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gaia/dev_apps/music-oga/test/unit/metadata/utils.js

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+/* global BlobView */
+/* exported fetchBlobView, fetchBuffer, readPicSlice, assertBuffersEqual */
+
+'use strict';
+
+require('/shared/js/blobview.js');
+require('/js/metadata/formats.js');
+require('/test/unit/mock_lazy_loader.js');
+require('/test/unit/utils.js');
+
+function fetchBuffer(url) {
+  return new Promise(function(resolve, reject) {
+    var xhr = new XMLHttpRequest();
+    xhr.open('GET', url);
+    xhr.onload = function() {
+      if (xhr.status !== 200) {
+        reject(new Error('Failed with status: ' + xhr.status));
+      } else {
+        resolve(this.response);
+      }
+    };
+    xhr.onerror = xhr.ontimeout = function() {
+      reject(new Error('Failed'));
+    };
+    xhr.responseType = 'arraybuffer';
+    xhr.send();
+  });
+}
+
+function makeBlobView(blob, size) {
+  if (size === undefined) {
+    size = 64 * 1024;
+  }
+
+  return new Promise(function(resolve, reject) {
+    BlobView.get(blob, 0, size, function(blobview, error) {
+      if (error) {
+        reject(error);
+        return;
+      }
+      resolve(blobview);
+    });
+  });
+}
+
+function fetchBlobView(url, size) {
+  return fetchBuffer(url).then(function(buffer) {
+    return makeBlobView(new Blob([buffer]), size);
+  });
+}
+
+function readBlob(blob) {
+  return new Promise(function(resolve, reject) {
+    var reader = new FileReader();
+    reader.readAsArrayBuffer(blob);
+    reader.onload = function(event) {
+      resolve(reader.result);
+    };
+    reader.onerror = function(event) {
+      reject(event.target.error);
+    };
+  });
+}
+
+function readPicSlice(blob, picture) {
+  var slice = blob.slice(picture.start, picture.end, picture.type);
+  return readBlob(slice);
+}
+
+function assertBuffersEqual(a, b) {
+  return assert.deepEqual(new Uint8Array(a), new Uint8Array(b));
+}