ntrtl.h

#include "ntapi.h"

// Hacky case manipulation macros.

#define RTL_UPCASE(wch) (                                                       \
    ((wch) < 'a' ?                                                              \
        (wch)                                                                   \
    :                                                                           \
        ((wch) <= 'z' ?                                                         \
            (wch) - ('a'-'A')                                                   \
        :                                                                       \
            ((WCHAR)(wch))                                                      \
        )                                                                       \
    )                                                                           \
)

#define RTL_DOWNCASE(wch) (                                                     \
    ((wch) < 'A' ?                                                              \
        (wch)                                                                   \
    :                                                                           \
        ((wch) <= 'Z' ?                                                         \
            (wch) + ('a'-'A')                                                   \
        :                                                                       \
            ((WCHAR)(wch))                                                      \
        )                                                                       \
    )                                                                           \
)

//NTSYSAPI
LONG
NTAPI
RtlCompareUnicodeStrings(
    IN CONST WCHAR* String1,
    IN SIZE_T Length1,
    IN CONST WCHAR* String2,
    IN SIZE_T Length2,
    IN BOOLEAN CaseInSensitive
    );

#if !defined(_NTDDK_)

FORCEINLINE
LONG
NTAPI
RtlCompareUnicodeString(
    IN PCUNICODE_STRING String1,
    IN PCUNICODE_STRING String2,
    IN BOOLEAN CaseInSensitive
)
{
    return RtlCompareUnicodeStrings(String1->Buffer, String1->Length,
                                    String2->Buffer, String2->Length,
                                    CaseInSensitive);
}

_At_(DestinationString->Buffer, _Post_equal_to_(SourceString))
_At_(DestinationString->Length, _Post_equal_to_(_String_length_(SourceString) * sizeof(WCHAR)))
_At_(DestinationString->MaximumLength, _Post_equal_to_((_String_length_(SourceString)+1) * sizeof(WCHAR)))
//NTSYSAPI
VOID
NTAPI
RtlInitUnicodeString(
    _Out_ PUNICODE_STRING DestinationString,
    _In_opt_z_ PCWSTR SourceString
    );

_At_(UnicodeString->Buffer, _Post_equal_to_(Buffer))
_At_(UnicodeString->Length, _Post_equal_to_(0))
_At_(UnicodeString->MaximumLength, _Post_equal_to_(BufferSize))
FORCEINLINE
VOID
RtlInitEmptyUnicodeString(
    OUT PUNICODE_STRING UnicodeString,
    IN _Writable_bytes_(BufferSize) _When_(BufferSize != 0, _Notnull_)
    PWCHAR Buffer,
    IN UINT16 BufferSize
)
{
    memset(UnicodeString, 0, sizeof(*UnicodeString));
    UnicodeString->MaximumLength = BufferSize;
    UnicodeString->Buffer = Buffer;
}

_At_(AnsiString->Buffer, _Post_equal_to_(Buffer))
_At_(AnsiString->Length, _Post_equal_to_(0))
_At_(AnsiString->MaximumLength, _Post_equal_to_(BufferSize))
FORCEINLINE
VOID
RtlInitEmptyAnsiString(
    OUT PANSI_STRING AnsiString,
    IN _Pre_readable_size_(BufferSize) CHAR* Buffer,
    IN UINT16 BufferSize
)
{
    AnsiString->Length = 0;
    AnsiString->MaximumLength = BufferSize;
    AnsiString->Buffer = Buffer;
}

#endif // !_NTDDK_