問題描述
也就是說，你將如何從文本(xml/txt，編碼無關(guān))文件中區(qū)分存檔(jar/rar/etc.)文件?
Namely, how would you tell an archive (jar/rar/etc.) file from a textual (xml/txt, encoding-independent) one?
推薦答案
沒有萬全之策，但有幾種可能:
There's no guaranteed way, but here are a couple of possibilities:
在文件中查找標題.不幸的是，標頭是特定于文件的，因此雖然您可能會發(fā)現(xiàn)它是一個 RAR 文件，但您不會得到更通用的答案，即它是文本還是二進制文件.
Look for a header on the file. Unfortunately, headers are file-specific, so while you might be able to find out that it's a RAR file, you won't get the more generic answer of whether it's text or binary.
計算字符與非字符類型的數(shù)量.文本文件大多是字母字符，而二進制文件——尤其是壓縮文件，如 rar、zip 等——往往會更均勻地表示字節(jié).
Count the number of character vs. non-character types. Text files will be mostly alphabetical characters while binary files - especially compressed ones like rar, zip, and such - will tend to have bytes more evenly represented.
尋找有規(guī)律地重復的換行符.
Look for a regularly repeating pattern of newlines.
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