| /* |
| ****************************************************************************** |
| * |
| * 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 |
