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  1. #include <iostream>
  2. #include <sstream>
  3. #include <string>
  4. #include <iomanip>
  5.  
  6. size_t nextUtf8CodepointLen(const char* data)
  7. {
  8.     unsigned char ch = static_cast<unsigned char>(*data);
  9.  
  10.     if ((ch & 0x80) == 0) {
  11.         return 1;
  12.     }
  13.  
  14.     if ((ch & 0xE0) == 0xC0) {
  15.         return 2;
  16.     }
  17.  
  18.     if ((ch & 0xF0) == 0xE0) {
  19.         return 3;
  20.     }
  21.  
  22.     if ((ch & 0xF8) == 0xF0) {
  23.         return 4;
  24.     }
  25.  
  26.    return 0;
  27. }
  28.  
  29. unsigned nextUtf8Codepoint(const char* &data, size_t &data_size)
  30. {
  31. 	if (data_size == 0) return -1;
  32.  
  33. 	unsigned char ch = static_cast<unsigned char>(*data);
  34.     size_t len = nextUtf8CodepointLen(data);
  35.  
  36. 	++data;
  37. 	--data_size;
  38.  
  39. 	if (len < 2) {
  40. 		return (len == 1) ? static_cast<unsigned>(ch) : 0xFFFD;
  41. 	}
  42.  
  43. 	--len;
  44.  
  45.     unsigned cp;
  46.  
  47.     if (len == 1) {
  48.         cp = ch & 0x1F;
  49.     }
  50.     else if (len == 2) {
  51.         cp = ch & 0x0F;
  52.     }
  53.     else {
  54.         cp = ch & 0x07;
  55.     }
  56.  
  57.     if (len > data_size) {
  58. 		data += data_size;
  59. 		data_size = 0;
  60.         return 0xFFFD;
  61.     }
  62.  
  63. 	for(size_t j = 0; j < len; ++j) {
  64. 		ch = static_cast<unsigned char>(data[j]);
  65.  
  66. 		if ((ch & 0xC0) != 0x80) {
  67. 			cp = 0xFFFD;
  68. 			break;
  69. 		}
  70.  
  71. 		cp = (cp << 6) | (ch & 0x3F);
  72. 	}
  73.  
  74. 	data += len;
  75. 	data_size -= len;
  76.  
  77. 	return cp;
  78. }
  79.  
  80. struct Helper {
  81. 	static std::string ToHex(const std::string &input);
  82. };
  83.  
  84. std::string Helper::ToHex(const std::string &input) {
  85. 	const char *data = input.c_str();
  86. 	size_t data_size = input.size();
  87.  
  88.     std::ostringstream oss;
  89. 	unsigned cp;
  90.  
  91. 	while ((cp = nextUtf8Codepoint(data, data_size)) != -1) {
  92.         if (cp > 0xFF) {
  93.             cp = static_cast<unsigned>('?');
  94.         }
  95.         oss << std::hex << std::setw(2) << std::setfill('0') << cp;
  96.     }
  97.  
  98.     return oss.str();
  99. }
  100.  
  101. int main() {
  102. 	std::cout << Helper::ToHex(u8"É");
  103. 	return 0;
  104. }
Success #stdin #stdout 0s 5464KB
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c9
https://ideone.com/LnNPNU
language:
C++ 4.3.2 (gcc-4.3.2)
created:
4 years ago
visibility:
public

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