#ifndef ucoo_utils_bytes_hh #define ucoo_utils_bytes_hh // ucoolib - Microcontroller object oriented library. {{{ // // Copyright (C) 2013 Nicolas Schodet // // 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. // // }}} namespace ucoo { /// Pack two bytes to one 16 bit word. static inline uint16_t bytes_pack (uint8_t b1, uint8_t b0) { return b1 << 8 | b0; } /// Pack four bytes to one 32 bit word. static inline uint32_t bytes_pack (uint8_t b3, uint8_t b2, uint8_t b1, uint8_t b0) { return b3 << 24 | b2 << 16 | b1 << 8 | b0; } /// Pack a number of bytes to one word of any size, little endian. template static inline T bytes_pack (const uint8_t *b) { struct pack_struct { T value; } __attribute__ ((packed)); return reinterpret_cast (b)->value; } /// Pack a number of bytes to one word of any size, little endian, char /// version. template static inline T bytes_pack (const char *b) { return bytes_pack (reinterpret_cast (b)); } /// Unpack one byte from one 32 bit word. static inline uint8_t bytes_unpack (uint32_t w, int n) { return (w >> (n * 8)) & 0xff; } /// Unpack a word of any size to a number of bytes, little endian. template static inline void bytes_unpack (uint8_t *b, T value) { struct pack_struct { T value; } __attribute__ ((packed, aligned(1))); reinterpret_cast (b)->value = value; } /// Unpack a word of any size to a number of bytes, little endian, char /// version template static inline void bytes_unpack (char *b, T value) { bytes_unpack (reinterpret_cast (b), value); } } // namespace ucoo #endif // ucoo_utils_bytes_hh