48 lines
964 B
Go
48 lines
964 B
Go
package litestream
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import (
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"encoding/hex"
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"strings"
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)
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// HexDump returns hexdump output but with duplicate lines removed.
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func HexDump(b []byte) string {
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const prefixN = len("00000000")
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var output []string
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var prev string
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var ellipsis bool
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lines := strings.Split(strings.TrimSpace(hex.Dump(b)), "\n")
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for i, line := range lines {
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// Add line to output if it is not repeating or the last line.
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if i == 0 || i == len(lines)-1 || trimPrefixN(line, prefixN) != trimPrefixN(prev, prefixN) {
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output = append(output, line)
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prev, ellipsis = line, false
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continue
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}
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// Add an ellipsis for the first duplicate line.
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if !ellipsis {
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output = append(output, "...")
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ellipsis = true
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continue
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}
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}
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return strings.Join(output, "\n")
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}
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func trimPrefixN(s string, n int) string {
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if len(s) < n {
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return ""
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}
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return s[n:]
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}
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func assert(condition bool, message string) {
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if !condition {
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panic("assertion failed: " + message)
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}
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}
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