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Cygwin for example does not support qsort_r.
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Otherwise, array->esize is promoted to int and if array->esize * num
results in a value > 0x7fffffff the return value would be incorrect due
the implicit sign extension when getting cast to size_t.
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Partially based on an old patch by Adrian-Ken Rueegsegger.
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This required some refactoring when handling encrypted payloads.
Also changed log messages so that "encrypted payload" is logged instead
of "encryption payload" (even if we internally still call it that) as
that's the name used in RFC 5996.
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Its functionality can be replicated by calling insert_before() followed
by remove_at(). Not the other way around, though, because remove_at()
changes the enumerator position.
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Currently we use the very versatile linked-list collection to store elements
with variable count. This is fine, but very inefficient: Due to the many
methods in the linked list, on 64-bit platforms an empty list alone is more
than 200 bytes. As we currently have about 50 lists per IKE_SA/CHILD_SA pair,
this takes up to 10KB just for managing the empty lists. This is about the
half of memory used by an IKE_SA/CHILD_SA pair, and obviously way too much.
The new array type is not an object, but a collection of functions on an
abstract type.
The following lists are per IKE_SA and should be considered for a replacement
with more efficient arrays (this uses load-testers on-demand created dynamic
configurations, other scenarios have different lists):
14 -> ike_sa_create() @ src/libcharon/sa/ike_sa.c:2198
10 -> auth_cfg_create() @ src/libstrongswan/credentials/auth_cfg.c:1088
6 -> task_manager_v2_create() @ src/libcharon/sa/ikev2/task_manager_v2.c:1505
6 -> proposal_create() @ src/libcharon/config/proposal.c:592
5 -> peer_cfg_create() @ src/libcharon/config/peer_cfg.c:657
4 -> child_sa_create() @ src/libcharon/sa/child_sa.c:1090
2 -> child_cfg_create() @ src/libcharon/config/child_cfg.c:536
1 -> ike_cfg_create() @ src/libcharon/config/ike_cfg.c:330
1 -> put_connected_peers() @ src/libcharon/sa/ike_sa_manager.c:854
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Since we always search for the nearest separator (and strip them from
the front of the next token) there can't be any separators left at the
end of a token.
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