Add unit test for CXFA_FileRead.

xfa/fxfa/app/xfa_ffapp_unittest.cpp

+// Copyright 2016 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 "xfa/fxfa/xfa_ffapp.h"
+
+#include <memory>
+
+#include "core/fpdfapi/parser/cpdf_dictionary.h"
+#include "core/fpdfapi/parser/cpdf_stream.h"
+#include "core/fxcrt/fx_memory.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/base/ptr_util.h"
+
+using UniqueFileRead =
+    std::unique_ptr<CXFA_FileRead, ReleaseDeleter<CXFA_FileRead>>;
+
+TEST(CXFAFileRead, NoStreams) {
+  std::vector<CPDF_Stream*> streams;
+  UniqueFileRead fileread(new CXFA_FileRead(streams));
+
+  uint8_t output_buffer[16];
+  memset(output_buffer, 0xbd, sizeof(output_buffer));
+  EXPECT_FALSE(fileread->ReadBlock(output_buffer, 0, 0));
+  EXPECT_EQ(0xbd, output_buffer[0]);
+}
+
+TEST(CXFAFileRead, EmptyStreams) {
+  std::vector<CPDF_Stream*> streams;
+  std::unique_ptr<CPDF_Stream> stream1 = pdfium::MakeUnique<CPDF_Stream>();
+  streams.push_back(stream1.get());
+  UniqueFileRead fileread(new CXFA_FileRead(streams));
+
+  uint8_t output_buffer[16];
+  memset(output_buffer, 0xbd, sizeof(output_buffer));
+  EXPECT_FALSE(fileread->ReadBlock(output_buffer, 0, 0));
+  EXPECT_EQ(0xbd, output_buffer[0]);
+}
+
+TEST(CXFAFileRead, NormalStreams) {
+  std::vector<CPDF_Stream*> streams;
+  std::unique_ptr<CPDF_Stream> stream1 = pdfium::MakeUnique<CPDF_Stream>();
+  std::unique_ptr<CPDF_Stream> stream2 = pdfium::MakeUnique<CPDF_Stream>();
+  std::unique_ptr<CPDF_Stream> stream3 = pdfium::MakeUnique<CPDF_Stream>();
+
+  // 16 chars total.
+  stream1->InitStream(reinterpret_cast<const uint8_t*>("one t"), 5,
+                      new CPDF_Dictionary());
+  stream2->InitStream(reinterpret_cast<const uint8_t*>("wo "), 3,
+                      new CPDF_Dictionary());
+  stream3->InitStream(reinterpret_cast<const uint8_t*>("three!!!"), 8,
+                      new CPDF_Dictionary());
+
+  streams.push_back(stream1.get());
+  streams.push_back(stream2.get());
+  streams.push_back(stream3.get());
+  UniqueFileRead fileread(new CXFA_FileRead(streams));
+
+  uint8_t output_buffer[16];
+  memset(output_buffer, 0xbd, sizeof(output_buffer));
+  EXPECT_TRUE(fileread->ReadBlock(output_buffer, 0, 0));
+  EXPECT_EQ(0xbd, output_buffer[0]);
+
+  memset(output_buffer, 0xbd, sizeof(output_buffer));
+  EXPECT_TRUE(fileread->ReadBlock(output_buffer, 1, 0));
+  EXPECT_EQ(0xbd, output_buffer[0]);
+
+  memset(output_buffer, 0xbd, sizeof(output_buffer));
+  EXPECT_TRUE(fileread->ReadBlock(output_buffer, 0, 1));
+  EXPECT_EQ(0, memcmp(output_buffer, "o", 1));
+  EXPECT_EQ(0xbd, output_buffer[1]);
+
+  memset(output_buffer, 0xbd, sizeof(output_buffer));
+  EXPECT_TRUE(fileread->ReadBlock(output_buffer, 0, sizeof(output_buffer)));
+  EXPECT_EQ(0, memcmp(output_buffer, "one two three!!!", 16));
+
+  memset(output_buffer, 0xbd, sizeof(output_buffer));
+  EXPECT_TRUE(fileread->ReadBlock(output_buffer, 2, 10));
+  EXPECT_EQ(0, memcmp(output_buffer, "e two thre", 10));
+  EXPECT_EQ(0xbd, output_buffer[11]);
+
+  memset(output_buffer, 0xbd, sizeof(output_buffer));
+  EXPECT_FALSE(fileread->ReadBlock(output_buffer, 1, sizeof(output_buffer)));
+  EXPECT_EQ(0, memcmp(output_buffer, "ne two three!!!", 15));
+  EXPECT_EQ(0xbd, output_buffer[15]);
+}