move directory

Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

perflib/nametable.go

@@ -0,0 +1,76 @@
+package perflib
+
+import (
+	"bytes"
+	"fmt"
+	"strconv"
+)
+
+// Initialize global name tables
+// TODO: profiling, add option to disable name tables if necessary
+// Not sure if we should resolve the names at all or just have the caller do it on demand
+// (for many use cases the index is sufficient)
+
+var CounterNameTable = *QueryNameTable("Counter 009")
+var HelpNameTable = *QueryNameTable("Help 009")
+
+func (p *perfObjectType) LookupName() string {
+	return CounterNameTable.LookupString(p.ObjectNameTitleIndex)
+}
+
+func (p *perfObjectType) LookupHelp() string {
+	return HelpNameTable.LookupString(p.ObjectHelpTitleIndex)
+}
+
+type NameTable struct {
+	byIndex  map[uint32]string
+	byString map[string]uint32
+}
+
+func (t *NameTable) LookupString(index uint32) string {
+	return t.byIndex[index]
+}
+
+func (t *NameTable) LookupIndex(str string) uint32 {
+	return t.byString[str]
+}
+
+// QueryNameTable Query a perflib name table from the registry. Specify the type and the language
+// code (i.e. "Counter 009" or "Help 009") for English language.
+func QueryNameTable(tableName string) *NameTable {
+	nameTable := new(NameTable)
+	nameTable.byIndex = make(map[uint32]string)
+
+	buffer, err := queryRawData(tableName)
+	if err != nil {
+		panic(err)
+	}
+	r := bytes.NewReader(buffer)
+	for {
+		index, err := readUTF16String(r)
+		if err != nil {
+			break
+		}
+
+		desc, err := readUTF16String(r)
+		if err != nil {
+			break
+		}
+
+		indexInt, _ := strconv.Atoi(index)
+
+		if err != nil {
+			panic(fmt.Sprint("Invalid index ", index))
+		}
+
+		nameTable.byIndex[uint32(indexInt)] = desc
+	}
+
+	nameTable.byString = make(map[string]uint32)
+
+	for k, v := range nameTable.byIndex {
+		nameTable.byString[v] = k
+	}
+
+	return nameTable
+}