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49 lines
842 B
Go
49 lines
842 B
Go
package template
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import "bytes"
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// hexdump is a template function that creates a hux dump
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// similar to xxd -i.
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func hexdump(v interface{}) string {
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var data []byte
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switch vv := v.(type) {
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case []byte:
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data = vv
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case string:
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data = []byte(vv)
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default:
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return ""
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}
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var buf bytes.Buffer
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for i, b := range data {
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dst := make([]byte, 4)
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src := []byte{b}
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encode(dst, src, ldigits)
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buf.Write(dst)
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buf.WriteString(",")
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if (i+1)%cols == 0 {
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buf.WriteString("\n")
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}
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}
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return buf.String()
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}
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// default number of columns
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const cols = 12
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// hex lookup table for hex encoding
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const (
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ldigits = "0123456789abcdef"
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udigits = "0123456789ABCDEF"
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)
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func encode(dst, src []byte, hextable string) {
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dst[0] = '0'
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dst[1] = 'x'
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for i, v := range src {
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dst[i+1*2] = hextable[v>>4]
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dst[i+1*2+1] = hextable[v&0x0f]
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}
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}
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