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build/node_modules/pngjs/lib/packer-sync.js

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+'use strict';
+
+var hasSyncZlib = true;
+var zlib = require('zlib');
+var constants = require('./constants');
+var Packer = require('./packer');
+
+module.exports = function(metaData, opt) {
+
+  if (!hasSyncZlib) {
+    throw new Error('To use the sync capability of this library in old node versions, please pin pngjs to v2.3.0');
+  }
+
+  var options = opt || {};
+
+  var packer = new Packer(options);
+
+  var chunks = [];
+
+  // Signature
+  chunks.push(new Buffer(constants.PNG_SIGNATURE));
+
+  // Header
+  chunks.push(packer.packIHDR(metaData.width, metaData.height));
+
+  if (metaData.gamma) {
+    chunks.push(packer.packGAMA(metaData.gamma));
+  }
+
+  var filteredData = packer.filterData(metaData.data, metaData.width, metaData.height);
+
+  // compress it
+  var compressedData = zlib.deflateSync(filteredData, packer.getDeflateOptions());
+  filteredData = null;
+
+  if (!compressedData || !compressedData.length) {
+    throw new Error('bad png - invalid compressed data response');
+  }
+  chunks.push(packer.packIDAT(compressedData));
+
+  // End
+  chunks.push(packer.packIEND());
+
+  return Buffer.concat(chunks);
+};