Tag Archives: ASCii Table

News from the blog 2022-04-22


I was interviewed by Radio America Barcelona, in their studios in Barcelona.

RAB is a radio for the Catalan diaspora and expats.

The interview was broadcasted by Twitch and can be watched. It’s in Catalan language:


You can follow them:

Sant Jordi discounted books (promo)

Tomorrow 23th of April is Sant Jordi (Saint George), the patron of Catalonia, and the Catalan traditional celebration consist in this day women gifting a book to the men they love and men gifting a rose to the women they love.

I created a voucher for all my Python books, so, since during 23th of April you can acquire the four books per $10 USD in total.

This voucher is limited to 100 sales.


Python 3

I wrote an article with a Python 3 code that shows the length for file names in Linux ext3 and ext4 Filesystems and in ZFS Pools Filesystem.

I show basically how ASCii characters over 127 are encoded, reducing the maximum length of 255 bytes for the filename.


I’ve updated an article explaining how to create a ZPool raidz (RAID 5 equivalent) from three loop devices based on local files.

Thanks to those that bought my ZFS book this month. :)

HTML and JavaScript

I wrote a super simple code to hide the <p> using jQuery and JavaScript.

Free books


Books I bought

This month I bought these books.


I continued to block any Russian or Belarus Ip Address that connects to the blog.

I also started to block entire ranges of Ip’s from Digital Ocean, as many attacks come from Servers in their infrastructure.

Despite blocking tens of thousands of Ip Addresses, the number of visitors keep growing.

My Health

Thanks to my strict discipline I managed to recover super well and I’m healthier than before and guided by the satisfied doctors we removed two daily medicines.

I started a new medicine that is for the final phase of my recuperation, which doctors expect to be completely. In fact I’m much more healthier than I was before going to the hospital.


Will AI take the world?
Sadly, true history. The responsibility to deliver is from all of us.

Testing length of Linux ext3/ext4 and ZFS file names with Python 3

Last Update: 2022-04-16 15:22

So, I was working on a project and i wanted to test how long a file can be.

The resources I checked, and also the Kernel and C source I reviewed, were pointing that effectively the limit is 255 characters.

But I had one doubt… given that Python 3 String are UTF-8, and that Linux encode by default is UTF-8, will I be able to use 255 characters length, or this will be reduced as the Strings will be encoded as UTF-8 or Unicode?.

So I did a small Proof of Concept.

For the filenames I grabbed a fragment of the translation to English of the book epic book “Tirant lo Blanc” (The White Knight), one of the first books written in Catalan language and the first chivalry novel known in the world. You can download it for free it in:


Python Code:

from carleslibs.fileutils import FileUtils
from colorama import Fore, Back, Style , init

class ColorUtils:

    def __init__(self):
        # For Colorama on Windows

    def print_error(self, s_text, s_end="\n"):
        Prints errors in Red.
        :param s_text:
        print(Fore.RED + s_text)
        print(Style.RESET_ALL, end=s_end)

    def print_success(self, s_text, s_end="\n"):
        Prints errors in Green.
        :param s_text:
        print(Fore.GREEN + s_text)
        print(Style.RESET_ALL, end=s_end)

    def print_label(self, s_text, s_end="\n"):
        Prints a label and not the end line
        :param s_text:
        print(Fore.BLUE + s_text, end="")
        print(Style.RESET_ALL, end=s_end)

    def return_text_blue(self, s_text):
        Restuns a Text
        :param s_text:
        :return: String
        s_text_return = Fore.BLUE + s_text + Style.RESET_ALL
        return s_text_return

if __name__ == "__main__":

    o_color = ColorUtils()
    o_file = FileUtils()

    s_text = "In the fertile, rich and lovely island of England there lived a most valiant knight, noble by his lineage and much more for his "
    s_text += "courage.  In his great wisdom and ingenuity he had served the profession of chivalry for many years and with a great deal of honor, "
    s_text += "and his fame was widely known throughout the world.  His name was Count William of Warwick.  This was a very strong knight "
    s_text += "who, in his virile youth, had practiced the use of arms, following wars on sea as well as land, and he had brought many "
    s_text += "battles to a successful conclusion."

    o_color.print_label("Erasure Code project by Carles Mateo")
    print("Task 237 - Proof of Concep of Long File Names, encoded is ASCii, in Linux ext3 and ext4 Filesystems")
    print("Using as a sample a text based on the translation of Tirant Lo Blanc")
    print("Sample text used:")
    print("-" * 30)
    print("This test uses the OpenSource libraries from Carles Mateo carleslibs")
    print("Initiating tests")

    s_dir = "task237_tests"

    if o_file.folder_exists(s_dir) is True:
        o_color.print_success("Directory " + s_dir + " already existed, skipping creation")
        b_success = o_file.create_folder(s_dir)
        if b_success is True:
            o_color.print_success("Directory " + s_dir + " created successfully")
            o_color.print_error("Directory " + s_dir + " creation failed")

    for i_length in range(200, 512, 1):
        s_filename = s_dir + "/" + s_text[0:i_length]
        b_success = o_file.write(s_file=s_filename, s_text=s_text)
        s_output = "Writing file length: "
        print(s_output, end="")
        o_color.print_label(str(i_length).rjust(3), s_end="")
        print(" file name: ", end="")
        o_color.print_label(s_filename, s_end="")
        print(": ", end="")
        if b_success is False:
            o_color.print_error("failed", s_end="\n")
            o_color.print_success("success", s_end="\n")

    # Note: up to 255 work, 256 fails

I tried this in an Ubuntu Virtual Box VM.

As part of my tests I tried to add a non typical character in English, ASCii >127, like Ç.

When I use ASCii character < 128 (0 to 127) for the filenames in ext3/ext4 and in a ZFS Pool, I can use 255 positions. But when I add characters that are not typical, like the Catalan ç Ç or accents Àí the space available is reduced, suggesting the characters are being encoded:

Ç has value 128 in the ASCii table and ç 135.

I used my Open Source carleslibs and the package colorama.

Install them with:

pip3 install carleslibs colorama