source: subversion/applications/rendering/gosmore/ConvertUTF.h @ 24484

Last change on this file since 24484 was 9177, checked in by nic, 11 years ago

WinCE : Convert between UTF8 and UTF16 using builtin functions.
WinCE : Fix & bug

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File size: 5.8 KB
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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
8 * kind are expressed or implied. The recipient agrees to determine
9 * applicability of information provided. If this file has been
10 * purchased on magnetic or optical media from Unicode, Inc., the
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
90typedef unsigned long   UTF32;  /* at least 32 bits */
91typedef unsigned short  UTF16;  /* at least 16 bits */
92typedef unsigned char   UTF8;   /* typically 8 bits */
93typedef 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
102typedef 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 */
107} ConversionResult;
108
109typedef enum {
110        strictConversion = 0,
111        lenientConversion
112} ConversionFlags;
113
114/* This is for C++ and does no harm in C */
115#ifdef __cplusplus
116extern "C" {
117#endif
118
119ConversionResult ConvertUTF8toUTF16 (
120                const UTF8** sourceStart, const UTF8* sourceEnd, 
121                UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags);
122
123ConversionResult ConvertUTF16toUTF8 (
124                const UTF16** sourceStart, const UTF16* sourceEnd, 
125                UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags);
126               
127ConversionResult ConvertUTF8toUTF32 (
128                const UTF8** sourceStart, const UTF8* sourceEnd, 
129                UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
130
131ConversionResult ConvertUTF32toUTF8 (
132                const UTF32** sourceStart, const UTF32* sourceEnd, 
133                UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags);
134               
135ConversionResult ConvertUTF16toUTF32 (
136                const UTF16** sourceStart, const UTF16* sourceEnd, 
137                UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
138
139ConversionResult ConvertUTF32toUTF16 (
140                const UTF32** sourceStart, const UTF32* sourceEnd, 
141                UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags);
142
143Boolean isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd);
144
145#ifdef __cplusplus
146}
147#endif
148
149/* --------------------------------------------------------------------- */
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