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Reader and writer implementations for the file formats used by kameris-backend.

Project description

kameris-formats

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These are implementations of readers and writers for the file formats used by kameris-backend, for the following languages:

Language Location Notes
C++ cpp/ Header-only, requires libkameris
Python python/ On PyPI: PyPI version

File formats

There are two different file formats used to store program output. repr mode generates files with the extension .mm-repr and dist mode generates files with the extension .mm-dist.

Data is always stored in little-endian format. All header values except the signature are unsigned integers.

element_type is a common enum used to specify the type of the stored data. Its values are as follows:

Value Name Element size (bytes) Description
0 uint8 1 8-bit unsigned integer
1 uint16 2 16-bit unsigned integer
2 uint32 4 32-bit unsigned integer
3 uint64 8 64-bit unsigned integer
4 float32 4 IEEE 754 single-precision floating point
5 float64 8 IEEE 754 double-precision floating point

repr format (.mm-repr files)

Header

Start End Size (bytes) Name Description
0x00 0x05 6 signature File signature, always "MMREPR"
0x06 0x06 1 version Always 0
0x07 0x07 1 is_sparse Whether the matrices are sparse (0 or 1)
0x08 0x08 1 key_type The type of matrix keys as an element_type, unused if is_sparse is 0
0x09 0x09 1 value_type The type of matrix values as an element_type
0x0A 0x11 8 count Number of matrices
0x12 0x19 8 rows Number of rows for each matrix
0x1A 0x21 8 columns Number of columns for each matrix
0x22 8 * count sizes (Only if is_sparse is 1) Number of non-zero entries for each matrix

If the sparse flag is not set, the following count * rows * columns * (size for value_type) bytes are the entries, in row-major order, for each of the count matrices, one after the other.

If the sparse flag is set, each of the count matrices, one after the other, is stored as (the matrix size from sizes) * (size for key_type) * (size for value_type) bytes which are (the matrix size from sizes) pairs of key followed by value. The order of keys is unspecified.

dist format (.mm-dist files)

Header

Start End Size (bytes) Name Description
0x00 0x05 6 signature File signature, always "MMDIST"
0x06 0x06 1 version Always 0
0x07 0x07 1 value_type The type of matrix values as an element_type
0x08 0x0F 8 size Number of rows = columns of the matrix

The following (size * (size - 1)) / 2 * (size for value_type) bytes are the entries above the main diagonal, in row-major order, of the matrix. The matrix is assumed to be symmetric and have zeros on the main diagonal.


License License

The MIT License (MIT)

Copyright (c) 2017 Stephen

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

Project details


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Files for kameris-formats, version 1.0.6
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Filename, size kameris_formats-1.0.6-py2.py3-none-any.whl (7.7 kB) File type Wheel Python version py2.py3 Upload date Hashes View hashes
Filename, size kameris-formats-1.0.6.tar.gz (5.6 kB) File type Source Python version None Upload date Hashes View hashes

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