1/*
2**********************************************************************
3*   Copyright (C) 1999-2009, International Business Machines
4*   Corporation and others.  All Rights Reserved.
5**********************************************************************
6*
7*
8*  ucnv_imp.h:
9*  Contains all internal and external data structure definitions
10* Created & Maitained by Bertrand A. Damiba
11*
12*
13*
14* ATTENTION:
15* ---------
16* Although the data structures in this file are open and stack allocatable
17* we reserve the right to hide them in further releases.
18*/
19
20#ifndef UCNV_IMP_H
21#define UCNV_IMP_H
22
23#include "unicode/utypes.h"
24
25#if !UCONFIG_NO_CONVERSION
26
27#include "unicode/uloc.h"
28#include "ucnv_bld.h"
29
30/*
31 * Fast check for whether a charset name is "UTF-8".
32 * This does not recognize all of the variations that ucnv_open()
33 * and other functions recognize, but it covers most cases.
34 * @param name const char * charset name
35 * @return
36 */
37#define UCNV_FAST_IS_UTF8(name) \
38    (((name[0]=='U' ? \
39      (                name[1]=='T' && name[2]=='F') : \
40      (name[0]=='u' && name[1]=='t' && name[2]=='f'))) \
41  && (name[3]=='-' ? \
42     (name[4]=='8' && name[5]==0) : \
43     (name[3]=='8' && name[4]==0)))
44
45typedef struct {
46    char cnvName[UCNV_MAX_CONVERTER_NAME_LENGTH];
47    char locale[ULOC_FULLNAME_CAPACITY];
48    uint32_t options;
49} UConverterNamePieces;
50
51U_CFUNC UBool
52ucnv_canCreateConverter(const char *converterName, UErrorCode *err);
53
54/* figures out if we need to go to file to read in the data tables.
55 * @param converterName The name of the converter
56 * @param err The error code
57 * @return the newly created converter
58 */
59UConverter *ucnv_createConverter (UConverter *myUConverter, const char *converterName, UErrorCode * err);
60
61/*
62 * Open a purely algorithmic converter, specified by a type constant.
63 * @param myUConverter  NULL, or pre-allocated UConverter structure to avoid
64 *                      a memory allocation
65 * @param type          requested converter type
66 * @param locale        locale parameter, or ""
67 * @param options       converter options bit set (default 0)
68 * @param err           ICU error code, not tested for U_FAILURE on input
69 *                      because this is an internal function
70 * @internal
71 */
72U_CFUNC UConverter *
73ucnv_createAlgorithmicConverter(UConverter *myUConverter,
74                                UConverterType type,
75                                const char *locale, uint32_t options,
76                                UErrorCode *err);
77
78/*
79 * Creates a converter from shared data.
80 * Adopts mySharedConverterData: No matter what happens, the caller must not
81 * unload mySharedConverterData, except via ucnv_close(return value)
82 * if this function is successful.
83 */
84UConverter*
85ucnv_createConverterFromSharedData(UConverter *myUConverter,
86                                   UConverterSharedData *mySharedConverterData,
87                                   UConverterLoadArgs *pArgs,
88                                   UErrorCode *err);
89
90UConverter* ucnv_createConverterFromPackage(const char *packageName, const char *converterName,
91                                            UErrorCode *err);
92
93/**
94 * Load a converter but do not create a UConverter object.
95 * Simply return the UConverterSharedData.
96 * Performs alias lookup etc.
97 * The UConverterNamePieces need not be initialized
98 * before calling this function.
99 * The UConverterLoadArgs must be initialized
100 * before calling this function.
101 * If the args are passed in, then the pieces must be passed in too.
102 * In other words, the following combinations are allowed:
103 * - pieces==NULL && args==NULL
104 * - pieces!=NULL && args==NULL
105 * - pieces!=NULL && args!=NULL
106 * @internal
107 */
108UConverterSharedData *
109ucnv_loadSharedData(const char *converterName,
110                    UConverterNamePieces *pieces,
111                    UConverterLoadArgs *pArgs,
112                    UErrorCode * err);
113
114/**
115 * This may unload the shared data in a thread safe manner.
116 * This will only unload the data if no other converters are sharing it.
117 */
118void
119ucnv_unloadSharedDataIfReady(UConverterSharedData *sharedData);
120
121/**
122 * This is a thread safe way to increment the reference count.
123 */
124void
125ucnv_incrementRefCount(UConverterSharedData *sharedData);
126
127/**
128 * These are the default error handling callbacks for the charset conversion framework.
129 * For performance reasons, they are only called to handle an error (not normally called for a reset or close).
130 */
131#define UCNV_TO_U_DEFAULT_CALLBACK ((UConverterToUCallback) UCNV_TO_U_CALLBACK_SUBSTITUTE)
132#define UCNV_FROM_U_DEFAULT_CALLBACK ((UConverterFromUCallback) UCNV_FROM_U_CALLBACK_SUBSTITUTE)
133
134#endif
135
136#endif /* _UCNV_IMP */
137