Add FileReaderInterface::ReadExactly() and FileSeekerInterface::SeekSet()

util/file/string_file_test.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // 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,
@@ skipping 99 matching lines @@
   EXPECT_EQ(4, string_file.Seek(0, SEEK_CUR));
   string_file.SetString(kString3);
   EXPECT_EQ(0, string_file.Seek(0, SEEK_CUR));
   EXPECT_EQ(4, string_file.Read(buf, 4));
   EXPECT_STREQ("our ", buf);
   EXPECT_EQ(static_cast<FileOffset>(strlen(kString3)),
             string_file.Seek(0, SEEK_END));
   EXPECT_EQ(kString3, string_file.string());
 }
 
+TEST(StringFile, ReadExactly) {
+  StringFile string_file;
+  string_file.SetString("1234567");
+  char buf[4] = "***";
+  EXPECT_TRUE(string_file.ReadExactly(buf, 3));
+  EXPECT_STREQ("123", buf);
+  EXPECT_TRUE(string_file.ReadExactly(buf, 3));
+  EXPECT_STREQ("456", buf);
+  EXPECT_FALSE(string_file.ReadExactly(buf, 3));
+}
+
 TEST(StringFile, Reset) {
   StringFile string_file;
 
   EXPECT_TRUE(string_file.Write("abc", 3));
   EXPECT_EQ(3u, string_file.string().size());
   EXPECT_EQ("abc", string_file.string());
   EXPECT_EQ(3, string_file.Seek(0, SEEK_CUR));
   char buf[10] = "*********";
   EXPECT_EQ(0, string_file.Seek(0, SEEK_SET));
   EXPECT_EQ(3, string_file.Read(&buf, 10));
@@ skipping 328 matching lines @@
 
   EXPECT_EQ(kMaxOffset, string_file.Seek(kMaxOffset, SEEK_SET));
   EXPECT_EQ(kMaxOffset, string_file.Seek(0, SEEK_CUR));
   EXPECT_LT(string_file.Seek(1, SEEK_CUR), 0);
 
   EXPECT_EQ(1, string_file.Seek(1, SEEK_SET));
   EXPECT_EQ(1, string_file.Seek(0, SEEK_CUR));
   EXPECT_LT(string_file.Seek(kMaxOffset, SEEK_CUR), 0);
 }
 
+TEST(StringFile, SeekSet) {
+  StringFile string_file;
+  EXPECT_TRUE(string_file.SeekSet(1));
+  EXPECT_EQ(1, string_file.Seek(0, SEEK_CUR));
+  EXPECT_TRUE(string_file.SeekSet(0));
+  EXPECT_EQ(0, string_file.Seek(0, SEEK_CUR));
+  EXPECT_TRUE(string_file.SeekSet(10));
+  EXPECT_EQ(10, string_file.Seek(0, SEEK_CUR));
+  EXPECT_FALSE(string_file.SeekSet(-1));
+  EXPECT_EQ(10, string_file.Seek(0, SEEK_CUR));
+  EXPECT_FALSE(string_file.SeekSet(std::numeric_limits<ssize_t>::min()));
+  EXPECT_EQ(10, string_file.Seek(0, SEEK_CUR));
+  EXPECT_FALSE(string_file.SeekSet(std::numeric_limits<FileOffset>::min()));
+  EXPECT_EQ(10, string_file.Seek(0, SEEK_CUR));
+}
+
 }  // namespace
 }  // namespace test
 }  // namespace crashpad