Function for creating a human readable hexdump from an iterator of bytes (bytes, bytearray, ctypes buffers etc)

hexdump.py

def hexdump(buf, size, minor_width=4, major_width=12, addr_len=4, ljust_char='·', unprintable_char='�', indent=''):
	
	lines = list()

	disp = ''
	hexa = ''
	row_start = 0

	for i, c in zip(range(size), buf):

		if i % major_width == 0:
			addr = f'{hex(row_start)[2:].zfill(addr_len)}: '
			row_start = i

		if i and (i % major_width == 0):
			lines.append(f'{indent}{addr}{disp} | {hexa} |')
			hexa = ''
			disp = ''

		elif i and (i % minor_width == 0):
			hexa += ' '	#Insert extra space

		if isinstance(c, bytes):
			assert len(c) == 1
			c = ord(c)

		if c < 0x20:
			#C0 control codes ( https://en.wikipedia.org/wiki/Unicode_control_characters#Control_pictures )
			disp += chr(c) if c >= 32 else chr(0x2400 + c)	
		elif 0x80 <= c <= 0x9F:
			#C1 control codes - just replace
			disp += unprintable_char
		else:
			disp += chr(c)

		
		if hexa:
			hexa += ' '
		hexa += str(hex(c)[2:]).zfill(2)

	if disp:		
		addr = f'{hex(row_start)[2:].zfill(addr_len)}: '
		ljust_hexa = hexa
		offset = i % major_width
		for missing in range(major_width - offset - 1):
			i = missing + offset + 1
			if i % minor_width == 0:
				ljust_hexa += ' '
			ljust_hexa += ' ' + ljust_char * 2 
		lines.append(f'{indent}{addr}{disp.ljust(major_width, ljust_char)} | {ljust_hexa} |')

	return '\n'.join(lines)