fork from https://github.com/mozilla/pdf.js.git

test/unit/node_stream_spec.js

@@ -0,0 +1,157 @@
+/* Copyright 2017 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { AbortException, isNodeJS } from "../../src/shared/util.js";
+import { PDFNodeStream } from "../../src/display/node_stream.js";
+
+// Ensure that these tests only run in Node.js environments.
+if (!isNodeJS) {
+  throw new Error(
+    'The "node_stream" unit-tests can only be run in Node.js environments.'
+  );
+}
+
+describe("node_stream", function () {
+  const url = process.getBuiltinModule("url");
+  const cwdURL = url.pathToFileURL(process.cwd()) + "/";
+  const pdf = new URL("./test/pdfs/tracemonkey.pdf", cwdURL);
+  const pdfLength = 1016315;
+
+  it("read filesystem pdf files", async function () {
+    const stream = new PDFNodeStream({
+      url: pdf,
+      rangeChunkSize: 65536,
+      disableStream: true,
+      disableRange: true,
+    });
+
+    const fullReader = stream.getFullReader();
+
+    let isStreamingSupported, isRangeSupported;
+    const promise = fullReader.headersReady.then(() => {
+      isStreamingSupported = fullReader.isStreamingSupported;
+      isRangeSupported = fullReader.isRangeSupported;
+    });
+
+    let len = 0;
+    const read = function () {
+      return fullReader.read().then(function (result) {
+        if (result.done) {
+          return undefined;
+        }
+        len += result.value.byteLength;
+        return read();
+      });
+    };
+
+    await Promise.all([read(), promise]);
+
+    expect(isStreamingSupported).toEqual(false);
+    expect(isRangeSupported).toEqual(false);
+    expect(len).toEqual(pdfLength);
+  });
+
+  it("read custom ranges for filesystem urls", async function () {
+    const rangeSize = 32768;
+    const stream = new PDFNodeStream({
+      url: pdf,
+      length: pdfLength,
+      rangeChunkSize: rangeSize,
+      disableStream: true,
+      disableRange: false,
+    });
+
+    const fullReader = stream.getFullReader();
+
+    let isStreamingSupported, isRangeSupported, fullReaderCancelled;
+    const promise = fullReader.headersReady.then(function () {
+      isStreamingSupported = fullReader.isStreamingSupported;
+      isRangeSupported = fullReader.isRangeSupported;
+      // we shall be able to close the full reader without issues
+      fullReader.cancel(new AbortException("Don't need fullReader."));
+      fullReaderCancelled = true;
+    });
+
+    // Skipping fullReader results, requesting something from the PDF end.
+    const tailSize = pdfLength % rangeSize || rangeSize;
+
+    const range1Reader = stream.getRangeReader(
+      pdfLength - tailSize - rangeSize,
+      pdfLength - tailSize
+    );
+    const range2Reader = stream.getRangeReader(pdfLength - tailSize, pdfLength);
+
+    const result1 = { value: 0 },
+      result2 = { value: 0 };
+    const read = function (reader, lenResult) {
+      return reader.read().then(function (result) {
+        if (result.done) {
+          return undefined;
+        }
+        lenResult.value += result.value.byteLength;
+        return read(reader, lenResult);
+      });
+    };
+
+    await Promise.all([
+      read(range1Reader, result1),
+      read(range2Reader, result2),
+      promise,
+    ]);
+
+    expect(result1.value).toEqual(rangeSize);
+    expect(result2.value).toEqual(tailSize);
+    expect(isStreamingSupported).toEqual(false);
+    expect(isRangeSupported).toEqual(true);
+    expect(fullReaderCancelled).toEqual(true);
+  });
+
+  it("read filesystem pdf files (smaller than two range requests)", async function () {
+    const smallPdf = new URL("./test/pdfs/empty.pdf", cwdURL);
+    const smallLength = 4920;
+
+    const stream = new PDFNodeStream({
+      url: smallPdf,
+      rangeChunkSize: 65536,
+      disableStream: true,
+      disableRange: false,
+    });
+
+    const fullReader = stream.getFullReader();
+
+    let isStreamingSupported, isRangeSupported;
+    const promise = fullReader.headersReady.then(() => {
+      isStreamingSupported = fullReader.isStreamingSupported;
+      isRangeSupported = fullReader.isRangeSupported;
+    });
+
+    let len = 0;
+    const read = function () {
+      return fullReader.read().then(function (result) {
+        if (result.done) {
+          return undefined;
+        }
+        len += result.value.byteLength;
+        return read();
+      });
+    };
+
+    await Promise.all([read(), promise]);
+
+    expect(isStreamingSupported).toEqual(false);
+    expect(isRangeSupported).toEqual(false);
+    expect(len).toEqual(smallLength);
+  });
+});