Courgette: Add static method QuickDetect() to optimize program detection.

courgette/program_detector_unittest.cc

Index: courgette/program_detector_unittest.cc
diff --git a/courgette/program_detector_unittest.cc b/courgette/program_detector_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d78f72ecf4a1c6d42a36b845ef0deef41f080a0f
--- /dev/null
+++ b/courgette/program_detector_unittest.cc
@@ -0,0 +1,80 @@
+// Copyright 2016 The Chromium 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 "courgette/program_detector.h"
+
+#include <string>
+
+#include "courgette/base_test_unittest.h"
+#include "courgette/courgette.h"
+#include "courgette/disassembler.h"
+#include "courgette/disassembler_elf_32_arm.h"
+#include "courgette/disassembler_elf_32_x86.h"
+#include "courgette/disassembler_win32_x64.h"
+#include "courgette/disassembler_win32_x86.h"
+
+namespace courgette {
+
+namespace {
+
+class ProgramDetectorTest : public BaseTest {
+ public:
+  void TestQuickDetect(const std::string& test_data,
+                       ExecutableType expected_type) const;
+  void TestDetectDisassembler(const std::string& test_data,
+                              ExecutableType expected_type) const;
+};
+
+void ProgramDetectorTest::TestQuickDetect(const std::string& test_data,
+                                          ExecutableType expected_type) const {
+  // QuickDetect() should return true only for the |expected_type|.
+  EXPECT_EQ(expected_type == EXE_WIN_32_X86,
+            DisassemblerWin32X86::QuickDetect(
+                reinterpret_cast<const uint8_t*>(test_data.data()),
+                test_data.size()));
+  EXPECT_EQ(expected_type == EXE_WIN_32_X64,
+            DisassemblerWin32X64::QuickDetect(
+                reinterpret_cast<const uint8_t*>(test_data.data()),
+                test_data.size()));
+  EXPECT_EQ(expected_type == EXE_ELF_32_X86,
+            DisassemblerElf32X86::QuickDetect(
+                reinterpret_cast<const uint8_t*>(test_data.data()),
+                test_data.size()));
+  EXPECT_EQ(expected_type == EXE_ELF_32_ARM,
+            DisassemblerElf32ARM::QuickDetect(
+                reinterpret_cast<const uint8_t*>(test_data.data()),
+                test_data.size()));
+}
+
+void ProgramDetectorTest::TestDetectDisassembler(
+    const std::string& test_data,
+    ExecutableType expected_type) const {
+  ExecutableType detected_type = EXE_UNKNOWN;
+  size_t detected_length = 0;
+  DetectExecutableType(test_data.data(), test_data.size(), &detected_type,
+                       &detected_length);
+  EXPECT_EQ(expected_type, detected_type);
+  EXPECT_EQ(test_data.size(), detected_length);
+}
+
+TEST_F(ProgramDetectorTest, All) {
+  std::string win32_x86 = FileContents("setup1.exe");
+  std::string win32_x64 = FileContents("chrome64_1.exe");
+  std::string elf_32 = FileContents("elf-32-1");
+  std::string elf_arm = FileContents("elf-armv7");
+
+  TestQuickDetect(win32_x86, EXE_WIN_32_X86);
+  TestQuickDetect(win32_x64, EXE_WIN_32_X64);
+  TestQuickDetect(elf_32, EXE_ELF_32_X86);
+  TestQuickDetect(elf_arm, EXE_ELF_32_ARM);
+
+  TestDetectDisassembler(win32_x86, EXE_WIN_32_X86);
+  TestDetectDisassembler(win32_x64, EXE_WIN_32_X64);
+  TestDetectDisassembler(elf_32, EXE_ELF_32_X86);
+  TestDetectDisassembler(elf_arm, EXE_ELF_32_ARM);
+}
+
+}  // namespace
+
+}  // namespace courgette