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Diffstat (limited to 'intl/icu/source/common/ucnvmbcs.h')
| -rw-r--r-- | intl/icu/source/common/ucnvmbcs.h | 605 |
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diff --git a/intl/icu/source/common/ucnvmbcs.h b/intl/icu/source/common/ucnvmbcs.h new file mode 100644 index 000000000..5bbbae7a8 --- /dev/null +++ b/intl/icu/source/common/ucnvmbcs.h @@ -0,0 +1,605 @@ +// Copyright (C) 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +****************************************************************************** +* +* Copyright (C) 2000-2013, International Business Machines +* Corporation and others. All Rights Reserved. +* +****************************************************************************** +* file name: ucnvmbcs.h +* encoding: US-ASCII +* tab size: 8 (not used) +* indentation:4 +* +* created on: 2000jul07 +* created by: Markus W. Scherer +*/ + +#ifndef __UCNVMBCS_H__ +#define __UCNVMBCS_H__ + +#include "unicode/utypes.h" + +#if !UCONFIG_NO_CONVERSION + +#include "unicode/ucnv.h" +#include "ucnv_cnv.h" +#include "ucnv_ext.h" + +/** + * ICU conversion (.cnv) data file structure, following the usual UDataInfo + * header. + * + * Format version: 6.2 + * + * struct UConverterStaticData -- struct containing the converter name, IBM CCSID, + * min/max bytes per character, etc. + * see ucnv_bld.h + * + * -------------------- + * + * The static data is followed by conversionType-specific data structures. + * At the moment, there are only variations of MBCS converters. They all have + * the same toUnicode structures, while the fromUnicode structures for SBCS + * differ from those for other MBCS-style converters. + * + * _MBCSHeader.version 5 is optional and not backward-compatible + * (as usual for changes in the major version field). + * + * Versions 5.m work like versions 4.m except: + * - The _MBCSHeader has variable length (and is always longer than in version 4). + * See the struct _MBCSHeader further description below. + * - There is a set of flags which indicate further incompatible changes. + * (Reader code must reject the file if it does not recognize them all.) + * - In particular, one of these flags indicates that most of the fromUnicode + * data is missing and must be reconstituted from the toUnicode data + * and from the utf8Friendly mbcsIndex at load time. + * (This only works with a utf8Friendly table.) + * In this case, makeconv may increase maxFastUChar automatically to U+FFFF. + * + * The first of these versions is 5.3, which is like 4.3 except for the differences above. + * + * When possible, makeconv continues to generate version 4.m files. + * + * _MBCSHeader.version 5.4/4.4 supports "good one-way" mappings (|4) + * in the extension tables (fromUTableValues bit 30). See ucnv_ext.h for details. + * + * _MBCSHeader.version 4.3 optionally modifies the fromUnicode data structures + * slightly and optionally adds a table for conversion to MBCS (non-SBCS) + * charsets. + * + * The modifications are to make the data utf8Friendly. Not every 4.3 file + * file contains utf8Friendly data. + * It is utf8Friendly if _MBCSHeader.version[2]!=0. + * In this case, the data structures are utf8Friendly up to the code point + * maxFastUChar=((_MBCSHeader.version[2]<<8)|0xff) + * + * A utf8Friendly file has fromUnicode stage 3 entries for code points up to + * maxFastUChar allocated in blocks of 64 for indexing with the 6 bits from + * a UTF-8 trail byte. ASCII is allocated linearly with 128 contiguous entries. + * + * In addition, a utf8Friendly MBCS file contains an additional + * uint16_t mbcsIndex[(maxFastUChar+1)>>6]; + * which replaces the stage 1 and 2 tables for indexing with bits from the + * UTF-8 lead byte and middle trail byte. Unlike the older MBCS stage 2 table, + * the mbcsIndex does not contain roundtrip flags. Therefore, all fallbacks + * from code points up to maxFastUChar (and roundtrips to 0x00) are moved to + * the extension data structure. This also allows for faster roundtrip + * conversion from UTF-16. + * + * SBCS files do not contain an additional sbcsIndex[] array because the + * proportional size increase would be noticeable, but the runtime + * code builds one for the code point range for which the runtime conversion + * code is optimized. + * + * For SBCS, maxFastUChar should be at least U+0FFF. The initial makeconv + * implementation sets it to U+1FFF. Because the sbcsIndex is not stored in + * the file, a larger maxFastUChar only affects stage 3 block allocation size + * and is free in empty blocks. (Larger blocks with sparse contents cause larger + * files.) U+1FFF includes almost all of the small scripts. + * U+0FFF covers UTF-8 two-byte sequences and three-byte sequences starting with + * 0xe0. This includes most scripts with legacy SBCS charsets. + * The initial runtime implementation using 4.3 files only builds an sbcsIndex + * for code points up to U+0FFF. + * + * For MBCS, maxFastUChar should be at least U+D7FF (=initial value). + * This boundary is convenient because practically all of the commonly used + * characters are below it, and because it is the boundary to surrogate + * code points, above which special handling is necessary anyway. + * (Surrogate pair assembly for UTF-16, validity checking for UTF-8.) + * + * maxFastUChar could be up to U+FFFF to cover the whole BMP, which could be + * useful especially for conversion from UTF-8 when the input can be assumed + * to be valid, because the surrogate range would then not have to be + * checked. + * (With maxFastUChar=0xffff, makeconv would have to check for mbcsIndex value + * overflow because with the all-unassigned block 0 and nearly full mappings + * from the BMP it is theoretically possible that an index into stage 3 + * exceeds 16 bits.) + * + * _MBCSHeader.version 4.2 adds an optional conversion extension data structure. + * If it is present, then an ICU version reading header versions 4.0 or 4.1 + * will be able to use the base table and ignore the extension. + * + * The unicodeMask in the static data is part of the base table data structure. + * Especially, the UCNV_HAS_SUPPLEMENTARY flag determines the length of the + * fromUnicode stage 1 array. + * The static data unicodeMask refers only to the base table's properties if + * a base table is included. + * In an extension-only file, the static data unicodeMask is 0. + * The extension data indexes have a separate field with the unicodeMask flags. + * + * MBCS-style data structure following the static data. + * Offsets are counted in bytes from the beginning of the MBCS header structure. + * Details about usage in comments in ucnvmbcs.c. + * + * struct _MBCSHeader (see the definition in this header file below) + * contains 32-bit fields as follows: + * 8 values: + * 0 uint8_t[4] MBCS version in UVersionInfo format (currently 4.3.x.0) + * 1 uint32_t countStates + * 2 uint32_t countToUFallbacks + * 3 uint32_t offsetToUCodeUnits + * 4 uint32_t offsetFromUTable + * 5 uint32_t offsetFromUBytes + * 6 uint32_t flags, bits: + * 31.. 8 offsetExtension -- _MBCSHeader.version 4.2 (ICU 2.8) and higher + * 0 for older versions and if + * there is not extension structure + * 7.. 0 outputType + * 7 uint32_t fromUBytesLength -- _MBCSHeader.version 4.1 (ICU 2.4) and higher + * counts bytes in fromUBytes[] + * + * New and required in version 5: + * 8 uint32_t options, bits: + * 31..16 reserved for flags that can be added without breaking + * backward compatibility + * 15.. 6 reserved for flags whose addition will break + * backward compatibility + * 6 MBCS_OPT_FROM_U -- if set, + * then most of the fromUnicode data is omitted; + * fullStage2Length is present and the missing + * bottom part of stage 2 must be reconstituted from + * the toUnicode data; + * stage 3 is missing completely as well; + * not used for SBCS tables + * 5.. 0 length of the _MBCSHeader (number of uint32_t) + * + * New and optional in version 5: + * 9 uint32_t fullStage2Length: used if MBCS_OPT_FROM_U is set + * specifies the full length of stage 2 + * including the omitted part + * + * if(outputType==MBCS_OUTPUT_EXT_ONLY) { + * -- base table name for extension-only table + * char baseTableName[variable]; -- with NUL plus padding for 4-alignment + * + * -- all _MBCSHeader fields except for version and flags are 0 + * } else { + * -- normal base table with optional extension + * + * int32_t stateTable[countStates][256]; + * + * struct _MBCSToUFallback { (fallbacks are sorted by offset) + * uint32_t offset; + * UChar32 codePoint; + * } toUFallbacks[countToUFallbacks]; + * + * uint16_t unicodeCodeUnits[(offsetFromUTable-offsetToUCodeUnits)/2]; + * (padded to an even number of units) + * + * -- stage 1 tables + * if(staticData.unicodeMask&UCNV_HAS_SUPPLEMENTARY) { + * -- stage 1 table for all of Unicode + * uint16_t fromUTable[0x440]; (32-bit-aligned) + * } else { + * -- BMP-only tables have a smaller stage 1 table + * uint16_t fromUTable[0x40]; (32-bit-aligned) + * } + * + * -- stage 2 tables + * length determined by top of stage 1 and bottom of stage 3 tables + * if(outputType==MBCS_OUTPUT_1) { + * -- SBCS: pure indexes + * uint16_t stage 2 indexes[?]; + * } else { + * -- DBCS, MBCS, EBCDIC_STATEFUL, ...: roundtrip flags and indexes + * uint32_t stage 2 flags and indexes[?]; + * if(options&MBCS_OPT_NO_FROM_U) { + * stage 2 really has length fullStage2Length + * and the omitted lower part must be reconstituted from + * the toUnicode data + * } + * } + * + * -- stage 3 tables with byte results + * if(outputType==MBCS_OUTPUT_1) { + * -- SBCS: each 16-bit result contains flags and the result byte, see ucnvmbcs.c + * uint16_t fromUBytes[fromUBytesLength/2]; + * } else if(!(options&MBCS_OPT_NO_FROM_U)) { + * -- DBCS, MBCS, EBCDIC_STATEFUL, ... 2/3/4 bytes result, see ucnvmbcs.c + * uint8_t fromUBytes[fromUBytesLength]; or + * uint16_t fromUBytes[fromUBytesLength/2]; or + * uint32_t fromUBytes[fromUBytesLength/4]; + * } else { + * fromUBytes[] must be reconstituted from the toUnicode data + * } + * + * -- optional utf8Friendly mbcsIndex -- _MBCSHeader.version 4.3 (ICU 3.8) and higher + * if(outputType!=MBCS_OUTPUT_1 && + * _MBCSHeader.version[1]>=3 && + * (maxFastUChar=_MBCSHeader.version[2])!=0 + * ) { + * maxFastUChar=(maxFastUChar<<8)|0xff; + * uint16_t mbcsIndex[(maxFastUChar+1)>>6]; + * } + * } + * + * -- extension table, details see ucnv_ext.h + * int32_t indexes[>=32]; ... + */ + +/* MBCS converter data and state -------------------------------------------- */ + +enum { + MBCS_MAX_STATE_COUNT=128 +}; + +/** + * MBCS action codes for conversions to Unicode. + * These values are in bits 23..20 of the state table entries. + */ +enum { + MBCS_STATE_VALID_DIRECT_16, + MBCS_STATE_VALID_DIRECT_20, + + MBCS_STATE_FALLBACK_DIRECT_16, + MBCS_STATE_FALLBACK_DIRECT_20, + + MBCS_STATE_VALID_16, + MBCS_STATE_VALID_16_PAIR, + + MBCS_STATE_UNASSIGNED, + MBCS_STATE_ILLEGAL, + + MBCS_STATE_CHANGE_ONLY +}; + +/* Macros for state table entries */ +#define MBCS_ENTRY_TRANSITION(state, offset) (int32_t)(((int32_t)(state)<<24L)|(offset)) +#define MBCS_ENTRY_TRANSITION_SET_OFFSET(entry, offset) (int32_t)(((entry)&0xff000000)|(offset)) +#define MBCS_ENTRY_TRANSITION_ADD_OFFSET(entry, offset) (int32_t)((entry)+(offset)) + +#define MBCS_ENTRY_FINAL(state, action, value) (int32_t)(0x80000000|((int32_t)(state)<<24L)|((action)<<20L)|(value)) +#define MBCS_ENTRY_SET_FINAL(entry) (int32_t)((entry)|0x80000000) +#define MBCS_ENTRY_FINAL_SET_ACTION(entry, action) (int32_t)(((entry)&0xff0fffff)|((int32_t)(action)<<20L)) +#define MBCS_ENTRY_FINAL_SET_VALUE(entry, value) (int32_t)(((entry)&0xfff00000)|(value)) +#define MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, action, value) (int32_t)(((entry)&0xff000000)|((int32_t)(action)<<20L)|(value)) + +#define MBCS_ENTRY_SET_STATE(entry, state) (int32_t)(((entry)&0x80ffffff)|((int32_t)(state)<<24L)) + +#define MBCS_ENTRY_STATE(entry) ((((uint32_t)entry)>>24)&0x7f) + +#define MBCS_ENTRY_IS_TRANSITION(entry) ((entry)>=0) +#define MBCS_ENTRY_IS_FINAL(entry) ((entry)<0) + +#define MBCS_ENTRY_TRANSITION_STATE(entry) (((uint32_t)entry)>>24) +#define MBCS_ENTRY_TRANSITION_OFFSET(entry) ((entry)&0xffffff) + +#define MBCS_ENTRY_FINAL_STATE(entry) ((((uint32_t)entry)>>24)&0x7f) +#define MBCS_ENTRY_FINAL_IS_VALID_DIRECT_16(entry) ((entry)<(int32_t)0x80100000) +#define MBCS_ENTRY_FINAL_ACTION(entry) ((((uint32_t)entry)>>20)&0xf) +#define MBCS_ENTRY_FINAL_VALUE(entry) ((entry)&0xfffff) +#define MBCS_ENTRY_FINAL_VALUE_16(entry) (uint16_t)(entry) + +#define IS_ASCII_ROUNDTRIP(b, asciiRoundtrips) (((asciiRoundtrips) & (1<<((b)>>2)))!=0) + +/* single-byte fromUnicode: get the 16-bit result word */ +#define MBCS_SINGLE_RESULT_FROM_U(table, results, c) (results)[ (table)[ (table)[(c)>>10] +(((c)>>4)&0x3f) ] +((c)&0xf) ] + +/* single-byte fromUnicode using the sbcsIndex */ +#define SBCS_RESULT_FROM_LOW_BMP(table, results, c) (results)[ (table)[(c)>>6] +((c)&0x3f) ] + +/* single-byte fromUTF8 using the sbcsIndex; l and t must be masked externally; can be l=0 and t<=0x7f */ +#define SBCS_RESULT_FROM_UTF8(table, results, l, t) (results)[ (table)[l] +(t) ] + +/* multi-byte fromUnicode: get the 32-bit stage 2 entry */ +#define MBCS_STAGE_2_FROM_U(table, c) ((const uint32_t *)(table))[ (table)[(c)>>10] +(((c)>>4)&0x3f) ] +#define MBCS_FROM_U_IS_ROUNDTRIP(stage2Entry, c) ( ((stage2Entry) & ((uint32_t)1<< (16+((c)&0xf)) )) !=0) + +#define MBCS_VALUE_2_FROM_STAGE_2(bytes, stage2Entry, c) ((uint16_t *)(bytes))[16*(uint32_t)(uint16_t)(stage2Entry)+((c)&0xf)] +#define MBCS_VALUE_4_FROM_STAGE_2(bytes, stage2Entry, c) ((uint32_t *)(bytes))[16*(uint32_t)(uint16_t)(stage2Entry)+((c)&0xf)] + +#define MBCS_POINTER_3_FROM_STAGE_2(bytes, stage2Entry, c) ((bytes)+(16*(uint32_t)(uint16_t)(stage2Entry)+((c)&0xf))*3) + +/* double-byte fromUnicode using the mbcsIndex */ +#define DBCS_RESULT_FROM_MOST_BMP(table, results, c) (results)[ (table)[(c)>>6] +((c)&0x3f) ] + +/* double-byte fromUTF8 using the mbcsIndex; l and t1 combined into lt1; lt1 and t2 must be masked externally */ +#define DBCS_RESULT_FROM_UTF8(table, results, lt1, t2) (results)[ (table)[lt1] +(t2) ] + + +/** + * MBCS output types for conversions from Unicode. + * These per-converter types determine the storage method in stage 3 of the lookup table, + * mostly how many bytes are stored per entry. + */ +enum { + MBCS_OUTPUT_1, /* 0 */ + MBCS_OUTPUT_2, /* 1 */ + MBCS_OUTPUT_3, /* 2 */ + MBCS_OUTPUT_4, /* 3 */ + + MBCS_OUTPUT_3_EUC=8, /* 8 */ + MBCS_OUTPUT_4_EUC, /* 9 */ + + MBCS_OUTPUT_2_SISO=12, /* c */ + MBCS_OUTPUT_2_HZ, /* d */ + + MBCS_OUTPUT_EXT_ONLY, /* e */ + + MBCS_OUTPUT_COUNT, + + MBCS_OUTPUT_DBCS_ONLY=0xdb /* runtime-only type for DBCS-only handling of SISO tables */ +}; + +/** + * Fallbacks to Unicode are stored outside the normal state table and code point structures + * in a vector of items of this type. They are sorted by offset. + */ +typedef struct { + uint32_t offset; + UChar32 codePoint; +} _MBCSToUFallback; + +/** Constants for fast and UTF-8-friendly conversion. */ +enum { + SBCS_FAST_MAX=0x0fff, /* maximum code point with UTF-8-friendly SBCS runtime code, see makeconv SBCS_UTF8_MAX */ + SBCS_FAST_LIMIT=SBCS_FAST_MAX+1, /* =0x1000 */ + MBCS_FAST_MAX=0xd7ff, /* maximum code point with UTF-8-friendly MBCS runtime code, see makeconv MBCS_UTF8_MAX */ + MBCS_FAST_LIMIT=MBCS_FAST_MAX+1 /* =0xd800 */ +}; + +/** + * This is the MBCS part of the UConverterTable union (a runtime data structure). + * It keeps all the per-converter data and points into the loaded mapping tables. + * + * utf8Friendly data structures added with _MBCSHeader.version 4.3 + */ +typedef struct UConverterMBCSTable { + /* toUnicode */ + uint8_t countStates, dbcsOnlyState, stateTableOwned; + uint32_t countToUFallbacks; + + const int32_t (*stateTable)/*[countStates]*/[256]; + int32_t (*swapLFNLStateTable)/*[countStates]*/[256]; /* for swaplfnl */ + const uint16_t *unicodeCodeUnits/*[countUnicodeResults]*/; + const _MBCSToUFallback *toUFallbacks; + + /* fromUnicode */ + const uint16_t *fromUnicodeTable; + const uint16_t *mbcsIndex; /* for fast conversion from most of BMP to MBCS (utf8Friendly data) */ + uint16_t sbcsIndex[SBCS_FAST_LIMIT>>6]; /* for fast conversion from low BMP to SBCS (utf8Friendly data) */ + const uint8_t *fromUnicodeBytes; + uint8_t *swapLFNLFromUnicodeBytes; /* for swaplfnl */ + uint32_t fromUBytesLength; + uint8_t outputType, unicodeMask; + UBool utf8Friendly; /* for utf8Friendly data */ + UChar maxFastUChar; /* for utf8Friendly data */ + + /* roundtrips */ + uint32_t asciiRoundtrips; + + /* reconstituted data that was omitted from the .cnv file */ + uint8_t *reconstitutedData; + + /* converter name for swaplfnl */ + char *swapLFNLName; + + /* extension data */ + struct UConverterSharedData *baseSharedData; + const int32_t *extIndexes; +} UConverterMBCSTable; + +#define UCNV_MBCS_TABLE_INITIALIZER { \ + /* toUnicode */ \ + 0, 0, 0, \ + 0, \ + \ + NULL, \ + NULL, \ + NULL, \ + NULL, \ + \ + /* fromUnicode */ \ + NULL, \ + NULL, \ + { 0 }, \ + NULL, \ + NULL, \ + 0, \ + 0, 0, \ + FALSE, \ + 0, \ + \ + /* roundtrips */ \ + 0, \ + \ + /* reconstituted data that was omitted from the .cnv file */ \ + NULL, \ + \ + /* converter name for swaplfnl */ \ + NULL, \ + \ + /* extension data */ \ + NULL, \ + NULL \ +} + +enum { + MBCS_OPT_LENGTH_MASK=0x3f, + MBCS_OPT_NO_FROM_U=0x40, + /* + * If any of the following options bits are set, + * then the file must be rejected. + */ + MBCS_OPT_INCOMPATIBLE_MASK=0xffc0, + /* + * Remove bits from this mask as more options are recognized + * by all implementations that use this constant. + */ + MBCS_OPT_UNKNOWN_INCOMPATIBLE_MASK=0xff80 +}; + +enum { + MBCS_HEADER_V4_LENGTH=8, + MBCS_HEADER_V5_MIN_LENGTH=9 +}; + +/** + * MBCS data header. See data format description above. + */ +typedef struct { + UVersionInfo version; + uint32_t countStates, + countToUFallbacks, + offsetToUCodeUnits, + offsetFromUTable, + offsetFromUBytes, + flags, + fromUBytesLength; + + /* new and required in version 5 */ + uint32_t options; + + /* new and optional in version 5; used if options&MBCS_OPT_NO_FROM_U */ + uint32_t fullStage2Length; /* number of 32-bit units */ +} _MBCSHeader; + +#define UCNV_MBCS_HEADER_INITIALIZER { { 0 }, 0, 0, 0, 0, 0, 0, 0, 0, 0 } + +/* + * This is a simple version of _MBCSGetNextUChar() that is used + * by other converter implementations. + * It only returns an "assigned" result if it consumes the entire input. + * It does not use state from the converter, nor error codes. + * It does not handle the EBCDIC swaplfnl option (set in UConverter). + * It handles conversion extensions but not GB 18030. + * + * Return value: + * U+fffe unassigned + * U+ffff illegal + * otherwise the Unicode code point + */ +U_CFUNC UChar32 +ucnv_MBCSSimpleGetNextUChar(UConverterSharedData *sharedData, + const char *source, int32_t length, + UBool useFallback); + +/** + * This version of _MBCSSimpleGetNextUChar() is optimized for single-byte, single-state codepages. + * It does not handle the EBCDIC swaplfnl option (set in UConverter). + * It does not handle conversion extensions (_extToU()). + */ +U_CFUNC UChar32 +ucnv_MBCSSingleSimpleGetNextUChar(UConverterSharedData *sharedData, + uint8_t b, UBool useFallback); + +/** + * This macro version of _MBCSSingleSimpleGetNextUChar() gets a code point from a byte. + * It works for single-byte, single-state codepages that only map + * to and from BMP code points, and it always + * returns fallback values. + */ +#define _MBCS_SINGLE_SIMPLE_GET_NEXT_BMP(sharedData, b) \ + (UChar)MBCS_ENTRY_FINAL_VALUE_16((sharedData)->mbcs.stateTable[0][(uint8_t)(b)]) + +/** + * This is an internal function that allows other converter implementations + * to check whether a byte is a lead byte. + */ +U_CFUNC UBool +ucnv_MBCSIsLeadByte(UConverterSharedData *sharedData, char byte); + +/** This is a macro version of _MBCSIsLeadByte(). */ +#define _MBCS_IS_LEAD_BYTE(sharedData, byte) \ + (UBool)MBCS_ENTRY_IS_TRANSITION((sharedData)->mbcs.stateTable[0][(uint8_t)(byte)]) + +/* + * This is another simple conversion function for internal use by other + * conversion implementations. + * It does not use the converter state nor call callbacks. + * It does not handle the EBCDIC swaplfnl option (set in UConverter). + * It handles conversion extensions but not GB 18030. + * + * It converts one single Unicode code point into codepage bytes, encoded + * as one 32-bit value. The function returns the number of bytes in *pValue: + * 1..4 the number of bytes in *pValue + * 0 unassigned (*pValue undefined) + * -1 illegal (currently not used, *pValue undefined) + * + * *pValue will contain the resulting bytes with the last byte in bits 7..0, + * the second to last byte in bits 15..8, etc. + * Currently, the function assumes but does not check that 0<=c<=0x10ffff. + */ +U_CFUNC int32_t +ucnv_MBCSFromUChar32(UConverterSharedData *sharedData, + UChar32 c, uint32_t *pValue, + UBool useFallback); + +/** + * This version of _MBCSFromUChar32() is optimized for single-byte codepages. + * It does not handle the EBCDIC swaplfnl option (set in UConverter). + * + * It returns the codepage byte for the code point, or -1 if it is unassigned. + */ +U_CFUNC int32_t +ucnv_MBCSSingleFromUChar32(UConverterSharedData *sharedData, + UChar32 c, + UBool useFallback); + +/** + * SBCS, DBCS, and EBCDIC_STATEFUL are replaced by MBCS, but + * we cheat a little about the type, returning the old types if appropriate. + */ +U_CFUNC UConverterType +ucnv_MBCSGetType(const UConverter* converter); + +U_CFUNC void +ucnv_MBCSFromUnicodeWithOffsets(UConverterFromUnicodeArgs *pArgs, + UErrorCode *pErrorCode); +U_CFUNC void +ucnv_MBCSToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs, + UErrorCode *pErrorCode); + +/* + * Internal function returning a UnicodeSet for toUnicode() conversion. + * Currently only used for ISO-2022-CN, and only handles roundtrip mappings. + * In the future, if we add support for fallback sets, this function + * needs to be updated. + * Handles extensions. + * Does not empty the set first. + */ +U_CFUNC void +ucnv_MBCSGetUnicodeSetForUnicode(const UConverterSharedData *sharedData, + const USetAdder *sa, + UConverterUnicodeSet which, + UErrorCode *pErrorCode); + +/* + * Same as ucnv_MBCSGetUnicodeSetForUnicode() but + * the set can be filtered by encoding scheme. + * Used by stateful converters which share regular conversion tables + * but only use a subset of their mappings. + */ +U_CFUNC void +ucnv_MBCSGetFilteredUnicodeSetForUnicode(const UConverterSharedData *sharedData, + const USetAdder *sa, + UConverterUnicodeSet which, + UConverterSetFilter filter, + UErrorCode *pErrorCode); + +#endif + +#endif |