258 lines
10 KiB
C
258 lines
10 KiB
C
/*
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**********************************************************************
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* Copyright (C) 1999, 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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#include "ucmp8.h"
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#include "ucmp16.h"
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/*Table Node Definitions */
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typedef struct
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{
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UChar *toUnicode; /* [256]; */
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CompactByteArray fromUnicode;
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UChar *toUnicodeFallback;
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CompactByteArray fromUnicodeFallback;
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}
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UConverterSBCSTable;
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typedef struct
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{
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CompactShortArray toUnicode;
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CompactShortArray fromUnicode;
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CompactShortArray toUnicodeFallback;
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CompactShortArray fromUnicodeFallback;
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}
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UConverterDBCSTable;
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union UConverterTable
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{
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UConverterSBCSTable sbcs;
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UConverterDBCSTable dbcs;
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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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#define FromU_CALLBACK_MACRO(context, args, codeUnits, length, codePoint, reason, err) \
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{ \
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/*copies current values for the ErrorFunctor to update */ \
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/*Calls the ErrorFunctor */ \
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args->converter->fromUCharErrorBehaviour ( context, \
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args, \
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codeUnits, \
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length, \
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codePoint, \
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reason, \
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err); \
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myTargetIndex = args->target - (char*)myTarget; \
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mySourceIndex = args->source - mySource; \
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}
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/*
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*/
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#define ToU_CALLBACK_MACRO(context, args, codePoints, length, reason, err) \
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{ \
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/*Calls the ErrorFunctor */ \
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args->converter->fromCharErrorBehaviour ( \
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context, \
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args, \
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codePoints, \
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length, \
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reason, \
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err); \
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myTargetIndex = args->target - myTarget; \
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mySourceIndex = args->source - (const char*)mySource; \
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}
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/*
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*/
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#define FromU_CALLBACK_OFFSETS_LOGIC_MACRO(context, args, codeUnits, length, codePoint, reason, err) \
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{ \
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int32_t My_i = myTargetIndex; \
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/*copies current values for the ErrorFunctor to update */ \
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/*Calls the ErrorFunctor */ \
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args->converter->fromUCharErrorBehaviour ( \
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context, \
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args, \
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codeUnits, \
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length, \
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codePoint, \
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reason, \
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err); \
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/*Update the local Indexes so that the conversion can restart at the right points */ \
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myTargetIndex = args->target - (char*)myTarget; \
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mySourceIndex = args->source - mySource; \
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args->offsets = saveOffsets; \
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for (;My_i < myTargetIndex;My_i++) args->offsets[My_i] += currentOffset; \
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}
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/*
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*/
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#define ToU_CALLBACK_OFFSETS_LOGIC_MACRO(context, args, codePoints, length, reason, err) \
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{ \
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args->converter->fromCharErrorBehaviour ( \
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context, \
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args, \
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codePoints, \
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length, \
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reason, \
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err); \
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/*Update the local Indexes so that the conversion can restart at the right points */ \
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myTargetIndex = args->target - myTarget; \
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mySourceIndex = args->source - (const char*)mySource; \
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args->offsets = saveOffsets; \
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for (;My_i < myTargetIndex;My_i++) {args->offsets[My_i] += currentOffset;} \
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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* version, UErrorCode *pErrorCode);
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typedef void (*UConverterClose) (UConverter *cnv);
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typedef void (*UConverterReset) (UConverter *cnv);
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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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UBool CONVERSION_U_SUCCESS (UErrorCode err);
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void 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 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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};
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extern const UConverterSharedData
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_SBCSData, _DBCSData, _MBCSData, _Latin1Data,
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_UTF8Data, _UTF16BEData, _UTF16LEData, _UTF32BEData, _UTF32LEData,
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_EBCDICStatefulData, _ISO2022Data,
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_LMBCSData1,_LMBCSData2, _LMBCSData3, _LMBCSData4, _LMBCSData5, _LMBCSData6,
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_LMBCSData8,_LMBCSData11,_LMBCSData16,_LMBCSData17,_LMBCSData18,_LMBCSData19,_HZData;
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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 FROM_U_USE_FALLBACK(useFallback, c) ((useFallback) || (uint32_t)((c)-0xe000)<0x1900 || (uint32_t)((c)-0xf0000)<0x20000)
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#define UCNV_FROM_U_USE_FALLBACK(cnv, c) FROM_U_USE_FALLBACK((cnv)->useFallback, c)
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#endif /* UCNV_CNV */
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