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Reading from an archive::archive_read connection crashes R if the connection is closed beforehand #116

@wkumler

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@wkumler

I've been handed a database in which one of the fields contains XML documents as compressed blobs (ZIP/PK archives). Rather than writing the file out to disk every time I tried using the archive package's bindings to libarchive to read it directly. It works great except that I'm trying to close the connections properly afterward and learned that R crashes if I incorrectly close the rawConnection object before reading the object, either with read_xml or readLines.

xml_text <- '<text>Hi</text>'
blob <- charToRaw(xml_text)

blob_con <- rawConnection(blob)
spec_con <- archive::archive_read(blob_con)
close(blob_con)
readLines(spec_con)
# OR
xml2::read_xml(spec_con)

The error I get when R crashes is:

Error in (function (con, rw = "")  : invalid connection
terminate called after throwing an instance of 'cpp11::unwind_exception'
  what():  std::exception

I'm on R 4.5.1 and archive version 1.1.12.

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