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Commit 328860c8 authored by Max Kellermann's avatar Max Kellermann
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util/CircularBuffer: add method GetSpace()

parent 89ac1118
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Showing with 22 additions and 0 deletions
src/util/CircularBuffer.hxx
View file @ 328860c8
......@@ -108,6 +108,18 @@ public:
}
/**
* Returns the number of elements that can be added to this
* buffer.
*/
constexpr size_type GetSpace() const {
/* space = capacity - size - 1 */
return (head <= tail
? capacity - tail + head
: head - tail)
- 1;
}
/**
* Prepares writing. Returns a buffer range which may be written.
* When you are finished, call Append().
*/
......
test/TestCircularBuffer.hxx
View file @ 328860c8
......@@ -33,6 +33,7 @@ public:
CPPUNIT_ASSERT_EQUAL(true, buffer.IsEmpty());
CPPUNIT_ASSERT_EQUAL(false, buffer.IsFull());
CPPUNIT_ASSERT_EQUAL(size_t(0), buffer.GetSize());
CPPUNIT_ASSERT_EQUAL(size_t(7), buffer.GetSpace());
CPPUNIT_ASSERT_EQUAL(true, buffer.Read().IsEmpty());
CPPUNIT_ASSERT_EQUAL(false, buffer.Write().IsEmpty());
CPPUNIT_ASSERT_EQUAL(&data[0], buffer.Write().data);
......@@ -45,6 +46,7 @@ public:
CPPUNIT_ASSERT_EQUAL(false, buffer.IsFull());
CPPUNIT_ASSERT_EQUAL(false, buffer.Read().IsEmpty());
CPPUNIT_ASSERT_EQUAL(size_t(1), buffer.GetSize());
CPPUNIT_ASSERT_EQUAL(size_t(6), buffer.GetSpace());
CPPUNIT_ASSERT_EQUAL(size_t(1), buffer.Read().size);
CPPUNIT_ASSERT_EQUAL(&data[0], buffer.Read().data);
CPPUNIT_ASSERT_EQUAL(false, buffer.Write().IsEmpty());
......@@ -58,6 +60,7 @@ public:
CPPUNIT_ASSERT_EQUAL(true, buffer.IsFull());
CPPUNIT_ASSERT_EQUAL(false, buffer.Read().IsEmpty());
CPPUNIT_ASSERT_EQUAL(size_t(7), buffer.GetSize());
CPPUNIT_ASSERT_EQUAL(size_t(0), buffer.GetSpace());
CPPUNIT_ASSERT_EQUAL(size_t(7), buffer.Read().size);
CPPUNIT_ASSERT_EQUAL(&data[0], buffer.Read().data);
CPPUNIT_ASSERT_EQUAL(true, buffer.Write().IsEmpty());
......@@ -69,6 +72,7 @@ public:
CPPUNIT_ASSERT_EQUAL(false, buffer.IsFull());
CPPUNIT_ASSERT_EQUAL(false, buffer.Read().IsEmpty());
CPPUNIT_ASSERT_EQUAL(size_t(6), buffer.GetSize());
CPPUNIT_ASSERT_EQUAL(size_t(1), buffer.GetSpace());
CPPUNIT_ASSERT_EQUAL(size_t(6), buffer.Read().size);
CPPUNIT_ASSERT_EQUAL(&data[1], buffer.Read().data);
CPPUNIT_ASSERT_EQUAL(false, buffer.Write().IsEmpty());
......@@ -83,6 +87,7 @@ public:
CPPUNIT_ASSERT_EQUAL(true, buffer.IsFull());
CPPUNIT_ASSERT_EQUAL(false, buffer.Read().IsEmpty());
CPPUNIT_ASSERT_EQUAL(size_t(7), buffer.GetSize());
CPPUNIT_ASSERT_EQUAL(size_t(0), buffer.GetSpace());
CPPUNIT_ASSERT_EQUAL(size_t(7), buffer.Read().size);
CPPUNIT_ASSERT_EQUAL(&data[1], buffer.Read().data);
CPPUNIT_ASSERT_EQUAL(true, buffer.Write().IsEmpty());
......@@ -94,6 +99,7 @@ public:
CPPUNIT_ASSERT_EQUAL(false, buffer.IsFull());
CPPUNIT_ASSERT_EQUAL(false, buffer.Read().IsEmpty());
CPPUNIT_ASSERT_EQUAL(size_t(4), buffer.GetSize());
CPPUNIT_ASSERT_EQUAL(size_t(3), buffer.GetSpace());
CPPUNIT_ASSERT_EQUAL(size_t(4), buffer.Read().size);
CPPUNIT_ASSERT_EQUAL(&data[4], buffer.Read().data);
CPPUNIT_ASSERT_EQUAL(false, buffer.Write().IsEmpty());
......@@ -107,6 +113,7 @@ public:
CPPUNIT_ASSERT_EQUAL(false, buffer.IsFull());
CPPUNIT_ASSERT_EQUAL(false, buffer.Read().IsEmpty());
CPPUNIT_ASSERT_EQUAL(size_t(6), buffer.GetSize());
CPPUNIT_ASSERT_EQUAL(size_t(1), buffer.GetSpace());
CPPUNIT_ASSERT_EQUAL(size_t(4), buffer.Read().size);
CPPUNIT_ASSERT_EQUAL(&data[4], buffer.Read().data);
CPPUNIT_ASSERT_EQUAL(false, buffer.Write().IsEmpty());
......@@ -120,6 +127,7 @@ public:
CPPUNIT_ASSERT_EQUAL(true, buffer.IsFull());
CPPUNIT_ASSERT_EQUAL(false, buffer.Read().IsEmpty());
CPPUNIT_ASSERT_EQUAL(size_t(7), buffer.GetSize());
CPPUNIT_ASSERT_EQUAL(size_t(0), buffer.GetSpace());
CPPUNIT_ASSERT_EQUAL(size_t(4), buffer.Read().size);
CPPUNIT_ASSERT_EQUAL(&data[4], buffer.Read().data);
CPPUNIT_ASSERT_EQUAL(true, buffer.Write().IsEmpty());
......@@ -131,6 +139,7 @@ public:
CPPUNIT_ASSERT_EQUAL(false, buffer.IsFull());
CPPUNIT_ASSERT_EQUAL(false, buffer.Read().IsEmpty());
CPPUNIT_ASSERT_EQUAL(size_t(3), buffer.GetSize());
CPPUNIT_ASSERT_EQUAL(size_t(4), buffer.GetSpace());
CPPUNIT_ASSERT_EQUAL(size_t(3), buffer.Read().size);
CPPUNIT_ASSERT_EQUAL(&data[0], buffer.Read().data);
CPPUNIT_ASSERT_EQUAL(false, buffer.Write().IsEmpty());
......@@ -145,6 +154,7 @@ public:
CPPUNIT_ASSERT_EQUAL(true, buffer.IsEmpty());
CPPUNIT_ASSERT_EQUAL(false, buffer.IsFull());
CPPUNIT_ASSERT_EQUAL(size_t(0), buffer.GetSize());
CPPUNIT_ASSERT_EQUAL(size_t(7), buffer.GetSpace());
CPPUNIT_ASSERT_EQUAL(true, buffer.Read().IsEmpty());
CPPUNIT_ASSERT_EQUAL(false, buffer.Write().IsEmpty());
CPPUNIT_ASSERT_EQUAL(&data[3], buffer.Write().data);
......
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