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windows-nt/Source/XPSP1/NT/base/boot/lib/nlsboot.c

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/*++
Copyright (c) 1992 Microsoft Corporation
Module Name:
nlsboot.c
Abstract:
This module contains NLS routines for use by the OS Loader. Before
the NLS tables are loaded, they convert between ANSI and Unicode by
zero-extending.
Author:
John Vert (jvert) 11-Nov-1992
Revision History:
John Vert (jvert) 11-Nov-1992
created - mostly copied from old RTL routines
--*/
#include "bldr.h"
//
// Hack-o-rama string routines to use before tables are loaded
//
#define upcase(C) (WCHAR )(((C) >= 'a' && (C) <= 'z' ? (C) - ('a' - 'A') : (C)))
NTSTATUS
RtlAnsiStringToUnicodeString(
OUT PUNICODE_STRING DestinationString,
IN PCANSI_STRING SourceString,
IN BOOLEAN AllocateDestinationString
)
{
ULONG UnicodeLength;
ULONG Index;
NTSTATUS st;
UnicodeLength = (SourceString->Length << 1) + sizeof(UNICODE_NULL);
if ( UnicodeLength > MAXUSHORT ) {
return STATUS_INVALID_PARAMETER_2;
}
DestinationString->Length = (USHORT)(UnicodeLength - sizeof(UNICODE_NULL));
if ( AllocateDestinationString ) {
return STATUS_NO_MEMORY;
}
else {
if ( DestinationString->Length >= DestinationString->MaximumLength ) {
return STATUS_BUFFER_OVERFLOW;
}
}
Index = 0;
while(Index < SourceString->Length ) {
DestinationString->Buffer[Index] = (WCHAR)SourceString->Buffer[Index];
Index++;
}
DestinationString->Buffer[Index] = UNICODE_NULL;
return STATUS_SUCCESS;
}
NTSTATUS
RtlUnicodeStringToAnsiString(
OUT PANSI_STRING DestinationString,
IN PCUNICODE_STRING SourceString,
IN BOOLEAN AllocateDestinationString
)
{
ULONG AnsiLength;
ULONG Index;
NTSTATUS st;
AnsiLength = SourceString->Length + 1;
if ( AnsiLength > MAXUSHORT ) {
return STATUS_INVALID_PARAMETER_2;
}
DestinationString->Length = (USHORT)(AnsiLength*2);
if ( AllocateDestinationString ) {
return STATUS_NO_MEMORY;
}
else {
if ( DestinationString->Length >= DestinationString->MaximumLength ) {
return STATUS_BUFFER_OVERFLOW;
}
}
Index = 0;
while(Index < SourceString->Length ) {
DestinationString->Buffer[Index] = (CHAR)SourceString->Buffer[Index];
Index++;
}
DestinationString->Buffer[Index] = TEXT('\0');
return STATUS_SUCCESS;
}
LONG
RtlCompareUnicodeString(
IN PCUNICODE_STRING String1,
IN PCUNICODE_STRING String2,
IN BOOLEAN CaseInSensitive
)
/*++
Routine Description:
The RtlCompareUnicodeString function compares two counted strings. The
return value indicates if the strings are equal or String1 is less than
String2 or String1 is greater than String2.
The CaseInSensitive parameter specifies if case is to be ignored when
doing the comparison.
Arguments:
String1 - Pointer to the first string.
String2 - Pointer to the second string.
CaseInsensitive - TRUE if case should be ignored when doing the
comparison.
Return Value:
Signed value that gives the results of the comparison:
Zero - String1 equals String2
< Zero - String1 less than String2
> Zero - String1 greater than String2
--*/
{
UNALIGNED WCHAR *s1, *s2;
USHORT n1, n2;
WCHAR c1, c2;
LONG cDiff;
s1 = String1->Buffer;
s2 = String2->Buffer;
n1 = (USHORT )(String1->Length / sizeof(WCHAR));
n2 = (USHORT )(String2->Length / sizeof(WCHAR));
while (n1 && n2) {
c1 = *s1++;
c2 = *s2++;
if (CaseInSensitive) {
//
// Note that this needs to reference the translation table !
//
c1 = upcase(c1);
c2 = upcase(c2);
}
if ((cDiff = ((LONG)c1 - (LONG)c2)) != 0) {
return( cDiff );
}
n1--;
n2--;
}
return( n1 - n2 );
}
BOOLEAN
RtlEqualUnicodeString(
IN const UNICODE_STRING *String1,
IN const UNICODE_STRING *String2,
IN BOOLEAN CaseInSensitive
)
/*++
Routine Description:
The RtlEqualUnicodeString function compares two counted unicode strings for
equality.
The CaseInSensitive parameter specifies if case is to be ignored when
doing the comparison.
Arguments:
String1 - Pointer to the first string.
String2 - Pointer to the second string.
CaseInsensitive - TRUE if case should be ignored when doing the
comparison.
Return Value:
Boolean value that is TRUE if String1 equals String2 and FALSE otherwise.
--*/
{
UNALIGNED WCHAR *s1, *s2;
USHORT n1, n2;
WCHAR c1, c2;
s1 = String1->Buffer;
s2 = String2->Buffer;
n1 = (USHORT )(String1->Length / sizeof(WCHAR));
n2 = (USHORT )(String2->Length / sizeof(WCHAR));
if ( n1 != n2 ) {
return FALSE;
}
if (CaseInSensitive) {
while ( n1 ) {
if ( *s1++ != *s2++ ) {
c1 = upcase(*(s1-1));
c2 = upcase(*(s2-1));
if (c1 != c2) {
return( FALSE );
}
}
n1--;
}
}
else {
while ( n1 ) {
if (*s1++ != *s2++) {
return( FALSE );
}
n1--;
}
}
return TRUE;
}
VOID
RtlInitString(
OUT PSTRING DestinationString,
IN PCSZ SourceString OPTIONAL
)
/*++
Routine Description:
The RtlInitString function initializes an NT counted string.
The DestinationString is initialized to point to the SourceString
and the Length and MaximumLength fields of DestinationString are
initialized to the length of the SourceString, which is zero if
SourceString is not specified.
Arguments:
DestinationString - Pointer to the counted string to initialize
SourceString - Optional pointer to a null terminated string that
the counted string is to point to.
Return Value:
None.
--*/
{
DestinationString->Length = 0;
DestinationString->Buffer = (PCHAR)SourceString;
if (ARGUMENT_PRESENT( SourceString )) {
while (*SourceString++) {
DestinationString->Length++;
}
DestinationString->MaximumLength = (SHORT)(DestinationString->Length+1);
}
else {
DestinationString->MaximumLength = 0;
}
}
VOID
RtlInitUnicodeString(
OUT PUNICODE_STRING DestinationString,
IN PCWSTR SourceString OPTIONAL
)
/*++
Routine Description:
The RtlInitUnicodeString function initializes an NT counted
unicode string. The DestinationString is initialized to point to
the SourceString and the Length and MaximumLength fields of
DestinationString are initialized to the length of the SourceString,
which is zero if SourceString is not specified.
Arguments:
DestinationString - Pointer to the counted string to initialize
SourceString - Optional pointer to a null terminated unicode string that
the counted string is to point to.
Return Value:
None.
--*/
{
USHORT Length = 0;
DestinationString->Length = 0;
DestinationString->Buffer = (PWSTR)SourceString;
if (ARGUMENT_PRESENT( SourceString )) {
while (*SourceString++) {
Length += sizeof(*SourceString);
}
DestinationString->Length = Length;
DestinationString->MaximumLength = Length+(USHORT)sizeof(UNICODE_NULL);
}
else {
DestinationString->MaximumLength = 0;
}
}
VOID
RtlInitAnsiString(
OUT PANSI_STRING DestinationString,
IN PCSTR SourceString OPTIONAL
)
/*++
Routine Description:
The RtlInitAnsiString function initializes an NT counted
ANSI string. The DestinationString is initialized to point to
the SourceString and the Length and MaximumLength fields of
DestinationString are initialized to the length of the SourceString,
which is zero if SourceString is not specified.
Arguments:
DestinationString - Pointer to the counted string to initialize
SourceString - Optional pointer to a null terminated ANSI string that
the counted string is to point to.
Return Value:
None.
--*/
{
USHORT Length = 0;
DestinationString->Length = 0;
DestinationString->Buffer = (PSTR)SourceString;
if (ARGUMENT_PRESENT( SourceString )) {
while (*SourceString++) {
Length += sizeof(*SourceString);
}
DestinationString->Length = Length;
DestinationString->MaximumLength = Length+1;
}
else {
DestinationString->MaximumLength = 0;
}
}
NTSTATUS
RtlAppendUnicodeStringToString (
IN OUT PUNICODE_STRING Destination,
IN PCUNICODE_STRING Source
)
/*++
Routine Description:
This routine will concatinate two PSTRINGs together. It will copy
bytes from the source up to the MaximumLength of the destination.
Arguments:
IN PSTRING Destination, - Supplies the destination string
IN PSTRING Source - Supplies the source for the string copy
Return Value:
STATUS_SUCCESS - The source string was successfully appended to the
destination counted string.
STATUS_BUFFER_TOO_SMALL - The destination string length was not big
enough to allow the source string to be appended. The Destination
string length is not updated.
--*/
{
USHORT n = Source->Length;
UNALIGNED WCHAR *dst;
if (n) {
if ((n + Destination->Length) > Destination->MaximumLength) {
return( STATUS_BUFFER_TOO_SMALL );
}
dst = &Destination->Buffer[ (Destination->Length / sizeof( WCHAR )) ];
RtlMoveMemory( dst, Source->Buffer, n );
Destination->Length += n;
if (Destination->Length < Destination->MaximumLength) {
dst[ n / sizeof( WCHAR ) ] = UNICODE_NULL;
}
}
return( STATUS_SUCCESS );
}
NTSTATUS
RtlAppendUnicodeToString (
IN PUNICODE_STRING Destination,
IN PCWSTR Source OPTIONAL
)
/*++
Routine Description:
This routine appends the supplied UNICODE string to an existing
PUNICODE_STRING.
It will copy bytes from the Source PSZ to the destination PSTRING up to
the destinations PUNICODE_STRING->MaximumLength field.
Arguments:
IN PUNICODE_STRING Destination, - Supplies a pointer to the destination
string
IN PWSTR Source - Supplies the string to append to the destination
Return Value:
STATUS_SUCCESS - The source string was successfully appended to the
destination counted string.
STATUS_BUFFER_TOO_SMALL - The destination string length was not big
enough to allow the source string to be appended. The Destination
string length is not updated.
--*/
{
USHORT n;
UNALIGNED WCHAR *dst;
if (ARGUMENT_PRESENT( Source )) {
UNICODE_STRING UniSource;
RtlInitUnicodeString(&UniSource, Source);
n = UniSource.Length;
if ((n + Destination->Length) > Destination->MaximumLength) {
return( STATUS_BUFFER_TOO_SMALL );
}
dst = &Destination->Buffer[ (Destination->Length / sizeof( WCHAR )) ];
RtlMoveMemory( dst, Source, n );
Destination->Length += n;
if (Destination->Length < Destination->MaximumLength) {
dst[ n / sizeof( WCHAR ) ] = UNICODE_NULL;
}
}
return( STATUS_SUCCESS );
}
WCHAR
RtlUpcaseUnicodeChar(
IN WCHAR SourceCharacter
)
/*++
Routine Description:
This function translates the specified unicode character to its
equivalent upcased unicode chararacter. The purpose for this routine
is to allow for character by character upcase translation. The
translation is done with respect to the current system locale
information.
Arguments:
SourceCharacter - Supplies the unicode character to be upcased.
Return Value:
Returns the upcased unicode equivalent of the specified input character.
--*/
{
return (upcase(SourceCharacter));
}
WCHAR
RtlAnsiCharToUnicodeChar(
IN OUT PUCHAR *SourceCharacter
)
/*++
Routine Description:
This function translates the specified ansi character to unicode and
returns the unicode value. The purpose for this routine is to allow
for character by character ansi to unicode translation. The
translation is done with respect to the current system locale
information.
Arguments:
SourceCharacter - Supplies a pointer to an ansi character pointer.
Through two levels of indirection, this supplies an ansi
character that is to be translated to unicode. After
translation, the ansi character pointer is modified to point to
the next character to be converted. This is done to allow for
dbcs ansi characters.
Return Value:
Returns the unicode equivalent of the specified ansi character.
--*/
{
WCHAR UnicodeCharacter;
ULONG cbCharSize;
NTSTATUS st;
UnicodeCharacter = (WCHAR)**SourceCharacter;
(*SourceCharacter)++;
return(UnicodeCharacter);
}
NTSTATUS
RtlUpcaseUnicodeToMultiByteN(
OUT PCH MultiByteString,
IN ULONG MaxBytesInMultiByteString,
OUT PULONG BytesInMultiByteString OPTIONAL,
IN PWCH UnicodeString,
IN ULONG BytesInUnicodeString)
/*++
Routine Description:
This functions upper cases the specified unicode source string and
converts it into an ansi string. The translation is done with respect
to the ANSI Code Page (ACP) loaded at boot time.
Arguments:
MultiByteString - Returns an ansi string that is equivalent to the
upper case of the unicode source string. If the translation can
not be done, an error is returned.
MaxBytesInMultiByteString - Supplies the maximum number of bytes to be
written to MultiByteString. If this causes MultiByteString to be a
truncated equivalent of UnicodeString, no error condition results.
BytesInMultiByteString - Returns the number of bytes in the returned
ansi string pointed to by MultiByteString.
UnicodeString - Supplies the unicode source string that is to be
converted to ansi.
BytesInUnicodeString - The number of bytes in the the string pointed to by
UnicodeString.
Return Value:
SUCCESS - The conversion was successful
--*/
{
ULONG TmpCount;
ULONG LoopCount;
ULONG CharsInUnicodeString;
UCHAR SbChar;
WCHAR UnicodeChar;
ULONG i;
//
// Convert Unicode byte count to character count. Byte count of
// multibyte string is equivalent to character count.
//
CharsInUnicodeString = BytesInUnicodeString / sizeof(WCHAR);
LoopCount = (CharsInUnicodeString < MaxBytesInMultiByteString) ?
CharsInUnicodeString : MaxBytesInMultiByteString;
if (ARGUMENT_PRESENT(BytesInMultiByteString))
*BytesInMultiByteString = LoopCount;
for (i=0;i<LoopCount;i++) {
MultiByteString[i] = (UCHAR)RtlUpcaseUnicodeChar((UCHAR)(UnicodeString[i]));
}
return STATUS_SUCCESS;
}
NTSTATUS
RtlMultiByteToUnicodeN(
OUT PWCH UnicodeString,
IN ULONG MaxBytesInUnicodeString,
OUT PULONG BytesInUnicodeString OPTIONAL,
IN PCSTR MultiByteString,
IN ULONG BytesInMultiByteString)
/*++
Routine Description:
This functions converts the specified ansi source string into a
Unicode string. The translation is done with respect to the
ANSI Code Page (ACP) installed at boot time. Single byte characters
in the range 0x00 - 0x7f are simply zero extended as a performance
enhancement. In some far eastern code pages 0x5c is defined as the
Yen sign. For system translation we always want to consider 0x5c
to be the backslash character. We get this for free by zero extending.
NOTE: This routine only supports precomposed Unicode characters.
Arguments:
UnicodeString - Returns a unicode string that is equivalent to
the ansi source string.
MaxBytesInUnicodeString - Supplies the maximum number of bytes to be
written to UnicodeString. If this causes UnicodeString to be a
truncated equivalent of MultiByteString, no error condition results.
BytesInUnicodeString - Returns the number of bytes in the returned
unicode string pointed to by UnicodeString.
MultiByteString - Supplies the ansi source string that is to be
converted to unicode.
BytesInMultiByteString - The number of bytes in the string pointed to
by MultiByteString.
Return Value:
SUCCESS - The conversion was successful.
--*/
{
ULONG LoopCount;
PUSHORT TranslateTable;
ULONG MaxCharsInUnicodeString;
ULONG i;
MaxCharsInUnicodeString = MaxBytesInUnicodeString / sizeof(WCHAR);
LoopCount = (MaxCharsInUnicodeString < BytesInMultiByteString) ?
MaxCharsInUnicodeString : BytesInMultiByteString;
if (ARGUMENT_PRESENT(BytesInUnicodeString))
*BytesInUnicodeString = LoopCount * sizeof(WCHAR);
for (i=0;i<LoopCount;i++) {
UnicodeString[i] = (WCHAR)((UCHAR)(MultiByteString[i]));
}
return(STATUS_SUCCESS);
}
NTSTATUS
RtlUnicodeToMultiByteN(
OUT PCH MultiByteString,
IN ULONG MaxBytesInMultiByteString,
OUT PULONG BytesInMultiByteString OPTIONAL,
IN PWCH UnicodeString,
IN ULONG BytesInUnicodeString)
/*++
Routine Description:
This functions converts the specified unicode source string into an
ansi string. The translation is done with respect to the
ANSI Code Page (ACP) loaded at boot time.
Arguments:
MultiByteString - Returns an ansi string that is equivalent to the
unicode source string. If the translation can not be done,
an error is returned.
MaxBytesInMultiByteString - Supplies the maximum number of bytes to be
written to MultiByteString. If this causes MultiByteString to be a
truncated equivalent of UnicodeString, no error condition results.
BytesInMultiByteString - Returns the number of bytes in the returned
ansi string pointed to by MultiByteString.
UnicodeString - Supplies the unicode source string that is to be
converted to ansi.
BytesInUnicodeString - The number of bytes in the the string pointed to by
UnicodeString.
Return Value:
SUCCESS - The conversion was successful
--*/
{
ULONG TmpCount;
ULONG LoopCount;
ULONG CharsInUnicodeString;
UCHAR SbChar;
WCHAR UnicodeChar;
ULONG i;
//
// Convert Unicode byte count to character count. Byte count of
// multibyte string is equivalent to character count.
//
CharsInUnicodeString = BytesInUnicodeString / sizeof(WCHAR);
LoopCount = (CharsInUnicodeString < MaxBytesInMultiByteString) ?
CharsInUnicodeString : MaxBytesInMultiByteString;
if (ARGUMENT_PRESENT(BytesInMultiByteString))
*BytesInMultiByteString = LoopCount;
for (i=0;i<LoopCount;i++) {
MultiByteString[i] = (CHAR)(UnicodeString[i]);
}
return STATUS_SUCCESS;
}

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