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author | Juan J. Martinez <jjm@usebox.net> | 2021-01-09 09:01:05 +0000 |
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committer | Juan J. Martinez <jjm@usebox.net> | 2021-01-09 09:01:05 +0000 |
commit | 9bcf1e97960c0da7322a868efdbc07e2650716fe (patch) | |
tree | de6d32ad5b0e567991bd3eb262902c15a77074d9 /tools/apultra/src/libdivsufsort/README.md | |
parent | 3b31adf01305e522f7e28c1435fb47418ce43267 (diff) | |
download | ubox-msx-lib-9bcf1e97960c0da7322a868efdbc07e2650716fe.tar.gz ubox-msx-lib-9bcf1e97960c0da7322a868efdbc07e2650716fe.zip |
Extra libs: ap.lib
aPLib support with apultra.
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diff --git a/tools/apultra/src/libdivsufsort/README.md b/tools/apultra/src/libdivsufsort/README.md new file mode 100644 index 0000000..381a188 --- /dev/null +++ b/tools/apultra/src/libdivsufsort/README.md @@ -0,0 +1,140 @@ +# libdivsufsort + +libdivsufsort is a software library that implements a lightweight suffix array construction algorithm. + +## News +* 2015-03-21: The project has moved from [Google Code](http://code.google.com/p/libdivsufsort/) to [GitHub](https://github.com/y-256/libdivsufsort) + +## Introduction +This library provides a simple and an efficient C API to construct a suffix array and a Burrows-Wheeler transformed string from a given string over a constant-size alphabet. +The algorithm runs in O(n log n) worst-case time using only 5n+O(1) bytes of memory space, where n is the length of +the string. + +## Build requirements +* An ANSI C Compiler (e.g. GNU GCC) +* [CMake](http://www.cmake.org/ "CMake") version 2.4.2 or newer +* CMake-supported build tool + +## Building on GNU/Linux +1. Get the source code from GitHub. You can either + * use git to clone the repository + ``` + git clone https://github.com/y-256/libdivsufsort.git + ``` + * or download a [zip file](../../archive/master.zip) directly +2. Create a `build` directory in the package source directory. +```shell +$ cd libdivsufsort +$ mkdir build +$ cd build +``` +3. Configure the package for your system. +If you want to install to a different location, change the -DCMAKE_INSTALL_PREFIX option. +```shell +$ cmake -DCMAKE_BUILD_TYPE="Release" \ +-DCMAKE_INSTALL_PREFIX="/usr/local" .. +``` +4. Compile the package. +```shell +$ make +``` +5. (Optional) Install the library and header files. +```shell +$ sudo make install +``` + +## API +```c +/* Data types */ +typedef int32_t saint_t; +typedef int32_t saidx_t; +typedef uint8_t sauchar_t; + +/* + * Constructs the suffix array of a given string. + * @param T[0..n-1] The input string. + * @param SA[0..n-1] The output array or suffixes. + * @param n The length of the given string. + * @return 0 if no error occurred, -1 or -2 otherwise. + */ +saint_t +divsufsort(const sauchar_t *T, saidx_t *SA, saidx_t n); + +/* + * Constructs the burrows-wheeler transformed string of a given string. + * @param T[0..n-1] The input string. + * @param U[0..n-1] The output string. (can be T) + * @param A[0..n-1] The temporary array. (can be NULL) + * @param n The length of the given string. + * @return The primary index if no error occurred, -1 or -2 otherwise. + */ +saidx_t +divbwt(const sauchar_t *T, sauchar_t *U, saidx_t *A, saidx_t n); +``` + +## Example Usage +```c +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <divsufsort.h> + +int main() { + // intput data + char *Text = "abracadabra"; + int n = strlen(Text); + int i, j; + + // allocate + int *SA = (int *)malloc(n * sizeof(int)); + + // sort + divsufsort((unsigned char *)Text, SA, n); + + // output + for(i = 0; i < n; ++i) { + printf("SA[%2d] = %2d: ", i, SA[i]); + for(j = SA[i]; j < n; ++j) { + printf("%c", Text[j]); + } + printf("$\n"); + } + + // deallocate + free(SA); + + return 0; +} +``` +See the [examples](examples) directory for a few other examples. + +## Benchmarks +See [Benchmarks](https://github.com/y-256/libdivsufsort/blob/wiki/SACA_Benchmarks.md) page for details. + +## License +libdivsufsort is released under the [MIT license](LICENSE "MIT license"). +> The MIT License (MIT) +> +> Copyright (c) 2003 Yuta Mori All rights reserved. +> +> 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. + +## Author +* Yuta Mori |