[issue32978] Issues with reading large float values in AIFC files

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> But I don't know the exact format for infinities and NaNs.

>From the Intel software developer manuals:

For infinities:

Sign bit: 0 or 1 (positive or negative infinity)
Exponent field (15 bits): all ones
Significand (64 bits): first bit 1, all remaining bits 0.

NaN:

Sign bit: 0 or 1
Exponent field (15 bits): all ones
Significand (64 bits): first bit 1, at least one of the remaining bits 1.

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<https://bugs.python.org/issue32978>
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