Created
September 5, 2021 11:51
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Small Go program to do a binary diff between two files
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| package main | |
| import ( | |
| "fmt" | |
| "io/ioutil" | |
| "os" | |
| ) | |
| func unwrapPathError(err error) error { | |
| if e, ok := err.(*os.PathError); ok { | |
| return e.Err | |
| } | |
| return err | |
| } | |
| func main() { | |
| if len(os.Args) != 3 { | |
| fmt.Fprintf(os.Stderr, "usage: %v FILE FILE\n", os.Args[0]) | |
| os.Exit(1) | |
| } | |
| f1, f2 := os.Args[1], os.Args[2] | |
| d1, err := ioutil.ReadFile(f1) | |
| if err != nil { | |
| fmt.Fprintf(os.Stderr, "cannot read file '%v': %v\n", f1, unwrapPathError(err)) | |
| os.Exit(1) | |
| } | |
| d2, err := ioutil.ReadFile(f2) | |
| if err != nil { | |
| fmt.Fprintf(os.Stderr, "cannot read file '%v': %v\n", f2, unwrapPathError(err)) | |
| os.Exit(1) | |
| } | |
| minLen := len(d1) | |
| if l := len(d2); l < minLen { | |
| minLen = l | |
| } | |
| for i := 0; i < minLen; i++ { | |
| b1, b2 := d1[i], d2[i] | |
| if b1 != b2 { | |
| fmt.Printf("%d: %x != %x\n", i, b1, b2) | |
| } | |
| } | |
| fmt.Printf("extra bytes in %s: %d\n", f1, len(d1)-minLen) | |
| fmt.Printf("extra bytes in %s: %d\n", f2, len(d2)-minLen) | |
| } |
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