/*********************************************************** crypt.c -- 暗号 ***********************************************************/ #N88BASIC 'Declare Sub srand CDECL Lib"msvcrt" (seed As DWord) 'Declare Function rand CDECL Lib"msvcrt" () As DWord
Dim c As Long, r As Long Dim infile As HANDLE, outfile As HANDLE Dim re As Long infile = CreateFile("in.txt", GENERIC_READ, 0, ByVal 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0) outfile = CreateFile("out.txt", GENERIC_WRITE, 0, ByVal 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0)
Dim tane As Long
Input "乱数の種", tane srand(tane)
Do c = ReadFile(infile, c, 1, VarPtr(re), ByVal 0) If c = 0 Then Exit Do Do r = rand() / (32768 / 256) Loop while r >= 256 WriteFile(outfile, c Xor r, 1, VarPtr(re), ByVal 0) Loop
