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Safari | Python Developer's Handbook -> XDR Data Exchange Format





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XDR Data Exchange Format

XDR is best described as a standard for data description and encoding. It uses a implicit typing language to describe intricate data formats in a concise mannernote that this language is not a programming language. Protocols such as Sun RPC (Remote Procedure Call) and the NFS (Network File System, which was initially built on top of RPC) use XDR to describe the format of their data because XDR is useful for transferring data between different computer architectures. XDR has been used to communicate with data between such diverse machines as the SUN WORKSTATION, VAX, IBM-PC, and Cray. It is a very portable implementation. For more information, check out

Internet standardsRFC 1014, External Data Representation

http://info.internet.isi.edu/in-notes/rfc/files/rfc1014.txt

xdrlib

The xdrlib module almost entirely supports the External Data Representation Standard (XDR) as described in RFC 1014, written by Sun Microsystems, Inc. on June 1987. Therefore, it is used extensively in networked applications, mainly the ones that need to handle RPC.

This module defines two exceptions, and two classesone for packing variables into XDR representation, and another for unpacking from XDR representation:

Packer() Packer is the class for packing data into XDR representation. The Packer class is instantiated with no arguments.

Unpacker(data) Unpacker is the complementary class, which unpacks XDR data values from a string buffer. The input buffer is given as data.

Packer Objects

Packer instances have the following methods:

get_buffer() Returns the current pack buffer as a string.

reset() Resets the pack buffer to the empty string.

In general, you can pack any of the most common XDR data types by calling the appropriate pack_type() method. Each method takes a single argument, the value to pack. The following simple data type packing methods are supported: pack_uint(),pack_int(),pack_enum(),pack_bool(),pack_uhyper(), and pack_hyper(). The following methods support floating point number packing.

pack_float(value) Packs the single-precision floating point number value.

pack_double(value) Packs the double-precision floating point number value.

The following methods support packing strings, bytes, and opaque data:

pack_fstring(n, s) Packs a fixed length string, s.n is the length of the string, but it is not packed into the data buffer. The string is padded with null bytes if necessary to guarantee 4 byte alignment.

pack_fopaque(n, data) Packs a fixed length opaque data stream, similar to pack_fstring().

pack_string(s) Packs a variable length string, s. The length of the string is first packed as an unsigned integer, and then the string data is packed with pack_fstring().

pack_opaque(data) Packs a variable length opaque data string, similar to pack_string().

pack_bytes(bytes) Packs a variable length byte stream, similar to pack_string().

The following methods support packing arrays and lists:

pack_list(list, pack_item) Packs a list of homogeneous items. This method is useful for lists with an indeterminate size; that is, the size is not available until the entire list has been walked. For each item in the list, an unsigned integer 1 is packed first, followed by the data value from the list. pack_item is the function called to pack the individual item. At the end of the list, an unsigned integer 0 is packed. ... ... (Not finished, please download and read the complete file)

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Warm tip!

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