Convert string class names

Automated using git grep & sed.
Replace StringC classes with StringView classes.
Remove the CFX_ prefix and put string classes in fxcrt namespace.
Change AsStringC() to AsStringView().
Rename tests from TEST(fxcrt, *String*Foo) to TEST(*String*,
Foo).
Couple of tests needed to have their names regularlized.

BUG=pdfium:894

Change-Id: I7ca038685c8d803795f3ed02545124f7a224c83d
Reviewed-on: https://pdfium-review.googlesource.com/14151
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>

1 files changed, 1054 insertions, 0 deletions

diff --git a/core/fxcrt/widestring.cpp b/core/fxcrt/widestring.cpp
new file mode 100644
index 0000000000..fa5c80130d
--- /dev/null
+++ b/core/fxcrt/widestring.cpp
@@ -0,0 +1,1054 @@
+// 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.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "core/fxcrt/widestring.h"
+
+#include <stddef.h>
+
+#include <algorithm>
+#include <cctype>
+#include <cwctype>
+
+#include "core/fxcrt/cfx_string_pool_template.h"
+#include "core/fxcrt/cfx_utf8decoder.h"
+#include "core/fxcrt/fx_codepage.h"
+#include "core/fxcrt/fx_extension.h"
+#include "core/fxcrt/fx_safe_types.h"
+#include "third_party/base/numerics/safe_math.h"
+#include "third_party/base/stl_util.h"
+
+template class CFX_StringDataTemplate<wchar_t>;
+template class fxcrt::StringViewTemplate<wchar_t>;
+template class CFX_StringPoolTemplate<WideString>;
+template struct std::hash<WideString>;
+
+#define FORCE_ANSI 0x10000
+#define FORCE_UNICODE 0x20000
+#define FORCE_INT64 0x40000
+
+namespace {
+
+const wchar_t* FX_wcsstr(const wchar_t* haystack,
+                         int haystack_len,
+                         const wchar_t* needle,
+                         int needle_len) {
+  if (needle_len > haystack_len || needle_len == 0) {
+    return nullptr;
+  }
+  const wchar_t* end_ptr = haystack + haystack_len - needle_len;
+  while (haystack <= end_ptr) {
+    int i = 0;
+    while (1) {
+      if (haystack[i] != needle[i]) {
+        break;
+      }
+      i++;
+      if (i == needle_len) {
+        return haystack;
+      }
+    }
+    haystack++;
+  }
+  return nullptr;
+}
+
+pdfium::Optional<FX_STRSIZE> GuessSizeForVSWPrintf(const wchar_t* pFormat,
+                                                   va_list argList) {
+  FX_STRSIZE nMaxLen = 0;
+  for (const wchar_t* pStr = pFormat; *pStr != 0; pStr++) {
+    if (*pStr != '%' || *(pStr = pStr + 1) == '%') {
+      ++nMaxLen;
+      continue;
+    }
+    int nItemLen = 0;
+    int nWidth = 0;
+    for (; *pStr != 0; pStr++) {
+      if (*pStr == '#') {
+        nMaxLen += 2;
+      } else if (*pStr == '*') {
+        nWidth = va_arg(argList, int);
+      } else if (*pStr != '-' && *pStr != '+' && *pStr != '0' && *pStr != ' ') {
+        break;
+      }
+    }
+    if (nWidth == 0) {
+      nWidth = FXSYS_wtoi(pStr);
+      while (std::iswdigit(*pStr))
+        ++pStr;
+    }
+    if (nWidth < 0 || nWidth > 128 * 1024)
+      return pdfium::Optional<FX_STRSIZE>();
+    int nPrecision = 0;
+    if (*pStr == '.') {
+      pStr++;
+      if (*pStr == '*') {
+        nPrecision = va_arg(argList, int);
+        pStr++;
+      } else {
+        nPrecision = FXSYS_wtoi(pStr);
+        while (std::iswdigit(*pStr))
+          ++pStr;
+      }
+    }
+    if (nPrecision < 0 || nPrecision > 128 * 1024)
+      return pdfium::Optional<FX_STRSIZE>();
+    int nModifier = 0;
+    if (*pStr == L'I' && *(pStr + 1) == L'6' && *(pStr + 2) == L'4') {
+      pStr += 3;
+      nModifier = FORCE_INT64;
+    } else {
+      switch (*pStr) {
+        case 'h':
+          nModifier = FORCE_ANSI;
+          pStr++;
+          break;
+        case 'l':
+          nModifier = FORCE_UNICODE;
+          pStr++;
+          break;
+        case 'F':
+        case 'N':
+        case 'L':
+          pStr++;
+          break;
+      }
+    }
+    switch (*pStr | nModifier) {
+      case 'c':
+      case 'C':
+        nItemLen = 2;
+        va_arg(argList, int);
+        break;
+      case 'c' | FORCE_ANSI:
+      case 'C' | FORCE_ANSI:
+        nItemLen = 2;
+        va_arg(argList, int);
+        break;
+      case 'c' | FORCE_UNICODE:
+      case 'C' | FORCE_UNICODE:
+        nItemLen = 2;
+        va_arg(argList, int);
+        break;
+      case 's': {
+        const wchar_t* pstrNextArg = va_arg(argList, const wchar_t*);
+        if (pstrNextArg) {
+          nItemLen = FXSYS_wcslen(pstrNextArg);
+          if (nItemLen < 1) {
+            nItemLen = 1;
+          }
+        } else {
+          nItemLen = 6;
+        }
+      } break;
+      case 'S': {
+        const char* pstrNextArg = va_arg(argList, const char*);
+        if (pstrNextArg) {
+          nItemLen = FXSYS_strlen(pstrNextArg);
+          if (nItemLen < 1) {
+            nItemLen = 1;
+          }
+        } else {
+          nItemLen = 6;
+        }
+      } break;
+      case 's' | FORCE_ANSI:
+      case 'S' | FORCE_ANSI: {
+        const char* pstrNextArg = va_arg(argList, const char*);
+        if (pstrNextArg) {
+          nItemLen = FXSYS_strlen(pstrNextArg);
+          if (nItemLen < 1) {
+            nItemLen = 1;
+          }
+        } else {
+          nItemLen = 6;
+        }
+      } break;
+      case 's' | FORCE_UNICODE:
+      case 'S' | FORCE_UNICODE: {
+        const wchar_t* pstrNextArg = va_arg(argList, wchar_t*);
+        if (pstrNextArg) {
+          nItemLen = FXSYS_wcslen(pstrNextArg);
+          if (nItemLen < 1) {
+            nItemLen = 1;
+          }
+        } else {
+          nItemLen = 6;
+        }
+      } break;
+    }
+    if (nItemLen != 0) {
+      if (nPrecision != 0 && nItemLen > nPrecision) {
+        nItemLen = nPrecision;
+      }
+      if (nItemLen < nWidth) {
+        nItemLen = nWidth;
+      }
+    } else {
+      switch (*pStr) {
+        case 'd':
+        case 'i':
+        case 'u':
+        case 'x':
+        case 'X':
+        case 'o':
+          if (nModifier & FORCE_INT64) {
+            va_arg(argList, int64_t);
+          } else {
+            va_arg(argList, int);
+          }
+          nItemLen = 32;
+          if (nItemLen < nWidth + nPrecision) {
+            nItemLen = nWidth + nPrecision;
+          }
+          break;
+        case 'a':
+        case 'A':
+        case 'e':
+        case 'E':
+        case 'g':
+        case 'G':
+          va_arg(argList, double);
+          nItemLen = 128;
+          if (nItemLen < nWidth + nPrecision) {
+            nItemLen = nWidth + nPrecision;
+          }
+          break;
+        case 'f':
+          if (nWidth + nPrecision > 100) {
+            nItemLen = nPrecision + nWidth + 128;
+          } else {
+            double f;
+            char pszTemp[256];
+            f = va_arg(argList, double);
+            FXSYS_snprintf(pszTemp, sizeof(pszTemp), "%*.*f", nWidth,
+                           nPrecision + 6, f);
+            nItemLen = FXSYS_strlen(pszTemp);
+          }
+          break;
+        case 'p':
+          va_arg(argList, void*);
+          nItemLen = 32;
+          if (nItemLen < nWidth + nPrecision) {
+            nItemLen = nWidth + nPrecision;
+          }
+          break;
+        case 'n':
+          va_arg(argList, int*);
+          break;
+      }
+    }
+    nMaxLen += nItemLen;
+  }
+  nMaxLen += 32;  // Fudge factor.
+  return pdfium::Optional<FX_STRSIZE>(nMaxLen);
+}
+
+#ifndef NDEBUG
+bool IsValidCodePage(uint16_t codepage) {
+  switch (codepage) {
+    case FX_CODEPAGE_DefANSI:
+    case FX_CODEPAGE_ShiftJIS:
+    case FX_CODEPAGE_ChineseSimplified:
+    case FX_CODEPAGE_Hangul:
+    case FX_CODEPAGE_ChineseTraditional:
+      return true;
+    default:
+      return false;
+  }
+}
+#endif
+
+WideString GetWideString(uint16_t codepage, const ByteStringView& bstr) {
+  ASSERT(IsValidCodePage(codepage));
+
+  int src_len = bstr.GetLength();
+  int dest_len = FXSYS_MultiByteToWideChar(
+      codepage, 0, bstr.unterminated_c_str(), src_len, nullptr, 0);
+  if (!dest_len)
+    return WideString();
+
+  WideString wstr;
+  wchar_t* dest_buf = wstr.GetBuffer(dest_len);
+  FXSYS_MultiByteToWideChar(codepage, 0, bstr.unterminated_c_str(), src_len,
+                            dest_buf, dest_len);
+  wstr.ReleaseBuffer(dest_len);
+  return wstr;
+}
+
+}  // namespace
+
+namespace fxcrt {
+
+static_assert(sizeof(WideString) <= sizeof(wchar_t*),
+              "Strings must not require more space than pointers");
+
+WideString::WideString() {}
+
+WideString::WideString(const WideString& other) : m_pData(other.m_pData) {}
+
+WideString::WideString(WideString&& other) noexcept {
+  m_pData.Swap(other.m_pData);
+}
+
+WideString::WideString(const wchar_t* pStr, FX_STRSIZE nLen) {
+  if (nLen)
+    m_pData.Reset(StringData::Create(pStr, nLen));
+}
+
+WideString::WideString(wchar_t ch) {
+  m_pData.Reset(StringData::Create(1));
+  m_pData->m_String[0] = ch;
+}
+
+WideString::WideString(const wchar_t* ptr)
+    : WideString(ptr, ptr ? FXSYS_wcslen(ptr) : 0) {}
+
+WideString::WideString(const WideStringView& stringSrc) {
+  if (!stringSrc.IsEmpty()) {
+    m_pData.Reset(StringData::Create(stringSrc.unterminated_c_str(),
+                                     stringSrc.GetLength()));
+  }
+}
+
+WideString::WideString(const WideStringView& str1, const WideStringView& str2) {
+  FX_SAFE_STRSIZE nSafeLen = str1.GetLength();
+  nSafeLen += str2.GetLength();
+
+  FX_STRSIZE nNewLen = nSafeLen.ValueOrDie();
+  if (nNewLen == 0)
+    return;
+
+  m_pData.Reset(StringData::Create(nNewLen));
+  m_pData->CopyContents(str1.unterminated_c_str(), str1.GetLength());
+  m_pData->CopyContentsAt(str1.GetLength(), str2.unterminated_c_str(),
+                          str2.GetLength());
+}
+
+WideString::WideString(const std::initializer_list<WideStringView>& list) {
+  FX_SAFE_STRSIZE nSafeLen = 0;
+  for (const auto& item : list)
+    nSafeLen += item.GetLength();
+
+  FX_STRSIZE nNewLen = nSafeLen.ValueOrDie();
+  if (nNewLen == 0)
+    return;
+
+  m_pData.Reset(StringData::Create(nNewLen));
+
+  FX_STRSIZE nOffset = 0;
+  for (const auto& item : list) {
+    m_pData->CopyContentsAt(nOffset, item.unterminated_c_str(),
+                            item.GetLength());
+    nOffset += item.GetLength();
+  }
+}
+
+WideString::~WideString() {}
+
+const WideString& WideString::operator=(const wchar_t* pStr) {
+  if (!pStr || !pStr[0])
+    clear();
+  else
+    AssignCopy(pStr, FXSYS_wcslen(pStr));
+
+  return *this;
+}
+
+const WideString& WideString::operator=(const WideStringView& stringSrc) {
+  if (stringSrc.IsEmpty())
+    clear();
+  else
+    AssignCopy(stringSrc.unterminated_c_str(), stringSrc.GetLength());
+
+  return *this;
+}
+
+const WideString& WideString::operator=(const WideString& stringSrc) {
+  if (m_pData != stringSrc.m_pData)
+    m_pData = stringSrc.m_pData;
+
+  return *this;
+}
+
+const WideString& WideString::operator+=(const wchar_t* pStr) {
+  if (pStr)
+    Concat(pStr, FXSYS_wcslen(pStr));
+
+  return *this;
+}
+
+const WideString& WideString::operator+=(wchar_t ch) {
+  Concat(&ch, 1);
+  return *this;
+}
+
+const WideString& WideString::operator+=(const WideString& str) {
+  if (str.m_pData)
+    Concat(str.m_pData->m_String, str.m_pData->m_nDataLength);
+
+  return *this;
+}
+
+const WideString& WideString::operator+=(const WideStringView& str) {
+  if (!str.IsEmpty())
+    Concat(str.unterminated_c_str(), str.GetLength());
+
+  return *this;
+}
+
+bool WideString::operator==(const wchar_t* ptr) const {
+  if (!m_pData)
+    return !ptr || !ptr[0];
+
+  if (!ptr)
+    return m_pData->m_nDataLength == 0;
+
+  return wcslen(ptr) == m_pData->m_nDataLength &&
+         wmemcmp(ptr, m_pData->m_String, m_pData->m_nDataLength) == 0;
+}
+
+bool WideString::operator==(const WideStringView& str) const {
+  if (!m_pData)
+    return str.IsEmpty();
+
+  return m_pData->m_nDataLength == str.GetLength() &&
+         wmemcmp(m_pData->m_String, str.unterminated_c_str(),
+                 str.GetLength()) == 0;
+}
+
+bool WideString::operator==(const WideString& other) const {
+  if (m_pData == other.m_pData)
+    return true;
+
+  if (IsEmpty())
+    return other.IsEmpty();
+
+  if (other.IsEmpty())
+    return false;
+
+  return other.m_pData->m_nDataLength == m_pData->m_nDataLength &&
+         wmemcmp(other.m_pData->m_String, m_pData->m_String,
+                 m_pData->m_nDataLength) == 0;
+}
+
+bool WideString::operator<(const WideString& str) const {
+  if (m_pData == str.m_pData)
+    return false;
+
+  int result =
+      wmemcmp(c_str(), str.c_str(), std::min(GetLength(), str.GetLength()));
+  return result < 0 || (result == 0 && GetLength() < str.GetLength());
+}
+
+void WideString::AssignCopy(const wchar_t* pSrcData, FX_STRSIZE nSrcLen) {
+  AllocBeforeWrite(nSrcLen);
+  m_pData->CopyContents(pSrcData, nSrcLen);
+  m_pData->m_nDataLength = nSrcLen;
+}
+
+void WideString::ReallocBeforeWrite(FX_STRSIZE nNewLength) {
+  if (m_pData && m_pData->CanOperateInPlace(nNewLength))
+    return;
+
+  if (nNewLength == 0) {
+    clear();
+    return;
+  }
+
+  CFX_RetainPtr<StringData> pNewData(StringData::Create(nNewLength));
+  if (m_pData) {
+    FX_STRSIZE nCopyLength = std::min(m_pData->m_nDataLength, nNewLength);
+    pNewData->CopyContents(m_pData->m_String, nCopyLength);
+    pNewData->m_nDataLength = nCopyLength;
+  } else {
+    pNewData->m_nDataLength = 0;
+  }
+  pNewData->m_String[pNewData->m_nDataLength] = 0;
+  m_pData.Swap(pNewData);
+}
+
+void WideString::AllocBeforeWrite(FX_STRSIZE nNewLength) {
+  if (m_pData && m_pData->CanOperateInPlace(nNewLength))
+    return;
+
+  if (nNewLength == 0) {
+    clear();
+    return;
+  }
+
+  m_pData.Reset(StringData::Create(nNewLength));
+}
+
+void WideString::ReleaseBuffer(FX_STRSIZE nNewLength) {
+  if (!m_pData)
+    return;
+
+  nNewLength = std::min(nNewLength, m_pData->m_nAllocLength);
+  if (nNewLength == 0) {
+    clear();
+    return;
+  }
+
+  ASSERT(m_pData->m_nRefs == 1);
+  m_pData->m_nDataLength = nNewLength;
+  m_pData->m_String[nNewLength] = 0;
+  if (m_pData->m_nAllocLength - nNewLength >= 32) {
+    // Over arbitrary threshold, so pay the price to relocate.  Force copy to
+    // always occur by holding a second reference to the string.
+    WideString preserve(*this);
+    ReallocBeforeWrite(nNewLength);
+  }
+}
+
+void WideString::Reserve(FX_STRSIZE len) {
+  GetBuffer(len);
+}
+
+wchar_t* WideString::GetBuffer(FX_STRSIZE nMinBufLength) {
+  if (!m_pData) {
+    if (nMinBufLength == 0)
+      return nullptr;
+
+    m_pData.Reset(StringData::Create(nMinBufLength));
+    m_pData->m_nDataLength = 0;
+    m_pData->m_String[0] = 0;
+    return m_pData->m_String;
+  }
+
+  if (m_pData->CanOperateInPlace(nMinBufLength))
+    return m_pData->m_String;
+
+  nMinBufLength = std::max(nMinBufLength, m_pData->m_nDataLength);
+  if (nMinBufLength == 0)
+    return nullptr;
+
+  CFX_RetainPtr<StringData> pNewData(StringData::Create(nMinBufLength));
+  pNewData->CopyContents(*m_pData);
+  pNewData->m_nDataLength = m_pData->m_nDataLength;
+  m_pData.Swap(pNewData);
+  return m_pData->m_String;
+}
+
+FX_STRSIZE WideString::Delete(FX_STRSIZE index, FX_STRSIZE count) {
+  if (!m_pData)
+    return 0;
+
+  FX_STRSIZE old_length = m_pData->m_nDataLength;
+  if (count == 0 ||
+      index != pdfium::clamp(index, static_cast<FX_STRSIZE>(0), old_length))
+    return old_length;
+
+  FX_STRSIZE removal_length = index + count;
+  if (removal_length > old_length)
+    return old_length;
+
+  ReallocBeforeWrite(old_length);
+  FX_STRSIZE chars_to_copy = old_length - removal_length + 1;
+  wmemmove(m_pData->m_String + index, m_pData->m_String + removal_length,
+           chars_to_copy);
+  m_pData->m_nDataLength = old_length - count;
+  return m_pData->m_nDataLength;
+}
+
+void WideString::Concat(const wchar_t* pSrcData, FX_STRSIZE nSrcLen) {
+  if (!pSrcData || nSrcLen == 0)
+    return;
+
+  if (!m_pData) {
+    m_pData.Reset(StringData::Create(pSrcData, nSrcLen));
+    return;
+  }
+
+  if (m_pData->CanOperateInPlace(m_pData->m_nDataLength + nSrcLen)) {
+    m_pData->CopyContentsAt(m_pData->m_nDataLength, pSrcData, nSrcLen);
+    m_pData->m_nDataLength += nSrcLen;
+    return;
+  }
+
+  CFX_RetainPtr<StringData> pNewData(
+      StringData::Create(m_pData->m_nDataLength + nSrcLen));
+  pNewData->CopyContents(*m_pData);
+  pNewData->CopyContentsAt(m_pData->m_nDataLength, pSrcData, nSrcLen);
+  m_pData.Swap(pNewData);
+}
+
+ByteString WideString::UTF8Encode() const {
+  return FX_UTF8Encode(AsStringView());
+}
+
+ByteString WideString::UTF16LE_Encode() const {
+  if (!m_pData) {
+    return ByteString("\0\0", 2);
+  }
+  int len = m_pData->m_nDataLength;
+  ByteString result;
+  char* buffer = result.GetBuffer(len * 2 + 2);
+  for (int i = 0; i < len; i++) {
+    buffer[i * 2] = m_pData->m_String[i] & 0xff;
+    buffer[i * 2 + 1] = m_pData->m_String[i] >> 8;
+  }
+  buffer[len * 2] = 0;
+  buffer[len * 2 + 1] = 0;
+  result.ReleaseBuffer(len * 2 + 2);
+  return result;
+}
+
+WideString WideString::Mid(FX_STRSIZE first, FX_STRSIZE count) const {
+  if (!m_pData)
+    return WideString();
+
+  if (!IsValidIndex(first))
+    return WideString();
+
+  if (count == 0 || !IsValidLength(count))
+    return WideString();
+
+  if (!IsValidIndex(first + count - 1))
+    return WideString();
+
+  if (first == 0 && count == GetLength())
+    return *this;
+
+  WideString dest;
+  AllocCopy(dest, count, first);
+  return dest;
+}
+
+WideString WideString::Left(FX_STRSIZE count) const {
+  if (count == 0 || !IsValidLength(count))
+    return WideString();
+  return Mid(0, count);
+}
+
+WideString WideString::Right(FX_STRSIZE count) const {
+  if (count == 0 || !IsValidLength(count))
+    return WideString();
+  return Mid(GetLength() - count, count);
+}
+
+void WideString::AllocCopy(WideString& dest,
+                           FX_STRSIZE nCopyLen,
+                           FX_STRSIZE nCopyIndex) const {
+  if (nCopyLen == 0)
+    return;
+
+  CFX_RetainPtr<StringData> pNewData(
+      StringData::Create(m_pData->m_String + nCopyIndex, nCopyLen));
+  dest.m_pData.Swap(pNewData);
+}
+
+bool WideString::TryVSWPrintf(FX_STRSIZE size,
+                              const wchar_t* pFormat,
+                              va_list argList) {
+  GetBuffer(size);
+  if (!m_pData)
+    return true;
+
+  // In the following two calls, there's always space in the buffer for
+  // a terminating NUL that's not included in nMaxLen.
+  // For vswprintf(), MSAN won't untaint the buffer on a truncated write's
+  // -1 return code even though the buffer is written. Probably just as well
+  // not to trust the vendor's implementation to write anything anyways.
+  // See https://crbug.com/705912.
+  memset(m_pData->m_String, 0, (size + 1) * sizeof(wchar_t));
+  int ret = vswprintf(m_pData->m_String, size + 1, pFormat, argList);
+  bool bSufficientBuffer = ret >= 0 || m_pData->m_String[size - 1] == 0;
+  ReleaseBuffer(GetStringLength());
+  return bSufficientBuffer;
+}
+
+void WideString::FormatV(const wchar_t* format, va_list argList) {
+  va_list argListCopy;
+  va_copy(argListCopy, argList);
+  int maxLen = vswprintf(nullptr, 0, format, argListCopy);
+  va_end(argListCopy);
+  if (maxLen <= 0) {
+    va_copy(argListCopy, argList);
+    auto guess = GuessSizeForVSWPrintf(format, argListCopy);
+    va_end(argListCopy);
+    if (!guess.has_value())
+      return;
+    maxLen = pdfium::base::checked_cast<int>(guess.value());
+  }
+  while (maxLen < 32 * 1024) {
+    va_copy(argListCopy, argList);
+    bool bSufficientBuffer =
+        TryVSWPrintf(static_cast<FX_STRSIZE>(maxLen), format, argListCopy);
+    va_end(argListCopy);
+    if (bSufficientBuffer)
+      break;
+    maxLen *= 2;
+  }
+}
+
+void WideString::Format(const wchar_t* pFormat, ...) {
+  va_list argList;
+  va_start(argList, pFormat);
+  FormatV(pFormat, argList);
+  va_end(argList);
+}
+
+FX_STRSIZE WideString::Insert(FX_STRSIZE location, wchar_t ch) {
+  const FX_STRSIZE cur_length = m_pData ? m_pData->m_nDataLength : 0;
+  if (!IsValidLength(location))
+    return cur_length;
+
+  const FX_STRSIZE new_length = cur_length + 1;
+  ReallocBeforeWrite(new_length);
+  wmemmove(m_pData->m_String + location + 1, m_pData->m_String + location,
+           new_length - location);
+  m_pData->m_String[location] = ch;
+  m_pData->m_nDataLength = new_length;
+  return new_length;
+}
+
+pdfium::Optional<FX_STRSIZE> WideString::Find(wchar_t ch,
+                                              FX_STRSIZE start) const {
+  if (!m_pData)
+    return pdfium::Optional<FX_STRSIZE>();
+
+  if (!IsValidIndex(start))
+    return pdfium::Optional<FX_STRSIZE>();
+
+  const wchar_t* pStr =
+      wmemchr(m_pData->m_String + start, ch, m_pData->m_nDataLength - start);
+  return pStr ? pdfium::Optional<FX_STRSIZE>(
+                    static_cast<FX_STRSIZE>(pStr - m_pData->m_String))
+              : pdfium::Optional<FX_STRSIZE>();
+}
+
+pdfium::Optional<FX_STRSIZE> WideString::Find(const WideStringView& subStr,
+                                              FX_STRSIZE start) const {
+  if (!m_pData)
+    return pdfium::Optional<FX_STRSIZE>();
+
+  if (!IsValidIndex(start))
+    return pdfium::Optional<FX_STRSIZE>();
+
+  const wchar_t* pStr =
+      FX_wcsstr(m_pData->m_String + start, m_pData->m_nDataLength - start,
+                subStr.unterminated_c_str(), subStr.GetLength());
+  return pStr ? pdfium::Optional<FX_STRSIZE>(
+                    static_cast<FX_STRSIZE>(pStr - m_pData->m_String))
+              : pdfium::Optional<FX_STRSIZE>();
+}
+
+void WideString::MakeLower() {
+  if (!m_pData)
+    return;
+
+  ReallocBeforeWrite(m_pData->m_nDataLength);
+  FXSYS_wcslwr(m_pData->m_String);
+}
+
+void WideString::MakeUpper() {
+  if (!m_pData)
+    return;
+
+  ReallocBeforeWrite(m_pData->m_nDataLength);
+  FXSYS_wcsupr(m_pData->m_String);
+}
+
+FX_STRSIZE WideString::Remove(wchar_t chRemove) {
+  if (!m_pData || m_pData->m_nDataLength < 1)
+    return 0;
+
+  wchar_t* pstrSource = m_pData->m_String;
+  wchar_t* pstrEnd = m_pData->m_String + m_pData->m_nDataLength;
+  while (pstrSource < pstrEnd) {
+    if (*pstrSource == chRemove)
+      break;
+    pstrSource++;
+  }
+  if (pstrSource == pstrEnd)
+    return 0;
+
+  ptrdiff_t copied = pstrSource - m_pData->m_String;
+  ReallocBeforeWrite(m_pData->m_nDataLength);
+  pstrSource = m_pData->m_String + copied;
+  pstrEnd = m_pData->m_String + m_pData->m_nDataLength;
+
+  wchar_t* pstrDest = pstrSource;
+  while (pstrSource < pstrEnd) {
+    if (*pstrSource != chRemove) {
+      *pstrDest = *pstrSource;
+      pstrDest++;
+    }
+    pstrSource++;
+  }
+
+  *pstrDest = 0;
+  FX_STRSIZE count = static_cast<FX_STRSIZE>(pstrSource - pstrDest);
+  m_pData->m_nDataLength -= count;
+  return count;
+}
+
+FX_STRSIZE WideString::Replace(const WideStringView& pOld,
+                               const WideStringView& pNew) {
+  if (!m_pData || pOld.IsEmpty())
+    return 0;
+
+  FX_STRSIZE nSourceLen = pOld.GetLength();
+  FX_STRSIZE nReplacementLen = pNew.GetLength();
+  FX_STRSIZE count = 0;
+  const wchar_t* pStart = m_pData->m_String;
+  wchar_t* pEnd = m_pData->m_String + m_pData->m_nDataLength;
+  while (1) {
+    const wchar_t* pTarget = FX_wcsstr(pStart, (FX_STRSIZE)(pEnd - pStart),
+                                       pOld.unterminated_c_str(), nSourceLen);
+    if (!pTarget)
+      break;
+
+    count++;
+    pStart = pTarget + nSourceLen;
+  }
+  if (count == 0)
+    return 0;
+
+  FX_STRSIZE nNewLength =
+      m_pData->m_nDataLength + (nReplacementLen - nSourceLen) * count;
+
+  if (nNewLength == 0) {
+    clear();
+    return count;
+  }
+
+  CFX_RetainPtr<StringData> pNewData(StringData::Create(nNewLength));
+  pStart = m_pData->m_String;
+  wchar_t* pDest = pNewData->m_String;
+  for (FX_STRSIZE i = 0; i < count; i++) {
+    const wchar_t* pTarget = FX_wcsstr(pStart, (FX_STRSIZE)(pEnd - pStart),
+                                       pOld.unterminated_c_str(), nSourceLen);
+    wmemcpy(pDest, pStart, pTarget - pStart);
+    pDest += pTarget - pStart;
+    wmemcpy(pDest, pNew.unterminated_c_str(), pNew.GetLength());
+    pDest += pNew.GetLength();
+    pStart = pTarget + nSourceLen;
+  }
+  wmemcpy(pDest, pStart, pEnd - pStart);
+  m_pData.Swap(pNewData);
+  return count;
+}
+
+// static
+WideString WideString::FromLocal(const ByteStringView& str) {
+  return FromCodePage(str, 0);
+}
+
+// static
+WideString WideString::FromCodePage(const ByteStringView& str,
+                                    uint16_t codepage) {
+  return GetWideString(codepage, str);
+}
+
+// static
+WideString WideString::FromUTF8(const ByteStringView& str) {
+  if (str.IsEmpty())
+    return WideString();
+
+  CFX_UTF8Decoder decoder;
+  for (FX_STRSIZE i = 0; i < str.GetLength(); i++)
+    decoder.Input(str[i]);
+
+  return WideString(decoder.GetResult());
+}
+
+// static
+WideString WideString::FromUTF16LE(const unsigned short* wstr,
+                                   FX_STRSIZE wlen) {
+  if (!wstr || wlen == 0) {
+    return WideString();
+  }
+
+  WideString result;
+  wchar_t* buf = result.GetBuffer(wlen);
+  for (FX_STRSIZE i = 0; i < wlen; i++) {
+    buf[i] = wstr[i];
+  }
+  result.ReleaseBuffer(wlen);
+  return result;
+}
+
+void WideString::SetAt(FX_STRSIZE index, wchar_t c) {
+  ASSERT(IsValidIndex(index));
+  ReallocBeforeWrite(m_pData->m_nDataLength);
+  m_pData->m_String[index] = c;
+}
+
+int WideString::Compare(const wchar_t* lpsz) const {
+  if (m_pData)
+    return wcscmp(m_pData->m_String, lpsz);
+  return (!lpsz || lpsz[0] == 0) ? 0 : -1;
+}
+
+int WideString::Compare(const WideString& str) const {
+  if (!m_pData) {
+    if (!str.m_pData) {
+      return 0;
+    }
+    return -1;
+  }
+  if (!str.m_pData) {
+    return 1;
+  }
+  FX_STRSIZE this_len = m_pData->m_nDataLength;
+  FX_STRSIZE that_len = str.m_pData->m_nDataLength;
+  FX_STRSIZE min_len = std::min(this_len, that_len);
+  for (FX_STRSIZE i = 0; i < min_len; i++) {
+    if (m_pData->m_String[i] < str.m_pData->m_String[i]) {
+      return -1;
+    }
+    if (m_pData->m_String[i] > str.m_pData->m_String[i]) {
+      return 1;
+    }
+  }
+  if (this_len < that_len) {
+    return -1;
+  }
+  if (this_len > that_len) {
+    return 1;
+  }
+  return 0;
+}
+
+int WideString::CompareNoCase(const wchar_t* lpsz) const {
+  if (!m_pData) {
+    return (!lpsz || lpsz[0] == 0) ? 0 : -1;
+  }
+  return FXSYS_wcsicmp(m_pData->m_String, lpsz);
+}
+
+FX_STRSIZE WideString::WStringLength(const unsigned short* str) {
+  FX_STRSIZE len = 0;
+  if (str)
+    while (str[len])
+      len++;
+  return len;
+}
+
+void WideString::TrimRight(const WideStringView& pTargets) {
+  if (IsEmpty() || pTargets.IsEmpty())
+    return;
+
+  FX_STRSIZE pos = GetLength();
+  while (pos && pTargets.Contains(m_pData->m_String[pos - 1]))
+    pos--;
+
+  if (pos < m_pData->m_nDataLength) {
+    ReallocBeforeWrite(m_pData->m_nDataLength);
+    m_pData->m_String[pos] = 0;
+    m_pData->m_nDataLength = pos;
+  }
+}
+
+void WideString::TrimRight(wchar_t chTarget) {
+  wchar_t str[2] = {chTarget, 0};
+  TrimRight(str);
+}
+
+void WideString::TrimRight() {
+  TrimRight(L"\x09\x0a\x0b\x0c\x0d\x20");
+}
+
+void WideString::TrimLeft(const WideStringView& pTargets) {
+  if (!m_pData || pTargets.IsEmpty())
+    return;
+
+  FX_STRSIZE len = GetLength();
+  if (len == 0)
+    return;
+
+  FX_STRSIZE pos = 0;
+  while (pos < len) {
+    FX_STRSIZE i = 0;
+    while (i < pTargets.GetLength() &&
+           pTargets.CharAt(i) != m_pData->m_String[pos]) {
+      i++;
+    }
+    if (i == pTargets.GetLength()) {
+      break;
+    }
+    pos++;
+  }
+  if (!pos)
+    return;
+
+  ReallocBeforeWrite(len);
+  FX_STRSIZE nDataLength = len - pos;
+  memmove(m_pData->m_String, m_pData->m_String + pos,
+          (nDataLength + 1) * sizeof(wchar_t));
+  m_pData->m_nDataLength = nDataLength;
+}
+
+void WideString::TrimLeft(wchar_t chTarget) {
+  wchar_t str[2] = {chTarget, 0};
+  TrimLeft(str);
+}
+
+void WideString::TrimLeft() {
+  TrimLeft(L"\x09\x0a\x0b\x0c\x0d\x20");
+}
+float FX_wtof(const wchar_t* str, int len) {
+  if (len == 0) {
+    return 0.0;
+  }
+  int cc = 0;
+  bool bNegative = false;
+  if (str[0] == '+') {
+    cc++;
+  } else if (str[0] == '-') {
+    bNegative = true;
+    cc++;
+  }
+  int integer = 0;
+  while (cc < len) {
+    if (str[cc] == '.') {
+      break;
+    }
+    integer = integer * 10 + FXSYS_DecimalCharToInt(str[cc]);
+    cc++;
+  }
+  float fraction = 0;
+  if (str[cc] == '.') {
+    cc++;
+    float scale = 0.1f;
+    while (cc < len) {
+      fraction += scale * FXSYS_DecimalCharToInt(str[cc]);
+      scale *= 0.1f;
+      cc++;
+    }
+  }
+  fraction += static_cast<float>(integer);
+  return bNegative ? -fraction : fraction;
+}
+
+int WideString::GetInteger() const {
+  return m_pData ? FXSYS_wtoi(m_pData->m_String) : 0;
+}
+
+float WideString::GetFloat() const {
+  return m_pData ? FX_wtof(m_pData->m_String, m_pData->m_nDataLength) : 0.0f;
+}
+
+std::wostream& operator<<(std::wostream& os, const WideString& str) {
+  return os.write(str.c_str(), str.GetLength());
+}
+
+std::ostream& operator<<(std::ostream& os, const WideString& str) {
+  os << str.UTF8Encode();
+  return os;
+}
+
+std::wostream& operator<<(std::wostream& os, const WideStringView& str) {
+  return os.write(str.unterminated_c_str(), str.GetLength());
+}
+
+std::ostream& operator<<(std::ostream& os, const WideStringView& str) {
+  os << FX_UTF8Encode(str);
+  return os;
+}
+
+}  // namespace fxcrt