let hexdump (bytes: byte[]) = let blockToHex (block: seq) = let len = block |> Seq.length let s = seq { for i in 0..15 do let space = if (i+1) % 4 = 0 then " " else " " let value = if i < len then sprintf "%02x%s" (Seq.nth i block) space else sprintf "--%s" space yield value } s |> Seq.reduce (+) let blockToString (block: seq) = let safeChars block = block |> Seq.map (fun b -> if b < 32uy || b >= 127uy then byte('?') else b) sprintf "|%s|" (System.String(block |> safeChars |> Seq.map char |> Array.ofSeq)) bytes |> Seq.ofArray |> Seq.mapi (fun i x -> (i, x)) |> Seq.groupBy (fun (i, x) -> i / 16) |> Seq.map (fun (i, block) -> i, (block |> Seq.map snd)) |> Seq.iter (fun (i, block) -> printf "%08x " (i*16) printf "%s" (blockToHex block) printf " %s" (blockToString block) printfn "") let test() = let input = [|0uy..255uy|] hexdump input // 00000000 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f |????????????????| // 00000010 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f |????????????????| // 00000020 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f | !"#$%&'()*+,-./| // 00000030 30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f |0123456789:;<=>?| // 00000040 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f |@ABCDEFGHIJKLMNO| // 00000050 50 51 52 53 54 55 56 57 58 59 5a 5b 5c 5d 5e 5f |PQRSTUVWXYZ[\]^_| // 00000060 60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f |`abcdefghijklmno| // 00000070 70 71 72 73 74 75 76 77 78 79 7a 7b 7c 7d 7e 7f |pqrstuvwxyz{|}~?| // 00000080 80 81 82 83 84 85 86 87 88 89 8a 8b 8c 8d 8e 8f |????????????????| // 00000090 90 91 92 93 94 95 96 97 98 99 9a 9b 9c 9d 9e 9f |????????????????| // 000000a0 a0 a1 a2 a3 a4 a5 a6 a7 a8 a9 aa ab ac ad ae af |????????????????| // 000000b0 b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 ba bb bc bd be bf |????????????????| // 000000c0 c0 c1 c2 c3 c4 c5 c6 c7 c8 c9 ca cb cc cd ce cf |????????????????| // 000000d0 d0 d1 d2 d3 d4 d5 d6 d7 d8 d9 da db dc dd de df |????????????????| // 000000e0 e0 e1 e2 e3 e4 e5 e6 e7 e8 e9 ea eb ec ed ee ef |????????????????| // 000000f0 f0 f1 f2 f3 f4 f5 f6 f7 f8 f9 fa fb fc fd fe ff |????????????????| let test2() = let input = "The quick brown fox jumps over a lazy dog.".ToCharArray() |> Array.map byte hexdump input // 00000000 54 68 65 20 71 75 69 63 6b 20 62 72 6f 77 6e 20 |The quick brown | // 00000010 66 6f 78 20 6a 75 6d 70 73 20 6f 76 65 72 20 61 |fox jumps over a| // 00000020 20 6c 61 7a 79 20 64 6f 67 2e -- -- -- -- -- -- | lazy dog.|