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BitFunctions.prg
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BitFunctions.prg
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//
// Copyright (c) XSharp B.V. All Rights Reserved.
// Licensed under the Apache License, Version 2.0.
// See License.txt in the project root for license information.
//
// Functions provided by Antonio Lopes
// make sure this is compiled early bound !
#pragma options ("lb", off)
#translate BETWEEN(<n1>, <n2>, <n3>) => (<n1> >= <n2> .and. <n1> <= <n3>)
#define RANGE_ERROR "Value must be between 0 and 31"
#define TYPE_ERROR "Value must be LONG or BINARY"
#define TYPE_ERROR2 "Value must be LONG"
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitand/*" />
FUNCTION BitAnd (Arg1 AS USUAL, Arg2 PARAMS USUAL[]) AS USUAL
RETURN BitHelpers._BITANDORX(BitOperation.And, Arg1, Arg2)
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitand/*" />
FUNCTION BitAnd (Arg1 AS INT, Arg2 PARAMS INT[]) AS INT
RETURN BitHelpers._BITANDORX(BitOperation.And, Arg1, Arg2)
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitand/*" />
FUNCTION BitAnd(Arg1 AS BINARY, Arg2 PARAMS BINARY[]) AS BINARY
RETURN BitHelpers._BITANDORX(BitOperation.And, Arg1, Arg2)
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitclear/*" />
FUNCTION BitClear (Arg1 AS USUAL) AS BINARY
RETURN BitClear((BINARY)Arg1)
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitclear/*" />
FUNCTION BitClear (Arg1 AS USUAL, Bit AS USUAL) AS USUAL
IF ! IsNumeric(Bit)
THROW Error.ArgumentError(__FUNCTION__, nameof(Bit),TYPE_ERROR, 2, {Bit})
ENDIF
IF IsBinary(Arg1)
VAR binValue := (BINARY) Arg1
RETURN IIF(binValue.Length == 0, 0h, BitClear(binValue, (INT)Bit, 1))
ELSEIF IsNumeric(Arg1)
RETURN BitClear((INT)Arg1, (INT)Bit)
ELSE
THROW Error.ArgumentError(__FUNCTION__, nameof(Arg1),TYPE_ERROR, 1, {Arg1})
ENDIF
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitclear/*" />
FUNCTION BitClear (Arg1 AS USUAL, Arg2 AS USUAL, Arg3 AS USUAL) AS BINARY
RETURN BitClear((BINARY)Arg1, (INT)Arg2, (INT)Arg3)
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitclear/*" />
FUNCTION BitClear (Num AS INT, Bit AS INT) AS INT
IF BETWEEN(Bit, 0, 31)
RETURN _AND(Num, _NOT(1 << Bit))
ELSE
THROW Error.ArgumentError(__FUNCTION__, nameof(Bit),RANGE_ERROR, 2,{Bit})
ENDIF
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitclear/*" />
FUNCTION BitClear (BinString AS BINARY) AS BINARY
RETURN IIF(BinString.Length == 0, 0h, BitClear(BinString, 0, BinString.Length * 8))
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitclear/*" />
FUNCTION BitClear (BinString AS BINARY, StartBit AS INT) AS BINARY
RETURN IIF(BinString.Length == 0, 0h, BitClear(BinString, StartBit, 1))
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitclear/*" />
FUNCTION BitClear (BinString AS BINARY, StartBit AS INT, BitCount AS INT) AS BINARY
LOCAL Result := BinString AS BYTE[]
LOCAL ByteIndex AS INT
LOCAL BitIndex := StartBit AS INT
LOCAL BitCounter AS INT
FOR BitCounter := 1 TO BitCount
ByteIndex := BitIndex / 8 + 1
IF BETWEEN(ByteIndex, 1, Result.Length)
Result[ByteIndex] := (BYTE) _AND(Result[ByteIndex],_NOT(1 << BitIndex % 8))
BitIndex++
ELSE
THROW Error.ArgumentError(__FUNCTION__, nameof(StartBit),2)
ENDIF
NEXT
RETURN (BINARY)Result
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitlshift/*" />
FUNCTION BitLShift (Arg AS INT, Bits AS INT) AS INT
IF BETWEEN(Bits, 0, 31)
RETURN Arg << Bits
ELSE
THROW Error.ArgumentError(__FUNCTION__, nameof(Bits),RANGE_ERROR, 2,{Bits})
ENDIF
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitlshift/*" />
FUNCTION BitLShift (Arg AS USUAL, Bits AS USUAL) AS INT
RETURN BitLShift((INT)Arg, (INT)Bits)
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitnot/*" />
FUNCTION BitNot (Arg1 AS USUAL) AS USUAL
IF IsBinary(Arg1)
RETURN BitNot((BINARY)Arg1)
ELSEIF IsNumeric(Arg1)
RETURN BitNot((INT)Arg1)
ELSE
THROW Error.ArgumentError(__FUNCTION__, nameof(Arg1),TYPE_ERROR, 1, {Arg1})
ENDIF
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitnot/*" />
FUNCTION BitNot (nNumericExpression AS INT) AS INT
RETURN ~nNumericExpression
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitnot/*" />
FUNCTION BitNot (BinString AS BINARY) AS BINARY
RETURN BitNot(BinString, 0, BinString.Length * 8)
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitnot/*" />
FUNCTION BitNot (BinString AS BINARY, StartBit AS INT, BitCount := 1 AS INT) AS BINARY
LOCAL Result := 0h + BinString AS BYTE[]
LOCAL ByteIndex AS INT
LOCAL BitIndex := StartBit AS INT
LOCAL BitCounter AS INT
FOR BitCounter := 1 TO BitCount
ByteIndex := BitIndex / 8 + 1
IF BETWEEN(ByteIndex, 1, Result.Length)
Result[ByteIndex] := (BYTE) _XOR(Result[ByteIndex], 1 << BitIndex % 8)
BitIndex++
ELSE
THROW Error.ArgumentError(__FUNCTION__, nameof(StartBit),2)
ENDIF
NEXT
RETURN (BINARY)Result
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitor/*" />
FUNCTION BitOr (Arg1 AS USUAL, Arg2 PARAMS USUAL[]) AS USUAL
RETURN BitHelpers._BITANDORX(BitOperation.Or, Arg1, Arg2)
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitor/*" />
FUNCTION BitOr (Arg1 AS INT, Arg2 PARAMS INT[]) AS INT
RETURN BitHelpers._BITANDORX(BitOperation.Or, Arg1, Arg2)
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitor/*" />
FUNCTION BitOr (Arg1 AS BINARY, Arg2 PARAMS BINARY[]) AS BINARY
RETURN BitHelpers._BITANDORX(BitOperation.Or, Arg1, Arg2)
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitrshift/*" />
FUNCTION BitRShift (Arg AS USUAL, Bits AS USUAL) AS INT
IF IsNumeric(Arg) .AND. IsNumeric(Bits)
RETURN BitRShift((INT)Arg, (INT)Bits)
ENDIF
IF ! IsNumeric(Arg)
THROW Error.ArgumentError(__FUNCTION__, nameof(Arg),TYPE_ERROR2, 1, {Arg})
ENDIF
THROW Error.ArgumentError(__FUNCTION__, nameof(Bits),TYPE_ERROR2, 2, {Bits})
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitrshift/*" />
INTERNAL FUNCTION BitRShift (Arg AS INT, Bits AS INT) AS INT
IF BETWEEN(Bits, 0, 31)
IF !BitTest(Arg, 31) .OR. Bits == 0
RETURN Arg >> Bits
ELSE
RETURN BitSet(BitClear(Arg, 31) >> Bits, 31 - Bits)
ENDIF
ELSE
THROW Error.ArgumentError(__FUNCTION__, nameof(Bits),RANGE_ERROR, 2,{Bits})
ENDIF
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitset/*" />
FUNCTION BitSet (Arg1 AS USUAL) AS BINARY
RETURN BitSet((BINARY)Arg1)
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitset/*" />
FUNCTION BitSet (Arg1 AS USUAL, Bit AS USUAL) AS USUAL
IF IsBinary(Arg1)
RETURN BitSet((BINARY)Arg1, (INT)Bit, 1)
ELSE
RETURN BitSet((INT)Arg1, (INT)Bit)
ENDIF
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitset/*" />
FUNCTION BitSet (BinString AS USUAL, StartBit AS USUAL, BitCount AS USUAL) AS BINARY
RETURN BitSet((BINARY)BinString, (INT)StartBit, (INT)BitCount)
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitset/*" />
FUNCTION BitSet (Num AS INT, Bit AS INT) AS INT
IF BETWEEN(Bit, 0, 31)
RETURN _OR(Num, 1 << Bit)
ELSE
THROW Error.ArgumentError(__FUNCTION__, nameof(Bit),RANGE_ERROR, 2,{Bit})
ENDIF
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitset/*" />
FUNCTION BitSet (BinString AS BINARY) AS BINARY
RETURN IIF(BinString.Length == 0, 0h, BitSet(BinString, 0, BinString.Length * 8))
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitset/*" />
FUNCTION BitSet (BinString AS BINARY, StartBit AS INT) AS BINARY
RETURN IIF(BinString.Length == 0, 0h, BitSet(BinString, StartBit, 1))
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitset/*" />
FUNCTION BitSet (BinString AS BINARY, StartBit AS INT, BitCount AS INT) AS BINARY
LOCAL Result := 0h + BinString AS BYTE[]
LOCAL ByteIndex AS INT
LOCAL BitIndex := StartBit AS INT
LOCAL BitCounter AS INT
FOR BitCounter := 1 TO BitCount
ByteIndex := BitIndex / 8 + 1
IF BETWEEN(ByteIndex, 1, Result.Length)
Result[ByteIndex] := (BYTE) _OR(Result[ByteIndex], 1 << BitIndex % 8)
BitIndex++
ELSE
THROW Error.ArgumentError(__FUNCTION__, nameof(StartBit),2)
ENDIF
NEXT
RETURN (BINARY)Result
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bittest/*" />
FUNCTION BitTest (Arg AS USUAL, Bit AS USUAL) AS LOGIC
IF IsBinary(Arg)
RETURN BitTest((BINARY)Arg, (INT)Bit)
ELSEIF IsLong(Arg)
RETURN BitTest((INT)Arg, (INT)Bit)
ELSE
THROW Error.ArgumentError(__FUNCTION__, nameof(Arg),TYPE_ERROR, 1, {Arg})
ENDIF
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bittest/*" />
FUNCTION BitTest (Arg AS INT, Bit AS INT) AS LOGIC
IF BETWEEN(Bit, 0, 31)
RETURN _AND(Arg, 1 << Bit) != 0
ELSE
THROW Error.ArgumentError(__FUNCTION__, nameof(Bit),RANGE_ERROR,2,{Bit})
ENDIF
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bittest/*" />
FUNCTION BitTest (BinString AS BINARY, BitNumber AS INT) AS LOGIC
LOCAL Buff := BinString AS BYTE[]
IF BETWEEN(BitNumber, 0, Buff.Length * 8 - 1)
RETURN _AND(Buff[BitNumber / 8 + 1], 1 << BitNumber % 8) != 0
ELSE
THROW Error.ArgumentError(__FUNCTION__, nameof(BitNumber),2)
ENDIF
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitxor/*" />
FUNCTION BitXor (Arg1 AS USUAL, Arg2 PARAMS USUAL[]) AS USUAL
RETURN BitHelpers._BITANDORX(BitOperation.Xor, Arg1, Arg2)
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitxor/*" />
FUNCTION BitXor (Arg1 AS INT, Arg2 PARAMS INT[]) AS INT
RETURN BitHelpers._BITANDORX(BitOperation.Xor, Arg1, Arg2)
END FUNC
/// <include file="VFPDocs.xml" path="Runtimefunctions/bitxor/*" />
FUNCTION BitXor (Arg1 AS BINARY, Arg2 PARAMS BINARY[]) AS BINARY
RETURN BitHelpers._BITANDORX(BitOperation.Xor, Arg1, Arg2)
END FUNC
INTERNAL STATIC CLASS BitHelpers
STATIC METHOD _BITANDORX (LogicalOp AS BitOperation, Arg1 AS USUAL, Arg2 PARAMS USUAL[]) AS USUAL
IF IsBinary(Arg1)
VAR Args = BINARY[]{Arg2.Length}
LOCAL ArgIndex AS INT
FOR ArgIndex := 1 TO Args.Length
Args[ArgIndex] := (BINARY)Arg2[ArgIndex]
NEXT
RETURN _BITANDORX(LogicalOp, (BINARY)Arg1, Args)
ELSEIF IsLong(Arg1)
VAR Args = INT[]{Arg2.Length}
LOCAL ArgIndex AS INT
FOR ArgIndex := 1 TO Args.Length
Args[ArgIndex] := (INT)Arg2[ArgIndex]
NEXT
RETURN _BITANDORX(LogicalOp, (INT)Arg1, Args)
ELSE
THROW Error.ArgumentError(__FUNCTION__, nameof(Arg1),TYPE_ERROR,1, {Arg1})
ENDIF
END METHOD
STATIC METHOD _BITANDORX (LogicalOp AS BitOperation, Arg1 AS INT, Arg2 PARAMS INT[]) AS INT
LOCAL Result := Arg1 AS INT
LOCAL ArgIndex AS INT
SWITCH LogicalOp
CASE BitOperation.And
FOR ArgIndex := 1 TO Arg2.Length
Result := _AND(Result, Arg2[ArgIndex])
NEXT
CASE BitOperation.Or
FOR ArgIndex := 1 TO Arg2.Length
Result := _OR(Result, Arg2[ArgIndex])
NEXT
CASE BitOperation.Xor
FOR ArgIndex := 1 TO Arg2.Length
Result := _XOR(Result, Arg2[ArgIndex])
NEXT
END
RETURN Result
END METHOD
STATIC METHOD _BITANDORX (LogicalOp AS BitOperation, Arg1 AS BINARY, Arg2 PARAMS BINARY[]) AS BINARY
LOCAL Result := 0h + Arg1 AS BYTE[]
LOCAL ArgIndex AS INT
FOR ArgIndex := 1 TO Arg2.Length
LOCAL Arg := 0h + Arg2[ArgIndex] AS BYTE[]
IF Result.Length < Arg.Length
Array.Resize(REF Result, Arg.Length)
ELSE
IF Result.Length > Arg.Length
Array.Resize(REF Arg, Result.Length)
ENDIF
ENDIF
LOCAL ByteIndex AS INT
SWITCH LogicalOp
CASE BitOperation.And
FOR ByteIndex := 1 TO Result.Length
Result[ByteIndex] := _AND(Result[ByteIndex], Arg[ByteIndex])
NEXT
CASE BitOperation.Or
FOR ByteIndex := 1 TO Result.Length
Result[ByteIndex] := _OR(Result[ByteIndex], Arg[ByteIndex])
NEXT
CASE BitOperation.Xor
FOR ByteIndex := 1 TO Result.Length
Result[ByteIndex] := _XOR(Result[ByteIndex], Arg[ByteIndex])
NEXT
END
NEXT
RETURN (BINARY)Result
END METHOD
END CLASS
INTERNAL ENUM BitOperation
MEMBER And
MEMBER Or
MEMBER Xor
END ENUM