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<title>eXternal Data Representation (XDR) APIs</title>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">eXternal Data Representation (XDR) APIs</h1>
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<div><p>These APIs allow RPC applications to handle arbitrary
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data structures, regardless of their different hosts' byte orders or structure
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layout conventions.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><thead align="left"><tr><th align="left" valign="bottom" width="33.33333333333333%" id="d0e21">API</th>
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<th align="left" valign="bottom" width="66.66666666666666%" id="d0e23">Description</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_array()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between variable-length arrays and their corresponding external representations.
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This function is called to encode or decode each element of the array</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_bool() </span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between Booleans (C integers) and their external representations. When encoding
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data, this filter produces values of either 1 or 0. </td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_bytes()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between counted byte arrays and their external representations. This function
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treats a subset of generic arrays in which the size of array elements is known
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to be 1 and the external description of each element is built-in. The length
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of the byte sequence is explicitly located in an unsigned integer. The byte
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sequence is not ended by a null character. The external representation of
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the bytes is the same as their internal representation.</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_char()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between C-language characters and their external representation</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_double()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between C-language double-precision numbers and their external representations</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_double_char()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between C-language 2-byte characters and their external representation</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_enum()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between C-language enumeration (enum) and its external representation</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_free()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">Recursively frees the object pointed
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to by the pointer passed in</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_float()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between C-language floating-point numbers (normalized single floating-point
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numbers) and their external representations</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_int()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between C-language integers and their external representation</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_long()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between C-language long integers and their external representations</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_netobj()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between variable-length opaque data and its external representation</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_opaque()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between fixed-size opaque data and its external representation</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_pointer()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">Provides pointer chasing within
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structures and serializes null pointers. Can represent recursive data structures,
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such as binary trees or linked lists.</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_reference()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">a filter primitive that provides
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pointer chasing within structures. This primitive allows the serializing,
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deserializing, and freeing of any pointers within one structure that are referenced
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by another structure. The <span class="apiname">xdr_reference()</span> function does
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not attach special meaning to a null pointer during serialization, and passing
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the address of a null pointer may cause a memory error. Therefore, the programmer
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must describe data with a two-sided discriminated union. One side is used
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when the pointer is valid; the other side, when the pointer is null. </td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_short()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between C-language short integers and their external representation</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_string()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between C-language strings and their corresponding external representations</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_u_char()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between unsigned C-language characters and their external representations</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_u_int()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between C-language unsigned integers and their external representations</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_u_long()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between C-language unsigned long integers and their external representations</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_u_short()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between C-language unsigned short integers and their external representations</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_union()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between discriminated C unions and their corresponding external representations</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_vector()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A filter primitive that translates
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between fixed-length arrays and their corresponding external representations</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_void()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">Has no parameters. It is passed
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to other RPC functions that require a parameter, but does not transmit data</td>
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</tr>
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<tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e21 "><span class="apiname">xdr_wrapstring()</span></td>
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<td align="left" valign="top" width="66.66666666666666%" headers="d0e23 ">A primitive that calls the <span class="apiname">xdr_string(xdr,
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sp, maxuint)</span> API, where maxuint is the maximum value of an unsigned
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integer. The <span class="apiname">xdr_wrapstring()</span> is useful because the RPC
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package passes a maximum of two XDR functions as parameters, and the <span class="apiname">xdr_string()</span> function
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requires three. </td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaaxtirpc.htm" title="Developed by Sun Microsystems, remote procedure call (RPC) easily separates and distributes client applications from a server mechanism.">Transport-independent remote procedure call</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../apifinder/finder.htm">API finder</a></div>
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</div>
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</div>
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