First release

node_modules/mux.js/es/mp4/find-box.js

@@ -0,0 +1,45 @@
+var toUnsigned = require('../utils/bin').toUnsigned;
+
+var parseType = require('./parse-type.js');
+
+var findBox = function findBox(data, path) {
+  var results = [],
+      i,
+      size,
+      type,
+      end,
+      subresults;
+
+  if (!path.length) {
+    // short-circuit the search for empty paths
+    return null;
+  }
+
+  for (i = 0; i < data.byteLength;) {
+    size = toUnsigned(data[i] << 24 | data[i + 1] << 16 | data[i + 2] << 8 | data[i + 3]);
+    type = parseType(data.subarray(i + 4, i + 8));
+    end = size > 1 ? i + size : data.byteLength;
+
+    if (type === path[0]) {
+      if (path.length === 1) {
+        // this is the end of the path and we've found the box we were
+        // looking for
+        results.push(data.subarray(i + 8, end));
+      } else {
+        // recursively search for the next box along the path
+        subresults = findBox(data.subarray(i + 8, end), path.slice(1));
+
+        if (subresults.length) {
+          results = results.concat(subresults);
+        }
+      }
+    }
+
+    i = end;
+  } // we've finished searching all of data
+
+
+  return results;
+};
+
+module.exports = findBox;