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  1. import std.algorithm; // For reverse
  2.  
  3. void main() {
  4.     ubyte[] littleEndian = [ 68, 135, 133, 10 ];
  5.     auto bigEndian = littleEndian.dup;
  6.     bigEndian.reverse();
  7.  
  8.     union Fake {
  9.         int i;
  10.         ubyte[4] b;
  11.     }
  12.     Fake f;
  13.  
  14.     f.i = 176_523_076;
  15.     assert(f.b == littleEndian); // Machine is Little
  16.  
  17.     // Little Endian data
  18.     f.i = little(littleEndian);
  19.     // Converts to machine native
  20.     assert(f.b == littleEndian);
  21.  
  22.     // Big Endian data
  23.     f.i = big(bigEndian);
  24.     // Converts to machine native
  25.     assert(f.b == littleEndian);
  26.  
  27.     ubyte[] madeBig; // Want Big Endian Here
  28.     f.b = littleEndian; // first int in Little Endian
  29.     madeBig = machineDependant(f.i);
  30.     assert(madeBig == bigEndian); // Converted to Big Endian
  31.     f.b = bigEndian; // second int in Big Endian
  32.     madeBig = machineDependant(f.i);
  33.     assert(madeBig == bigEndian); // Fail Convert to Big Endian
  34.  
  35. }
  36.  
  37. int little(ubyte[] data) {
  38.     return (data[0]<<0) | (data[1]<<8) | (data[2]<<16) | (data[3]<<24);
  39. }
  40. int big(ubyte[] data) {
  41.     return (data[3]<<0) | (data[2]<<8) | (data[1]<<16) | (data[0]<<24);
  42. }
  43. ubyte[] machineDependant(int guida) {
  44.     auto uuid = new ubyte[4];
  45.  
  46.     uuid[0] = (guida>>24)&0xff;
  47.     uuid[1] = (guida>>16)&0xff;
  48.     uuid[2] = (guida>>8)&0xff;
  49.     uuid[3] = (guida>>0)&0xff;
  50.     return uuid;
  51. }
Runtime error #stdin #stdout 0.01s 2100KB
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Standard input is empty
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Standard output is empty
https://ideone.com/5fmiAg
language:
D (dmd 2.085.0)
created:
11 years ago
visibility:
public

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