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- Optimize IopApplyRosCdromArcHack by not searching for the second copy of ntoskrnl if we already found the first.

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- Also optimize stack usage by only using an ANSI buffer instead of having another Unicode buffer and unicode strings. Saves 530 bytes of stack.

svn path=/trunk/; revision=24457
This commit is contained in:
Alex Ionescu 2006-10-08 21:16:20 +00:00
parent 5e214ceaa0
commit b5f79593de
1 changed files with 44 additions and 20 deletions
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64
reactos/ntoskrnl/io/iomgr/arcname.c
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@ -28,9 +28,9 @@ IopApplyRosCdromArcHack(IN ULONG i)
{
ULONG DeviceNumber = -1;
OBJECT_ATTRIBUTES ObjectAttributes;
ANSI_STRING InstallName;
UNICODE_STRING DeviceName;
WCHAR Buffer[MAX_PATH];
CHAR AnsiBuffer[MAX_PATH];
CHAR Buffer[MAX_PATH];
FILE_BASIC_INFORMATION FileInfo;
NTSTATUS Status;
PCHAR p, q;
@ -39,29 +39,53 @@ IopApplyRosCdromArcHack(IN ULONG i)
p = strstr(KeLoaderBlock->ArcBootDeviceName, "cdrom");
if (p)
{
/* Try to find the installer */
swprintf(Buffer, L"\\Device\\CdRom%lu\\reactos\\ntoskrnl.exe", i);
RtlInitUnicodeString(&DeviceName, Buffer);
InitializeObjectAttributes(&ObjectAttributes,
&DeviceName,
0,
NULL,
NULL);
Status = ZwQueryAttributesFile(&ObjectAttributes, &FileInfo);
if (NT_SUCCESS(Status)) DeviceNumber = i;
/* Build installer name */
sprintf(Buffer, "\\Device\\CdRom%lu\\reactos\\ntoskrnl.exe", i);
RtlInitAnsiString(&InstallName, Buffer);
Status = RtlAnsiStringToUnicodeString(&DeviceName, &InstallName, TRUE);
if (!NT_SUCCESS(Status)) return FALSE;
/* Try to find live CD boot */
swprintf(Buffer,
L"\\Device\\CdRom%lu\\reactos\\system32\\ntoskrnl.exe",
i);
RtlInitUnicodeString(&DeviceName, Buffer);
/* Try to find the installer */
InitializeObjectAttributes(&ObjectAttributes,
&DeviceName,
0,
NULL,
NULL);
Status = ZwQueryAttributesFile(&ObjectAttributes, &FileInfo);
if (NT_SUCCESS(Status)) DeviceNumber = i;
/* Free the string */
RtlFreeUnicodeString(&DeviceName);
/* Check if we found the file */
if (NT_SUCCESS(Status))
{
/* We did, save the device number */
DeviceNumber = i;
}
else
{
/* Build live CD kernel name */
sprintf(Buffer,
"\\Device\\CdRom%lu\\reactos\\system32\\ntoskrnl.exe",
i);
RtlInitAnsiString(&InstallName, Buffer);
Status = RtlAnsiStringToUnicodeString(&DeviceName,
&InstallName,
TRUE);
if (!NT_SUCCESS(Status)) return FALSE;
/* Try to find it */
InitializeObjectAttributes(&ObjectAttributes,
&DeviceName,
0,
NULL,
NULL);
Status = ZwQueryAttributesFile(&ObjectAttributes, &FileInfo);
if (NT_SUCCESS(Status)) DeviceNumber = i;
/* Free the string */
RtlFreeUnicodeString(&DeviceName);
}
/* Build the name */
sprintf(p, "cdrom(%lu)", DeviceNumber);
@ -71,9 +95,9 @@ IopApplyRosCdromArcHack(IN ULONG i)
if (q)
{
q++;
strcpy(AnsiBuffer, q);
strcpy(Buffer, q);
sprintf(p, "cdrom(%lu)", DeviceNumber);
strcat(p, AnsiBuffer);
strcat(p, Buffer);
}
}