计算机等级考试三级PC技术上机15.doc
2013年计算机等级考试三级PC技术上机（15）请编制程序，其功能是：对一个由可打印ASCII字符(ASCII码20H7FH)组成的字符串可采用下列方法进行压缩：从串首开始向后扫描，如某字符单独出现该字符不变，如某字符连续出现n次，则该字符用ESC(1BH)，n，<原字符>三个字节来代替(假定n不超过255)。例如：设内存中从SOURCE开始有一用上述方法压缩的字符串，其以00H结束，长度不超过100。试编程对其进行解压缩，结果存入RESULT开始的内存单元。原串： 41H,1BH,06H,43H,61H,00H解压后： 41H,43H,43H,43H,43H,43H,43H,61H,00H("ACCCCCCa")部分程序已给出, 其中原始数据由过程LOAD从文件INPUT1.DAT中读入SOURCE开始的内存单元中。运算结果要求从RESULT开始存放,由过程SAVE保存到文件OUTPUT1.DAT中。填空BEGIN和END之间已给出的一段源程序使其完整(空白已用横线标出,每行空白一般只需一条指令, 但采用功能相当的多条指令亦可),或删除BEGIN和END之间原有的代码并自行编程来完成要求的功能。对程序必须进行汇编,并与IO.OBJ链接产生PROG1.EXE执行文件,最终运行程序产生结果(无结果或结果不正确者均不得分)。调试中若发现整个程序中存在错误之处, 请加以修改。试题程序：EXTRN LOAD:FAR,SAVE:FARN EQU 100ESC_CODE EQU 27STAC SEGMENT STACKDB 128 DUP(?)STAC ENDSDATA SEGMENTSOURCE DB N DUP(?)RESULT DB N DUP(0)NAME0 DB 'INPUT1.DAT',0NAME1 DB 'OUTPUT1.DAT',0DATA ENDSCODE SEGMENTASSUME CS:CODE,DS:DATA,SS:STACSTART PROC FARPUSH DSXOR AX,AXPUSH AXMOV AX,DATAMOV DS,AXMOV ES,AX ;置附加段寄存器LEA DX,SOURCE ;数据区起始地址LEA SI,NAME0 ;原始数据文件名MOV CX,N ;字节数CALL LOAD ;从'INPUT1.DAT'中读取数据;*BEGIN*LEA SI,SOURCELEA DI,RESULTCLDL0: LODSBCMP AL,0JE QUITCMP AL,ESC_CODEJ_ EXPAND_JMP L0待添加的隐藏文字内容1EXPAND: _ ;解压XOR CX,CX_JMP L0QUIT: STOSB ;STORE THE '00H'*END*LEA DX,RESULT ;结果数据区首址LEA SI,NAME1 ;结果文件名MOV CX,N ;字节数CALL SAVE ;保存结果到文件RETSTART ENDPCODE ENDSEND 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