Merge to XFA: Add embedder test for stream length beyond end of file.

fpdfsdk/src/fpdftext_embeddertest.cpp

+// Copyright 2015 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "../../testing/embedder_test.h"
+#include "../../fpdfsdk/include/fpdfview.h"
+#include "../../fpdfsdk/include/fpdftext.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+class FPDFTextEmbeddertest : public EmbedderTest {
+};
+
+// Test that the page has characters despite a bad stream length.
+TEST_F(FPDFTextEmbeddertest, StreamLengthPastEndOfFile) {
+  EXPECT_TRUE(OpenDocument("testing/resources/bug_57.pdf"));
+  FPDF_FORMHANDLE form_handle = SetFormFillEnvironment();
+  FPDF_PAGE page = LoadPage(0, form_handle);
+  EXPECT_NE(nullptr, page);
+  FPDF_TEXTPAGE textpage = FPDFText_LoadPage(page);
+  EXPECT_NE(nullptr, textpage);
+  EXPECT_EQ(13, FPDFText_CountChars(textpage));
+  ClearFormFillEnvironment(form_handle);
+}