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ad84ef5a9a
Port the four manifest containment changes shipped in rippled 3.2.1 (587505ef18, 32a9cc4038, 0cce5a06d9, and 4bd1d1ca2f) to Xahau without additional behavioral changes.\n\nBound untrusted cache residency and per-message work, preserve trusted/configured/DB exemptions, reject oversized manifests before decoding, and soft-discard oversized manifest frames for compatibility.
Basics
Utility functions and classes.
ripple/basic should contain no dependencies on other modules.
Choosing a rippled container.
-
std::vector- For ordered containers with most insertions or erases at the end.
-
std::deque- For ordered containers with most insertions or erases at the start or end.
-
std::list- For ordered containers with inserts and erases to the middle.
- For containers with iterators stable over insert and erase.
- Generally slower and bigger than
std::vectororstd::dequeexcept for those cases.
-
std::set- For sorted containers.
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ripple::hash_set- Where inserts and contains need to be O(1).
- For "small" sets,
std::setmight be faster and smaller.
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ripple::hardened_hash_set- For data sets where the key could be manipulated by an attacker in an attempt to mount an algorithmic complexity attack: see http://en.wikipedia.org/wiki/Algorithmic_complexity_attack
The following container is deprecated
std::unordered_set- Use
ripple::hash_setinstead, which uses a better hashing algorithm. - Or use
ripple::hardened_hash_setto prevent algorithmic complexity attacks.