Re: [xml] Need help on normalization/canonicalization with namespace prefix rewrite

[Mikhail Goloborodko]

Hi Alexey,

I'm trying to get canonicalized xml (not according to standard) text to
sign it.
I need to rewrite namespace prefixes for that.
I modified c14n.c to meet my certain requirements - it is suitable for my
particular rules.
I included examples of xml i need in my previous emails.
So I hardcoded my namespace prefixes so it works for this case.
Would appretiate if somebody advise on how to achive that with no code
change.

Regards,
Mikhail

On Mon, Jan 29, 2018 at 10:44 PM, Aleksey Sanin  wrote:

> I don't understand what are you trying to do so I really don't have
> a good answer for you.
>
> Aleksey
>
> On 1/29/18 12:33 AM, Mikhail Goloborodko wrote:
> > Alexey,
> >
> > Thank you!
> > I'am new to libxml2. Would appretiate if you advice how to achieve this.
> > May be I need a callback for in Reader or Writer?
> >
> > Mikhail
> >
> > On Sun, Jan 28, 2018 at 10:02 PM, Aleksey Sanin  > > wrote:
> >
> > I am not sure what is the suggest algorithm to "rewrite namespace
> > prefixes". Regardless, this is not part of C14N spec and something
> > you will have to do yourself.
> >
> > Aleksey
> >
> > On 1/28/18 3:19 AM, Mikhail Goloborodko wrote:
> > > Hi All,
> > >
> > > I will appreciate if somebody could help on how to normalize and
> > > canonicalize XML.
> > >
> > > For example
> > > 
> > >  xmlns:ed="urn:ru:ed:v2.0">
> > > 
> > >
> > > I need to get
> > >
> > > 
> > >
> > > And for
> > >
> > > 
> > > 
> > >   
> > > 
> > >
> > > I need
> > >
> > >  attr="4583001999" > > attr="value">
> > >
> > > In other words I need to remove whitespaces and rewrite namespace
> > prefixes
> > > I use
> > > string src;
> > > xmlChar * canon;
> > > xmlDocPtr xDoc = xmlReadMemory(src.data(), src.size(), nullptr,
> > nullptr,
> > > XML_PARSE_NOBLANKS);
> > > int bytes = xmlC14NDocDumpMemory(xDoc, nullptr, 0, nullptr, 0, &
> > canon);
> > >
> > > It removes whitespaces, need help with namespace prefix rewrite.
> > >
> > > Thank you in advance.
> > >
> > > On Sun, Jan 28, 2018 at 12:41 AM, Mikhail Goloborodko
> > > mailto:mgoloboro...@gmail.com>
> > >>
> wrote:
> > >
> > > Hi,
> > >
> > > I need help on how to normalize and canonicalize XML.
> > > For example
> > > 
> > >  > xmlns:ed="urn:ru:ed:v2.0">
> > > 
> > >
> > > I need to get
> > >
> > > 
> > >
> > > And for
> > >
> > > 
> > > 
> > >   
> > > 
> > >
> > > I need
> > >
> > >  > > attr="value">
> > >
> > > In other words I need to remove whitespaces and rewrite
> namespace
> > > prefixes
> > > I use
> > > string src;
> > > xmlChar * canon;
> > > xmlDocPtr xDoc = xmlReadMemory(src.data(), src.size(), nullptr,
> > > nullptr, XML_PARSE_NOBLANKS);
> > > int bytes = xmlC14NDocDumpMemory(xDoc, nullptr, 0, nullptr, 0,
> > & canon);
> > >
> > > It clearly removes whitespace, need help with namespace prefix
> > rewrite.
> > >
> > > Thank you in advance.
> > >
> > > Mikhail
> > >
> > >
> > >
> > >
> > > ___
> > > xml mailing list, project page  http://xmlsoft.org/
> > > xml@gnome.org 
> > > https://mail.gnome.org/mailman/listinfo/xml
> > 
> > >
> >
> >
>
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Re: [xml] Need help on normalization/canonicalization with namespace prefix rewrite

[Mikhail Goloborodko]

Eric,

Thank you!
I modified some functions in c14n.c to meet my task.

Mikhail

On Mon, Jan 29, 2018 at 10:31 PM, Eric S. Eberhard  wrote:

> My experience is that many surprising companies don't do correct XML.
> Walmart for example does not put white space between attributes:
>
> attr1="value1"attr2="value2"
>
> I have one company that insists on one line (to CR or LF) for the entire
> XML (hard to read and debug).  Another won't take lines longer than 1024.
>
> Once can spend all decade trying to Fedex to change, Walmart to change,
> all year changing libxml2, etc.
>
> I went another way.  I have a pre and post filter on my XML that makes it
> as I want it.
>
> So when I get XML I run it through the pre-filter and change as needed
> (based on a libxml2 setup XML file!) and when I send it I run it through a
> post-filter and change as needed also based on libxml2 setup XML file.
>
> One can be "right" and waste more time than it is worth ... I dare anyone
> to try and "fix" Fedex or Walmart who insists they are correct ... or
> dozens of other companies.  It is easier to just fix it your self, and then
> process it.
>
> This also has the advantage that the processing code is "clean" -- since
> your input and output will be standard (whatever you chose) ... only the
> pre/post filters may need work.  Of course you need only filter the
> goofballs (99% of our stuff goes through as is).
>
> Another advantage is the pre/post filters don't have to use libxml2 at all
> (mine don't) -- read through them "by hand" with whatever language you use
> and you can change tags, namespaces, anything you like in any direction.
> Just make sure the result is valid!
>
> Just an idea but libxml2 cannot do everything for everyone -- especially
> when huge corporations do as they please.  It is a tool kit, not a complete
> car ... if you want to rebuild the engine, get the tools out, use them, and
> build your engine ... don't expect the tools to do everything.  Instead,
> just depend on them having all the tools which so far (as a user from way
> back when it was libxml.a) it has always worked and been reliable and fast.
>
> Eric
>
> On 1/28/2018 4:19 AM, Mikhail Goloborodko wrote:
>
> Hi All,
>
> I will appreciate if somebody could help on how to normalize and
> canonicalize XML.
>
> For example
> 
> 
> 
>
> I need to get
>
> 
>
> And for
>
> 
> 
>   
> 
>
> I need
>
>  attr="4583001999" attr="value">
>
> In other words I need to remove whitespaces and rewrite namespace prefixes
> I use
> string src;
> xmlChar * canon;
> xmlDocPtr xDoc = xmlReadMemory(src.data(), src.size(), nullptr, nullptr,
> XML_PARSE_NOBLANKS);
> int bytes = xmlC14NDocDumpMemory(xDoc, nullptr, 0, nullptr, 0, & canon);
>
> It removes whitespaces, need help with namespace prefix rewrite.
>
> Thank you in advance.
>
> On Sun, Jan 28, 2018 at 12:41 AM, Mikhail Goloborodko <
> mgoloboro...@gmail.com> wrote:
>
>> Hi,
>>
>> I need help on how to normalize and canonicalize XML.
>> For example
>> 
>> 
>> 
>>
>> I need to get
>>
>> 
>>
>> And for
>>
>> 
>> 
>>   
>> 
>>
>> I need
>>
>> > attr="value">
>>
>> In other words I need to remove whitespaces and rewrite namespace prefixes
>> I use
>> string src;
>> xmlChar * canon;
>> xmlDocPtr xDoc = xmlReadMemory(src.data(), src.size(), nullptr, nullptr,
>> XML_PARSE_NOBLANKS);
>> int bytes = xmlC14NDocDumpMemory(xDoc, nullptr, 0, nullptr, 0, & canon);
>>
>> It clearly removes whitespace, need help with namespace prefix rewrite.
>>
>> Thank you in advance.
>>
>> Mikhail
>>
>>
>
> ___
> xml mailing list, project page  
> http://xmlsoft.org/xml@gnome.orghttps://mail.gnome.org/mailman/listinfo/xml
>
>
> --
> Eric S. Eberhard
> VICS
> 2933 W Middle Verde Road
> Camp Verde, AZ  86322
>
> 928-567-3727  work  928-301-7537  cell
> http://www.vicsmba.com/index.html (our 
> work)http://www.vicsmba.com/ourpics/index.html (fun pictures)
>
>
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Re: [xml] Need help on normalization/canonicalization with namespace prefix rewrite

[Aleksey Sanin]

I don't understand what are you trying to do so I really don't have
a good answer for you.

Aleksey

On 1/29/18 12:33 AM, Mikhail Goloborodko wrote:
> Alexey,
> 
> Thank you!
> I'am new to libxml2. Would appretiate if you advice how to achieve this.
> May be I need a callback for in Reader or Writer?
> 
> Mikhail
> 
> On Sun, Jan 28, 2018 at 10:02 PM, Aleksey Sanin  > wrote:
> 
> I am not sure what is the suggest algorithm to "rewrite namespace
> prefixes". Regardless, this is not part of C14N spec and something
> you will have to do yourself.
> 
> Aleksey
> 
> On 1/28/18 3:19 AM, Mikhail Goloborodko wrote:
> > Hi All,
> >
> > I will appreciate if somebody could help on how to normalize and
> > canonicalize XML.
> >
> > For example
> > 
> > 
> > 
> >
> > I need to get
> >
> > 
> >
> > And for
> >
> > 
> > 
> >   
> > 
> >
> > I need
> >
> >  attr="4583001999" > attr="value">
> >
> > In other words I need to remove whitespaces and rewrite namespace
> prefixes
> > I use
> > string src;
> > xmlChar * canon;
> > xmlDocPtr xDoc = xmlReadMemory(src.data(), src.size(), nullptr,
> nullptr,
> > XML_PARSE_NOBLANKS);
> > int bytes = xmlC14NDocDumpMemory(xDoc, nullptr, 0, nullptr, 0, &
> canon);
> >
> > It removes whitespaces, need help with namespace prefix rewrite.
> >
> > Thank you in advance.
> >
> > On Sun, Jan 28, 2018 at 12:41 AM, Mikhail Goloborodko
> > mailto:mgoloboro...@gmail.com>
> >> wrote:
> >
> >     Hi,
> >
> >     I need help on how to normalize and canonicalize XML.
> >     For example
> >     
> >      xmlns:ed="urn:ru:ed:v2.0">
> >     
> >
> >     I need to get
> >
> >     
> >
> >     And for
> >
> >     
> >     
> >       
> >     
> >
> >     I need
> >
> >      >     attr="value">
> >
> >     In other words I need to remove whitespaces and rewrite namespace
> >     prefixes
> >     I use
> >     string src;
> >     xmlChar * canon;
> >     xmlDocPtr xDoc = xmlReadMemory(src.data(), src.size(), nullptr,
> >     nullptr, XML_PARSE_NOBLANKS);
> >     int bytes = xmlC14NDocDumpMemory(xDoc, nullptr, 0, nullptr, 0,
> & canon);
> >
> >     It clearly removes whitespace, need help with namespace prefix
> rewrite.
> >
> >     Thank you in advance.
> >
> >     Mikhail 
> >
> >
> >
> >
> > ___
> > xml mailing list, project page  http://xmlsoft.org/
> > xml@gnome.org 
> > https://mail.gnome.org/mailman/listinfo/xml
> 
> >
> 
> 
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Re: [xml] Need help on normalization/canonicalization with namespace prefix rewrite

[Mikhail Goloborodko]

Alexey,

Thank you!
I'am new to libxml2. Would appretiate if you advice how to achieve this.
May be I need a callback for in Reader or Writer?

Mikhail

On Sun, Jan 28, 2018 at 10:02 PM, Aleksey Sanin  wrote:

> I am not sure what is the suggest algorithm to "rewrite namespace
> prefixes". Regardless, this is not part of C14N spec and something
> you will have to do yourself.
>
> Aleksey
>
> On 1/28/18 3:19 AM, Mikhail Goloborodko wrote:
> > Hi All,
> >
> > I will appreciate if somebody could help on how to normalize and
> > canonicalize XML.
> >
> > For example
> > 
> > 
> > 
> >
> > I need to get
> >
> > 
> >
> > And for
> >
> > 
> > 
> >   
> > 
> >
> > I need
> >
> >  attr="4583001999" > attr="value">
> >
> > In other words I need to remove whitespaces and rewrite namespace
> prefixes
> > I use
> > string src;
> > xmlChar * canon;
> > xmlDocPtr xDoc = xmlReadMemory(src.data(), src.size(), nullptr, nullptr,
> > XML_PARSE_NOBLANKS);
> > int bytes = xmlC14NDocDumpMemory(xDoc, nullptr, 0, nullptr, 0, & canon);
> >
> > It removes whitespaces, need help with namespace prefix rewrite.
> >
> > Thank you in advance.
> >
> > On Sun, Jan 28, 2018 at 12:41 AM, Mikhail Goloborodko
> > mailto:mgoloboro...@gmail.com>> wrote:
> >
> > Hi,
> >
> > I need help on how to normalize and canonicalize XML.
> > For example
> > 
> > 
> > 
> >
> > I need to get
> >
> > 
> >
> > And for
> >
> > 
> > 
> >   
> > 
> >
> > I need
> >
> >  > attr="value">
> >
> > In other words I need to remove whitespaces and rewrite namespace
> > prefixes
> > I use
> > string src;
> > xmlChar * canon;
> > xmlDocPtr xDoc = xmlReadMemory(src.data(), src.size(), nullptr,
> > nullptr, XML_PARSE_NOBLANKS);
> > int bytes = xmlC14NDocDumpMemory(xDoc, nullptr, 0, nullptr, 0, &
> canon);
> >
> > It clearly removes whitespace, need help with namespace prefix
> rewrite.
> >
> > Thank you in advance.
> >
> > Mikhail
> >
> >
> >
> >
> > ___
> > xml mailing list, project page  http://xmlsoft.org/
> > xml@gnome.org
> > https://mail.gnome.org/mailman/listinfo/xml
> >
>
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Re: [xml] Need help on normalization/canonicalization with namespace prefix rewrite

[Aleksey Sanin]

I am not sure what is the suggest algorithm to "rewrite namespace
prefixes". Regardless, this is not part of C14N spec and something
you will have to do yourself.

Aleksey

On 1/28/18 3:19 AM, Mikhail Goloborodko wrote:
> Hi All,
> 
> I will appreciate if somebody could help on how to normalize and
> canonicalize XML.
> 
> For example
> 
> 
> 
> 
> I need to get
> 
> 
> 
> And for
> 
> 
> 
>   
> 
> 
> I need
> 
>  attr="4583001999" attr="value">
> 
> In other words I need to remove whitespaces and rewrite namespace prefixes
> I use
> string src;
> xmlChar * canon;
> xmlDocPtr xDoc = xmlReadMemory(src.data(), src.size(), nullptr, nullptr,
> XML_PARSE_NOBLANKS);
> int bytes = xmlC14NDocDumpMemory(xDoc, nullptr, 0, nullptr, 0, & canon);
> 
> It removes whitespaces, need help with namespace prefix rewrite.
> 
> Thank you in advance.
> 
> On Sun, Jan 28, 2018 at 12:41 AM, Mikhail Goloborodko
> mailto:mgoloboro...@gmail.com>> wrote:
> 
> Hi,
> 
> I need help on how to normalize and canonicalize XML.
> For example
> 
> 
> 
> 
> I need to get
> 
> 
> 
> And for
> 
> 
> 
>   
> 
> 
> I need
> 
>  attr="value">
> 
> In other words I need to remove whitespaces and rewrite namespace
> prefixes
> I use
> string src;
> xmlChar * canon;
> xmlDocPtr xDoc = xmlReadMemory(src.data(), src.size(), nullptr,
> nullptr, XML_PARSE_NOBLANKS);
> int bytes = xmlC14NDocDumpMemory(xDoc, nullptr, 0, nullptr, 0, & canon);
> 
> It clearly removes whitespace, need help with namespace prefix rewrite.
> 
> Thank you in advance.
> 
> Mikhail 
> 
> 
> 
> 
> ___
> xml mailing list, project page  http://xmlsoft.org/
> xml@gnome.org
> https://mail.gnome.org/mailman/listinfo/xml
> 
___
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