diff --git a/cmd/symbol_inject/pe.go b/cmd/symbol_inject/pe.go
new file mode 100644
index 0000000..86f6162
--- /dev/null
+++ b/cmd/symbol_inject/pe.go
@@ -0,0 +1,67 @@
+// Copyright 2018 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"debug/pe"
+	"fmt"
+	"io"
+	"sort"
+)
+
+func findPESymbol(r io.ReaderAt, symbolName string) (uint64, uint64, error) {
+	peFile, err := pe.NewFile(r)
+	if err != nil {
+		return maxUint64, maxUint64, cantParseError{err}
+	}
+
+	sort.Slice(peFile.Symbols, func(i, j int) bool {
+		if peFile.Symbols[i].SectionNumber != peFile.Symbols[j].SectionNumber {
+			return peFile.Symbols[i].SectionNumber < peFile.Symbols[j].SectionNumber
+		}
+		return peFile.Symbols[i].Value < peFile.Symbols[j].Value
+	})
+
+	for i, symbol := range peFile.Symbols {
+		if symbol.Name == symbolName {
+			var nextSymbol *pe.Symbol
+			if i+1 < len(peFile.Symbols) {
+				nextSymbol = peFile.Symbols[i+1]
+			}
+			return calculatePESymbolOffset(peFile, symbol, nextSymbol)
+		}
+	}
+
+	return maxUint64, maxUint64, fmt.Errorf("symbol not found")
+}
+
+func calculatePESymbolOffset(file *pe.File, symbol *pe.Symbol, nextSymbol *pe.Symbol) (uint64, uint64, error) {
+	section := file.Sections[symbol.SectionNumber-1]
+
+	var end uint32
+	if nextSymbol != nil && nextSymbol.SectionNumber != symbol.SectionNumber {
+		nextSymbol = nil
+	}
+	if nextSymbol != nil {
+		end = nextSymbol.Value
+	} else {
+		end = section.Size
+	}
+
+	size := end - symbol.Value - 1
+	offset := section.Offset + symbol.Value
+
+	return uint64(offset), uint64(size), nil
+}