crt32

win32 joke implementation

Purpose

Was bored at school today, so made this. Implements equvilents, not exactly the same functions (i/o in linux sucks)

Functions

These functions do not have the same function as the real function, and this was made around the code snippet provided.

Win32 Function	Standard Function
Sleep	sleep
GetStdHandle	Custom
AllocConsole	None
WriteConsoleA	fputs
GetProcessHeap	None
HeapAlloc	malloc
HeapFree	free
RtlSecureZeroMemory	Custom
CreateFileA	fopen
WriteFile	fwrite
ReadFile	fread
StringCbCopyA	strncpy
StringCbPrintfA	vsprintf
StringCbCatA	strncat
StringCchLengthA	strnlen
CloseHandle	fclose
FreeConsole	None

Example

The following code example functions exactly the same on linux and windows:

typedef struct tagTEST_STRUCTp {
    ULONG32 Test0;
    ULONG32 Test1;
}TEST_STRUCT, * PTEST_STRUCT;

BOOL APIENTRY WinMain(
    HINSTANCE Instance,
    HINSTANCE PrevInstance,
    PSTR CommandLine,
    ULONG32 ShowMode
) {
    HANDLE StdOut;
    PTEST_STRUCT Buffer;
    HANDLE File;
    PSTR StringBuffer0;
    PSTR StringBuffer1;
    ULONG32 Length;

    StdOut = GetStdHandle(0xFFFFFFF5);
    AllocConsole();
    WriteConsoleA(StdOut, (LPCVOID)"Hello\n\n", 0x7, NULL, NULL);

    Buffer = (PTEST_STRUCT)HeapAlloc(GetProcessHeap(), 0, 0x8);
    StringBuffer0 = (LPSTR)HeapAlloc(GetProcessHeap(), 0, 0x122);
    StringBuffer1 = (LPSTR)HeapAlloc(GetProcessHeap(), 0, 0x122);

    if (!Buffer)
        return 0;

    RtlSecureZeroMemory(Buffer, 0x8);

    Buffer->Test0 = 0xA42069B;
    Buffer->Test1 = 0xC69420D;

    File = CreateFileA("Test.dat", GENERIC_WRITE, 0x0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

    WriteFile(File, Buffer, 0x8, &Length, NULL);

    RtlSecureZeroMemory(Buffer, 0x8);


    CloseHandle(File);
    File = CreateFileA("Test.dat", GENERIC_READ, 0x0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

    if (!ReadFile(File, Buffer, 0x8, NULL, NULL))
        return FALSE;

    StringCbCopyA(StringBuffer0, 0x122, "Test.dat:Test0 = ");
    StringCbPrintfA(StringBuffer1, 0x122, "0x%x", Buffer->Test0);
    StringCbCatA(StringBuffer0, 0x122, StringBuffer1);

    StringCbCatA(StringBuffer0, 0x122, "\nTest.dat:Test1 = ");
    StringCbPrintfA(StringBuffer1, 0x122, "0x%x\n", Buffer->Test1);
    StringCbCatA(StringBuffer0, 0x122, StringBuffer1);

    if (FAILED(StringCchLengthA(StringBuffer0, 0x122, &Length)))
        return FALSE;

    WriteConsoleA(StdOut, StringBuffer0, Length, NULL, NULL);
    Sleep(1000);

    FreeConsole();

    HeapFree(GetProcessHeap(), NULL, Buffer);
    HeapFree(GetProcessHeap(), NULL, StringBuffer0);
    HeapFree(GetProcessHeap(), NULL, StringBuffer1);

    return TRUE;
}
}