{"id":1330,"date":"2013-10-12T12:46:58","date_gmt":"2013-10-12T04:46:58","guid":{"rendered":"http:\/\/www.freemindworld.com\/blog\/?p=1330"},"modified":"2013-10-12T12:46:58","modified_gmt":"2013-10-12T04:46:58","slug":"131012_decrypt_gwbasic_file","status":"publish","type":"post","link":"https:\/\/www.freemindworld.com\/blog\/2013\/131012_decrypt_gwbasic_file.shtml","title":{"rendered":"\u89e3\u5bc6GW-BASIC\u7684\u52a0\u5bc6\u6587\u4ef6"},"content":{"rendered":"

\u7ec8\u4e8e\u89e3\u5bc6\u4e86\u4e00\u4efd1993\u5e74\u5de6\u53f3\u7684BASIC\u4ee3\u7801\uff0c\u8fd9\u4e48\u591a\u5e74\u4e00\u76f4\u60f3\u770b\u8fd9\u4efd\u4ee3\u7801\u7684\u5185\u5bb9\uff0c\u73b0\u5728\u7ec8\u4e8e\u770b\u5230\u4e86\uff0c\u9887\u6709\u4e00\u4e9b\u550f\u5618\u4e4b\u611f\u3002<\/p>\n

\u76ee\u524d\u7f51\u4e0a\u4f3c\u4e4e\u641c\u4e0d\u5230\u4e2d\u6587\u8d44\u6599\u4ecb\u7ecd\u5982\u4f55\u89e3\u5bc6\u52a0\u5bc6\u8fc7\u7684BASIC\u4ee3\u7801\uff0c\u6211\u603b\u7ed3\u4e00\u4e0b\u653e\u5728\u8fd9\u91cc\u3002\u806a\u660e\u4eba\u53ef\u4ee5\u76f4\u63a5\u8df3\u5230\u201c\u89e3\u5bc6\u65b9\u6cd5\u4e8c\u201d\u9605\u8bfb\u3002<\/p>\n

\u80cc\u666f\uff1a<\/strong><\/p>\n

DOS\u4e0b\u7684GW-BASIC\u5728\u4fdd\u5b58\u4ee3\u7801\u65f6\uff0c\u53ef\u4ee5\u5b58\u6210tokenized\u3001\u7eaf\u6587\u672c\u548c\u52a0\u5bc6\u4e09\u79cd\u683c\u5f0f\uff0c\u5206\u522b\u5bf9\u5e94SAVE\u547d\u4ee4\u7684\u9ed8\u8ba4\u53c2\u6570\u3001\u201c,a\u201d\u548c\u201c,p\u201d\u53c2\u6570\u3002<\/p>\n

\u5bf9\u4e8e\u7528\u4e86,p\u53c2\u6570\u4fdd\u5b58\u7684\u6e90\u4ee3\u7801\uff0c\u4ee5\u540e\u5c31\u53ea\u80fdLOAD\u5230\u5185\u5b58\u4e2d\u6267\u884c\uff0c\u800c\u4e0d\u5141\u8bb8\u518dLIST\u67e5\u770b\u6e90\u4ee3\u7801\u4e86\u3002\u672c\u6587\u4ecb\u7ecd\u7684\u5c31\u662f\u7528\u4e8e\u89e3\u5bc6\u67e5\u770b,p\u53c2\u6570\u4fdd\u5b58\u7684\u6e90\u4ee3\u7801\u7684\u65b9\u6cd5\u3002<\/p>\n

\u89e3\u5bc6\u65b9\u6cd5\u4e00\uff1a<\/strong><\/p>\n

\u53c2\u8003GW-BASIC tokenised program format<\/a>\u3002<\/p>\n

\u539f\u7406\u662f\u627e\u5230GW-BASIC\u4e2d\u6807\u8bb0\u4ee3\u7801\u662f\u5426\u662f\u52a0\u5bc6\u7684\u90a3\u4e2a\u5185\u5b58\u5730\u5740\uff0c\u7136\u540e\u7528VAL\u547d\u4ee4\u7684\u4e00\u4e2a\u6ea2\u51faBug\uff0c\u4fee\u6539\u8fd9\u4e2a\u5185\u5b58\u5730\u5740\u7684\u503c\u3002<\/p>\n

\u7b2c\u4e00\u6b65\uff0c\u8fd0\u884c\u4e00\u4e0b\u5982\u4e0b\u7684\u7a0b\u5e8f\uff0c\u627e\u5230\u52a0\u5bc6\u6807\u8bb0\u7684\u5730\u5740\uff1a<\/p>\n

FOR I=1000 TO 16000:PRINT I: J=PEEK(I): POKE I,((J=0)AND 255) OR J: POKE I,J:NEXT I<\/code><\/p>\n

\u8fd9\u4e2a\u7a0b\u5e8f\u4f1a\u5bfc\u81f4Illegal function call\u9519\u8bef\uff0c\u8bb0\u4e0b\u51fa\u9519\u524d\u7a0b\u5e8f\u6253\u5370\u51fa\u6765\u7684\u6570\u5b57\u3002<\/p>\n

\u7b2c\u4e8c\u6b65\uff0c\u6b63\u5e38\u7528LOAD\u547d\u4ee4\u52a0\u8f7d\u8981\u52a0\u5bc6\u7684.BAS\u6587\u4ef6\u3002<\/p>\n

\u7b2c\u4e09\u6b65\uff0c\u8f93\u5165\u4e0b\u9762\u7684\u7a0b\u5e8f\uff0c\u5e76\u628a\u5176\u4e2d\u7684a%[9]\u7684\u503c”1450″\u6539\u4e3a\u7b2c\u4e00\u6b65\u4e2d\u8bb0\u5f55\u4e0b\u6765\u7684\u6570\u5b57\u3002
\n
\ndim a%[14]
\na%[0]=0:a%[1]=&h2020:a%[2]=&h2020:a%[3]=&h2097
\na%[4]=&h4553:a%[5]=&h2047:a%[6]=&H203A:a%[7]=&H2098
\na%[8]=&H1C20:a%[9]=1450:a%[10]=&h112C
\na%[11]=&h903A:a%[12]=0
\nb$=\"\"
\nb$=\"123\"+chr$(28)+\":::\"+chr$(137)+chr$(13)+mki$(varptr(a%[0]))+\":\"
\nprint val(b$) 456
\n<\/code><\/p>\n

\u5b8c\u6210\uff0c\u73b0\u5728\u5df2\u7ecf\u53ef\u4ee5\u7528LIST\u547d\u4ee4\u6b63\u5e38\u5217\u51fa\u89e3\u5bc6\u540e\u7684\u4ee3\u7801\u4e86\u3002<\/p>\n

\u89e3\u5bc6\u65b9\u6cd5\u4e8c\uff1a<\/strong><\/p>\n

\u5f53\u6211\u8fd8\u6c89\u6d78\u5728\u6210\u529f\u89e3\u5bc6\u4e86BAS\u6587\u4ef6\u7684\u559c\u60a6\u4e2d\u65f6\uff0c\u65e0\u5fc3\u7684\u4e00\u6b21\u641c\u7d22\u8ba9\u6211\u53c8\u627e\u5230\u4e86\u66f4\u7b80\u5355\u7684\u89e3\u5bc6\u65b9\u6cd5<\/a>\u3002<\/p>\n

\u521b\u5efa\u4e00\u4e2a\u53ea\u6709\u4e24\u4e2a\u5b57\u8282\u7684UNPROT.BAS\u6587\u4ef6\uff0c\u8fd9\u4e24\u4e2a\u5b57\u8282\u662f0xFF 0x0A\u3002<\/p>\n

\u5148LOAD\u8981\u89e3\u5bc6\u7684.BAS\uff0c\u7136\u540e\u518dLOAD\u4e00\u4e0b\u8fd9\u4e2aUNPROT.BAS\uff0c\u7136\u540e\u5c31\u89e3\u5bc6\u6210\u529f\u4e86\u3002<\/p>\n

\u5982\u679c\u662f\u5728DOS\u4e0b\u8981\u521b\u5efa\u8fd9\u4e48\u4e2a\u6587\u4ef6\u8fd8\u771f\u6709\u70b9\u9ebb\u70e6\uff0c\u6bd4\u8f83\u7b80\u5355\u7684\u505a\u6cd5\u662f\u7528DEBUG\uff1a<\/p>\n

C:\\>debug
\n-e 0100 ff 1a
\n-rcx
\nCX 0000
\n:0002
\n-n unprot.bas
\n-w
\nWriting 00002 bytes
\n-q
\n<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"

\u7ec8\u4e8e\u89e3\u5bc6\u4e86\u4e00\u4efd1993\u5e74\u5de6\u53f3\u7684BASIC\u4ee3\u7801\uff0c\u8fd9\u4e48\u591a\u5e74\u4e00\u76f4\u60f3\u770b\u8fd9\u4efd\u4ee3\u7801\u7684\u5185\u5bb9\uff0c\u73b0 … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,9],"tags":[],"class_list":["post-1330","post","type-post","status-publish","format-standard","hentry","category-11","category-9"],"_links":{"self":[{"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/posts\/1330","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/comments?post=1330"}],"version-history":[{"count":9,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/posts\/1330\/revisions"}],"predecessor-version":[{"id":1339,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/posts\/1330\/revisions\/1339"}],"wp:attachment":[{"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/media?parent=1330"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/categories?post=1330"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.freemindworld.com\/blog\/wp-json\/wp\/v2\/tags?post=1330"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}