2140 lines
81 KiB
C
2140 lines
81 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.c
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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: 2000jul03
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* created by: Markus W. Scherer
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*
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* The current code in this file replaces the previous implementation
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* of conversion code from multi-byte codepages to Unicode and back.
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* This implementation supports the following:
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* - legacy variable-length codepages with up to 4 bytes per character
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* - all Unicode code points (up to 0x10ffff)
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* - efficient distinction of unassigned vs. illegal byte sequences
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* - it is possible in fromUnicode() to directly deal with simple
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* stateful encodings
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* - it is possible to convert Unicode code points other than U+0000
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* to a single zero byte (but not as a fallback)
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*
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* Remaining limitations in fromUnicode:
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* - byte sequences must not have leading zero bytes
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* - no fallback mapping from Unicode to a zero byte
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* - limitation to up to 4 bytes per character
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*/
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#include "unicode/utypes.h"
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#include "unicode/ucnv.h"
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#include "unicode/ucnv_cb.h"
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#include "ucnv_bld.h"
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#include "ucnvmbcs.h"
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#include "ucnv_cnv.h"
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#include "cstring.h"
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/*
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* Converting stateless codepage data
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* (or codepage data with simple states) to Unicode.
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*
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* Data structure and algorithm for converting from complex legacy codepages
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* to Unicode. (Designed before 2000-may-22.)
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*
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* The basic idea is that the structure of legacy codepages can be described
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* with state tables.
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* When reading a byte stream, each input byte causes a state transition.
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* Some transitions result in the output of a code point, some result in
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* "unassigned" or "illegal" output.
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* This is used here for character conversion.
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*
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* The data structure begins with a state table consisting of a row
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* per state, with 256 entries (columns) per row for each possible input
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* byte value.
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* Each entry is 32 bits wide, with the lower 7 bits containing the next state.
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* State 0 is the initial state.
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*
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* Bit 31 of each entry indicates whether the state is
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* terminal (bit 31 set) or not.
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*
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* Most of the time, the offset values of subsequent states are added
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* up to a scalar value. This value will eventually be the index of
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* the Unicode code point in a table that follows the state table.
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* The effect is that the code points for final state table rows
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* are contiguous. The code points of final state rows follow each other
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* in the order of the references to those final states by previous
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* states, etc.
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*
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* For some terminal states, the offset is itself the output Unicode
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* code point (16 bits for a BMP code point or 20 bits for a code point
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* that is written as a surrogate pair).
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* For others, the code point in the Unicode table is stored with either
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* one or two code units: one for BMP code points, two for a pair of
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* surrogates.
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* All code points for a final table take up the same number of code
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* units, regardless of whether they all actually _use_ the same number
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* of code units. This is necessary for simple array access.
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*
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* An additional feature comes in with what in ICU is called "fallback"
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* mappings:
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* In addition to round-trippable, precise, 1:1 mappings, there are often
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* mappings defined between similar, though not the same, characters.
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* Typically, such mappings occur only in fromUnicode mapping tables because
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* Unicode has a superset repertoire of most other codepages. However, it
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* is possible to provide such mappings in the toUnicode tables, too.
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* In this case, the fallback mappings are partly integrated into the
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* general state tables because the structure of the encoding includes their
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* byte sequences. They are optional mappings when the main mapping is
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* "unassigned", and are looked up by the scalar offset of the main mapping
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* in a separate table. Only when the main mapping does not have such a
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* scalar offset, i.e., in the case of action codes 5 of 6 below (valid-direct),
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* would there need to be some different mechanism. Therefore, there are
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* separate action codes 3 and 4 (fallback-direct) especially for that.
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* The "unassigned" action code 2 cannot be used for fallback lookups because
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* it also does not result in a scalar offset. This means that fallback mappings
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* require to fit into either fallback-direct action codes or valid-single or
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* valid-pair codes that result in scalar offsets.
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* "Unassigned" really means "structurally unassigned".
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*
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* The interpretation of the bits in each entry is as follows:
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*
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* Bit 31 not set, not a terminal entry:
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* 30..7 offset delta, to be added up
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* 6..0 next state
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*
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* Bit 31 set, terminal entry:
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* 30..27 action code:
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* 0 illegal byte sequence
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* 26..7 not used, 0
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* 1 state change only
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* 26..7 not used, 0
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* useful for state changes in simple stateful encodings,
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* at Shift-In/Shift-Out codes
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* 2 unassigned byte sequence
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* 26..7 not used, 0
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* this does not contain a final offset delta because the main
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* purpose of this action code is to save scalar offset values;
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* therefore, fallback values cannot be assigned to byte
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* sequences that result in this action code - use codes 5 or 6
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* 3 valid byte sequence (fallback)
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* 22..7 16-bit Unicode BMP code point as fallback result
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* 4 valid byte sequence (fallback)
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* 26..7 20-bit Unicode surrogate code point as fallback result
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*
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* action codes 5, 6, 7, and 8 result in precise-mapping Unicode code points
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* 5 valid byte sequence
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* 22..7 16-bit Unicode BMP code point
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* never U+fffe or U+ffff (use action codes 0, 2, 3 or 4 for that)
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* 6 valid byte sequence
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* 26..7 20-bit Unicode surrogate code point
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* never U+fffe or U+ffff (use action codes 0, 2, 3 or 4 for that)
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*
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* action codes 7 and 8 may result in U+fffe (unassigned), in which case the
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* final offset is to be looked up in a special fallback table
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* 7 valid byte sequence
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* 26..16 not used, 0
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* 15..7 final offset delta
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* pointing to one 16-bit code unit
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* which may be U+fffe (unassigned) or U+ffff (illegal)
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* 8 valid byte sequence
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* 26..16 not used, 0
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* 15..7 final offset delta
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* pointing to two 16-bit code units
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* (UTF-16 surrogates)
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* the first code unit either is a lead surrogate and indicates
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* an assigned surrogate pair, or it is a single unit
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* which may be U+fffe (unassigned) or U+ffff (illegal)
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* (the final offset deltas are at most 255 * 2,
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* times 2 because of storing code unit pairs)
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* 9..15 reserved for future use
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* current implementations will only perform a state change
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* and ignore bits 26..7
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* 6..0 next state (regardless of action code)
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*
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* An encoding with contiguous ranges of unassigned byte sequences, like
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* Shift-JIS and especially EUC-TW, can be stored efficiently by having
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* at least two states for the trail bytes:
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* One trail byte state that results in code points, and one that only
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* has "unassigned" and "illegal" terminal states.
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*
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* Note: partly by accident, this data structure supports simple stateless
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* encodings without any additional logic.
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* Especially simple Shift-In/Shift-Out schemes could be handled with
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* appropriate state tables (especially EBCDIC_STATEFUL!).
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*/
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/* prototypes --------------------------------------------------------------- */
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U_CFUNC void
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_MBCSSingleToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs,
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UErrorCode *pErrorCode);
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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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U_CFUNC void
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_MBCSSingleFromUnicodeWithOffsets(UConverterFromUnicodeArgs *pArgs,
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UErrorCode *pErrorCode);
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static const uint32_t
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gb18030Ranges[13][4];
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static void
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fromUCallback(UConverter *cnv,
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void *context, UConverterFromUnicodeArgs *pArgs,
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const UChar *codeUnits, int32_t length, UChar32 codePoint,
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UConverterCallbackReason reason, UErrorCode *pErrorCode);
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static void
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toUCallback(UConverter *cnv,
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void *context, UConverterToUnicodeArgs *pArgs,
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const char *codeUnits, int32_t length,
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UConverterCallbackReason reason, UErrorCode *pErrorCode);
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/* MBCS setup functions ----------------------------------------------------- */
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U_CFUNC void
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_MBCSLoad(UConverterSharedData *sharedData,
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const uint8_t *raw,
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UErrorCode *pErrorCode) {
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UConverterMBCSTable *mbcsTable=&sharedData->table->mbcs;
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_MBCSHeader *header=(_MBCSHeader *)raw;
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if(header->version[0]!=1) {
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*pErrorCode=U_INVALID_TABLE_FORMAT;
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return;
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}
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mbcsTable->countStates=(uint8_t)header->countStates;
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mbcsTable->countToUFallbacks=header->countToUFallbacks;
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mbcsTable->stateTable=(const int32_t (*)[256])(raw+sizeof(_MBCSHeader));
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mbcsTable->toUFallbacks=(const _MBCSToUFallback *)(mbcsTable->stateTable+header->countStates);
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mbcsTable->unicodeCodeUnits=(const uint16_t *)(raw+header->offsetToUCodeUnits);
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mbcsTable->fromUnicodeTable=(const uint16_t *)(raw+header->offsetFromUTable);
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mbcsTable->fromUnicodeBytes=(const uint8_t *)(raw+header->offsetFromUBytes);
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mbcsTable->outputType=(uint8_t)header->flags;
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}
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U_CFUNC void
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_MBCSReset(UConverter *cnv) {
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/* toUnicode */
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cnv->toUnicodeStatus=0;
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cnv->mode=0;
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cnv->toULength=0;
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/* fromUnicode */
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cnv->fromUSurrogateLead=0;
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}
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U_CFUNC void
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_MBCSOpen(UConverter *cnv,
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const char *name,
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const char *locale,
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uint32_t *version,
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UErrorCode *pErrorCode) {
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_MBCSReset(cnv);
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if(uprv_strstr(name, "gb18030")!=NULL || uprv_strstr(name, "GB18030")!=NULL) {
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/* set a flag for GB 18030 mode, which changes the callback behavior */
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cnv->extraInfo=(void *)gb18030Ranges;
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}
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}
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/* MBCS-to-Unicode conversion functions ------------------------------------- */
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static UChar32
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_MBCSGetFallback(UConverterMBCSTable *mbcsTable, uint32_t offset) {
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const _MBCSToUFallback *toUFallbacks;
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uint32_t i, start, limit;
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limit=mbcsTable->countToUFallbacks;
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if(limit>0) {
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/* do a binary search for the fallback mapping */
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toUFallbacks=mbcsTable->toUFallbacks;
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start=0;
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while(start<limit-1) {
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i=(start+limit)/2;
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if(offset<toUFallbacks[i].offset) {
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limit=i;
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} else {
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start=i;
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}
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}
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/* did we really find it? */
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if(offset==toUFallbacks[start].offset) {
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return toUFallbacks[start].codePoint;
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}
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}
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return 0xfffe;
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}
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U_CFUNC void
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_MBCSToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs,
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UErrorCode *pErrorCode) {
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/* set up the local pointers */
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UConverter *cnv;
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const uint8_t *source, *sourceLimit;
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UChar *target;
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const UChar *targetLimit;
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int32_t *offsets;
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const int32_t (*stateTable)[256];
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const uint16_t *unicodeCodeUnits;
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uint32_t offset;
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uint8_t state;
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int8_t byteIndex;
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uint8_t *bytes;
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int32_t sourceIndex, nextSourceIndex;
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int32_t entry;
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UChar c;
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uint8_t b;
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UConverterCallbackReason reason;
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/* use optimized function if possible */
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cnv=pArgs->converter;
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if(cnv->sharedData->table->mbcs.countStates==1) {
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_MBCSSingleToUnicodeWithOffsets(pArgs, pErrorCode);
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return;
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}
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/* set up the local pointers */
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source=(const uint8_t *)pArgs->source;
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sourceLimit=(const uint8_t *)pArgs->sourceLimit;
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target=pArgs->target;
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targetLimit=pArgs->targetLimit;
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offsets=pArgs->offsets;
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stateTable=cnv->sharedData->table->mbcs.stateTable;
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unicodeCodeUnits=cnv->sharedData->table->mbcs.unicodeCodeUnits;
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/* get the converter state from UConverter */
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offset=cnv->toUnicodeStatus;
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state=(uint8_t)(cnv->mode);
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byteIndex=cnv->toULength;
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bytes=cnv->toUBytes;
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/* sourceIndex=-1 if the current character began in the previous buffer */
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sourceIndex=byteIndex==0 ? 0 : -1;
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nextSourceIndex=0;
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|
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/* conversion loop */
|
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while(source<sourceLimit) {
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/*
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* This following test is to see if available input would overflow the output.
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* It does not catch output of more than one code unit that
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* overflows as a result of a surrogate pair or callback output
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* from the last source byte.
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* Therefore, those situations also test for overflows and will
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* then break the loop, too.
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*/
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if(target<targetLimit) {
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bytes[byteIndex++]=b=*source++;
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++nextSourceIndex;
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entry=stateTable[state][b];
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if(entry>=0) {
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/*
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* bit 31 is not set, bits:
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* 30..7 offset delta
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* 6..0 next state
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*/
|
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state=(uint8_t)(entry&0x7f);
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offset+=entry>>7;
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} else {
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/*
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* bit 31 is set, bits:
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* 30..27 action code
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* (do not mask out bit 31 for speed, include it in action values)
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* 26..7 depend on the action code
|
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* 6..0 next state
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*/
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/* set the next state early so that we can reuse the entry variable */
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state=(uint8_t)(entry&0x7f); /* typically 0 */
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|
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/* switch per action code */
|
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switch((uint32_t)entry>>27U) {
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case 16|MBCS_STATE_ILLEGAL:
|
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/* bits 26..7 are not used, 0 */
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/* callback(illegal) */
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reason=UCNV_ILLEGAL;
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*pErrorCode=U_ILLEGAL_CHAR_FOUND;
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goto callback;
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|
case 16|MBCS_STATE_CHANGE_ONLY:
|
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/* bits 26..7 are not used, 0 */
|
|
/*
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* This serves as a state change without any output.
|
|
* It is useful for reading simple stateful encodings,
|
|
* for example using just Shift-In/Shift-Out codes.
|
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* The 21 unused bits may later be used for more sophisticated
|
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* state transitions.
|
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*/
|
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break;
|
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case 16|MBCS_STATE_UNASSIGNED:
|
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/* bits 26..7 are not used, 0 */
|
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/* callback(unassigned) */
|
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reason=UCNV_UNASSIGNED;
|
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*pErrorCode=U_INVALID_CHAR_FOUND;
|
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goto callback;
|
|
case 16|MBCS_STATE_FALLBACK_DIRECT_16:
|
|
/* bits 26..23 are not used, 0 */
|
|
/* bits 22..7 contain the Unicode BMP code point */
|
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if(!UCNV_TO_U_USE_FALLBACK(cnv)) {
|
|
/* callback(unassigned) */
|
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reason=UCNV_UNASSIGNED;
|
|
*pErrorCode=U_INVALID_CHAR_FOUND;
|
|
goto callback;
|
|
}
|
|
/* fall through to the MBCS_STATE_VALID_DIRECT_16 branch */
|
|
case 16|MBCS_STATE_VALID_DIRECT_16:
|
|
/* bits 26..23 are not used, 0 */
|
|
/* bits 22..7 contain the Unicode BMP code point */
|
|
/* output BMP code point */
|
|
*target++=(UChar)(entry>>7);
|
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if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
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}
|
|
break;
|
|
case 16|MBCS_STATE_FALLBACK_DIRECT_20:
|
|
/* bits 26..7 contain the Unicode surrogate code point minus 0x10000 */
|
|
if(!UCNV_TO_U_USE_FALLBACK(cnv)) {
|
|
/* callback(unassigned) */
|
|
reason=UCNV_UNASSIGNED;
|
|
*pErrorCode=U_INVALID_CHAR_FOUND;
|
|
goto callback;
|
|
}
|
|
/* fall through to the MBCS_STATE_VALID_DIRECT_20 branch */
|
|
case 16|MBCS_STATE_VALID_DIRECT_20:
|
|
/* bits 26..7 contain the Unicode surrogate code point minus 0x10000 */
|
|
entry=(entry>>7)&0xfffff;
|
|
/* output surrogate pair */
|
|
*target++=(UChar)(0xd800|(UChar)(entry>>10));
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
c=(UChar)(0xdc00|(UChar)(entry&0x3ff));
|
|
if(target<targetLimit) {
|
|
*target++=c;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
} else {
|
|
/* target overflow */
|
|
cnv->UCharErrorBuffer[0]=c;
|
|
cnv->UCharErrorBufferLength=1;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
|
|
offset=0;
|
|
byteIndex=0;
|
|
goto endloop;
|
|
}
|
|
break;
|
|
case 16|MBCS_STATE_VALID_16:
|
|
/* bits 26..16 are not used, 0 */
|
|
/* bits 15..7 contain the final offset delta to one 16-bit code unit */
|
|
offset+=(uint16_t)entry>>7;
|
|
c=unicodeCodeUnits[offset];
|
|
if(c<0xfffe) {
|
|
/* output BMP code point */
|
|
*target++=c;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
} else if(c==0xfffe) {
|
|
if(UCNV_TO_U_USE_FALLBACK(cnv) && (entry=(int32_t)_MBCSGetFallback(&cnv->sharedData->table->mbcs, offset))!=0xfffe) {
|
|
goto output32;
|
|
}
|
|
/* callback(unassigned) */
|
|
reason=UCNV_UNASSIGNED;
|
|
*pErrorCode=U_INVALID_CHAR_FOUND;
|
|
goto callback;
|
|
} else {
|
|
/* callback(illegal) */
|
|
reason=UCNV_ILLEGAL;
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
goto callback;
|
|
}
|
|
break;
|
|
case 16|MBCS_STATE_VALID_16_PAIR:
|
|
/* bits 26..16 are not used, 0 */
|
|
/* bits 15..7 contain the final offset delta to two 16-bit code units */
|
|
offset+=(uint16_t)entry>>7;
|
|
c=unicodeCodeUnits[offset++];
|
|
if(UTF_IS_FIRST_SURROGATE(c)) {
|
|
*target++=c;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
if(target<targetLimit) {
|
|
*target++=unicodeCodeUnits[offset];
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
} else {
|
|
/* target overflow */
|
|
cnv->UCharErrorBuffer[0]=unicodeCodeUnits[offset];
|
|
cnv->UCharErrorBufferLength=1;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
|
|
offset=0;
|
|
byteIndex=0;
|
|
goto endloop;
|
|
}
|
|
} else if(c<0xfffe) {
|
|
/* output BMP code point */
|
|
*target++=c;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
} else if(c==0xfffe) {
|
|
/*
|
|
* For the fallback, we need to restore the offset that
|
|
* we had before the unicodeCodeUnits[offset++] above that incremented it!
|
|
*/
|
|
if(UCNV_TO_U_USE_FALLBACK(cnv) && (entry=(int32_t)_MBCSGetFallback(&cnv->sharedData->table->mbcs, offset-1))!=0xfffe) {
|
|
goto output32;
|
|
}
|
|
/* callback(unassigned) */
|
|
reason=UCNV_UNASSIGNED;
|
|
*pErrorCode=U_INVALID_CHAR_FOUND;
|
|
goto callback;
|
|
} else {
|
|
/* callback(illegal) */
|
|
reason=UCNV_ILLEGAL;
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
goto callback;
|
|
}
|
|
break;
|
|
default:
|
|
/* reserved, must never occur */
|
|
/* bits 26..7 are not used, 0 */
|
|
break;
|
|
}
|
|
|
|
/* normal end of action codes: prepare for a new character */
|
|
offset=0;
|
|
byteIndex=0;
|
|
sourceIndex=nextSourceIndex;
|
|
continue;
|
|
|
|
/*
|
|
* Markus Scherer 2000-jul-05
|
|
*
|
|
* The following is extremely ugly, and I apologize for it:
|
|
* Several places in the above switch statement need to call
|
|
* a callback function or output a 32-bit code point,
|
|
* each of which is an involved process with
|
|
* a couple dozen of statements.
|
|
*
|
|
* I could do this in a function call, but I fear that then
|
|
* the compiler does not keep the frequently used variables in
|
|
* registers because the function call would need them on the stack
|
|
* for input and output.
|
|
*
|
|
* I could do this with a macro, but that is harder to debug and
|
|
* bloats the compiled code.
|
|
*
|
|
* I could just copy and paste the code, but that would also bloat
|
|
* the program size, make the pieces harder to maintain, and make
|
|
* the switch statement extremely long and clumsy.
|
|
*
|
|
* Therefore, those places goto here and do it all in one place,
|
|
* while the normal processing has a continue above and skips this
|
|
* part.
|
|
* This actually _saves_ goto statements, too:
|
|
* Since it is not possible in C to break a loop from within a switch
|
|
* statement, the callback code in the switch statement would have to
|
|
* goto behind the loop. Here, it can break if necessary.
|
|
*/
|
|
|
|
output32:
|
|
/* output a 32-bit (21-bit) Unicode code point stored in entry */
|
|
if(entry<=0xffff) {
|
|
/* output BMP code point */
|
|
*target++=(UChar)entry;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
} else {
|
|
/* output surrogate pair */
|
|
*target++=(UChar)(0xd7c0+(entry>>10));
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
c=(UChar)(0xdc00|(UChar)(entry&0x3ff));
|
|
if(target<targetLimit) {
|
|
*target++=c;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
} else {
|
|
/* target overflow */
|
|
cnv->UCharErrorBuffer[0]=c;
|
|
cnv->UCharErrorBufferLength=1;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
|
|
offset=0;
|
|
byteIndex=0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* same as normal end of action codes: prepare for a new character */
|
|
offset=0;
|
|
byteIndex=0;
|
|
sourceIndex=nextSourceIndex;
|
|
continue;
|
|
|
|
callback:
|
|
/* call the callback function with all the preparations and post-processing */
|
|
/* update the arguments structure */
|
|
pArgs->source=(const char *)source;
|
|
pArgs->target=target;
|
|
pArgs->offsets=offsets;
|
|
|
|
/* copy the current bytes to invalidCharBuffer */
|
|
for(b=0; b<(uint8_t)byteIndex; ++b) {
|
|
cnv->invalidCharBuffer[b]=(char)bytes[b];
|
|
}
|
|
cnv->invalidCharLength=byteIndex;
|
|
|
|
/* set the converter state in UConverter to deal with the next character */
|
|
cnv->toUnicodeStatus=0;
|
|
cnv->mode=state;
|
|
cnv->toULength=0;
|
|
|
|
/* call the callback function */
|
|
toUCallback(cnv, cnv->toUContext, pArgs, (const char *)bytes, byteIndex, reason, pErrorCode);
|
|
|
|
/* get the converter state from UConverter */
|
|
offset=cnv->toUnicodeStatus;
|
|
state=(uint8_t)cnv->mode;
|
|
byteIndex=cnv->toULength;
|
|
|
|
/* update target and deal with offsets if necessary */
|
|
offsets=ucnv_updateCallbackOffsets(offsets, pArgs->target-target, sourceIndex);
|
|
target=pArgs->target;
|
|
|
|
/* update the source pointer and index */
|
|
sourceIndex=nextSourceIndex+((const uint8_t *)pArgs->source-source);
|
|
source=(const uint8_t *)pArgs->source;
|
|
|
|
/* break on error */
|
|
if(U_FAILURE(*pErrorCode)) {
|
|
offset=0;
|
|
state=0;
|
|
byteIndex=0;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If the callback overflowed the target, then we need to
|
|
* stop here with an overflow indication.
|
|
*/
|
|
if(cnv->UCharErrorBufferLength>0) {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We do not need to repeat the statements from the normal
|
|
* end of the action codes because we already updated all the
|
|
* necessary variables.
|
|
*/
|
|
}
|
|
} else {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
}
|
|
endloop:
|
|
|
|
if(pArgs->flush && source>=sourceLimit) {
|
|
/* reset the state for the next conversion */
|
|
if(byteIndex>0 && U_SUCCESS(*pErrorCode)) {
|
|
/* a character byte sequence remains incomplete */
|
|
*pErrorCode=U_TRUNCATED_CHAR_FOUND;
|
|
}
|
|
cnv->toUnicodeStatus=0;
|
|
cnv->mode=0;
|
|
cnv->toULength=0;
|
|
} else {
|
|
/* set the converter state back into UConverter */
|
|
cnv->toUnicodeStatus=offset;
|
|
cnv->mode=state;
|
|
cnv->toULength=byteIndex;
|
|
}
|
|
|
|
/* write back the updated pointers */
|
|
pArgs->source=(const char *)source;
|
|
pArgs->target=target;
|
|
pArgs->offsets=offsets;
|
|
}
|
|
|
|
U_CFUNC void
|
|
_MBCSToUnicode(UConverterToUnicodeArgs *pArgs,
|
|
UErrorCode *pErrorCode) {
|
|
_MBCSToUnicodeWithOffsets(pArgs, pErrorCode);
|
|
}
|
|
|
|
/* This version of _MBCSToUnicode() is optimized for single-byte, single-state codepages. */
|
|
U_CFUNC void
|
|
_MBCSSingleToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs,
|
|
UErrorCode *pErrorCode) {
|
|
/* set up the local pointers */
|
|
UConverter *cnv;
|
|
const uint8_t *source, *sourceLimit;
|
|
UChar *target;
|
|
const UChar *targetLimit;
|
|
int32_t *offsets;
|
|
|
|
const int32_t (*stateTable)[256];
|
|
|
|
int32_t sourceIndex, nextSourceIndex;
|
|
|
|
int32_t entry;
|
|
UChar c;
|
|
uint8_t b;
|
|
UConverterCallbackReason reason;
|
|
|
|
/* set up the local pointers */
|
|
cnv=pArgs->converter;
|
|
source=(const uint8_t *)pArgs->source;
|
|
sourceLimit=(const uint8_t *)pArgs->sourceLimit;
|
|
target=pArgs->target;
|
|
targetLimit=pArgs->targetLimit;
|
|
offsets=pArgs->offsets;
|
|
|
|
stateTable=cnv->sharedData->table->mbcs.stateTable;
|
|
|
|
/* sourceIndex=-1 if the current character began in the previous buffer */
|
|
sourceIndex=0;
|
|
nextSourceIndex=0;
|
|
|
|
/* conversion loop */
|
|
while(source<sourceLimit) {
|
|
/*
|
|
* This following test is to see if available input would overflow the output.
|
|
* It does not catch output of more than one code unit that
|
|
* overflows as a result of a surrogate pair or callback output
|
|
* from the last source byte.
|
|
* Therefore, those situations also test for overflows and will
|
|
* then break the loop, too.
|
|
*/
|
|
if(target<targetLimit) {
|
|
b=*source++;
|
|
++nextSourceIndex;
|
|
entry=stateTable[0][b];
|
|
/* entry<0 */
|
|
/*
|
|
* bit 31 is set, bits:
|
|
* 30..27 action code
|
|
* (do not mask out bit 31 for speed, include it in action values)
|
|
* 26..7 depend on the action code
|
|
* 6..0 next state
|
|
*/
|
|
|
|
/* switch per action code */
|
|
switch((uint32_t)entry>>27U) {
|
|
case 16|MBCS_STATE_ILLEGAL:
|
|
/* bits 26..7 are not used, 0 */
|
|
/* callback(illegal) */
|
|
reason=UCNV_ILLEGAL;
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
goto callback;
|
|
case 16|MBCS_STATE_UNASSIGNED:
|
|
/* bits 26..7 are not used, 0 */
|
|
/* callback(unassigned) */
|
|
reason=UCNV_UNASSIGNED;
|
|
*pErrorCode=U_INVALID_CHAR_FOUND;
|
|
goto callback;
|
|
case 16|MBCS_STATE_FALLBACK_DIRECT_16:
|
|
/* bits 26..23 are not used, 0 */
|
|
/* bits 22..7 contain the Unicode BMP code point */
|
|
if(!UCNV_TO_U_USE_FALLBACK(cnv)) {
|
|
/* callback(unassigned) */
|
|
reason=UCNV_UNASSIGNED;
|
|
*pErrorCode=U_INVALID_CHAR_FOUND;
|
|
goto callback;
|
|
}
|
|
/* fall through to the MBCS_STATE_VALID_DIRECT_16 branch */
|
|
case 16|MBCS_STATE_VALID_DIRECT_16:
|
|
/* bits 26..23 are not used, 0 */
|
|
/* bits 22..7 contain the Unicode BMP code point */
|
|
/* output BMP code point */
|
|
*target++=(UChar)(entry>>7);
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
break;
|
|
case 16|MBCS_STATE_FALLBACK_DIRECT_20:
|
|
/* bits 26..7 contain the Unicode surrogate code point minus 0x10000 */
|
|
if(!UCNV_TO_U_USE_FALLBACK(cnv)) {
|
|
/* callback(unassigned) */
|
|
reason=UCNV_UNASSIGNED;
|
|
*pErrorCode=U_INVALID_CHAR_FOUND;
|
|
goto callback;
|
|
}
|
|
/* fall through to the MBCS_STATE_VALID_DIRECT_20 branch */
|
|
case 16|MBCS_STATE_VALID_DIRECT_20:
|
|
/* bits 26..7 contain the Unicode surrogate code point minus 0x10000 */
|
|
entry=(entry>>7)&0xfffff;
|
|
/* output surrogate pair */
|
|
*target++=(UChar)(0xd800|(UChar)(entry>>10));
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
c=(UChar)(0xdc00|(UChar)(entry&0x3ff));
|
|
if(target<targetLimit) {
|
|
*target++=c;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
} else {
|
|
/* target overflow */
|
|
cnv->UCharErrorBuffer[0]=c;
|
|
cnv->UCharErrorBufferLength=1;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
goto endloop;
|
|
}
|
|
break;
|
|
default:
|
|
/* reserved, must never occur */
|
|
/* bits 26..7 are not used, 0 */
|
|
break;
|
|
}
|
|
|
|
/* normal end of action codes: prepare for a new character */
|
|
sourceIndex=nextSourceIndex;
|
|
continue;
|
|
|
|
callback:
|
|
/* call the callback function with all the preparations and post-processing */
|
|
/* update the arguments structure */
|
|
pArgs->source=(const char *)source;
|
|
pArgs->target=target;
|
|
pArgs->offsets=offsets;
|
|
|
|
/* copy the current bytes to invalidCharBuffer */
|
|
cnv->invalidCharBuffer[0]=b;
|
|
cnv->invalidCharLength=1;
|
|
|
|
/* call the callback function */
|
|
toUCallback(cnv, cnv->toUContext, pArgs, (const char *)&b, 1, reason, pErrorCode);
|
|
|
|
/* update target and deal with offsets if necessary */
|
|
offsets=ucnv_updateCallbackOffsets(offsets, pArgs->target-target, sourceIndex);
|
|
target=pArgs->target;
|
|
|
|
/* update the source pointer and index */
|
|
sourceIndex=nextSourceIndex+((const uint8_t *)pArgs->source-source);
|
|
source=(const uint8_t *)pArgs->source;
|
|
|
|
/* break on error */
|
|
if(U_FAILURE(*pErrorCode)) {
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If the callback overflowed the target, then we need to
|
|
* stop here with an overflow indication.
|
|
*/
|
|
if(cnv->UCharErrorBufferLength>0) {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We do not need to repeat the statements from the normal
|
|
* end of the action codes because we already updated all the
|
|
* necessary variables.
|
|
*/
|
|
} else {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
}
|
|
endloop:
|
|
|
|
/* write back the updated pointers */
|
|
pArgs->source=(const char *)source;
|
|
pArgs->target=target;
|
|
pArgs->offsets=offsets;
|
|
}
|
|
|
|
/*
|
|
* This is a simple, interim implementation of GetNextUChar()
|
|
* that allows to concentrate on testing one single implementation
|
|
* of the ToUnicode conversion before it gets copied to
|
|
* multiple version that are then optimized for their needs
|
|
* (with vs. without offsets and getNextUChar).
|
|
* ### TODO: implement this directly similar to ToUnicode()
|
|
*/
|
|
U_CFUNC UChar32
|
|
_MBCSGetNextUChar(UConverterToUnicodeArgs *pArgs,
|
|
UErrorCode *pErrorCode) {
|
|
UChar buffer[UTF_MAX_CHAR_LENGTH];
|
|
const char *realLimit=pArgs->sourceLimit;
|
|
|
|
pArgs->target=buffer;
|
|
pArgs->targetLimit=buffer+UTF_MAX_CHAR_LENGTH;
|
|
|
|
while(pArgs->source<realLimit) {
|
|
/* feed in one byte at a time to make sure to get only one character out */
|
|
pArgs->sourceLimit=pArgs->source+1;
|
|
pArgs->flush= (UBool)(pArgs->sourceLimit==realLimit);
|
|
_MBCSToUnicode(pArgs, pErrorCode);
|
|
if(U_FAILURE(*pErrorCode) && *pErrorCode!=U_BUFFER_OVERFLOW_ERROR) {
|
|
return 0xffff;
|
|
} else {
|
|
int32_t length=pArgs->target-buffer;
|
|
#if 0
|
|
/*
|
|
* markus 2000-oct-26
|
|
*
|
|
* This version of the exit condition is commented out because of
|
|
* a clarification of the semantics of ucnv_getNextUChar() (see updated javadoc):
|
|
*
|
|
* Codepages that provide direct encodings of supplementary Unicode code points (U+10000 and up)
|
|
* should return single surrogates without combining them into pairs if single surrogates
|
|
* are encoded. This group of codepages includes UTF-8, UTF-32, and GB 18030.
|
|
*
|
|
* Codepages that provide direct encodings only of single surrogates
|
|
* must attempt to match pairs of them into supplementary code points.
|
|
* Single surrogates are returned only if they are not part of matched pairs.
|
|
* This group of codepages includes SCSU, LMBCS, and UTF-16.
|
|
*
|
|
* Currently, there is no MBCS codepage in the second group. SCSU, LMBCS, and UTF-16
|
|
* are implemented with separate code.
|
|
*
|
|
* Therefore, this feature is removed here.
|
|
* It might need to be added back in later when some MBCS codepages are created that
|
|
* fall into the second group. In this case, a flag in the .cnv file will be necessary
|
|
* to indicate this. makeconv would need to set this flag based on whether the codepage
|
|
* contains only mappings for single surrogates but
|
|
* not directly for any supplementary code points.
|
|
*/
|
|
if(/* some output and (source consumed or not a surrogate or a surrogate pair [UTF-16 specific]) */
|
|
length>0 &&
|
|
(pArgs->flush || !UTF_IS_FIRST_SURROGATE(buffer[0]) || length==2)
|
|
#endif
|
|
if(length>0) {
|
|
if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) {
|
|
*pErrorCode=U_ZERO_ERROR;
|
|
}
|
|
return ucnv_getUChar32KeepOverflow(pArgs->converter, buffer, length);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* no output because of empty input or only state changes and skipping callbacks */
|
|
*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
|
|
return 0xffff;
|
|
}
|
|
|
|
/*
|
|
* This is a simple version of getNextUChar() that is used
|
|
* by other converter implementations.
|
|
* It does not use state from the converter, nor error codes.
|
|
*
|
|
* Return value:
|
|
* U+fffe unassigned
|
|
* U+ffff illegal
|
|
* otherwise the Unicode code point
|
|
*/
|
|
U_CFUNC UChar32
|
|
_MBCSSimpleGetNextUChar(UConverterSharedData *sharedData,
|
|
const char **pSource, const char *sourceLimit,
|
|
UBool useFallback) {
|
|
const uint8_t *source;
|
|
|
|
const int32_t (*stateTable)[256];
|
|
const uint16_t *unicodeCodeUnits;
|
|
|
|
uint32_t offset;
|
|
uint8_t state;
|
|
|
|
int32_t entry;
|
|
|
|
/* set up the local pointers */
|
|
source=(const uint8_t *)*pSource;
|
|
if(source>=(const uint8_t *)sourceLimit) {
|
|
/* no input at all: "unassigned" */
|
|
return 0xfffe;
|
|
}
|
|
|
|
/* use optimized function if possible */
|
|
if(sharedData->table->mbcs.countStates==1) {
|
|
return _MBCSSingleSimpleGetNextUChar(sharedData, (uint8_t)(*(*pSource)++), useFallback);
|
|
}
|
|
|
|
stateTable=sharedData->table->mbcs.stateTable;
|
|
unicodeCodeUnits=sharedData->table->mbcs.unicodeCodeUnits;
|
|
|
|
/* converter state */
|
|
offset=0;
|
|
state=0;
|
|
|
|
/* conversion loop */
|
|
do {
|
|
entry=stateTable[state][*source++];
|
|
if(entry>=0) {
|
|
/*
|
|
* bit 31 is not set, bits:
|
|
* 30..7 offset delta
|
|
* 6..0 next state
|
|
*/
|
|
state=(uint8_t)(entry&0x7f);
|
|
offset+=entry>>7;
|
|
} else {
|
|
/*
|
|
* bit 31 is set, bits:
|
|
* 30..27 action code
|
|
* (do not mask out bit 31 for speed, include it in action values)
|
|
* 26..7 depend on the action code
|
|
* 6..0 next state
|
|
*/
|
|
|
|
*pSource=(const char *)source;
|
|
|
|
/* switch per action code */
|
|
switch((uint32_t)entry>>27U) {
|
|
case 16|MBCS_STATE_ILLEGAL:
|
|
/* bits 26..7 are not used, 0 */
|
|
return 0xffff;
|
|
case 16|MBCS_STATE_CHANGE_ONLY:
|
|
/* bits 26..7 are not used, 0 */
|
|
/*
|
|
* This serves as a state change without any output.
|
|
* It is useful for reading simple stateful encodings,
|
|
* for example using just Shift-In/Shift-Out codes.
|
|
* The 21 unused bits may later be used for more sophisticated
|
|
* state transitions.
|
|
*/
|
|
if(source==(const uint8_t *)sourceLimit) {
|
|
/* if there are only state changes, then return "unassigned" */
|
|
return 0xfffe;
|
|
}
|
|
break;
|
|
case 16|MBCS_STATE_UNASSIGNED:
|
|
/* bits 26..7 are not used, 0 */
|
|
return 0xfffe;
|
|
case 16|MBCS_STATE_FALLBACK_DIRECT_16:
|
|
/* bits 26..23 are not used, 0 */
|
|
/* bits 22..7 contain the Unicode BMP code point */
|
|
if(!TO_U_USE_FALLBACK(useFallback)) {
|
|
return 0xfffe;
|
|
}
|
|
/* fall through to the MBCS_STATE_VALID_DIRECT_16 branch */
|
|
case 16|MBCS_STATE_VALID_DIRECT_16:
|
|
/* bits 26..23 are not used, 0 */
|
|
/* bits 22..7 contain the Unicode BMP code point */
|
|
/* output BMP code point */
|
|
return (UChar)(entry>>7);
|
|
case 16|MBCS_STATE_FALLBACK_DIRECT_20:
|
|
/* bits 26..7 contain the Unicode surrogate code point minus 0x10000 */
|
|
if(!TO_U_USE_FALLBACK(useFallback)) {
|
|
return 0xfffe;
|
|
}
|
|
/* fall through to the MBCS_STATE_VALID_DIRECT_20 branch */
|
|
case 16|MBCS_STATE_VALID_DIRECT_20:
|
|
/* bits 26..7 contain the Unicode surrogate code point minus 0x10000 */
|
|
return 0x10000+((entry>>7)&0xfffff);
|
|
case 16|MBCS_STATE_VALID_16:
|
|
/* bits 26..16 are not used, 0 */
|
|
/* bits 15..7 contain the final offset delta to one 16-bit code unit */
|
|
offset+=(uint16_t)entry>>7;
|
|
entry=unicodeCodeUnits[offset];
|
|
if(entry!=0xfffe) {
|
|
return (UChar32)entry;
|
|
} else {
|
|
return _MBCSGetFallback(&sharedData->table->mbcs, offset);
|
|
}
|
|
case 16|MBCS_STATE_VALID_16_PAIR:
|
|
/* bits 26..16 are not used, 0 */
|
|
/* bits 15..7 contain the final offset delta to two 16-bit code units */
|
|
offset+=(uint16_t)entry>>7;
|
|
entry=unicodeCodeUnits[offset++];
|
|
if(UTF_IS_FIRST_SURROGATE(entry)) {
|
|
return UTF16_GET_PAIR_VALUE(entry, unicodeCodeUnits[offset]);
|
|
} else if(entry!=0xfffe) {
|
|
/* output BMP code point */
|
|
return (UChar32)entry;
|
|
} else {
|
|
/*
|
|
* For the fallback, we need to restore the offset that
|
|
* we had before the unicodeCodeUnits[offset++] above that incremented it!
|
|
*/
|
|
return _MBCSGetFallback(&sharedData->table->mbcs, offset-1);
|
|
}
|
|
default:
|
|
/* reserved, must never occur */
|
|
/* bits 26..7 are not used, 0 */
|
|
break;
|
|
}
|
|
|
|
/* state change only - prepare for a new character */
|
|
state=(uint8_t)(entry&0x7f); /* typically 0 */
|
|
offset=0;
|
|
}
|
|
} while(source<(const uint8_t *)sourceLimit);
|
|
|
|
*pSource=(const char *)source;
|
|
return 0xffff;
|
|
}
|
|
|
|
/* This version of _MBCSSimpleGetNextUChar() is optimized for single-byte, single-state codepages. */
|
|
U_CFUNC UChar32
|
|
_MBCSSingleSimpleGetNextUChar(UConverterSharedData *sharedData,
|
|
uint8_t b, UBool useFallback) {
|
|
int32_t entry;
|
|
|
|
entry=sharedData->table->mbcs.stateTable[0][b];
|
|
/* entry<0 */
|
|
/*
|
|
* bit 31 is set, bits:
|
|
* 30..27 action code
|
|
* (do not mask out bit 31 for speed, include it in action values)
|
|
* 26..7 depend on the action code
|
|
* 6..0 next state
|
|
*/
|
|
|
|
/* switch per action code */
|
|
switch((uint32_t)entry>>27U) {
|
|
case 16|MBCS_STATE_ILLEGAL:
|
|
/* bits 26..7 are not used, 0 */
|
|
return 0xffff;
|
|
case 16|MBCS_STATE_UNASSIGNED:
|
|
/* bits 26..7 are not used, 0 */
|
|
return 0xfffe;
|
|
case 16|MBCS_STATE_FALLBACK_DIRECT_16:
|
|
/* bits 26..23 are not used, 0 */
|
|
/* bits 22..7 contain the Unicode BMP code point */
|
|
if(!TO_U_USE_FALLBACK(useFallback)) {
|
|
return 0xfffe;
|
|
}
|
|
/* fall through to the MBCS_STATE_VALID_DIRECT_16 branch */
|
|
case 16|MBCS_STATE_VALID_DIRECT_16:
|
|
/* bits 26..23 are not used, 0 */
|
|
/* bits 22..7 contain the Unicode BMP code point */
|
|
/* output BMP code point */
|
|
return (UChar)(entry>>7);
|
|
case 16|MBCS_STATE_FALLBACK_DIRECT_20:
|
|
/* bits 26..7 contain the Unicode surrogate code point minus 0x10000 */
|
|
if(!TO_U_USE_FALLBACK(useFallback)) {
|
|
return 0xfffe;
|
|
}
|
|
/* fall through to the MBCS_STATE_VALID_DIRECT_20 branch */
|
|
case 16|MBCS_STATE_VALID_DIRECT_20:
|
|
/* bits 26..7 contain the Unicode surrogate code point minus 0x10000 */
|
|
return 0x10000+((entry>>7)&0xfffff);
|
|
default:
|
|
/* reserved, must never occur */
|
|
/* bits 26..7 are not used, 0 */
|
|
return 0xffff;
|
|
}
|
|
}
|
|
|
|
/* MBCS-from-Unicode conversion functions ----------------------------------- */
|
|
|
|
U_CFUNC void
|
|
_MBCSFromUnicodeWithOffsets(UConverterFromUnicodeArgs *pArgs,
|
|
UErrorCode *pErrorCode) {
|
|
UConverter *cnv;
|
|
const UChar *source, *sourceLimit;
|
|
uint8_t *target;
|
|
int32_t targetCapacity;
|
|
int32_t *offsets;
|
|
|
|
const uint16_t *table;
|
|
const uint8_t *bytes;
|
|
uint8_t outputType;
|
|
|
|
UChar32 c;
|
|
|
|
int32_t sourceIndex, nextSourceIndex;
|
|
|
|
UConverterCallbackReason reason;
|
|
uint32_t i;
|
|
uint32_t value;
|
|
int32_t length;
|
|
|
|
/* use optimized function if possible */
|
|
cnv=pArgs->converter;
|
|
outputType=cnv->sharedData->table->mbcs.outputType;
|
|
if(outputType==MBCS_OUTPUT_1) {
|
|
_MBCSSingleFromUnicodeWithOffsets(pArgs, pErrorCode);
|
|
return;
|
|
}
|
|
|
|
/* set up the local pointers */
|
|
source=pArgs->source;
|
|
sourceLimit=pArgs->sourceLimit;
|
|
target=(uint8_t *)pArgs->target;
|
|
targetCapacity=pArgs->targetLimit-pArgs->target;
|
|
offsets=pArgs->offsets;
|
|
|
|
table=cnv->sharedData->table->mbcs.fromUnicodeTable;
|
|
bytes=cnv->sharedData->table->mbcs.fromUnicodeBytes;
|
|
|
|
/* get the converter state from UConverter */
|
|
c=cnv->fromUSurrogateLead;
|
|
|
|
/* sourceIndex=-1 if the current character began in the previous buffer */
|
|
sourceIndex= c==0 ? 0 : -1;
|
|
nextSourceIndex=0;
|
|
|
|
/* conversion loop */
|
|
/*
|
|
* This is another piece of ugly code:
|
|
* A goto into the loop if the converter state contains a first surrogate
|
|
* from the previous function call.
|
|
* It saves me to check in each loop iteration a check of if(c==0)
|
|
* and duplicating the trail-surrogate-handling code in the else
|
|
* branch of that check.
|
|
* I could not find any other way to get around this other than
|
|
* using a function call for the conversion and callback, which would
|
|
* be even more inefficient.
|
|
*
|
|
* Markus Scherer 2000-jul-19
|
|
*/
|
|
if(c!=0 && targetCapacity>0) {
|
|
goto getTrail;
|
|
}
|
|
|
|
while(source<sourceLimit) {
|
|
/*
|
|
* This following test is to see if available input would overflow the output.
|
|
* It does not catch output of more than one byte that
|
|
* overflows as a result of a multi-byte character or callback output
|
|
* from the last source character.
|
|
* Therefore, those situations also test for overflows and will
|
|
* then break the loop, too.
|
|
*/
|
|
if(targetCapacity>0) {
|
|
/*
|
|
* Get a correct Unicode code point:
|
|
* a single UChar for a BMP code point or
|
|
* a matched surrogate pair for a "surrogate code point".
|
|
*/
|
|
c=*source++;
|
|
++nextSourceIndex;
|
|
if(UTF_IS_SURROGATE(c)) {
|
|
if(UTF_IS_SURROGATE_FIRST(c)) {
|
|
getTrail:
|
|
if(source<sourceLimit) {
|
|
/* test the following code unit */
|
|
UChar trail=*source;
|
|
if(UTF_IS_SECOND_SURROGATE(trail)) {
|
|
++source;
|
|
++nextSourceIndex;
|
|
c=UTF16_GET_PAIR_VALUE(c, trail);
|
|
/* convert this surrogate code point */
|
|
/* exit this condition tree */
|
|
} else {
|
|
/* this is an unmatched lead code unit (1st surrogate) */
|
|
/* callback(illegal) */
|
|
reason=UCNV_ILLEGAL;
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
goto callback;
|
|
}
|
|
} else {
|
|
/* no more input */
|
|
break;
|
|
}
|
|
} else {
|
|
/* this is an unmatched trail code unit (2nd surrogate) */
|
|
/* callback(illegal) */
|
|
reason=UCNV_ILLEGAL;
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
goto callback;
|
|
}
|
|
}
|
|
|
|
/* convert the Unicode code point in c into codepage bytes */
|
|
|
|
/*
|
|
* The basic lookup is a triple-stage compact array lookup:
|
|
*
|
|
* Bits 21..10 (0x440 different values because Unicode code points
|
|
* reach up to 0x10ffff) are used as an index into table[],
|
|
* then bits 9..4 are added to that and together multiplied by 2
|
|
* to be used as an index into a second table that starts at table+0x440.
|
|
*
|
|
* In that second table, there will be two 16-bit values
|
|
* (and therefore we multiplied by two in the previous step):
|
|
* One 16-bit value stores a bit for each of the 16 Unicode code points
|
|
* that are grouped here to indicate if it is assigned or not.
|
|
* If it is not assigned, there may still be a codepage character
|
|
* stored in the third stage: a fallback value. It is used only when
|
|
* fallbacks are turned on for the converter. If the code point is
|
|
* unassigned and fallbacks not used or there is no fallback character
|
|
* (all bytes 0), then the callback function is called.
|
|
*
|
|
* The second value in the second table (stage) is an index into
|
|
* the third table. It is multiplied by 16*(bytes stored per character)
|
|
* to get to the first of 16 characters. At last, bits 3..0 of
|
|
* the Unicode code point are multiplied by (bytes stored per character)
|
|
* and added to that index for the address of the output codepage
|
|
* character.
|
|
*
|
|
* For EUC encodings that use only either 0x8e or 0x8f as the first
|
|
* byte of their longest byte sequences, the first two bytes in
|
|
* this third stage indicate with their 7th bits whether these bytes
|
|
* are to be written directly or actually need to be preceeded by
|
|
* one of the two Single-Shift codes. With this, the third stage
|
|
* stores one byte fewer per character than the actual maximum length of
|
|
* EUC byte sequences.
|
|
*
|
|
* Other than that, leading zero bytes are removed and the other
|
|
* bytes output. A single zero byte may be output if the "assigned"
|
|
* bit in stage 2 was on or also if the Unicode code point is U+0000.
|
|
* The data structure does not support zero byte output as a fallback
|
|
* for other code points, and also does not allow output of leading zeros.
|
|
*/
|
|
i=0x440+2*((uint32_t)table[c>>10]+((c>>4)&0x3f));
|
|
|
|
/* is this code point assigned, or do we use fallbacks? */
|
|
if((table[i++]&(1<<(c&0xf)))!=0 || UCNV_FROM_U_USE_FALLBACK(cnv, c)) {
|
|
const uint8_t *p=bytes;
|
|
|
|
/* get the bytes and the length for the output */
|
|
switch(outputType) {
|
|
case MBCS_OUTPUT_1:
|
|
p+=(16*(uint32_t)table[i]+(c&0xf));
|
|
value=*p;
|
|
length=1;
|
|
break;
|
|
case MBCS_OUTPUT_2:
|
|
p+=(16*(uint32_t)table[i]+(c&0xf))*2;
|
|
# if U_IS_BIG_ENDIAN
|
|
value=*(uint16_t *)p;
|
|
# else
|
|
value=((uint32_t)*p<<8)|p[1];
|
|
# endif
|
|
if(value<=0xff) {
|
|
length=1;
|
|
} else {
|
|
length=2;
|
|
}
|
|
break;
|
|
case MBCS_OUTPUT_3:
|
|
p+=(16*(uint32_t)table[i]+(c&0xf))*3;
|
|
value=((uint32_t)*p<<16)|((uint32_t)p[1]<<8)|p[2];
|
|
if(value<=0xff) {
|
|
length=1;
|
|
} else if(value<=0xffff) {
|
|
length=2;
|
|
} else {
|
|
length=3;
|
|
}
|
|
break;
|
|
case MBCS_OUTPUT_4:
|
|
p+=(16*(uint32_t)table[i]+(c&0xf))*4;
|
|
# if U_IS_BIG_ENDIAN
|
|
value=*(uint32_t *)p;
|
|
# else
|
|
value=((uint32_t)*p<<24)|((uint32_t)p[1]<<16)|((uint32_t)p[2]<<8)|p[3];
|
|
# endif
|
|
if(value<=0xff) {
|
|
length=1;
|
|
} else if(value<=0xffff) {
|
|
length=2;
|
|
} else if(value<=0xffffff) {
|
|
length=3;
|
|
} else {
|
|
length=4;
|
|
}
|
|
break;
|
|
case MBCS_OUTPUT_3_EUC:
|
|
p+=(16*(uint32_t)table[i]+(c&0xf))*2;
|
|
# if U_IS_BIG_ENDIAN
|
|
value=*(uint16_t *)p;
|
|
# else
|
|
value=((uint32_t)*p<<8)|p[1];
|
|
# endif
|
|
/* EUC 16-bit fixed-length representation */
|
|
if(value<=0xff) {
|
|
length=1;
|
|
} else if((value&0x8000)==0) {
|
|
value|=0x8e8000;
|
|
length=3;
|
|
} else if((value&0x80)==0) {
|
|
value|=0x8f0080;
|
|
length=3;
|
|
} else {
|
|
length=2;
|
|
}
|
|
break;
|
|
case MBCS_OUTPUT_4_EUC:
|
|
p+=(16*(uint32_t)table[i]+(c&0xf))*3;
|
|
value=((uint32_t)*p<<16)|((uint32_t)p[1]<<8)|p[2];
|
|
/* EUC 16-bit fixed-length representation applied to the first two bytes */
|
|
if(value<=0xff) {
|
|
length=1;
|
|
} else if(value<=0xffff) {
|
|
length=2;
|
|
} else if((value&0x800000)==0) {
|
|
value|=0x8e800000;
|
|
length=4;
|
|
} else if((value&0x8000)==0) {
|
|
value|=0x8f008000;
|
|
length=4;
|
|
} else {
|
|
length=3;
|
|
}
|
|
break;
|
|
default:
|
|
/* must not occur */
|
|
/*
|
|
* To avoid compiler warnings that value & length may be
|
|
* used without having been initialized, we set them here.
|
|
* In reality, this is unreachable code.
|
|
* Not having a default branch also causes warnings with
|
|
* some compilers.
|
|
*/
|
|
value=0;
|
|
length=0;
|
|
break;
|
|
}
|
|
|
|
/* is the codepage value really an "unassigned" indicator? */
|
|
if(value==0 && c!=0 && (table[i-1]&(1<<(c&0xf)))==0) {
|
|
/*
|
|
* We allow a 0 byte output if the Unicode code point is
|
|
* U+0000 and also if the "assigned" bit is set for this entry.
|
|
* There is no way with this data structure for fallback output
|
|
* for other than U+0000 to be a zero byte.
|
|
*/
|
|
/* callback(unassigned) */
|
|
reason=UCNV_UNASSIGNED;
|
|
*pErrorCode=U_INVALID_CHAR_FOUND;
|
|
goto callback;
|
|
}
|
|
} else {
|
|
/* callback(unassigned) */
|
|
reason=UCNV_UNASSIGNED;
|
|
*pErrorCode=U_INVALID_CHAR_FOUND;
|
|
goto callback;
|
|
}
|
|
|
|
/* write the output character bytes from value and length */
|
|
/* from the first if in the loop we know that targetCapacity>0 */
|
|
if(length<=targetCapacity) {
|
|
if(offsets==NULL) {
|
|
switch(length) {
|
|
/* each branch falls through to the next one */
|
|
case 4:
|
|
*target++=(uint8_t)(value>>24);
|
|
case 3:
|
|
*target++=(uint8_t)(value>>16);
|
|
case 2:
|
|
*target++=(uint8_t)(value>>8);
|
|
case 1:
|
|
*target++=(uint8_t)value;
|
|
default:
|
|
/* will never occur */
|
|
break;
|
|
}
|
|
} else {
|
|
switch(length) {
|
|
/* each branch falls through to the next one */
|
|
case 4:
|
|
*target++=(uint8_t)(value>>24);
|
|
*offsets++=sourceIndex;
|
|
case 3:
|
|
*target++=(uint8_t)(value>>16);
|
|
*offsets++=sourceIndex;
|
|
case 2:
|
|
*target++=(uint8_t)(value>>8);
|
|
*offsets++=sourceIndex;
|
|
case 1:
|
|
*target++=(uint8_t)value;
|
|
*offsets++=sourceIndex;
|
|
default:
|
|
/* will never occur */
|
|
break;
|
|
}
|
|
}
|
|
targetCapacity-=length;
|
|
} else {
|
|
uint8_t *p;
|
|
|
|
/*
|
|
* We actually do this backwards here:
|
|
* In order to save an intermediate variable, we output
|
|
* first to the overflow buffer what does not fit into the
|
|
* regular target.
|
|
*/
|
|
/* we know that 1<=targetCapacity<length<=4 */
|
|
length-=targetCapacity;
|
|
p=(uint8_t *)cnv->charErrorBuffer;
|
|
switch(length) {
|
|
/* each branch falls through to the next one */
|
|
case 3:
|
|
*p++=(uint8_t)(value>>16);
|
|
case 2:
|
|
*p++=(uint8_t)(value>>8);
|
|
case 1:
|
|
*p=(uint8_t)value;
|
|
default:
|
|
/* will never occur */
|
|
break;
|
|
}
|
|
cnv->charErrorBufferLength=(int8_t)length;
|
|
|
|
/* now output what fits into the regular target */
|
|
value>>=8*length; /* length was reduced by targetCapacity */
|
|
switch(targetCapacity) {
|
|
/* each branch falls through to the next one */
|
|
case 3:
|
|
*target++=(uint8_t)(value>>16);
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
case 2:
|
|
*target++=(uint8_t)(value>>8);
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
case 1:
|
|
*target++=(uint8_t)value;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
default:
|
|
/* will never occur */
|
|
break;
|
|
}
|
|
|
|
/* target overflow */
|
|
targetCapacity=0;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
c=0;
|
|
break;
|
|
}
|
|
|
|
/* normal end of conversion: prepare for a new character */
|
|
c=0;
|
|
sourceIndex=nextSourceIndex;
|
|
continue;
|
|
|
|
/*
|
|
* This is the same ugly trick as in ToUnicode(), for the
|
|
* same reasons...
|
|
*/
|
|
callback:
|
|
/* call the callback function with all the preparations and post-processing */
|
|
/* update the arguments structure */
|
|
pArgs->source=source;
|
|
pArgs->target=(char *)target;
|
|
pArgs->offsets=offsets;
|
|
|
|
/* set the converter state in UConverter to deal with the next character */
|
|
cnv->fromUSurrogateLead=0;
|
|
|
|
/* write the code point as code units */
|
|
i=0;
|
|
UTF_APPEND_CHAR_UNSAFE(cnv->invalidUCharBuffer, i, c);
|
|
cnv->invalidUCharLength=(int8_t)i;
|
|
|
|
/* call the callback function */
|
|
fromUCallback(cnv, cnv->fromUContext, pArgs, cnv->invalidUCharBuffer, i, c, reason, pErrorCode);
|
|
|
|
/* get the converter state from UConverter */
|
|
c=cnv->fromUSurrogateLead;
|
|
|
|
/* update target and deal with offsets if necessary */
|
|
offsets=ucnv_updateCallbackOffsets(offsets, ((uint8_t *)pArgs->target)-target, sourceIndex);
|
|
target=(uint8_t *)pArgs->target;
|
|
|
|
/* update the source pointer and index */
|
|
sourceIndex=nextSourceIndex+(pArgs->source-source);
|
|
source=pArgs->source;
|
|
targetCapacity=(uint8_t *)pArgs->targetLimit-target;
|
|
|
|
/* break on error */
|
|
if(U_FAILURE(*pErrorCode)) {
|
|
c=0;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If the callback overflowed the target, then we need to
|
|
* stop here with an overflow indication.
|
|
*/
|
|
if(cnv->charErrorBufferLength>0) {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We do not need to repeat the statements from the normal
|
|
* end of the conversion because we already updated all the
|
|
* necessary variables.
|
|
*/
|
|
} else {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(pArgs->flush && source>=sourceLimit) {
|
|
/* reset the state for the next conversion */
|
|
if(c!=0 && U_SUCCESS(*pErrorCode)) {
|
|
/* a character byte sequence remains incomplete */
|
|
*pErrorCode=U_TRUNCATED_CHAR_FOUND;
|
|
}
|
|
cnv->fromUSurrogateLead=0;
|
|
} else {
|
|
/* set the converter state back into UConverter */
|
|
cnv->fromUSurrogateLead=(UChar)c;
|
|
}
|
|
|
|
/* write back the updated pointers */
|
|
pArgs->source=source;
|
|
pArgs->target=(char *)target;
|
|
pArgs->offsets=offsets;
|
|
}
|
|
|
|
U_CFUNC void
|
|
_MBCSFromUnicode(UConverterFromUnicodeArgs *pArgs,
|
|
UErrorCode *pErrorCode) {
|
|
_MBCSFromUnicodeWithOffsets(pArgs, pErrorCode);
|
|
}
|
|
|
|
/* This version of _MBCSFromUnicode() is optimized for single-byte codepages. */
|
|
U_CFUNC void
|
|
_MBCSSingleFromUnicodeWithOffsets(UConverterFromUnicodeArgs *pArgs,
|
|
UErrorCode *pErrorCode) {
|
|
UConverter *cnv;
|
|
const UChar *source, *sourceLimit;
|
|
uint8_t *target;
|
|
int32_t targetCapacity;
|
|
int32_t *offsets;
|
|
|
|
const uint16_t *table;
|
|
const uint8_t *bytes;
|
|
uint8_t outputType;
|
|
|
|
UChar32 c;
|
|
|
|
int32_t sourceIndex, nextSourceIndex;
|
|
|
|
UConverterCallbackReason reason;
|
|
uint32_t i;
|
|
uint32_t value;
|
|
|
|
/* set up the local pointers */
|
|
cnv=pArgs->converter;
|
|
source=pArgs->source;
|
|
sourceLimit=pArgs->sourceLimit;
|
|
target=(uint8_t *)pArgs->target;
|
|
targetCapacity=pArgs->targetLimit-pArgs->target;
|
|
offsets=pArgs->offsets;
|
|
|
|
table=cnv->sharedData->table->mbcs.fromUnicodeTable;
|
|
bytes=cnv->sharedData->table->mbcs.fromUnicodeBytes;
|
|
outputType=cnv->sharedData->table->mbcs.outputType;
|
|
|
|
/* get the converter state from UConverter */
|
|
c=cnv->fromUSurrogateLead;
|
|
|
|
/* sourceIndex=-1 if the current character began in the previous buffer */
|
|
sourceIndex= c==0 ? 0 : -1;
|
|
nextSourceIndex=0;
|
|
|
|
/* conversion loop */
|
|
if(c!=0 && targetCapacity>0) {
|
|
goto getTrail;
|
|
}
|
|
|
|
while(source<sourceLimit) {
|
|
/*
|
|
* This following test is to see if available input would overflow the output.
|
|
* It does not catch output of more than one byte that
|
|
* overflows as a result of a multi-byte character or callback output
|
|
* from the last source character.
|
|
* Therefore, those situations also test for overflows and will
|
|
* then break the loop, too.
|
|
*/
|
|
if(targetCapacity>0) {
|
|
/*
|
|
* Get a correct Unicode code point:
|
|
* a single UChar for a BMP code point or
|
|
* a matched surrogate pair for a "surrogate code point".
|
|
*/
|
|
c=*source++;
|
|
++nextSourceIndex;
|
|
if(UTF_IS_SURROGATE(c)) {
|
|
if(UTF_IS_SURROGATE_FIRST(c)) {
|
|
getTrail:
|
|
if(source<sourceLimit) {
|
|
/* test the following code unit */
|
|
UChar trail=*source;
|
|
if(UTF_IS_SECOND_SURROGATE(trail)) {
|
|
++source;
|
|
++nextSourceIndex;
|
|
c=UTF16_GET_PAIR_VALUE(c, trail);
|
|
/* convert this surrogate code point */
|
|
/* exit this condition tree */
|
|
} else {
|
|
/* this is an unmatched lead code unit (1st surrogate) */
|
|
/* callback(illegal) */
|
|
reason=UCNV_ILLEGAL;
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
goto callback;
|
|
}
|
|
} else {
|
|
/* no more input */
|
|
break;
|
|
}
|
|
} else {
|
|
/* this is an unmatched trail code unit (2nd surrogate) */
|
|
/* callback(illegal) */
|
|
reason=UCNV_ILLEGAL;
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
goto callback;
|
|
}
|
|
}
|
|
|
|
/* convert the Unicode code point in c into codepage bytes */
|
|
i=0x440+2*((uint32_t)table[c>>10]+((c>>4)&0x3f));
|
|
|
|
/* is this code point assigned, or do we use fallbacks? */
|
|
if((table[i++]&(1<<(c&0xf)))!=0 || UCNV_FROM_U_USE_FALLBACK(cnv, c)) {
|
|
const uint8_t *p=bytes;
|
|
|
|
/* MBCS_OUTPUT_1 */
|
|
p+=(16*(uint32_t)table[i]+(c&0xf));
|
|
value=*p;
|
|
|
|
/* is the codepage value really an "unassigned" indicator? */
|
|
if(value==0 && c!=0 && (table[i-1]&(1<<(c&0xf)))==0) {
|
|
/*
|
|
* We allow a 0 byte output if the Unicode code point is
|
|
* U+0000 and also if the "assigned" bit is set for this entry.
|
|
* There is no way with this data structure for fallback output
|
|
* for other than U+0000 to be a zero byte.
|
|
*/
|
|
/* callback(unassigned) */
|
|
reason=UCNV_UNASSIGNED;
|
|
*pErrorCode=U_INVALID_CHAR_FOUND;
|
|
goto callback;
|
|
}
|
|
} else {
|
|
/* callback(unassigned) */
|
|
reason=UCNV_UNASSIGNED;
|
|
*pErrorCode=U_INVALID_CHAR_FOUND;
|
|
goto callback;
|
|
}
|
|
|
|
/* write the output character bytes from value and length */
|
|
/* length==1 */
|
|
/* this is easy because we know that there is enough space */
|
|
*target++=(uint8_t)value;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
--targetCapacity;
|
|
|
|
/* normal end of conversion: prepare for a new character */
|
|
c=0;
|
|
sourceIndex=nextSourceIndex;
|
|
continue;
|
|
|
|
callback:
|
|
/* call the callback function with all the preparations and post-processing */
|
|
/* update the arguments structure */
|
|
pArgs->source=source;
|
|
pArgs->target=(char *)target;
|
|
pArgs->offsets=offsets;
|
|
|
|
/* set the converter state in UConverter to deal with the next character */
|
|
cnv->fromUSurrogateLead=0;
|
|
|
|
/* write the code point as code units */
|
|
i=0;
|
|
UTF_APPEND_CHAR_UNSAFE(cnv->invalidUCharBuffer, i, c);
|
|
cnv->invalidUCharLength=(int8_t)i;
|
|
|
|
/* call the callback function */
|
|
fromUCallback(cnv, cnv->fromUContext, pArgs, cnv->invalidUCharBuffer, i, c, reason, pErrorCode);
|
|
|
|
/* get the converter state from UConverter */
|
|
c=cnv->fromUSurrogateLead;
|
|
|
|
/* update target and deal with offsets if necessary */
|
|
offsets=ucnv_updateCallbackOffsets(offsets, ((uint8_t *)pArgs->target)-target, sourceIndex);
|
|
target=(uint8_t *)pArgs->target;
|
|
|
|
/* update the source pointer and index */
|
|
sourceIndex=nextSourceIndex+(pArgs->source-source);
|
|
source=pArgs->source;
|
|
targetCapacity=(uint8_t *)pArgs->targetLimit-target;
|
|
|
|
/* break on error */
|
|
if(U_FAILURE(*pErrorCode)) {
|
|
c=0;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If the callback overflowed the target, then we need to
|
|
* stop here with an overflow indication.
|
|
*/
|
|
if(cnv->charErrorBufferLength>0) {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We do not need to repeat the statements from the normal
|
|
* end of the conversion because we already updated all the
|
|
* necessary variables.
|
|
*/
|
|
} else {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(pArgs->flush && source>=sourceLimit) {
|
|
/* reset the state for the next conversion */
|
|
if(c!=0 && U_SUCCESS(*pErrorCode)) {
|
|
/* a character byte sequence remains incomplete */
|
|
*pErrorCode=U_TRUNCATED_CHAR_FOUND;
|
|
}
|
|
cnv->fromUSurrogateLead=0;
|
|
} else {
|
|
/* set the converter state back into UConverter */
|
|
cnv->fromUSurrogateLead=(UChar)c;
|
|
}
|
|
|
|
/* write back the updated pointers */
|
|
pArgs->source=source;
|
|
pArgs->target=(char *)target;
|
|
pArgs->offsets=offsets;
|
|
}
|
|
|
|
/*
|
|
* This is another simple conversion function for internal use by other
|
|
* conversion implementations.
|
|
* It does not use the converter state nor call callbacks.
|
|
* 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
|
|
_MBCSFromUChar32(UConverterSharedData *sharedData,
|
|
UChar32 c, uint32_t *pValue,
|
|
UBool useFallback) {
|
|
const uint16_t *table=sharedData->table->mbcs.fromUnicodeTable;
|
|
uint32_t i;
|
|
uint32_t value;
|
|
int32_t length;
|
|
|
|
/* convert the Unicode code point in c into codepage bytes (same as in _MBCSFromUnicodeWithOffsets) */
|
|
i=0x440+2*((uint32_t)table[c>>10]+((c>>4)&0x3f));
|
|
|
|
/* is this code point assigned, or do we use fallbacks? */
|
|
if((table[i++]&(1<<(c&0xf)))!=0 || FROM_U_USE_FALLBACK(useFallback, c)) {
|
|
const uint8_t *p=sharedData->table->mbcs.fromUnicodeBytes;
|
|
|
|
/* get the bytes and the length for the output */
|
|
switch(sharedData->table->mbcs.outputType) {
|
|
case MBCS_OUTPUT_1:
|
|
p+=(16*(uint32_t)table[i]+(c&0xf));
|
|
value=*p;
|
|
length=1;
|
|
break;
|
|
case MBCS_OUTPUT_2:
|
|
p+=(16*(uint32_t)table[i]+(c&0xf))*2;
|
|
# if U_IS_BIG_ENDIAN
|
|
value=*(uint16_t *)p;
|
|
# else
|
|
value=((uint32_t)*p<<8)|p[1];
|
|
# endif
|
|
if(value<=0xff) {
|
|
length=1;
|
|
} else {
|
|
length=2;
|
|
}
|
|
break;
|
|
case MBCS_OUTPUT_3:
|
|
p+=(16*(uint32_t)table[i]+(c&0xf))*3;
|
|
value=((uint32_t)*p<<16)|((uint32_t)p[1]<<8)|p[2];
|
|
if(value<=0xff) {
|
|
length=1;
|
|
} else if(value<=0xffff) {
|
|
length=2;
|
|
} else {
|
|
length=3;
|
|
}
|
|
break;
|
|
case MBCS_OUTPUT_4:
|
|
p+=(16*(uint32_t)table[i]+(c&0xf))*4;
|
|
# if U_IS_BIG_ENDIAN
|
|
value=*(uint32_t *)p;
|
|
# else
|
|
value=((uint32_t)*p<<24)|((uint32_t)p[1]<<16)|((uint32_t)p[2]<<8)|p[3];
|
|
# endif
|
|
if(value<=0xff) {
|
|
length=1;
|
|
} else if(value<=0xffff) {
|
|
length=2;
|
|
} else if(value<=0xffffff) {
|
|
length=3;
|
|
} else {
|
|
length=4;
|
|
}
|
|
break;
|
|
case MBCS_OUTPUT_3_EUC:
|
|
p+=(16*(uint32_t)table[i]+(c&0xf))*2;
|
|
# if U_IS_BIG_ENDIAN
|
|
value=*(uint16_t *)p;
|
|
# else
|
|
value=((uint32_t)*p<<8)|p[1];
|
|
# endif
|
|
/* EUC 16-bit fixed-length representation */
|
|
if(value<=0xff) {
|
|
length=1;
|
|
} else if((value&0x8000)==0) {
|
|
value|=0x8e8000;
|
|
length=3;
|
|
} else if((value&0x80)==0) {
|
|
value|=0x8f0080;
|
|
length=3;
|
|
} else {
|
|
length=2;
|
|
}
|
|
break;
|
|
case MBCS_OUTPUT_4_EUC:
|
|
p+=(16*(uint32_t)table[i]+(c&0xf))*3;
|
|
value=((uint32_t)*p<<16)|((uint32_t)p[1]<<8)|p[2];
|
|
/* EUC 16-bit fixed-length representation applied to the first two bytes */
|
|
if(value<=0xff) {
|
|
length=1;
|
|
} else if(value<=0xffff) {
|
|
length=2;
|
|
} else if((value&0x800000)==0) {
|
|
value|=0x8e800000;
|
|
length=4;
|
|
} else if((value&0x8000)==0) {
|
|
value|=0x8f008000;
|
|
length=4;
|
|
} else {
|
|
length=3;
|
|
}
|
|
break;
|
|
default:
|
|
/* must not occur */
|
|
return -1;
|
|
}
|
|
|
|
/* is the codepage value really an "unassigned" indicator? */
|
|
if(value==0 && c!=0 && (table[i-1]&(1<<(c&0xf)))==0) {
|
|
/*
|
|
* We allow a 0 byte output if the Unicode code point is
|
|
* U+0000 and also if the "assigned" bit is set for this entry.
|
|
* There is no way with this data structure for fallback output
|
|
* for other than U+0000 to be a zero byte.
|
|
*/
|
|
return 0;
|
|
} else {
|
|
*pValue=value;
|
|
return length;
|
|
}
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* miscellaneous ------------------------------------------------------------ */
|
|
|
|
static void
|
|
_MBCSGetStarters(const UConverter* cnv,
|
|
UBool starters[256],
|
|
UErrorCode *pErrorCode) {
|
|
const int32_t *state0=cnv->sharedData->table->mbcs.stateTable[0];
|
|
int i;
|
|
|
|
for(i=0; i<256; ++i) {
|
|
/* all bytes that cause a state transition from state 0 are lead bytes */
|
|
starters[i]= (UBool)(state0[i]>=0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is an internal function that allows other converter implementations
|
|
* to check whether a byte is a lead byte.
|
|
*/
|
|
U_CFUNC UBool
|
|
_MBCSIsLeadByte(UConverterSharedData *sharedData, char byte) {
|
|
return (UBool)(sharedData->table->mbcs.stateTable[0][(uint8_t)byte]>=0);
|
|
}
|
|
|
|
static const UConverterImpl _MBCSImpl={
|
|
UCNV_MBCS,
|
|
|
|
_MBCSLoad,
|
|
NULL,
|
|
|
|
_MBCSOpen,
|
|
NULL,
|
|
_MBCSReset,
|
|
|
|
_MBCSToUnicode,
|
|
_MBCSToUnicodeWithOffsets,
|
|
_MBCSFromUnicode,
|
|
_MBCSFromUnicodeWithOffsets,
|
|
_MBCSGetNextUChar,
|
|
|
|
_MBCSGetStarters
|
|
};
|
|
|
|
|
|
/* Static data is in tools/makeconv/ucnvstat.c for data-based
|
|
* converters. Be sure to update it as well.
|
|
*/
|
|
|
|
const UConverterSharedData _MBCSData={
|
|
sizeof(UConverterSharedData), 1,
|
|
NULL, NULL, NULL, FALSE, &_MBCSImpl,
|
|
0
|
|
};
|
|
|
|
/* GB 18030 special handling ------------------------------------------------ */
|
|
|
|
/* ### IMPORTANT: THIS IS ALPHA-VERSION SUPPORT CODE FOR GB 18030 AND MAY CHANGE WITHOUT NOTICE */
|
|
|
|
/* helper macros for linear values for GB 18030 four-byte sequences */
|
|
#define LINEAR_18030(a, b, c, d) ((((a)*10+(b))*126L+(c))*10L+(d))
|
|
|
|
#define LINEAR_18030_BASE LINEAR_18030(0x81, 0x30, 0x81, 0x30)
|
|
|
|
#define LINEAR(x) LINEAR_18030(x>>24, (x>>16)&0xff, (x>>8)&0xff, x&0xff)
|
|
|
|
/*
|
|
* Some ranges of GB 18030 where both the Unicode code points and the
|
|
* GB four-byte sequences are contiguous and are handled algorithmically by
|
|
* the special callback functions below.
|
|
* The values are start & end of Unicode & GB codes.
|
|
*/
|
|
static const uint32_t
|
|
gb18030Ranges[13][4]={
|
|
0x10000, 0x10ffff, LINEAR(0x90308130), LINEAR(0xe3329a35),
|
|
0x9fa6, 0xdfff, LINEAR(0x82358f34), LINEAR(0x83389837),
|
|
0x0452, 0x200f, LINEAR(0x8130d239), LINEAR(0x8136a530),
|
|
0xe865, 0xf92b, LINEAR(0x83389838), LINEAR(0x8431cc32),
|
|
0x2643, 0x2e80, LINEAR(0x8137a838), LINEAR(0x8138fd37),
|
|
0xfa2a, 0xfe2f, LINEAR(0x8431e336), LINEAR(0x8432cc35),
|
|
0x3ce1, 0x4055, LINEAR(0x8231d439), LINEAR(0x8232af33),
|
|
0x361b, 0x3917, LINEAR(0x8230a634), LINEAR(0x8230f238),
|
|
0x49b8, 0x4c76, LINEAR(0x8234a132), LINEAR(0x8234e734),
|
|
0x4160, 0x4336, LINEAR(0x8232c938), LINEAR(0x8232f838),
|
|
0x478e, 0x4946, LINEAR(0x8233e839), LINEAR(0x82349639),
|
|
0x44d7, 0x464b, LINEAR(0x8233a430), LINEAR(0x8233c932),
|
|
0xffe6, 0xffff, LINEAR(0x8432e932), LINEAR(0x8432eb37)
|
|
};
|
|
|
|
/* the callback functions handle GB 18030 specially */
|
|
static void
|
|
fromUCallback(UConverter *cnv,
|
|
void *context, UConverterFromUnicodeArgs *pArgs,
|
|
const UChar *codeUnits, int32_t length, UChar32 codePoint,
|
|
UConverterCallbackReason reason, UErrorCode *pErrorCode) {
|
|
if(cnv->extraInfo==gb18030Ranges && (reason==UCNV_UNASSIGNED || reason==UCNV_ILLEGAL)) {
|
|
const uint32_t *range;
|
|
int i;
|
|
|
|
range=gb18030Ranges[0];
|
|
for(i=0; i<sizeof(gb18030Ranges)/sizeof(gb18030Ranges[0]); range+=4, ++i) {
|
|
if(range[0]<=(uint32_t)codePoint && (uint32_t)codePoint<=range[1]) {
|
|
uint32_t linear;
|
|
char bytes[4];
|
|
|
|
/* found the Unicode code point, output the four-byte sequence for it */
|
|
*pErrorCode=U_ZERO_ERROR;
|
|
|
|
/* get the linear value of the first GB 18030 code in this range */
|
|
linear=range[2]-LINEAR_18030_BASE;
|
|
|
|
/* add the offset from the beginning of the range */
|
|
linear+=((uint32_t)codePoint-range[0]);
|
|
|
|
/* turn this into a four-byte sequence */
|
|
bytes[3]=(const char)(0x30+linear%10); linear/=10;
|
|
bytes[2]=(const char)(0x81+linear%126); linear/=126;
|
|
bytes[1]=(const char)(0x30+linear%10); linear/=10;
|
|
bytes[0]=(const char)(0x81+linear);
|
|
|
|
/* output this sequence */
|
|
ucnv_cbFromUWriteBytes(pArgs, bytes, 4, 0, pErrorCode);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* call the normal callback function */
|
|
cnv->fromUCharErrorBehaviour(context, pArgs, codeUnits, length, codePoint, reason, pErrorCode);
|
|
}
|
|
|
|
static void
|
|
toUCallback(UConverter *cnv,
|
|
void *context, UConverterToUnicodeArgs *pArgs,
|
|
const char *codeUnits, int32_t length,
|
|
UConverterCallbackReason reason, UErrorCode *pErrorCode) {
|
|
if(cnv->extraInfo==gb18030Ranges && reason==UCNV_UNASSIGNED && length==4) {
|
|
const uint32_t *range;
|
|
uint32_t linear;
|
|
int i;
|
|
|
|
linear=LINEAR_18030((uint8_t)codeUnits[0], (uint8_t)codeUnits[1], (uint8_t)codeUnits[2], (uint8_t)codeUnits[3]);
|
|
range=gb18030Ranges[0];
|
|
for(i=0; i<sizeof(gb18030Ranges)/sizeof(gb18030Ranges[0]); range+=4, ++i) {
|
|
if(range[2]<=linear && linear<=range[3]) {
|
|
UChar u[UTF_MAX_CHAR_LENGTH];
|
|
|
|
/* found the sequence, output the Unicode code point for it */
|
|
*pErrorCode=U_ZERO_ERROR;
|
|
|
|
/* add the linear difference between the input and start sequences to the start code point */
|
|
linear=range[0]+(linear-range[2]);
|
|
|
|
/* write the result as UChars and output */
|
|
i=0;
|
|
UTF_APPEND_CHAR_UNSAFE(u, i, linear);
|
|
ucnv_cbToUWriteUChars(pArgs, u, i, 0, pErrorCode);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* call the normal callback function */
|
|
cnv->fromCharErrorBehaviour(context, pArgs, codeUnits, length, reason, pErrorCode);
|
|
}
|