[Gnash-commit] [bug #47280] Gnash's ExternalInterface does not return Number value correctly

[Nutchanon Wetchasit]

Follow-up Comment #4, bug #47280 (project gnash):

The precision problem on Flash-calls-JavaScript return value boils down to
how
libgnashplugin marshall floating point number data
<http://git.savannah.gnu.org/cgit/gnash.git/tree/plugin/npapi/external.cpp?id=c12c3cf104a095cff9791cdb3cee8bbf4853d5e0#n361>:

    if (NPVARIANT_IS_DOUBLE(*value)) {
        double num = NPVARIANT_TO_DOUBLE(*value);
        ss << "<number>" << num << "</number>";
    } else if (NPVARIANT_IS_STRING(*value)) {


This causes precision loss as iostream used only few decimal digits when
printing `double` type to the stream. (To losslessly represent the number,
17 decimal significands were required)

Gnash: 0.8.11dev (git c12c3cf 22-Feb-2016)
System: Debian GNU/Linux 7.0 Wheezy i386

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