base/file_test.cpp

/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "base/file.h"

#include <gtest/gtest.h>

#include <errno.h>
#include <fcntl.h>
#include <unistd.h>

#include <string>

#include "test_utils.h"

TEST(file, ReadFileToString_ENOENT) {
  std::string s("hello");
  errno = 0;
  ASSERT_FALSE(android::base::ReadFileToString("/proc/does-not-exist", &s));
  EXPECT_EQ(ENOENT, errno);
  EXPECT_EQ("", s);  // s was cleared.
}

TEST(file, ReadFileToString_success) {
  std::string s("hello");
  ASSERT_TRUE(android::base::ReadFileToString("/proc/version", &s))
    << strerror(errno);
  EXPECT_GT(s.length(), 6U);
  EXPECT_EQ('\n', s[s.length() - 1]);
  s[5] = 0;
  EXPECT_STREQ("Linux", s.c_str());
}

TEST(file, WriteStringToFile) {
  TemporaryFile tf;
  ASSERT_TRUE(tf.fd != -1);
  ASSERT_TRUE(android::base::WriteStringToFile("abc", tf.filename))
    << strerror(errno);
  std::string s;
  ASSERT_TRUE(android::base::ReadFileToString(tf.filename, &s))
    << strerror(errno);
  EXPECT_EQ("abc", s);
}

// WriteStringToFile2 is explicitly for setting Unix permissions, which make no
// sense on Windows.
#if !defined(_WIN32)
TEST(file, WriteStringToFile2) {
  TemporaryFile tf;
  ASSERT_TRUE(tf.fd != -1);
  ASSERT_TRUE(android::base::WriteStringToFile("abc", tf.filename, 0660,
                                               getuid(), getgid()))
      << strerror(errno);
  struct stat sb;
  ASSERT_EQ(0, stat(tf.filename, &sb));
  ASSERT_EQ(0660U, static_cast<unsigned int>(sb.st_mode & ~S_IFMT));
  ASSERT_EQ(getuid(), sb.st_uid);
  ASSERT_EQ(getgid(), sb.st_gid);
  std::string s;
  ASSERT_TRUE(android::base::ReadFileToString(tf.filename, &s))
    << strerror(errno);
  EXPECT_EQ("abc", s);
}
#endif

TEST(file, WriteStringToFd) {
  TemporaryFile tf;
  ASSERT_TRUE(tf.fd != -1);
  ASSERT_TRUE(android::base::WriteStringToFd("abc", tf.fd));

  ASSERT_EQ(0, lseek(tf.fd, 0, SEEK_SET)) << strerror(errno);

  std::string s;
  ASSERT_TRUE(android::base::ReadFdToString(tf.fd, &s)) << strerror(errno);
  EXPECT_EQ("abc", s);
}

TEST(file, ReadFully) {
  int fd = open("/proc/version", O_RDONLY);
  ASSERT_NE(-1, fd) << strerror(errno);

  char buf[1024];
  memset(buf, 0, sizeof(buf));
  ASSERT_TRUE(android::base::ReadFully(fd, buf, 5));
  ASSERT_STREQ("Linux", buf);

  ASSERT_EQ(0, lseek(fd, 0, SEEK_SET)) << strerror(errno);

  ASSERT_FALSE(android::base::ReadFully(fd, buf, sizeof(buf)));

  close(fd);
}

TEST(file, WriteFully) {
  TemporaryFile tf;
  ASSERT_TRUE(tf.fd != -1);
  ASSERT_TRUE(android::base::WriteFully(tf.fd, "abc", 3));
  std::string s;
  ASSERT_TRUE(android::base::ReadFileToString(tf.filename, &s))
    << strerror(errno);
  EXPECT_EQ("abc", s);
}