Windows2000/private/ntos/rtl/atom.c
2020-09-30 17:12:32 +02:00

906 lines
24 KiB
C

/*++
Copyright (c) 1990 Microsoft Corporation
Module Name:
atom.c
Abstract:
This file contains the common code to implement atom tables. It is called
by both the user mode Win32 Atom API functions (Local/GlobalxxxAtom) and
by the kernel mode window manager code to access global atoms.
Author:
Steve Wood (stevewo) 26-Oct-1990
Revision History:
--*/
#include "ntrtlp.h"
#include "atom.h"
ULONG RtlpAtomAllocateTag;
PVOID RtlpAllocateAtom(IN ULONG NumberOfBytes)
{
#if defined(NTOS_KERNEL_RUNTIME)
return ExAllocatePoolWithTag( NonPagedPool, NumberOfBytes, RtlpAtomAllocateTag );
#else
return RtlAllocateHeap( RtlProcessHeap(), RtlpAtomAllocateTag, NumberOfBytes );
#endif
}
void RtlpFreeAtom(IN PVOID p)
{
#if defined(NTOS_KERNEL_RUNTIME)
ExFreePool( p );
#else
RtlFreeHeap( RtlProcessHeap(), 0, p );
#endif
return;
}
void RtlpInitializeLockAtomTable(IN OUT PRTL_ATOM_TABLE AtomTable)
{
#if defined(NTOS_KERNEL_RUNTIME)
ExInitializeFastMutex( &AtomTable->FastMutex );
#else
RtlInitializeCriticalSection( &AtomTable->CriticalSection );
#endif
}
BOOLEAN RtlpLockAtomTable(IN PRTL_ATOM_TABLE AtomTable)
{
if (AtomTable == NULL || AtomTable->Signature != RTL_ATOM_TABLE_SIGNATURE) {
return FALSE;
}
#if defined(NTOS_KERNEL_RUNTIME)
ExAcquireFastMutex( &AtomTable->FastMutex );
#else
RtlEnterCriticalSection( &AtomTable->CriticalSection );
#endif
return TRUE;
}
void RtlpUnlockAtomTable(IN PRTL_ATOM_TABLE AtomTable)
{
#if defined(NTOS_KERNEL_RUNTIME)
ExReleaseFastMutex( &AtomTable->FastMutex );
#else
RtlLeaveCriticalSection( &AtomTable->CriticalSection );
#endif
}
void
RtlpDestroyLockAtomTable(
IN OUT PRTL_ATOM_TABLE AtomTable
)
{
#if defined(NTOS_KERNEL_RUNTIME)
#else
RtlDeleteCriticalSection( &AtomTable->CriticalSection );
#endif
}
BOOLEAN
RtlpInitializeHandleTableForAtomTable(
PRTL_ATOM_TABLE AtomTable
)
{
#if defined(NTOS_KERNEL_RUNTIME)
AtomTable->ExHandleTable = ExCreateHandleTable( NULL );
if (AtomTable->ExHandleTable != NULL) {
// Make sure atom handle tables are NOT part of object handle enumeration
ExRemoveHandleTable( AtomTable->ExHandleTable );
return TRUE;
}
else {
return FALSE;
}
#else
RtlInitializeHandleTable( (ULONG)(USHORT)~RTL_ATOM_MAXIMUM_INTEGER_ATOM,
sizeof( RTL_ATOM_HANDLE_TABLE_ENTRY ),
&AtomTable->RtlHandleTable
);
return TRUE;
#endif
}
void
RtlpDestroyHandleTableForAtomTable(
PRTL_ATOM_TABLE AtomTable
)
{
#if defined(NTOS_KERNEL_RUNTIME)
ExDestroyHandleTable( AtomTable->ExHandleTable, NULL );
#else
RtlDestroyHandleTable( &AtomTable->RtlHandleTable );
#endif
return;
}
PRTL_ATOM_TABLE_ENTRY
RtlpAtomMapAtomToHandleEntry(
IN PRTL_ATOM_TABLE AtomTable,
IN ULONG HandleIndex
)
{
#if defined(NTOS_KERNEL_RUNTIME)
PHANDLE_TABLE_ENTRY ExHandleEntry;
PRTL_ATOM_TABLE_ENTRY a;
EXHANDLE ExHandle;
ExHandle.Index = HandleIndex;
ExHandleEntry = ExMapHandleToPointer( AtomTable->ExHandleTable,
ExHandle.GenericHandleOverlay
);
if (ExHandleEntry != NULL) {
a = ExHandleEntry->Object;
ExUnlockHandleTableEntry( AtomTable->ExHandleTable, ExHandleEntry );
return a;
}
#else
PRTL_ATOM_HANDLE_TABLE_ENTRY HandleEntry;
if (RtlIsValidIndexHandle( &AtomTable->RtlHandleTable,
HandleIndex,
(PRTL_HANDLE_TABLE_ENTRY *)&HandleEntry
)
) {
return HandleEntry->Atom;
}
#endif
return NULL;
}
BOOLEAN
RtlpCreateHandleForAtom(
PRTL_ATOM_TABLE p,
PRTL_ATOM_TABLE_ENTRY a
)
{
#if defined(NTOS_KERNEL_RUNTIME)
EXHANDLE ExHandle;
HANDLE_TABLE_ENTRY ExHandleEntry;
ExHandleEntry.Object = a;
ExHandleEntry.GrantedAccess = 0;
ExHandle.GenericHandleOverlay = ExCreateHandle( p->ExHandleTable, &ExHandleEntry );
if (ExHandle.GenericHandleOverlay != NULL) {
a->HandleIndex = (USHORT)ExHandle.Index;
a->Atom = (RTL_ATOM)((USHORT)a->HandleIndex | RTL_ATOM_MAXIMUM_INTEGER_ATOM);
return TRUE;
}
#else
PRTL_ATOM_HANDLE_TABLE_ENTRY HandleEntry;
ULONG HandleIndex;
HandleEntry = (PRTL_ATOM_HANDLE_TABLE_ENTRY)RtlAllocateHandle( &p->RtlHandleTable,
&HandleIndex
);
if (HandleEntry != NULL) {
if (HandleIndex < RTL_ATOM_MAXIMUM_INTEGER_ATOM) {
a->HandleIndex = (USHORT)HandleIndex;
a->Atom = (RTL_ATOM)((USHORT)HandleIndex | RTL_ATOM_MAXIMUM_INTEGER_ATOM);
HandleEntry->Atom = a;
HandleEntry->LockCount = 0;
HandleEntry->Flags = RTL_HANDLE_ALLOCATED;
return TRUE;
}
RtlFreeHandle( &p->RtlHandleTable, (PRTL_HANDLE_TABLE_ENTRY)HandleEntry );
}
#endif
return FALSE;
}
void
RtlpFreeHandleForAtom(
PRTL_ATOM_TABLE p,
PRTL_ATOM_TABLE_ENTRY a
)
{
#if defined(NTOS_KERNEL_RUNTIME)
EXHANDLE ExHandle;
ExHandle.Index = a->HandleIndex;
ExDestroyHandle( p->ExHandleTable, ExHandle.GenericHandleOverlay, NULL );
#else
PRTL_ATOM_HANDLE_TABLE_ENTRY HandleEntry;
if (RtlIsValidIndexHandle( &p->RtlHandleTable,
a->HandleIndex,
(PRTL_HANDLE_TABLE_ENTRY *)&HandleEntry
)
) {
RtlFreeHandle( &p->RtlHandleTable, (PRTL_HANDLE_TABLE_ENTRY)HandleEntry );
}
#endif
return;
}
NTSTATUS
RtlInitializeAtomPackage(
IN ULONG AllocationTag
)
{
RtlpAtomAllocateTag = AllocationTag;
return STATUS_SUCCESS;
}
NTSTATUS
RtlCreateAtomTable(
IN ULONG NumberOfBuckets,
OUT PVOID *AtomTableHandle
)
{
NTSTATUS Status;
PRTL_ATOM_TABLE p;
ULONG Size;
Status = STATUS_SUCCESS;
if (*AtomTableHandle == NULL) {
if (NumberOfBuckets <= 1) {
NumberOfBuckets = RTL_ATOM_TABLE_DEFAULT_NUMBER_OF_BUCKETS;
}
Size = sizeof( RTL_ATOM_TABLE ) +
(sizeof( RTL_ATOM_TABLE_ENTRY ) * (NumberOfBuckets-1));
p = (PRTL_ATOM_TABLE)RtlpAllocateAtom( Size );
if (p == NULL) {
Status = STATUS_NO_MEMORY;
}
else {
RtlZeroMemory( p, Size );
p->NumberOfBuckets = NumberOfBuckets;
if (RtlpInitializeHandleTableForAtomTable( p )) {
RtlpInitializeLockAtomTable( p );
p->Signature = RTL_ATOM_TABLE_SIGNATURE;
*AtomTableHandle = p;
}
else {
Status = STATUS_NO_MEMORY;
RtlpFreeAtom( p );
}
}
}
return Status;
}
NTSTATUS
RtlDestroyAtomTable(
IN PVOID AtomTableHandle
)
{
NTSTATUS Status;
PRTL_ATOM_TABLE p = (PRTL_ATOM_TABLE)AtomTableHandle;
PRTL_ATOM_TABLE_ENTRY a, aNext, *pa;
ULONG i;
Status = STATUS_SUCCESS;
if (!RtlpLockAtomTable( p )) {
return STATUS_INVALID_PARAMETER;
}
try {
pa = &p->Buckets[ 0 ];
for (i=0; i<p->NumberOfBuckets; i++) {
aNext = *pa;
*pa++ = NULL;
while ((a = aNext) != NULL) {
aNext = a->HashLink;
a->HashLink = NULL;
RtlpFreeAtom( a );
}
}
p->Signature = 0;
RtlpUnlockAtomTable( p );
RtlpDestroyHandleTableForAtomTable( p );
RtlpDestroyLockAtomTable( p );
RtlZeroMemory( p, sizeof( RTL_ATOM_TABLE ) );
RtlpFreeAtom( p );
}
except (EXCEPTION_EXECUTE_HANDLER) {
Status = GetExceptionCode();
}
return Status;
}
NTSTATUS
RtlEmptyAtomTable(
IN PVOID AtomTableHandle,
IN BOOLEAN IncludePinnedAtoms
)
{
NTSTATUS Status;
PRTL_ATOM_TABLE p = (PRTL_ATOM_TABLE)AtomTableHandle;
PRTL_ATOM_TABLE_ENTRY a, aNext, *pa, *pa1;
ULONG i;
Status = STATUS_SUCCESS;
if (!RtlpLockAtomTable( p )) {
return STATUS_INVALID_PARAMETER;
}
try {
pa = &p->Buckets[ 0 ];
for (i=0; i<p->NumberOfBuckets; i++) {
pa1 = pa++;
while ((a = *pa1) != NULL) {
if (IncludePinnedAtoms || !(a->Flags & RTL_ATOM_PINNED)) {
*pa1 = a->HashLink;
a->HashLink = NULL;
RtlpFreeHandleForAtom( p, a );
RtlpFreeAtom( a );
}
else {
pa1 = &a->HashLink;
}
}
}
RtlpUnlockAtomTable( p );
}
except (EXCEPTION_EXECUTE_HANDLER) {
Status = GetExceptionCode();
}
return Status;
}
BOOLEAN
RtlpGetIntegerAtom(
PWSTR Name,
PRTL_ATOM Atom OPTIONAL
)
{
NTSTATUS Status;
UNICODE_STRING UnicodeString;
PWSTR s;
ULONG n;
RTL_ATOM Temp;
if (((ULONG_PTR)Name & -0x10000) == 0) {
Temp = (RTL_ATOM)(USHORT)PtrToUlong(Name);
if (Temp >= RTL_ATOM_MAXIMUM_INTEGER_ATOM) {
return FALSE;
}
else {
if (Temp == RTL_ATOM_INVALID_ATOM) {
Temp = RTL_ATOM_MAXIMUM_INTEGER_ATOM;
}
if (ARGUMENT_PRESENT( Atom )) {
*Atom = Temp;
}
return TRUE;
}
}
else
if (*Name != L'#') {
return FALSE;
}
s = ++Name;
while (*s != UNICODE_NULL) {
if (*s < L'0' || *s > L'9') {
return FALSE;
}
else {
s++;
}
}
n = 0;
UnicodeString.Buffer = Name;
UnicodeString.Length = (USHORT)((PCHAR)s - (PCHAR)Name);
UnicodeString.MaximumLength = UnicodeString.Length;
Status = RtlUnicodeStringToInteger( &UnicodeString, 10, &n );
if (NT_SUCCESS( Status )) {
if (ARGUMENT_PRESENT( Atom )) {
if (n == 0 || n > RTL_ATOM_MAXIMUM_INTEGER_ATOM) {
*Atom = RTL_ATOM_MAXIMUM_INTEGER_ATOM;
}
else {
*Atom = (RTL_ATOM)n;
}
}
return TRUE;
}
else {
return FALSE;
}
}
PRTL_ATOM_TABLE_ENTRY
RtlpHashStringToAtom(
IN PRTL_ATOM_TABLE p,
IN PWSTR Name,
OUT PRTL_ATOM_TABLE_ENTRY **PreviousAtom OPTIONAL,
OUT PULONG NameLength
)
{
ULONG Length, Hash;
WCHAR c;
PWCH s;
RTL_ATOM Atom;
PRTL_ATOM_TABLE_ENTRY *pa, a;
if (((ULONG_PTR)Name & -0x10000) == 0) {
Atom = (RTL_ATOM)(USHORT)PtrToUlong(Name);
a = NULL;
if (Atom >= RTL_ATOM_MAXIMUM_INTEGER_ATOM) {
a = RtlpAtomMapAtomToHandleEntry( p,
(ULONG)(Atom & (USHORT)~RTL_ATOM_MAXIMUM_INTEGER_ATOM)
);
}
if (ARGUMENT_PRESENT( PreviousAtom )) {
*PreviousAtom = NULL;
}
return a;
}
s = Name;
Hash = 0;
while (*s != UNICODE_NULL) {
c = RtlUpcaseUnicodeChar( *s++ );
Hash = Hash + (c << 1) + (c >> 1) + c;
}
Length = (ULONG) (s - Name);
if (Length > RTL_ATOM_MAXIMUM_NAME_LENGTH) {
pa = NULL;
a = NULL;
}
else {
pa = &p->Buckets[ Hash % p->NumberOfBuckets ];
while (a = *pa) {
if (a->NameLength == Length && !_wcsicmp( a->Name, Name )) {
break;
}
else {
pa = &a->HashLink;
}
}
}
if (ARGUMENT_PRESENT( PreviousAtom )) {
*PreviousAtom = pa;
}
if (a == NULL && ARGUMENT_PRESENT( NameLength )) {
*NameLength = Length * sizeof( WCHAR );
}
return a;
}
NTSTATUS
RtlAddAtomToAtomTable(
IN PVOID AtomTableHandle,
IN PWSTR AtomName OPTIONAL,
IN OUT PRTL_ATOM Atom OPTIONAL
)
{
NTSTATUS Status;
PRTL_ATOM_TABLE p = (PRTL_ATOM_TABLE)AtomTableHandle;
PRTL_ATOM_TABLE_ENTRY a, *pa;
ULONG NameLength;
RTL_ATOM Temp;
if (!RtlpLockAtomTable( p )) {
return STATUS_INVALID_PARAMETER;
}
try {
if (RtlpGetIntegerAtom( AtomName, &Temp )) {
if (Temp >= RTL_ATOM_MAXIMUM_INTEGER_ATOM) {
Temp = RTL_ATOM_INVALID_ATOM;
Status = STATUS_INVALID_PARAMETER;
}
else {
Status = STATUS_SUCCESS;
}
if (ARGUMENT_PRESENT( Atom )) {
*Atom = Temp;
}
}
else
if (*AtomName == UNICODE_NULL) {
Status = STATUS_OBJECT_NAME_INVALID;
}
else {
a = RtlpHashStringToAtom( p, AtomName, &pa, &NameLength );
if (a == NULL) {
if (pa != NULL) {
Status = STATUS_NO_MEMORY;
a = RtlpAllocateAtom( FIELD_OFFSET( RTL_ATOM_TABLE_ENTRY, Name ) +
NameLength + sizeof( UNICODE_NULL )
);
if (a != NULL) {
a->HashLink = NULL;
a->ReferenceCount = 1;
a->Flags = 0;
RtlMoveMemory( a->Name, AtomName, NameLength );
a->NameLength = (UCHAR)(NameLength / sizeof( WCHAR ));
a->Name[ a->NameLength ] = UNICODE_NULL;
if (RtlpCreateHandleForAtom( p, a )) {
a->Atom = (RTL_ATOM)a->HandleIndex | RTL_ATOM_MAXIMUM_INTEGER_ATOM;
*pa = a;
if (ARGUMENT_PRESENT( Atom )) {
*Atom = a->Atom;
}
Status = STATUS_SUCCESS;
}
else {
RtlpFreeAtom( a );
}
}
}
else {
Status = STATUS_INVALID_PARAMETER;
}
}
else {
if (!(a->Flags & RTL_ATOM_PINNED)) {
if (a->ReferenceCount == 0xFFFF) {
KdPrint(( "RTL: Pinning atom (%x) as reference count about to wrap\n", Atom ));
a->Flags |= RTL_ATOM_PINNED;
}
else {
a->ReferenceCount += 1;
}
}
if (ARGUMENT_PRESENT( Atom )) {
*Atom = a->Atom;
}
Status = STATUS_SUCCESS;
}
}
}
except (EXCEPTION_EXECUTE_HANDLER) {
Status = GetExceptionCode();
}
RtlpUnlockAtomTable( p );
return Status;
}
NTSTATUS
RtlLookupAtomInAtomTable(
IN PVOID AtomTableHandle,
IN PWSTR AtomName,
OUT PRTL_ATOM Atom OPTIONAL
)
{
NTSTATUS Status;
PRTL_ATOM_TABLE p = (PRTL_ATOM_TABLE)AtomTableHandle;
PRTL_ATOM_TABLE_ENTRY a;
RTL_ATOM Temp;
if (!RtlpLockAtomTable( p )) {
return STATUS_INVALID_PARAMETER;
}
try {
if (RtlpGetIntegerAtom( AtomName, &Temp )) {
if (Temp >= RTL_ATOM_MAXIMUM_INTEGER_ATOM) {
Temp = RTL_ATOM_INVALID_ATOM;
Status = STATUS_INVALID_PARAMETER;
}
else {
Status = STATUS_SUCCESS;
}
if (ARGUMENT_PRESENT( Atom )) {
*Atom = Temp;
}
}
else
if (*AtomName == UNICODE_NULL) {
Status = STATUS_OBJECT_NAME_INVALID;
}
else {
a = RtlpHashStringToAtom( p, AtomName, NULL, NULL );
if (a == NULL) {
Status = STATUS_OBJECT_NAME_NOT_FOUND;
}
else {
if (RtlpAtomMapAtomToHandleEntry( p, (ULONG)a->HandleIndex ) != NULL) {
Status = STATUS_SUCCESS;
if (ARGUMENT_PRESENT( Atom )) {
*Atom = a->Atom;
}
}
else {
Status = STATUS_INVALID_HANDLE;
}
}
}
}
except (EXCEPTION_EXECUTE_HANDLER) {
Status = GetExceptionCode();
}
RtlpUnlockAtomTable( p );
return Status;
}
NTSTATUS
RtlDeleteAtomFromAtomTable(
IN PVOID AtomTableHandle,
IN RTL_ATOM Atom
)
{
NTSTATUS Status;
PRTL_ATOM_TABLE p = (PRTL_ATOM_TABLE)AtomTableHandle;
PRTL_ATOM_TABLE_ENTRY a, *pa;
if (!RtlpLockAtomTable( p )) {
return STATUS_INVALID_PARAMETER;
}
try {
Status = STATUS_INVALID_HANDLE;
if (Atom >= RTL_ATOM_MAXIMUM_INTEGER_ATOM) {
a = RtlpAtomMapAtomToHandleEntry( p,
(ULONG)(Atom & (USHORT)~RTL_ATOM_MAXIMUM_INTEGER_ATOM)
);
if (a != NULL && a->Atom == Atom) {
Status = STATUS_SUCCESS;
if (a->Flags & RTL_ATOM_PINNED) {
KdPrint(( "RTL: Ignoring attempt to delete a pinned atom (%x)\n", Atom ));
Status = STATUS_WAS_LOCKED; // This is a success status code!
}
else
if (--a->ReferenceCount == 0) {
a = RtlpHashStringToAtom( p, a->Name, &pa, NULL );
if (a != NULL) {
*pa = a->HashLink;
RtlpFreeHandleForAtom( p, a );
RtlpFreeAtom( a );
}
}
}
}
else
if (Atom != RTL_ATOM_INVALID_ATOM) {
Status = STATUS_SUCCESS;
}
}
except (EXCEPTION_EXECUTE_HANDLER) {
Status = GetExceptionCode();
}
RtlpUnlockAtomTable( p );
return Status;
}
NTSTATUS
RtlPinAtomInAtomTable(
IN PVOID AtomTableHandle,
IN RTL_ATOM Atom
)
{
NTSTATUS Status;
PRTL_ATOM_TABLE p = (PRTL_ATOM_TABLE)AtomTableHandle;
PRTL_ATOM_TABLE_ENTRY a, *pa;
if (!RtlpLockAtomTable( p )) {
return STATUS_INVALID_PARAMETER;
}
try {
Status = STATUS_INVALID_HANDLE;
if (Atom >= RTL_ATOM_MAXIMUM_INTEGER_ATOM) {
a = RtlpAtomMapAtomToHandleEntry( p,
(ULONG)(Atom & (USHORT)~RTL_ATOM_MAXIMUM_INTEGER_ATOM)
);
if (a != NULL && a->Atom == Atom) {
Status = STATUS_SUCCESS;
a->Flags |= RTL_ATOM_PINNED;
}
}
else
if (Atom != RTL_ATOM_INVALID_ATOM) {
Status = STATUS_SUCCESS;
}
}
except (EXCEPTION_EXECUTE_HANDLER) {
Status = GetExceptionCode();
}
RtlpUnlockAtomTable( p );
return Status;
}
NTSTATUS
RtlQueryAtomInAtomTable(
IN PVOID AtomTableHandle,
IN RTL_ATOM Atom,
OUT PULONG AtomUsage OPTIONAL,
OUT PULONG AtomFlags OPTIONAL,
IN OUT PWSTR AtomName OPTIONAL,
IN OUT PULONG AtomNameLength OPTIONAL
)
{
NTSTATUS Status;
PRTL_ATOM_TABLE p = (PRTL_ATOM_TABLE)AtomTableHandle;
PRTL_ATOM_TABLE_ENTRY a;
WCHAR AtomNameBuffer[ 16 ];
ULONG CopyLength;
if (!RtlpLockAtomTable( p )) {
return STATUS_INVALID_PARAMETER;
}
try {
if (Atom < RTL_ATOM_MAXIMUM_INTEGER_ATOM) {
if (Atom == RTL_ATOM_INVALID_ATOM) {
Status = STATUS_INVALID_PARAMETER;
}
else {
Status = STATUS_SUCCESS;
if (ARGUMENT_PRESENT( AtomUsage )) {
*AtomUsage = 1;
}
if (ARGUMENT_PRESENT( AtomFlags )) {
*AtomFlags = RTL_ATOM_PINNED;
}
if (ARGUMENT_PRESENT( AtomName )) {
CopyLength = _snwprintf( AtomNameBuffer,
sizeof( AtomNameBuffer ) / sizeof( WCHAR ),
L"#%u",
Atom
) * sizeof( WCHAR );
if (CopyLength >= *AtomNameLength) {
if (*AtomNameLength >= sizeof( UNICODE_NULL )) {
CopyLength = *AtomNameLength - sizeof( UNICODE_NULL );
}
else {
CopyLength = 0;
}
}
if (CopyLength != 0) {
RtlMoveMemory( AtomName, AtomNameBuffer, CopyLength );
AtomName[ CopyLength / sizeof( WCHAR ) ] = UNICODE_NULL;
*AtomNameLength = CopyLength;
}
else {
Status = STATUS_BUFFER_TOO_SMALL;
}
}
}
}
else {
a = RtlpAtomMapAtomToHandleEntry( p,
(ULONG)(Atom & (USHORT)~RTL_ATOM_MAXIMUM_INTEGER_ATOM)
);
if (a != NULL && a->Atom == Atom) {
Status = STATUS_SUCCESS;
if (ARGUMENT_PRESENT( AtomUsage )) {
*AtomUsage = a->ReferenceCount;
}
if (ARGUMENT_PRESENT( AtomFlags )) {
*AtomFlags = a->Flags;
}
if (ARGUMENT_PRESENT( AtomName )) {
// Fill in as much of the atom string as possible, and
// always zero terminate. This is what win3.1 does.
CopyLength = a->NameLength * sizeof( WCHAR );
if (CopyLength >= *AtomNameLength) {
if (*AtomNameLength >= sizeof( UNICODE_NULL )) {
CopyLength = *AtomNameLength - sizeof( UNICODE_NULL );
}
else {
*AtomNameLength = CopyLength;
CopyLength = 0;
}
}
if (CopyLength != 0) {
RtlMoveMemory( AtomName, a->Name, CopyLength );
AtomName[ CopyLength / sizeof( WCHAR ) ] = UNICODE_NULL;
*AtomNameLength = CopyLength;
}
else {
Status = STATUS_BUFFER_TOO_SMALL;
}
}
}
else {
Status = STATUS_INVALID_HANDLE;
}
}
}
except (EXCEPTION_EXECUTE_HANDLER) {
Status = GetExceptionCode();
}
RtlpUnlockAtomTable( p );
return Status;
}
NTSTATUS
RtlQueryAtomsInAtomTable(
IN PVOID AtomTableHandle,
IN ULONG MaximumNumberOfAtoms,
OUT PULONG NumberOfAtoms,
OUT PRTL_ATOM Atoms
)
{
NTSTATUS Status;
PRTL_ATOM_TABLE p = (PRTL_ATOM_TABLE)AtomTableHandle;
PRTL_ATOM_TABLE_ENTRY a;
ULONG i;
ULONG CurrentAtomIndex;
if (!RtlpLockAtomTable( p )) {
return STATUS_INVALID_PARAMETER;
}
Status = STATUS_SUCCESS;
try {
CurrentAtomIndex = 0;
for (i=0; i<p->NumberOfBuckets; i++) {
a = p->Buckets[ i ];
while (a) {
if (CurrentAtomIndex < MaximumNumberOfAtoms) {
Atoms[ CurrentAtomIndex ] = a->Atom;
}
else {
Status = STATUS_INFO_LENGTH_MISMATCH;
}
CurrentAtomIndex += 1;
a = a->HashLink;
}
}
*NumberOfAtoms = CurrentAtomIndex;
}
except (EXCEPTION_EXECUTE_HANDLER) {
Status = GetExceptionCode();
}
RtlpUnlockAtomTable( p );
return Status;
}