/*
 * PROJECT:         ReactOS win32k.sys
 * FILE:            subsystems/win32/win32k/misc/rtlstr.c
 * PURPOSE:         Large Strings
 * PROGRAMMER:
 *
 */

/* INCLUDES ******************************************************************/

#include <win32k.h>

/* FUNCTIONS *****************************************************************/

VOID
NTAPI
RtlInitLargeAnsiString(
    IN OUT PLARGE_ANSI_STRING DestinationString,
    IN PCSZ SourceString,
    IN INT Unknown)
{
    ULONG DestSize;

    if (SourceString)
    {
        DestSize = strlen(SourceString);
        DestinationString->Length = DestSize;
        DestinationString->MaximumLength = DestSize + sizeof(CHAR);
    }
    else
    {
        DestinationString->Length = 0;
        DestinationString->MaximumLength = 0;
    }

    DestinationString->Buffer = (PCHAR)SourceString;
    DestinationString->bAnsi  = TRUE;
}

VOID
NTAPI
RtlInitLargeUnicodeString(
    IN OUT PLARGE_UNICODE_STRING DestinationString,
    IN PCWSTR SourceString,
    IN INT Unknown)
{
    ULONG DestSize;

    if (SourceString)
    {
        DestSize = wcslen(SourceString) * sizeof(WCHAR);
        DestinationString->Length = DestSize;
        DestinationString->MaximumLength = DestSize + sizeof(WCHAR);
    }
    else
    {
        DestinationString->Length = 0;
        DestinationString->MaximumLength = 0;
    }

    DestinationString->Buffer = (PWSTR)SourceString;
    DestinationString->bAnsi  = FALSE;
}

BOOL
NTAPI
RtlLargeStringToUnicodeString(
    PUNICODE_STRING DestinationString,
    PLARGE_STRING SourceString)
{
    ANSI_STRING AnsiString;

    /* Check parameters */
    if (!DestinationString || !SourceString) return FALSE;

    /* Check if size if ok */
    // We can't do this atm and truncate the string instead.
    //if (SourceString->Length > 0xffff) return FALSE;

    RtlInitUnicodeString(DestinationString, NULL);

    if (SourceString->bAnsi)
    {
        RtlInitAnsiString(&AnsiString, (LPSTR)SourceString->Buffer);
        return NT_SUCCESS(RtlAnsiStringToUnicodeString(DestinationString, &AnsiString, TRUE));
    }
    else
    {
        return RtlCreateUnicodeString(DestinationString, SourceString->Buffer);
    }
}