mirror of
https://github.com/reactos/reactos.git
synced 2024-08-05 19:11:16 +00:00
1f377076d7
Not all files are included, but these are necessary to compile cdrom driver. So far it can only be statically linked with drivers, a proper implementation requires wdfldr helper driver
150 lines
3 KiB
C++
150 lines
3 KiB
C++
/*++
|
|
|
|
Copyright (c) Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
FxTelemetry.cpp
|
|
|
|
Abstract:
|
|
|
|
This module implements a telemetry methods.
|
|
|
|
Author:
|
|
|
|
|
|
|
|
Environment:
|
|
|
|
Both kernel and user mode
|
|
|
|
Revision History:
|
|
|
|
Notes:
|
|
|
|
--*/
|
|
|
|
|
|
|
|
#include "fxsupportpch.hpp"
|
|
|
|
#if (FX_CORE_MODE == FX_CORE_KERNEL_MODE)
|
|
#include "fxldr.h"
|
|
#include <ntstrsafe.h>
|
|
#else
|
|
#include "driverframeworks-usermode-umevents.h"
|
|
#include "fxldrum.h"
|
|
#endif
|
|
|
|
extern "C" {
|
|
#if defined(EVENT_TRACING)
|
|
#include "fxtelemetry.tmh"
|
|
#endif
|
|
}
|
|
|
|
#if defined(__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
|
|
|
|
|
|
|
|
VOID
|
|
GetNameFromPath(
|
|
_In_ PCUNICODE_STRING Path,
|
|
_Out_ PUNICODE_STRING Name
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
Given a potential full path name, return just the filename portion, OR,
|
|
Given a potential full registry path name, return just the subkey portion.
|
|
|
|
Pointer to the filename protion in the full path name string, OR,
|
|
Pointer to the subkey portion in the full registry path name.
|
|
|
|
Arguments:
|
|
|
|
Path - Pointer to the full path name string.
|
|
|
|
Name - Pointer to receive the name
|
|
|
|
Return Value:
|
|
None
|
|
|
|
--*/
|
|
{
|
|
BOOLEAN foundSlash;
|
|
|
|
ASSERT(Path != NULL);
|
|
|
|
//
|
|
// Ideally a check of Path->Length == 0 would be sufficient except that
|
|
// PreFAST thinks that Length can be odd, so it thinks Length == 1 is possible.
|
|
// Comparing Length < sizeof(WCHAR) satisfies PreFAST and keeps the logic
|
|
// at runtime correct.
|
|
//
|
|
if (Path->Length < sizeof(WCHAR)) {
|
|
RtlZeroMemory(Name, sizeof(UNICODE_STRING));
|
|
return;
|
|
}
|
|
|
|
//
|
|
// Initialize Name to point to the last WCHAR of the buffer and we will work
|
|
// our way backwards to the beginning of the string or a \
|
|
//
|
|
|
|
Name->Buffer = WDF_PTR_ADD_OFFSET_TYPE(Path->Buffer,
|
|
Path->Length - sizeof(WCHAR),
|
|
PWCH);
|
|
Name->Length = sizeof(WCHAR);
|
|
foundSlash = FALSE;
|
|
|
|
while (Name->Buffer >= Path->Buffer) {
|
|
if (*Name->Buffer == L'\\') {
|
|
//
|
|
// Skip the \ in the buffer moving forward a character and adjusting
|
|
// the length
|
|
//
|
|
foundSlash = TRUE;
|
|
Name->Buffer++;
|
|
Name->Length -= sizeof(WCHAR);
|
|
break;
|
|
}
|
|
|
|
//
|
|
// Move backwards in the string
|
|
//
|
|
Name->Buffer--;
|
|
Name->Length += sizeof(WCHAR);
|
|
}
|
|
|
|
if (foundSlash && Name->Length == 0) {
|
|
//
|
|
// Handle the case where a slash was found and it is the only character
|
|
//
|
|
Name->Buffer = NULL;
|
|
}
|
|
else if (foundSlash == FALSE) {
|
|
//
|
|
// Handle the case where no slash was found. In this case, Name->Buffer
|
|
// points to one WCHAR before the beginning of the string.
|
|
//
|
|
Name->Length -= sizeof(WCHAR);
|
|
Name->Buffer++;
|
|
}
|
|
|
|
//
|
|
// Need to set MaximumLength to the same value as Length so that the struct
|
|
// format is valid.
|
|
//
|
|
Name->MaximumLength = Name->Length;
|
|
}
|
|
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|