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1 // Copyright 2007-2010 Baptiste Lepilleur
2 // Distributed under MIT license, or public domain if desired and
3 // recognized in your jurisdiction.
4 // See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
5 
6 #ifndef LIB_JSONCPP_JSON_TOOL_H_INCLUDED
7 #define LIB_JSONCPP_JSON_TOOL_H_INCLUDED
8 
9 /* This header provides common string manipulation support, such as UTF-8,
10  * portable conversion from/to string...
11  *
12  * It is an internal header that must not be exposed.
13  */
14 
15 namespace Json {
16 
17 /// Converts a unicode code-point to UTF-8.
codePointToUTF8(unsigned int cp)18 static inline std::string codePointToUTF8(unsigned int cp) {
19   std::string result;
20 
21   // based on description from http://en.wikipedia.org/wiki/UTF-8
22 
23   if (cp <= 0x7f) {
24     result.resize(1);
25     result[0] = static_cast<char>(cp);
26   } else if (cp <= 0x7FF) {
27     result.resize(2);
28     result[1] = static_cast<char>(0x80 | (0x3f & cp));
29     result[0] = static_cast<char>(0xC0 | (0x1f & (cp >> 6)));
30   } else if (cp <= 0xFFFF) {
31     result.resize(3);
32     result[2] = static_cast<char>(0x80 | (0x3f & cp));
33     result[1] = 0x80 | static_cast<char>((0x3f & (cp >> 6)));
34     result[0] = 0xE0 | static_cast<char>((0xf & (cp >> 12)));
35   } else if (cp <= 0x10FFFF) {
36     result.resize(4);
37     result[3] = static_cast<char>(0x80 | (0x3f & cp));
38     result[2] = static_cast<char>(0x80 | (0x3f & (cp >> 6)));
39     result[1] = static_cast<char>(0x80 | (0x3f & (cp >> 12)));
40     result[0] = static_cast<char>(0xF0 | (0x7 & (cp >> 18)));
41   }
42 
43   return result;
44 }
45 
46 /// Returns true if ch is a control character (in range [0,32[).
isControlCharacter(char ch)47 static inline bool isControlCharacter(char ch) { return ch > 0 && ch <= 0x1F; }
48 
49 enum {
50   /// Constant that specify the size of the buffer that must be passed to
51   /// uintToString.
52   uintToStringBufferSize = 3 * sizeof(LargestUInt) + 1
53 };
54 
55 // Defines a char buffer for use with uintToString().
56 typedef char UIntToStringBuffer[uintToStringBufferSize];
57 
58 /** Converts an unsigned integer to string.
59  * @param value Unsigned interger to convert to string
60  * @param current Input/Output string buffer.
61  *        Must have at least uintToStringBufferSize chars free.
62  */
uintToString(LargestUInt value,char * & current)63 static inline void uintToString(LargestUInt value, char*& current) {
64   *--current = 0;
65   do {
66     *--current = char(value % 10) + '0';
67     value /= 10;
68   } while (value != 0);
69 }
70 
71 /** Change ',' to '.' everywhere in buffer.
72  *
73  * We had a sophisticated way, but it did not work in WinCE.
74  * @see https://github.com/open-source-parsers/jsoncpp/pull/9
75  */
fixNumericLocale(char * begin,char * end)76 static inline void fixNumericLocale(char* begin, char* end) {
77   while (begin < end) {
78     if (*begin == ',') {
79       *begin = '.';
80     }
81     ++begin;
82   }
83 }
84 
85 } // namespace Json {
86 
87 #endif // LIB_JSONCPP_JSON_TOOL_H_INCLUDED
88