fix a few linux compilation warnings

core/src/fxge/ge/fx_ge_fontmap.cpp

 // 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 "../../../include/fxge/fx_ge.h"
 #include "../../../include/fxge/fx_freetype.h"
 #include "text_int.h"
 #define GET_TT_SHORT(w)  (FX_WORD)(((w)[0] << 8) | (w)[1])
@@ skipping 730 matching lines @@
         return 1 << 20;
     }
     if (charset == FXFONT_HANGEUL_CHARSET) {
         return 1 << 19;
     }
     if (charset == FXFONT_SYMBOL_CHARSET) {
         return 1 << 31;
     }
     return 1 << 21;
 }
-static int CP2CharSet(int cp)
-{
-    if(cp == 932) {
-        return FXFONT_SHIFTJIS_CHARSET;
-    } else if(cp == 936) {
-        return FXFONT_GB2312_CHARSET;
-    } else if(cp == 949) {
-        return FXFONT_HANGEUL_CHARSET;
-    } else if(cp == 950) {
-        return FXFONT_CHINESEBIG5_CHARSET;
-    }
-    return FXFONT_DEFAULT_CHARSET;
-}
 FXFT_Face CFX_FontMapper::UseInternalSubst(CFX_SubstFont* pSubstFont, int iBaseFont, int italic_angle, int weight, int picthfamily)
 {
     if (iBaseFont < 12) {
         if (m_FoxitFaces[iBaseFont]) {
             return m_FoxitFaces[iBaseFont];
         }
         FX_LPCBYTE pFontData = NULL;
         FX_DWORD size = 0;
         if (m_pFontMgr->GetStandardFont(pFontData, size, iBaseFont)) {
             m_FoxitFaces[iBaseFont] = m_pFontMgr->GetFixedFace(pFontData, size, 0);
@@ skipping 607 matching lines @@
 void CFX_FolderFontInfo::ScanFile(CFX_ByteString& path)
 {
     FXSYS_FILE* pFile = FXSYS_fopen(path, "rb");
     if (pFile == NULL) {
         return;
     }
     FXSYS_fseek(pFile, 0, FXSYS_SEEK_END);
     FX_DWORD filesize = FXSYS_ftell(pFile);
     FX_BYTE buffer[16];
     FXSYS_fseek(pFile, 0, FXSYS_SEEK_SET);
     size_t readCnt = FXSYS_fread(buffer, 12, 1, pFile);

[jun_fang, 2015/01/17 00:39:17]

suggest to check whether readCnt equals to 12.

+    // TODO(tsepez): File bug, reading from a file less than 12 bytes gives UMR.
     if (GET_TT_LONG(buffer) == 0x74746366) {
         FX_DWORD nFaces = GET_TT_LONG(buffer + 8);
         FX_LPBYTE offsets = FX_Alloc(FX_BYTE, nFaces * 4);
         if (!offsets) {
             FXSYS_fclose(pFile);
             return;
         }
         readCnt = FXSYS_fread(offsets, nFaces * 4, 1, pFile);
         for (FX_DWORD i = 0; i < nFaces; i ++) {
             FX_LPBYTE p = offsets + i * 4;
@@ skipping 137 matching lines @@
         return FALSE;
     }
     CFontFaceInfo* pFont = (CFontFaceInfo*)hFont;
     name = pFont->m_FaceName;
     return TRUE;
 }
 FX_BOOL CFX_FolderFontInfo::GetFontCharset(void* hFont, int& charset)
 {
     return FALSE;
 }