typedef unsigned char  BYTE;
typedef unsigned short WORD;
typedef unsigned long  DWORD;

typedef struct {
  BYTE       netbios_command;
  BYTE       netbios_flags;
  WORD       netbios_size;
/*BYTE       Protocol[4];     Protocol identifier 0xFF,"SMB" */
  DWORD      Protocol;     /* For faster compare */
  BYTE       Command;      /* Command Code, look below */
  union {
    struct {
      BYTE   ErrorClass;
      BYTE   Reserved;
      WORD   Error;
    }      DosError;
    DWORD    Status;
  }        Status;
  BYTE       Flags;
  WORD       Flags2;
  union {
    WORD     Pad[6];       /* Ensure 12 bytes len */
    struct {
      WORD   PidHigh;
      BYTE   SecuritySignature[8];
    }      Extra;
  };
  WORD       TreeID;
  WORD       ProcessID;
  WORD       UserID;
  WORD       MultiplexID;
  BYTE       WordCount;
  WORD       ParameterWords[0];
} SMB_HEADER;

typedef struct {
  WORD       ByteCount;
  BYTE       Buffer[0];
} SMB_HEADER2;

/* This is the protocol identifier, each smb
   request must begin with this double word
*/
#define SMB_HEADER_PROTOCOL_MAGIC 0xff534d42

/* These are all valid SMB requests known from the document
   http://www.snia.org/tech_activities/CIFS/CIFS_TR-1p00_FINAL.pdf

   However, we only intend to implement the core smb command set,
   also known as dialect "PC NETWORK PROGRAM 1.0" and still only
   a read-only subset of this.
*/

enum {
  SMB_COM_CREATE_DIRECTORY                 = 0x00,
  SMB_COM_DELETE_DIRECTORY                 = 0x01,
  SMB_COM_OPEN                             = 0x02,
  SMB_COM_CREATE                           = 0x03,
  SMB_COM_CLOSE                            = 0x04,
  SMB_COM_FLUSH                            = 0x05,
  SMB_COM_DELETE                           = 0x06,
  SMB_COM_RENAME                           = 0x07,
  SMB_COM_QUERY_INFORMATION                = 0x08,
  SMB_COM_SET_INFORMATION                  = 0x09,
  SMB_COM_READ                             = 0x0A,
  SMB_COM_WRITE                            = 0x0B,
  SMB_COM_LOCK_BYTE_RANGE                  = 0x0C,
  SMB_COM_UNLOCK_BYTE_RANGE                = 0x0D,
  SMB_COM_CREATE_TEMPORARY                 = 0x0E,
  SMB_COM_CREATE_NEW                       = 0x0F,
  
  SMB_COM_CHECK_DIRECTORY                  = 0x10,
  SMB_COM_PROCESS_EXIT                     = 0x11,
  SMB_COM_SEEK                             = 0x12,
  SMB_COM_LOCK_AND_READ                    = 0x13,
  SMB_COM_WRITE_AND_UNLOCK                 = 0x14,
  /* ... */
  SMB_COM_READ_RAW                         = 0x1A,
  SMB_COM_READ_MPX                         = 0x1B,
  SMB_COM_READ_MPX_SECONDARY               = 0x1C,
  SMB_COM_WRITE_RAW                        = 0x1D,
  SMB_COM_WRITE_MPX                        = 0x1E,
  SMB_COM_WRITE_MPX_SECONDARY              = 0x1F,

  SMB_COM_WRITE_COMPLETE                   = 0x20,
  SMB_COM_QUERY_SERVER                     = 0x21,
  SMB_COM_SET_INFORMATION2                 = 0x22,
  SMB_COM_QUERY_INFORMATION2               = 0x23,
  SMB_COM_LOCKING_ANDX                     = 0x24,
  SMB_COM_TRANSACTION                      = 0x25,
  SMB_COM_TRANSACTION_SECONDARY            = 0x26,
  SMB_COM_IOCTL                            = 0x27,
  SMB_COM_IOCTL_SECONDARY                  = 0x28,
  SMB_COM_COPY                             = 0x29,
  SMB_COM_MOVE                             = 0x2A,
  SMB_COM_ECHO                             = 0x2B,
  SMB_COM_WRITE_AND_CLOSE                  = 0x2C,
  SMB_COM_OPEN_ANDX                        = 0x2D,
  SMB_COM_READ_ANDX                        = 0x2E,
  SMB_COM_WRITE_ANDX                       = 0x2F,

  SMB_COM_NEW_FILE_SIZE                    = 0x30,
  SMB_COM_CLOSE_AND_TREE_DISC              = 0x31,
  SMB_COM_TRANSACTION2                     = 0x32,
  SMB_COM_TRANSACTION2_SECONDARY           = 0x33,
  SMB_COM_FIND_CLOSE2                      = 0x34,
  SMB_COM_FIND_NOTIFY_CLOSE                = 0x35,
  /* ... */

  SMB_COM_TREE_CONNECT                     = 0x70,
  SMB_COM_TREE_DISCONNECT                  = 0x71,
  SMB_COM_NEGOTIATE                        = 0x72,
  SMB_COM_SESSION_SETUP_ANDX               = 0x73,
  SMB_COM_LOGOFF_ANDX                      = 0x74,
  SMB_COM_TREE_CONNECT_ANDX                = 0x75,
  /* ... */

  SMB_COM_QUERY_INFORMATION_DISK           = 0x80,
  SMB_COM_SEARCH                           = 0x81,
  SMB_COM_FIND                             = 0x82,
  SMB_COM_FIND_UNIQUE                      = 0x83,
  SMB_COM_FIND_CLOSE                       = 0x84,
  /* ... */

  SMB_COM_NT_TRANSACT                      = 0xA0,
  SMB_COM_NT_TRANSACT_SECONDARY            = 0xA1,
  SMB_COM_NT_CREATE_ANDX                   = 0xA2,
  /* ... */
  SMB_COM_NT_CANCEL                        = 0xA4,
  SMB_COM_NT_RENAME                        = 0xA5,
  /* ... */

  SMB_COM_OPEN_PRINT_FILE                  = 0xC0,
  SMB_COM_WRITE_PRINT_FILE                 = 0xC1,
  SMB_COM_CLOSE_PRINT_FILE                 = 0xC2,
  SMB_COM_GET_PRINT_QUEUE                  = 0xC3,
  /* ... */

  SMB_COM_READ_BULK                        = 0xD8,
  SMB_COM_WRITE_BULK                       = 0xD9,
  SMB_COM_WRITE_BULK_DATA                  = 0xDA
} SMB_COMMAND;