Codepage code into anonymouse namespace

This CL moves the FX_GetCodePageFromCharset method into cfgas_fontmgr
anonymouse namespace.

Change-Id: I1232341b8639328035f12aebfb7a65a4fc0ba08f
Reviewed-on: https://pdfium-review.googlesource.com/4291
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

1 files changed, 60 insertions, 3 deletions

diff --git a/xfa/fgas/font/cfgas_fontmgr.cpp b/xfa/fgas/font/cfgas_fontmgr.cpp
index 766422e381..8cd799e37a 100644
--- a/xfa/fgas/font/cfgas_fontmgr.cpp
+++ b/xfa/fgas/font/cfgas_fontmgr.cpp
@@ -25,6 +25,63 @@
 
 namespace {
 
+struct FX_CHARSET_MAP {
+  uint16_t charset;
+  uint16_t codepage;
+};
+
+const FX_CHARSET_MAP g_FXCharset2CodePageTable[] = {
+    {FX_CHARSET_ANSI, FX_CODEPAGE_MSWin_WesternEuropean},
+    {FX_CHARSET_Default, FX_CODEPAGE_DefANSI},
+    {FX_CHARSET_Symbol, FX_CODEPAGE_Symbol},
+    {FX_CHARSET_MAC_Roman, FX_CODEPAGE_MAC_Roman},
+    {FX_CHARSET_MAC_ShiftJIS, FX_CODEPAGE_MAC_ShiftJIS},
+    {FX_CHARSET_MAC_Korean, FX_CODEPAGE_MAC_Korean},
+    {FX_CHARSET_MAC_ChineseSimplified, FX_CODEPAGE_MAC_ChineseSimplified},
+    {FX_CHARSET_MAC_ChineseTriditional, FX_CODEPAGE_MAC_ChineseTraditional},
+    {FX_CHARSET_MAC_Hebrew, FX_CODEPAGE_MAC_Hebrew},
+    {FX_CHARSET_MAC_Arabic, FX_CODEPAGE_MAC_Arabic},
+    {FX_CHARSET_MAC_Greek, FX_CODEPAGE_MAC_Greek},
+    {FX_CHARSET_MAC_Turkish, FX_CODEPAGE_MAC_Turkish},
+    {FX_CHARSET_MAC_Thai, FX_CODEPAGE_MAC_Thai},
+    {FX_CHARSET_MAC_EasternEuropean, FX_CODEPAGE_MAC_EasternEuropean},
+    {FX_CHARSET_MAC_Cyrillic, FX_CODEPAGE_MAC_Cyrillic},
+    {FX_CHARSET_ShiftJIS, FX_CODEPAGE_ShiftJIS},
+    {FX_CHARSET_Korean, FX_CODEPAGE_Korean},
+    {FX_CHARSET_Johab, FX_CODEPAGE_Johab},
+    {FX_CHARSET_ChineseSimplified, FX_CODEPAGE_ChineseSimplified},
+    {FX_CHARSET_ChineseTriditional, FX_CODEPAGE_ChineseTraditional},
+    {FX_CHARSET_MSWin_Greek, FX_CODEPAGE_MSWin_Greek},
+    {FX_CHARSET_MSWin_Turkish, FX_CODEPAGE_MSWin_Turkish},
+    {FX_CHARSET_MSWin_Vietnamese, FX_CODEPAGE_MSWin_Vietnamese},
+    {FX_CHARSET_MSWin_Hebrew, FX_CODEPAGE_MSWin_Hebrew},
+    {FX_CHARSET_MSWin_Arabic, FX_CODEPAGE_MSWin_Arabic},
+    {FX_CHARSET_MSWin_Baltic, FX_CODEPAGE_MSWin_Baltic},
+    {FX_CHARSET_MSWin_Cyrillic, FX_CODEPAGE_MSWin_Cyrillic},
+    {FX_CHARSET_Thai, FX_CODEPAGE_MSDOS_Thai},
+    {FX_CHARSET_MSWin_EasterEuropean, FX_CODEPAGE_MSWin_EasternEuropean},
+    {FX_CHARSET_US, FX_CODEPAGE_MSDOS_US},
+    {FX_CHARSET_OEM, FX_CODEPAGE_MSDOS_WesternEuropean},
+};
+
+uint16_t GetCodePageFromCharset(uint8_t charset) {
+  int32_t iEnd = sizeof(g_FXCharset2CodePageTable) / sizeof(FX_CHARSET_MAP) - 1;
+  ASSERT(iEnd >= 0);
+
+  int32_t iStart = 0, iMid;
+  do {
+    iMid = (iStart + iEnd) / 2;
+    const FX_CHARSET_MAP& cp = g_FXCharset2CodePageTable[iMid];
+    if (charset == cp.charset)
+      return cp.codepage;
+    if (charset < cp.charset)
+      iEnd = iMid - 1;
+    else
+      iStart = iMid + 1;
+  } while (iStart <= iEnd);
+  return 0xFFFF;
+}
+
 int32_t GetSimilarityScore(FX_FONTDESCRIPTOR const* pFont,
                            uint32_t dwFontStyles) {
   int32_t iValue = 0;
@@ -67,7 +124,7 @@ const FX_FONTDESCRIPTOR* MatchDefaultFont(
     if (font.uCharSet == FX_CHARSET_Symbol)
       continue;
     if (pParams->wCodePage != 0xFFFF) {
-      if (FX_GetCodePageFromCharset(font.uCharSet) != pParams->wCodePage)
+      if (GetCodePageFromCharset(font.uCharSet) != pParams->wCodePage)
         continue;
     } else {
       if (pParams->dwUSB < 128) {
@@ -195,7 +252,7 @@ CFX_RetainPtr<CFGAS_GEFont> CFGAS_FontMgr::GetFontByUnicode(
   if (!pFD)
     return nullptr;
 
-  uint16_t wCodePage = FX_GetCodePageFromCharset(pFD->uCharSet);
+  uint16_t wCodePage = GetCodePageFromCharset(pFD->uCharSet);
   const wchar_t* pFontFace = pFD->wsFontFace;
   CFX_RetainPtr<CFGAS_GEFont> pFont =
       CFGAS_GEFont::LoadFont(pFontFace, dwFontStyles, wCodePage, this);
@@ -227,7 +284,7 @@ CFX_RetainPtr<CFGAS_GEFont> CFGAS_FontMgr::LoadFont(
     return nullptr;
 
   if (wCodePage == 0xFFFF)
-    wCodePage = FX_GetCodePageFromCharset(pFD->uCharSet);
+    wCodePage = GetCodePageFromCharset(pFD->uCharSet);
 
   pFont =
       CFGAS_GEFont::LoadFont(pFD->wsFontFace, dwFontStyles, wCodePage, this);