comparison: libpurple/protocols/gg/lib/endian.c
libpurple/protocols/gg/lib/endian.c
- changeset 38882
- bea4cc95b40f
- parent 38881
- 25cb836b9cec
- parent 38182
- 783878958371
- child 38883
- 90462fef3dd8
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| 1 /* $Id$ */ | |
| 2 | |
| 3 /* | |
| 4 * (C) Copyright 2001-2010 Wojtek Kaniewski <wojtekka@irc.pl> | |
| 5 * Robert J. Woźny <speedy@ziew.org> | |
| 6 * Arkadiusz Miśkiewicz <arekm@pld-linux.org> | |
| 7 * Tomasz Chiliński <chilek@chilan.com> | |
| 8 * Adam Wysocki <gophi@ekg.chmurka.net> | |
| 9 * | |
| 10 * This program is free software; you can redistribute it and/or modify | |
| 11 * it under the terms of the GNU Lesser General Public License Version | |
| 12 * 2.1 as published by the Free Software Foundation. | |
| 13 * | |
| 14 * This program is distributed in the hope that it will be useful, | |
| 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 17 * GNU Lesser General Public License for more details. | |
| 18 * | |
| 19 * You should have received a copy of the GNU Lesser General Public | |
| 20 * License along with this program; if not, write to the Free Software | |
| 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, | |
| 22 * USA. | |
| 23 */ | |
| 24 | |
| 25 /** | |
| 26 * \file endian.c | |
| 27 * | |
| 28 * \brief Konwersja między różnymi kolejnościami bajtów | |
| 29 */ | |
| 30 | |
| 31 #include "libgadu.h" | |
| 32 #include "internal.h" | |
| 33 | |
| 34 /** | |
| 35 * \internal Zamienia kolejność bajtów w 64-bitowym słowie. | |
| 36 * | |
| 37 * Ze względu na little-endianowość protokołu Gadu-Gadu, na maszynach | |
| 38 * big-endianowych odwraca kolejność bajtów w słowie. | |
| 39 * | |
| 40 * \param x Liczba do zamiany | |
| 41 * | |
| 42 * \return Liczba z odpowiednią kolejnością bajtów | |
| 43 * | |
| 44 * \ingroup helper | |
| 45 */ | |
| 46 uint64_t gg_fix64(uint64_t x) | |
| 47 { | |
| 48 #ifndef GG_CONFIG_BIGENDIAN | |
| 49 return x; | |
| 50 #else | |
| 51 return (uint64_t) | |
| 52 (((x & (uint64_t) 0x00000000000000ffULL) << 56) | | |
| 53 ((x & (uint64_t) 0x000000000000ff00ULL) << 40) | | |
| 54 ((x & (uint64_t) 0x0000000000ff0000ULL) << 24) | | |
| 55 ((x & (uint64_t) 0x00000000ff000000ULL) << 8) | | |
| 56 ((x & (uint64_t) 0x000000ff00000000ULL) >> 8) | | |
| 57 ((x & (uint64_t) 0x0000ff0000000000ULL) >> 24) | | |
| 58 ((x & (uint64_t) 0x00ff000000000000ULL) >> 40) | | |
| 59 ((x & (uint64_t) 0xff00000000000000ULL) >> 56)); | |
| 60 #endif | |
| 61 } | |
| 62 | |
| 63 /** | |
| 64 * \internal Zamienia kolejność bajtów w 32-bitowym słowie. | |
| 65 * | |
| 66 * Ze względu na little-endianowość protokołu Gadu-Gadu, na maszynach | |
| 67 * big-endianowych odwraca kolejność bajtów w słowie. | |
| 68 * | |
| 69 * \param x Liczba do zamiany | |
| 70 * | |
| 71 * \return Liczba z odpowiednią kolejnością bajtów | |
| 72 * | |
| 73 * \ingroup helper | |
| 74 */ | |
| 75 uint32_t gg_fix32(uint32_t x) | |
| 76 { | |
| 77 #ifndef GG_CONFIG_BIGENDIAN | |
| 78 return x; | |
| 79 #else | |
| 80 return (uint32_t) | |
| 81 (((x & (uint32_t) 0x000000ffU) << 24) | | |
| 82 ((x & (uint32_t) 0x0000ff00U) << 8) | | |
| 83 ((x & (uint32_t) 0x00ff0000U) >> 8) | | |
| 84 ((x & (uint32_t) 0xff000000U) >> 24)); | |
| 85 #endif | |
| 86 } | |
| 87 | |
| 88 /** | |
| 89 * \internal Zamienia kolejność bajtów w 16-bitowym słowie. | |
| 90 * | |
| 91 * Ze względu na little-endianowość protokołu Gadu-Gadu, na maszynach | |
| 92 * big-endianowych zamienia kolejność bajtów w słowie. | |
| 93 * | |
| 94 * \param x Liczba do zamiany | |
| 95 * | |
| 96 * \return Liczba z odpowiednią kolejnością bajtów | |
| 97 * | |
| 98 * \ingroup helper | |
| 99 */ | |
| 100 uint16_t gg_fix16(uint16_t x) | |
| 101 { | |
| 102 #ifndef GG_CONFIG_BIGENDIAN | |
| 103 return x; | |
| 104 #else | |
| 105 return (uint16_t) | |
| 106 (((x & (uint16_t) 0x00ffU) << 8) | | |
| 107 ((x & (uint16_t) 0xff00U) >> 8)); | |
| 108 #endif | |
| 109 } |
