Quick and dirty reader for HMZK font files

read_font_file.py

import fileinput
import sys
import struct

MAIN_SECTION_OFFSET = 0x10

def bin_picture(num):
    fmt = "{:016b}".format(num)
    fmt = fmt.replace("0", ".")
    fmt = fmt.replace("1", "#")
    return fmt

def dump_font(f, offset, count):
    f.seek(offset) # for english: 250 chinese: 0x3884

    for char in range(count):
        for i in range(16):
            data = f.read(2)
            data = struct.unpack(">H", data)
            print("0x{0:04x} {1}".format(f.tell(), bin_picture(data[0])))

        print()

    print("end of file!")

def read_chars(f, offset, count):
    f.seek(offset) # 15 for english
    for i in range(count):
        data = f.read(2)
        char_id = struct.unpack(">H", data)[0]
        print("0x{:04x} | 0x{:04x} {}".format(f.tell(), char_id, data.decode("utf-16-le")))

with open(sys.argv[1], "rb") as f:
    magic = f.read(4)

    if magic != b"HMZK":
        print("This file does not appear to be a HMZK font!")
        sys.exit(1)

    f.seek(MAIN_SECTION_OFFSET - 2)
    length = struct.unpack("<H", f.read(2))[0]

    print("font contains {} chars".format(length // 2))
    print()
    print("character section:")
    print("    start: 0x{0:04x}".format(MAIN_SECTION_OFFSET))
    print("    len: 0x{0:04x} ({0:d} bytes)".format(length))
    print()
    print("font section:")
    print("    start: 0x{0:04x}".format(MAIN_SECTION_OFFSET + length))
    print("    len: 0x{0:04x} ({0:d} bytes)".format(length * 2 * 16))
    print()

    # read_chars(f, MAIN_SECTION_OFFSET, length // 2)
    dump_font(f, MAIN_SECTION_OFFSET + length, length // 2)