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3.2.4.10 CprepDiskVerifyFileData (Opnum 18)

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The CprepDiskVerifyFileData method verifies that the data in the file matches the data passed to the method.

 HRESULT CprepDiskVerifyFileData(
   [in] CPREP_DISKID DiskId,
   [in] unsigned long ulPartition,
   [in, string] wchar_t* FileName,
   [in] unsigned long cbDataIn,
   [in, size_is(cbDataIn)] byte* DataIn
 );

DiskId:  The identifier of the ClusPrepDisk representing the disk that holds the file to verify.

ulPartition: The partition number of the partition associated with the volume on the disk that holds the file to verify from.

FileName:  The path and name of the file to verify from.

cbDataIn:  The size, in bytes, of the buffer DataIn.

DataIn:  The data to verify against the file.

Return Values:  A signed 32-bit value that indicates return status. If the method returns a negative value, it has failed. Zero or positive values indicate success, with the lower 16 bits in positive nonzero values containing warnings or flags defined in the method implementation. For more information about Win32 error codes and HRESULT values, see [MS-ERREF] sections 2.2 and 2.1.

Return value/code

Description

0x00000000

S_OK

The call was successful.

0x8007139F

ERROR_INVALID_STATE

The ClusPrepDisk.OnlineState is not equal to Online.

0x80070002

ERROR_FILE_NOT_FOUND

The disk was not found or ulPartition cannot be mapped to a volume.

The file does not exist.

0x800703ED

ERROR_UNRECOGNIZED_VOLUME

The volume does not contain a file system.

0x80070548

ERROR_INVALID_SERVER_STATE

The server's Prepare State is not Online.

For any other condition, this method MUST return a value that is not one of the values listed in the preceding table. The client MUST behave in one consistent, identical manner for all values that are not listed in the preceding table.

Exceptions Thrown: No exceptions are thrown beyond those thrown by the underlying RPC protocol [MS-RPCE].

The opnum field value for this method is 18.

When processing this call, the server MUST do the following as specified in section 3.2.4:

  • Obtain the ClusPrepDisk identified by the DiskId parameter.

  • Verify that the ClusPrepDisk.OnlineState is Online.

  • Map ulPartition to the corresponding volume.

  • Verify that the volume contains a file system.

  • If the file does not exist, return ERROR_FILE_NOT_FOUND.

  • Starting at offset 0, verify that the contents of the file match the number of cbDataIn bytes and the contents of DataIn. Verification is performed by a byte for byte comparison of the two sets of data.