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util/CircularBuffer: add method GetSpace()

This commit is contained in:
Max Kellermann 2014-03-15 23:29:07 +01:00
parent 89ac111853
commit 328860c8ba
2 changed files with 22 additions and 0 deletions
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12
src/util/CircularBuffer.hxx
View File

@ -107,6 +107,18 @@ public:
: capacity - head + tail;
}
/**
* 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().

10
test/TestCircularBuffer.hxx
View File

@ -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);