190 lines
6.1 KiB
C
190 lines
6.1 KiB
C
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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*******************************************************************************
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*
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* Copyright (C) 2008-2011, International Business Machines
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* Corporation, Google and others. All Rights Reserved.
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*
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*******************************************************************************
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*/
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/*
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* Author : eldawy@google.com (Mohamed Eldawy)
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* ucnvsel.h
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*
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* Purpose: To generate a list of encodings capable of handling
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* a given Unicode text
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*
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* Started 09-April-2008
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*/
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#ifndef __ICU_UCNV_SEL_H__
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#define __ICU_UCNV_SEL_H__
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_CONVERSION
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#include "unicode/uset.h"
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#include "unicode/utf16.h"
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#include "unicode/uenum.h"
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#include "unicode/ucnv.h"
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#include "unicode/localpointer.h"
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/**
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* \file
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*
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* A converter selector is built with a set of encoding/charset names
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* and given an input string returns the set of names of the
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* corresponding converters which can convert the string.
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*
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* A converter selector can be serialized into a buffer and reopened
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* from the serialized form.
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*/
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/**
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* @{
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* The selector data structure
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*/
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struct UConverterSelector;
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typedef struct UConverterSelector UConverterSelector;
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/** @} */
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/**
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* Open a selector.
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* If converterListSize is 0, build for all available converters.
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* If excludedCodePoints is NULL, don't exclude any code points.
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*
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* @param converterList a pointer to encoding names needed to be involved.
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* Can be NULL if converterListSize==0.
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* The list and the names will be cloned, and the caller
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* retains ownership of the original.
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* @param converterListSize number of encodings in above list.
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* If 0, builds a selector for all available converters.
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* @param excludedCodePoints a set of code points to be excluded from consideration.
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* That is, excluded code points in a string do not change
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* the selection result. (They might be handled by a callback.)
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* Use NULL to exclude nothing.
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* @param whichSet what converter set to use? Use this to determine whether
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* to consider only roundtrip mappings or also fallbacks.
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* @param status an in/out ICU UErrorCode
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* @return the new selector
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*
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* @stable ICU 4.2
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*/
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U_STABLE UConverterSelector* U_EXPORT2
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ucnvsel_open(const char* const* converterList, int32_t converterListSize,
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const USet* excludedCodePoints,
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const UConverterUnicodeSet whichSet, UErrorCode* status);
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/**
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* Closes a selector.
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* If any Enumerations were returned by ucnv_select*, they become invalid.
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* They can be closed before or after calling ucnv_closeSelector,
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* but should never be used after the selector is closed.
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*
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* @see ucnv_selectForString
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* @see ucnv_selectForUTF8
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*
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* @param sel selector to close
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*
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* @stable ICU 4.2
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*/
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U_STABLE void U_EXPORT2
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ucnvsel_close(UConverterSelector *sel);
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#if U_SHOW_CPLUSPLUS_API
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U_NAMESPACE_BEGIN
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/**
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* \class LocalUConverterSelectorPointer
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* "Smart pointer" class, closes a UConverterSelector via ucnvsel_close().
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* For most methods see the LocalPointerBase base class.
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*
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* @see LocalPointerBase
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* @see LocalPointer
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* @stable ICU 4.4
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*/
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U_DEFINE_LOCAL_OPEN_POINTER(LocalUConverterSelectorPointer, UConverterSelector, ucnvsel_close);
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U_NAMESPACE_END
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#endif
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/**
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* Open a selector from its serialized form.
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* The buffer must remain valid and unchanged for the lifetime of the selector.
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* This is much faster than creating a selector from scratch.
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* Using a serialized form from a different machine (endianness/charset) is supported.
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*
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* @param buffer pointer to the serialized form of a converter selector;
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* must be 32-bit-aligned
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* @param length the capacity of this buffer (can be equal to or larger than
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* the actual data length)
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* @param status an in/out ICU UErrorCode
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* @return the new selector
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*
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* @stable ICU 4.2
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*/
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U_STABLE UConverterSelector* U_EXPORT2
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ucnvsel_openFromSerialized(const void* buffer, int32_t length, UErrorCode* status);
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/**
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* Serialize a selector into a linear buffer.
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* The serialized form is portable to different machines.
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*
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* @param sel selector to consider
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* @param buffer pointer to 32-bit-aligned memory to be filled with the
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* serialized form of this converter selector
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* @param bufferCapacity the capacity of this buffer
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* @param status an in/out ICU UErrorCode
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* @return the required buffer capacity to hold serialize data (even if the call fails
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* with a U_BUFFER_OVERFLOW_ERROR, it will return the required capacity)
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*
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* @stable ICU 4.2
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*/
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U_STABLE int32_t U_EXPORT2
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ucnvsel_serialize(const UConverterSelector* sel,
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void* buffer, int32_t bufferCapacity, UErrorCode* status);
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/**
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* Select converters that can map all characters in a UTF-16 string,
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* ignoring the excluded code points.
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*
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* @param sel a selector
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* @param s UTF-16 string
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* @param length length of the string, or -1 if NUL-terminated
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* @param status an in/out ICU UErrorCode
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* @return an enumeration containing encoding names.
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* The returned encoding names and their order will be the same as
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* supplied when building the selector.
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*
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* @stable ICU 4.2
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*/
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U_STABLE UEnumeration * U_EXPORT2
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ucnvsel_selectForString(const UConverterSelector* sel,
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const UChar *s, int32_t length, UErrorCode *status);
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/**
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* Select converters that can map all characters in a UTF-8 string,
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* ignoring the excluded code points.
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*
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* @param sel a selector
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* @param s UTF-8 string
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* @param length length of the string, or -1 if NUL-terminated
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* @param status an in/out ICU UErrorCode
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* @return an enumeration containing encoding names.
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* The returned encoding names and their order will be the same as
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* supplied when building the selector.
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*
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* @stable ICU 4.2
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*/
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U_STABLE UEnumeration * U_EXPORT2
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ucnvsel_selectForUTF8(const UConverterSelector* sel,
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const char *s, int32_t length, UErrorCode *status);
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#endif /* !UCONFIG_NO_CONVERSION */
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#endif /* __ICU_UCNV_SEL_H__ */
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