235 lines
9.1 KiB
C
235 lines
9.1 KiB
C
/*
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**********************************************************************
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* Copyright (C) 1999-2002, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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*
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* uconv_cnv.h:
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* defines all the low level conversion functions
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* T_UnicodeConverter_{to,from}Unicode_$ConversionType
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*
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* Modification History:
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*
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* Date Name Description
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* 05/09/00 helena Added implementation to handle fallback mappings.
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* 06/29/2000 helena Major rewrite of the callback APIs.
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*/
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#ifndef UCNV_CNV_H
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#define UCNV_CNV_H
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#include "unicode/utypes.h"
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#include "unicode/ucnv_err.h"
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#include "ucnv_bld.h"
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#include "ucnvmbcs.h"
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union UConverterTable
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{
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UConverterMBCSTable mbcs;
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};
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U_CDECL_BEGIN
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/* this is used in fromUnicode DBCS tables as an "unassigned" marker */
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#define missingCharMarker 0xFFFF
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/*
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* #define missingUCharMarker 0xfffe
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*
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* there are actually two values used in toUnicode tables:
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* U+fffe "unassigned"
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* U+ffff "illegal"
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*/
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typedef void (*UConverterLoad) (UConverterSharedData *sharedData, const uint8_t *raw, UErrorCode *pErrorCode);
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typedef void (*UConverterUnload) (UConverterSharedData *sharedData);
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typedef void (*UConverterOpen) (UConverter *cnv, const char *name, const char *locale,uint32_t options, UErrorCode *pErrorCode);
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typedef void (*UConverterClose) (UConverter *cnv);
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typedef enum UConverterResetChoice {
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UCNV_RESET_BOTH,
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UCNV_RESET_TO_UNICODE,
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UCNV_RESET_FROM_UNICODE
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} UConverterResetChoice;
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typedef void (*UConverterReset) (UConverter *cnv, UConverterResetChoice choice);
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typedef void (*T_ToUnicodeFunction) (UConverterToUnicodeArgs *, UErrorCode *);
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typedef void (*T_FromUnicodeFunction) (UConverterFromUnicodeArgs *, UErrorCode *);
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typedef UChar32 (*T_GetNextUCharFunction) (UConverterToUnicodeArgs *, UErrorCode *);
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typedef void (*UConverterGetStarters)(const UConverter* converter,
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UBool starters[256],
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UErrorCode *pErrorCode);
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/* If this function pointer is null or if the function returns null
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* the name field in static data struct should be returned by
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* ucnv_getName() API function
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*/
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typedef const char * (*UConverterGetName) (const UConverter *cnv);
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/**
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* Write the codepage substitution character.
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* If this function is not set, then ucnv_cbFromUWriteSub() writes
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* the substitution character from UConverter.
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* For stateful converters, it is typically necessary to handle this
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* specificially for the converter in order to properly maintain the state.
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*/
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typedef void (*UConverterWriteSub) (UConverterFromUnicodeArgs *pArgs, int32_t offsetIndex, UErrorCode *pErrorCode);
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/**
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* For converter-specific safeClone processing
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* If this function is not set, then ucnv_safeClone assumes that the converter has no private data that changes
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* after the converter is done opening.
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* If this function is set, then it is called just after a memcpy() of
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* converter data to the new, empty converter, and is expected to set up
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* the initial state of the converter. It is not expected to increment the
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* reference counts of the standard data types such as the shared data.
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*/
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typedef UConverter * (*UConverterSafeClone) (const UConverter *cnv,
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void *stackBuffer,
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int32_t *pBufferSize,
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UErrorCode *status);
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UBool CONVERSION_U_SUCCESS (UErrorCode err);
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void ucnv_flushInternalUnicodeBuffer (UConverter * _this,
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UChar * myTarget,
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int32_t * myTargetIndex,
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int32_t targetLength,
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int32_t** offsets,
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UErrorCode * err);
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void ucnv_flushInternalCharBuffer (UConverter * _this,
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char *myTarget,
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int32_t * myTargetIndex,
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int32_t targetLength,
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int32_t** offsets,
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UErrorCode * err);
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/**
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* UConverterImpl contains all the data and functions for a converter type.
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* Its function pointers work much like a C++ vtable.
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* Many converter types need to define only a subset of the functions;
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* when a function pointer is NULL, then a default action will be performed.
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*
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* Every converter type must implement toUnicode, fromUnicode, and getNextUChar,
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* otherwise the converter may crash.
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* Every converter type that has variable-length codepage sequences should
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* also implement toUnicodeWithOffsets and fromUnicodeWithOffsets for
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* correct offset handling.
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* All other functions may or may not be implemented - it depends only on
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* whether the converter type needs them.
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*
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* When open() fails, then close() will be called, if present.
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*/
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struct UConverterImpl {
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UConverterType type;
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UConverterLoad load;
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UConverterUnload unload;
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UConverterOpen open;
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UConverterClose close;
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UConverterReset reset;
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T_ToUnicodeFunction toUnicode;
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T_ToUnicodeFunction toUnicodeWithOffsets;
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T_FromUnicodeFunction fromUnicode;
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T_FromUnicodeFunction fromUnicodeWithOffsets;
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T_GetNextUCharFunction getNextUChar;
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UConverterGetStarters getStarters;
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UConverterGetName getName;
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UConverterWriteSub writeSub;
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UConverterSafeClone safeClone;
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};
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extern const UConverterSharedData
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_MBCSData, _Latin1Data,
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_UTF8Data, _UTF16BEData, _UTF16LEData, _UTF32BEData, _UTF32LEData,
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_ISO2022Data,
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_LMBCSData1,_LMBCSData2, _LMBCSData3, _LMBCSData4, _LMBCSData5, _LMBCSData6,
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_LMBCSData8,_LMBCSData11,_LMBCSData16,_LMBCSData17,_LMBCSData18,_LMBCSData19,
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_HZData,_ISCIIData, _SCSUData, _ASCIIData,
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_UTF7Data, _Bocu1Data, _UTF16Data, _UTF32Data, _CESU8Data, _IMAPData;
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U_CDECL_END
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/**
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* This function is useful for implementations of getNextUChar().
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* After a call to a callback function or to toUnicode(), an output buffer
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* begins with a Unicode code point that needs to be returned as UChar32,
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* and all following code units must be prepended to the - potentially
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* prefilled - overflow buffer in the UConverter.
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* The buffer should be at least of capacity UTF_MAX_CHAR_LENGTH so that a
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* complete UChar32's UChars fit into it.
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*
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* @param cnv The converter that will get remaining UChars copied to its overflow area.
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* @param buffer An array of UChars that was passed into a callback function
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* or a toUnicode() function.
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* @param length The number of code units (UChars) that are actually in the buffer.
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* This must be >0.
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* @return The code point from the first UChars in the buffer.
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*/
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U_CFUNC UChar32
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ucnv_getUChar32KeepOverflow(UConverter *cnv, const UChar *buffer, int32_t length);
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/**
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* This helper function updates the offsets array after a callback function call.
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* It adds the sourceIndex to each offsets item, or sets each of them to -1 if
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* sourceIndex==-1.
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*
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* @param offsets The pointer to offsets entry that corresponds to the first target
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* unit that the callback wrote.
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* @param length The number of output units that the callback wrote.
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* @param sourceIndex The sourceIndex of the input sequence that the callback
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* function was called for.
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* @return offsets+length if offsets!=NULL, otherwise NULL
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*/
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U_CFUNC int32_t *
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ucnv_updateCallbackOffsets(int32_t *offsets, int32_t length, int32_t sourceIndex);
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/** Always use fallbacks from codepage to Unicode */
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#define TO_U_USE_FALLBACK(useFallback) TRUE
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#define UCNV_TO_U_USE_FALLBACK(cnv) TRUE
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/** Use fallbacks from Unicode to codepage when cnv->useFallback or for private-use code points */
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#define IS_PRIVATE_USE(c) ((uint32_t)((c)-0xe000)<0x1900 || (uint32_t)((c)-0xf0000)<0x20000)
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#define FROM_U_USE_FALLBACK(useFallback, c) ((useFallback) || IS_PRIVATE_USE(c))
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#define UCNV_FROM_U_USE_FALLBACK(cnv, c) FROM_U_USE_FALLBACK((cnv)->useFallback, c)
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/**
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* This is a simple implementation of ucnv_getNextUChar() that uses the
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* converter's toUnicode() function.
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*
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* \par
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* A surrogate pair from a single byte sequence is always
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* combined to a supplementary code point.
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* A surrogate pair from consecutive byte sequences is only combined
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* if collectPairs is set. This is necessary for SCSU
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* but not allowed for most legacy codepages.
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*
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* @param pArgs The argument structure supplied by ucnv_getNextUChar()
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* @param toU A function pointer to the converter's toUnicode() function
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* @param collectPairs indicates whether separate surrogate results from
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* consecutive byte sequences should be combined into
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* a single code point
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* @param pErrorCode An ICU error code parameter
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* @return The Unicode code point as a result of a conversion of a minimal
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* number of input bytes
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*/
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U_CFUNC UChar32
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ucnv_getNextUCharFromToUImpl(UConverterToUnicodeArgs *pArgs,
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T_ToUnicodeFunction toU,
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UBool collectPairs,
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UErrorCode *pErrorCode);
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#endif /* UCNV_CNV */
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