first commit

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

@@ -0,0 +1,96 @@
+'use strict';
+
+var hasSyncZlib = true;
+var zlib = require('zlib');
+var inflateSync = require('./sync-inflate');
+var SyncReader = require('./sync-reader');
+var FilterSync = require('./filter-parse-sync');
+var Parser = require('./parser');
+var bitmapper = require('./bitmapper');
+var formatNormaliser = require('./format-normaliser');
+
+
+module.exports = function(buffer, options) {
+
+  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 err;
+  function handleError(_err_) {
+    err = _err_;
+  }
+
+  var metaData;
+  function handleMetaData(_metaData_) {
+    metaData = _metaData_;
+  }
+
+  function handleTransColor(transColor) {
+    metaData.transColor = transColor;
+  }
+
+  function handlePalette(palette) {
+    metaData.palette = palette;
+  }
+
+  var gamma;
+  function handleGamma(_gamma_) {
+    gamma = _gamma_;
+  }
+
+  var inflateDataList = [];
+  function handleInflateData(inflatedData) {
+    inflateDataList.push(inflatedData);
+  }
+
+  var reader = new SyncReader(buffer);
+
+  var parser = new Parser(options, {
+    read: reader.read.bind(reader),
+    error: handleError,
+    metadata: handleMetaData,
+    gamma: handleGamma,
+    palette: handlePalette,
+    transColor: handleTransColor,
+    inflateData: handleInflateData
+  });
+
+  parser.start();
+  reader.process();
+
+  if (err) {
+    throw err;
+  }
+
+  //join together the inflate datas
+  var inflateData = Buffer.concat(inflateDataList);
+  inflateDataList.length = 0;
+
+  var inflatedData;
+  if (metaData.interlace) {
+    inflatedData = zlib.inflateSync(inflateData);
+  } else {
+    var rowSize = ((metaData.width * metaData.bpp * metaData.depth + 7) >> 3) + 1;
+    var imageSize = rowSize * metaData.height;
+    inflatedData = inflateSync(inflateData, { chunkSize: imageSize, maxLength: imageSize });
+  }
+  inflateData = null;
+
+  if (!inflatedData || !inflatedData.length) {
+    throw new Error('bad png - invalid inflate data response');
+  }
+
+  var unfilteredData = FilterSync.process(inflatedData, metaData);
+  inflateData = null;
+
+  var bitmapData = bitmapper.dataToBitMap(unfilteredData, metaData);
+  unfilteredData = null;
+
+  var normalisedBitmapData = formatNormaliser(bitmapData, metaData);
+
+  metaData.data = normalisedBitmapData;
+  metaData.gamma = gamma || 0;
+
+  return metaData;
+};