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#include "base/mmap.h"

#include <string.h>

#include "base/file_stream.h"
#include "base/file_util.h"
#include "base/scoped_ptr.h"
#include "base/util.h"
#include "testing/base/public/gunit.h"

DECLARE_string(test_tmpdir);

namespace mozc {
namespace {

TEST(MmapTest, MmapTest) {
  const string filename = FileUtil::JoinPath(FLAGS_test_tmpdir, "test.db");

  const size_t kFileNameSize[] = { 1, 100, 1024, 8192 };
  for (int i = 0; i < arraysize(kFileNameSize); ++i) {
    FileUtil::Unlink(filename);
    scoped_ptr<char[]> buf(new char[kFileNameSize[i]]);
    memset(buf.get(), 0, kFileNameSize[i]);

    {
      OutputFileStream ofs(filename.c_str(),
                           ios::out | ios::binary);
      EXPECT_TRUE(ofs.good());
      ofs.write(buf.get(), kFileNameSize[i]);
    }

    Util::GetRandomSequence(buf.get(), kFileNameSize[i]);

    // Write Test
    {
      Mmap mmap;
      EXPECT_TRUE(mmap.Open(filename.c_str(), "r+"));
      memcpy(mmap.begin(), buf.get(), kFileNameSize[i]);

      for (int j = 0; j < kFileNameSize[i]; ++j) {
        EXPECT_EQ(buf[j], mmap[j]);
      }

      memset(mmap.begin(), 0, kFileNameSize[i]);

      for (int j = 0; j < kFileNameSize[i]; ++j) {
        EXPECT_EQ(0, mmap[j]);
      }

      for (int j = 0; j < kFileNameSize[i]; ++j) {
        mmap[j] = buf[j];
      }

      for (int j = 0; j < kFileNameSize[i]; ++j) {
        EXPECT_EQ(buf[j], mmap[j]);
      }
    }

    // Read test
    {
      Mmap mmap;
      EXPECT_TRUE(mmap.Open(filename.c_str(), "r"));
      for (int j = 0; j < kFileNameSize[i]; ++j) {
        EXPECT_EQ(buf[j], mmap[j]);
      }
    }

    FileUtil::Unlink(filename);
  }
}
}  // namespace
}  // namespace mozc