|nala|_
About
=====
Binary `delta encoding`_ in Python 3.6+ and C.
Based on http://www.daemonology.net/bsdiff/ and `HDiffPatch`_, with
the following features:
- bsdiff, hdiffpatch and match-blocks algorithms.
- `sequential`_, hdiffpatch or `in-place`_ (resumable) patch types.
- BZ2, LZ4, LZMA, `Zstandard`_, `heatshrink`_ or CRLE compression.
- Sequential patches allow streaming.
- Maximum file size is 2 GB for the bsdiff algorithm. There is
practically no limit for the hdiffpatch and match-blocks algorithms.
- `Incremental apply patch`_ implemented in C, suitable for memory
constrained embedded devices. Only the sequential patch type is
supported.
- `SA-IS`_ or divsufsort instead of qsufsort for bsdiff.
- Optional experimental data format aware algorithm for potentially
smaller patches. I don't recommend anyone to use this functionality
as the gain is small in relation to memory usage and code
complexity!
There is a risk this functionality uses patent
https://patents.google.com/patent/EP1988455B1/en. Anyway, this
patent expires in August 2019 as I understand it.
Supported data formats:
- ARM Cortex-M4
- AArch64
Project homepage: https://github.com/eerimoq/detools
Documentation: http://detools.readthedocs.org/en/latest
Installation
============
.. code-block:: python
pip install detools
Statistics
==========
Patch sizes, memory usage (RSS) and elapsed times when creating a
patch from Python-3.7.3.tar (79M) to Python-3.8.1.tar (84M) for
various algorithm, patch type and compression combinations.
See `tests/benchmark.sh`_ for details on how the data was collected.
+--------------+------------+--------+------------+------+---------+
| Algorithm | Patch type | Compr. | Patch size | RSS | Time |
+==============+============+========+============+======+=========+
| bsdiff | sequential | lzma | 3,5M | 662M | 0:24.29 |
+--------------+------------+--------+------------+------+---------+
| bsdiff | sequential | none | 86M | 646M | 0:15.20 |
+--------------+------------+--------+------------+------+---------+
| hdiffpatch | hdiffpatch | lzma | 2,4M | 523M | 0:13.74 |
+--------------+------------+--------+------------+------+---------+
| hdiffpatch | hdiffpatch | none | 7,2M | 523M | 0:10.24 |
+--------------+------------+--------+------------+------+---------+
| match-blocks | sequential | lzma | 2,9M | 273M | 0:08.57 |
+--------------+------------+--------+------------+------+---------+
| match-blocks | sequential | none | 84M | 273M | 0:01.72 |
+--------------+------------+--------+------------+------+---------+
| match-blocks | hdiffpatch | lzma | 2,6M | 212M | 0:06.07 |
+--------------+------------+--------+------------+------+---------+
| match-blocks | hdiffpatch | none | 9,7M | 212M | 0:01.30 |
+--------------+------------+--------+------------+------+---------+
Same as above, but for MicroPython ESP8266 binary releases (from 604k
to 615k).
+--------------+------------+--------+------------+------+---------+
| Algorithm | Patch type | Compr. | Patch size | RSS | Time |
+==============+============+========+============+======+=========+
| bsdiff | sequential | lzma | 71K | 46M | 0:00.64 |
+--------------+------------+--------+------------+------+---------+
| bsdiff | sequential | none | 609K | 27M | 0:00.33 |
+--------------+------------+--------+------------+------+---------+
| hdiffpatch | hdiffpatch | lzma | 65K | 42M | 0:00.37 |
+--------------+------------+--------+------------+------+---------+
| hdiffpatch | hdiffpatch | none | 123K | 25M | 0:00.32 |
+--------------+------------+--------+------------+------+---------+
| match-blocks | sequential | lzma | 194K | 46M | 0:00.44 |
+--------------+------------+--------+------------+------+---------+
| match-blocks | sequential | none | 606K | 25M | 0:00.22 |
+--------------+------------+--------+------------+------+---------+
| match-blocks | hdiffpatch | lzma | 189K | 43M | 0:00.38 |
+--------------+------------+--------+------------+------+---------+
| match-blocks | hdiffpatch | none | 313K | 24M | 0:00.19 |
+--------------+------------+--------+------------+------+---------+
Example usage
=============
Examples in C are found in `c`_.
Command line tool
-----------------
The create patch subcommand
^^^^^^^^^^^^^^^^^^^^^^^^^^^
Create a patch ``foo.patch`` from ``tests/files/foo/old`` to
``tests/files/foo/new``.
.. code-block:: text
$ detools create_patch tests/files/foo/old tests/files/foo/new foo.patch
Successfully created 'foo.patch' in 0.01 seconds!
$ ls -l foo.patch
-rw-rw-r-- 1 erik erik 127 feb 2 10:35 foo.patch
Create the same patch as above, but without compression.
.. code-block:: text
$ detools create_patch --compression none \
tests/files/foo/old tests/files/foo/new foo-no-compression.patch
Successfully created 'foo-no-compression.patch' in 0 seconds!
$ ls -l foo-no-compression.patch
-rw-rw-r-- 1 erik erik 2792 feb 2 10:35 foo-no-compression.patch
Create a hdiffpatch patch ``foo-hdiffpatch.patch``.
.. code-block:: text
$ detools create_patch --algorithm hdiffpatch --patch-type hdiffpatch \
tests/files/foo/old tests/files/foo/new foo-hdiffpatch.patch
Successfully created patch 'foo-hdiffpatch.patch' in 0.01 seconds!
$ ls -l foo-hdiffpatch.patch
-rw-rw-r-- 1 erik erik 146 feb 2 10:37 foo-hdiffpatch.patch
Lower memory usage with ``--algorithm match-blocks`` algorithm. Mainly
useful for big files. Creates slightly bigger patches than ``bsdiff``
and ``hdiffpatch``.
.. code-block:: text
$ detools create_patch --algorithm match-blocks \
tests/files/foo/old tests/files/foo/new foo-hdiffpatch-64.patch
Successfully created patch 'foo-hdiffpatch-64.patch' in 0.01 seconds!
$ ls -l foo-hdiffpatch-64.patch
-rw-rw-r-- 1 erik erik 404 feb 8 11:03 foo-hdiffpatch-64.patch
Non-sequential but smaller patch with ``--patch-type hdiffpatch``.
.. code-block:: text
$ detools create_patch \
--algorithm match-blocks --patch-type hdiffpatch \
tests/files/foo/old tests/files/foo/new foo-hdiffpatch-sequential.patch
Successfully created 'foo-hdiffpatch-sequential.patch' in 0.01 seconds!
$ ls -l foo-hdiffpatch-sequential.patch
-rw-rw-r-- 1 erik erik 389 feb 8 11:05 foo-hdiffpatch-sequential.patch
The create in-place patch subcommand
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Create an in-place patch ``foo-in-place.patch``.
.. code-block:: text
$ detools create_patch_in_place --memory-size 3000 --segment-size 500 \
tests/files/foo/old tests/files/foo/new foo-in-place.patch
Successfully created 'foo-in-place.patch' in 0.01 seconds!
$ ls -l foo-in-place.patch
-rw-rw-r-- 1 erik erik 672 feb 2 10:36 foo-in-place.patch
The create bsdiff patch subcommand
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Create a bsdiff patch ``foo-bsdiff.patch``, compatible with the
original bsdiff program.
.. code-block:: text
$ detools create_patch_bsdiff \
tests/files/foo/old tests/files/foo/new foo-bsdiff.patch
Successfully created 'foo-bsdiff.patch' in 0 seconds!
$ ls -l foo-bsdiff.patch
-rw-rw-r-- 1 erik erik 261 feb 2 10:36 foo-bsdiff.patch
The apply patch subcommand
^^^^^^^^^^^^^^^^^^^^^^^^^^
Apply the patch ``foo.patch`` to ``tests/files/foo/old`` to create
``foo.new``.
.. code-block:: text
$ detools apply_patch tests/files/foo/old foo.patch foo.new
Successfully created 'foo.new' in 0 seconds!
$ ls -l foo.new
-rw-rw-r-- 1 erik erik 2780 feb 2 10:38 foo.new
The in-place apply patch subcommand
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apply the in-place patch ``foo-in-place.patch`` to ``foo.mem``.
.. code-block:: text
$ cp tests/files/foo/in-place-3000-500.mem foo.mem
$ detools apply_patch_in_place foo.mem foo-in-place.patch
Successfully created 'foo.mem' in 0 seconds!
$ ls -l foo.mem
-rw-rw-r-- 1 erik erik 3000 feb 2 10:40 foo.mem
The bsdiff apply patch subcommand
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Apply the patch ``foo-bsdiff.patch`` to ``tests/files/foo/old`` to
create ``foo.new``.
.. code-block:: text
$ detools apply_patch_bsdiff tests/files/foo/old foo-bsdiff.patch foo.new
Successfully created 'foo.new' in 0 seconds!
$ ls -l foo.new
-rw-rw-r-- 1 erik erik 2780 feb 2 10:41 foo.new
The patch info subcommand
^^^^^^^^^^^^^^^^^^^^^^^^^
Print information about the patch ``foo.patch``.
.. code-block:: text
$ detools patch_info foo.patch
Type: sequential
Patch size: 127 bytes
To size: 2.71 KiB
Patch/to ratio: 4.6 % (lower is better)
Diff/extra ratio: 9828.6 % (higher is better)
Size/data ratio: 0.3 % (lower is better)
Compression: lzma
Number of diffs: 2
Total diff size: 2.69 KiB
Average diff size: 1.34 KiB
Median diff size: 1.34 KiB
Number of extras: 2
Total extra size: 28 bytes
Average extra size: 14 bytes
Median extra size: 14 bytes
Contributing
============
#. Fork the repository.
#. Install prerequisites.
.. code-block:: text
pip install -r requirements.txt
#. Implement the new feature or bug fix.
#. Implement test case(s) to ensure that future changes do not break
legacy.
#. Run the tests.
.. code-block:: text
make test
#. Create a pull request.
.. |nala| image:: https://img.shields.io/badge/nala-test-blue.svg
.. _nala: https://github.com/eerimoq/nala
.. _SA-IS: https://sites.google.com/site/yuta256/sais
.. _HDiffPatch: https://github.com/sisong/HDiffPatch
.. _Incremental apply patch: https://github.com/eerimoq/detools/tree/master/c
.. _delta encoding: https://en.wikipedia.org/wiki/Delta_encoding
.. _heatshrink: https://github.com/atomicobject/heatshrink
.. _Zstandard: https://facebook.github.io/zstd
.. _sequential: https://detools.readthedocs.io/en/latest/#id1
.. _in-place: https://detools.readthedocs.io/en/latest/#id3
.. _c: https://github.com/eerimoq/detools/tree/master/c
.. _tests/benchmark.sh: https://github.com/eerimoq/detools/tree/master/tests/benchmark.sh
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"description": "|nala|_\n\nAbout\n=====\n\nBinary `delta encoding`_ in Python 3.6+ and C.\n\nBased on http://www.daemonology.net/bsdiff/ and `HDiffPatch`_, with\nthe following features:\n\n- bsdiff, hdiffpatch and match-blocks algorithms.\n\n- `sequential`_, hdiffpatch or `in-place`_ (resumable) patch types.\n\n- BZ2, LZ4, LZMA, `Zstandard`_, `heatshrink`_ or CRLE compression.\n\n- Sequential patches allow streaming.\n\n- Maximum file size is 2 GB for the bsdiff algorithm. There is\n practically no limit for the hdiffpatch and match-blocks algorithms.\n\n- `Incremental apply patch`_ implemented in C, suitable for memory\n constrained embedded devices. Only the sequential patch type is\n supported.\n\n- `SA-IS`_ or divsufsort instead of qsufsort for bsdiff.\n\n- Optional experimental data format aware algorithm for potentially\n smaller patches. I don't recommend anyone to use this functionality\n as the gain is small in relation to memory usage and code\n complexity!\n\n There is a risk this functionality uses patent\n https://patents.google.com/patent/EP1988455B1/en. Anyway, this\n patent expires in August 2019 as I understand it.\n\n Supported data formats:\n\n - ARM Cortex-M4\n\n - AArch64\n\nProject homepage: https://github.com/eerimoq/detools\n\nDocumentation: http://detools.readthedocs.org/en/latest\n\nInstallation\n============\n\n.. code-block:: python\n\n pip install detools\n\nStatistics\n==========\n\nPatch sizes, memory usage (RSS) and elapsed times when creating a\npatch from Python-3.7.3.tar (79M) to Python-3.8.1.tar (84M) for\nvarious algorithm, patch type and compression combinations.\n\nSee `tests/benchmark.sh`_ for details on how the data was collected.\n\n+--------------+------------+--------+------------+------+---------+\n| Algorithm | Patch type | Compr. | Patch size | RSS | Time |\n+==============+============+========+============+======+=========+\n| bsdiff | sequential | lzma | 3,5M | 662M | 0:24.29 |\n+--------------+------------+--------+------------+------+---------+\n| bsdiff | sequential | none | 86M | 646M | 0:15.20 |\n+--------------+------------+--------+------------+------+---------+\n| hdiffpatch | hdiffpatch | lzma | 2,4M | 523M | 0:13.74 |\n+--------------+------------+--------+------------+------+---------+\n| hdiffpatch | hdiffpatch | none | 7,2M | 523M | 0:10.24 |\n+--------------+------------+--------+------------+------+---------+\n| match-blocks | sequential | lzma | 2,9M | 273M | 0:08.57 |\n+--------------+------------+--------+------------+------+---------+\n| match-blocks | sequential | none | 84M | 273M | 0:01.72 |\n+--------------+------------+--------+------------+------+---------+\n| match-blocks | hdiffpatch | lzma | 2,6M | 212M | 0:06.07 |\n+--------------+------------+--------+------------+------+---------+\n| match-blocks | hdiffpatch | none | 9,7M | 212M | 0:01.30 |\n+--------------+------------+--------+------------+------+---------+\n\nSame as above, but for MicroPython ESP8266 binary releases (from 604k\nto 615k).\n\n+--------------+------------+--------+------------+------+---------+\n| Algorithm | Patch type | Compr. | Patch size | RSS | Time |\n+==============+============+========+============+======+=========+\n| bsdiff | sequential | lzma | 71K | 46M | 0:00.64 |\n+--------------+------------+--------+------------+------+---------+\n| bsdiff | sequential | none | 609K | 27M | 0:00.33 |\n+--------------+------------+--------+------------+------+---------+\n| hdiffpatch | hdiffpatch | lzma | 65K | 42M | 0:00.37 |\n+--------------+------------+--------+------------+------+---------+\n| hdiffpatch | hdiffpatch | none | 123K | 25M | 0:00.32 |\n+--------------+------------+--------+------------+------+---------+\n| match-blocks | sequential | lzma | 194K | 46M | 0:00.44 |\n+--------------+------------+--------+------------+------+---------+\n| match-blocks | sequential | none | 606K | 25M | 0:00.22 |\n+--------------+------------+--------+------------+------+---------+\n| match-blocks | hdiffpatch | lzma | 189K | 43M | 0:00.38 |\n+--------------+------------+--------+------------+------+---------+\n| match-blocks | hdiffpatch | none | 313K | 24M | 0:00.19 |\n+--------------+------------+--------+------------+------+---------+\n\nExample usage\n=============\n\nExamples in C are found in `c`_.\n\nCommand line tool\n-----------------\n\nThe create patch subcommand\n^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nCreate a patch ``foo.patch`` from ``tests/files/foo/old`` to\n``tests/files/foo/new``.\n\n.. code-block:: text\n\n $ detools create_patch tests/files/foo/old tests/files/foo/new foo.patch\n Successfully created 'foo.patch' in 0.01 seconds!\n $ ls -l foo.patch\n -rw-rw-r-- 1 erik erik 127 feb 2 10:35 foo.patch\n\nCreate the same patch as above, but without compression.\n\n.. code-block:: text\n\n $ detools create_patch --compression none \\\n tests/files/foo/old tests/files/foo/new foo-no-compression.patch\n Successfully created 'foo-no-compression.patch' in 0 seconds!\n $ ls -l foo-no-compression.patch\n -rw-rw-r-- 1 erik erik 2792 feb 2 10:35 foo-no-compression.patch\n\nCreate a hdiffpatch patch ``foo-hdiffpatch.patch``.\n\n.. code-block:: text\n\n $ detools create_patch --algorithm hdiffpatch --patch-type hdiffpatch \\\n tests/files/foo/old tests/files/foo/new foo-hdiffpatch.patch\n Successfully created patch 'foo-hdiffpatch.patch' in 0.01 seconds!\n $ ls -l foo-hdiffpatch.patch\n -rw-rw-r-- 1 erik erik 146 feb 2 10:37 foo-hdiffpatch.patch\n\nLower memory usage with ``--algorithm match-blocks`` algorithm. Mainly\nuseful for big files. Creates slightly bigger patches than ``bsdiff``\nand ``hdiffpatch``.\n\n.. code-block:: text\n\n $ detools create_patch --algorithm match-blocks \\\n tests/files/foo/old tests/files/foo/new foo-hdiffpatch-64.patch\n Successfully created patch 'foo-hdiffpatch-64.patch' in 0.01 seconds!\n $ ls -l foo-hdiffpatch-64.patch\n -rw-rw-r-- 1 erik erik 404 feb 8 11:03 foo-hdiffpatch-64.patch\n\nNon-sequential but smaller patch with ``--patch-type hdiffpatch``.\n\n.. code-block:: text\n\n $ detools create_patch \\\n --algorithm match-blocks --patch-type hdiffpatch \\\n tests/files/foo/old tests/files/foo/new foo-hdiffpatch-sequential.patch\n Successfully created 'foo-hdiffpatch-sequential.patch' in 0.01 seconds!\n $ ls -l foo-hdiffpatch-sequential.patch\n -rw-rw-r-- 1 erik erik 389 feb 8 11:05 foo-hdiffpatch-sequential.patch\n\nThe create in-place patch subcommand\n^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nCreate an in-place patch ``foo-in-place.patch``.\n\n.. code-block:: text\n\n $ detools create_patch_in_place --memory-size 3000 --segment-size 500 \\\n tests/files/foo/old tests/files/foo/new foo-in-place.patch\n Successfully created 'foo-in-place.patch' in 0.01 seconds!\n $ ls -l foo-in-place.patch\n -rw-rw-r-- 1 erik erik 672 feb 2 10:36 foo-in-place.patch\n\nThe create bsdiff patch subcommand\n^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nCreate a bsdiff patch ``foo-bsdiff.patch``, compatible with the\noriginal bsdiff program.\n\n.. code-block:: text\n\n $ detools create_patch_bsdiff \\\n tests/files/foo/old tests/files/foo/new foo-bsdiff.patch\n Successfully created 'foo-bsdiff.patch' in 0 seconds!\n $ ls -l foo-bsdiff.patch\n -rw-rw-r-- 1 erik erik 261 feb 2 10:36 foo-bsdiff.patch\n\nThe apply patch subcommand\n^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nApply the patch ``foo.patch`` to ``tests/files/foo/old`` to create\n``foo.new``.\n\n.. code-block:: text\n\n $ detools apply_patch tests/files/foo/old foo.patch foo.new\n Successfully created 'foo.new' in 0 seconds!\n $ ls -l foo.new\n -rw-rw-r-- 1 erik erik 2780 feb 2 10:38 foo.new\n\nThe in-place apply patch subcommand\n^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nApply the in-place patch ``foo-in-place.patch`` to ``foo.mem``.\n\n.. code-block:: text\n\n $ cp tests/files/foo/in-place-3000-500.mem foo.mem\n $ detools apply_patch_in_place foo.mem foo-in-place.patch\n Successfully created 'foo.mem' in 0 seconds!\n $ ls -l foo.mem\n -rw-rw-r-- 1 erik erik 3000 feb 2 10:40 foo.mem\n\nThe bsdiff apply patch subcommand\n^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\nApply the patch ``foo-bsdiff.patch`` to ``tests/files/foo/old`` to\ncreate ``foo.new``.\n\n.. code-block:: text\n\n $ detools apply_patch_bsdiff tests/files/foo/old foo-bsdiff.patch foo.new\n Successfully created 'foo.new' in 0 seconds!\n $ ls -l foo.new\n -rw-rw-r-- 1 erik erik 2780 feb 2 10:41 foo.new\n\nThe patch info subcommand\n^^^^^^^^^^^^^^^^^^^^^^^^^\n\nPrint information about the patch ``foo.patch``.\n\n.. code-block:: text\n\n $ detools patch_info foo.patch\n Type: sequential\n Patch size: 127 bytes\n To size: 2.71 KiB\n Patch/to ratio: 4.6 % (lower is better)\n Diff/extra ratio: 9828.6 % (higher is better)\n Size/data ratio: 0.3 % (lower is better)\n Compression: lzma\n\n Number of diffs: 2\n Total diff size: 2.69 KiB\n Average diff size: 1.34 KiB\n Median diff size: 1.34 KiB\n\n Number of extras: 2\n Total extra size: 28 bytes\n Average extra size: 14 bytes\n Median extra size: 14 bytes\n\nContributing\n============\n\n#. Fork the repository.\n\n#. Install prerequisites.\n\n .. code-block:: text\n\n pip install -r requirements.txt\n\n#. Implement the new feature or bug fix.\n\n#. Implement test case(s) to ensure that future changes do not break\n legacy.\n\n#. Run the tests.\n\n .. code-block:: text\n\n make test\n\n#. Create a pull request.\n\n.. |nala| image:: https://img.shields.io/badge/nala-test-blue.svg\n.. _nala: https://github.com/eerimoq/nala\n\n.. _SA-IS: https://sites.google.com/site/yuta256/sais\n\n.. _HDiffPatch: https://github.com/sisong/HDiffPatch\n\n.. _Incremental apply patch: https://github.com/eerimoq/detools/tree/master/c\n\n.. _delta encoding: https://en.wikipedia.org/wiki/Delta_encoding\n\n.. _heatshrink: https://github.com/atomicobject/heatshrink\n\n.. _Zstandard: https://facebook.github.io/zstd\n\n.. _sequential: https://detools.readthedocs.io/en/latest/#id1\n\n.. _in-place: https://detools.readthedocs.io/en/latest/#id3\n\n.. _c: https://github.com/eerimoq/detools/tree/master/c\n\n.. _tests/benchmark.sh: https://github.com/eerimoq/detools/tree/master/tests/benchmark.sh\n",
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