md5_realize.cpp

一个封装成DLL的MD5计算类

#include <stdio.h>
#include "e_os.h"
#include "md5.h"
#include "md5_realize.h"

int MD5_Realize(CHAR *theFilePath, unsigned char *md5)
{
	FILE *m_pFile;
	m_pFile = fopen(theFilePath,"rb");
	unsigned long FileSize=0xFFFF;
	WIN32_FIND_DATA  win32_find_data;
	HANDLE hFile;
	if((hFile=FindFirstFile(theFilePath,&win32_find_data))!=INVALID_HANDLE_VALUE)
		if(hFile==NULL) 
			return(0);
		if(FileSize=win32_find_data.nFileSizeLow,FileSize==0xFFFF || FileSize==0)
			return(0);
		FindClose(hFile);
		
		BYTE *buffer = (BYTE *)malloc(FileSize);
		
		fread(buffer,FileSize,1,m_pFile);
		MD5(buffer, FileSize, md5);
		fclose(m_pFile);
		free(buffer);
		
		
		return(MD5_DIGEST_LENGTH);
		
}