如何确定数据是否是有效的没有文件的tar文件? [英] How to determine if data is valid tar file without a file?

问题描述

我的上传表单需要一个tar文件，我想检查上传的数据是否有效. tarfile 模块支持

My upload form expects a tar file and I want to check whether the uploaded data is valid. The tarfile module supports is_tarfile(), but expects a filename - I don't want to waste resources writing the file to disk just to check if it is valid.

是否可以使用标准Python库检查数据是否为有效的tar文件而无需写入磁盘?

Is there a way to check the data is a valid tar file without writing to disk, using standard Python libraries?

推荐答案

说您上传的数据包含在字符串data中.

Say your uploaded data is contained in string data.

from tarfile import TarFile, TarError
from StringIO import StringIO

sio = StringIO(data)
try:
    tf = TarFile(fileobj=sio)
    # process the file....
except TarError:
    print "Not a tar file"

还有其他复杂性，例如处理不同的tar文件格式和压缩. tarfile 文档中提供了更多信息.

There are additional complexities such as handling different tar file formats and compression. More info is available in the tarfile documentation.

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