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<title>c14n: Provide Canonical XML and Exclusive XML Canonicalization</title>
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<h2><span class="refentrytitle">c14n</span></h2>
<p>c14n - Provide Canonical XML and Exclusive XML Canonicalization</p>
<p>the c14n modules provides a  "Canonical XML" implementation</p>
<p>Author(s): Aleksey Sanin &lt;aleksey@aleksey.com&gt; </p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<pre class="synopsis">typedef enum <a href="#xmlC14NMode">xmlC14NMode</a>;
int	<a href="#xmlC14NDocDumpMemory">xmlC14NDocDumpMemory</a>		(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br>					 <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br>					 int mode, <br>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br>					 int with_comments, <br>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** doc_txt_ptr);
int	<a href="#xmlC14NDocSave">xmlC14NDocSave</a>			(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br>					 <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br>					 int mode, <br>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br>					 int with_comments, <br>					 const char * filename, <br>					 int compression);
int	<a href="#xmlC14NDocSaveTo">xmlC14NDocSaveTo</a>		(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br>					 <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br>					 int mode, <br>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br>					 int with_comments, <br>					 <a href="libxml2-tree.html#xmlOutputBufferPtr">xmlOutputBufferPtr</a> buf);
int	<a href="#xmlC14NExecute">xmlC14NExecute</a>			(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br>					 <a href="libxml2-c14n.html#xmlC14NIsVisibleCallback">xmlC14NIsVisibleCallback</a> is_visible_callback, <br>					 void * user_data, <br>					 int mode, <br>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br>					 int with_comments, <br>					 <a href="libxml2-tree.html#xmlOutputBufferPtr">xmlOutputBufferPtr</a> buf);
typedef int <a href="#xmlC14NIsVisibleCallback">xmlC14NIsVisibleCallback</a>	(void * user_data, <br>					 <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node, <br>					 <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> parent);
</pre>
</div>
<div class="refsect1" lang="en"><h2>Description</h2></div>
<div class="refsect1" lang="en">
<h2>Details</h2>
<div class="refsect2" lang="en">
<div class="refsect2" lang="en">
<h3>
<a name="xmlC14NMode">Enum </a>xmlC14NMode</h3>
<pre class="programlisting">enum <a href="#xmlC14NMode">xmlC14NMode</a> {
    <a name="XML_C14N_1_0">XML_C14N_1_0</a> = 0 /* Original C14N 1.0 spec */
    <a name="XML_C14N_EXCLUSIVE_1_0">XML_C14N_EXCLUSIVE_1_0</a> = 1 /* Exclusive C14N 1.0 spec */
    <a name="XML_C14N_1_1">XML_C14N_1_1</a> = 2 /*  C14N 1.1 spec */
};
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlC14NIsVisibleCallback"></a>Function type xmlC14NIsVisibleCallback</h3>
<pre class="programlisting">int	xmlC14NIsVisibleCallback	(void * user_data, <br>					 <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node, <br>					 <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> parent)<br>
</pre>
<p>Signature for a C14N callback on visible nodes</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>user_data</tt></i>:</span></td>
<td>user data</td>
</tr>
<tr>
<td><span class="term"><i><tt>node</tt></i>:</span></td>
<td>the current node</td>
</tr>
<tr>
<td><span class="term"><i><tt>parent</tt></i>:</span></td>
<td>the parent node</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>1 if the node should be included</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlC14NDocDumpMemory"></a>xmlC14NDocDumpMemory ()</h3>
<pre class="programlisting">int	xmlC14NDocDumpMemory		(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br>					 <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br>					 int mode, <br>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br>					 int with_comments, <br>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** doc_txt_ptr)<br>
</pre>
<p>Dumps the canonized image of given XML document into memory. For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>doc</tt></i>:</span></td>
<td>the XML document for canonization</td>
</tr>
<tr>
<td><span class="term"><i><tt>nodes</tt></i>:</span></td>
<td>the nodes set to be included in the canonized image or NULL if all document nodes should be included</td>
</tr>
<tr>
<td><span class="term"><i><tt>mode</tt></i>:</span></td>
<td>the c14n mode (see @xmlC14NMode)</td>
</tr>
<tr>
<td><span class="term"><i><tt>inclusive_ns_prefixes</tt></i>:</span></td>
<td>the list of inclusive namespace prefixes ended with a NULL or NULL if there is no inclusive namespaces (only for exclusive canonicalization, ignored otherwise)</td>
</tr>
<tr>
<td><span class="term"><i><tt>with_comments</tt></i>:</span></td>
<td>include comments in the result (!=0) or not (==0)</td>
</tr>
<tr>
<td><span class="term"><i><tt>doc_txt_ptr</tt></i>:</span></td>
<td>the memory pointer for allocated canonical XML text; the caller of this functions is responsible for calling xmlFree() to free allocated memory</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the number of bytes written on success or a negative value on fail</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlC14NDocSave"></a>xmlC14NDocSave ()</h3>
<pre class="programlisting">int	xmlC14NDocSave			(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br>					 <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br>					 int mode, <br>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br>					 int with_comments, <br>					 const char * filename, <br>					 int compression)<br>
</pre>
<p>Dumps the canonized image of given XML document into the file. For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>doc</tt></i>:</span></td>
<td>the XML document for canonization</td>
</tr>
<tr>
<td><span class="term"><i><tt>nodes</tt></i>:</span></td>
<td>the nodes set to be included in the canonized image or NULL if all document nodes should be included</td>
</tr>
<tr>
<td><span class="term"><i><tt>mode</tt></i>:</span></td>
<td>the c14n mode (see @xmlC14NMode)</td>
</tr>
<tr>
<td><span class="term"><i><tt>inclusive_ns_prefixes</tt></i>:</span></td>
<td>the list of inclusive namespace prefixes ended with a NULL or NULL if there is no inclusive namespaces (only for exclusive canonicalization, ignored otherwise)</td>
</tr>
<tr>
<td><span class="term"><i><tt>with_comments</tt></i>:</span></td>
<td>include comments in the result (!=0) or not (==0)</td>
</tr>
<tr>
<td><span class="term"><i><tt>filename</tt></i>:</span></td>
<td>the filename to store canonical XML image</td>
</tr>
<tr>
<td><span class="term"><i><tt>compression</tt></i>:</span></td>
<td>the compression level (zlib required): -1 - libxml default, 0 - uncompressed, &gt;0 - compression level</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the number of bytes written success or a negative value on fail</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlC14NDocSaveTo"></a>xmlC14NDocSaveTo ()</h3>
<pre class="programlisting">int	xmlC14NDocSaveTo		(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br>					 <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br>					 int mode, <br>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br>					 int with_comments, <br>					 <a href="libxml2-tree.html#xmlOutputBufferPtr">xmlOutputBufferPtr</a> buf)<br>
</pre>
<p>Dumps the canonized image of given XML document into the provided buffer. For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>doc</tt></i>:</span></td>
<td>the XML document for canonization</td>
</tr>
<tr>
<td><span class="term"><i><tt>nodes</tt></i>:</span></td>
<td>the nodes set to be included in the canonized image or NULL if all document nodes should be included</td>
</tr>
<tr>
<td><span class="term"><i><tt>mode</tt></i>:</span></td>
<td>the c14n mode (see @xmlC14NMode)</td>
</tr>
<tr>
<td><span class="term"><i><tt>inclusive_ns_prefixes</tt></i>:</span></td>
<td>the list of inclusive namespace prefixes ended with a NULL or NULL if there is no inclusive namespaces (only for exclusive canonicalization, ignored otherwise)</td>
</tr>
<tr>
<td><span class="term"><i><tt>with_comments</tt></i>:</span></td>
<td>include comments in the result (!=0) or not (==0)</td>
</tr>
<tr>
<td><span class="term"><i><tt>buf</tt></i>:</span></td>
<td>the output buffer to store canonical XML; this buffer MUST have encoder==NULL because C14N requires UTF-8 output</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>non-negative value on success or a negative value on fail</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlC14NExecute"></a>xmlC14NExecute ()</h3>
<pre class="programlisting">int	xmlC14NExecute			(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br>					 <a href="libxml2-c14n.html#xmlC14NIsVisibleCallback">xmlC14NIsVisibleCallback</a> is_visible_callback, <br>					 void * user_data, <br>					 int mode, <br>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br>					 int with_comments, <br>					 <a href="libxml2-tree.html#xmlOutputBufferPtr">xmlOutputBufferPtr</a> buf)<br>
</pre>
<p>Dumps the canonized image of given XML document into the provided buffer. For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>doc</tt></i>:</span></td>
<td>the XML document for canonization</td>
</tr>
<tr>
<td><span class="term"><i><tt>is_visible_callback</tt></i>:</span></td>
<td>the function to use to determine is node visible or not</td>
</tr>
<tr>
<td><span class="term"><i><tt>user_data</tt></i>:</span></td>
<td>the first parameter for @is_visible_callback function (in most cases, it is nodes set)</td>
</tr>
<tr>
<td><span class="term"><i><tt>mode</tt></i>:</span></td>
<td>the c14n mode (see @xmlC14NMode)</td>
</tr>
<tr>
<td><span class="term"><i><tt>inclusive_ns_prefixes</tt></i>:</span></td>
<td>the list of inclusive namespace prefixes ended with a NULL or NULL if there is no inclusive namespaces (only for exclusive canonicalization, ignored otherwise)</td>
</tr>
<tr>
<td><span class="term"><i><tt>with_comments</tt></i>:</span></td>
<td>include comments in the result (!=0) or not (==0)</td>
</tr>
<tr>
<td><span class="term"><i><tt>buf</tt></i>:</span></td>
<td>the output buffer to store canonical XML; this buffer MUST have encoder==NULL because C14N requires UTF-8 output</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>non-negative value on success or a negative value on fail</td>
</tr>
</tbody>
</table></div>
</div>
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