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      1 // Copyright 2014 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #ifndef CORE_FXCRT_FX_EXT_H_
      8 #define CORE_FXCRT_FX_EXT_H_
      9 
     10 #include <cctype>
     11 #include <cwctype>
     12 #include <memory>
     13 
     14 #include "core/fxcrt/fx_basic.h"
     15 
     16 #define FX_INVALID_OFFSET static_cast<uint32_t>(-1)
     17 
     18 FX_FLOAT FXSYS_tan(FX_FLOAT a);
     19 FX_FLOAT FXSYS_logb(FX_FLOAT b, FX_FLOAT x);
     20 FX_FLOAT FXSYS_strtof(const FX_CHAR* pcsStr,
     21                       int32_t iLength = -1,
     22                       int32_t* pUsedLen = nullptr);
     23 FX_FLOAT FXSYS_wcstof(const FX_WCHAR* pwsStr,
     24                       int32_t iLength = -1,
     25                       int32_t* pUsedLen = nullptr);
     26 FX_WCHAR* FXSYS_wcsncpy(FX_WCHAR* dstStr, const FX_WCHAR* srcStr, size_t count);
     27 int32_t FXSYS_wcsnicmp(const FX_WCHAR* s1, const FX_WCHAR* s2, size_t count);
     28 int32_t FXSYS_strnicmp(const FX_CHAR* s1, const FX_CHAR* s2, size_t count);
     29 
     30 inline bool FXSYS_islower(int32_t ch) {
     31   return ch >= 'a' && ch <= 'z';
     32 }
     33 inline bool FXSYS_isupper(int32_t ch) {
     34   return ch >= 'A' && ch <= 'Z';
     35 }
     36 inline int32_t FXSYS_tolower(int32_t ch) {
     37   return ch < 'A' || ch > 'Z' ? ch : (ch + 0x20);
     38 }
     39 inline int32_t FXSYS_toupper(int32_t ch) {
     40   return ch < 'a' || ch > 'z' ? ch : (ch - 0x20);
     41 }
     42 inline bool FXSYS_iswalpha(wchar_t wch) {
     43   return (wch >= L'A' && wch <= L'Z') || (wch >= L'a' && wch <= L'z');
     44 }
     45 inline bool FXSYS_iswdigit(wchar_t wch) {
     46   return wch >= L'0' && wch <= L'9';
     47 }
     48 inline bool FXSYS_iswalnum(wchar_t wch) {
     49   return FXSYS_iswalpha(wch) || FXSYS_iswdigit(wch);
     50 }
     51 inline bool FXSYS_iswspace(FX_WCHAR c) {
     52   return (c == 0x20) || (c == 0x0d) || (c == 0x0a) || (c == 0x09);
     53 }
     54 
     55 inline int FXSYS_toHexDigit(const FX_CHAR c) {
     56   if (!std::isxdigit(c))
     57     return 0;
     58   char upchar = std::toupper(c);
     59   return upchar > '9' ? upchar - 'A' + 10 : upchar - '0';
     60 }
     61 
     62 inline bool FXSYS_isDecimalDigit(const FX_CHAR c) {
     63   return !!std::isdigit(c);
     64 }
     65 
     66 inline bool FXSYS_isDecimalDigit(const FX_WCHAR c) {
     67   return !!std::iswdigit(c);
     68 }
     69 
     70 inline int FXSYS_toDecimalDigit(const FX_CHAR c) {
     71   return std::isdigit(c) ? c - '0' : 0;
     72 }
     73 
     74 inline int FXSYS_toDecimalDigit(const FX_WCHAR c) {
     75   return std::iswdigit(c) ? c - L'0' : 0;
     76 }
     77 
     78 FX_FLOAT FXSYS_FractionalScale(size_t scale_factor, int value);
     79 int FXSYS_FractionalScaleCount();
     80 
     81 void* FX_Random_MT_Start(uint32_t dwSeed);
     82 void FX_Random_MT_Close(void* pContext);
     83 uint32_t FX_Random_MT_Generate(void* pContext);
     84 void FX_Random_GenerateBase(uint32_t* pBuffer, int32_t iCount);
     85 void FX_Random_GenerateMT(uint32_t* pBuffer, int32_t iCount);
     86 void FX_Random_GenerateCrypto(uint32_t* pBuffer, int32_t iCount);
     87 
     88 #ifdef PDF_ENABLE_XFA
     89 struct FX_GUID {
     90   uint32_t data1;
     91   uint16_t data2;
     92   uint16_t data3;
     93   uint8_t data4[8];
     94 };
     95 void FX_GUID_CreateV4(FX_GUID* pGUID);
     96 void FX_GUID_ToString(const FX_GUID* pGUID,
     97                       CFX_ByteString& bsStr,
     98                       bool bSeparator = true);
     99 #endif  // PDF_ENABLE_XFA
    100 
    101 #endif  // CORE_FXCRT_FX_EXT_H_
    102