windows-server-2003/base/eventlog/server/copy.c

/*++

Copyright (c) 1989  Microsoft Corporation

Module Name:

    copy.c

Abstract:

    This module contains the routine to copy a file.

Author:

    Dan Hinsley (DanHi) 24-Feb-1991

Revision History:

    02-Feb-1994     Danl
        Fixed memory leak where ioBuffer wasn't getting free'd when doing
        an error exit from ElfpCopyFile.

--*/

//
// INCLUDES
//

#include <eventp.h>


NTSTATUS
ElfpCopyFile (
    IN HANDLE SourceHandle,
    IN PUNICODE_STRING TargetFileName
    )

/*++

Routine Description:

    This routine copies or appends from the source file to the target file.
    If the target file already exists, the copy fails.

Arguments:

    SourceHandle - An open handle to the source file.

    TargetFileName - The name of the file to copy to.


Return Value:

    NTSTATUS - STATUS_SUCCESS or error.

--*/

{
    NTSTATUS Status;

    IO_STATUS_BLOCK IoStatusBlock;
    FILE_STANDARD_INFORMATION sourceStandardInfo;

    OBJECT_ATTRIBUTES ObjectAttributes;
    HANDLE TargetHandle;

    PCHAR ioBuffer;
    ULONG ioBufferSize;
    ULONG bytesRead;

    //
    // Get the size of the file so we can set the attributes of the target
    // file.
    //
    Status = NtQueryInformationFile(
                 SourceHandle,
                 &IoStatusBlock,
                 &sourceStandardInfo,
                 sizeof(sourceStandardInfo),
                 FileStandardInformation
                 );

    if (!NT_SUCCESS(Status))
    {
        ELF_LOG1(ERROR,
                 "ElfpCopyFile: Unable to query size of source file %#x\n",
                 Status);

        return Status;
    }

    //
    // Open the target file, fail if the file already exists.
    //

    InitializeObjectAttributes(
                    &ObjectAttributes,
                    TargetFileName,
                    OBJ_CASE_INSENSITIVE,
                    NULL,
                    NULL
                    );

    Status = NtCreateFile(&TargetHandle,
                          GENERIC_WRITE | SYNCHRONIZE,
                          &ObjectAttributes,
                          &IoStatusBlock,
                          &(sourceStandardInfo.EndOfFile),
                          FILE_ATTRIBUTE_NORMAL,
                          0,                       // Share access
                          FILE_CREATE,
                          FILE_SYNCHRONOUS_IO_ALERT | FILE_SEQUENTIAL_ONLY,
                          NULL,                    // EA buffer
                          0);                      // EA length

    if (!NT_SUCCESS(Status))
    {
        ELF_LOG2(ERROR,
                 "ElfpCopyFile: NtCreateFile of file %ws failed %#x\n",
                 TargetFileName->Buffer,
                 Status);

        return Status;
    }

    //
    // Allocate a buffer to use for the data copy.
    //
    ioBufferSize = 4096;

    ioBuffer = ElfpAllocateBuffer (ioBufferSize);

    if (ioBuffer == NULL)
    {
        ELF_LOG1(ERROR,
                 "ElfpCopyFile: Unable to allocate I/O buffer to copy file %ws\n",
                 TargetFileName->Buffer);

        NtClose(TargetHandle);
        return STATUS_NO_MEMORY;
    }

    //
    // Copy data--read from source, write to target.  Do this until
    // all the data is written or an error occurs.
    //
    while ( TRUE )
    {
        Status = NtReadFile(
                         SourceHandle,
                         NULL,                // Event
                         NULL,                // ApcRoutine
                         NULL,                // ApcContext
                         &IoStatusBlock,
                         ioBuffer,
                         ioBufferSize,
                         NULL,                // ByteOffset
                         NULL);               // Key

        if (!NT_SUCCESS(Status) && Status != STATUS_END_OF_FILE)
        {
            ELF_LOG1(ERROR,
                     "ElfpCopyFile: NtReadFile of source file failed %#x\n",
                     Status);

            ElfpFreeBuffer(ioBuffer);
            NtClose(TargetHandle);
            return Status;
        }

        if (IoStatusBlock.Information == 0 || Status == STATUS_END_OF_FILE)
        {
            break;
        }

        bytesRead = (ULONG)IoStatusBlock.Information;

        Status = NtWriteFile(
                          TargetHandle,
                          NULL,               // Event
                          NULL,               // ApcRoutine
                          NULL,               // ApcContext
                          &IoStatusBlock,
                          ioBuffer,
                          bytesRead,
                          NULL,               // ByteOffset
                          NULL);              // Key

        if (!NT_SUCCESS(Status))
        {
            ELF_LOG2(ERROR,
                     "ElfpCopyFile: NtWriteFile to file %ws failed %#x\n",
                     TargetFileName->Buffer,
                     Status);

            ElfpFreeBuffer(ioBuffer);
            NtClose(TargetHandle);
            return Status;
        }
    }

    ElfpFreeBuffer (ioBuffer);

    Status = NtClose(TargetHandle);

    ASSERT(NT_SUCCESS(Status));

    return STATUS_SUCCESS;

} // ElfpCopyFile