From a095315b3c31f7a419baceac82c26c3c5ac0cd12 Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Tue, 9 Jun 2015 14:27:33 +0200 Subject: build-sys: split internal basic/ library from shared/ basic/ can be used by everything cannot use anything outside of basic/ libsystemd/ can use basic/ cannot use shared/ shared/ can use libsystemd/ --- src/basic/unaligned.h | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 src/basic/unaligned.h (limited to 'src/basic/unaligned.h') diff --git a/src/basic/unaligned.h b/src/basic/unaligned.h new file mode 100644 index 0000000000..d6181dd9a9 --- /dev/null +++ b/src/basic/unaligned.h @@ -0,0 +1,66 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +#pragma once + +/*** + This file is part of systemd. + + Copyright 2014 Tom Gundersen + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see . +***/ + +#include + +static inline uint16_t unaligned_read_be16(const void *_u) { + const uint8_t *u = _u; + + return (((uint16_t) u[0]) << 8) | + ((uint16_t) u[1]); +} + +static inline uint32_t unaligned_read_be32(const void *_u) { + const uint8_t *u = _u; + + return (((uint32_t) unaligned_read_be16(u)) << 16) | + ((uint32_t) unaligned_read_be16(u + 2)); +} + +static inline uint64_t unaligned_read_be64(const void *_u) { + const uint8_t *u = _u; + + return (((uint64_t) unaligned_read_be32(u)) << 32) | + ((uint64_t) unaligned_read_be32(u + 4)); +} + +static inline void unaligned_write_be16(void *_u, uint16_t a) { + uint8_t *u = _u; + + u[0] = (uint8_t) (a >> 8); + u[1] = (uint8_t) a; +} + +static inline void unaligned_write_be32(void *_u, uint32_t a) { + uint8_t *u = _u; + + unaligned_write_be16(u, (uint16_t) (a >> 16)); + unaligned_write_be16(u + 2, (uint16_t) a); +} + +static inline void unaligned_write_be64(void *_u, uint64_t a) { + uint8_t *u = _u; + + unaligned_write_be32(u, (uint32_t) (a >> 32)); + unaligned_write_be32(u + 4, (uint32_t) a); +} -- cgit v1.2.3-54-g00ecf