main.go

gistfile1.txt

package main

import (
	"bytes"
	"fmt"
	"os"
)

func main() {
	if len(os.Args) != 5 {
		fmt.Println("Usage: go run main.go <inputFirmware> <outputFirmware> <originalFontFile> <fixedFontFile>")
		return
	}

	inputFirmware := os.Args[1]
	outputFirmware := os.Args[2]
	originalFontFile := os.Args[3]
	fixedFontFile := os.Args[4]

	// read firmware
	originalFirmwareData, err := os.ReadFile(inputFirmware)
	if err != nil {
		fmt.Println("Error reading input file:", err)
		return
	}

	// read original font
	originalFontData, err := os.ReadFile(originalFontFile)
	if err != nil {
		fmt.Println("Error reading input file:", err)
		return
	}

	// read fixed font file
	fixedFontData, err := os.ReadFile(fixedFontFile)
	if err != nil {
		fmt.Println("Error reading input file:", err)
		return
	}

	// Replace occurrences of oldBytes with newBytes
	originalFirmwareData = bytes.ReplaceAll(originalFirmwareData, originalFontData, fixedFontData)

	// Write the modified data to the output file
	err = os.WriteFile(outputFirmware, originalFirmwareData, 0644)
	if err != nil {
		fmt.Println("Error writing output file:", err)
		return
	}
}