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  1. #include <string.h>
  2. #include <stdint.h>
  3. #include <stdio.h>
  4. #include <stdlib.h>
  5. #include <assert.h>
  6.  
  7. /*
  8. [20:18:40]{main}z@w:/tmp
  9. $ gcc -std=c11 src.c -o src && ./src pack 1 0 1 0 1 0
  10. 8324
  11. [20:18:43]{main}z@w:/tmp
  12. $ gcc -std=c11 src.c -o src && ./src unpack 8324
  13. SignalPower=1   WorkingGroup=0  IsBlocked=1     ChargeLevel=0   HasVideoCall=1  ConnectionType=0
  14.  
  15. */
  16.  
  17. struct __attribute__((packed)) TMobileIdentifier {
  18. 	unsigned int ConnectionType : 2;
  19. 	unsigned int HasVideoCall : 1;
  20. 	unsigned int ChargeLevel : 3;
  21. 	unsigned int Reserved6 : 1;
  22. 	unsigned int IsBlocked : 1;
  23. 	unsigned int Reserved8 : 1;
  24. 	unsigned int WorkingGroup : 4;
  25. 	unsigned int SignalPower : 3;
  26. };
  27.  
  28. void die(const char* msg) {
  29. 	fprintf(stderr, "%s\n", msg);
  30. 	exit(1);
  31. }
  32.  
  33. void shift(int* argc, char*** argv) {
  34. 	if (*argc == 0) {
  35. 		die("no arguments left to shift");
  36. 	}
  37. 	(*argc)--;
  38. 	(*argv)++;
  39. }
  40.  
  41. #define $0 argv[0]
  42. #define $1 argv[1]
  43. #define $2 argv[2]
  44. #define $3 argv[3]
  45. #define $4 argv[4]
  46. #define $5 argv[5]
  47.  
  48. void usage() {
  49. 	die("Usage: packer [pack|unpack] ...args");
  50. }
  51.  
  52. int main(int argc, char** argv) {
  53. 	assert(sizeof(struct TMobileIdentifier) <= sizeof(uint16_t) &&
  54. 		"TMobileIdentifier doesn't fit into uint16_t"
  55. 	);
  56.  
  57. 	if (argc == 1) {
  58. 		usage();
  59. 	}
  60. 	shift(&argc, &argv);
  61.  
  62. 	if (!strcmp($0, "pack")) {
  63. 		shift(&argc, &argv);
  64. 		if (argc != 6) {
  65. 			die("Usage: packer pack SIGNAL_POWER WORKING_GROUP IS_BLOCKED CHARGE_LEVEL HAS_VIDEO_CALL CONNECTION_TYPE");
  66. 		}
  67. 		struct TMobileIdentifier data = {};
  68. 		data.SignalPower = atoi($0);
  69. 		data.WorkingGroup = atoi($1);
  70. 		data.IsBlocked = atoi($2);
  71. 		data.ChargeLevel = atoi($3);
  72. 		data.HasVideoCall = atoi($4);
  73. 		data.ConnectionType = atoi($5);
  74. 		uint16_t encoded = 0;
  75. 		memcpy(&encoded, &data, sizeof(data));
  76. 		fprintf(stdout, "%u\n", encoded);
  77. 	} else if (!strcmp($0, "unpack")) {
  78. 		shift(&argc, &argv);
  79. 		if (argc != 1) {
  80. 			die("Usage: packer unpack NUMBER");
  81. 		}
  82. 		uint16_t input = atoi($0);
  83. 		struct TMobileIdentifier decoded;
  84. 		memcpy(&decoded, &input, sizeof(input));
  85. 		#define OUTPUT_FIELD(NAME) #NAME, decoded.NAME
  86. 		fprintf(stdout, "%s=%u\t%s=%u\t%s=%u\t%s=%u\t%s=%u\t%s=%u\n",
  87. 			OUTPUT_FIELD(SignalPower),
  88. 			OUTPUT_FIELD(WorkingGroup),
  89. 			OUTPUT_FIELD(IsBlocked),
  90. 			OUTPUT_FIELD(ChargeLevel),
  91. 			OUTPUT_FIELD(HasVideoCall),
  92. 			OUTPUT_FIELD(ConnectionType)
  93. 		);
  94. 		#undef OUTPUT_FIELD
  95. 	} else {
  96. 		usage();
  97. 	}
  98. }
Runtime error #stdin #stdout #stderr 0s 2164KB
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Standard input is empty
stdout
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Standard output is empty
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Usage: packer [pack|unpack] ...args
https://ideone.com/A5Snin
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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