218 lines
7.5 KiB
C
218 lines
7.5 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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*
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* ucnv_bld.h:
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* Contains all internal and external data structure definitions
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* Created & Maitained by Bertrand A. Damiba
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*
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*
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*
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* ATTENTION:
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* ---------
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* Although the data structures in this file are open and stack allocatable
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* we reserve the right to hide them in further releases.
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*
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* Change history:
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*
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* 06/29/2000 helena Major rewrite of the callback APIs.
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*/
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#ifndef UCNV_BLD_H
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#define UCNV_BLD_H
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#include "unicode/utypes.h"
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#include "unicode/ucnv.h"
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#include "unicode/ucnv_err.h"
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/* ### move the following typedef and array into implementation files! */
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typedef struct
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{
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int32_t ccsid;
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UChar mismapped;
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UChar replacement;
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} UAmbiguousConverter;
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static const UAmbiguousConverter UCNV_AMBIGUOUSCONVERTERS[UCNV_MAX_AMBIGUOUSCCSIDS] =
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{
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{ 943, 0x00A5, 0x005C },
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{ 949, 0x20A9, 0x005C },
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{ 1361, 0x20A9, 0x005C },
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{ 942, 0x00A5, 0x005C },
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{ 1363, 0x20A9, 0x005C }
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};
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U_CDECL_BEGIN /* We must declare the following as 'extern "C"' so that if ucnv
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itself is compiled under C++, the linkage of the funcptrs will
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work.
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*/
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union UConverterTable;
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typedef union UConverterTable UConverterTable;
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struct UConverterImpl;
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typedef struct UConverterImpl UConverterImpl;
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/* ###
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* Markus Scherer on 2000feb04:
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* I have change UConverter and UConverterSharedData; there may be more changes,
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* or we may decide to roll back the structure definitions to what they were
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* before, with the additional UConverterImpl field and the new semantics for
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* referenceCounter.
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*
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* Reasons for changes: Attempt at performance improvements, especially
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* a) decrease amount of internal, implicit padding by reordering the fields
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* b) save space by storing the internal name of the converter only with a
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* pointer instead of an array
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*
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* In addition to that, I added the UConverterImpl field for better
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* modularizing the code and making it more maintainable. It may actually
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* become slightly faster by doing this.
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*
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* I changed the UConverter.to|fromUnicodeStatus to be unsigned because
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* the defaultValues.toUnicodeStatus is unsigned, and it seemed to be a safer choice.
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*
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* Ultimately, I would prefer not to expose these definitions any more at all,
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* but this is suspect to discussions, proposals and design reviews.
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*
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* I would personally like to see more information hiding (with helper APIs),
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* useful state fields in UConverter that are reserved for the callbacks,
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* and directly included structures instead of pointers to allocated
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* memory, like for UConverterTable and its variant fields.
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*
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* Also, with the more C++-like converter implementation,
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* the conversionType does not need to be in UConverterSharedData any more:
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* it is in UConverterImpl and hardly used.
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*/
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typedef struct {
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uint32_t structSize; /* Size of this structure */
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char name [UCNV_MAX_CONVERTER_NAME_LENGTH]; /* internal name of the converter- invariant chars */
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int32_t codepage; /* codepage # (now IBM-$codepage) */
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int8_t platform; /* platform of the converter (only IBM now) */
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int8_t conversionType; /* conversion type */
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int8_t minBytesPerChar; /* Minimum # bytes per char in this codepage */
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int8_t maxBytesPerChar; /* Maximum # bytes per char in this codepage */
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int8_t subCharLen;
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uint8_t subChar[UCNV_MAX_SUBCHAR_LEN];
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uint8_t hasToUnicodeFallback; /* UBool needs to be changed to UBool to be consistent across platform */
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uint8_t hasFromUnicodeFallback;
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uint8_t reserved[19]; /* to round out the structure */
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} UConverterStaticData;
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/*
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* Defines the UConverterSharedData struct,
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* the immutable, shared part of UConverter.
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*/
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typedef struct {
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uint32_t structSize; /* Size of this structure */
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uint32_t referenceCounter; /* used to count number of clients, 0xffffffff for static SharedData */
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const void *dataMemory; /* from udata_openChoice() */
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UConverterTable *table; /* Pointer to conversion data */
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const UConverterStaticData *staticData; /* pointer to the static (non changing) data. */
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UBool staticDataOwned; /* T if we own the staticData */
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const UConverterImpl *impl; /* vtable-style struct of mostly function pointers */
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/*initial values of some members of the mutable part of object */
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uint32_t toUnicodeStatus;
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} UConverterSharedData;
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/* Defines a UConverter, the lightweight mutable part the user sees */
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struct UConverter {
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uint32_t toUnicodeStatus; /* Used to internalize stream status information */
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uint32_t fromUnicodeStatus;
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UChar fromUSurrogateLead;
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int32_t mode;
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UBool useFallback;
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int8_t subCharLen; /* length of the codepage specific character sequence */
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int8_t invalidCharLength;
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int8_t invalidUCharLength;
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int8_t charErrorBufferLength; /* number of valid bytes in charErrorBuffer */
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int8_t UCharErrorBufferLength; /* number of valid UChars in charErrorBuffer */
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uint8_t subChar[UCNV_MAX_SUBCHAR_LEN]; /* codepage specific character sequence */
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char invalidCharBuffer[UCNV_MAX_SUBCHAR_LEN];
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uint8_t charErrorBuffer[UCNV_ERROR_BUFFER_LENGTH]; /* codepage output from Error functions */
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UChar invalidUCharBuffer[3];
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UChar UCharErrorBuffer[UCNV_ERROR_BUFFER_LENGTH]; /* unicode output from Error functions */
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/*
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* Error function pointer called when conversion issues
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* occur during a ucnv_fromUnicode call
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*/
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void (*fromUCharErrorBehaviour) (void *context,
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UConverterFromUnicodeArgs *args,
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const UChar *codeUnits,
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int32_t length,
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UChar32 codePoint,
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UConverterCallbackReason reason,
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UErrorCode *);
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/*
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* Error function pointer called when conversion issues
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* occur during a T_UConverter_toUnicode call
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*/
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void (*fromCharErrorBehaviour) (void *context,
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UConverterToUnicodeArgs *args,
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const char *codeUnits,
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int32_t length,
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UConverterCallbackReason reason,
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UErrorCode *);
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void *fromUContext;
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void *toUContext;
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UConverterSharedData *sharedData; /* Pointer to the shared immutable part of the converter object */
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/*
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* currently only used to point to a struct containing UConverter used by iso 2022;
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* could be used by clients writing their own call back function to pass context to them
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*/
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void *extraInfo;
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};
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U_CDECL_END /* end of UConverter */
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typedef struct
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{
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UConverter *currentConverter;
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uint8_t escSeq2022[10];
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int8_t escSeq2022Length;
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}
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UConverterDataISO2022;
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typedef struct
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{
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UConverter *OptGrpConverter[0x20]; /* Converter per Opt. grp. */
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uint8_t OptGroup; /* default Opt. grp. for this LMBCS session */
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uint8_t localeConverterIndex; /* reasonable locale match for index */
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}
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UConverterDataLMBCS;
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#define CONVERTER_FILE_EXTENSION ".cnv"
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#endif /* _UCNV_BLD */
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