micropython-lib.yaml

---
packages:
  - name: aioespnow
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/aioespnow
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Extends the micropython espnow module with methods to support asyncio.
  - name: aiorepl
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/aiorepl
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: >-
      Provides an asynchronous REPL that can run concurrently with an asyncio,
      also allowing await expressions.
  - name: aioble
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/bluetooth/aioble
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: aioble-central
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/bluetooth/aioble-central
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: aioble-client
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/bluetooth/aioble-client
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: aioble-core
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/bluetooth/aioble-core
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: aioble-l2cap
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/bluetooth/aioble-l2cap
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: aioble-peripheral
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/bluetooth/aioble-peripheral
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: aioble-security
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/bluetooth/aioble-security
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: aioble-server
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/bluetooth/aioble-server
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: bundle-networking
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/bundles/bundle-networking
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: >-
      Common networking packages for all network-capable deployments of
      MicroPython.
  - name: onewire
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/bus/onewire
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Onewire driver.
  - name: wm8960
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/codec/wm8960
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: WM8960 codec.
  - name: lcd160cr
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/display/lcd160cr
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: LCD160CR driver.
  - name: ssd1306
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/display/ssd1306
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: SSD1306 OLED driver.
  - name: bmi270
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/imu/bmi270
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: BOSCH BMI270 IMU driver.
  - name: bmm150
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/imu/bmm150
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: BOSCH BMM150 magnetometer driver.
  - name: lsm6dsox
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/imu/lsm6dsox
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: ST LSM6DSOX imu driver.
  - name: lsm9ds1
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/imu/lsm9ds1
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Driver for ST LSM9DS1 IMU.
  - name: neopixel
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/led/neopixel
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: WS2812/NeoPixel driver.
  - name: nrf24l01
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/radio/nrf24l01
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: nrf24l01 2.4GHz radio driver.
  - name: dht
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/sensor/dht
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: DHT11 & DHT22 temperature/humidity sensor driver.
  - name: ds18x20
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/sensor/ds18x20
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: DS18x20 temperature sensor driver.
  - name: hs3003
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/sensor/hs3003
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Renesas HS3003 Humidity and Temperature sensor driver.
  - name: hts221
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/sensor/hts221
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: HTS221 temperature/humidity sensor driver.
  - name: lps22h
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/sensor/lps22h
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: LPS22H temperature/pressure sensor driver.
  - name: mhz19
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/sensor/mhz19
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Driver for MH-Z19 CO2 sensor.
  - name: sdcard
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/storage/sdcard
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: SDCard block device driver.
  - name: espflash
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/espflash
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Provides a minimal ESP32 bootloader protocol implementation.
  - name: lora
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/lora/lora
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: lora-async
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/lora/lora-async
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: lora-stm32wl5
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/lora/lora-stm32wl5
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: lora-sx126x
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/lora/lora-sx126x
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: lora-sx127x
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/lora/lora-sx127x
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: lora-sync
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/lora/lora-sync
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: mip
    docs: https://github.com/micropython/micropython-lib/tree/master/micropython/mip
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: On-device package installer for network-capable boards
  - name: mip-cmdline
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/mip-cmdline
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Optional support for running `micropython -m mip`
  - name: ntptime
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/net/ntptime
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: NTP client.
  - name: webrepl
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/net/webrepl
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: WebREPL server.
  - name: senml
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/senml
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: SenML serialisation for MicroPython.
  - name: uaiohttpclient
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/uaiohttpclient
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: HTTP client module for MicroPython asyncio module
  - name: ucontextlib
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/ucontextlib
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Minimal subset of contextlib for MicroPython low-memory ports
  - name: udnspkt
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/udnspkt
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Make and parse DNS packets (Sans I/O approach).
  - name: umqtt.robust
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/umqtt.robust
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: umqtt.simple
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/umqtt.simple
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Lightweight MQTT client for MicroPython.
  - name: upysh
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/upysh
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Minimalistic file shell using native Python syntax.
  - name: urequests
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/urequests
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: urllib.urequest
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/urllib.urequest
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: usb-device
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/usb/usb-device
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: usb-device-cdc
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/usb/usb-device-cdc
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: usb-device-hid
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/usb/usb-device-hid
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: usb-device-keyboard
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/usb/usb-device-keyboard
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: usb-device-midi
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/usb/usb-device-midi
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: usb-device-mouse
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/usb/usb-device-mouse
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: xmltok
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/micropython/xmltok
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Simple XML tokenizer
  - name: aiohttp
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-ecosys/aiohttp
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: HTTP client module for MicroPython asyncio module
  - name: cbor2
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-ecosys/cbor2
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: iperf3
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-ecosys/iperf3
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: pyjwt
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-ecosys/pyjwt
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: requests
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-ecosys/requests
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: abc
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/abc
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: argparse
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/argparse
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: base64
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/base64
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: binascii
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/binascii
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: bisect
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/bisect
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: cmd
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/cmd
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: collections
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/collections
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: collections-defaultdict
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/collections-defaultdict
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: contextlib
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/contextlib
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Port of contextlib for micropython
  - name: copy
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/copy
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: curses.ascii
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/curses.ascii
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: datetime
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/datetime
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: errno
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/errno
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: fnmatch
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/fnmatch
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: functools
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/functools
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: gzip
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/gzip
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: hashlib
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/hashlib
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: hashlib-core
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/hashlib-core
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: hashlib-sha224
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/hashlib-sha224
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Adds the SHA224 hash algorithm to hashlib.
  - name: hashlib-sha256
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/hashlib-sha256
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Adds the SHA256 hash algorithm to hashlib.
  - name: hashlib-sha384
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/hashlib-sha384
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Adds the SHA384 hash algorithm to hashlib.
  - name: hashlib-sha512
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/hashlib-sha512
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Adds the SHA512 hash algorithm to hashlib.
  - name: heapq
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/heapq
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: hmac
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/hmac
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: html
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/html
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: inspect
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/inspect
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: io
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/io
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: itertools
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/itertools
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: keyword
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/keyword
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: locale
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/locale
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: logging
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/logging
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: operator
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/operator
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: os
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/os
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: os-path
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/os-path
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: pathlib
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/pathlib
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: pickle
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/pickle
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: pkg_resources
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/pkg_resources
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: pkgutil
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/pkgutil
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: pprint
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/pprint
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: quopri
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/quopri
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: random
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/random
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: shutil
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/shutil
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: ssl
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/ssl
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: stat
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/stat
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: string
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/string
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: struct
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/struct
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: tarfile
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/tarfile
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Read-only implementation of Python's tarfile.
  - name: tarfile-write
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/tarfile-write
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Adds write (create/append) support to tarfile.
  - name: tempfile
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/tempfile
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: textwrap
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/textwrap
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: threading
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/threading
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: time
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/time
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: traceback
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/traceback
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: types
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/types
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: unittest
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/unittest
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: unittest-discover
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/unittest-discover
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: uu
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/uu
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: venv
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/venv
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: >-
      Support for creating MicroPython virtual environments using `micropython
      -m venv`
  - name: warnings
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/warnings
    index: https://micropython.org/pi/v2
    author: MicroPython
  - name: zlib
    docs: >-
      https://github.com/micropython/micropython-lib/tree/master/python-stdlib/zlib
    index: https://micropython.org/pi/v2
    author: MicroPython
    description: Compression and decompression using the deflate algorithm