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