b379e44dfb
This refactor is driven by the following (ultimate) aims: - Get rid of as much of the custom stream code in mime4cl which makes less code to maintain in the future. - Lay the groundwork for correct handling of 8bit transfer encoding: The mime4cl we inherited assumes that any MIME message can be decoded completely by the CL implementation (in SBCL's case using latin1) into CHARACTERs. This is not necessarily the case. flexi-streams allows changing how the stream is decoded on the fly and also has support for reading the underlying bytes which is perfect for the requirements decoding MIME has. - Since flexi-streams uses trivial-gray-streams, it supports READ-SEQUENCE. Taking advantage of this may improve decoding performance significantly in the future. This incurs the following changes: - Naturally we now open given files as binary files in MIME-MESSAGE. Given strings are encoded using STRING-TO-OCTETS and then passed on to a new octet vector method. Instead of MY-STRING-INPUT-STREAM this now uses flexi-streams' WITH-INPUT-FROM-SEQUENCE. - OPEN-FILE-PORTION and OPEN-DECODED-FILE-PORTION need to be merged, since the transfer encoding not only implies an extra decoder stream that needs to be attached after file portion stream, but also imply a certain encoding of the stream itself (mostly binary vs. ASCII). As flexi-streams can change their encoding on the fly this could be untangled again, but it is not strictly necessary. As before, we use the DATA slot of the file portion to create a fresh stream if possible. Instead of strings we now use an vector of octets to match MIME-MESSAGE. The actual portioned stream relies on POSITIONED-FLEXI-INPUT-STREAM, a subclass of the stock FLEXI-INPUT-STREAM class, described below. - POSITIONED-FLEXI-INPUT-STREAM replaces DELIMITED-INPUT-STREAM. It is created using MAKE-POSITIONED-FLEXI-INPUT-STREAM which accepts the same arguments as MAKE-FLEXI-STREAMS and, additionally, :IGNORE-CLOSE. A POSITIONED-FLEXI-INPUT-STREAM works the same as an FLEXI-INPUT-STREAM, but upon creation, the underlying stream is rewinded or forwarded to the argument given by :POSITION using FILE-POSITION. If :IGNORE-CLOSE is T, a call to CLOSE is not forwarded to the underlying stream. Change-Id: I2d48c769bb110ca0b7cf52441bd63c1e1c2ccd04 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8559 Reviewed-by: sterni <sternenseemann@systemli.org> Autosubmit: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI |
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| .. | ||
| test | ||
| .skip-subtree | ||
| address.lisp | ||
| default.nix | ||
| endec.lisp | ||
| ex-sclf.lisp | ||
| mime.lisp | ||
| mime4cl-tests.asd | ||
| mime4cl.asd | ||
| OWNERS | ||
| package.lisp | ||
| README | ||
| streams.lisp | ||
MIME4CL is a Common Lisp library for dealing with MIME messages. It has originally been written by Walter C. Pelissero and vendored into depot as upstream has become inactive and provides no repo of any kind. Upstream and depot version may diverge. Upstream Website: http://wcp.sdf-eu.org/software/#mime4cl Vendored Tarball: http://wcp.sdf-eu.org/software/mime4cl-20150207T211851.tbz