cnvregex.c

/*
  The MIT License (MIT)

  Copyright (c) 2015 Convey Compliance Systems, Inc.

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
*/

#include "cnvregex.h"
#include <assert.h>

typedef char* (__cdecl *RegExpr_Create_t)(void ** _this);
typedef char* (__cdecl *RegExpr_Free_t)(void* _this);
typedef char* (__cdecl *RegExpr_SetInputString_t)(void* _this, char* AInputString);
typedef char* (__cdecl *RegExpr_SetExpression_t)(void* _this, char* AExpression);
typedef wchar_t* (__cdecl *RegExpr_SetInputStringW_t)(void* _this, wchar_t* AInputString);
typedef wchar_t* (__cdecl *RegExpr_SetExpressionW_t)(void* _this, wchar_t* AExpression);
typedef char* (__cdecl *RegExpr_Exec_t)(void* _this, BOOL* AMatch);
typedef char* (__cdecl *RegExpr_ExecNext_t)(void* _this, BOOL* AMore);
typedef void (__cdecl *OverrideMemAllocator_t)(GetMem_t pGetMem, ReallocMem_t pReallocMem, FreeMem_t pFreeMem);
typedef void (__cdecl *ResetMemAllocator_t)();

static HMODULE RegExLib = 0;
static volatile long RegExLibLoadCount = 0;

static RegExpr_Create_t RegExpr_CreateFn = NULL;
static RegExpr_Free_t RegExpr_FreeFn = NULL;
static RegExpr_SetInputString_t RegExpr_SetInputStringFn = NULL;
static RegExpr_SetExpression_t RegExpr_SetExpressionFn = NULL;
static RegExpr_SetInputStringW_t RegExpr_SetInputStringWFn = NULL;
static RegExpr_SetExpressionW_t RegExpr_SetExpressionWFn = NULL;
static RegExpr_Exec_t RegExpr_ExecFn = NULL;
static RegExpr_ExecNext_t RegExpr_ExecNextFn = NULL;
static OverrideMemAllocator_t OverrideMemAllocatorFn = NULL;
static ResetMemAllocator_t ResetMemAllocatorFn = NULL;

#define INIT_DLL_FUNCTION(FNNAME) \
  FNNAME##Fn = (FNNAME##_t)GetProcAddress(RegExLib, #FNNAME); \
  assert(FNNAME##Fn)

#define DONE_DLL_FUNCTION(FNNAME) FNNAME##Fn = NULL 

void InitCnvRegEx() {
  long LoadCounter = InterlockedIncrement( &RegExLibLoadCount );
  if( LoadCounter > 1 ) return;

  RegExLib = LoadLibraryA(CNVREGEX_DLL);

  INIT_DLL_FUNCTION(RegExpr_Create);
  INIT_DLL_FUNCTION(RegExpr_Free);
  INIT_DLL_FUNCTION(RegExpr_SetInputString);
  INIT_DLL_FUNCTION(RegExpr_SetExpression);  
  INIT_DLL_FUNCTION(RegExpr_SetInputStringW);
  INIT_DLL_FUNCTION(RegExpr_SetExpressionW);
  INIT_DLL_FUNCTION(RegExpr_Exec);
  INIT_DLL_FUNCTION(RegExpr_ExecNext);
  INIT_DLL_FUNCTION(OverrideMemAllocator);
  INIT_DLL_FUNCTION(ResetMemAllocator);
}

void DoneCnvRegEx() {
  long LoadCounter = InterlockedDecrement( &RegExLibLoadCount );
  if( LoadCounter > 0 ) return;

  DONE_DLL_FUNCTION(RegExpr_Create);
  DONE_DLL_FUNCTION(RegExpr_Free);
  DONE_DLL_FUNCTION(RegExpr_SetInputString);
  DONE_DLL_FUNCTION(RegExpr_SetExpression);
  DONE_DLL_FUNCTION(RegExpr_SetInputStringW);
  DONE_DLL_FUNCTION(RegExpr_SetExpressionW);
  DONE_DLL_FUNCTION(RegExpr_Exec);
  DONE_DLL_FUNCTION(RegExpr_ExecNext);
  DONE_DLL_FUNCTION(OverrideMemAllocator);
  DONE_DLL_FUNCTION(ResetMemAllocator);

  FreeLibrary(RegExLib);
}

void OverrideMemAllocator(GetMem_t pGetMem, ReallocMem_t pReallocMem, FreeMem_t pFreeMem) {
  assert(OverrideMemAllocatorFn);
  OverrideMemAllocatorFn(pGetMem, pReallocMem, pFreeMem);
}

void ResetMemAllocator() {
  assert(ResetMemAllocatorFn);
  ResetMemAllocatorFn();
}

char* RegExpr_Create(void ** _this) {
  assert(RegExpr_CreateFn);
  return RegExpr_CreateFn(_this);
}

char* RegExpr_Free(void* _this) {
  assert(RegExpr_FreeFn);
  return RegExpr_FreeFn(_this);
}

char* RegExpr_SetInputString(void* _this, char* AInputString) {
  assert(RegExpr_SetInputStringFn);
  return RegExpr_SetInputStringFn(_this, AInputString);
}

char* RegExpr_SetExpression(void* _this, char* AExpression) {
  assert(RegExpr_SetExpressionFn);
  return RegExpr_SetExpressionFn(_this, AExpression);
}

wchar_t* RegExpr_SetInputStringW(void* _this, wchar_t* AInputString) {
  assert(RegExpr_SetInputStringWFn);
  return RegExpr_SetInputStringWFn(_this, AInputString);
}

wchar_t* RegExpr_SetExpressionW(void* _this, wchar_t* AExpression) {
  assert(RegExpr_SetExpressionWFn);
  return RegExpr_SetExpressionWFn(_this, AExpression);
}

char* RegExpr_Exec(void* _this, BOOL* AMatch) {
  assert(RegExpr_ExecFn);
  return RegExpr_ExecFn(_this, AMatch);
}

char* RegExpr_ExecNext(void* _this, BOOL* AMore) {
  assert(RegExpr_ExecNextFn);
  return RegExpr_ExecNextFn(_this, AMore);
}