[Libguestfs] Hivex3: Saving values - always string

[Martin Klíma]

Hello,

I attach example what I'm trying to do. In short I want to save binary 
values and I don't know how to encode them for hivex.


On 5.3.2014 16:02, Richard W.M. Jones wrote:
> On Wed, Mar 05, 2014 at 03:42:33PM +0100, Martin Klíma wrote:
>> Hello,
>>
>> thanks for answer, it works pretty good.
>>
>> I'm still little bit confused about saving binary values. I
>> understand that there can be risk, to write wrong sequence of bites
>> to hive but in regular MS Regedit this posibility is and when
>> someone really know what he does, it should be able to change bites
>> directly.
> The registry value has a binary field (with length) and a type byte.
> The type byte -- in theory -- tells you what is in the binary field,
> but actually nothing enforces that and real hives have all sorts of
> impossible / random type fields.
>
> So in hivex we don't try to interpret the type field, and recommend
> you use h.value_value and carefully check the data you get back.
>
>> So how achieve that with hivex? I noticed that hivex return binary
>> data in hex string, function   - "\xa5\xc6", but how to save this
>> data back? Should it be row binary string? "100001" or also some
>> string with specific coding? or hexadecimal values? I can't figure
>> it out...
> h.value_value returns the value as a binary.  You're probably printing
> it using a function that coverts it to hex.  h.node_set_value takes
> only binary data.
>
> If you post some working code showing precisely what you're trying to
> do, we can help further.
>
> Rich.
>

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