From 28f170fe81e25b865cd981f658a3a5f3c5845504 Mon Sep 17 00:00:00 2001
From: Pavel 'LEdoian' Turinsky <ledoian@matfyz.cz>
Date: Sun, 14 Jan 2024 13:28:12 +0100
Subject: [PATCH] Implement hexdumping

Not used yet, though
---
 sopass.py | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/sopass.py b/sopass.py
index 63caa7e..d13dfc6 100755
--- a/sopass.py
+++ b/sopass.py
@@ -8,6 +8,7 @@ from stat import * # suggested usage…
 import selectors
 from dataclasses import dataclass
 import logging as log
+import math
 # Note: get/setrlimit are in resource module
 
 def setup_logging():
@@ -21,9 +22,19 @@ class Direction:
 	sigil: str
 	color: str
 
-def hexdump(data: bytes) -> str:
-	# TODO: dump somehow
-	...
+def hexdump(data: bytes) -> list[str]: # We will be prefixing the lines with sigils, so no need to join.
+	result = []
+	offset = 0
+	offset_len = math.ceil(math.log(len(data), 16))
+	while data:
+		left_chunk, right_chunk, data = data[:8], data[8:16], data[16:]
+		left_ascii = ''.join(chr(x) if x in range(32,127) else ',' for x in left_chunk)
+		right_ascii = ''.join(chr(x) if x in range(32,127) else ',' for x in right_chunk)
+		offset_str = f'{offset:0{offset_len}x}'
+		line = f"{offset_str}  {left_chunk.hex(' ').ljust(23)}  {right_chunk.hex(' ').ljust(23)}  |{left_ascii.ljust(8)}{right_ascii.ljust(8)}|"
+		offset += 16
+		result.append(line)
+	return result
 
 def fdinfo(fd: int) -> str:
 	stat = os.fstat(fd)