filesup.c

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/*
 * PROJECT:     ReactOS Setup Library
 * LICENSE:     GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
 * PURPOSE:     File support functions.
 * COPYRIGHT:   Casper S. Hornstrup (chorns@users.sourceforge.net)
 *              Copyright 2017-2018 Hermes Belusca-Maito
 */
 
/* INCLUDES *****************************************************************/
 
#include "precomp.h"
#include "filesup.h"
 
#define NDEBUG
#include <debug.h>
 
 
// ACHTUNG! HAXX FIXME!!
#define _SEH2_TRY
#define _SEH2_LEAVE     goto __SEH2_FINALLY__label;
#define _SEH2_FINALLY   __SEH2_FINALLY__label:
#define _SEH2_END
 
 
/* FUNCTIONS ****************************************************************/
 
static
NTSTATUS
SetupCreateSingleDirectory(
    _In_ PCUNICODE_STRING DirectoryName)
{
    NTSTATUS Status;
    UNICODE_STRING PathName = *DirectoryName;
    OBJECT_ATTRIBUTES ObjectAttributes;
    IO_STATUS_BLOCK IoStatusBlock;
    HANDLE DirectoryHandle;
 
    /* Remove the trailing separator if needed */
    if (PathName.Length >= 2 * sizeof(WCHAR) &&
        PathName.Buffer[PathName.Length / sizeof(WCHAR) - 1] == OBJ_NAME_PATH_SEPARATOR)
    {
        PathName.Length -= sizeof(WCHAR);
    }
 
    InitializeObjectAttributes(&ObjectAttributes,
                               &PathName,
                               OBJ_CASE_INSENSITIVE,
                               NULL,
                               NULL);
 
    Status = NtCreateFile(&DirectoryHandle,
                          FILE_LIST_DIRECTORY | SYNCHRONIZE,
                          &ObjectAttributes,
                          &IoStatusBlock,
                          NULL,
                          FILE_ATTRIBUTE_DIRECTORY,
                          FILE_SHARE_READ | FILE_SHARE_WRITE,
                          FILE_OPEN_IF,
                          FILE_OPEN_FOR_BACKUP_INTENT | FILE_DIRECTORY_FILE,
                          NULL,
                          0);
    if (NT_SUCCESS(Status))
        NtClose(DirectoryHandle);
 
    return Status;
}
 
NTSTATUS
SetupCreateDirectory(
    _In_ PCWSTR PathName)
{
    NTSTATUS Status = STATUS_SUCCESS;
    UNICODE_STRING PathNameU;
    PCWSTR Buffer;
    PCWCH Ptr, End;
 
    RtlInitUnicodeString(&PathNameU, PathName);
    Buffer = PathNameU.Buffer;
    End = Buffer + (PathNameU.Length / sizeof(WCHAR));
 
    /* Find the deepest existing sub-directory: start from the
     * end and go back, verifying each sub-directory in turn */
    for (Ptr = End; Ptr > Buffer;)
    {
        BOOLEAN bExists;
 
        /* If we are on a separator, truncate at the next character.
         * The trailing separator is kept for the existence check. */
        if ((Ptr < End) && (*Ptr == OBJ_NAME_PATH_SEPARATOR))
            PathNameU.Length = (ULONG_PTR)(Ptr+1) - (ULONG_PTR)Buffer;
 
        /* Check if the sub-directory exists and stop
         * if so: this is the deepest existing one */
        DPRINT("PathName: %wZ\n", &PathNameU);
        bExists = DoesPathExist_UStr(NULL, &PathNameU, TRUE);
        if (bExists)
            break;
 
        /* Skip back any consecutive path separators */
        while ((Ptr > Buffer) && (*Ptr == OBJ_NAME_PATH_SEPARATOR))
            --Ptr;
        /* Go to the beginning of the path component, stop at the separator */
        while ((Ptr > Buffer) && (*Ptr != OBJ_NAME_PATH_SEPARATOR))
            --Ptr;
    }
 
    /* Skip any consecutive path separators */
    while ((Ptr < End) && (*Ptr == OBJ_NAME_PATH_SEPARATOR))
        ++Ptr;
 
    /* Create all the remaining sub-directories */
    for (; Ptr < End; ++Ptr)
    {
        /* Go to the end of the current path component, stop at
         * the separator or terminating NUL and truncate it */
        while ((Ptr < End) && (*Ptr != OBJ_NAME_PATH_SEPARATOR))
            ++Ptr;
        PathNameU.Length = (ULONG_PTR)Ptr - (ULONG_PTR)Buffer;
 
        DPRINT("Create: %wZ\n", &PathNameU);
        Status = SetupCreateSingleDirectory(&PathNameU);
        if (!NT_SUCCESS(Status))
            break;
    }
 
    DPRINT("Done.\n");
    return Status;
}
 
NTSTATUS
SetupDeleteFile(
    IN PCWSTR FileName,
    IN BOOLEAN ForceDelete) // ForceDelete can be used to delete read-only files
{
    NTSTATUS Status;
    UNICODE_STRING NtPathU;
    OBJECT_ATTRIBUTES ObjectAttributes;
    IO_STATUS_BLOCK IoStatusBlock;
    HANDLE FileHandle;
    FILE_DISPOSITION_INFORMATION FileDispInfo;
    BOOLEAN RetryOnce = FALSE;
 
    /* Open the directory name that was passed in */
    RtlInitUnicodeString(&NtPathU, FileName);
    InitializeObjectAttributes(&ObjectAttributes,
                               &NtPathU,
                               OBJ_CASE_INSENSITIVE,
                               NULL,
                               NULL);
 
Retry: // We go back there once if RetryOnce == TRUE
    Status = NtOpenFile(&FileHandle,
                        DELETE | FILE_READ_ATTRIBUTES |
                        (RetryOnce ? FILE_WRITE_ATTRIBUTES : 0),
                        &ObjectAttributes,
                        &IoStatusBlock,
                        FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
                        FILE_NON_DIRECTORY_FILE | FILE_OPEN_FOR_BACKUP_INTENT);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("NtOpenFile failed with Status 0x%08lx\n", Status);
        return Status;
    }
 
    if (RetryOnce)
    {
        FILE_BASIC_INFORMATION FileInformation;
 
        Status = NtQueryInformationFile(FileHandle,
                                        &IoStatusBlock,
                                        &FileInformation,
                                        sizeof(FILE_BASIC_INFORMATION),
                                        FileBasicInformation);
        if (!NT_SUCCESS(Status))
        {
            DPRINT1("NtQueryInformationFile failed with Status 0x%08lx\n", Status);
            NtClose(FileHandle);
            return Status;
        }
 
        FileInformation.FileAttributes = FILE_ATTRIBUTE_NORMAL;
        Status = NtSetInformationFile(FileHandle,
                                      &IoStatusBlock,
                                      &FileInformation,
                                      sizeof(FILE_BASIC_INFORMATION),
                                      FileBasicInformation);
        NtClose(FileHandle);
        if (!NT_SUCCESS(Status))
        {
            DPRINT1("NtSetInformationFile failed with Status 0x%08lx\n", Status);
            return Status;
        }
    }
 
    /* Ask for the file to be deleted */
    FileDispInfo.DeleteFile = TRUE;
    Status = NtSetInformationFile(FileHandle,
                                  &IoStatusBlock,
                                  &FileDispInfo,
                                  sizeof(FILE_DISPOSITION_INFORMATION),
                                  FileDispositionInformation);
    NtClose(FileHandle);
 
    if (!NT_SUCCESS(Status))
        DPRINT1("Deletion of file '%S' failed, Status 0x%08lx\n", FileName, Status);
 
    // FIXME: Check the precise value of Status!
    if (!NT_SUCCESS(Status) && ForceDelete && !RetryOnce)
    {
        /* Retry once */
        RetryOnce = TRUE;
        goto Retry;
    }
 
    /* Return result to the caller */
    return Status;
}
 
NTSTATUS
SetupCopyFile(
    IN PCWSTR SourceFileName,
    IN PCWSTR DestinationFileName,
    IN BOOLEAN FailIfExists)
{
    NTSTATUS Status;
    UNICODE_STRING FileName;
    OBJECT_ATTRIBUTES ObjectAttributes;
    HANDLE FileHandleSource;
    HANDLE FileHandleDest;
    IO_STATUS_BLOCK IoStatusBlock;
    FILE_STANDARD_INFORMATION FileStandard;
    FILE_BASIC_INFORMATION FileBasic;
    ULONG RegionSize;
    HANDLE SourceFileSection;
    PVOID SourceFileMap = NULL;
    SIZE_T SourceSectionSize = 0;
    LARGE_INTEGER ByteOffset;
 
    RtlInitUnicodeString(&FileName, SourceFileName);
    InitializeObjectAttributes(&ObjectAttributes,
                               &FileName,
                               OBJ_CASE_INSENSITIVE,
                               NULL,
                               NULL);
 
    Status = NtOpenFile(&FileHandleSource,
                        GENERIC_READ,
                        &ObjectAttributes,
                        &IoStatusBlock,
                        FILE_SHARE_READ,
                        FILE_SEQUENTIAL_ONLY);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("NtOpenFile failed: %x, %wZ\n", Status, &FileName);
        goto done;
    }
 
    Status = NtQueryInformationFile(FileHandleSource,
                                    &IoStatusBlock,
                                    &FileStandard,
                                    sizeof(FILE_STANDARD_INFORMATION),
                                    FileStandardInformation);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("NtQueryInformationFile failed: %x\n", Status);
        goto closesrc;
    }
 
    Status = NtQueryInformationFile(FileHandleSource,
                                    &IoStatusBlock,
                                    &FileBasic,
                                    sizeof(FILE_BASIC_INFORMATION),
                                    FileBasicInformation);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("NtQueryInformationFile failed: %x\n", Status);
        goto closesrc;
    }
 
    Status = NtCreateSection(&SourceFileSection,
                             SECTION_MAP_READ,
                             NULL,
                             NULL,
                             PAGE_READONLY,
                             SEC_COMMIT,
                             FileHandleSource);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("NtCreateSection failed: %x, %S\n", Status, SourceFileName);
        goto closesrc;
    }
 
    Status = NtMapViewOfSection(SourceFileSection,
                                NtCurrentProcess(),
                                &SourceFileMap,
                                0,
                                0,
                                NULL,
                                &SourceSectionSize,
                                ViewUnmap,
                                0,
                                PAGE_READONLY);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("NtMapViewOfSection failed: %x, %S\n", Status, SourceFileName);
        goto closesrcsec;
    }
 
    RtlInitUnicodeString(&FileName, DestinationFileName);
    InitializeObjectAttributes(&ObjectAttributes,
                               &FileName,
                               OBJ_CASE_INSENSITIVE,
                               NULL,
                               NULL);
 
    Status = NtCreateFile(&FileHandleDest,
                          GENERIC_WRITE | SYNCHRONIZE,
                          &ObjectAttributes,
                          &IoStatusBlock,
                          NULL,
                          FileBasic.FileAttributes, // FILE_ATTRIBUTE_NORMAL,
                          0,
                          FailIfExists ? FILE_CREATE : FILE_OVERWRITE_IF,
                          FILE_NO_INTERMEDIATE_BUFFERING |
                          FILE_SEQUENTIAL_ONLY |
                          FILE_SYNCHRONOUS_IO_NONALERT,
                          NULL,
                          0);
    if (!NT_SUCCESS(Status))
    {
        /*
         * Open may have failed because the file to overwrite
         * is in readonly mode.
         */
        if (Status == STATUS_ACCESS_DENIED)
        {
            FILE_BASIC_INFORMATION FileBasicInfo;
 
            /* Reattempt to open it with limited access */
            Status = NtCreateFile(&FileHandleDest,
                                  FILE_WRITE_ATTRIBUTES | SYNCHRONIZE,
                                  &ObjectAttributes,
                                  &IoStatusBlock,
                                  NULL,
                                  FILE_ATTRIBUTE_NORMAL,
                                  0,
                                  FILE_OPEN,
                                  FILE_NO_INTERMEDIATE_BUFFERING |
                                  FILE_SEQUENTIAL_ONLY |
                                  FILE_SYNCHRONOUS_IO_NONALERT,
                                  NULL,
                                  0);
            /* Fail for real if we cannot open it that way */
            if (!NT_SUCCESS(Status))
            {
                DPRINT1("NtCreateFile failed: %x, %wZ\n", Status, &FileName);
                goto unmapsrcsec;
            }
 
            /* Zero our basic info, just to set attributes */
            RtlZeroMemory(&FileBasicInfo, sizeof(FileBasicInfo));
            /* Reset attributes to normal, no read-only */
            FileBasicInfo.FileAttributes = FILE_ATTRIBUTE_NORMAL;
            /*
             * We basically don't care about whether it succeed:
             * if it didn't, later open will fail.
             */
            NtSetInformationFile(FileHandleDest, &IoStatusBlock, &FileBasicInfo,
                                 sizeof(FileBasicInfo), FileBasicInformation);
 
            /* Close file */
            NtClose(FileHandleDest);
 
            /* And re-attempt overwrite */
            Status = NtCreateFile(&FileHandleDest,
                                  GENERIC_WRITE | SYNCHRONIZE,
                                  &ObjectAttributes,
                                  &IoStatusBlock,
                                  NULL,
                                  FILE_ATTRIBUTE_NORMAL,
                                  0,
                                  FILE_OVERWRITE_IF,
                                  FILE_NO_INTERMEDIATE_BUFFERING |
                                  FILE_SEQUENTIAL_ONLY |
                                  FILE_SYNCHRONOUS_IO_NONALERT,
                                  NULL,
                                  0);
        }
 
        /* We failed */
        if (!NT_SUCCESS(Status))
        {
            DPRINT1("NtCreateFile failed: %x, %wZ\n", Status, &FileName);
            goto unmapsrcsec;
        }
    }
 
    RegionSize = (ULONG)PAGE_ROUND_UP(FileStandard.EndOfFile.u.LowPart);
    IoStatusBlock.Status = 0;
    ByteOffset.QuadPart = 0ULL;
    Status = NtWriteFile(FileHandleDest,
                         NULL,
                         NULL,
                         NULL,
                         &IoStatusBlock,
                         SourceFileMap,
                         RegionSize,
                         &ByteOffset,
                         NULL);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("NtWriteFile failed: %x:%x, iosb: %p src: %p, size: %x\n",
                Status, IoStatusBlock.Status, &IoStatusBlock, SourceFileMap, RegionSize);
        goto closedest;
    }
 
    /* Copy file date/time from source file */
    Status = NtSetInformationFile(FileHandleDest,
                                  &IoStatusBlock,
                                  &FileBasic,
                                  sizeof(FILE_BASIC_INFORMATION),
                                  FileBasicInformation);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("NtSetInformationFile failed: %x\n", Status);
        goto closedest;
    }
 
    /* Shorten the file back to its real size after completing the write */
    Status = NtSetInformationFile(FileHandleDest,
                                  &IoStatusBlock,
                                  &FileStandard.EndOfFile,
                                  sizeof(FILE_END_OF_FILE_INFORMATION),
                                  FileEndOfFileInformation);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("NtSetInformationFile failed: %x\n", Status);
    }
 
closedest:
    NtClose(FileHandleDest);
 
unmapsrcsec:
    NtUnmapViewOfSection(NtCurrentProcess(), SourceFileMap);
 
closesrcsec:
    NtClose(SourceFileSection);
 
closesrc:
    NtClose(FileHandleSource);
 
done:
    return Status;
}
 
/*
 * Synchronized with its kernel32 counterpart, but we don't manage reparse points here.
 */
NTSTATUS
SetupMoveFile(
    IN PCWSTR ExistingFileName,
    IN PCWSTR NewFileName,
    IN ULONG Flags)
{
    NTSTATUS Status;
    IO_STATUS_BLOCK IoStatusBlock;
    OBJECT_ATTRIBUTES ObjectAttributes;
    PFILE_RENAME_INFORMATION RenameInfo;
    UNICODE_STRING NewPathU, ExistingPathU;
    HANDLE SourceHandle = NULL;
    BOOLEAN ReplaceIfExists;
 
    RtlInitUnicodeString(&ExistingPathU, ExistingFileName);
    RtlInitUnicodeString(&NewPathU, NewFileName);
 
    _SEH2_TRY
    {
        ReplaceIfExists = !!(Flags & MOVEFILE_REPLACE_EXISTING);
 
        /* Unless we manage a proper opening, we'll attempt to reopen without reparse support */
        InitializeObjectAttributes(&ObjectAttributes,
                                   &ExistingPathU,
                                   OBJ_CASE_INSENSITIVE,
                                   NULL,
                                   NULL);
        /* Attempt to open source file */
        Status = NtOpenFile(&SourceHandle,
                            FILE_READ_ATTRIBUTES | DELETE | SYNCHRONIZE,
                            &ObjectAttributes,
                            &IoStatusBlock,
                            FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
                            FILE_OPEN_FOR_BACKUP_INTENT | ((Flags & MOVEFILE_WRITE_THROUGH) ? FILE_WRITE_THROUGH : 0));
        if (!NT_SUCCESS(Status))
        {
            if (Status != STATUS_INVALID_PARAMETER)
            {
                _SEH2_LEAVE;
            }
        }
 
        /* At that point, we MUST have a source handle */
        ASSERT(SourceHandle);
 
        /* Allocate renaming buffer and fill it */
        RenameInfo = RtlAllocateHeap(RtlGetProcessHeap(), 0, NewPathU.Length + sizeof(FILE_RENAME_INFORMATION));
        if (RenameInfo == NULL)
        {
            Status = STATUS_NO_MEMORY;
            _SEH2_LEAVE;
        }
 
        RtlCopyMemory(&RenameInfo->FileName, NewPathU.Buffer, NewPathU.Length);
        RenameInfo->ReplaceIfExists = ReplaceIfExists;
        RenameInfo->RootDirectory = NULL;
        RenameInfo->FileNameLength = NewPathU.Length;
 
        /* Attempt to rename the file */
        Status = NtSetInformationFile(SourceHandle,
                                      &IoStatusBlock,
                                      RenameInfo,
                                      NewPathU.Length + sizeof(FILE_RENAME_INFORMATION),
                                      FileRenameInformation);
        RtlFreeHeap(RtlGetProcessHeap(), 0, RenameInfo);
        if (NT_SUCCESS(Status))
        {
            /* If it succeeded, all fine, quit */
            _SEH2_LEAVE;
        }
        /*
         * If we failed for any other reason than not the same device, fail.
         * If we failed because of different devices, only allow renaming
         * if user allowed copy.
         */
        if (Status != STATUS_NOT_SAME_DEVICE || !(Flags & MOVEFILE_COPY_ALLOWED))
        {
            /* ReactOS hack! To be removed once all FSD have proper renaming support
             * Just leave status to error and leave
             */
            if (Status == STATUS_NOT_IMPLEMENTED)
            {
                DPRINT1("Forcing copy, renaming not supported by FSD\n");
            }
            else
            {
                _SEH2_LEAVE;
            }
        }
 
        /* Close the source file */
        NtClose(SourceHandle);
        SourceHandle = NULL;
 
        /* Perform the file copy */
        Status = SetupCopyFile(ExistingFileName,
                               NewFileName,
                               !ReplaceIfExists);
 
        /* If it succeeded, delete the source file */
        if (NT_SUCCESS(Status))
        {
            /* Force-delete files even if read-only */
            SetupDeleteFile(ExistingFileName, TRUE);
        }
    }
    _SEH2_FINALLY
    {
        if (SourceHandle)
            NtClose(SourceHandle);
    }
    _SEH2_END;
 
    return Status;
}
 
NTSTATUS
ConcatPathsV(
    IN OUT PWSTR PathBuffer,
    IN SIZE_T cchPathSize,
    IN ULONG NumberOfPathComponents,
    IN va_list PathComponentsList)
{
    NTSTATUS Status = STATUS_SUCCESS;
    SIZE_T cchPathLen;
    PCWSTR PathComponent;
 
    if (cchPathSize < 1)
        return STATUS_SUCCESS;
 
    while (NumberOfPathComponents--)
    {
        PathComponent = va_arg(PathComponentsList, PCWSTR);
        if (!PathComponent)
            continue;
 
        cchPathLen = min(cchPathSize, wcslen(PathBuffer));
        if (cchPathLen >= cchPathSize)
            return STATUS_BUFFER_OVERFLOW;
 
        if (PathComponent[0] != OBJ_NAME_PATH_SEPARATOR &&
            cchPathLen > 0 && PathBuffer[cchPathLen-1] != OBJ_NAME_PATH_SEPARATOR)
        {
            /* PathComponent does not start with '\' and PathBuffer does not end with '\' */
            Status = RtlStringCchCatW(PathBuffer, cchPathSize, L"\\");
            if (!NT_SUCCESS(Status))
                return Status;
        }
        else if (PathComponent[0] == OBJ_NAME_PATH_SEPARATOR &&
                 cchPathLen > 0 && PathBuffer[cchPathLen-1] == OBJ_NAME_PATH_SEPARATOR)
        {
            /* PathComponent starts with '\' and PathBuffer ends with '\' */
            while (*PathComponent == OBJ_NAME_PATH_SEPARATOR)
                ++PathComponent; // Skip any backslash
        }
        Status = RtlStringCchCatW(PathBuffer, cchPathSize, PathComponent);
        if (!NT_SUCCESS(Status))
            return Status;
    }
 
    return Status;
}
 
NTSTATUS
CombinePathsV(
    OUT PWSTR PathBuffer,
    IN SIZE_T cchPathSize,
    IN ULONG NumberOfPathComponents,
    IN va_list PathComponentsList)
{
    if (cchPathSize < 1)
        return STATUS_SUCCESS;
 
    *PathBuffer = UNICODE_NULL;
    return ConcatPathsV(PathBuffer, cchPathSize,
                        NumberOfPathComponents,
                        PathComponentsList);
}
 
NTSTATUS
ConcatPaths(
    IN OUT PWSTR PathBuffer,
    IN SIZE_T cchPathSize,
    IN ULONG NumberOfPathComponents,
    IN /* PCWSTR */ ...)
{
    NTSTATUS Status;
    va_list PathComponentsList;
 
    if (cchPathSize < 1)
        return STATUS_SUCCESS;
 
    va_start(PathComponentsList, NumberOfPathComponents);
    Status = ConcatPathsV(PathBuffer, cchPathSize,
                          NumberOfPathComponents,
                          PathComponentsList);
    va_end(PathComponentsList);
 
    return Status;
}
 
NTSTATUS
CombinePaths(
    OUT PWSTR PathBuffer,
    IN SIZE_T cchPathSize,
    IN ULONG NumberOfPathComponents,
    IN /* PCWSTR */ ...)
{
    NTSTATUS Status;
    va_list PathComponentsList;
 
    if (cchPathSize < 1)
        return STATUS_SUCCESS;
 
    *PathBuffer = UNICODE_NULL;
 
    va_start(PathComponentsList, NumberOfPathComponents);
    Status = CombinePathsV(PathBuffer, cchPathSize,
                           NumberOfPathComponents,
                           PathComponentsList);
    va_end(PathComponentsList);
 
    return Status;
}
 
BOOLEAN
DoesPathExist_UStr(
    _In_opt_ HANDLE RootDirectory,
    _In_ PCUNICODE_STRING PathName,
    _In_ BOOLEAN IsDirectory)
{
    NTSTATUS Status;
    HANDLE FileHandle;
    OBJECT_ATTRIBUTES ObjectAttributes;
    IO_STATUS_BLOCK IoStatusBlock;
 
    InitializeObjectAttributes(&ObjectAttributes,
                               (PUNICODE_STRING)PathName,
                               OBJ_CASE_INSENSITIVE,
                               RootDirectory,
                               NULL);
 
    Status = NtOpenFile(&FileHandle,
                        IsDirectory ? (FILE_LIST_DIRECTORY | SYNCHRONIZE)
                                    :  FILE_GENERIC_READ, // Contains SYNCHRONIZE
                        &ObjectAttributes,
                        &IoStatusBlock,
                        FILE_SHARE_READ | FILE_SHARE_WRITE,
                        FILE_SYNCHRONOUS_IO_NONALERT |
                            (IsDirectory ? FILE_DIRECTORY_FILE
                                         : FILE_NON_DIRECTORY_FILE));
    if (NT_SUCCESS(Status))
    {
        NtClose(FileHandle);
    }
    else
    {
        DPRINT("Failed to open %s '%wZ', Status 0x%08lx\n",
               IsDirectory ? "directory" : "file",
               PathName, Status);
    }
 
    return NT_SUCCESS(Status);
}
 
BOOLEAN
DoesPathExist(
    _In_opt_ HANDLE RootDirectory,
    _In_ PCWSTR PathName,
    _In_ BOOLEAN IsDirectory)
{
    UNICODE_STRING PathNameU;
    RtlInitUnicodeString(&PathNameU, PathName);
    return DoesPathExist_UStr(RootDirectory, &PathNameU, IsDirectory);
}
 
// FIXME: DEPRECATED! HACKish function that needs to be deprecated!
BOOLEAN
DoesFileExist_2(
    IN PCWSTR PathName OPTIONAL,
    IN PCWSTR FileName)
{
    WCHAR FullName[MAX_PATH];
    CombinePaths(FullName, ARRAYSIZE(FullName), 2, PathName, FileName);
    return DoesFileExist(NULL, FullName);
}
 
/*
 * The format of NtPath should be:
 *    \Device\HarddiskXXX\PartitionYYY[\path] ,
 * where XXX and YYY respectively represent the hard disk and partition numbers,
 * and [\path] represent an optional path (separated by '\\').
 *
 * If a NT path of such a form is correctly parsed, the function returns respectively:
 * - in pDiskNumber: the hard disk number XXX,
 * - in pPartNumber: the partition number YYY,
 * - in PathComponent: pointer value (inside NtPath) to the beginning of \path.
 *
 * NOTE: The function does not accept leading whitespace.
 */
BOOLEAN
NtPathToDiskPartComponents(
    IN PCWSTR NtPath,
    OUT PULONG pDiskNumber,
    OUT PULONG pPartNumber,
    OUT PCWSTR* PathComponent OPTIONAL)
{
    ULONG DiskNumber, PartNumber;
    PCWSTR Path;
 
    *pDiskNumber = 0;
    *pPartNumber = 0;
    if (PathComponent) *PathComponent = NULL;
 
    Path = NtPath;
 
    if (_wcsnicmp(Path, L"\\Device\\Harddisk", 16) != 0)
    {
        /* The NT path doesn't start with the prefix string, thus it cannot be a hard disk device path */
        DPRINT1("'%S' : Not a possible hard disk device.\n", NtPath);
        return FALSE;
    }
 
    Path += 16;
 
    /* A number must be present now */
    if (!iswdigit(*Path))
    {
        DPRINT1("'%S' : expected a number! Not a regular hard disk device.\n", Path);
        return FALSE;
    }
    DiskNumber = wcstoul(Path, (PWSTR*)&Path, 10);
 
    /* Either NULL termination, or a path separator must be present now */
    if (*Path && *Path != OBJ_NAME_PATH_SEPARATOR)
    {
        DPRINT1("'%S' : expected a path separator!\n", Path);
        return FALSE;
    }
 
    if (!*Path)
    {
        DPRINT1("The path only specified a hard disk (and nothing else, like a partition...), so we stop there.\n");
        goto Quit;
    }
 
    /* Here, *Path == L'\\' */
 
    if (_wcsnicmp(Path, L"\\Partition", 10) != 0)
    {
        /* Actually, \Partition is optional so, if we don't have it, we still return success. Or should we? */
        DPRINT1("'%S' : unexpected format!\n", NtPath);
        goto Quit;
    }
 
    Path += 10;
 
    /* A number must be present now */
    if (!iswdigit(*Path))
    {
        /* If we don't have a number it means this part of path is actually not a partition specifier, so we shouldn't fail either. Or should we? */
        DPRINT1("'%S' : expected a number!\n", Path);
        goto Quit;
    }
    PartNumber = wcstoul(Path, (PWSTR*)&Path, 10);
 
    /* Either NULL termination, or a path separator must be present now */
    if (*Path && *Path != OBJ_NAME_PATH_SEPARATOR)
    {
        /* We shouldn't fail here because it just means this part of path is actually not a partition specifier. Or should we? */
        DPRINT1("'%S' : expected a path separator!\n", Path);
        goto Quit;
    }
 
    /* OK, here we really have a partition specifier: return its number */
    *pPartNumber = PartNumber;
 
Quit:
    /* Return the disk number */
    *pDiskNumber = DiskNumber;
 
    /* Return the path component also, if the user wants it */
    if (PathComponent) *PathComponent = Path;
 
    return TRUE;
}
 
NTSTATUS
OpenAndMapFile(
    _In_opt_ HANDLE RootDirectory,
    _In_ PCWSTR PathNameToFile,
    _Out_opt_ PHANDLE FileHandle,
    _Out_opt_ PULONG FileSize,
    _Out_ PHANDLE SectionHandle,
    _Out_ PVOID* BaseAddress,
    _In_ BOOLEAN ReadWriteAccess)
{
    NTSTATUS Status;
    UNICODE_STRING FileName;
    OBJECT_ATTRIBUTES ObjectAttributes;
    IO_STATUS_BLOCK IoStatusBlock;
    HANDLE LocalFileHandle;
 
    /* Open the file */
    RtlInitUnicodeString(&FileName, PathNameToFile);
    InitializeObjectAttributes(&ObjectAttributes,
                               &FileName,
                               OBJ_CASE_INSENSITIVE,
                               RootDirectory,
                               NULL);
 
    if (FileHandle) *FileHandle = NULL;
    Status = NtOpenFile(&LocalFileHandle,
                        FILE_GENERIC_READ | // Contains SYNCHRONIZE
                            (ReadWriteAccess ? FILE_GENERIC_WRITE : 0),
                        &ObjectAttributes,
                        &IoStatusBlock,
                        FILE_SHARE_READ,
                        FILE_SYNCHRONOUS_IO_NONALERT | FILE_NON_DIRECTORY_FILE);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("Failed to open file '%wZ' (Status 0x%08lx)\n", &FileName, Status);
        return Status;
    }
 
    if (FileSize)
    {
        /* Query the file size */
        FILE_STANDARD_INFORMATION FileInfo;
        Status = NtQueryInformationFile(LocalFileHandle,
                                        &IoStatusBlock,
                                        &FileInfo,
                                        sizeof(FileInfo),
                                        FileStandardInformation);
        if (!NT_SUCCESS(Status))
        {
            DPRINT("NtQueryInformationFile() failed (Status 0x%08lx)\n", Status);
            goto Quit;
        }
 
        if (FileInfo.EndOfFile.HighPart != 0)
            DPRINT1("WARNING!! The file '%wZ' is too large!\n", &FileName);
 
        *FileSize = FileInfo.EndOfFile.LowPart;
        DPRINT("File size: %lu\n", *FileSize);
    }
 
    /* Map the whole file into memory */
    Status = MapFile(LocalFileHandle,
                     SectionHandle,
                     BaseAddress,
                     ReadWriteAccess);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("Failed to map file '%wZ' (Status 0x%08lx)\n", &FileName, Status);
        goto Quit;
    }
 
Quit:
    /* If we succeeded, return the opened file handle if needed.
     * If we failed or the caller does not need the handle, close it now. */
    if (NT_SUCCESS(Status) && FileHandle)
        *FileHandle = LocalFileHandle;
    else
        NtClose(LocalFileHandle);
 
    return Status;
}
 
NTSTATUS
MapFile(
    _In_ HANDLE FileHandle,
    _Out_ PHANDLE SectionHandle,
    _Out_ PVOID* BaseAddress,
    _In_ BOOLEAN ReadWriteAccess)
{
    NTSTATUS Status;
    ULONG SectionPageProtection;
    SIZE_T ViewSize;
    PVOID ViewBase;
 
    SectionPageProtection = (ReadWriteAccess ? PAGE_READWRITE : PAGE_READONLY);
 
    /* Create the section */
    *SectionHandle = NULL;
    Status = NtCreateSection(SectionHandle,
                             STANDARD_RIGHTS_REQUIRED | SECTION_QUERY |
                             SECTION_MAP_READ |
                                (ReadWriteAccess ? SECTION_MAP_WRITE : 0),
                             NULL,
                             NULL,
                             SectionPageProtection,
                             SEC_COMMIT /* | SEC_IMAGE (_NO_EXECUTE) */,
                             FileHandle);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("Failed to create a memory section for file 0x%p (Status 0x%08lx)\n",
                FileHandle, Status);
        return Status;
    }
 
    /* Map the section */
    ViewSize = 0;
    ViewBase = NULL;
    Status = NtMapViewOfSection(*SectionHandle,
                                NtCurrentProcess(),
                                &ViewBase,
                                0, 0,
                                NULL,
                                &ViewSize,
                                ViewShare,
                                0,
                                SectionPageProtection);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("Failed to map a view for file 0x%p (Status 0x%08lx)\n",
                FileHandle, Status);
        NtClose(*SectionHandle);
        *SectionHandle = NULL;
        return Status;
    }
 
    *BaseAddress = ViewBase;
    return STATUS_SUCCESS;
}
 
BOOLEAN
UnMapFile(
    _In_ HANDLE SectionHandle,
    _In_ PVOID BaseAddress)
{
    NTSTATUS Status;
    BOOLEAN Success = TRUE;
 
    Status = NtUnmapViewOfSection(NtCurrentProcess(), BaseAddress);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("NtUnmapViewOfSection(0x%p) failed (Status 0x%08lx)\n",
                BaseAddress, Status);
        Success = FALSE;
    }
    Status = NtClose(SectionHandle);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("NtClose(0x%p) failed (Status 0x%08lx)\n",
                SectionHandle, Status);
        Success = FALSE;
    }
 
    return Success;
}
 
/* EOF */