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由 Matt Caswell 提交于
WPACKET_allocate_bytes() requires you to know the size of the data you are allocating for, before you create it. Sometimes this isn't the case, for example we know the maximum size that a signature will be before we create it, but not the actual size. WPACKET_reserve_bytes() enables us to reserve bytes in the WPACKET, but not count them as written yet. We then subsequently need to acall WPACKET_allocate_bytes to actually count them as written. Reviewed-by: NRich Salz <rsalz@openssl.org>
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