Changes from RFC Integer An XDR signed integer is a bit datum that encodes an integer in the range [,]. Introduction XDR is a standard for the description and encoding of data. Booleans are declared as follows:
Supporting two byte-orderings requires a higher-level protocol for determining in which byte-order the data is encoded. Please refer to the current edition of the "Internet Official Protocol Standards" STD 1 for the standardization state and status of this protocol. The fractional part of the number's mantissa, base 2. Security Considerations XDR is a data description language, not a protocol, and hence it does not inherently give rise to any particular security considerations. The array is encoded as the element count n an unsigned integer followed by the encoding of each of the array's elements, starting with element 0 and progressing through element n This makes the implementation of XDR encoding and decoding modules an easier task. XDR Data Types Each of the sections that follow describes a data type defined in the XDR standard, shows how it is declared in the language, and includes a graphic illustration of its encoding. Enumeration Enumerations have the same representation as signed integers. For example, here are the two ways to define the type "bool": That is, "int", "unsigned int", "bool", an enumerated type, or any typedefed type that evaluates to one of these is legal. The XDR standard makes the following assumption: String The standard defines a string of n numbered 0 through n-1 ASCII bytes to be the number n encoded as an unsigned integer as described above , and followed by the n bytes of the string. The "NaN" encoding as it applies to quadruple-precision floating- point numbers is system dependent and should not be interpreted within XDR as anything other than "NaN". A few of them are: A given hardware device should encode the bytes onto the various media in such a way that other hardware devices may decode the bytes without loss of meaning. Hyper Integer and Unsigned Hyper Integer The standard also defines bit 8-byte numbers called hyper integers and unsigned hyper integers. The definitions for quadruple-precision floating point numbers are analogs of those for single and double-precision floating point numbers and are defined in [ IEEE ]. The size of the implied arm is always a multiple of four bytes. Changes from RFC This document makes no technical changes to RFC and is published for the purposes of noting IANA considerations, augmenting security considerations, and distinguishing normative from informative references. Also, the case values must be one of the legal values of the discriminant. Variable-Length Array Counted arrays provide the ability to encode variable-length arrays of homogeneous elements. Their representations are the obvious extensions of integer and unsigned integer defined above. The constant m would normally be found in a protocol specification. Google Network Working Group M. In fact, the syntax is the same as that of the C language for pointers. Optional-Data Optional-data is one kind of union that occurs so frequently that we give it a special syntax of its own for declaring it. This data is called "opaque" and is declared as follows:
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