215 lines
6.3 KiB
C
215 lines
6.3 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 2000, 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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* file name: ucnvmbcs.h
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2000jul07
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* created by: Markus W. Scherer
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*/
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#ifndef __UCNVMBCS_H__
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#define __UCNVMBCS_H__
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#include "unicode/utypes.h"
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#include "unicode/ucnv.h"
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/* MBCS converter data and state -------------------------------------------- */
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/**
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* MBCS action codes for conversions to Unicode.
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* These values are in bits 30..27 of the state table entries.
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*/
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enum {
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MBCS_STATE_ILLEGAL,
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MBCS_STATE_CHANGE_ONLY,
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MBCS_STATE_UNASSIGNED,
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MBCS_STATE_FALLBACK_DIRECT_16,
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MBCS_STATE_FALLBACK_DIRECT_20,
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MBCS_STATE_VALID_DIRECT_16,
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MBCS_STATE_VALID_DIRECT_20,
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MBCS_STATE_VALID_16,
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MBCS_STATE_VALID_16_PAIR
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};
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/**
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* MBCS output types for conversions from Unicode.
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* These per-converter types determine the storage method in stage 3 of the lookup table,
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* mostly how many bytes are stored per entry.
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*/
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enum {
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MBCS_OUTPUT_1, /* 0 */
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MBCS_OUTPUT_2, /* 1 */
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MBCS_OUTPUT_3, /* 2 */
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MBCS_OUTPUT_4, /* 3 */
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MBCS_OUTPUT_3_EUC=8, /* 8 */
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MBCS_OUTPUT_4_EUC, /* 9 */
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MBCS_OUTPUT_2_SISO=12, /* c */
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MBCS_OUTPUT_2_HZ /* d */
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};
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/**
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* Fallbacks to Unicode are stored outside the normal state table and code point structures
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* in a vector of items of this type. They are sorted by offset.
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*/
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typedef struct {
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uint32_t offset;
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UChar32 codePoint;
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} _MBCSToUFallback;
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/**
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* This is the MBCS part of the UConverterTable union (a runtime data structure).
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* It keeps all the per-converter data and points into the loaded mapping tables.
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*/
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typedef struct UConverterMBCSTable {
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/* toUnicode */
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uint8_t countStates;
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uint32_t countToUFallbacks;
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const int32_t (*stateTable)/*[countStates]*/[256];
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const uint16_t *unicodeCodeUnits/*[countUnicodeResults]*/;
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const _MBCSToUFallback *toUFallbacks;
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/* fromUnicode */
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const uint16_t *fromUnicodeTable;
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const uint8_t *fromUnicodeBytes;
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uint8_t outputType, unicodeMask;
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} UConverterMBCSTable;
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enum {
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MBCS_STAGE_2_MULTIPLIER=4
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};
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/**
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* MBCS data structure as part of a .cnv file:
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*
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* uint32_t [8]; -- 8 values:
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* 0 MBCS version in UVersionInfo format (1.0.0.0)
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* 1 countStates
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* 2 countToUFallbacks
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* 3 offsetToUCodeUnits (offsets are counted from the beginning of this header structure)
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* 4 offsetFromUTable
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* 5 offsetFromUBytes
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* 6 flags, bits:
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* 31.. 8 reserved
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* 7.. 0 outputType
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* 7 reserved
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*
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* stateTable[countStates][256];
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*
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* struct { (fallbacks are sorted by offset)
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* uint32_t offset;
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* UChar32 codePoint;
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* } toUFallbacks[countToUFallbacks];
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*
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* uint16_t unicodeCodeUnits[?]; (even number of units or padded)
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*
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* uint16_t fromUTable[0x440+?]; (32-bit-aligned)
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*
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* uint8_t fromUBytes[?];
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*/
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typedef struct {
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UVersionInfo version;
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uint32_t countStates,
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countToUFallbacks,
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offsetToUCodeUnits,
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offsetFromUTable,
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offsetFromUBytes,
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flags,
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reserved;
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} _MBCSHeader;
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/** Forward declaration to enable the following function declarations. */
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struct UConverterSharedData;
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/** Forward declaration to enable the following function declarations. */
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typedef struct UConverterSharedData UConverterSharedData;
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/**
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* This is a simple version of _MBCSGetNextUChar() that is used
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* by other converter implementations.
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* It does not use state from the converter, nor error codes.
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*
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* Return value:
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* U+fffe unassigned
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* U+ffff illegal
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* otherwise the Unicode code point
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*/
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U_CFUNC UChar32
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_MBCSSimpleGetNextUChar(UConverterSharedData *sharedData,
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const char **pSource, const char *sourceLimit,
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UBool useFallback);
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/** This version of _MBCSSimpleGetNextUChar() is optimized for single-byte, single-state codepages. */
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U_CFUNC UChar32
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_MBCSSingleSimpleGetNextUChar(UConverterSharedData *sharedData,
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uint8_t b, UBool useFallback);
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/**
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* This macro version of _MBCSSingleSimpleGetNextUChar() gets a code point from a byte.
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* It works for single-byte, single-state codepages that only map
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* to and from BMP code points, and it always
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* returns fallback values.
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*/
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#define _MBCS_SINGLE_SIMPLE_GET_NEXT_BMP(sharedData, b) \
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(UChar)(((sharedData)->table->mbcs.stateTable[0][(uint8_t)(b)])>>7)
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/**
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* This is an internal function that allows other converter implementations
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* to check whether a byte is a lead byte.
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*/
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U_CFUNC UBool
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_MBCSIsLeadByte(UConverterSharedData *sharedData, char byte);
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/** This is a macro version of _MBCSIsLeadByte(). */
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#define _MBCS_IS_LEAD_BYTE(sharedData, byte) \
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(UBool)((sharedData)->table->mbcs.stateTable[0][(uint8_t)(byte)]>=0)
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/**
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* This is another simple conversion function for internal use by other
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* conversion implementations.
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* It does not use the converter state nor call callbacks.
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* It converts one single Unicode code point into codepage bytes, encoded
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* as one 32-bit value. The function returns the number of bytes in *pValue:
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* 1..4 the number of bytes in *pValue
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* 0 unassigned (*pValue undefined)
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* -1 illegal (currently not used, *pValue undefined)
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*
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* *pValue will contain the resulting bytes with the last byte in bits 7..0,
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* the second to last byte in bits 15..8, etc.
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* Currently, the function assumes but does not check that 0<=c<=0x10ffff.
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*/
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U_CFUNC int32_t
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_MBCSFromUChar32(UConverterSharedData *sharedData,
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UChar32 c, uint32_t *pValue,
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UBool useFallback);
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/**
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* This version of _MBCSFromUChar32() is optimized for single-byte codepages.
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* It returns the codepage byte for the code point, or -1 if it is unassigned.
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*/
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U_CFUNC int32_t
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_MBCSSingleFromUChar32(UConverterSharedData *sharedData,
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UChar32 c,
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UBool useFallback);
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/**
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* SBCS, DBCS, and EBCDIC_STATEFUL are replaced by MBCS, but
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* we cheat a little about the type, returning the old types if appropriate.
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*/
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U_CFUNC UConverterType
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_MBCSGetType(const UConverter* converter);
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#endif
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