set slice capacity

This commit sets the capacity on slices returned from
`Bucket.Get()` to match the slice length. Previously
the capacity would be the size of the mmap max size.

This does not cause any backwards compatibility issues,
however, it does allow users to `append()` to the returned
slice since that will cause Go to realloc a new slice on the
heap.

Fixes #544

1 files changed, 2 insertions, 2 deletions

diff --git a/page.go b/page.go
index 818aa1b..4a55528 100644
--- a/page.go
+++ b/page.go
@@ -111,13 +111,13 @@ type leafPageElement struct {
 // key returns a byte slice of the node key.
 func (n *leafPageElement) key() []byte {
 	buf := (*[maxAllocSize]byte)(unsafe.Pointer(n))
-	return (*[maxAllocSize]byte)(unsafe.Pointer(&buf[n.pos]))[:n.ksize]
+	return (*[maxAllocSize]byte)(unsafe.Pointer(&buf[n.pos]))[:n.ksize:n.ksize]
 }
 
 // value returns a byte slice of the node value.
 func (n *leafPageElement) value() []byte {
 	buf := (*[maxAllocSize]byte)(unsafe.Pointer(n))
-	return (*[maxAllocSize]byte)(unsafe.Pointer(&buf[n.pos+n.ksize]))[:n.vsize]
+	return (*[maxAllocSize]byte)(unsafe.Pointer(&buf[n.pos+n.ksize]))[:n.vsize:n.vsize]
 }
 
 // PageInfo represents human readable information about a page.