/* ****************************************************************************** * * Copyright (C) 2000-2004, 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" /** * 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 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 4.2.0.0) * 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[] * * 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[?]; * } * * -- 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 { * -- 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]; * } * } * * -- 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) (((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) ((entry)>>24) #define MBCS_ENTRY_TRANSITION_OFFSET(entry) ((entry)&0xffffff) #define MBCS_ENTRY_FINAL_STATE(entry) (((entry)>>24)&0x7f) #define MBCS_ENTRY_FINAL_IS_VALID_DIRECT_16(entry) ((entry)<(int32_t)0x80100000) #define MBCS_ENTRY_FINAL_ACTION(entry) (((entry)>>20)&0xf) #define MBCS_ENTRY_FINAL_VALUE(entry) ((entry)&0xfffff) #define MBCS_ENTRY_FINAL_VALUE_16(entry) (uint16_t)(entry) /* 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) ] /* 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) /** * 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; /** * 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. */ 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 uint8_t *fromUnicodeBytes; uint8_t *swapLFNLFromUnicodeBytes; /* for swaplfnl */ uint32_t fromUBytesLength; uint8_t outputType, unicodeMask; /* converter name for swaplfnl */ char *swapLFNLName; /* extension data */ struct UConverterSharedData *baseSharedData; const int32_t *extIndexes; } UConverterMBCSTable; /** * MBCS data header. See data format description above. */ typedef struct { UVersionInfo version; uint32_t countStates, countToUFallbacks, offsetToUCodeUnits, offsetFromUTable, offsetFromUBytes, flags, fromUBytesLength; } _MBCSHeader; /* * 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 reverse-fallback sets, this function * needs to be updated, and called for each initial state. * Does not currently handle extensions. * Does not empty the set first. */ U_CFUNC void ucnv_MBCSGetUnicodeSetForBytes(const UConverterSharedData *sharedData, USetAdder *sa, UConverterUnicodeSet which, uint8_t state, int32_t lowByte, int32_t highByte, 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, USetAdder *sa, UConverterUnicodeSet which, UErrorCode *pErrorCode); #endif #endif