headers/private/fs_shell/fssh_byte_order.h

   1 /*
   2  * Copyright 2007, Haiku, Inc. All Rights Reserved.
   3  * Distributed under the terms of the MIT License.
   4  */
   5 #ifndef _FSSH_BYTEORDER_H
   6 #define _FSSH_BYTEORDER_H
   7
   8 #include <endian.h>
   9         // platform endian.h
  10
  11
  12 #include "fssh_defs.h"
  13
  14
  15 // swap directions
  16 typedef enum {
  17         FSSH_B_SWAP_HOST_TO_LENDIAN,
  18         FSSH_B_SWAP_HOST_TO_BENDIAN,
  19         FSSH_B_SWAP_LENDIAN_TO_HOST,
  20         FSSH_B_SWAP_BENDIAN_TO_HOST,
  21         FSSH_B_SWAP_ALWAYS
  22 } fssh_swap_action;
  23
  24
  25 // BSD/networking macros
  26 #ifndef fssh_htonl
  27 #       define fssh_htonl(x) FSSH_B_HOST_TO_BENDIAN_INT32(x)
  28 #       define fssh_ntohl(x) FSSH_B_BENDIAN_TO_HOST_INT32(x)
  29 #       define fssh_htons(x) FSSH_B_HOST_TO_BENDIAN_INT16(x)
  30 #       define fssh_ntohs(x) FSSH_B_BENDIAN_TO_HOST_INT16(x)
  31 #endif
  32
  33 // always swap macros
  34 #define FSSH_B_SWAP_DOUBLE(arg)   __fssh_swap_double(arg)
  35 #define FSSH_B_SWAP_FLOAT(arg)    __fssh_swap_float(arg)
  36 #define FSSH_B_SWAP_INT64(arg)    __fssh_swap_int64(arg)
  37 #define FSSH_B_SWAP_INT32(arg)    __fssh_swap_int32(arg)
  38 #define FSSH_B_SWAP_INT16(arg)    __fssh_swap_int16(arg)
  39
  40 #if BYTE_ORDER == __LITTLE_ENDIAN
  41 // Host is little endian
  42
  43 #define FSSH_B_HOST_IS_LENDIAN 1
  44 #define FSSH_B_HOST_IS_BENDIAN 0
  45
  46 // Host native to little endian
  47 #define FSSH_B_HOST_TO_LENDIAN_DOUBLE(arg)      (double)(arg)
  48 #define FSSH_B_HOST_TO_LENDIAN_FLOAT(arg)       (float)(arg)
  49 #define FSSH_B_HOST_TO_LENDIAN_INT64(arg)       (uint64_t)(arg)
  50 #define FSSH_B_HOST_TO_LENDIAN_INT32(arg)       (uint32_t)(arg)
  51 #define FSSH_B_HOST_TO_LENDIAN_INT16(arg)       (uint16_t)(arg)
  52
  53 // Little endian to host native
  54 #define FSSH_B_LENDIAN_TO_HOST_DOUBLE(arg)      (double)(arg)
  55 #define FSSH_B_LENDIAN_TO_HOST_FLOAT(arg)       (float)(arg)
  56 #define FSSH_B_LENDIAN_TO_HOST_INT64(arg)       (uint64_t)(arg)
  57 #define FSSH_B_LENDIAN_TO_HOST_INT32(arg)       (uint32_t)(arg)
  58 #define FSSH_B_LENDIAN_TO_HOST_INT16(arg)       (uint16_t)(arg)
  59
  60 // Host native to big endian
  61 #define FSSH_B_HOST_TO_BENDIAN_DOUBLE(arg)      __fssh_swap_double(arg)
  62 #define FSSH_B_HOST_TO_BENDIAN_FLOAT(arg)       __fssh_swap_float(arg)
  63 #define FSSH_B_HOST_TO_BENDIAN_INT64(arg)       __fssh_swap_int64(arg)
  64 #define FSSH_B_HOST_TO_BENDIAN_INT32(arg)       __fssh_swap_int32(arg)
  65 #define FSSH_B_HOST_TO_BENDIAN_INT16(arg)       __fssh_swap_int16(arg)
  66
  67 // Big endian to host native
  68 #define FSSH_B_BENDIAN_TO_HOST_DOUBLE(arg)      __fssh_swap_double(arg)
  69 #define FSSH_B_BENDIAN_TO_HOST_FLOAT(arg)       __fssh_swap_float(arg)
  70 #define FSSH_B_BENDIAN_TO_HOST_INT64(arg)       __fssh_swap_int64(arg)
  71 #define FSSH_B_BENDIAN_TO_HOST_INT32(arg)       __fssh_swap_int32(arg)
  72 #define FSSH_B_BENDIAN_TO_HOST_INT16(arg)       __fssh_swap_int16(arg)
  73
  74 #else   // BYTE_ORDER
  75 // Host is big endian
  76
  77 #define FSSH_B_HOST_IS_LENDIAN 0
  78 #define FSSH_B_HOST_IS_BENDIAN 1
  79
  80 // Host native to little endian
  81 #define FSSH_B_HOST_TO_LENDIAN_DOUBLE(arg)      __fssh_swap_double(arg)
  82 #define FSSH_B_HOST_TO_LENDIAN_FLOAT(arg)       __fssh_swap_float(arg)
  83 #define FSSH_B_HOST_TO_LENDIAN_INT64(arg)       __fssh_swap_int64(arg)
  84 #define FSSH_B_HOST_TO_LENDIAN_INT32(arg)       __fssh_swap_int32(arg)
  85 #define FSSH_B_HOST_TO_LENDIAN_INT16(arg)       __fssh_swap_int16(arg)
  86
  87 // Little endian to host native
  88 #define FSSH_B_LENDIAN_TO_HOST_DOUBLE(arg)      __fssh_swap_double(arg)
  89 #define FSSH_B_LENDIAN_TO_HOST_FLOAT(arg)       __fssh_swap_float(arg)
  90 #define FSSH_B_LENDIAN_TO_HOST_INT64(arg)       __fssh_swap_int64(arg)
  91 #define FSSH_B_LENDIAN_TO_HOST_INT32(arg)       __fssh_swap_int32(arg)
  92 #define FSSH_B_LENDIAN_TO_HOST_INT16(arg)       __fssh_swap_int16(arg)
  93
  94 // Host native to big endian
  95 #define FSSH_B_HOST_TO_BENDIAN_DOUBLE(arg)      (double)(arg)
  96 #define FSSH_B_HOST_TO_BENDIAN_FLOAT(arg)       (float)(arg)
  97 #define FSSH_B_HOST_TO_BENDIAN_INT64(arg)       (uint64_t)(arg)
  98 #define FSSH_B_HOST_TO_BENDIAN_INT32(arg)       (uint32_t)(arg)
  99 #define FSSH_B_HOST_TO_BENDIAN_INT16(arg)       (uint16_t)(arg)
 100
 101 // Big endian to host native
 102 #define FSSH_B_BENDIAN_TO_HOST_DOUBLE(arg)      (double)(arg)
 103 #define FSSH_B_BENDIAN_TO_HOST_FLOAT(arg)       (float)(arg)
 104 #define FSSH_B_BENDIAN_TO_HOST_INT64(arg)       (uint64_t)(arg)
 105 #define FSSH_B_BENDIAN_TO_HOST_INT32(arg)       (uint32_t)(arg)
 106 #define FSSH_B_BENDIAN_TO_HOST_INT16(arg)       (uint16_t)(arg)
 107
 108 #endif  // BYTE_ORDER
 109
 110
 111 #ifdef __cplusplus
 112 extern "C" {
 113 #endif
 114
 115 extern fssh_status_t fssh_swap_data(fssh_type_code type, void *data,
 116         fssh_size_t length, fssh_swap_action action);
 117 extern bool fssh_is_type_swapped(fssh_type_code type);
 118
 119
 120 // Private implementations
 121 extern double __fssh_swap_double(double arg);
 122 extern float  __fssh_swap_float(float arg);
 123 extern uint64_t __fssh_swap_int64(uint64_t arg);
 124 extern uint32_t __fssh_swap_int32(uint32_t arg);
 125 extern uint16_t __fssh_swap_int16(uint16_t arg);
 126
 127 #ifdef __cplusplus
 128 }
 129 #endif
 130
 131 #endif  // _FSSH_BYTEORDER_H