GSACA is an algorithm for linear time suffix array construction.

GSACA is a new algorithm for linear time suffix array construction. It runs in O(n) time without use of recursion, using 12n+O(1) bytes of extra working space in addition to the 5n for the suffix array and the text. Performance is rather underwhelming, this is just a sample implementation used for a master thesis, "Linear Suffix Sorting - A new approach for suffix array construction" (to appear) by Uwe Baier.

An ANSI C Compiler (e.g. GNU GCC)

/**
 * constructs the suffix array of the given string S.
 * @param S a nullterminated string of length n, i.e. S[n-1] = '\0'.
 * @param SA an array of size n, where the suffix array will be stored to.
 * @param n length of the string and the suffix array.
 * @return 0 if construction worked, -1 on illegal parameters,
 *	or -2 if not enough memory is available.
 */
int gsaca(const unsigned char *S, int *SA, int n);

/**
 * constructs the suffix array of the given string S.
 * @param S a nullterminated string of length n, i.e. S[n-1] = '\0'.
 * @param SA an array of size n, where the suffix array will be stored to.
 * @param n length of the string and the suffix array.
 * @return 0 if construction worked, -1 on illegal parameters,
 *	or -2 if not enough memory is available.
 */
int gsaca_unsigned(const unsigned char *S, unsigned int *SA, unsigned int n);

GSACA currently performs quite poor compared to state of the art SACAs like libdivsufsort. Moreover, this is an implementation of a SACA for proving its simplicity. However, a little benchmark suite is included for comparing GSACA against common other SACAs.

gsaca is released under the MIT license.

The MIT License (MIT)

Copyright (c) 2015 Uwe Baier 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.

• Uwe Baier