Re: [naviserver-devel] Re: [naviserver-commits] naviserver/nsd tclobjv.c,1.7,1.8 tclresp.c,1.4,1.5

[Vlad S. <vl...@cr...>]

This is i missed, never thought it is available

Stephen Deasey wrote:
> Tcl_ObjType byteArrayType = Tcl_GetObjType("bytearray");
> 
> 
> On 6/10/05, Vlad Seryakov <vl...@cr...> wrote:
> 
>>The problem is, there is no Public API to check object for ByteArray
>>type. You have to include tclInt.h for this which is not public.
>>
>>Stephen Deasey wrote:
>>
>>>On 6/10/05, Vlad Seryakov <vl...@cr...> wrote:
>>>
>>>
>>>>I thought about ns_return -binary as well. first -binary flag is
>>>>optional so it will be compatible with the old API. Let me try this.
>>>>
>>>>Zoran Vasiljevic wrote:
>>>>
>>>>
>>>>>Am 10.06.2005 um 15:41 schrieb Vlad Seryakov:
>>>>>
>>>>>
>>>>>
>>>>>>* Tcl_GetByteArrayFromObj --
>>>>>>*
>>>>>>*      Attempt to get the array of bytes from the Tcl object.  If the
>>>>>>*      object is not already a ByteArray object, an attempt will be
>>>>>>*      made to convert it to one.
>>>>>>
>>>>>>So, if i call ns_return from Tcl and pass data parameter, it will  be
>>>>>>always type of String. ByteArrays are created from Tcl by binary
>>>>>>command only, other commands work with String types, so i need to
>>>>>>tell ns_return to treat data as bytearray. Tcl string
>>>>>>can contain binary data but it is still String and that check will
>>>>>>never work for binary data.
>>>>>>
>>>>>
>>>>>I'm afraid you are right. I also have my own (binary-aware) ns_return
>>>>>somewhere
>>>>>in my toolbox but never thought it would be of general interest.
>>>>>
>>>>>OTOH, the "ns_return -binary" would look nicer but I do not
>>>>>know if we'd be backwardly-compatible (guess not).
>>>
>>>
>>>
>>>The *only* thing a Tcl string can contain is valid UTF8.  If you're
>>>putting something other than UTF8 in there, you've got big problems...
>>>
>>>Now, sending a UTF8 string directly to the client as a bytearray is
>>>effectively the same as sedinding it in the UTF8 encoding, i.e. the
>>>client will recieve exactly what was in memory for that string,
>>>because no transcoding to some other character set will be occur.
>>>There is API for setting the encoding on a per connection basis.
>>>
>>>The only way to pass a buffer of arbitrary (non-UTF8) bytes to a
>>>command is as a bytearray object.  You can create these with the
>>>[binary] command, by opening a file with -translation binary, or from
>>>some extension such as the image example I gave above.  That being the
>>>case, you should be able to check the type of the object given to
>>>ns_return, and act accordingly
>>>
>>>It's for these reasons that ns_returnbinary and ns_return -binary are
>>>fundamentaly broken.
>>>
>>>
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>>
>>--
>>Vlad Seryakov
>>571 262-8608 office
>>vl...@cr...
>>http://www.crystalballinc.com/vlad/
>>
>>
>>-------------------------------------------------------
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> 
> 
> 
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-- 
Vlad Seryakov
571 262-8608 office
vl...@cr...
http://www.crystalballinc.com/vlad/