NSIS code was never designed to be fast and any call to a Int* function involves at least 2 string to number conversions etc.
Using a slightly slower version of the function you can prevent other processes from opening the file for writing:
Function AdvReplaceInFile
Exch $0 ;file to replace in
Exch
Exch $1 ;number to replace after
Exch
Exch 2
Exch $2 ;replace and onwards
Exch 2
Exch 3
Exch $3 ;replace with
Exch 3
Exch 4
Exch $4 ;to replace
Exch 4
Push $5 ;minus count
Push $6 ;universal
Push $7 ;end string
Push $8 ;left string
Push $9 ;right string
Push $R0 ;file1
Push $R1 ;file2
Push $R2 ;read
Push $R3 ;universal
Push $R4 ;count (onwards)
Push $R5 ;count (after)
Push $R6 ;temp file name
GetTempFileName $R6
FileOpen $R1 $0 a ;file to search in
FileOpen $R0 $R6 a ;temp file
StrLen $R3 $4
StrCpy $R4 -1
StrCpy $R5 -1
loop_read:
ClearErrors
FileRead $R1 $R2 ;read line
IfErrors exit
StrCpy $5 0
StrCpy $7 $R2
loop_filter:
IntOp $5 $5 - 1
StrCpy $6 $7 $R3 $5 ;search
StrCmp $6 "" file_write1
StrCmp $6 $4 0 loop_filter
StrCpy $8 $7 $5 ;left part
IntOp $6 $5 + $R3
IntCmp $6 0 is0 not0
is0:
StrCpy $9 ""
Goto done
not0:
StrCpy $9 $7 "" $6 ;right part
done:
StrCpy $7 $8$3$9 ;re-join
IntOp $R4 $R4 + 1
StrCmp $2 all loop_filter
StrCmp $R4 $2 0 file_write2
IntOp $R4 $R4 - 1
IntOp $R5 $R5 + 1
StrCmp $1 all loop_filter
StrCmp $R5 $1 0 file_write1
IntOp $R5 $R5 - 1
Goto file_write2
file_write1:
FileWrite $R0 $7 ;write modified line
Goto loop_read
file_write2:
FileWrite $R0 $R2 ;write unmodified line
Goto loop_read
exit:
FileSeek $R1 0 SET
!if "${NSIS_PTR_SIZE}" > 4
System::Call 'kernel32::SetEndOfFile(p$R1)'
!else
System::Call 'kernel32::SetEndOfFile(i$R1)'
!endif
FileSeek $R0 0 SET
ClearErrors
mov_loop:
FileRead $R0 $R2
IfErrors mov_done
FileWrite $R1 $R2
Goto mov_loop
mov_done:
FileClose $R0
FileClose $R1
SetDetailsPrint none
Delete $R6
SetDetailsPrint lastused
Pop $R6
Pop $R5
Pop $R4
Pop $R3
Pop $R2
Pop $R1
Pop $R0
Pop $9
Pop $8
Pop $7
Pop $6
Pop $5
;These values are stored in the stack in the reverse order they were pushed
Pop $0
Pop $1
Pop $2
Pop $3
Pop $4
FunctionEnd
The only way to actually make it faster would be to call a external program or write a plugin...