Tar extract

import uctypes
import os
import time

# http://www.gnu.org/software/tar/manual/html_node/Standard.html
TAR_HEADER = {
    "name": (uctypes.ARRAY | 0, uctypes.UINT8 | 100),
    "size": (uctypes.ARRAY | 124, uctypes.UINT8 | 11),
}

DIRTYPE = "adresar"
REGTYPE = "soubor "

def roundup(val, align):
    return (val + align - 1) & ~(align - 1)

class FileSection:
    def __init__(self, f, content_len, aligned_len):
        self.f = f
        self.content_len = content_len
        self.align = aligned_len - content_len

    def read(self, sz=65536):
        if self.content_len == 0:
            return b""
        if sz > self.content_len:
            sz = self.content_len
        data = self.f.read(sz)
        sz = len(data)
        self.content_len -= sz
        return data

    def readinto(self, buf):
        if self.content_len == 0:
            return 0
        if len(buf) > self.content_len:
            buf = memoryview(buf)[: self.content_len]
        sz = self.f.readinto(buf)
        self.content_len -= sz
        return sz

    def skip(self):
        sz = self.content_len + self.align
        if sz:
            buf = bytearray(16)
            while sz:
                s = min(sz, 16)
                self.f.readinto(buf, s)
                sz -= s

class TarInfo:
    def __str__(self):
        return "TarInfo(%r, %s, %d)" % (self.name, self.type, self.size)

class TarFile:
    def __init__(self, name=None, fileobj=None):
        if fileobj:
            self.f = fileobj
        else:
            self.f = open(name, "rb")
        self.subf = None

    def next(self):
        if self.subf:
            self.subf.skip()
        buf = self.f.read(512)
        if not buf:
            return None

        h = uctypes.struct(uctypes.addressof(buf), TAR_HEADER, uctypes.LITTLE_ENDIAN)

        # Empty block means end of archive
        if h.name[0] == 0:
            return None

        d = TarInfo()
        d.name = str(h.name, "utf-8").rstrip("\0")
        d.size = int(bytes(h.size), 8)
        d.type = [REGTYPE, DIRTYPE][d.name[-1] == "/"]
        self.subf = d.subf = FileSection(self.f, d.size, roundup(d.size, 512))
        return d

    def __iter__(self):
        return self

    def __next__(self):
        v = self.next()
        if v is None:
            raise StopIteration
        return v

    def extractfile(self, tarinfo):
        return tarinfo.subf

def unpack(tar_path):

    def copyfileobj(src, dest, length=512):
        if hasattr(src, "readinto"):
            buf = bytearray(length)
            while True:
                sz = src.readinto(buf)
                if not sz:
                    break
                if sz == length:
                    dest.write(buf)
                else:
                    b = memoryview(buf)[:sz]
                    dest.write(b)
        else:
            while True:
                buf = src.read(length)
                if not buf:
                    break
                dest.write(buf)

    def exists(path):
        try:
            os.stat(path)
            return True
        except:
            return False

    t = TarFile(tar_path)

    for f in t:
        print("Rozbaluji {}: {}".format(f.type, f.name))
        if f.type == DIRTYPE:
            if f.name[-1:] == '/':
                name = f.name[:-1]
            else:
                name = f.name

            if not exists(name):
                os.mkdir(name)
        else:
            extracted = t.extractfile(f)

            with open(f.name, "wb") as fobj:
                copyfileobj(extracted, fobj)

print("*****************************")
print("***   Instalace Web IDE   ***")
print("***        v1.9.0         ***")
print("***                       ***")
print("***  Milan Spacek  2024   ***")
print("***                       ***")
print("*****************************")
print()

try:
    unpack("ide_1_20.tar")
except:
    print("Chyba pri rozbalovani souboru")

try:
    os.remove("ide_1_20.tar")
    os.remove("install_1_20.py")
except:
    print("Nepodarilo se vymazat instalacni soubory")

print()
print("*******************************")
print("*** Hotovo restartuji desku ***")
print("*******************************")

time.sleep_ms(1000)
from machine import reset
reset()