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
15namespace Json {
16
17/// Converts a unicode code-point to UTF-8.
18static 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[).
47static inline bool isControlCharacter(char ch) { return ch > 0 && ch <= 0x1F; }
48
49enum {
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().
56typedef 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 */
63static 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 */
76static 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