archived-doc-en/reference/zlib/functions/inflate_init.xml

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<refentry xml:id="function.inflate-init" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>inflate_init</refname>
  <refpurpose>Initialize an incremental inflate context</refpurpose>
 </refnamediv>

 <refsect1 role="description"><!-- {{{ -->
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>InflateContext</type><type>false</type></type><methodname>inflate_init</methodname>
   <methodparam><type>int</type><parameter>encoding</parameter></methodparam>
   <methodparam choice="opt"><type class="union"><type>array</type><type>object</type></type><parameter>options</parameter><initializer>[]</initializer></methodparam>
  </methodsynopsis>
  <para>
    Initialize an incremental inflate context with the specified
    <parameter>encoding</parameter>.
  </para>
 </refsect1><!-- }}} -->

 <refsect1 role="parameters"><!-- {{{ -->
  &reftitle.parameters;
  <variablelist>
   <varlistentry>
    <term><parameter>encoding</parameter></term>
    <listitem>
     <para>
      One of the <constant>ZLIB_ENCODING_<replaceable>*</replaceable></constant> constants.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>options</parameter></term>
    <listitem>
     <para>
      An associative array which may contain the following elements:
      <variablelist>
       <varlistentry>
        <term><varname>level</varname></term>
        <listitem>
         <para>
          The compression level in range -1..9; defaults to -1.
         </para>
        </listitem>
       </varlistentry>
       <varlistentry>
        <term><varname>memory</varname></term>
        <listitem>
         <para>
          The compression memory level in range 1..9; defaults to 8.
         </para>
        </listitem>
       </varlistentry>
       <varlistentry>
        <term><varname>window</varname></term>
        <listitem>
         <para>
          The zlib window size (logarithmic) in range 8..15; defaults to 15.
         </para>
        </listitem>
       </varlistentry>
       <varlistentry>
        <term><varname>strategy</varname></term>
        <listitem>
         <para>
          One of <constant>ZLIB_FILTERED</constant>,
          <constant>ZLIB_HUFFMAN_ONLY</constant>, <constant>ZLIB_RLE</constant>,
          <constant>ZLIB_FIXED</constant> or
          <constant>ZLIB_DEFAULT_STRATEGY</constant> (the default).
         </para>
        </listitem>
       </varlistentry>
       <varlistentry>
        <term><varname>dictionary</varname></term>
        <listitem>
         <para>
          A <type>string</type> or an <type>array</type> of <type>strings</type>
          of the preset dictionary (default: no preset dictionary).
         </para>
        </listitem>
       </varlistentry>
      </variablelist>
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1><!-- }}} -->

 <refsect1 role="returnvalues"><!-- {{{ -->
  &reftitle.returnvalues;
  <para>
   Returns an inflate context resource (<literal>zlib.inflate</literal>) on
   success, &return.falseforfailure;.
  </para>
 </refsect1><!-- }}} -->

 <refsect1 role="errors"><!-- {{{ -->
  &reftitle.errors;
  <para>
   If an invalid encoding or option is passed to <parameter>options</parameter>,
   or the context couldn't be created, an error of level
   <constant>E_WARNING</constant> is generated.
  </para>
 </refsect1><!-- }}} -->

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.0.0</entry>
      <entry>
       On success, this function returns an <classname>InflateContext</classname> instance now;
       previously, a <type>resource</type> was returned.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <caution>
   <simpara>
    Unlike <function>gzinflate</function>, incremental inflate contexts do not
    constrain the length of the decoded data, so provide no automatic protection
    against Zip bombs.
   </simpara>
  </caution>
 </refsect1>

 <refsect1 role="seealso"><!-- {{{ -->
  &reftitle.seealso;
  <simplelist>
   <member><function>inflate_add</function></member>
   <member><function>deflate_init</function></member>
  </simplelist>
 </refsect1><!-- }}} -->

</refentry>
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