add cvss/v2score and tests

1 files changed, 32 insertions, 0 deletions

diff --git a/cvss/v2score.go b/cvss/v2score.go
new file mode 100644
index 0000000..5740c09
--- /dev/null
+++ b/cvss/v2score.go
@@ -0,0 +1,32 @@
+package cvss
+
+import (
+  "fmt"
+)
+
+// Individual CVSS v2 score.
+//
+// Note: since scores range from 0.0 to 10.0 with one decimal place of
+// precision, they can be safely represented as a uint8.
+type v2Score uint8
+
+// Return floating point representation of score.
+func newV2Score(val float64) (v2Score, error) {
+  // check score range
+  if val < 0.0 || val > 10.0 {
+    return v2Score(0), fmt.Errorf("score value out of range [0, 10]: %f", val)
+  }
+
+  // convert to score, return success
+  return v2Score(uint8(10.0 * val)), nil
+}
+
+// Return string representation of score.
+func (s v2Score) String() string {
+  return fmt.Sprintf("%d.%d", s / 10, s % 10)
+}
+
+// Return floating point representation of score.
+func (s v2Score) Float() float32 {
+  return float32(s) / 10.0
+}