[Courgette] Refactor: Manage AssemblyProgram and EncodedProgram with scoped_ptr.

courgette/encoded_program_fuzz_unittest.cc

 // Copyright (c) 2011 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.
 
 // Fuzz testing for EncodedProgram serialized format and assembly.
 //
 // We would like some assurance that if an EncodedProgram is malformed we will
 // not crash.  The EncodedProgram could be malformed either due to malicious
 // attack to due to an error in patch generation.
 //
 // We try a lot of arbitrary modifications to the serialized form and make sure
 // that the outcome is not a crash.
-
-#include "base/test/test_suite.h"
+#include "courgette/encoded_program.h"
 
 #include <stddef.h>
 
+#include "base/memory/scoped_ptr.h"
+#include "base/test/test_suite.h"
 #include "courgette/base_test_unittest.h"
 #include "courgette/courgette.h"
+#include "courgette/program_detector.h"
 #include "courgette/streams.h"
 
 class DecodeFuzzTest : public BaseTest {
  public:
   void FuzzExe(const char *) const;
 
  private:
   void FuzzByte(const std::string& buffer, const std::string& output,
                 size_t index) const;
   void FuzzBits(const std::string& buffer, const std::string& output,
                 size_t index, int bits_to_flip) const;
 
   // Returns true if could assemble, false if rejected.
   bool TryAssemble(const std::string& buffer, std::string* output) const;
 };
 
 // Loads an executable and does fuzz testing in the serialized format.
 void DecodeFuzzTest::FuzzExe(const char* file_name) const {
   std::string file1 = FileContents(file_name);
 
   const void* original_buffer = file1.c_str();
   size_t original_length = file1.length();
 
-  courgette::AssemblyProgram* program = NULL;
+  scoped_ptr<courgette::AssemblyProgram> program;
   const courgette::Status parse_status =
       courgette::ParseDetectedExecutable(original_buffer, original_length,
                                          &program);
   EXPECT_EQ(courgette::C_OK, parse_status);
 
-  courgette::EncodedProgram* encoded = NULL;
-
-  const courgette::Status encode_status = Encode(program, &encoded);
+  scoped_ptr<courgette::EncodedProgram> encoded;
+  const courgette::Status encode_status = Encode(*program, &encoded);
   EXPECT_EQ(courgette::C_OK, encode_status);
 
-  DeleteAssemblyProgram(program);
+  program.reset(nullptr);
 
   courgette::SinkStreamSet sinks;
-  const courgette::Status write_status = WriteEncodedProgram(encoded, &sinks);
+  const courgette::Status write_status =
+      WriteEncodedProgram(encoded.get(), &sinks);
   EXPECT_EQ(courgette::C_OK, write_status);
 
-  DeleteEncodedProgram(encoded);
+  encoded.reset(nullptr);
 
   courgette::SinkStream sink;
   bool can_collect = sinks.CopyTo(&sink);
   EXPECT_TRUE(can_collect);
 
   size_t length = sink.Length();
 
   std::string base_buffer(reinterpret_cast<const char*>(sink.Buffer()), length);
   std::string base_output;
   bool ok = TryAssemble(base_buffer, &base_output);
@@ skipping 92 matching lines @@
     if (index > 60) {                     // Beyond the origin addresses ...
       EXPECT_NE(0U, changed_byte_count);   //   ... we expect some difference.
     }
     // Currently all changes are smaller than this number:
     EXPECT_GE(45000U, changed_byte_count);
   }
 }
 
 bool DecodeFuzzTest::TryAssemble(const std::string& buffer,
                                  std::string* output) const {
-  courgette::EncodedProgram *encoded = NULL;
+  scoped_ptr<courgette::EncodedProgram> encoded;
   bool result = false;
 
   courgette::SourceStreamSet sources;
   bool can_get_source_streams = sources.Init(buffer.c_str(), buffer.length());
   if (can_get_source_streams) {
     const courgette::Status read_status =
         ReadEncodedProgram(&sources, &encoded);
     if (read_status == courgette::C_OK) {
       courgette::SinkStream assembled;
-      const courgette::Status assemble_status = Assemble(encoded, &assembled);
+      const courgette::Status assemble_status =
+          Assemble(encoded.get(), &assembled);
 
       if (assemble_status == courgette::C_OK) {
         const void* assembled_buffer = assembled.Buffer();
         size_t assembled_length = assembled.Length();
 
         output->clear();
         output->assign(reinterpret_cast<const char*>(assembled_buffer),
                        assembled_length);
         result = true;
       }
     }
   }
 
-  DeleteEncodedProgram(encoded);
-
   return result;
 }
 
 TEST_F(DecodeFuzzTest, All) {
   FuzzExe("setup1.exe");
   FuzzExe("elf-32-1.exe");
 }
 
 int main(int argc, char** argv) {
   return base::TestSuite(argc, argv).Run();
 }