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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. struct stRequestMsg {
  5.     uint16_t startTag;
  6.     uint32_t messageSize;
  7.     uint16_t messageID;
  8.     uint16_t sequenceNumber;
  9.     uint16_t messageType;
  10.     uint32_t reserved;
  11. };
  12.  
  13. void printIt(struct stRequestMsg m) {
  14. 	printf("{\n"
  15. 	       "  .startTag =       %#x;\n"
  16. 	       "  .messageSize =    %#x;\n"
  17. 	       "  .messageID =      %#x;\n"
  18. 	       "  .sequenceNumber = %#x;\n"
  19. 	       "  .messageType =    %#x;\n"
  20. 	       "  .reserved =       %#x;\n"
  21. 	       "}\n",
  22. 	       m.startTag, m.messageSize, m.messageID,
  23. 	       m.sequenceNumber, m.messageType, m.reserved);
  24. }
  25.  
  26.  
  27. uint16_t deserialize_uint16(char const * const b) {
  28. 	return ((uint16_t) b[0] << 8u) |
  29. 	       ((uint16_t) b[1]);
  30. }
  31. uint32_t deserialize_uint32(char const * const b) {
  32. 	return ((uint16_t) b[0] << 24u) |
  33. 	       ((uint16_t) b[1] << 16u) |
  34. 	       ((uint16_t) b[2] << 8u) |
  35. 	       ((uint16_t) b[3]);
  36. }
  37.  
  38. struct stRequestMsg deserialize(char const * const b) {
  39. 	struct stRequestMsg r;
  40. 	r.startTag = deserialize_uint16(b);
  41. 	r.messageSize = deserialize_uint32(b + 2);
  42. 	r.messageID = deserialize_uint16(b + 6);
  43. 	r.sequenceNumber = deserialize_uint16(b + 8);
  44. 	r.messageType = deserialize_uint16(b + 10);
  45. 	r.reserved = deserialize_uint32(b + 12);
  46. 	return r;
  47. }
  48.  
  49. int main(void) {
  50.   char buff[16];
  51.   buff[0] = 0x50;
  52.   buff[1] = 0x00;
  53.   buff[2] = 0x1E;
  54.   buff[3] = 0x00;
  55.   buff[4] = 0x00;
  56.   buff[5] = 0x00;
  57.   buff[6] = 0x31;
  58.   buff[7] = 0x00;
  59.   buff[8] = 0x10;
  60.   buff[9] = 0x00;
  61.   buff[10] = 0x20;
  62.   buff[11] = 0x00;
  63.   buff[12] = 0x10;
  64.   buff[13] = 0x00;
  65.   buff[14] = 0x00;
  66.   buff[15] = 0x00;
  67.  
  68.   struct stRequestMsg msg = deserialize(&(buff[0]));
  69.   printIt(msg);
  70.   return 0;
  71. }
  72.  
Success #stdin #stdout 0s 2156KB
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stdin
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Standard input is empty
stdout
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{
  .startTag =       0x5000;
  .messageSize =    0x1e000000;
  .messageID =      0x3100;
  .sequenceNumber = 0x1000;
  .messageType =    0x2000;
  .reserved =       0x10000000;
}
https://ideone.com/1gxGeF
Deserialisation example
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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