Python生成文件的MD5和sha1详解编程语言

生成文件的MD5和sha1    

#coding=UTF-8 
# XingHe Studio File to MD5 and SHA1 
# 星河创作室(XingHeStudio.com) 
# Create by Stream.Wang 2012-04-10 
# Modify by Stream.Wang 2012-04-10 
 
def fil_changefileext(filename,extname=''): 
    # FIL ChangeFileExt 改变文件扩展名 
    # filename    输入的文件路径名 
    # extname=''  要更改分扩展名，如 .txt 
    import os 
    try: 
        if extname[0]<>'.': 
            extname='.'+extname 
    except: 
        extname='' 
    if os.path.splitext(filename)[1]=='': 
        uouttxt=filename+'.'+extname 
    elif os.path.splitext(filename)[1]=='.': 
        uouttxt=filename+extname     
    else: 
        uouttxt=filename[:0-len(os.path.splitext(filename)[1])]+extname 
    return uouttxt 
 
def fil_str2file(fstr,filename): 
    # FIL STR2File 把字符串保存到文件  
    try: 
        outfile=open(filename,'w') 
        outfile.writelines(fstr) 
        outfile.close() 
        return True     
    except: 
        return False 
     
#系统主程序开始 
#------------------------------------------------------- 
if __name__ == '__main__':     
    import os,sys,math 
    # if len(sys.argv)==1:sys.argv.append(r'c:/FreeNAS-8.0.4-RELEASE-x64.iso') 
    if len(sys.argv)>1: 
        filepathname=sys.argv[1] 
        if os.path.isfile(filepathname) : 
            fmaxs = os.path.getsize(filepathname)+0.00 
            fpos = 0.00 
            ppos=0   
            pmax=50 
            pjy=0           
            fmd5=fil_changefileext(filepathname,'.md5') 
            fsha1=fil_changefileext(filepathname,'.sha') 
            ffm=os.path.basename(filepathname)             
            #开始处理 
            print 'Program Runing "'+filepathname+'" ...' 
            import hashlib 
            try: 
                umd5str = hashlib.md5() 
                usha1str = hashlib.sha1() 
                xfilepathname=unicode(filepathname,'utf8') 
                #需要使用二进制格式读取文件内容 
                ufile = file(xfilepathname,'rb') 
                while True: 
                    datas = ufile.read(1024*512) 
                    if not datas: break 
                    umd5str.update( datas ) 
                    usha1str.update( datas ) 
                    fpos=fpos+1024*512 
                    ppos=int(math.floor(fpos / fmaxs * 50)) 
                    pposbfh=int(math.floor(fpos / fmaxs * 100)) 
                    #打印进度条 
                    if pjy<>ppos: print '['+'*'*ppos +'='*(pmax-ppos)+'] '+str(pposbfh) +'%' 
                    #打印进度问题未解决，不知道print函数怎么退回到行首覆盖输出，不换行我倒是知道，加个“,”   
                    pjy=ppos  
                uoutstrmd5=str(umd5str.hexdigest()) 
                uoutstrsha1=str(usha1str.hexdigest()) 
                ufile.close() 
                print '' 
                fil_str2file(uoutstrmd5+' *'+ffm+'/n',fmd5) 
                fil_str2file(uoutstrsha1+' *'+ffm+'/n',fsha1) 
                print 'Task is completed !' + r' [ XingHe Studio File to MD5 and SHA1 ]'                 
            except:         
                print 'Error !' + r' [ XingHe Studio File to MD5 and SHA1 ]' 
        else: 
            print 'File "'+filepathname+'" not exist!'+ r' [ XingHe Studio File to MD5 and SHA1 ]' 
    else: 
        print  r' [ XingHe Studio File to MD5 and SHA1 ]'