Guard PacketFieldHandle index against uint16_t overflow - #124
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PacketFieldHandle packs its index into 16 bits, but GetOrCreatePacketFieldHandle had no check that field_names_.size() still fits, so interning more than 2^16 distinct field names would silently truncate the index and alias two different field names onto the same handle. Add an explicit CHECK and a regression test. Fixes google#123
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PacketFieldHandle packs its index into 16 bits, but GetOrCreatePacketFieldHandle had no check that field_names_.size() still fits, so interning more than 2^16 distinct field names would silently truncate the index and alias two different field names onto the same handle. Add an explicit CHECK and a regression test.
Fixes #123