Improve out-of-memory handling

[firepick1]

Benoit, I made a few tweaks in my branch to handle several out-of-memory edge cases that were blowing up my code. You might be interested in this:
firepick1@bc8c3d9

[bblanchon]

What happened before you added the changes?
It should be 100% safe to manipulate invalid JsonVariant, JsonArray and JsonObject, every operation should be nops.

[bblanchon]

PS: Do you think you can write a unit test?

[firepick1]

I've got a unit test in my code that fails without these changes. I'll try
to add one in ArduinoJson.

It was failing on something like this:
StaticJsonBuffer<JSON_OBJECT_SIZE(4)> jbtiny;
{"a":{"b":{"c":{"d":123}}}

jbtiny.parseObject() returns success.
However, a printTo() of the parsed JSON yields:
{"a":{"b":{"c":{}}

I knew that your intent was to make the invariants mutable, but I couldn't
figure out why this particular case broke, so after getting a headache I
slapped a goto bandaid on it and it seemed to work.

On Sun, Apr 26, 2015 at 7:49 AM, Benoît Blanchon notifications@github.com
wrote:

PS: Do you think you can write a unit test?

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#68 (comment)
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Karl Lew
FIREPICK SERVICES LLC
karl@firepick.org
www.firepick.org

[bblanchon]

Excellent!
I'll fix this ASAP.

[firepick1]

Cool. Thanks! I was trying to figure out the unit tests and that would take
some time.

On Sun, Apr 26, 2015 at 8:08 AM, Benoît Blanchon notifications@github.com
wrote:

Excellent!
I'll fix this ASAP.

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#68 (comment)
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Karl Lew
FIREPICK SERVICES LLC
karl@firepick.org
www.firepick.org

[bblanchon]

I fixed the bug in a completely different way.
Please have a look at branch issue68.
I'll merge into master ASAP.

[firepick1]

Thanks, Benoit!

Your fix feels much better than my bandaid. :D

On Sun, Apr 26, 2015 at 11:01 AM, Benoît Blanchon notifications@github.com
wrote:

I fixed the bug in a completely different way.
Please have a look at branch issue68
https://github.com/bblanchon/ArduinoJson/commits/issue68.
I'll merge into master ASAP.

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#68 (comment)
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Karl Lew
FIREPICK SERVICES LLC
karl@firepick.org
www.firepick.org