バイナリデータを Golang の []byte リテラル表記に変換する簡単なお仕事 ref: http://qiita.com/spiegel-im-spiegel/items/272c1b8c01eb287059e0

file0.go

package godump

import (
    "bytes"
    "fmt"
    "io"
)

//DumpBytes returns []bytes literal string
func DumpBytes(r io.Reader, name string) (io.Reader, error) {
    buf := new(bytes.Buffer)
    b := make([]byte, 1)
    var err error
    sep := fmt.Sprintf("var %s = []byte{", name)
    for true {
        if _, err = r.Read(b); err != nil {
            break
        }
        fmt.Fprintf(buf, "%s%#02x", sep, b)
        sep = ", "
    }
    fmt.Fprintln(buf, "}")
    return buf, nil
}

file0.txt

$ go get github.com/spiegel-im-spiegel/godump

file1.txt

$ go get github.com/spiegel-im-spiegel/godump

file2.go

dump, err := godump.DumpBytes(bytes.NewBufferString("hello world"), "foobar")
if err != nil {
    return
}
io.Copy(os.Stdout, dump)
// Output:
// var foobar = []byte{0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64}

file2.txt

$ dep ensure -add github.com/spiegel-im-spiegel/godump

file3.go

dump, err := godump.DumpBytes(bytes.NewBufferString("hello world"), "foobar")
if err != nil {
    return
}
io.Copy(os.Stdout, dump)
// Output:
// var foobar = []byte{0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64}

file3.txt

$ godump -h
Usage:
  godump [flags] [binary file]

Flags:
  -h, --help          help for godump
  -n, --name string   value name (default "dumpList")

file4.txt

$ godump -h
Usage:
  godump [flags] [binary file]

Flags:
  -h, --help          help for godump
  -n, --name string   value name (default "dumpList")

file5.txt

$ echo hello world | godump -n foobar
var foobar = []byte{0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x0a}

file6.txt

$ cat input.txt
hello world

$ godump -n foobar input.txt
var foobar = []byte{0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64}