done purchases remove, ocr scan, read image

express-server/node_modules/charenc/charenc.js

@@ -0,0 +1,33 @@
+var charenc = {
+  // UTF-8 encoding
+  utf8: {
+    // Convert a string to a byte array
+    stringToBytes: function(str) {
+      return charenc.bin.stringToBytes(unescape(encodeURIComponent(str)));
+    },
+
+    // Convert a byte array to a string
+    bytesToString: function(bytes) {
+      return decodeURIComponent(escape(charenc.bin.bytesToString(bytes)));
+    }
+  },
+
+  // Binary encoding
+  bin: {
+    // Convert a string to a byte array
+    stringToBytes: function(str) {
+      for (var bytes = [], i = 0; i < str.length; i++)
+        bytes.push(str.charCodeAt(i) & 0xFF);
+      return bytes;
+    },
+
+    // Convert a byte array to a string
+    bytesToString: function(bytes) {
+      for (var str = [], i = 0; i < bytes.length; i++)
+        str.push(String.fromCharCode(bytes[i]));
+      return str.join('');
+    }
+  }
+};
+
+module.exports = charenc;