ConvertUTF.h
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1 /*
2  * Copyright 2001-2004 Unicode, Inc.
3  *
4  * Disclaimer
5  *
6  * This source code is provided as is by Unicode, Inc. No claims are
7  * made as to fitness for any particular purpose. No warranties of any
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9  * applicability of information provided. If this file has been
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11  * sole remedy for any claim will be exchange of defective media
12  * within 90 days of receipt.
13  *
14  * Limitations on Rights to Redistribute This Code
15  *
16  * Unicode, Inc. hereby grants the right to freely use the information
17  * supplied in this file in the creation of products supporting the
18  * Unicode Standard, and to make copies of this file in any form
19  * for internal or external distribution as long as this notice
20  * remains attached.
21  */
22 
23 /* ---------------------------------------------------------------------
24 
25  Conversions between UTF32, UTF-16, and UTF-8. Header file.
26 
27  Several funtions are included here, forming a complete set of
28  conversions between the three formats. UTF-7 is not included
29  here, but is handled in a separate source file.
30 
31  Each of these routines takes pointers to input buffers and output
32  buffers. The input buffers are const.
33 
34  Each routine converts the text between *sourceStart and sourceEnd,
35  putting the result into the buffer between *targetStart and
36  targetEnd. Note: the end pointers are *after* the last item: e.g.
37  *(sourceEnd - 1) is the last item.
38 
39  The return result indicates whether the conversion was successful,
40  and if not, whether the problem was in the source or target buffers.
41  (Only the first encountered problem is indicated.)
42 
43  After the conversion, *sourceStart and *targetStart are both
44  updated to point to the end of last text successfully converted in
45  the respective buffers.
46 
47  Input parameters:
48  sourceStart - pointer to a pointer to the source buffer.
49  The contents of this are modified on return so that
50  it points at the next thing to be converted.
51  targetStart - similarly, pointer to pointer to the target buffer.
52  sourceEnd, targetEnd - respectively pointers to the ends of the
53  two buffers, for overflow checking only.
54 
55  These conversion functions take a ConversionFlags argument. When this
56  flag is set to strict, both irregular sequences and isolated surrogates
57  will cause an error. When the flag is set to lenient, both irregular
58  sequences and isolated surrogates are converted.
59 
60  Whether the flag is strict or lenient, all illegal sequences will cause
61  an error return. This includes sequences such as: <F4 90 80 80>, <C0 80>,
62  or <A0> in UTF-8, and values above 0x10FFFF in UTF-32. Conformant code
63  must check for illegal sequences.
64 
65  When the flag is set to lenient, characters over 0x10FFFF are converted
66  to the replacement character; otherwise (when the flag is set to strict)
67  they constitute an error.
68 
69  Output parameters:
70  The value "sourceIllegal" is returned from some routines if the input
71  sequence is malformed. When "sourceIllegal" is returned, the source
72  value will point to the illegal value that caused the problem. E.g.,
73  in UTF-8 when a sequence is malformed, it points to the start of the
74  malformed sequence.
75 
76  Author: Mark E. Davis, 1994.
77  Rev History: Rick McGowan, fixes & updates May 2001.
78  Fixes & updates, Sept 2001.
79 
80 ------------------------------------------------------------------------ */
81 
82 /* ---------------------------------------------------------------------
83  The following 4 definitions are compiler-specific.
84  The C standard does not guarantee that wchar_t has at least
85  16 bits, so wchar_t is no less portable than unsigned short!
86  All should be unsigned values to avoid sign extension during
87  bit mask & shift operations.
88 ------------------------------------------------------------------------ */
89 
90 typedef unsigned int UTF32; /* at least 32 bits */
91 typedef unsigned short UTF16; /* at least 16 bits */
92 typedef unsigned char UTF8; /* typically 8 bits */
93 typedef unsigned char Boolean; /* 0 or 1 */
94 
95 /* Some fundamental constants */
96 #define UNI_REPLACEMENT_CHAR (UTF32)0x0000FFFD
97 #define UNI_MAX_BMP (UTF32)0x0000FFFF
98 #define UNI_MAX_UTF16 (UTF32)0x0010FFFF
99 #define UNI_MAX_UTF32 (UTF32)0x7FFFFFFF
100 #define UNI_MAX_LEGAL_UTF32 (UTF32)0x0010FFFF
101 
102 typedef enum {
103  conversionOK, /* conversion successful */
104  sourceExhausted, /* partial character in source, but hit end */
105  targetExhausted, /* insuff. room in target for conversion */
106  sourceIllegal /* source sequence is illegal/malformed */
108 
109 typedef enum {
113 
114 /* This is for C++ and does no harm in C */
115 #ifdef __cplusplus
116 extern "C" {
117 #endif
118 
120  const UTF8** sourceStart, const UTF8* sourceEnd,
121  UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags);
122 
124  const UTF16** sourceStart, const UTF16* sourceEnd,
125  UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags);
126 
128  const UTF8** sourceStart, const UTF8* sourceEnd,
129  UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
130 
132  const UTF32** sourceStart, const UTF32* sourceEnd,
133  UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags);
134 
136  const UTF16** sourceStart, const UTF16* sourceEnd,
137  UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
138 
140  const UTF32** sourceStart, const UTF32* sourceEnd,
141  UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags);
142 
143 Boolean isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd);
144 
145 #ifdef __cplusplus
146 }
147 #endif
148 
149 /* --------------------------------------------------------------------- */
ConversionResult ConvertUTF32toUTF8(const UTF32 **sourceStart, const UTF32 *sourceEnd, UTF8 **targetStart, UTF8 *targetEnd, ConversionFlags flags)
Definition: ConvertUTF.c:409
ConversionResult ConvertUTF16toUTF32(const UTF16 **sourceStart, const UTF16 *sourceEnd, UTF32 **targetStart, UTF32 *targetEnd, ConversionFlags flags)
Definition: ConvertUTF.c:110
Boolean isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd)
Definition: ConvertUTF.c:326
ConversionResult ConvertUTF16toUTF8(const UTF16 **sourceStart, const UTF16 *sourceEnd, UTF8 **targetStart, UTF8 *targetEnd, ConversionFlags flags)
Definition: ConvertUTF.c:214
ConversionResult
Definition: ConvertUTF.h:102
ConversionResult ConvertUTF32toUTF16(const UTF32 **sourceStart, const UTF32 *sourceEnd, UTF16 **targetStart, UTF16 *targetEnd, ConversionFlags flags)
Definition: ConvertUTF.c:61
unsigned char UTF8
Definition: ConvertUTF.h:92
unsigned short UTF16
Definition: ConvertUTF.h:91
const char * source
Definition: lz4hc.h:181
unsigned char Boolean
Definition: ConvertUTF.h:93
ConversionResult ConvertUTF8toUTF32(const UTF8 **sourceStart, const UTF8 *sourceEnd, UTF32 **targetStart, UTF32 *targetEnd, ConversionFlags flags)
Definition: ConvertUTF.c:462
unsigned int UTF32
Definition: ConvertUTF.h:90
ConversionFlags
Definition: ConvertUTF.h:109
ConversionResult ConvertUTF8toUTF16(const UTF8 **sourceStart, const UTF8 *sourceEnd, UTF16 **targetStart, UTF16 *targetEnd, ConversionFlags flags)
Definition: ConvertUTF.c:336


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Author(s): Mathieu Labbe
autogenerated on Mon Jan 23 2023 03:37:28