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Commit 67958f7f authored by Max Kellermann's avatar Max Kellermann
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util/{Static,Foreign}FifoBuffer: lazy shift

Reduce the number of unnecessary memmove() calls.
parent ab9c5272
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Showing with 10 additions and 2 deletions
src/util/ForeignFifoBuffer.hxx
View file @ 67958f7f
...@@ -147,7 +147,11 @@ public: ...@@ -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);
} }
......
src/util/StaticFifoBuffer.hxx
View file @ 67958f7f
...@@ -92,7 +92,11 @@ public: ...@@ -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);
} }
......
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