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  1.  
  2. #include <stdio.h>
  3. #include <stdint.h>
  4.  
  5. struct __attribute__((packed)) cg_api_packet_header {
  6.  
  7. 	/// The API version (1 - 15; 4 bits).
  8. 	uint32_t version : 4;
  9.  
  10. 	/// Whether the packet carries error information (1 bit).
  11. 	uint32_t error_flag : 1;
  12.  
  13. 	/// The payload size (0 - 2047; 11 bits).
  14. 	uint32_t payload_size : 11;
  15.  
  16. 	/// The message identifier (0 - 16383; 14 bits).
  17. 	uint32_t message_id : 14;
  18.  
  19. 	/// The timestamp in milliseconds (0 - 999; 10 bits).
  20. 	uint32_t timestamp_milliseconds : 10;
  21.  
  22. 	/// The timestamp in seconds (32 bits).
  23. 	uint32_t timestamp_seconds : 32;
  24.  
  25. };
  26.  
  27. int main(void) {
  28.  
  29. 	struct cg_api_packet_header header = {
  30. 		.version = 4,
  31. 		.error_flag = 1,
  32. 		.payload_size = 123,
  33. 		.message_id = 247,
  34. 		.timestamp_milliseconds = 0,
  35. 		.timestamp_seconds = 111,
  36. 	};
  37.  
  38. 	uint8_t* ptr = (uint8_t*)(&header);
  39.  
  40. 	printf("%02hhX %02hhX %02hhX %02hhX %02hhX %02hhX %02hhX %02hhX %02hhX", ptr[0], ptr[1], ptr[2], ptr[3], ptr[4], ptr[5], ptr[6], ptr[7], ptr[8]);
  41.  
  42. }
  43.  
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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74 0F F7 00 00 6F 00 00 00
https://ideone.com/m6ZnXZ
language:
C (gcc 8.3)
created:
19 hours ago
visibility:
public

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