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refactor: in sendPex(), reuse the temporary buffer (#3568)

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Charles Kerr 2022-08-02 18:35:16 -05:00 committed by GitHub
parent f39826cc59
commit df7a44adb2
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1 changed files with 32 additions and 26 deletions
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58
libtransmission/peer-msgs.cc
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@ -2505,8 +2505,6 @@ static void sendPex(tr_peerMsgsImpl* msgs)
return;
}
uint8_t* tmp = nullptr;
uint8_t* walk = nullptr;
evbuffer* const out = msgs->outMessages;
// update msgs
@ -2517,10 +2515,14 @@ static void sendPex(tr_peerMsgsImpl* msgs)
auto val = tr_variant{};
tr_variantInitDict(&val, 3); /* ipv6 support: left as 3: speed vs. likelihood? */
auto tmpbuf = std::vector<uint8_t>{};
if (!std::empty(added))
{
// "added"
tmp = walk = tr_new(uint8_t, std::size(added) * 6U);
tmpbuf.resize(std::size(added) * 6U);
auto* begin = std::data(tmpbuf);
auto* walk = begin;
for (auto const& p : added)
{
memcpy(walk, &p.addr.addr, 4U);
@ -2529,27 +2531,29 @@ static void sendPex(tr_peerMsgsImpl* msgs)
walk += 2U;
}
TR_ASSERT(static_cast<size_t>(walk - tmp) == std::size(added) * 6U);
tr_variantDictAddRaw(&val, TR_KEY_added, tmp, walk - tmp);
tr_free(tmp);
TR_ASSERT(static_cast<size_t>(walk - begin) == std::size(added) * 6U);
tr_variantDictAddRaw(&val, TR_KEY_added, begin, walk - begin);
// "added.f"
// unset each holepunch flag because we don't support it.
tmp = walk = tr_new(uint8_t, std::size(added));
tmpbuf.resize(std::size(added));
begin = std::data(tmpbuf);
walk = begin;
for (auto const& p : added)
{
*walk++ = p.flags & ~ADDED_F_HOLEPUNCH;
}
TR_ASSERT(static_cast<size_t>(walk - tmp) == std::size(added));
tr_variantDictAddRaw(&val, TR_KEY_added_f, tmp, walk - tmp);
tr_free(tmp);
TR_ASSERT(static_cast<size_t>(walk - begin) == std::size(added));
tr_variantDictAddRaw(&val, TR_KEY_added_f, begin, walk - begin);
}
if (!std::empty(dropped))
{
// "dropped"
tmp = walk = tr_new(uint8_t, std::size(dropped) * 6U);
tmpbuf.resize(std::size(dropped) * 6U);
auto* begin = std::data(tmpbuf);
auto* walk = begin;
for (auto const& p : dropped)
{
memcpy(walk, &p.addr.addr, 4U);
@ -2558,15 +2562,16 @@ static void sendPex(tr_peerMsgsImpl* msgs)
walk += 2U;
}
TR_ASSERT(static_cast<size_t>(walk - tmp) == std::size(dropped) * 6U);
tr_variantDictAddRaw(&val, TR_KEY_dropped, tmp, walk - tmp);
tr_free(tmp);
TR_ASSERT(static_cast<size_t>(walk - begin) == std::size(dropped) * 6U);
tr_variantDictAddRaw(&val, TR_KEY_dropped, begin, walk - begin);
}
if (!std::empty(added6))
{
// "added6"
tmp = walk = tr_new(uint8_t, std::size(added6) * 18U);
tmpbuf.resize(std::size(added6) * 18U);
auto* begin = std::data(tmpbuf);
auto* walk = begin;
for (auto const& p : added6)
{
memcpy(walk, &p.addr.addr.addr6.s6_addr, 16U);
@ -2575,27 +2580,29 @@ static void sendPex(tr_peerMsgsImpl* msgs)
walk += 2U;
}
TR_ASSERT(static_cast<size_t>(walk - tmp) == std::size(added6) * 18U);
tr_variantDictAddRaw(&val, TR_KEY_added6, tmp, walk - tmp);
tr_free(tmp);
TR_ASSERT(static_cast<size_t>(walk - begin) == std::size(added6) * 18U);
tr_variantDictAddRaw(&val, TR_KEY_added6, begin, walk - begin);
// "added6.f"
// unset each holepunch flag because we don't support it.
tmp = walk = tr_new(uint8_t, std::size(added6));
tmpbuf.resize(std::size(added6));
begin = std::data(tmpbuf);
walk = begin;
for (auto const& p : added6)
{
*walk++ = p.flags & ~ADDED_F_HOLEPUNCH;
}
TR_ASSERT(static_cast<size_t>(walk - tmp) == std::size(added6));
tr_variantDictAddRaw(&val, TR_KEY_added6_f, tmp, walk - tmp);
tr_free(tmp);
TR_ASSERT(static_cast<size_t>(walk - begin) == std::size(added6));
tr_variantDictAddRaw(&val, TR_KEY_added6_f, begin, walk - begin);
}
if (!std::empty(dropped6))
{
// "dropped6"
tmp = walk = tr_new(uint8_t, std::size(dropped6) * 18U);
tmpbuf.resize(std::size(dropped6) * 18U);
auto* const begin = std::data(tmpbuf);
auto* walk = begin;
for (auto const& p : dropped6)
{
memcpy(walk, &p.addr.addr.addr6.s6_addr, 16U);
@ -2604,9 +2611,8 @@ static void sendPex(tr_peerMsgsImpl* msgs)
walk += 2U;
}
TR_ASSERT(static_cast<size_t>(walk - tmp) == std::size(dropped6) * 18U);
tr_variantDictAddRaw(&val, TR_KEY_dropped6, tmp, walk - tmp);
tr_free(tmp);
TR_ASSERT(static_cast<size_t>(walk - begin) == std::size(dropped6) * 18U);
tr_variantDictAddRaw(&val, TR_KEY_dropped6, begin, walk - begin);
}
/* write the pex message */