core/fxcrt/fx_extension.cpp - pdfium - Git at Google

 // 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/extension.h"
 #include "core/fxcrt/include/fx_basic.h"
 #include "core/fxcrt/include/fx_ext.h"

 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
 #include <wincrypt.h>
 #else
 #include <ctime>
 #endif

 CFX_CRTFileStream::CFX_CRTFileStream(IFXCRT_FileAccess* pFA)
     : m_pFile(pFA), m_dwCount(1) {}

 CFX_CRTFileStream::~CFX_CRTFileStream() {
   if (m_pFile) {
     m_pFile->Release();
   }
 }

 IFX_FileStream* CFX_CRTFileStream::Retain() {
   m_dwCount++;
   return this;
 }

 void CFX_CRTFileStream::Release() {
   uint32_t nCount = --m_dwCount;
   if (!nCount) {
     delete this;
   }
 }

 FX_FILESIZE CFX_CRTFileStream::GetSize() {
   return m_pFile->GetSize();
 }

 FX_BOOL CFX_CRTFileStream::IsEOF() {
   return GetPosition() >= GetSize();
 }

 FX_FILESIZE CFX_CRTFileStream::GetPosition() {
   return m_pFile->GetPosition();
 }

 FX_BOOL CFX_CRTFileStream::ReadBlock(void* buffer,
                                      FX_FILESIZE offset,
                                      size_t size) {
   return (FX_BOOL)m_pFile->ReadPos(buffer, size, offset);
 }

 size_t CFX_CRTFileStream::ReadBlock(void* buffer, size_t size) {
   return m_pFile->Read(buffer, size);
 }

 FX_BOOL CFX_CRTFileStream::WriteBlock(const void* buffer,
                                       FX_FILESIZE offset,
                                       size_t size) {
   return (FX_BOOL)m_pFile->WritePos(buffer, size, offset);
 }

 FX_BOOL CFX_CRTFileStream::Flush() {
   return m_pFile->Flush();
 }

 #ifdef PDF_ENABLE_XFA
 IFX_FileAccess* FX_CreateDefaultFileAccess(const CFX_WideStringC& wsPath) {
   if (wsPath.GetLength() == 0)
     return NULL;

   CFX_CRTFileAccess* pFA = NULL;
   pFA = new CFX_CRTFileAccess;
   if (NULL == pFA)
     return NULL;

   pFA->Init(wsPath);
   return pFA;
 }
 #endif  // PDF_ENABLE_XFA

 IFX_FileStream* FX_CreateFileStream(const FX_CHAR* filename, uint32_t dwModes) {
   IFXCRT_FileAccess* pFA = FXCRT_FileAccess_Create();
   if (!pFA) {
     return NULL;
   }
   if (!pFA->Open(filename, dwModes)) {
     pFA->Release();
     return NULL;
   }
   return new CFX_CRTFileStream(pFA);
 }
 IFX_FileStream* FX_CreateFileStream(const FX_WCHAR* filename,
                                     uint32_t dwModes) {
   IFXCRT_FileAccess* pFA = FXCRT_FileAccess_Create();
   if (!pFA) {
     return NULL;
   }
   if (!pFA->Open(filename, dwModes)) {
     pFA->Release();
     return NULL;
   }
   return new CFX_CRTFileStream(pFA);
 }
 IFX_FileRead* FX_CreateFileRead(const FX_CHAR* filename) {
   return FX_CreateFileStream(filename, FX_FILEMODE_ReadOnly);
 }
 IFX_FileRead* FX_CreateFileRead(const FX_WCHAR* filename) {
   return FX_CreateFileStream(filename, FX_FILEMODE_ReadOnly);
 }
 IFX_MemoryStream* FX_CreateMemoryStream(uint8_t* pBuffer,
                                         size_t dwSize,
                                         FX_BOOL bTakeOver) {
   return new CFX_MemoryStream(pBuffer, dwSize, bTakeOver);
 }
 IFX_MemoryStream* FX_CreateMemoryStream(FX_BOOL bConsecutive) {
   return new CFX_MemoryStream(bConsecutive);
 }

 FX_FLOAT FXSYS_tan(FX_FLOAT a) {
   return (FX_FLOAT)tan(a);
 }
 FX_FLOAT FXSYS_logb(FX_FLOAT b, FX_FLOAT x) {
   return FXSYS_log(x) / FXSYS_log(b);
 }
 FX_FLOAT FXSYS_strtof(const FX_CHAR* pcsStr,
                       int32_t iLength,
                       int32_t* pUsedLen) {
   FXSYS_assert(pcsStr);
   if (iLength < 0) {
     iLength = (int32_t)FXSYS_strlen(pcsStr);
   }
   CFX_WideString ws =
       CFX_WideString::FromLocal(CFX_ByteString(pcsStr, iLength));
   return FXSYS_wcstof(ws.c_str(), iLength, pUsedLen);
 }
 FX_FLOAT FXSYS_wcstof(const FX_WCHAR* pwsStr,
                       int32_t iLength,
                       int32_t* pUsedLen) {
   FXSYS_assert(pwsStr);
   if (iLength < 0) {
     iLength = (int32_t)FXSYS_wcslen(pwsStr);
   }
   if (iLength == 0) {
     return 0.0f;
   }
   int32_t iUsedLen = 0;
   FX_BOOL bNegtive = FALSE;
   switch (pwsStr[iUsedLen]) {
     case '-':
       bNegtive = TRUE;
     case '+':
       iUsedLen++;
       break;
   }
   FX_FLOAT fValue = 0.0f;
   while (iUsedLen < iLength) {
     FX_WCHAR wch = pwsStr[iUsedLen];
     if (wch >= L'0' && wch <= L'9') {
       fValue = fValue * 10.0f + (wch - L'0');
     } else {
       break;
     }
     iUsedLen++;
   }
   if (iUsedLen < iLength && pwsStr[iUsedLen] == L'.') {
     FX_FLOAT fPrecise = 0.1f;
     while (++iUsedLen < iLength) {
       FX_WCHAR wch = pwsStr[iUsedLen];
       if (wch >= L'0' && wch <= L'9') {
         fValue += (wch - L'0') * fPrecise;
         fPrecise *= 0.1f;
       } else {
         break;
       }
     }
   }
   if (pUsedLen) {
     *pUsedLen = iUsedLen;
   }
   return bNegtive ? -fValue : fValue;
 }
 FX_WCHAR* FXSYS_wcsncpy(FX_WCHAR* dstStr,
                         const FX_WCHAR* srcStr,
                         size_t count) {
   FXSYS_assert(dstStr && srcStr && count > 0);
   for (size_t i = 0; i < count; ++i)
     if ((dstStr[i] = srcStr[i]) == L'\0') {
       break;
     }
   return dstStr;
 }
 int32_t FXSYS_wcsnicmp(const FX_WCHAR* s1, const FX_WCHAR* s2, size_t count) {
   FXSYS_assert(s1 && s2 && count > 0);
   FX_WCHAR wch1 = 0, wch2 = 0;
   while (count-- > 0) {
     wch1 = (FX_WCHAR)FXSYS_tolower(*s1++);
     wch2 = (FX_WCHAR)FXSYS_tolower(*s2++);
     if (wch1 != wch2) {
       break;
     }
   }
   return wch1 - wch2;
 }
 int32_t FXSYS_strnicmp(const FX_CHAR* s1, const FX_CHAR* s2, size_t count) {
   FXSYS_assert(s1 && s2 && count > 0);
   FX_CHAR ch1 = 0, ch2 = 0;
   while (count-- > 0) {
     ch1 = (FX_CHAR)FXSYS_tolower(*s1++);
     ch2 = (FX_CHAR)FXSYS_tolower(*s2++);
     if (ch1 != ch2) {
       break;
     }
   }
   return ch1 - ch2;
 }
 uint32_t FX_HashCode_String_GetA(const FX_CHAR* pStr,
                                  int32_t iLength,
                                  FX_BOOL bIgnoreCase) {
   FXSYS_assert(pStr);
   if (iLength < 0) {
     iLength = (int32_t)FXSYS_strlen(pStr);
   }
   const FX_CHAR* pStrEnd = pStr + iLength;
   uint32_t dwHashCode = 0;
   if (bIgnoreCase) {
     while (pStr < pStrEnd) {
       dwHashCode = 31 * dwHashCode + FXSYS_tolower(*pStr++);
     }
   } else {
     while (pStr < pStrEnd) {
       dwHashCode = 31 * dwHashCode + *pStr++;
     }
   }
   return dwHashCode;
 }
 uint32_t FX_HashCode_String_GetW(const FX_WCHAR* pStr,
                                  int32_t iLength,
                                  FX_BOOL bIgnoreCase) {
   FXSYS_assert(pStr);
   if (iLength < 0) {
     iLength = (int32_t)FXSYS_wcslen(pStr);
   }
   const FX_WCHAR* pStrEnd = pStr + iLength;
   uint32_t dwHashCode = 0;
   if (bIgnoreCase) {
     while (pStr < pStrEnd) {
       dwHashCode = 1313 * dwHashCode + FXSYS_tolower(*pStr++);
     }
   } else {
     while (pStr < pStrEnd) {
       dwHashCode = 1313 * dwHashCode + *pStr++;
     }
   }
   return dwHashCode;
 }

 void* FX_Random_MT_Start(uint32_t dwSeed) {
   FX_MTRANDOMCONTEXT* pContext = FX_Alloc(FX_MTRANDOMCONTEXT, 1);
   pContext->mt[0] = dwSeed;
   uint32_t& i = pContext->mti;
   uint32_t* pBuf = pContext->mt;
   for (i = 1; i < MT_N; i++) {
     pBuf[i] = (1812433253UL * (pBuf[i - 1] ^ (pBuf[i - 1] >> 30)) + i);
   }
   pContext->bHaveSeed = TRUE;
   return pContext;
 }
 uint32_t FX_Random_MT_Generate(void* pContext) {
   FXSYS_assert(pContext);
   FX_MTRANDOMCONTEXT* pMTC = static_cast<FX_MTRANDOMCONTEXT*>(pContext);
   uint32_t v;
   static uint32_t mag[2] = {0, MT_Matrix_A};
   uint32_t& mti = pMTC->mti;
   uint32_t* pBuf = pMTC->mt;
   if ((int)mti < 0 || mti >= MT_N) {
     if (mti > MT_N && !pMTC->bHaveSeed) {
       return 0;
     }
     uint32_t kk;
     for (kk = 0; kk < MT_N - MT_M; kk++) {
       v = (pBuf[kk] & MT_Upper_Mask) | (pBuf[kk + 1] & MT_Lower_Mask);
       pBuf[kk] = pBuf[kk + MT_M] ^ (v >> 1) ^ mag[v & 1];
     }
     for (; kk < MT_N - 1; kk++) {
       v = (pBuf[kk] & MT_Upper_Mask) | (pBuf[kk + 1] & MT_Lower_Mask);
       pBuf[kk] = pBuf[kk + (MT_M - MT_N)] ^ (v >> 1) ^ mag[v & 1];
     }
     v = (pBuf[MT_N - 1] & MT_Upper_Mask) | (pBuf[0] & MT_Lower_Mask);
     pBuf[MT_N - 1] = pBuf[MT_M - 1] ^ (v >> 1) ^ mag[v & 1];
     mti = 0;
   }
   v = pBuf[mti++];
   v ^= (v >> 11);
   v ^= (v << 7) & 0x9d2c5680UL;
   v ^= (v << 15) & 0xefc60000UL;
   v ^= (v >> 18);
   return v;
 }
 void FX_Random_MT_Close(void* pContext) {
   FXSYS_assert(pContext);
   FX_Free(pContext);
 }
 void FX_Random_GenerateMT(uint32_t* pBuffer, int32_t iCount) {
   uint32_t dwSeed;
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
   if (!FX_GenerateCryptoRandom(&dwSeed, 1)) {
     FX_Random_GenerateBase(&dwSeed, 1);
   }
 #else
   FX_Random_GenerateBase(&dwSeed, 1);
 #endif
   void* pContext = FX_Random_MT_Start(dwSeed);
   while (iCount-- > 0) {
     *pBuffer++ = FX_Random_MT_Generate(pContext);
   }
   FX_Random_MT_Close(pContext);
 }
 void FX_Random_GenerateBase(uint32_t* pBuffer, int32_t iCount) {
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
   SYSTEMTIME st1, st2;
   ::GetSystemTime(&st1);
   do {
     ::GetSystemTime(&st2);
   } while (FXSYS_memcmp(&st1, &st2, sizeof(SYSTEMTIME)) == 0);
   uint32_t dwHash1 =
       FX_HashCode_String_GetA((const FX_CHAR*)&st1, sizeof(st1), TRUE);
   uint32_t dwHash2 =
       FX_HashCode_String_GetA((const FX_CHAR*)&st2, sizeof(st2), TRUE);
   ::srand((dwHash1 << 16) | (uint32_t)dwHash2);
 #else
   time_t tmLast = time(NULL);
   time_t tmCur;
   while ((tmCur = time(NULL)) == tmLast) {
     continue;
   }

   ::srand((tmCur << 16) | (tmLast & 0xFFFF));
 #endif
   while (iCount-- > 0) {
     *pBuffer++ = (uint32_t)((::rand() << 16) | (::rand() & 0xFFFF));
   }
 }
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
 FX_BOOL FX_GenerateCryptoRandom(uint32_t* pBuffer, int32_t iCount) {
   HCRYPTPROV hCP = NULL;
   if (!::CryptAcquireContext(&hCP, NULL, NULL, PROV_RSA_FULL, 0) || !hCP) {
     return FALSE;
   }
   ::CryptGenRandom(hCP, iCount * sizeof(uint32_t), (uint8_t*)pBuffer);
   ::CryptReleaseContext(hCP, 0);
   return TRUE;
 }
 #endif
 void FX_Random_GenerateCrypto(uint32_t* pBuffer, int32_t iCount) {
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
   FX_GenerateCryptoRandom(pBuffer, iCount);
 #else
   FX_Random_GenerateBase(pBuffer, iCount);
 #endif
 }

 #ifdef PDF_ENABLE_XFA
 void FX_GUID_CreateV4(FX_LPGUID pGUID) {
   FX_Random_GenerateMT((uint32_t*)pGUID, 4);
   uint8_t& b = ((uint8_t*)pGUID)[6];
   b = (b & 0x0F) | 0x40;
 }
 const FX_CHAR* gs_FX_pHexChars = "0123456789ABCDEF";
 void FX_GUID_ToString(FX_LPCGUID pGUID,
                       CFX_ByteString& bsStr,
                       FX_BOOL bSeparator) {
   FX_CHAR* pBuf = bsStr.GetBuffer(40);
   uint8_t b;
   for (int32_t i = 0; i < 16; i++) {
     b = ((const uint8_t*)pGUID)[i];
     *pBuf++ = gs_FX_pHexChars[b >> 4];
     *pBuf++ = gs_FX_pHexChars[b & 0x0F];
     if (bSeparator && (i == 3 || i == 5 || i == 7 || i == 9)) {
       *pBuf++ = L'-';
     }
   }
   bsStr.ReleaseBuffer(bSeparator ? 36 : 32);
 }
 #endif  // PDF_ENABLE_XFA
	// 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/extension.h"
	#include "core/fxcrt/include/fx_basic.h"
	#include "core/fxcrt/include/fx_ext.h"

	#if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
	#include <wincrypt.h>
	#else
	#include <ctime>
	#endif

	CFX_CRTFileStream::CFX_CRTFileStream(IFXCRT_FileAccess* pFA)
	: m_pFile(pFA), m_dwCount(1) {}

	CFX_CRTFileStream::~CFX_CRTFileStream() {
	if (m_pFile) {
	m_pFile->Release();
	}
	}

	IFX_FileStream* CFX_CRTFileStream::Retain() {
	m_dwCount++;
	return this;
	}

	void CFX_CRTFileStream::Release() {
	uint32_t nCount = --m_dwCount;
	if (!nCount) {
	delete this;
	}
	}

	FX_FILESIZE CFX_CRTFileStream::GetSize() {
	return m_pFile->GetSize();
	}

	FX_BOOL CFX_CRTFileStream::IsEOF() {
	return GetPosition() >= GetSize();
	}

	FX_FILESIZE CFX_CRTFileStream::GetPosition() {
	return m_pFile->GetPosition();
	}

	FX_BOOL CFX_CRTFileStream::ReadBlock(void* buffer,
	FX_FILESIZE offset,
	size_t size) {
	return (FX_BOOL)m_pFile->ReadPos(buffer, size, offset);
	}

	size_t CFX_CRTFileStream::ReadBlock(void* buffer, size_t size) {
	return m_pFile->Read(buffer, size);
	}

	FX_BOOL CFX_CRTFileStream::WriteBlock(const void* buffer,
	FX_FILESIZE offset,
	size_t size) {
	return (FX_BOOL)m_pFile->WritePos(buffer, size, offset);
	}

	FX_BOOL CFX_CRTFileStream::Flush() {
	return m_pFile->Flush();
	}

	#ifdef PDF_ENABLE_XFA
	IFX_FileAccess* FX_CreateDefaultFileAccess(const CFX_WideStringC& wsPath) {
	if (wsPath.GetLength() == 0)
	return NULL;

	CFX_CRTFileAccess* pFA = NULL;
	pFA = new CFX_CRTFileAccess;
	if (NULL == pFA)
	return NULL;

	pFA->Init(wsPath);
	return pFA;
	}
	#endif // PDF_ENABLE_XFA

	IFX_FileStream* FX_CreateFileStream(const FX_CHAR* filename, uint32_t dwModes) {
	IFXCRT_FileAccess* pFA = FXCRT_FileAccess_Create();
	if (!pFA) {
	return NULL;
	}
	if (!pFA->Open(filename, dwModes)) {
	pFA->Release();
	return NULL;
	}
	return new CFX_CRTFileStream(pFA);
	}
	IFX_FileStream* FX_CreateFileStream(const FX_WCHAR* filename,
	uint32_t dwModes) {
	IFXCRT_FileAccess* pFA = FXCRT_FileAccess_Create();
	if (!pFA) {
	return NULL;
	}
	if (!pFA->Open(filename, dwModes)) {
	pFA->Release();
	return NULL;
	}
	return new CFX_CRTFileStream(pFA);
	}
	IFX_FileRead* FX_CreateFileRead(const FX_CHAR* filename) {
	return FX_CreateFileStream(filename, FX_FILEMODE_ReadOnly);
	}
	IFX_FileRead* FX_CreateFileRead(const FX_WCHAR* filename) {
	return FX_CreateFileStream(filename, FX_FILEMODE_ReadOnly);
	}
	IFX_MemoryStream* FX_CreateMemoryStream(uint8_t* pBuffer,
	size_t dwSize,
	FX_BOOL bTakeOver) {
	return new CFX_MemoryStream(pBuffer, dwSize, bTakeOver);
	}
	IFX_MemoryStream* FX_CreateMemoryStream(FX_BOOL bConsecutive) {
	return new CFX_MemoryStream(bConsecutive);
	}

	FX_FLOAT FXSYS_tan(FX_FLOAT a) {
	return (FX_FLOAT)tan(a);
	}
	FX_FLOAT FXSYS_logb(FX_FLOAT b, FX_FLOAT x) {
	return FXSYS_log(x) / FXSYS_log(b);
	}
	FX_FLOAT FXSYS_strtof(const FX_CHAR* pcsStr,
	int32_t iLength,
	int32_t* pUsedLen) {
	FXSYS_assert(pcsStr);
	if (iLength < 0) {
	iLength = (int32_t)FXSYS_strlen(pcsStr);
	}
	CFX_WideString ws =
	CFX_WideString::FromLocal(CFX_ByteString(pcsStr, iLength));
	return FXSYS_wcstof(ws.c_str(), iLength, pUsedLen);
	}
	FX_FLOAT FXSYS_wcstof(const FX_WCHAR* pwsStr,
	int32_t iLength,
	int32_t* pUsedLen) {
	FXSYS_assert(pwsStr);
	if (iLength < 0) {
	iLength = (int32_t)FXSYS_wcslen(pwsStr);
	}
	if (iLength == 0) {
	return 0.0f;
	}
	int32_t iUsedLen = 0;
	FX_BOOL bNegtive = FALSE;
	switch (pwsStr[iUsedLen]) {
	case '-':
	bNegtive = TRUE;
	case '+':
	iUsedLen++;
	break;
	}
	FX_FLOAT fValue = 0.0f;
	while (iUsedLen < iLength) {
	FX_WCHAR wch = pwsStr[iUsedLen];
	if (wch >= L'0' && wch <= L'9') {
	fValue = fValue * 10.0f + (wch - L'0');
	} else {
	break;
	}
	iUsedLen++;
	}
	if (iUsedLen < iLength && pwsStr[iUsedLen] == L'.') {
	FX_FLOAT fPrecise = 0.1f;
	while (++iUsedLen < iLength) {
	FX_WCHAR wch = pwsStr[iUsedLen];
	if (wch >= L'0' && wch <= L'9') {
	fValue += (wch - L'0') * fPrecise;
	fPrecise *= 0.1f;
	} else {
	break;
	}
	}
	}
	if (pUsedLen) {
	*pUsedLen = iUsedLen;
	}
	return bNegtive ? -fValue : fValue;
	}
	FX_WCHAR* FXSYS_wcsncpy(FX_WCHAR* dstStr,
	const FX_WCHAR* srcStr,
	size_t count) {
	FXSYS_assert(dstStr && srcStr && count > 0);
	for (size_t i = 0; i < count; ++i)
	if ((dstStr[i] = srcStr[i]) == L'\0') {
	break;
	}
	return dstStr;
	}
	int32_t FXSYS_wcsnicmp(const FX_WCHAR* s1, const FX_WCHAR* s2, size_t count) {
	FXSYS_assert(s1 && s2 && count > 0);
	FX_WCHAR wch1 = 0, wch2 = 0;
	while (count-- > 0) {
	wch1 = (FX_WCHAR)FXSYS_tolower(*s1++);
	wch2 = (FX_WCHAR)FXSYS_tolower(*s2++);
	if (wch1 != wch2) {
	break;
	}
	}
	return wch1 - wch2;
	}
	int32_t FXSYS_strnicmp(const FX_CHAR* s1, const FX_CHAR* s2, size_t count) {
	FXSYS_assert(s1 && s2 && count > 0);
	FX_CHAR ch1 = 0, ch2 = 0;
	while (count-- > 0) {
	ch1 = (FX_CHAR)FXSYS_tolower(*s1++);
	ch2 = (FX_CHAR)FXSYS_tolower(*s2++);
	if (ch1 != ch2) {
	break;
	}
	}
	return ch1 - ch2;
	}
	uint32_t FX_HashCode_String_GetA(const FX_CHAR* pStr,
	int32_t iLength,
	FX_BOOL bIgnoreCase) {
	FXSYS_assert(pStr);
	if (iLength < 0) {
	iLength = (int32_t)FXSYS_strlen(pStr);
	}
	const FX_CHAR* pStrEnd = pStr + iLength;
	uint32_t dwHashCode = 0;
	if (bIgnoreCase) {
	while (pStr < pStrEnd) {
	dwHashCode = 31 * dwHashCode + FXSYS_tolower(*pStr++);
	}
	} else {
	while (pStr < pStrEnd) {
	dwHashCode = 31 * dwHashCode + *pStr++;
	}
	}
	return dwHashCode;
	}
	uint32_t FX_HashCode_String_GetW(const FX_WCHAR* pStr,
	int32_t iLength,
	FX_BOOL bIgnoreCase) {
	FXSYS_assert(pStr);
	if (iLength < 0) {
	iLength = (int32_t)FXSYS_wcslen(pStr);
	}
	const FX_WCHAR* pStrEnd = pStr + iLength;
	uint32_t dwHashCode = 0;
	if (bIgnoreCase) {
	while (pStr < pStrEnd) {
	dwHashCode = 1313 * dwHashCode + FXSYS_tolower(*pStr++);
	}
	} else {
	while (pStr < pStrEnd) {
	dwHashCode = 1313 * dwHashCode + *pStr++;
	}
	}
	return dwHashCode;
	}

	void* FX_Random_MT_Start(uint32_t dwSeed) {
	FX_MTRANDOMCONTEXT* pContext = FX_Alloc(FX_MTRANDOMCONTEXT, 1);
	pContext->mt[0] = dwSeed;
	uint32_t& i = pContext->mti;
	uint32_t* pBuf = pContext->mt;
	for (i = 1; i < MT_N; i++) {
	pBuf[i] = (1812433253UL * (pBuf[i - 1] ^ (pBuf[i - 1] >> 30)) + i);
	}
	pContext->bHaveSeed = TRUE;
	return pContext;
	}
	uint32_t FX_Random_MT_Generate(void* pContext) {
	FXSYS_assert(pContext);
	FX_MTRANDOMCONTEXT* pMTC = static_cast<FX_MTRANDOMCONTEXT*>(pContext);
	uint32_t v;
	static uint32_t mag[2] = {0, MT_Matrix_A};
	uint32_t& mti = pMTC->mti;
	uint32_t* pBuf = pMTC->mt;
	if ((int)mti < 0 \|\| mti >= MT_N) {
	if (mti > MT_N && !pMTC->bHaveSeed) {
	return 0;
	}
	uint32_t kk;
	for (kk = 0; kk < MT_N - MT_M; kk++) {
	v = (pBuf[kk] & MT_Upper_Mask) \| (pBuf[kk + 1] & MT_Lower_Mask);
	pBuf[kk] = pBuf[kk + MT_M] ^ (v >> 1) ^ mag[v & 1];
	}
	for (; kk < MT_N - 1; kk++) {
	v = (pBuf[kk] & MT_Upper_Mask) \| (pBuf[kk + 1] & MT_Lower_Mask);
	pBuf[kk] = pBuf[kk + (MT_M - MT_N)] ^ (v >> 1) ^ mag[v & 1];
	}
	v = (pBuf[MT_N - 1] & MT_Upper_Mask) \| (pBuf[0] & MT_Lower_Mask);
	pBuf[MT_N - 1] = pBuf[MT_M - 1] ^ (v >> 1) ^ mag[v & 1];
	mti = 0;
	}
	v = pBuf[mti++];
	v ^= (v >> 11);
	v ^= (v << 7) & 0x9d2c5680UL;
	v ^= (v << 15) & 0xefc60000UL;
	v ^= (v >> 18);
	return v;
	}
	void FX_Random_MT_Close(void* pContext) {
	FXSYS_assert(pContext);
	FX_Free(pContext);
	}
	void FX_Random_GenerateMT(uint32_t* pBuffer, int32_t iCount) {
	uint32_t dwSeed;
	#if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
	if (!FX_GenerateCryptoRandom(&dwSeed, 1)) {
	FX_Random_GenerateBase(&dwSeed, 1);
	}
	#else
	FX_Random_GenerateBase(&dwSeed, 1);
	#endif
	void* pContext = FX_Random_MT_Start(dwSeed);
	while (iCount-- > 0) {
	*pBuffer++ = FX_Random_MT_Generate(pContext);
	}
	FX_Random_MT_Close(pContext);
	}
	void FX_Random_GenerateBase(uint32_t* pBuffer, int32_t iCount) {
	#if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
	SYSTEMTIME st1, st2;
	::GetSystemTime(&st1);
	do {
	::GetSystemTime(&st2);
	} while (FXSYS_memcmp(&st1, &st2, sizeof(SYSTEMTIME)) == 0);
	uint32_t dwHash1 =
	FX_HashCode_String_GetA((const FX_CHAR*)&st1, sizeof(st1), TRUE);
	uint32_t dwHash2 =
	FX_HashCode_String_GetA((const FX_CHAR*)&st2, sizeof(st2), TRUE);
	::srand((dwHash1 << 16) \| (uint32_t)dwHash2);
	#else
	time_t tmLast = time(NULL);
	time_t tmCur;
	while ((tmCur = time(NULL)) == tmLast) {
	continue;
	}

	::srand((tmCur << 16) \| (tmLast & 0xFFFF));
	#endif
	while (iCount-- > 0) {
	*pBuffer++ = (uint32_t)((::rand() << 16) \| (::rand() & 0xFFFF));
	}
	}
	#if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
	FX_BOOL FX_GenerateCryptoRandom(uint32_t* pBuffer, int32_t iCount) {
	HCRYPTPROV hCP = NULL;
	if (!::CryptAcquireContext(&hCP, NULL, NULL, PROV_RSA_FULL, 0) \|\| !hCP) {
	return FALSE;
	}
	::CryptGenRandom(hCP, iCount * sizeof(uint32_t), (uint8_t*)pBuffer);
	::CryptReleaseContext(hCP, 0);
	return TRUE;
	}
	#endif
	void FX_Random_GenerateCrypto(uint32_t* pBuffer, int32_t iCount) {
	#if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
	FX_GenerateCryptoRandom(pBuffer, iCount);
	#else
	FX_Random_GenerateBase(pBuffer, iCount);
	#endif
	}

	#ifdef PDF_ENABLE_XFA
	void FX_GUID_CreateV4(FX_LPGUID pGUID) {
	FX_Random_GenerateMT((uint32_t*)pGUID, 4);
	uint8_t& b = ((uint8_t*)pGUID)[6];
	b = (b & 0x0F) \| 0x40;
	}
	const FX_CHAR* gs_FX_pHexChars = "0123456789ABCDEF";
	void FX_GUID_ToString(FX_LPCGUID pGUID,
	CFX_ByteString& bsStr,
	FX_BOOL bSeparator) {
	FX_CHAR* pBuf = bsStr.GetBuffer(40);
	uint8_t b;
	for (int32_t i = 0; i < 16; i++) {
	b = ((const uint8_t*)pGUID)[i];
	*pBuf++ = gs_FX_pHexChars[b >> 4];
	*pBuf++ = gs_FX_pHexChars[b & 0x0F];
	if (bSeparator && (i == 3 \|\| i == 5 \|\| i == 7 \|\| i == 9)) {
	*pBuf++ = L'-';
	}
	}
	bsStr.ReleaseBuffer(bSeparator ? 36 : 32);
	}
	#endif // PDF_ENABLE_XFA