Machine encodings

This section describes the structure of the Encoding field in the message descriptor.

See MQMD - Message descriptor for a summary of the fields in the structure.

The Encoding field is a 32-bit integer that is divided into four separate subfields; these subfields identify:

  • The encoding used for binary integers
  • The encoding used for packed-decimal integers
  • The encoding used for floating-point numbers
  • Reserved bits
Each subfield is identified by a bit mask that has 1-bits in the positions corresponding to the subfield, and 0-bits elsewhere. The bits are numbered such that bit 0 is the most significant bit, and bit 31 the least significant bit. The following masks are defined:

    MQENC_INTEGER_MASK
    Mask for binary-integer encoding.

    This subfield occupies bit positions 28 through 31 within the Encoding field.

    MQENC_DECIMAL_MASK
    Mask for packed-decimal-integer encoding.

    This subfield occupies bit positions 24 through 27 within the Encoding field.

    MQENC_FLOAT_MASK
    Mask for floating-point encoding.

    This subfield occupies bit positions 20 through 23 within the Encoding field.

    MQENC_RESERVED_MASK
    Mask for reserved bits.

    This subfield occupies bit positions 0 through 19 within the Encoding field.