Différences

Ci-dessous, les différences entre deux révisions de la page.

--- tech:notes_hexa [2025/10/10 09:26] – Jean-Baptiste
+++ tech:notes_hexa [2026/06/07 19:12] (Version actuelle) – modification externe 127.0.0.1
@@ Ligne 1: / Ligne 1: @@
+<!DOCTYPE markdown>
+{{tag>Brouillon Encodage Script}}
+# Notes Hexa
+Voir l'excellent éditeur Hexadécimal wxHexEditor :
+* http://www.wxhexeditor.org/
+* https://github.com/EUA/wxHexEditor
+Exemple
+~~~bash
+hexdump -C plop.bin
+xxd plop.bin
+~~~
+Diff
+~~~
+$ diff <(xxd Bootable_NoEmulation.img) <(xxd Bootable_NoEmulation_1.img)
+c1
+< 00000000: faea 407c 0000 9090 1000 0000 e20a 0000  ..@|............
+---
+> 00000000: faea 407c 0000 9090 1000 0000 e800 0000  ..@|............
+#colordiff -y <(xxd Bootable_NoEmulation.img) <(xxd Bootable_NoEmulation_1.img)
+$ cmp -b Bootable_NoEmulation.img Bootable_NoEmulation_1.img
+Bootable_NoEmulation.img Bootable_NoEmulation_1.img differ: byte 13, line 1 is 342 M-b 350 M-h
+$ cmp -l Bootable_NoEmulation.img Bootable_NoEmulation_1.img
+342 350
+  12   0
+$ cmp -bl Bootable_NoEmulation.img Bootable_NoEmulation_1.img
+342 M-b  350 M-h
+  12 ^J     0 ^@
+~~~
+~~~
+$ echo -n "co" | od -x  --endian=big
+0000000 636f
+~~~
+~~~
+$ echo -n "co" | hexdump -C
+00000000  63 6f                                             |co|
+00000002
+~~~
+~~~
+$ echo -n "co" | xxd
+0000000: 636f                                     co
+~~~
+~~~
+$ printf "\x63\x6f\n"
+co
+~~~
+~~~bash
+$ echo  "636f" | sed -e 's/\(..\)/\\x\1/g' | xargs -0  printf
+co
+~~~
+## Fonctions
+~~~bash
+HexToAscii() {
+  echo "$@" | sed -e 's/[[:space:]]//g' | sed -e 's/\(..\)/\\x\1/g' | xargs -0  printf
+}
+AsciiToHex() {
+  echo -n "$@" | od -x  --endian=big | sed -e 's/^....... //' | sed '$d'
+}
+~~~
+## Autres
+~~~Nash
+wxHexEditor --compare file1 file2
+~~~