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Fix RtlQueryAtomInAtomTable and add regression tests

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svn path=/trunk/; revision=18020
This commit is contained in:
Gé van Geldorp 2005-09-23 21:08:57 +00:00
parent 128c57f209
commit ce7453f9ed
3 changed files with 84 additions and 54 deletions
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118
reactos/lib/rtl/atom.c
View file

@ -565,6 +565,23 @@ RtlPinAtomInAtomTable(IN PRTL_ATOM_TABLE AtomTable,
/*
* @implemented
*
* This API is really messed up with regards to NameLength. If you pass in a
* valid buffer for AtomName, NameLength should be the size of the buffer
* (in bytes, not characters). So if you expect the string to be 6 char long,
* you need to allocate a buffer of 7 WCHARs and pass 14 for NameLength.
* The AtomName returned is always null terminated. If the NameLength you pass
* is smaller than 4 (4 would leave room for 1 character) the function will
* return with status STATUS_BUFFER_TOO_SMALL. If you pass more than 4, the
* return status will be STATUS_SUCCESS, even if the buffer is not large enough
* to hold the complete string. In that case, the string is silently truncated
* and made to fit in the provided buffer. On return NameLength is set to the
* number of bytes (but EXCLUDING the bytes for the null terminator) copied.
* So, if the string is 6 char long, you pass a buffer of 10 bytes, on return
* NameLength will be set to 8.
* If you pass in a NULL value for AtomName, the length of the string in bytes
* (again EXCLUDING the null terminator) is returned in NameLength, at least
* on Win2k, XP and ReactOS. NT4 will return 0 in that case.
*/
NTSTATUS STDCALL
RtlQueryAtomInAtomTable(PRTL_ATOM_TABLE AtomTable,
@ -575,53 +592,34 @@ RtlQueryAtomInAtomTable(PRTL_ATOM_TABLE AtomTable,
PULONG NameLength)
{
ULONG Length;
union
{
/* A RTL_ATOM_TABLE_ENTRY has a "WCHAR Name[1]" entry at the end.
* Make sure we reserve enough room to facilitate a 12 character name */
RTL_ATOM_TABLE_ENTRY AtomTableEntry;
WCHAR StringBuffer[sizeof(RTL_ATOM_TABLE_ENTRY) / sizeof(WCHAR) + 12];
} NumberEntry;
PRTL_ATOM_TABLE_ENTRY Entry;
NTSTATUS Status = STATUS_SUCCESS;
if (Atom < 0xC000)
{
if (RefCount != NULL)
{
*RefCount = 1;
}
if (PinCount != NULL)
{
*PinCount = 1;
}
if ((AtomName != NULL) && (NameLength != NULL) && (NameLength > 0))
{
WCHAR NameString[12];
Length = swprintf(NameString, L"#%lu", (ULONG)Atom) * sizeof(WCHAR);
if (*NameLength < Length + sizeof(WCHAR))
{
*NameLength = Length;
Status = STATUS_BUFFER_TOO_SMALL;
}
else
{
RtlCopyMemory(AtomName,
NameString,
Length);
AtomName[Length / sizeof(WCHAR)] = L'\0';
*NameLength = Length;
}
}
else if (NameLength != NULL)
{
*NameLength = (Entry->NameLength + 1) * sizeof(WCHAR);
}
return Status;
/* Synthesize an entry */
NumberEntry.AtomTableEntry.Atom = Atom;
NumberEntry.AtomTableEntry.NameLength = swprintf(NumberEntry.AtomTableEntry.Name,
L"#%lu",
(ULONG)Atom);
NumberEntry.AtomTableEntry.ReferenceCount = 1;
NumberEntry.AtomTableEntry.Flags = RTL_ATOM_IS_PINNED;
Entry = &NumberEntry.AtomTableEntry;
}
else
{
RtlpLockAtomTable(AtomTable);
RtlpLockAtomTable(AtomTable);
Entry = RtlpGetAtomEntry(AtomTable,
(ULONG)((USHORT)Atom - 0xC000));
Entry = RtlpGetAtomEntry(AtomTable,
(ULONG)((USHORT)Atom - 0xC000));
}
if (Entry != NULL && Entry->Atom == (USHORT)Atom)
{
@ -637,27 +635,40 @@ RtlQueryAtomInAtomTable(PRTL_ATOM_TABLE AtomTable,
*PinCount = ((Entry->Flags & RTL_ATOM_IS_PINNED) != 0);
}
if ((AtomName != NULL) && (NameLength != NULL))
if (NULL != NameLength)
{
Length = Entry->NameLength * sizeof(WCHAR);
if (*NameLength < Length + sizeof(WCHAR))
if (NULL != AtomName)
{
*NameLength = Length;
Status = STATUS_BUFFER_TOO_SMALL;
if (*NameLength < Length + sizeof(WCHAR))
{
if (*NameLength < 4)
{
*NameLength = Length;
Status = STATUS_BUFFER_TOO_SMALL;
}
else
{
Length = *NameLength - sizeof(WCHAR);
}
}
if (NT_SUCCESS(Status))
{
RtlCopyMemory(AtomName,
Entry->Name,
Length);
AtomName[Length / sizeof(WCHAR)] = L'\0';
*NameLength = Length;
}
}
else
{
RtlCopyMemory(AtomName,
Entry->Name,
Length);
AtomName[Length / sizeof(WCHAR)] = L'\0';
*NameLength = Length;
}
}
else if (NameLength != NULL)
else if (NULL != AtomName)
{
*NameLength = (Entry->NameLength + 1) * sizeof(WCHAR);
Status = STATUS_INVALID_PARAMETER;
}
}
else
@ -665,7 +676,10 @@ RtlQueryAtomInAtomTable(PRTL_ATOM_TABLE AtomTable,
Status = STATUS_INVALID_HANDLE;
}
RtlpUnlockAtomTable(AtomTable);
if (NULL != Entry && Entry != &NumberEntry.AtomTableEntry)
{
RtlpUnlockAtomTable(AtomTable);
}
return Status;
}

13
reactos/regtests/winetests/ntdll/atom.c
View file

@ -233,6 +233,19 @@ static void test_NtAtom(void)
ok(res == STATUS_BUFFER_TOO_SMALL, "Got wrong retval, retval: %lx\n", res);
ok((strlenW(testAtom1) * sizeof(WCHAR)) == Len, "Got wrong length %lx\n", Len);
res = pRtlQueryAtomInAtomTable(AtomTable, Atom1, NULL, NULL, NULL, &Len);
ok(!res, "Failed to retrieve atom length, retval: %lx\n", res);
ok(Len == strlenW(testAtom1) * sizeof(WCHAR), "Invalid atom length got %lu expected %u\n",
Len, strlenW(testAtom1) * sizeof(WCHAR));
Len = strlenW(testAtom1) * sizeof(WCHAR);
Name[strlenW(testAtom1)] = '*';
res = pRtlQueryAtomInAtomTable(AtomTable, Atom1, NULL, NULL, Name, &Len);
ok(!res, "Failed with exactly long enough buffer, retval: %lx\n", res);
ok(Name[strlenW(testAtom1)] == '*', "Writing outside buffer\n");
ok(0 == memcmp(Name, testAtom1, (strlenW(testAtom1) - 1) * sizeof(WCHAR)),
"We found wrong atom!!\n");
res = pRtlPinAtomInAtomTable(AtomTable, Atom1);
ok(!res, "Unable to pin atom in atom table, retval: %lx\n", res);

7
reactos/subsys/win32k/ntuser/class.c
View file

@ -207,10 +207,13 @@ IntGetClassName(struct _WINDOW_OBJECT *WindowObject, LPWSTR lpClassName,
Length = 0;
Status = RtlQueryAtomInAtomTable(WinStaObject->AtomTable,
WindowObject->Class->Atom, NULL, NULL, NULL, &Length);
WindowObject->Class->Atom, NULL, NULL,
NULL, &Length);
Length += sizeof(WCHAR);
Name = ExAllocatePoolWithTag(PagedPool, Length, TAG_STRING);
Status = RtlQueryAtomInAtomTable(WinStaObject->AtomTable,
WindowObject->Class->Atom, NULL, NULL, Name, &Length);
WindowObject->Class->Atom, NULL, NULL,
Name, &Length);
if (!NT_SUCCESS(Status))
{
DPRINT("IntGetClassName: RtlQueryAtomInAtomTable failed\n");