Re-arrange fxcrt string files to match naming.

The top-level fx_string.h is kept to include all strings.
Put all fx_atof code in fx_basic_util.cpp rather than header.

Change-Id: I61fe768f2e1ddf8438d27e410929f4cff918a9a3
Reviewed-on: https://pdfium-review.googlesource.com/3530
Reviewed-by: Nicolás Peña <npm@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

1 files changed, 942 insertions, 0 deletions

diff --git a/core/fxcrt/cfx_widestring_unittest.cpp b/core/fxcrt/cfx_widestring_unittest.cpp
new file mode 100644
index 0000000000..c1728af1b1
--- /dev/null
+++ b/core/fxcrt/cfx_widestring_unittest.cpp
@@ -0,0 +1,942 @@
+// Copyright 2014 PDFium 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 "core/fxcrt/cfx_widestring.h"
+
+#include "testing/fx_string_testhelpers.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(fxcrt, WideStringOperatorSubscript) {
+  // CFX_WideString includes the NUL terminator for non-empty strings.
+  CFX_WideString abc(L"abc");
+  EXPECT_EQ(L'a', abc[0]);
+  EXPECT_EQ(L'b', abc[1]);
+  EXPECT_EQ(L'c', abc[2]);
+  EXPECT_EQ(L'\0', abc[3]);
+}
+
+TEST(fxcrt, WideStringOperatorLT) {
+  CFX_WideString empty;
+  CFX_WideString a(L"a");
+  CFX_WideString abc(L"\x0110qq");  // Comes before despite endianness.
+  CFX_WideString def(L"\x1001qq");  // Comes after despite endianness.
+
+  EXPECT_FALSE(empty < empty);
+  EXPECT_FALSE(a < a);
+  EXPECT_FALSE(abc < abc);
+  EXPECT_FALSE(def < def);
+
+  EXPECT_TRUE(empty < a);
+  EXPECT_FALSE(a < empty);
+
+  EXPECT_TRUE(empty < abc);
+  EXPECT_FALSE(abc < empty);
+
+  EXPECT_TRUE(empty < def);
+  EXPECT_FALSE(def < empty);
+
+  EXPECT_TRUE(a < abc);
+  EXPECT_FALSE(abc < a);
+
+  EXPECT_TRUE(a < def);
+  EXPECT_FALSE(def < a);
+
+  EXPECT_TRUE(abc < def);
+  EXPECT_FALSE(def < abc);
+}
+
+TEST(fxcrt, WideStringOperatorEQ) {
+  CFX_WideString null_string;
+  EXPECT_TRUE(null_string == null_string);
+
+  CFX_WideString empty_string(L"");
+  EXPECT_TRUE(empty_string == empty_string);
+  EXPECT_TRUE(empty_string == null_string);
+  EXPECT_TRUE(null_string == empty_string);
+
+  CFX_WideString deleted_string(L"hello");
+  deleted_string.Delete(0, 5);
+  EXPECT_TRUE(deleted_string == deleted_string);
+  EXPECT_TRUE(deleted_string == null_string);
+  EXPECT_TRUE(deleted_string == empty_string);
+  EXPECT_TRUE(null_string == deleted_string);
+  EXPECT_TRUE(null_string == empty_string);
+
+  CFX_WideString wide_string(L"hello");
+  EXPECT_TRUE(wide_string == wide_string);
+  EXPECT_FALSE(wide_string == null_string);
+  EXPECT_FALSE(wide_string == empty_string);
+  EXPECT_FALSE(wide_string == deleted_string);
+  EXPECT_FALSE(null_string == wide_string);
+  EXPECT_FALSE(empty_string == wide_string);
+  EXPECT_FALSE(deleted_string == wide_string);
+
+  CFX_WideString wide_string_same1(L"hello");
+  EXPECT_TRUE(wide_string == wide_string_same1);
+  EXPECT_TRUE(wide_string_same1 == wide_string);
+
+  CFX_WideString wide_string_same2(wide_string);
+  EXPECT_TRUE(wide_string == wide_string_same2);
+  EXPECT_TRUE(wide_string_same2 == wide_string);
+
+  CFX_WideString wide_string1(L"he");
+  CFX_WideString wide_string2(L"hellp");
+  CFX_WideString wide_string3(L"hellod");
+  EXPECT_FALSE(wide_string == wide_string1);
+  EXPECT_FALSE(wide_string == wide_string2);
+  EXPECT_FALSE(wide_string == wide_string3);
+  EXPECT_FALSE(wide_string1 == wide_string);
+  EXPECT_FALSE(wide_string2 == wide_string);
+  EXPECT_FALSE(wide_string3 == wide_string);
+
+  CFX_WideStringC null_string_c;
+  CFX_WideStringC empty_string_c(L"");
+  EXPECT_TRUE(null_string == null_string_c);
+  EXPECT_TRUE(null_string == empty_string_c);
+  EXPECT_TRUE(empty_string == null_string_c);
+  EXPECT_TRUE(empty_string == empty_string_c);
+  EXPECT_TRUE(deleted_string == null_string_c);
+  EXPECT_TRUE(deleted_string == empty_string_c);
+  EXPECT_TRUE(null_string_c == null_string);
+  EXPECT_TRUE(empty_string_c == null_string);
+  EXPECT_TRUE(null_string_c == empty_string);
+  EXPECT_TRUE(empty_string_c == empty_string);
+  EXPECT_TRUE(null_string_c == deleted_string);
+  EXPECT_TRUE(empty_string_c == deleted_string);
+
+  CFX_WideStringC wide_string_c_same1(L"hello");
+  EXPECT_TRUE(wide_string == wide_string_c_same1);
+  EXPECT_TRUE(wide_string_c_same1 == wide_string);
+
+  CFX_WideStringC wide_string_c1(L"he");
+  CFX_WideStringC wide_string_c2(L"hellp");
+  CFX_WideStringC wide_string_c3(L"hellod");
+  EXPECT_FALSE(wide_string == wide_string_c1);
+  EXPECT_FALSE(wide_string == wide_string_c2);
+  EXPECT_FALSE(wide_string == wide_string_c3);
+  EXPECT_FALSE(wide_string_c1 == wide_string);
+  EXPECT_FALSE(wide_string_c2 == wide_string);
+  EXPECT_FALSE(wide_string_c3 == wide_string);
+
+  const wchar_t* c_null_string = nullptr;
+  const wchar_t* c_empty_string = L"";
+  EXPECT_TRUE(null_string == c_null_string);
+  EXPECT_TRUE(null_string == c_empty_string);
+  EXPECT_TRUE(empty_string == c_null_string);
+  EXPECT_TRUE(empty_string == c_empty_string);
+  EXPECT_TRUE(deleted_string == c_null_string);
+  EXPECT_TRUE(deleted_string == c_empty_string);
+  EXPECT_TRUE(c_null_string == null_string);
+  EXPECT_TRUE(c_empty_string == null_string);
+  EXPECT_TRUE(c_null_string == empty_string);
+  EXPECT_TRUE(c_empty_string == empty_string);
+  EXPECT_TRUE(c_null_string == deleted_string);
+  EXPECT_TRUE(c_empty_string == deleted_string);
+
+  const wchar_t* c_string_same1 = L"hello";
+  EXPECT_TRUE(wide_string == c_string_same1);
+  EXPECT_TRUE(c_string_same1 == wide_string);
+
+  const wchar_t* c_string1 = L"he";
+  const wchar_t* c_string2 = L"hellp";
+  const wchar_t* c_string3 = L"hellod";
+  EXPECT_FALSE(wide_string == c_string1);
+  EXPECT_FALSE(wide_string == c_string2);
+  EXPECT_FALSE(wide_string == c_string3);
+  EXPECT_FALSE(c_string1 == wide_string);
+  EXPECT_FALSE(c_string2 == wide_string);
+  EXPECT_FALSE(c_string3 == wide_string);
+}
+
+TEST(fxcrt, WideStringOperatorNE) {
+  CFX_WideString null_string;
+  EXPECT_FALSE(null_string != null_string);
+
+  CFX_WideString empty_string(L"");
+  EXPECT_FALSE(empty_string != empty_string);
+  EXPECT_FALSE(empty_string != null_string);
+  EXPECT_FALSE(null_string != empty_string);
+
+  CFX_WideString deleted_string(L"hello");
+  deleted_string.Delete(0, 5);
+  EXPECT_FALSE(deleted_string != deleted_string);
+  EXPECT_FALSE(deleted_string != null_string);
+  EXPECT_FALSE(deleted_string != empty_string);
+  EXPECT_FALSE(null_string != deleted_string);
+  EXPECT_FALSE(null_string != empty_string);
+
+  CFX_WideString wide_string(L"hello");
+  EXPECT_FALSE(wide_string != wide_string);
+  EXPECT_TRUE(wide_string != null_string);
+  EXPECT_TRUE(wide_string != empty_string);
+  EXPECT_TRUE(wide_string != deleted_string);
+  EXPECT_TRUE(null_string != wide_string);
+  EXPECT_TRUE(empty_string != wide_string);
+  EXPECT_TRUE(deleted_string != wide_string);
+
+  CFX_WideString wide_string_same1(L"hello");
+  EXPECT_FALSE(wide_string != wide_string_same1);
+  EXPECT_FALSE(wide_string_same1 != wide_string);
+
+  CFX_WideString wide_string_same2(wide_string);
+  EXPECT_FALSE(wide_string != wide_string_same2);
+  EXPECT_FALSE(wide_string_same2 != wide_string);
+
+  CFX_WideString wide_string1(L"he");
+  CFX_WideString wide_string2(L"hellp");
+  CFX_WideString wide_string3(L"hellod");
+  EXPECT_TRUE(wide_string != wide_string1);
+  EXPECT_TRUE(wide_string != wide_string2);
+  EXPECT_TRUE(wide_string != wide_string3);
+  EXPECT_TRUE(wide_string1 != wide_string);
+  EXPECT_TRUE(wide_string2 != wide_string);
+  EXPECT_TRUE(wide_string3 != wide_string);
+
+  CFX_WideStringC null_string_c;
+  CFX_WideStringC empty_string_c(L"");
+  EXPECT_FALSE(null_string != null_string_c);
+  EXPECT_FALSE(null_string != empty_string_c);
+  EXPECT_FALSE(empty_string != null_string_c);
+  EXPECT_FALSE(empty_string != empty_string_c);
+  EXPECT_FALSE(deleted_string != null_string_c);
+  EXPECT_FALSE(deleted_string != empty_string_c);
+  EXPECT_FALSE(null_string_c != null_string);
+  EXPECT_FALSE(empty_string_c != null_string);
+  EXPECT_FALSE(null_string_c != empty_string);
+  EXPECT_FALSE(empty_string_c != empty_string);
+
+  CFX_WideStringC wide_string_c_same1(L"hello");
+  EXPECT_FALSE(wide_string != wide_string_c_same1);
+  EXPECT_FALSE(wide_string_c_same1 != wide_string);
+
+  CFX_WideStringC wide_string_c1(L"he");
+  CFX_WideStringC wide_string_c2(L"hellp");
+  CFX_WideStringC wide_string_c3(L"hellod");
+  EXPECT_TRUE(wide_string != wide_string_c1);
+  EXPECT_TRUE(wide_string != wide_string_c2);
+  EXPECT_TRUE(wide_string != wide_string_c3);
+  EXPECT_TRUE(wide_string_c1 != wide_string);
+  EXPECT_TRUE(wide_string_c2 != wide_string);
+  EXPECT_TRUE(wide_string_c3 != wide_string);
+
+  const wchar_t* c_null_string = nullptr;
+  const wchar_t* c_empty_string = L"";
+  EXPECT_FALSE(null_string != c_null_string);
+  EXPECT_FALSE(null_string != c_empty_string);
+  EXPECT_FALSE(empty_string != c_null_string);
+  EXPECT_FALSE(empty_string != c_empty_string);
+  EXPECT_FALSE(deleted_string != c_null_string);
+  EXPECT_FALSE(deleted_string != c_empty_string);
+  EXPECT_FALSE(c_null_string != null_string);
+  EXPECT_FALSE(c_empty_string != null_string);
+  EXPECT_FALSE(c_null_string != empty_string);
+  EXPECT_FALSE(c_empty_string != empty_string);
+  EXPECT_FALSE(c_null_string != deleted_string);
+  EXPECT_FALSE(c_empty_string != deleted_string);
+
+  const wchar_t* c_string_same1 = L"hello";
+  EXPECT_FALSE(wide_string != c_string_same1);
+  EXPECT_FALSE(c_string_same1 != wide_string);
+
+  const wchar_t* c_string1 = L"he";
+  const wchar_t* c_string2 = L"hellp";
+  const wchar_t* c_string3 = L"hellod";
+  EXPECT_TRUE(wide_string != c_string1);
+  EXPECT_TRUE(wide_string != c_string2);
+  EXPECT_TRUE(wide_string != c_string3);
+  EXPECT_TRUE(c_string1 != wide_string);
+  EXPECT_TRUE(c_string2 != wide_string);
+  EXPECT_TRUE(c_string3 != wide_string);
+}
+
+TEST(fxcrt, WideStringConcatInPlace) {
+  CFX_WideString fred;
+  fred.Concat(L"FRED", 4);
+  EXPECT_EQ(L"FRED", fred);
+
+  fred.Concat(L"DY", 2);
+  EXPECT_EQ(L"FREDDY", fred);
+
+  fred.Delete(3, 3);
+  EXPECT_EQ(L"FRE", fred);
+
+  fred.Concat(L"D", 1);
+  EXPECT_EQ(L"FRED", fred);
+
+  CFX_WideString copy = fred;
+  fred.Concat(L"DY", 2);
+  EXPECT_EQ(L"FREDDY", fred);
+  EXPECT_EQ(L"FRED", copy);
+
+  // Test invalid arguments.
+  copy = fred;
+  fred.Concat(L"freddy", -6);
+  CFX_WideString not_aliased(L"xxxxxx");
+  EXPECT_EQ(L"FREDDY", fred);
+  EXPECT_EQ(L"xxxxxx", not_aliased);
+}
+
+TEST(fxcrt, WideStringRemove) {
+  CFX_WideString freed(L"FREED");
+  freed.Remove(L'E');
+  EXPECT_EQ(L"FRD", freed);
+  freed.Remove(L'F');
+  EXPECT_EQ(L"RD", freed);
+  freed.Remove(L'D');
+  EXPECT_EQ(L"R", freed);
+  freed.Remove(L'X');
+  EXPECT_EQ(L"R", freed);
+  freed.Remove(L'R');
+  EXPECT_EQ(L"", freed);
+
+  CFX_WideString empty;
+  empty.Remove(L'X');
+  EXPECT_EQ(L"", empty);
+}
+
+TEST(fxcrt, WideStringRemoveCopies) {
+  CFX_WideString freed(L"FREED");
+  const wchar_t* old_buffer = freed.c_str();
+
+  // No change with single reference - no copy.
+  freed.Remove(L'Q');
+  EXPECT_EQ(L"FREED", freed);
+  EXPECT_EQ(old_buffer, freed.c_str());
+
+  // Change with single reference - no copy.
+  freed.Remove(L'E');
+  EXPECT_EQ(L"FRD", freed);
+  EXPECT_EQ(old_buffer, freed.c_str());
+
+  // No change with multiple references - no copy.
+  CFX_WideString shared(freed);
+  freed.Remove(L'Q');
+  EXPECT_EQ(L"FRD", freed);
+  EXPECT_EQ(old_buffer, freed.c_str());
+  EXPECT_EQ(old_buffer, shared.c_str());
+
+  // Change with multiple references -- must copy.
+  freed.Remove(L'D');
+  EXPECT_EQ(L"FR", freed);
+  EXPECT_NE(old_buffer, freed.c_str());
+  EXPECT_EQ(L"FRD", shared);
+  EXPECT_EQ(old_buffer, shared.c_str());
+}
+
+TEST(fxcrt, WideStringReplace) {
+  CFX_WideString fred(L"FRED");
+  fred.Replace(L"FR", L"BL");
+  EXPECT_EQ(L"BLED", fred);
+  fred.Replace(L"D", L"DDY");
+  EXPECT_EQ(L"BLEDDY", fred);
+  fred.Replace(L"LEDD", L"");
+  EXPECT_EQ(L"BY", fred);
+  fred.Replace(L"X", L"CLAMS");
+  EXPECT_EQ(L"BY", fred);
+  fred.Replace(L"BY", L"HI");
+  EXPECT_EQ(L"HI", fred);
+  fred.Replace(L"", L"CLAMS");
+  EXPECT_EQ(L"HI", fred);
+  fred.Replace(L"HI", L"");
+  EXPECT_EQ(L"", fred);
+}
+
+TEST(fxcrt, WideStringInsert) {
+  CFX_WideString fred(L"FRED");
+  fred.Insert(-1, 'X');
+  EXPECT_EQ(L"XFRED", fred);
+
+  fred.Insert(0, 'S');
+  EXPECT_EQ(L"SXFRED", fred);
+
+  fred.Insert(2, 'T');
+  EXPECT_EQ(L"SXTFRED", fred);
+
+  fred.Insert(5, 'U');
+  EXPECT_EQ(L"SXTFRUED", fred);
+
+  fred.Insert(8, 'V');
+  EXPECT_EQ(L"SXTFRUEDV", fred);
+
+  fred.Insert(12, 'P');
+  EXPECT_EQ(L"SXTFRUEDVP", fred);
+
+  {
+    CFX_WideString empty;
+    empty.Insert(-1, 'X');
+    EXPECT_EQ(L"X", empty);
+  }
+  {
+    CFX_WideString empty;
+    empty.Insert(0, 'X');
+    EXPECT_EQ(L"X", empty);
+  }
+  {
+    CFX_WideString empty;
+    empty.Insert(5, 'X');
+    EXPECT_EQ(L"X", empty);
+  }
+}
+
+TEST(fxcrt, WideStringDelete) {
+  CFX_WideString fred(L"FRED");
+  fred.Delete(0, 2);
+  EXPECT_EQ(L"ED", fred);
+  fred.Delete(1);
+  EXPECT_EQ(L"E", fred);
+  fred.Delete(-1);
+  EXPECT_EQ(L"", fred);
+  fred.Delete(1);
+  EXPECT_EQ(L"", fred);
+
+  CFX_WideString empty;
+  empty.Delete(0);
+  EXPECT_EQ(L"", empty);
+  empty.Delete(-1);
+  EXPECT_EQ(L"", empty);
+  empty.Delete(1);
+  EXPECT_EQ(L"", empty);
+}
+
+TEST(fxcrt, WideStringMid) {
+  CFX_WideString fred(L"FRED");
+  EXPECT_EQ(L"", fred.Mid(0, 0));
+  EXPECT_EQ(L"", fred.Mid(3, 0));
+  EXPECT_EQ(L"FRED", fred.Mid(0));
+  EXPECT_EQ(L"RED", fred.Mid(1));
+  EXPECT_EQ(L"ED", fred.Mid(2));
+  EXPECT_EQ(L"D", fred.Mid(3));
+  EXPECT_EQ(L"F", fred.Mid(0, 1));
+  EXPECT_EQ(L"R", fred.Mid(1, 1));
+  EXPECT_EQ(L"E", fred.Mid(2, 1));
+  EXPECT_EQ(L"D", fred.Mid(3, 1));
+  EXPECT_EQ(L"FR", fred.Mid(0, 2));
+  EXPECT_EQ(L"FRED", fred.Mid(0, 4));
+  EXPECT_EQ(L"FRED", fred.Mid(0, 10));
+
+  EXPECT_EQ(L"FR", fred.Mid(-1, 2));
+  EXPECT_EQ(L"RED", fred.Mid(1, 4));
+  EXPECT_EQ(L"", fred.Mid(4, 1));
+
+  CFX_WideString empty;
+  EXPECT_EQ(L"", empty.Mid(0, 0));
+  EXPECT_EQ(L"", empty.Mid(0));
+  EXPECT_EQ(L"", empty.Mid(1));
+  EXPECT_EQ(L"", empty.Mid(-1));
+}
+
+TEST(fxcrt, WideStringLeft) {
+  CFX_WideString fred(L"FRED");
+  EXPECT_EQ(L"", fred.Left(0));
+  EXPECT_EQ(L"F", fred.Left(1));
+  EXPECT_EQ(L"FR", fred.Left(2));
+  EXPECT_EQ(L"FRE", fred.Left(3));
+  EXPECT_EQ(L"FRED", fred.Left(4));
+
+  EXPECT_EQ(L"FRED", fred.Left(5));
+  EXPECT_EQ(L"", fred.Left(-1));
+
+  CFX_WideString empty;
+  EXPECT_EQ(L"", empty.Left(0));
+  EXPECT_EQ(L"", empty.Left(1));
+  EXPECT_EQ(L"", empty.Left(-1));
+}
+
+TEST(fxcrt, WideStringRight) {
+  CFX_WideString fred(L"FRED");
+  EXPECT_EQ(L"", fred.Right(0));
+  EXPECT_EQ(L"D", fred.Right(1));
+  EXPECT_EQ(L"ED", fred.Right(2));
+  EXPECT_EQ(L"RED", fred.Right(3));
+  EXPECT_EQ(L"FRED", fred.Right(4));
+
+  EXPECT_EQ(L"FRED", fred.Right(5));
+  EXPECT_EQ(L"", fred.Right(-1));
+
+  CFX_WideString empty;
+  EXPECT_EQ(L"", empty.Right(0));
+  EXPECT_EQ(L"", empty.Right(1));
+  EXPECT_EQ(L"", empty.Right(-1));
+}
+
+TEST(fxcrt, WideStringUpperLower) {
+  CFX_WideString fred(L"F-Re.42D");
+  fred.MakeLower();
+  EXPECT_EQ(L"f-re.42d", fred);
+  fred.MakeUpper();
+  EXPECT_EQ(L"F-RE.42D", fred);
+
+  CFX_WideString empty;
+  empty.MakeLower();
+  EXPECT_EQ(L"", empty);
+  empty.MakeUpper();
+  EXPECT_EQ(L"", empty);
+}
+
+TEST(fxcrt, WideStringTrimRight) {
+  CFX_WideString fred(L"  FRED  ");
+  fred.TrimRight();
+  EXPECT_EQ(L"  FRED", fred);
+  fred.TrimRight(L'E');
+  EXPECT_EQ(L"  FRED", fred);
+  fred.TrimRight(L'D');
+  EXPECT_EQ(L"  FRE", fred);
+  fred.TrimRight(L"ERP");
+  EXPECT_EQ(L"  F", fred);
+
+  CFX_WideString blank(L"   ");
+  blank.TrimRight(L"ERP");
+  EXPECT_EQ(L"   ", blank);
+  blank.TrimRight(L'E');
+  EXPECT_EQ(L"   ", blank);
+  blank.TrimRight();
+  EXPECT_EQ(L"", blank);
+
+  CFX_WideString empty;
+  empty.TrimRight(L"ERP");
+  EXPECT_EQ(L"", empty);
+  empty.TrimRight(L'E');
+  EXPECT_EQ(L"", empty);
+  empty.TrimRight();
+  EXPECT_EQ(L"", empty);
+}
+
+TEST(fxcrt, WideStringTrimRightCopies) {
+  {
+    // With a single reference, no copy takes place.
+    CFX_WideString fred(L"  FRED  ");
+    const wchar_t* old_buffer = fred.c_str();
+    fred.TrimRight();
+    EXPECT_EQ(L"  FRED", fred);
+    EXPECT_EQ(old_buffer, fred.c_str());
+  }
+  {
+    // With multiple references, we must copy.
+    CFX_WideString fred(L"  FRED  ");
+    CFX_WideString other_fred = fred;
+    const wchar_t* old_buffer = fred.c_str();
+    fred.TrimRight();
+    EXPECT_EQ(L"  FRED", fred);
+    EXPECT_EQ(L"  FRED  ", other_fred);
+    EXPECT_NE(old_buffer, fred.c_str());
+  }
+  {
+    // With multiple references, but no modifications, no copy.
+    CFX_WideString fred(L"FRED");
+    CFX_WideString other_fred = fred;
+    const wchar_t* old_buffer = fred.c_str();
+    fred.TrimRight();
+    EXPECT_EQ(L"FRED", fred);
+    EXPECT_EQ(L"FRED", other_fred);
+    EXPECT_EQ(old_buffer, fred.c_str());
+  }
+}
+
+TEST(fxcrt, WideStringTrimLeft) {
+  CFX_WideString fred(L"  FRED  ");
+  fred.TrimLeft();
+  EXPECT_EQ(L"FRED  ", fred);
+  fred.TrimLeft(L'E');
+  EXPECT_EQ(L"FRED  ", fred);
+  fred.TrimLeft(L'F');
+  EXPECT_EQ(L"RED  ", fred);
+  fred.TrimLeft(L"ERP");
+  EXPECT_EQ(L"D  ", fred);
+
+  CFX_WideString blank(L"   ");
+  blank.TrimLeft(L"ERP");
+  EXPECT_EQ(L"   ", blank);
+  blank.TrimLeft(L'E');
+  EXPECT_EQ(L"   ", blank);
+  blank.TrimLeft();
+  EXPECT_EQ(L"", blank);
+
+  CFX_WideString empty;
+  empty.TrimLeft(L"ERP");
+  EXPECT_EQ(L"", empty);
+  empty.TrimLeft(L'E');
+  EXPECT_EQ(L"", empty);
+  empty.TrimLeft();
+  EXPECT_EQ(L"", empty);
+}
+
+TEST(fxcrt, WideStringTrimLeftCopies) {
+  {
+    // With a single reference, no copy takes place.
+    CFX_WideString fred(L"  FRED  ");
+    const wchar_t* old_buffer = fred.c_str();
+    fred.TrimLeft();
+    EXPECT_EQ(L"FRED  ", fred);
+    EXPECT_EQ(old_buffer, fred.c_str());
+  }
+  {
+    // With multiple references, we must copy.
+    CFX_WideString fred(L"  FRED  ");
+    CFX_WideString other_fred = fred;
+    const wchar_t* old_buffer = fred.c_str();
+    fred.TrimLeft();
+    EXPECT_EQ(L"FRED  ", fred);
+    EXPECT_EQ(L"  FRED  ", other_fred);
+    EXPECT_NE(old_buffer, fred.c_str());
+  }
+  {
+    // With multiple references, but no modifications, no copy.
+    CFX_WideString fred(L"FRED");
+    CFX_WideString other_fred = fred;
+    const wchar_t* old_buffer = fred.c_str();
+    fred.TrimLeft();
+    EXPECT_EQ(L"FRED", fred);
+    EXPECT_EQ(L"FRED", other_fred);
+    EXPECT_EQ(old_buffer, fred.c_str());
+  }
+}
+
+TEST(fxcrt, WideStringReserve) {
+  {
+    CFX_WideString str;
+    str.Reserve(6);
+    const wchar_t* old_buffer = str.c_str();
+    str += L"ABCDEF";
+    EXPECT_EQ(old_buffer, str.c_str());
+    str += L"Blah Blah Blah Blah Blah Blah";
+    EXPECT_NE(old_buffer, str.c_str());
+  }
+  {
+    CFX_WideString str(L"A");
+    str.Reserve(6);
+    const wchar_t* old_buffer = str.c_str();
+    str += L"BCDEF";
+    EXPECT_EQ(old_buffer, str.c_str());
+    str += L"Blah Blah Blah Blah Blah Blah";
+    EXPECT_NE(old_buffer, str.c_str());
+  }
+}
+
+TEST(fxcrt, WideStringGetBuffer) {
+  {
+    CFX_WideString str;
+    wchar_t* buffer = str.GetBuffer(12);
+    wcscpy(buffer, L"clams");
+    str.ReleaseBuffer();
+    EXPECT_EQ(L"clams", str);
+  }
+  {
+    CFX_WideString str(L"cl");
+    wchar_t* buffer = str.GetBuffer(12);
+    wcscpy(buffer + 2, L"ams");
+    str.ReleaseBuffer();
+    EXPECT_EQ(L"clams", str);
+  }
+}
+
+TEST(fxcrt, WideStringReleaseBuffer) {
+  {
+    CFX_WideString str;
+    str.Reserve(12);
+    str += L"clams";
+    const wchar_t* old_buffer = str.c_str();
+    str.ReleaseBuffer(4);
+    EXPECT_EQ(old_buffer, str.c_str());
+    EXPECT_EQ(L"clam", str);
+  }
+  {
+    CFX_WideString str(L"c");
+    str.Reserve(12);
+    str += L"lams";
+    const wchar_t* old_buffer = str.c_str();
+    str.ReleaseBuffer(4);
+    EXPECT_EQ(old_buffer, str.c_str());
+    EXPECT_EQ(L"clam", str);
+  }
+  {
+    CFX_WideString str;
+    str.Reserve(200);
+    str += L"clams";
+    const wchar_t* old_buffer = str.c_str();
+    str.ReleaseBuffer(4);
+    EXPECT_NE(old_buffer, str.c_str());
+    EXPECT_EQ(L"clam", str);
+  }
+  {
+    CFX_WideString str(L"c");
+    str.Reserve(200);
+    str += L"lams";
+    const wchar_t* old_buffer = str.c_str();
+    str.ReleaseBuffer(4);
+    EXPECT_NE(old_buffer, str.c_str());
+    EXPECT_EQ(L"clam", str);
+  }
+}
+
+TEST(fxcrt, WideStringUTF16LE_Encode) {
+  struct UTF16LEEncodeCase {
+    CFX_WideString ws;
+    CFX_ByteString bs;
+  } utf16le_encode_cases[] = {
+      {L"", CFX_ByteString("\0\0", 2)},
+      {L"abc", CFX_ByteString("a\0b\0c\0\0\0", 8)},
+      {L"abcdef", CFX_ByteString("a\0b\0c\0d\0e\0f\0\0\0", 14)},
+      {L"abc\0def", CFX_ByteString("a\0b\0c\0\0\0", 8)},
+      {L"\xaabb\xccdd", CFX_ByteString("\xbb\xaa\xdd\xcc\0\0", 6)},
+      {L"\x3132\x6162", CFX_ByteString("\x32\x31\x62\x61\0\0", 6)},
+  };
+
+  for (size_t i = 0; i < FX_ArraySize(utf16le_encode_cases); ++i) {
+    EXPECT_EQ(utf16le_encode_cases[i].bs,
+              utf16le_encode_cases[i].ws.UTF16LE_Encode())
+        << " for case number " << i;
+  }
+}
+
+TEST(fxcrt, WideStringCOperatorSubscript) {
+  // CFX_WideStringC includes the NUL terminator for non-empty strings.
+  CFX_WideStringC abc(L"abc");
+  EXPECT_EQ(L'a', abc.CharAt(0));
+  EXPECT_EQ(L'b', abc.CharAt(1));
+  EXPECT_EQ(L'c', abc.CharAt(2));
+  EXPECT_EQ(L'\0', abc.CharAt(3));
+}
+
+TEST(fxcrt, WideStringCOperatorLT) {
+  CFX_WideStringC empty;
+  CFX_WideStringC a(L"a");
+  CFX_WideStringC abc(L"\x0110qq");  // Comes before despite endianness.
+  CFX_WideStringC def(L"\x1001qq");  // Comes after despite endianness.
+
+  EXPECT_FALSE(empty < empty);
+  EXPECT_FALSE(a < a);
+  EXPECT_FALSE(abc < abc);
+  EXPECT_FALSE(def < def);
+
+  EXPECT_TRUE(empty < a);
+  EXPECT_FALSE(a < empty);
+
+  EXPECT_TRUE(empty < abc);
+  EXPECT_FALSE(abc < empty);
+
+  EXPECT_TRUE(empty < def);
+  EXPECT_FALSE(def < empty);
+
+  EXPECT_TRUE(a < abc);
+  EXPECT_FALSE(abc < a);
+
+  EXPECT_TRUE(a < def);
+  EXPECT_FALSE(def < a);
+
+  EXPECT_TRUE(abc < def);
+  EXPECT_FALSE(def < abc);
+}
+
+TEST(fxcrt, WideStringCOperatorEQ) {
+  CFX_WideStringC wide_string_c(L"hello");
+  EXPECT_TRUE(wide_string_c == wide_string_c);
+
+  CFX_WideStringC wide_string_c_same1(L"hello");
+  EXPECT_TRUE(wide_string_c == wide_string_c_same1);
+  EXPECT_TRUE(wide_string_c_same1 == wide_string_c);
+
+  CFX_WideStringC wide_string_c_same2(wide_string_c);
+  EXPECT_TRUE(wide_string_c == wide_string_c_same2);
+  EXPECT_TRUE(wide_string_c_same2 == wide_string_c);
+
+  CFX_WideStringC wide_string_c1(L"he");
+  CFX_WideStringC wide_string_c2(L"hellp");
+  CFX_WideStringC wide_string_c3(L"hellod");
+  EXPECT_FALSE(wide_string_c == wide_string_c1);
+  EXPECT_FALSE(wide_string_c == wide_string_c2);
+  EXPECT_FALSE(wide_string_c == wide_string_c3);
+  EXPECT_FALSE(wide_string_c1 == wide_string_c);
+  EXPECT_FALSE(wide_string_c2 == wide_string_c);
+  EXPECT_FALSE(wide_string_c3 == wide_string_c);
+
+  CFX_WideString wide_string_same1(L"hello");
+  EXPECT_TRUE(wide_string_c == wide_string_same1);
+  EXPECT_TRUE(wide_string_same1 == wide_string_c);
+
+  CFX_WideString wide_string1(L"he");
+  CFX_WideString wide_string2(L"hellp");
+  CFX_WideString wide_string3(L"hellod");
+  EXPECT_FALSE(wide_string_c == wide_string1);
+  EXPECT_FALSE(wide_string_c == wide_string2);
+  EXPECT_FALSE(wide_string_c == wide_string3);
+  EXPECT_FALSE(wide_string1 == wide_string_c);
+  EXPECT_FALSE(wide_string2 == wide_string_c);
+  EXPECT_FALSE(wide_string3 == wide_string_c);
+
+  const wchar_t* c_string_same1 = L"hello";
+  EXPECT_TRUE(wide_string_c == c_string_same1);
+  EXPECT_TRUE(c_string_same1 == wide_string_c);
+
+  const wchar_t* c_string1 = L"he";
+  const wchar_t* c_string2 = L"hellp";
+  const wchar_t* c_string3 = L"hellod";
+  EXPECT_FALSE(wide_string_c == c_string1);
+  EXPECT_FALSE(wide_string_c == c_string2);
+  EXPECT_FALSE(wide_string_c == c_string3);
+
+  EXPECT_FALSE(c_string1 == wide_string_c);
+  EXPECT_FALSE(c_string2 == wide_string_c);
+  EXPECT_FALSE(c_string3 == wide_string_c);
+}
+
+TEST(fxcrt, WideStringCOperatorNE) {
+  CFX_WideStringC wide_string_c(L"hello");
+  EXPECT_FALSE(wide_string_c != wide_string_c);
+
+  CFX_WideStringC wide_string_c_same1(L"hello");
+  EXPECT_FALSE(wide_string_c != wide_string_c_same1);
+  EXPECT_FALSE(wide_string_c_same1 != wide_string_c);
+
+  CFX_WideStringC wide_string_c_same2(wide_string_c);
+  EXPECT_FALSE(wide_string_c != wide_string_c_same2);
+  EXPECT_FALSE(wide_string_c_same2 != wide_string_c);
+
+  CFX_WideStringC wide_string_c1(L"he");
+  CFX_WideStringC wide_string_c2(L"hellp");
+  CFX_WideStringC wide_string_c3(L"hellod");
+  EXPECT_TRUE(wide_string_c != wide_string_c1);
+  EXPECT_TRUE(wide_string_c != wide_string_c2);
+  EXPECT_TRUE(wide_string_c != wide_string_c3);
+  EXPECT_TRUE(wide_string_c1 != wide_string_c);
+  EXPECT_TRUE(wide_string_c2 != wide_string_c);
+  EXPECT_TRUE(wide_string_c3 != wide_string_c);
+
+  CFX_WideString wide_string_same1(L"hello");
+  EXPECT_FALSE(wide_string_c != wide_string_same1);
+  EXPECT_FALSE(wide_string_same1 != wide_string_c);
+
+  CFX_WideString wide_string1(L"he");
+  CFX_WideString wide_string2(L"hellp");
+  CFX_WideString wide_string3(L"hellod");
+  EXPECT_TRUE(wide_string_c != wide_string1);
+  EXPECT_TRUE(wide_string_c != wide_string2);
+  EXPECT_TRUE(wide_string_c != wide_string3);
+  EXPECT_TRUE(wide_string1 != wide_string_c);
+  EXPECT_TRUE(wide_string2 != wide_string_c);
+  EXPECT_TRUE(wide_string3 != wide_string_c);
+
+  const wchar_t* c_string_same1 = L"hello";
+  EXPECT_FALSE(wide_string_c != c_string_same1);
+  EXPECT_FALSE(c_string_same1 != wide_string_c);
+
+  const wchar_t* c_string1 = L"he";
+  const wchar_t* c_string2 = L"hellp";
+  const wchar_t* c_string3 = L"hellod";
+  EXPECT_TRUE(wide_string_c != c_string1);
+  EXPECT_TRUE(wide_string_c != c_string2);
+  EXPECT_TRUE(wide_string_c != c_string3);
+
+  EXPECT_TRUE(c_string1 != wide_string_c);
+  EXPECT_TRUE(c_string2 != wide_string_c);
+  EXPECT_TRUE(c_string3 != wide_string_c);
+}
+
+TEST(fxcrt, WideStringCFind) {
+  CFX_WideStringC null_string;
+  EXPECT_EQ(-1, null_string.Find(L'a'));
+  EXPECT_EQ(-1, null_string.Find(0));
+
+  CFX_WideStringC empty_string(L"");
+  EXPECT_EQ(-1, empty_string.Find(L'a'));
+  EXPECT_EQ(-1, empty_string.Find(0));
+
+  CFX_WideStringC single_string(L"a");
+  EXPECT_EQ(0, single_string.Find(L'a'));
+  EXPECT_EQ(-1, single_string.Find(L'b'));
+  EXPECT_EQ(-1, single_string.Find(0));
+
+  CFX_WideStringC longer_string(L"abccc");
+  EXPECT_EQ(0, longer_string.Find(L'a'));
+  EXPECT_EQ(2, longer_string.Find(L'c'));
+  EXPECT_EQ(-1, longer_string.Find(0));
+
+  CFX_WideStringC hibyte_string(
+      L"ab\xff08"
+      L"def");
+  EXPECT_EQ(2, hibyte_string.Find(L'\xff08'));
+}
+
+TEST(fxcrt, WideStringFormatWidth) {
+  {
+    CFX_WideString str;
+    str.Format(L"%5d", 1);
+    EXPECT_EQ(L"    1", str);
+  }
+
+  {
+    CFX_WideString str;
+    str.Format(L"%d", 1);
+    EXPECT_EQ(L"1", str);
+  }
+
+  {
+    CFX_WideString str;
+    str.Format(L"%*d", 5, 1);
+    EXPECT_EQ(L"    1", str);
+  }
+
+  {
+    CFX_WideString str;
+    str.Format(L"%-1d", 1);
+    EXPECT_EQ(L"1", str);
+  }
+
+  {
+    CFX_WideString str;
+    str.Format(L"%0d", 1);
+    EXPECT_EQ(L"1", str);
+  }
+
+  {
+    CFX_WideString str;
+    str.Format(L"%1048576d", 1);
+    EXPECT_EQ(L"", str);
+  }
+}
+
+TEST(fxcrt, WideStringFormatPrecision) {
+  {
+    CFX_WideString str;
+    str.Format(L"%.2f", 1.12345);
+    EXPECT_EQ(L"1.12", str);
+  }
+
+  {
+    CFX_WideString str;
+    str.Format(L"%.*f", 3, 1.12345);
+    EXPECT_EQ(L"1.123", str);
+  }
+
+  {
+    CFX_WideString str;
+    str.Format(L"%f", 1.12345);
+    EXPECT_EQ(L"1.123450", str);
+  }
+
+  {
+    CFX_WideString str;
+    str.Format(L"%-1f", 1.12345);
+    EXPECT_EQ(L"1.123450", str);
+  }
+
+  {
+    CFX_WideString str;
+    str.Format(L"%0f", 1.12345);
+    EXPECT_EQ(L"1.123450", str);
+  }
+
+  {
+    CFX_WideString str;
+    str.Format(L"%.1048576f", 1.2);
+    EXPECT_EQ(L"", str);
+  }
+}
+
+TEST(fxcrt, EmptyWideString) {
+  CFX_WideString empty_str;
+  EXPECT_TRUE(empty_str.IsEmpty());
+  EXPECT_EQ(0, empty_str.GetLength());
+  const wchar_t* cstr = empty_str.c_str();
+  EXPECT_EQ(0, FXSYS_wcslen(cstr));
+}