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net: Add trim_back to packet

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This commit is contained in:
Asias He
2014-11-04 14:52:10 +08:00
committed by Avi Kivity
parent 52f2a2b35b
commit 345d3a3628
1 changed files with 18 additions and 0 deletions
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18
net/packet.hh
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@@ -213,6 +213,7 @@ public:
void append(packet&& p);
void trim_front(size_t how_much);
void trim_back(size_t how_much);
// get a header pointer, linearizing if necessary
template <typename Header>
@@ -485,6 +486,23 @@ void packet::trim_front(size_t how_much) {
}
}
inline
void packet::trim_back(size_t how_much) {
assert(how_much <= _impl->_len);
_impl->_len -= how_much;
size_t i = _impl->_nr_frags - 1;
while (how_much && how_much >= _impl->_frags[i].size) {
how_much -= _impl->_frags[i--].size;
}
_impl->_nr_frags = i + 1;
if (how_much) {
_impl->_frags[i].size -= how_much;
if (i == 0 && _impl->using_internal_data()) {
_impl->_headroom += how_much;
}
}
}
template <typename Header>
Header*
packet::prepend_header(size_t extra_size) {