
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;------------------------------------------------------------------------;
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; ncopysx - Sign-extend N INTs to LONGs
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;------------------------------------------------------------------------;
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ncopysx macro count:req, adj
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local m1
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mov cx, count
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m1:
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copysx adj
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loop m1
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endm
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;-----------------------------------------------------------------------;
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; copysx2 -- Copy and sign-extend a word to a dword, mapping 8000h
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; to 80000000h.
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;-----------------------------------------------------------------------;
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copysx2 macro adj
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local sign_extend_it
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local store_it
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srcadj adj
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lodsw ds:[si]
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cmp ax,8000h
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jne sign_extend_it
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ror eax,16
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sub ax,ax
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jmp short store_it
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sign_extend_it:
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cwde
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store_it:
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stosd es:[edi]
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endm
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;-----------------------------------------------------------------------;
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; ncopysx2
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;-----------------------------------------------------------------------;
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ncopysx2 macro count:req, adj
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local m1
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mov cx, count
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m1:
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copysx2 adj
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loop m1
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endm
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;-----------------------------------------------------------------------;
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; copyzx -- Copy and zero-extend a word to a dword
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;-----------------------------------------------------------------------;
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copyzx macro adj
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srcadj adj
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lodsw ds:[si]
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movzx eax,ax
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stosd es:[edi]
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endm
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;-----------------------------------------------------------------------;
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; ncopyzx -- Zero-extend N WORDs to DWORDs
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;-----------------------------------------------------------------------;
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ncopyzx macro count:req
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local m1
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xor eax, eax
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mov cx, count
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m1:
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lodsw ds:[si]
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stosd es:[edi]
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loop m1
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endm
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;-----------------------------------------------------------------------;
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; copyt -- Copy and truncate a dword to a word
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;-----------------------------------------------------------------------;
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copyt macro adj
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srcadj adj
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lodsd ds:[esi]
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stosw es:[di]
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endm
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;-----------------------------------------------------------------------;
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; ncopyt -- Truncate N DWORDs to WORDs
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;-----------------------------------------------------------------------;
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ncopyt macro count:req
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local m1
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mov cx, count
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m1:
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lodsd ds:[esi]
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stosw es:[di]
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loop m1
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endm
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;-----------------------------------------------------------------------;
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; copyt2 -- Copy and truncate a dword to a word, mapping 80000000
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; to 8000.
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;-----------------------------------------------------------------------;
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copyt2 macro adj
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local store_it
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srcadj adj
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lodsd ds:[esi] ;get dword value
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cmp eax,80000000h ;is just the high bit set?
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jne store_it ;if not, just truncate
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ror eax,16 ;if yes, store 8000h
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store_it:
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stosw es:[di]
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endm
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;-----------------------------------------------------------------------;
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; ncopyt2 -- Truncate N special DWORDs to WORDs
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;-----------------------------------------------------------------------;
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ncopyt2 macro count:req, adj
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local m1
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mov cx, count
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m1:
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copyt2 adj
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loop m1
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endm
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