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37 */
38
39#ifndef COMMON_CONVERT_UTF_H_
40#define COMMON_CONVERT_UTF_H_
41
42/* ---------------------------------------------------------------------
43
44Conversions between UTF32, UTF-16, and UTF-8. Header file.
45
46Several funtions are included here, forming a complete set of
47conversions between the three formats. UTF-7 is not included
48here, but is handled in a separate source file.
49
50Each of these routines takes pointers to input buffers and output
51buffers. The input buffers are const.
52
53Each routine converts the text between *sourceStart and sourceEnd,
54putting the result into the buffer between *targetStart and
55targetEnd. Note: the end pointers are *after* the last item: e.g.
56*(sourceEnd - 1) is the last item.
57
58The return result indicates whether the conversion was successful,
59and if not, whether the problem was in the source or target buffers.
60(Only the first encountered problem is indicated.)
61
62After the conversion, *sourceStart and *targetStart are both
63updated to point to the end of last text successfully converted in
64the respective buffers.
65
66Input parameters:
67sourceStart - pointer to a pointer to the source buffer.
68The contents of this are modified on return so that
69it points at the next thing to be converted.
70targetStart - similarly, pointer to pointer to the target buffer.
71sourceEnd, targetEnd - respectively pointers to the ends of the
72two buffers, for overflow checking only.
73
74These conversion functions take a ConversionFlags argument. When this
75flag is set to strict, both irregular sequences and isolated surrogates
76will cause an error. When the flag is set to lenient, both irregular
77sequences and isolated surrogates are converted.
78
79Whether the flag is strict or lenient, all illegal sequences will cause
80an error return. This includes sequences such as: <F4 90 80 80>, <C0 80>,
81or <A0> in UTF-8, and values above 0x10FFFF in UTF-32. Conformant code
82must check for illegal sequences.
83
84When the flag is set to lenient, characters over 0x10FFFF are converted
85to the replacement character; otherwise (when the flag is set to strict)
86they constitute an error.
87
88Output parameters:
89The value "sourceIllegal" is returned from some routines if the input
90sequence is malformed. When "sourceIllegal" is returned, the source
91value will point to the illegal value that caused the problem. E.g.,
92in UTF-8 when a sequence is malformed, it points to the start of the
93malformed sequence.
94
95Author: Mark E. Davis, 1994.
96Rev History: Rick McGowan, fixes & updates May 2001.
97Fixes & updates, Sept 2001.
98
99------------------------------------------------------------------------ */
100
101/* ---------------------------------------------------------------------
102The following 4 definitions are compiler-specific.
103The C standard does not guarantee that wchar_t has at least
10416 bits, so wchar_t is no less portable than unsigned short!
105All should be unsigned values to avoid sign extension during
106bit mask & shift operations.
107------------------------------------------------------------------------ */
108
109namespace google_breakpad {
110
111typedef unsigned long UTF32; /* at least 32 bits */
112typedef unsigned short UTF16; /* at least 16 bits */
113typedef unsigned char UTF8; /* typically 8 bits */
114typedef unsigned char Boolean; /* 0 or 1 */
115
116/* Some fundamental constants */
117#define UNI_REPLACEMENT_CHAR (UTF32)0x0000FFFD
118#define UNI_MAX_BMP (UTF32)0x0000FFFF
119#define UNI_MAX_UTF16 (UTF32)0x0010FFFF
120#define UNI_MAX_UTF32 (UTF32)0x7FFFFFFF
121#define UNI_MAX_LEGAL_UTF32 (UTF32)0x0010FFFF
122
123typedef enum {
124 conversionOK, /* conversion successful */
125 sourceExhausted, /* partial character in source, but hit end */
126 targetExhausted, /* insuff. room in target for conversion */
127 sourceIllegal /* source sequence is illegal/malformed */
128} ConversionResult;
129
130typedef enum {
131 strictConversion = 0,
132 lenientConversion
133} ConversionFlags;
134
135ConversionResult ConvertUTF8toUTF16 (const UTF8** sourceStart, const UTF8* sourceEnd,
136 UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags);
137
138ConversionResult ConvertUTF16toUTF8 (const UTF16** sourceStart, const UTF16* sourceEnd,
139 UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags);
140
141ConversionResult ConvertUTF8toUTF32 (const UTF8** sourceStart, const UTF8* sourceEnd,
142 UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
143
144ConversionResult ConvertUTF32toUTF8 (const UTF32** sourceStart, const UTF32* sourceEnd,
145 UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags);
146
147ConversionResult ConvertUTF16toUTF32 (const UTF16** sourceStart, const UTF16* sourceEnd,
148 UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
149
150ConversionResult ConvertUTF32toUTF16 (const UTF32** sourceStart, const UTF32* sourceEnd,
151 UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags);
152
153Boolean isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd);
154
155} // namespace google_breakpad
156
157/* --------------------------------------------------------------------- */
158
159#endif // COMMON_CONVERT_UTF_H_
160