1 /* 2 * Copyright 2011 Google Inc. All Rights Reserved. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SFNTLY_CPP_SRC_SFNTLY_PORT_ENDIAN_H_ 18 #define SFNTLY_CPP_SRC_SFNTLY_PORT_ENDIAN_H_ 19 20 #include "sfntly/port/config.h" 21 #include "sfntly/port/type.h" 22 23 namespace sfntly { 24 EndianSwap16(uint16_t value)25static inline uint16_t EndianSwap16(uint16_t value) { 26 return (uint16_t)((value >> 8) | (value << 8)); 27 } 28 EndianSwap32(int32_t value)29static inline int32_t EndianSwap32(int32_t value) { 30 return (((value & 0x000000ff) << 24) | 31 ((value & 0x0000ff00) << 8) | 32 ((value & 0x00ff0000) >> 8) | 33 ((value & 0xff000000) >> 24)); 34 } 35 EndianSwap64(uint64_t value)36static inline uint64_t EndianSwap64(uint64_t value) { 37 return (((value & 0x00000000000000ffLL) << 56) | 38 ((value & 0x000000000000ff00LL) << 40) | 39 ((value & 0x0000000000ff0000LL) << 24) | 40 ((value & 0x00000000ff000000LL) << 8) | 41 ((value & 0x000000ff00000000LL) >> 8) | 42 ((value & 0x0000ff0000000000LL) >> 24) | 43 ((value & 0x00ff000000000000LL) >> 40) | 44 ((value & 0xff00000000000000LL) >> 56)); 45 } 46 47 #ifdef SFNTLY_LITTLE_ENDIAN 48 #define ToBE16(n) EndianSwap16(n) 49 #define ToBE32(n) EndianSwap32(n) 50 #define ToBE64(n) EndianSwap64(n) 51 #define ToLE16(n) (n) 52 #define ToLE32(n) (n) 53 #define ToLE64(n) (n) 54 #define FromBE16(n) EndianSwap16(n) 55 #define FromBE32(n) EndianSwap32(n) 56 #define FromBE64(n) EndianSwap64(n) 57 #define FromLE16(n) (n) 58 #define FromLE32(n) (n) 59 #define FromLE64(n) (n) 60 #else // SFNTLY_BIG_ENDIAN 61 #define ToBE16(n) (n) 62 #define ToBE32(n) (n) 63 #define ToBE64(n) (n) 64 #define ToLE16(n) EndianSwap16(n) 65 #define ToLE32(n) EndianSwap32(n) 66 #define ToLE64(n) EndianSwap64(n) 67 #define FromBE16(n) (n) 68 #define FromBE32(n) (n) 69 #define FromBE64(n) (n) 70 #define FromLE16(n) EndianSwap16(n) 71 #define FromLE32(n) EndianSwap32(n) 72 #define FromLE64(n) EndianSwap64(n) 73 #endif 74 75 } // namespace sfntly 76 77 #endif // SFNTLY_CPP_SRC_SFNTLY_PORT_ENDIAN_H_ 78