Mercurial > octave
view liboctave/util/byte-swap.h @ 31198:863730dd0f83 stable
nextpow2: Fix for input between 0.5 and 1 (bug #62947).
* scripts/general/nextpow2.m: Switch to a naïve implementation using log2 with
a single output argument and ceil.
author | Markus Mützel <markus.muetzel@gmx.de> |
---|---|
date | Wed, 24 Aug 2022 17:15:34 +0200 |
parents | 796f54d4ddbf |
children | 597f3ee61a48 |
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//////////////////////////////////////////////////////////////////////// // // Copyright (C) 1996-2022 The Octave Project Developers // // See the file COPYRIGHT.md in the top-level directory of this // distribution or <https://octave.org/copyright/>. // // This file is part of Octave. // // Octave is free software: you can redistribute it and/or modify it // under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // Octave is distributed in the hope that it will be useful, but // WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with Octave; see the file COPYING. If not, see // <https://www.gnu.org/licenses/>. // //////////////////////////////////////////////////////////////////////// #if ! defined (octave_byte_swap_h) #define octave_byte_swap_h 1 #include "octave-config.h" static inline void swap_bytes (void *ptr, unsigned int i, unsigned int j) { char *t = static_cast<char *> (ptr); char tmp = t[i]; t[i] = t[j]; t[j] = tmp; } template <int n> void swap_bytes (void *ptr) { for (int i = 0; i < n/2; i++) swap_bytes (ptr, i, n-1-i); } template <> inline void swap_bytes<1> (void *) { } template <> inline void swap_bytes<2> (void *ptr) { swap_bytes (ptr, 0, 1); } template <> inline void swap_bytes<4> (void *ptr) { swap_bytes (ptr, 0, 3); swap_bytes (ptr, 1, 2); } template <> inline void swap_bytes<8> (void *ptr) { swap_bytes (ptr, 0, 7); swap_bytes (ptr, 1, 6); swap_bytes (ptr, 2, 5); swap_bytes (ptr, 3, 4); } template <int n> void swap_bytes (void *ptr, int len) { char *t = static_cast<char *> (ptr); for (int i = 0; i < len; i++) { swap_bytes<n> (t); t += n; } } template <> inline void swap_bytes<1> (void *, int) { } #endif