2.2.4.23.1 Request

 SMB_Parameters
   {
   UCHAR  WordCount;
   Words
     {
     USHORT FID;
     ULONG  Offset;
     USHORT MaxCountOfBytesToReturn;
     USHORT MinCountOfBytesToReturn;
     ULONG  Timeout;
     USHORT Reserved;
     }
   }
 SMB_Data
   {
   USHORT ByteCount;
   }
            

SMB_Header:

CID (2 bytes): This field MUST contain the Connection ID (CID) of the connectionless transport session.

MID (2 bytes): This field MUST contain a valid MID that MUST be unique to this request within the client's session.

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SMB_Parameters (17 bytes)
...
...
...								SMB_Data

SMB_Parameters (17 bytes):

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WordCount								Words (16 bytes)
...
...
...

WordCount (1 byte): This field MUST be 0x08. The length, in two-byte words, of the remaining SMB_Parameters.

Words (16 bytes):

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FID																Offset
...																MaxCountOfBytesToReturn
MinCountOfBytesToReturn																Timeout
...																Reserved

FID (2 bytes): This field MUST be a valid 16-bit unsigned integer indicating the file from which the data MUST be read.

Offset (4 bytes): The offset, in bytes, from the start of the file at which the read begins.

MaxCountOfBytesToReturn (2 bytes): The requested maximum number of bytes to read from the file and return to the client. The value MAY exceed the negotiated buffer size.

MinCountOfBytesToReturn (2 bytes): The requested minimum number of bytes to read from the file and return to the client. This field is used only when reading from a named pipe or a device. It MUST be ignored when reading from a standard file.

Timeout (4 bytes): The number of milliseconds that the server is requested to wait while processing this command. This field is optionally honored only when reading from a named pipe or I/O device. It does not apply when reading from a regular file.

Reserved (2 bytes): This field SHOULD be set to 0x0000.

SMB_Data (2 bytes):

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ByteCount

ByteCount (2 bytes): This field MUST be 0x0000. No data is sent by this message.