ll this let this device skip the gzip headers when reading/writing.
This way KCompressionDevice (with gzip filter) can be used as a direct wrapper
around zlib - this is used by KZip.
</p></div></div><a class="anchor" name="writeData"></a>
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<td class="memname">long writeData</td>
<td>(</td>
<td class="paramtype">&nbsp;<em>self</em>, </td>
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<td class="paramtype">QStr