5498f8548b
Test: symbol_inject -i a.out -o a.out2 -s symbol -v value Change-Id: I16cd8facbae754f679bef07ab0ba23638286e1d7
68 lines
1.9 KiB
Go
68 lines
1.9 KiB
Go
// Copyright 2018 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"debug/pe"
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"fmt"
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"io"
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"sort"
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)
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func findPESymbol(r io.ReaderAt, symbolName string) (uint64, uint64, error) {
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peFile, err := pe.NewFile(r)
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if err != nil {
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return maxUint64, maxUint64, cantParseError{err}
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}
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sort.Slice(peFile.Symbols, func(i, j int) bool {
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if peFile.Symbols[i].SectionNumber != peFile.Symbols[j].SectionNumber {
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return peFile.Symbols[i].SectionNumber < peFile.Symbols[j].SectionNumber
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}
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return peFile.Symbols[i].Value < peFile.Symbols[j].Value
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})
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for i, symbol := range peFile.Symbols {
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if symbol.Name == symbolName {
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var nextSymbol *pe.Symbol
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if i+1 < len(peFile.Symbols) {
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nextSymbol = peFile.Symbols[i+1]
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}
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return calculatePESymbolOffset(peFile, symbol, nextSymbol)
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}
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}
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return maxUint64, maxUint64, fmt.Errorf("symbol not found")
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}
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func calculatePESymbolOffset(file *pe.File, symbol *pe.Symbol, nextSymbol *pe.Symbol) (uint64, uint64, error) {
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section := file.Sections[symbol.SectionNumber-1]
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var end uint32
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if nextSymbol != nil && nextSymbol.SectionNumber != symbol.SectionNumber {
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nextSymbol = nil
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}
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if nextSymbol != nil {
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end = nextSymbol.Value
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} else {
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end = section.Size
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}
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size := end - symbol.Value - 1
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offset := section.Offset + symbol.Value
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return uint64(offset), uint64(size), nil
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}
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