2.2.4.20.1 Request

 SMB_Parameters
   {
   UCHAR  WordCount;
   Words
     {
     USHORT  FID;
     USHORT CountOfBytesToRead;
     ULONG  ReadOffsetInBytes;
     USHORT EstimateOfRemainingBytesToBeRead;
     }
   }
 SMB_Data
   {
   USHORT ByteCount;
   }
            

SMB_Parameters (11 bytes):

0	1	2	3	4	5	6	7	8	9	1 0	1	2	3	4	5	6	7	8	9	2 0	1	2	3	4	5	6	7	8	9	3 0	1
WordCount								Words
...
...

WordCount (1 byte): This field MUST be 0x05.

Words (10 bytes):

0	1	2	3	4	5	6	7	8	9	1 0	1	2	3	4	5	6	7	8	9	2 0	1	2	3	4	5	6	7	8	9	3 0	1
FID																CountOfBytesToRead
ReadOffsetInBytes
EstimateOfRemainingBytesToBeRead

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

CountOfBytesToRead (2 bytes): This field is a 16-bit unsigned integer indicating the number of bytes to be read from the file. The client MUST ensure that the amount of data requested will fit in the negotiated maximum buffer size.

ReadOffsetInBytes (4 bytes): This field is a 32-bit unsigned integer indicating the offset in number of bytes from which to begin reading from the file. The client MUST ensure that the amount of data requested fits in the negotiated maximum buffer size. Because this field is limited to 32 bits, this command is inappropriate for files that have 64-bit offsets.

EstimateOfRemainingBytesToBeRead (2 bytes): This field is a 16-bit unsigned integer indicating the remaining number of bytes that the client has designated to be read from the file. This is an advisory field and can be zero.

SMB_Data (2 bytes):

0	1	2	3	4	5	6	7	8	9	1 0	1	2	3	4	5	6	7	8	9	2 0	1	2	3	4	5	6	7	8	9	3 0	1
ByteCount

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