ASCII Vs Binary Ftping

ASCII Vs Binary Ftping

Summary: Practical Advice WS-FTP Help offers this advice: ● A file that is text, HTML, postscript, other ASCII format (.txt, .html, .htm, .cgi), or EBCDIC should be transferred in ASCII mode. Note: Transferring a binary file in ASCII format can damage the file. ● A file that is a bitmap, an executable, or compressed (.bmp, .jpg, .exe, .zip) should be transferred in binary mode. (Binary mode should also be used if there is no file extension or the file extension is not registered.) Here's a quick overview of files and how they should be transferred: ASCII Binary .txt ASCII text .txt Unicode text - see note below .htm HTML .jpg JPEG image . Web page . html jpeg .xml Extensible Markup Language .gif CompuServe GIF image .cgi Common Gateway Interface script .png Portable Network Graphics .pl Perl scrips must be transferred in ASCII .bmp Windows bitmap image .php PHP program script .doc MS Word or Word Perfect document .cf Cold Fusion script .xls MS Excel spreadsheet .svg Scalable Vector Graphics image .mdb Microsoft database file .exe .asp MS Active Server Pages script .com Executable programs .dll .rtf Rich Text Format .zip Compressed files .ps Postscript files .pdf Adobe Acrobat Portable Document Format files Note about Unicode Unicode is the system which ultimately will replace ASCII, because it has the potential to include all the characters of all human languages. It can do this because instead of 7 bits it can use 8, 16, or 32. It is still evolving, but more and more programs are coming to use it. Since it uses all the bits in each byte, it must be transferred in binary mode. Unfortunately, the extension .txt is routinely used for Unicode text files, making it impossible to tell from the extension whether to transfer it in ASCII or binary. About this document....

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