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util/{Static,Foreign}FifoBuffer: lazy shift

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Reduce the number of unnecessary memmove() calls.
This commit is contained in:
Max Kellermann 2014-08-07 16:11:00 +02:00
parent ab9c527274
commit 67958f7fa7
2 changed files with 10 additions and 2 deletions
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6
src/util/ForeignFifoBuffer.hxx
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@ -147,7 +147,11 @@ public:
* When you are finished, call append(). * When you are finished, call append().
*/ */
Range Write() { Range Write() {
Shift(); if (IsEmpty())
Clear();
else if (tail == capacity)
Shift();
return Range(data + tail, capacity - tail); return Range(data + tail, capacity - tail);
} }

6
src/util/StaticFifoBuffer.hxx
View File

@ -92,7 +92,11 @@ public:
* When you are finished, call append(). * When you are finished, call append().
*/ */
Range Write() { Range Write() {
Shift(); if (IsEmpty())
Clear();
else if (tail == size)
Shift();
return Range(data + tail, size - tail); return Range(data + tail, size - tail);
} }