606 lines
23 KiB
C
606 lines
23 KiB
C
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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******************************************************************************
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*
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* Copyright (C) 2000-2013, 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: UTF-8
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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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#if !UCONFIG_NO_CONVERSION
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#include "unicode/ucnv.h"
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#include "ucnv_cnv.h"
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#include "ucnv_ext.h"
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/**
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* ICU conversion (.cnv) data file structure, following the usual UDataInfo
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* header.
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*
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* Format version: 6.2
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*
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* struct UConverterStaticData -- struct containing the converter name, IBM CCSID,
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* min/max bytes per character, etc.
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* see ucnv_bld.h
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*
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* --------------------
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*
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* The static data is followed by conversionType-specific data structures.
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* At the moment, there are only variations of MBCS converters. They all have
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* the same toUnicode structures, while the fromUnicode structures for SBCS
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* differ from those for other MBCS-style converters.
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*
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* _MBCSHeader.version 5 is optional and not backward-compatible
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* (as usual for changes in the major version field).
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*
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* Versions 5.m work like versions 4.m except:
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* - The _MBCSHeader has variable length (and is always longer than in version 4).
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* See the struct _MBCSHeader further description below.
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* - There is a set of flags which indicate further incompatible changes.
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* (Reader code must reject the file if it does not recognize them all.)
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* - In particular, one of these flags indicates that most of the fromUnicode
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* data is missing and must be reconstituted from the toUnicode data
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* and from the utf8Friendly mbcsIndex at load time.
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* (This only works with a utf8Friendly table.)
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* In this case, makeconv may increase maxFastUChar automatically to U+FFFF.
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*
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* The first of these versions is 5.3, which is like 4.3 except for the differences above.
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*
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* When possible, makeconv continues to generate version 4.m files.
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*
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* _MBCSHeader.version 5.4/4.4 supports "good one-way" mappings (|4)
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* in the extension tables (fromUTableValues bit 30). See ucnv_ext.h for details.
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*
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* _MBCSHeader.version 4.3 optionally modifies the fromUnicode data structures
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* slightly and optionally adds a table for conversion to MBCS (non-SBCS)
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* charsets.
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*
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* The modifications are to make the data utf8Friendly. Not every 4.3 file
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* file contains utf8Friendly data.
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* It is utf8Friendly if _MBCSHeader.version[2]!=0.
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* In this case, the data structures are utf8Friendly up to the code point
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* maxFastUChar=((_MBCSHeader.version[2]<<8)|0xff)
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*
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* A utf8Friendly file has fromUnicode stage 3 entries for code points up to
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* maxFastUChar allocated in blocks of 64 for indexing with the 6 bits from
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* a UTF-8 trail byte. ASCII is allocated linearly with 128 contiguous entries.
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*
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* In addition, a utf8Friendly MBCS file contains an additional
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* uint16_t mbcsIndex[(maxFastUChar+1)>>6];
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* which replaces the stage 1 and 2 tables for indexing with bits from the
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* UTF-8 lead byte and middle trail byte. Unlike the older MBCS stage 2 table,
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* the mbcsIndex does not contain roundtrip flags. Therefore, all fallbacks
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* from code points up to maxFastUChar (and roundtrips to 0x00) are moved to
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* the extension data structure. This also allows for faster roundtrip
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* conversion from UTF-16.
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*
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* SBCS files do not contain an additional sbcsIndex[] array because the
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* proportional size increase would be noticeable, but the runtime
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* code builds one for the code point range for which the runtime conversion
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* code is optimized.
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*
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* For SBCS, maxFastUChar should be at least U+0FFF. The initial makeconv
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* implementation sets it to U+1FFF. Because the sbcsIndex is not stored in
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* the file, a larger maxFastUChar only affects stage 3 block allocation size
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* and is free in empty blocks. (Larger blocks with sparse contents cause larger
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* files.) U+1FFF includes almost all of the small scripts.
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* U+0FFF covers UTF-8 two-byte sequences and three-byte sequences starting with
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* 0xe0. This includes most scripts with legacy SBCS charsets.
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* The initial runtime implementation using 4.3 files only builds an sbcsIndex
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* for code points up to U+0FFF.
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*
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* For MBCS, maxFastUChar should be at least U+D7FF (=initial value).
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* This boundary is convenient because practically all of the commonly used
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* characters are below it, and because it is the boundary to surrogate
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* code points, above which special handling is necessary anyway.
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* (Surrogate pair assembly for UTF-16, validity checking for UTF-8.)
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*
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* maxFastUChar could be up to U+FFFF to cover the whole BMP, which could be
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* useful especially for conversion from UTF-8 when the input can be assumed
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* to be valid, because the surrogate range would then not have to be
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* checked.
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* (With maxFastUChar=0xffff, makeconv would have to check for mbcsIndex value
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* overflow because with the all-unassigned block 0 and nearly full mappings
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* from the BMP it is theoretically possible that an index into stage 3
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* exceeds 16 bits.)
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*
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* _MBCSHeader.version 4.2 adds an optional conversion extension data structure.
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* If it is present, then an ICU version reading header versions 4.0 or 4.1
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* will be able to use the base table and ignore the extension.
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*
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* The unicodeMask in the static data is part of the base table data structure.
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* Especially, the UCNV_HAS_SUPPLEMENTARY flag determines the length of the
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* fromUnicode stage 1 array.
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* The static data unicodeMask refers only to the base table's properties if
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* a base table is included.
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* In an extension-only file, the static data unicodeMask is 0.
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* The extension data indexes have a separate field with the unicodeMask flags.
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*
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* MBCS-style data structure following the static data.
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* Offsets are counted in bytes from the beginning of the MBCS header structure.
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* Details about usage in comments in ucnvmbcs.c.
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*
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* struct _MBCSHeader (see the definition in this header file below)
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* contains 32-bit fields as follows:
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* 8 values:
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* 0 uint8_t[4] MBCS version in UVersionInfo format (currently 4.3.x.0)
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* 1 uint32_t countStates
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* 2 uint32_t countToUFallbacks
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* 3 uint32_t offsetToUCodeUnits
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* 4 uint32_t offsetFromUTable
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* 5 uint32_t offsetFromUBytes
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* 6 uint32_t flags, bits:
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* 31.. 8 offsetExtension -- _MBCSHeader.version 4.2 (ICU 2.8) and higher
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* 0 for older versions and if
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* there is not extension structure
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* 7.. 0 outputType
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* 7 uint32_t fromUBytesLength -- _MBCSHeader.version 4.1 (ICU 2.4) and higher
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* counts bytes in fromUBytes[]
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*
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* New and required in version 5:
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* 8 uint32_t options, bits:
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* 31..16 reserved for flags that can be added without breaking
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* backward compatibility
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* 15.. 6 reserved for flags whose addition will break
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* backward compatibility
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* 6 MBCS_OPT_FROM_U -- if set,
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* then most of the fromUnicode data is omitted;
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* fullStage2Length is present and the missing
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* bottom part of stage 2 must be reconstituted from
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* the toUnicode data;
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* stage 3 is missing completely as well;
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* not used for SBCS tables
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* 5.. 0 length of the _MBCSHeader (number of uint32_t)
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*
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* New and optional in version 5:
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* 9 uint32_t fullStage2Length: used if MBCS_OPT_FROM_U is set
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* specifies the full length of stage 2
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* including the omitted part
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*
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* if(outputType==MBCS_OUTPUT_EXT_ONLY) {
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* -- base table name for extension-only table
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* char baseTableName[variable]; -- with NUL plus padding for 4-alignment
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*
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* -- all _MBCSHeader fields except for version and flags are 0
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* } else {
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* -- normal base table with optional extension
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*
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* int32_t stateTable[countStates][256];
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*
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* struct _MBCSToUFallback { (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[(offsetFromUTable-offsetToUCodeUnits)/2];
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* (padded to an even number of units)
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*
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* -- stage 1 tables
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* if(staticData.unicodeMask&UCNV_HAS_SUPPLEMENTARY) {
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* -- stage 1 table for all of Unicode
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* uint16_t fromUTable[0x440]; (32-bit-aligned)
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* } else {
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* -- BMP-only tables have a smaller stage 1 table
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* uint16_t fromUTable[0x40]; (32-bit-aligned)
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* }
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*
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* -- stage 2 tables
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* length determined by top of stage 1 and bottom of stage 3 tables
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* if(outputType==MBCS_OUTPUT_1) {
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* -- SBCS: pure indexes
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* uint16_t stage 2 indexes[?];
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* } else {
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* -- DBCS, MBCS, EBCDIC_STATEFUL, ...: roundtrip flags and indexes
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* uint32_t stage 2 flags and indexes[?];
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* if(options&MBCS_OPT_NO_FROM_U) {
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* stage 2 really has length fullStage2Length
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* and the omitted lower part must be reconstituted from
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* the toUnicode data
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* }
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* }
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*
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* -- stage 3 tables with byte results
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* if(outputType==MBCS_OUTPUT_1) {
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* -- SBCS: each 16-bit result contains flags and the result byte, see ucnvmbcs.c
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* uint16_t fromUBytes[fromUBytesLength/2];
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* } else if(!(options&MBCS_OPT_NO_FROM_U)) {
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* -- DBCS, MBCS, EBCDIC_STATEFUL, ... 2/3/4 bytes result, see ucnvmbcs.c
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* uint8_t fromUBytes[fromUBytesLength]; or
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* uint16_t fromUBytes[fromUBytesLength/2]; or
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* uint32_t fromUBytes[fromUBytesLength/4];
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* } else {
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* fromUBytes[] must be reconstituted from the toUnicode data
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* }
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*
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* -- optional utf8Friendly mbcsIndex -- _MBCSHeader.version 4.3 (ICU 3.8) and higher
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* if(outputType!=MBCS_OUTPUT_1 &&
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* _MBCSHeader.version[1]>=3 &&
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* (maxFastUChar=_MBCSHeader.version[2])!=0
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* ) {
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* maxFastUChar=(maxFastUChar<<8)|0xff;
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* uint16_t mbcsIndex[(maxFastUChar+1)>>6];
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* }
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* }
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*
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* -- extension table, details see ucnv_ext.h
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* int32_t indexes[>=32]; ...
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*/
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/* MBCS converter data and state -------------------------------------------- */
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enum {
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MBCS_MAX_STATE_COUNT=128
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};
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/**
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* MBCS action codes for conversions to Unicode.
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* These values are in bits 23..20 of the state table entries.
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*/
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enum {
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MBCS_STATE_VALID_DIRECT_16,
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MBCS_STATE_VALID_DIRECT_20,
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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_16,
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MBCS_STATE_VALID_16_PAIR,
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MBCS_STATE_UNASSIGNED,
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MBCS_STATE_ILLEGAL,
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MBCS_STATE_CHANGE_ONLY
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};
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/* Macros for state table entries */
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#define MBCS_ENTRY_TRANSITION(state, offset) (int32_t)(((int32_t)(state)<<24L)|(offset))
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#define MBCS_ENTRY_TRANSITION_SET_OFFSET(entry, offset) (int32_t)(((entry)&0xff000000)|(offset))
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#define MBCS_ENTRY_TRANSITION_ADD_OFFSET(entry, offset) (int32_t)((entry)+(offset))
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#define MBCS_ENTRY_FINAL(state, action, value) (int32_t)(0x80000000|((int32_t)(state)<<24L)|((action)<<20L)|(value))
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#define MBCS_ENTRY_SET_FINAL(entry) (int32_t)((entry)|0x80000000)
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#define MBCS_ENTRY_FINAL_SET_ACTION(entry, action) (int32_t)(((entry)&0xff0fffff)|((int32_t)(action)<<20L))
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#define MBCS_ENTRY_FINAL_SET_VALUE(entry, value) (int32_t)(((entry)&0xfff00000)|(value))
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#define MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, action, value) (int32_t)(((entry)&0xff000000)|((int32_t)(action)<<20L)|(value))
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#define MBCS_ENTRY_SET_STATE(entry, state) (int32_t)(((entry)&0x80ffffff)|((int32_t)(state)<<24L))
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#define MBCS_ENTRY_STATE(entry) ((((uint32_t)entry)>>24)&0x7f)
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#define MBCS_ENTRY_IS_TRANSITION(entry) ((entry)>=0)
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#define MBCS_ENTRY_IS_FINAL(entry) ((entry)<0)
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#define MBCS_ENTRY_TRANSITION_STATE(entry) (((uint32_t)entry)>>24)
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#define MBCS_ENTRY_TRANSITION_OFFSET(entry) ((entry)&0xffffff)
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#define MBCS_ENTRY_FINAL_STATE(entry) ((((uint32_t)entry)>>24)&0x7f)
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#define MBCS_ENTRY_FINAL_IS_VALID_DIRECT_16(entry) ((entry)<(int32_t)0x80100000)
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#define MBCS_ENTRY_FINAL_ACTION(entry) ((((uint32_t)entry)>>20)&0xf)
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#define MBCS_ENTRY_FINAL_VALUE(entry) ((entry)&0xfffff)
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#define MBCS_ENTRY_FINAL_VALUE_16(entry) (uint16_t)(entry)
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#define IS_ASCII_ROUNDTRIP(b, asciiRoundtrips) (((asciiRoundtrips) & (1<<((b)>>2)))!=0)
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/* single-byte fromUnicode: get the 16-bit result word */
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#define MBCS_SINGLE_RESULT_FROM_U(table, results, c) (results)[ (table)[ (table)[(c)>>10] +(((c)>>4)&0x3f) ] +((c)&0xf) ]
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/* single-byte fromUnicode using the sbcsIndex */
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#define SBCS_RESULT_FROM_LOW_BMP(table, results, c) (results)[ (table)[(c)>>6] +((c)&0x3f) ]
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/* single-byte fromUTF8 using the sbcsIndex; l and t must be masked externally; can be l=0 and t<=0x7f */
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#define SBCS_RESULT_FROM_UTF8(table, results, l, t) (results)[ (table)[l] +(t) ]
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/* multi-byte fromUnicode: get the 32-bit stage 2 entry */
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#define MBCS_STAGE_2_FROM_U(table, c) ((const uint32_t *)(table))[ (table)[(c)>>10] +(((c)>>4)&0x3f) ]
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#define MBCS_FROM_U_IS_ROUNDTRIP(stage2Entry, c) ( ((stage2Entry) & ((uint32_t)1<< (16+((c)&0xf)) )) !=0)
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#define MBCS_VALUE_2_FROM_STAGE_2(bytes, stage2Entry, c) ((uint16_t *)(bytes))[16*(uint32_t)(uint16_t)(stage2Entry)+((c)&0xf)]
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#define MBCS_VALUE_4_FROM_STAGE_2(bytes, stage2Entry, c) ((uint32_t *)(bytes))[16*(uint32_t)(uint16_t)(stage2Entry)+((c)&0xf)]
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#define MBCS_POINTER_3_FROM_STAGE_2(bytes, stage2Entry, c) ((bytes)+(16*(uint32_t)(uint16_t)(stage2Entry)+((c)&0xf))*3)
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/* double-byte fromUnicode using the mbcsIndex */
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#define DBCS_RESULT_FROM_MOST_BMP(table, results, c) (results)[ (table)[(c)>>6] +((c)&0x3f) ]
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/* double-byte fromUTF8 using the mbcsIndex; l and t1 combined into lt1; lt1 and t2 must be masked externally */
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#define DBCS_RESULT_FROM_UTF8(table, results, lt1, t2) (results)[ (table)[lt1] +(t2) ]
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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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MBCS_OUTPUT_EXT_ONLY, /* e */
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MBCS_OUTPUT_COUNT,
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MBCS_OUTPUT_DBCS_ONLY=0xdb /* runtime-only type for DBCS-only handling of SISO tables */
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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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/** Constants for fast and UTF-8-friendly conversion. */
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enum {
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SBCS_FAST_MAX=0x0fff, /* maximum code point with UTF-8-friendly SBCS runtime code, see makeconv SBCS_UTF8_MAX */
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SBCS_FAST_LIMIT=SBCS_FAST_MAX+1, /* =0x1000 */
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MBCS_FAST_MAX=0xd7ff, /* maximum code point with UTF-8-friendly MBCS runtime code, see makeconv MBCS_UTF8_MAX */
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MBCS_FAST_LIMIT=MBCS_FAST_MAX+1 /* =0xd800 */
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};
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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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* utf8Friendly data structures added with _MBCSHeader.version 4.3
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*/
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typedef struct UConverterMBCSTable {
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/* toUnicode */
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uint8_t countStates, dbcsOnlyState, stateTableOwned;
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uint32_t countToUFallbacks;
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const int32_t (*stateTable)/*[countStates]*/[256];
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int32_t (*swapLFNLStateTable)/*[countStates]*/[256]; /* for swaplfnl */
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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 uint16_t *mbcsIndex; /* for fast conversion from most of BMP to MBCS (utf8Friendly data) */
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uint16_t sbcsIndex[SBCS_FAST_LIMIT>>6]; /* for fast conversion from low BMP to SBCS (utf8Friendly data) */
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const uint8_t *fromUnicodeBytes;
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uint8_t *swapLFNLFromUnicodeBytes; /* for swaplfnl */
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uint32_t fromUBytesLength;
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uint8_t outputType, unicodeMask;
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UBool utf8Friendly; /* for utf8Friendly data */
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UChar maxFastUChar; /* for utf8Friendly data */
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/* roundtrips */
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uint32_t asciiRoundtrips;
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/* reconstituted data that was omitted from the .cnv file */
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uint8_t *reconstitutedData;
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/* converter name for swaplfnl */
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char *swapLFNLName;
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/* extension data */
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struct UConverterSharedData *baseSharedData;
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const int32_t *extIndexes;
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} UConverterMBCSTable;
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#define UCNV_MBCS_TABLE_INITIALIZER { \
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/* toUnicode */ \
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0, 0, 0, \
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0, \
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\
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NULL, \
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|
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
|