Hello.
When using HTTP-REQUEST for non text content types, we have following error in CLISP:
SYSTEM::STORE: #< does not fit into #(0 0 0 0 0 0 0 0 0 0 ...), bad type
Backtrace: 0: INVOKE-DEBUGGER 1: SYSTEM::STORE 2: EXT:READ-CHAR-SEQUENCE 3: READ-SEQUENCE 4: DRAKMA::READ-BODY 5: DRAKMA::HTTP-REQUEST-FINISH-REQUEST 6: unwind-protect frame 7: compiled block frame for HTTP-REQUEST 8: HTTP-REQUEST
This is because CLISP doesn't support READ-SEQUENCE on a stream having STREAM-ELEMENT-TYPE == 'CHARACTER.
The patch attached fixes this problem by explicit change of stream element type in the DRAKMA::READ-BODY function.
Test URLs: http://www.google.com/calendar/feeds/pm55j8kg30dnm54ib2if9fuocc@group.calend... http://www.lisperati.com/lisplogo_alien_128.png
Best regards, -- Anton
On Sat, 22 Mar 2008 00:12:26 +0200, Anton Vodonosov avodonosov@yandex.ru wrote:
This is because CLISP doesn't support READ-SEQUENCE on a stream having STREAM-ELEMENT-TYPE == 'CHARACTER.
Isn't that a bug which should be reported to the CLISP maintainers?
The patch attached fixes this problem by explicit change of stream element type in the DRAKMA::READ-BODY function.
Thanks. Applied.
On Sat, 22 Mar 2008 0:42:37 Edi Weitz wrote:
On Sat, 22 Mar 2008 00:12:26 +0200, Anton Vodonosov avodonosov@yandex.ru wrote:
This is because CLISP doesn't support READ-SEQUENCE on a stream having STREAM-ELEMENT-TYPE == 'CHARACTER.
Isn't that a bug which should be reported to the CLISP maintainers?
Strictly speaking it's not a bug. CLHS even says that READ-SEQUENCE "Might signal an error of type type-error if an element read from the stream is not a member of the element type of the sequence."
For WRITE-STREAM event worse, it explicitly mention stream element type: "Might signal an error of type type-error if an element of the bounded sequence is not a member of the stream element type of the stream."
Drakma relies on FLEXI-STREAMS in hope that FLEXI-STREAMS:STREAM-READ-SEQUENCE will handle it gracefully, but the problem is that it is not called at all. Function STREAM-READ-SEQUENCE is not included into Gray streams proposal (I guess because READ-SEQUENCE itself wasn't part of the standard draft at the time when the proposal was made, at least it's absent in CLTL2).
trivial-gray-streams tries to emulate STREAM-READ-SEQUENCE based on more limited CLISP's STREAM-READ-BYTE-SEQUENCE, but this doesn't work in all situations.
From my personal point of view it would be better to just implement
generic STREAM-READ-SEQUENCE in CLISP, as it is done in most of other CL implementations; I event suggested a patch (which is trivial). But CLISP maintainers weren't too enthusiastic about that. Maybe I must pressurize them, to the coming generations good.
Regards, -- Anton
On Sat, 22 Mar 2008 01:31:55 +0200, Anton Vodonosov avodonosov@yandex.ru wrote:
From my personal point of view it would be better to just implement generic STREAM-READ-SEQUENCE in CLISP, as it is done in most of other CL implementations;
Right, I agree.
I event suggested a patch (which is trivial). But CLISP maintainers weren't too enthusiastic about that.
Hmmm...
"Anton Vodonosov" avodonosov@yandex.ru wrote in message news:1778416840.20080322001226@yandex.ru...
Hello.
When using HTTP-REQUEST for non text content types, we have following error in CLISP:
SYSTEM::STORE: #< does not fit into #(0 0 0 0 0 0 0 0 0 0 ...), bad
type
[snipped Backtrace]
This is because CLISP doesn't support READ-SEQUENCE on a stream having STREAM-ELEMENT-TYPE == 'CHARACTER.
The patch attached fixes this problem by explicit change of stream element type in the DRAKMA::READ-BODY function.
That's odd, I've been using clisp + drakma for months on streams which are a mixture of ASCII and binary without problems. /me checks something.
Aha! I took a somewhat longer approach and mucked around with system::read-sequence and system::write-sequence to prefer byte-sequences over character-sequences (see attached). Never made a patch to CLISP because I figured it wasn't the right solution so much as something that happens to work for my particular application.
I like your way better! :)
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Pixel wrote:
Aha! I took a somewhat longer approach and mucked around with system::read-sequence and system::write-sequence to prefer byte-sequences over character-sequences (see attached).
Good idea. I wasn't aware that it is possible to redefine system functions. At first sight this way it may be possible to fix trivial-gray-stream so that trivial-gray-streams:stream-read-sequence will always be called by cl:read-sequence and therefore eliminate all #+clisp in all trivial-gray-streams depended libraries.
Hello.
Good news, CLISP CVS now has GRAY:STREAM-READ-SEQUENCE and GRAY:STREAM-WRITE-SEQUENCE. http://sourceforge.net/mailarchive/forum.php?thread_name=47E6C701.6030004%40...
Only small update of trivial-gray-streams remains to be done.
-Anton
On Sun, 23 Mar 2008 23:53:19 +0200, Anton Vodonosov avodonosov@yandex.ru wrote:
and GRAY:STREAM-WRITE-SEQUENCE.
Nice, thanks.
-
Anton Vodonosov -
Edi Weitz -
Pixel // pinterface