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The basic purpose of this package of Lisp functions is to recognize automatically encrypted and encoded (i.e., compressed) files when they are first visited or written. The BUFFER corresponding to the file is decoded and/or decrypted before it is presented to the user. The file itself is unchanged on the disk. When the buffer is subsequently saved to disk, a hook function re-encodes the buffer before the actual disk write takes place.
This package recognizes all sorts of compressed files by a magic number at the beginning of these files but uses a heuristic to detect encrypted files. If you are asked for an encryption key for a file that is in fact not encrypted, just hit RET and the file will be accepted as is, and the crypt minor mode will not be entered.
Other types of encoding programs may be added to this package by using the
crypt-encoding-alist which contains a table of encoding
programs such as
gzip (GNU zip),
This new extended version of crypt now monitors the filename extensions of
buffers that are written out using
write-file (C-x C-w). If the
filename extension matches one of the extensions listed in
crypt-encoding-alist, then this package will write the file out using
the corresponding encoding (compression) method. This is done whether or not
the buffer originated from a previously encoded (compressed) file.
Thus, if the user is editing a file that may or may not have been encoded
originally (e.g., `foobar.Z' or `foobar') and decides to write it
to a different file (e.g., `barfoo' or `barfoo.z' or
`barfoo.C'). This package will examine the filename extension and write
the buffer in plain format or an alternate encoding (compression) format by
searching through the entries in the table of encoding methods
crypt-encoding-alist. This change in encoding state is done
automatically if the variable
crypt-auto-write-buffer is t otherwise
the user is asked.
To use this package, put the line
(require 'crypt) in your
initialization file. Do not bother trying to autoload this file; this
write-file hooks and thus should be
loaded the first time you visit any sort of file. Any package loaded after
this one that appends something to
write-file-hooks will not be
executed because this package writes out the file. Other packages that
write-file-hooks should either be modified to prepend to
that hook or be loaded before this one (preferably the former).
NOTE: encryption users should set
crypt-encryption-type to one of the
To configure this package, type:
M-x customize-group RET compression RET
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