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        <h1><a href="index.html">All files</a> packer-sync.js</h1>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">"use strict";
&nbsp;
let hasSyncZlib = true;
let zlib = require("zlib");
<span class="missing-if-branch" title="if path not taken" >I</span>if (!zlib.deflateSync) {
<span class="cstat-no" title="statement not covered" >  hasSyncZlib = false;</span>
}
let constants = require("./constants");
let Packer = require("./packer");
&nbsp;
module.exports = <span class="fstat-no" title="function not covered" >fu</span>nction (metaData, opt) {
<span class="cstat-no" title="statement not covered" >  if (!hasSyncZlib) {</span>
<span class="cstat-no" title="statement not covered" >    throw new Error(</span>
      "To use the sync capability of this library in old node versions, please pin pngjs to v2.3.0"
    );
  }
&nbsp;
  let options = <span class="cstat-no" title="statement not covered" >opt || {};</span>
&nbsp;
  let packer = <span class="cstat-no" title="statement not covered" >new Packer(options);</span>
&nbsp;
  let chunks = <span class="cstat-no" title="statement not covered" >[];</span>
&nbsp;
  // Signature
<span class="cstat-no" title="statement not covered" >  chunks.push(Buffer.from(constants.PNG_SIGNATURE));</span>
&nbsp;
  // Header
<span class="cstat-no" title="statement not covered" >  chunks.push(packer.packIHDR(metaData.width, metaData.height));</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  if (metaData.gamma) {</span>
<span class="cstat-no" title="statement not covered" >    chunks.push(packer.packGAMA(metaData.gamma));</span>
  }
&nbsp;
  let filteredData = <span class="cstat-no" title="statement not covered" >packer.filterData(</span>
    metaData.data,
    metaData.width,
    metaData.height
  );
&nbsp;
  // compress it
  let compressedData = <span class="cstat-no" title="statement not covered" >zlib.deflateSync(</span>
    filteredData,
    packer.getDeflateOptions()
  );
<span class="cstat-no" title="statement not covered" >  filteredData = null;</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  if (!compressedData || !compressedData.length) {</span>
<span class="cstat-no" title="statement not covered" >    throw new Error("bad png - invalid compressed data response");</span>
  }
<span class="cstat-no" title="statement not covered" >  chunks.push(packer.packIDAT(compressedData));</span>
&nbsp;
  // End
<span class="cstat-no" title="statement not covered" >  chunks.push(packer.packIEND());</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  return Buffer.concat(chunks);</span>
};
&nbsp;</pre></td></tr></table></pre>

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