Line data    Source code

       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             : 
      25             : static inline uint16_t EndianSwap16(uint16_t value) {
      26             :   return (uint16_t)((value >> 8) | (value << 8));
      27             : }
      28             : 
      29           0 : static inline int32_t EndianSwap32(int32_t value) {
      30           0 :   return (((value & 0x000000ff) << 24) |
      31           0 :           ((value & 0x0000ff00) <<  8) |
      32           0 :           ((value & 0x00ff0000) >>  8) |
      33           0 :           ((value & 0xff000000) >> 24));
      34             : }
      35             : 
      36             : static 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_