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<title>4.7.1.1 Codec Objects </title>
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<H3>
<BR>
4.7.1.1 Codec Objects 
</H3>

<P>
The <tt class="class">Codec</tt> class defines these methods which also define the
function interfaces of the stateless encoder and decoder:

<P>
<dl><dt><b><a name='l2h-661'><tt class='method'>encode</tt></a></b> (<var>input</var><big>[</big><var>, errors</var><big>]</big>)
<dd>
  Encodes the object <var>input</var> and returns a tuple (output object,
  length consumed).

<P>
<var>errors</var> defines the error handling to apply. It defaults to
  <code>'strict'</code> handling.

<P>
The method may not store state in the <tt class="class">Codec</tt> instance. Use
  <tt class="class">StreamCodec</tt> for codecs which have to keep state in order to
  make encoding/decoding efficient.

<P>
The encoder must be able to handle zero length input and return an
  empty object of the output object type in this situation.
</dl>

<P>
<dl><dt><b><a name='l2h-662'><tt class='method'>decode</tt></a></b> (<var>input</var><big>[</big><var>, errors</var><big>]</big>)
<dd>
  Decodes the object <var>input</var> and returns a tuple (output object,
  length consumed).

<P>
<var>input</var> must be an object which provides the <code>bf_getreadbuf</code>
  buffer slot.  Python strings, buffer objects and memory mapped files
  are examples of objects providing this slot.

<P>
<var>errors</var> defines the error handling to apply. It defaults to
  <code>'strict'</code> handling.

<P>
The method may not store state in the <tt class="class">Codec</tt> instance. Use
  <tt class="class">StreamCodec</tt> for codecs which have to keep state in order to
  make encoding/decoding efficient.

<P>
The decoder must be able to handle zero length input and return an
  empty object of the output object type in this situation.
</dl>

<P>
The <tt class="class">StreamWriter</tt> and <tt class="class">StreamReader</tt> classes provide
generic working interfaces which can be used to implement new
encodings submodules very easily. See <tt class="module">encodings.utf_8</tt> for an
example on how this is done.

<P>

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