[Expat-discuss] Using XML_GetBuffer/XML_ParseBuffer

[James Whetstone]

So I found the easiest and maybe the best way to prevent additional memory 
allocations is to initially create a buffer that is double the size of the 
TCP input buffer.  For example,  I create a buffer using 
XML_GetBuffer(parser, 8192) and then code the rest of the program as if the 
buffer is 4096 bytes.  So subsequent calls to XML_GetBuffer are called with 
a buffer size of 4096.

---James


----- Original Message ----- 
From: "James Whetstone" <jameswhetstone at comcast.net>
To: "Karl Waclawek" <karl at waclawek.net>
Cc: <expat-discuss at libexpat.org>
Sent: Saturday, September 23, 2006 2:58 PM
Subject: Re: [Expat-discuss] Using XML_GetBuffer/XML_ParseBuffer


> So I stepped through the code to see what happens to unused fragments, and
> it leaves the fragments in the buffer.  From what I can tell, instead of
> moving the offset of the input buffer, XML_GetBuffer is intended to be
> called each time new input is to be accepted.  It then allocates a new
> (larger) buffer, memcpys the fragment from the old buffer to the new 
> buffer
> and then frees the old buffer.  I'd like to avoid this by simple moving 
> the
> input buffer's offset to the a end of the fragment and NOT calling
> XML_GetBuffer to avoid the extran memory allocation.  Any suggestions?
>
> ---James
>
> ----- Original Message ----- 
> From: "Karl Waclawek" <karl at waclawek.net>
> To: "James Whetstone" <jameswhetstone at comcast.net>
> Cc: <expat-discuss at libexpat.org>
> Sent: Saturday, September 23, 2006 1:29 PM
> Subject: Re: [Expat-discuss] Using XML_GetBuffer/XML_ParseBuffer
>
>
>> James Whetstone wrote:
>>> Another question along the same lines is whether or not I even need to
>>> worry about overwriting left over data in the XML Buffer.  I assumed
>>> there would sometimes be some left over data of a XML fragment in the
>>> buffer, but maybe that isn't the case.
>>>
>>>
>> If I remember correctly, Expat buffers any unused fragments. So you 
>> should
>> not have to worry.
>>
>> Karl
>
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