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scuffed-code/icu4c/source/common/ucnvmbcs.c
Markus Scherer 648a43a3d8 ICU-3361 fix SI/SO converter 
X-SVN-Rev: 14045
2003-12-09 01:12:20 +00:00

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/*
******************************************************************************
*
* Copyright (C) 2000-2003, International Business Machines
* Corporation and others. All Rights Reserved.
*
******************************************************************************
* file name: ucnvmbcs.c
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2000jul03
* created by: Markus W. Scherer
*
* The current code in this file replaces the previous implementation
* of conversion code from multi-byte codepages to Unicode and back.
* This implementation supports the following:
* - legacy variable-length codepages with up to 4 bytes per character
* - all Unicode code points (up to 0x10ffff)
* - efficient distinction of unassigned vs. illegal byte sequences
* - it is possible in fromUnicode() to directly deal with simple
* stateful encodings (used for EBCDIC_STATEFUL)
* - it is possible to convert Unicode code points
* to a single zero byte (but not as a fallback except for SBCS)
*
* Remaining limitations in fromUnicode:
* - byte sequences must not have leading zero bytes
* - except for SBCS codepages: no fallback mapping from Unicode to a zero byte
* - limitation to up to 4 bytes per character
*
* ICU 2.8 (late 2003) adds a secondary data structure which lifts some of these
* limitations and adds m:n character mappings and other features.
* See ucnv_ext.h for details.
*
* Change history:
*
* 5/6/2001 Ram Moved MBCS_SINGLE_RESULT_FROM_U,MBCS_STAGE_2_FROM_U,
* MBCS_VALUE_2_FROM_STAGE_2, MBCS_VALUE_4_FROM_STAGE_2
* macros to ucnvmbcs.h file
*/
#include "unicode/utypes.h"
#if !UCONFIG_NO_LEGACY_CONVERSION
#include "unicode/ucnv.h"
#include "unicode/ucnv_cb.h"
#include "unicode/udata.h"
#include "unicode/uset.h"
#include "ucnv_bld.h"
#include "ucnvmbcs.h"
#include "ucnv_ext.h"
#include "ucnv_cnv.h"
#include "umutex.h"
#include "cmemory.h"
#include "cstring.h"
/* control optimizations according to the platform */
#define MBCS_UNROLL_SINGLE_TO_BMP 1
#define MBCS_UNROLL_SINGLE_FROM_BMP 0
/*
* _MBCSHeader versions 4.2
* (Note that the _MBCSHeader version is in addition to the converter formatVersion.)
*
* Change from version 4.1:
* - Added an optional extension table structure at the end of the .cnv file.
* It is present if the upper bits of the header flags field contains a non-zero
* byte offset to it.
* Files that contain only a conversion table and no base table
* use the special outputType MBCS_OUTPUT_EXT_ONLY.
* These contain the base table name between the MBCS header and the extension
* data.
*
* Change from version 4.0:
* - Replace header.reserved with header.fromUBytesLength so that all
* fields in the data have length.
*
* Changes from version 3 (for performance improvements):
* - new bit distribution for state table entries
* - reordered action codes
* - new data structure for single-byte fromUnicode
* + stage 2 only contains indexes
* + stage 3 stores 16 bits per character with classification bits 15..8
* - no multiplier for stage 1 entries
* - stage 2 for non-single-byte codepages contains the index and the flags in
* one 32-bit value
* - 2-byte and 4-byte fromUnicode results are stored directly as 16/32-bit integers
*
* For more details about old versions of the MBCS data structure, see
* the corresponding versions of this file.
*
* Converting stateless codepage data ---------------------------------------***
* (or codepage data with simple states) to Unicode.
*
* Data structure and algorithm for converting from complex legacy codepages
* to Unicode. (Designed before 2000-may-22.)
*
* The basic idea is that the structure of legacy codepages can be described
* with state tables.
* When reading a byte stream, each input byte causes a state transition.
* Some transitions result in the output of a code point, some result in
* "unassigned" or "illegal" output.
* This is used here for character conversion.
*
* The data structure begins with a state table consisting of a row
* per state, with 256 entries (columns) per row for each possible input
* byte value.
* Each entry is 32 bits wide, with two formats distinguished by
* the sign bit (bit 31):
*
* One format for transitional entries (bit 31 not set) for non-final bytes, and
* one format for final entries (bit 31 set).
* Both formats contain the number of the next state in the same bit
* positions.
* State 0 is the initial state.
*
* Most of the time, the offset values of subsequent states are added
* up to a scalar value. This value will eventually be the index of
* the Unicode code point in a table that follows the state table.
* The effect is that the code points for final state table rows
* are contiguous. The code points of final state rows follow each other
* in the order of the references to those final states by previous
* states, etc.
*
* For some terminal states, the offset is itself the output Unicode
* code point (16 bits for a BMP code point or 20 bits for a supplementary
* code point (stored as code point minus 0x10000 so that 20 bits are enough).
* For others, the code point in the Unicode table is stored with either
* one or two code units: one for BMP code points, two for a pair of
* surrogates.
* All code points for a final state entry take up the same number of code
* units, regardless of whether they all actually _use_ the same number
* of code units. This is necessary for simple array access.
*
* An additional feature comes in with what in ICU is called "fallback"
* mappings:
*
* In addition to round-trippable, precise, 1:1 mappings, there are often
* mappings defined between similar, though not the same, characters.
* Typically, such mappings occur only in fromUnicode mapping tables because
* Unicode has a superset repertoire of most other codepages. However, it
* is possible to provide such mappings in the toUnicode tables, too.
* In this case, the fallback mappings are partly integrated into the
* general state tables because the structure of the encoding includes their
* byte sequences.
* For final entries in an initial state, fallback mappings are stored in
* the entry itself like with roundtrip mappings.
* For other final entries, they are stored in the code units table if
* the entry is for a pair of code units.
* For single-unit results in the code units table, there is no space to
* alternatively hold a fallback mapping; in this case, the code unit
* is stored as U+fffe (unassigned), and the fallback mapping needs to
* be looked up by the scalar offset value in a separate table.
*
* "Unassigned" state entries really mean "structurally unassigned",
* i.e., such a byte sequence will never have a mapping result.
*
* The interpretation of the bits in each entry is as follows:
*
* Bit 31 not set, not a terminal entry ("transitional"):
* 30..24 next state
* 23..0 offset delta, to be added up
*
* Bit 31 set, terminal ("final") entry:
* 30..24 next state (regardless of action code)
* 23..20 action code:
* action codes 0 and 1 result in precise-mapping Unicode code points
* 0 valid byte sequence
* 19..16 not used, 0
* 15..0 16-bit Unicode BMP code point
* never U+fffe or U+ffff
* 1 valid byte sequence
* 19..0 20-bit Unicode supplementary code point
* never U+fffe or U+ffff
*
* action codes 2 and 3 result in fallback (unidirectional-mapping) Unicode code points
* 2 valid byte sequence (fallback)
* 19..16 not used, 0
* 15..0 16-bit Unicode BMP code point as fallback result
* 3 valid byte sequence (fallback)
* 19..0 20-bit Unicode supplementary code point as fallback result
*
* action codes 4 and 5 may result in roundtrip/fallback/unassigned/illegal results
* depending on the code units they result in
* 4 valid byte sequence
* 19..9 not used, 0
* 8..0 final offset delta
* pointing to one 16-bit code unit which may be
* fffe unassigned -- look for a fallback for this offset
* ffff illegal
* 5 valid byte sequence
* 19..9 not used, 0
* 8..0 final offset delta
* pointing to two 16-bit code units
* (typically UTF-16 surrogates)
* the result depends on the first code unit as follows:
* 0000..d7ff roundtrip BMP code point (1st alone)
* d800..dbff roundtrip surrogate pair (1st, 2nd)
* dc00..dfff fallback surrogate pair (1st-400, 2nd)
* e000 roundtrip BMP code point (2nd alone)
* e001 fallback BMP code point (2nd alone)
* fffe unassigned
* ffff illegal
* (the final offset deltas are at most 255 * 2,
* times 2 because of storing code unit pairs)
*
* 6 unassigned byte sequence
* 19..16 not used, 0
* 15..0 16-bit Unicode BMP code point U+fffe (new with version 2)
* this does not contain a final offset delta because the main
* purpose of this action code is to save scalar offset values;
* therefore, fallback values cannot be assigned to byte
* sequences that result in this action code
* 7 illegal byte sequence
* 19..16 not used, 0
* 15..0 16-bit Unicode BMP code point U+ffff (new with version 2)
* 8 state change only
* 19..0 not used, 0
* useful for state changes in simple stateful encodings,
* at Shift-In/Shift-Out codes
*
*
* 9..15 reserved for future use
* current implementations will only perform a state change
* and ignore bits 19..0
*
* An encoding with contiguous ranges of unassigned byte sequences, like
* Shift-JIS and especially EUC-TW, can be stored efficiently by having
* at least two states for the trail bytes:
* One trail byte state that results in code points, and one that only
* has "unassigned" and "illegal" terminal states.
*
* Note: partly by accident, this data structure supports simple stateless
* encodings without any additional logic.
* Currently, only simple Shift-In/Shift-Out schemes are handled with
* appropriate state tables (especially EBCDIC_STATEFUL!).
*
* MBCS version 2 added:
* unassigned and illegal action codes have U+fffe and U+ffff
* instead of unused bits; this is useful for _MBCS_SINGLE_SIMPLE_GET_NEXT_BMP()
*
* Converting from Unicode to codepage bytes --------------------------------***
*
* The conversion data structure for fromUnicode is designed for the known
* structure of Unicode. It maps from 21-bit code points (0..0x10ffff) to
* a sequence of 1..4 bytes, in addition to a flag that indicates if there is
* a roundtrip mapping.
*
* The lookup is done with a 3-stage trie, using 11/6/4 bits for stage 1/2/3
* like in the character properties table.
* The beginning of the trie is at offsetFromUTable, the beginning of stage 3
* with the resulting bytes is at offsetFromUBytes.
*
* Beginning with version 4, single-byte codepages have a significantly different
* trie compared to other codepages.
* In all cases, the entry in stage 1 is directly the index of the block of
* 64 entries in stage 2.
*
* Single-byte lookup:
*
* Stage 2 only contains 16-bit indexes directly to the 16-blocks in stage 3.
* Stage 3 contains one 16-bit word per result:
* Bits 15..8 indicate the kind of result:
* f roundtrip result
* c fallback result from private-use code point
* 8 fallback result from other code points
* 0 unassigned
* Bits 7..0 contain the codepage byte. A zero byte is always possible.
*
* Multi-byte lookup:
*
* Stage 2 contains a 32-bit word for each 16-block in stage 3:
* Bits 31..16 contain flags for which stage 3 entries contain roundtrip results
* test: MBCS_FROM_U_IS_ROUNDTRIP(stage2Entry, c)
* If this test is false, then a non-zero result will be interpreted as
* a fallback mapping.
* Bits 15..0 contain the index to stage 3, which must be multiplied by 16*(bytes per char)
*
* Stage 3 contains 2, 3, or 4 bytes per result.
* 2 or 4 bytes are stored as uint16_t/uint32_t in platform endianness,
* while 3 bytes are stored as bytes in big-endian order.
* Leading zero bytes are ignored, and the number of bytes is counted.
* A zero byte mapping result is possible as a roundtrip result.
* For some output types, the actual result is processed from this;
* see _MBCSFromUnicodeWithOffsets().
*
* Note that stage 1 always contains 0x440=1088 entries (0x440==0x110000>>10),
* or (version 3 and up) for BMP-only codepages, it contains 64 entries.
*
* In version 3, stage 2 blocks may overlap by multiples of the multiplier
* for compaction.
* In version 4, stage 2 blocks (and for single-byte codepages, stage 3 blocks)
* may overlap by any number of entries.
*
* MBCS version 2 added:
* the converter checks for known output types, which allows
* adding new ones without crashing an unaware converter
*/
/* GB 18030 data ------------------------------------------------------------ */
/* 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.
*
* Note that single surrogates are not mapped by GB 18030
* as of the re-released mapping tables from 2000-nov-30.
*/
static const uint32_t
gb18030Ranges[13][4]={
{0x10000, 0x10FFFF, LINEAR(0x90308130), LINEAR(0xE3329A35)},
{0x9FA6, 0xD7FF, LINEAR(0x82358F33), LINEAR(0x8336C738)},
{0x0452, 0x200F, LINEAR(0x8130D330), LINEAR(0x8136A531)},
{0xE865, 0xF92B, LINEAR(0x8336D030), LINEAR(0x84308534)},
{0x2643, 0x2E80, LINEAR(0x8137A839), LINEAR(0x8138FD38)},
{0xFA2A, 0xFE2F, LINEAR(0x84309C38), LINEAR(0x84318537)},
{0x3CE1, 0x4055, LINEAR(0x8231D438), LINEAR(0x8232AF32)},
{0x361B, 0x3917, LINEAR(0x8230A633), LINEAR(0x8230F237)},
{0x49B8, 0x4C76, LINEAR(0x8234A131), LINEAR(0x8234E733)},
{0x4160, 0x4336, LINEAR(0x8232C937), LINEAR(0x8232F837)},
{0x478E, 0x4946, LINEAR(0x8233E838), LINEAR(0x82349638)},
{0x44D7, 0x464B, LINEAR(0x8233A339), LINEAR(0x8233C931)},
{0xFFE6, 0xFFFF, LINEAR(0x8431A234), LINEAR(0x8431A439)}
};
/* bit flag for UConverter.options indicating GB 18030 special handling */
#define _MBCS_OPTION_GB18030 0x8000
/* Miscellaneous ------------------------------------------------------------ */
static uint32_t
_MBCSSizeofFromUBytes(UConverterMBCSTable *mbcsTable) {
const uint16_t *table;
uint32_t st3, maxStage3;
uint16_t st1, maxStage1, st2;
if(mbcsTable->fromUBytesLength>0) {
/*
* We _know_ the number of bytes in the fromUnicodeBytes array
* starting with header.version 4.1.
* Otherwise, below, we need to enumerate the fromUnicode
* trie and find the highest entry.
*/
return mbcsTable->fromUBytesLength;
}
/* Enumerate the from-Unicode trie table to find the highest stage 3 index. */
table=mbcsTable->fromUnicodeTable;
maxStage3=0;
if(mbcsTable->unicodeMask&UCNV_HAS_SUPPLEMENTARY) {
maxStage1=0x440;
} else {
maxStage1=0x40;
}
if(mbcsTable->outputType==MBCS_OUTPUT_1) {
const uint16_t *stage2;
for(st1=0; st1<maxStage1; ++st1) {
st2=table[st1];
if(st2>maxStage1) {
stage2=table+st2;
for(st2=0; st2<64; ++st2) {
st3=stage2[st2];
if(st3>maxStage3) {
maxStage3=st3;
}
}
}
}
/*
* add 16 to get the limit not start index of the last stage 3 block,
* times 2 for number of bytes
*/
return (maxStage3+16)*2;
} else {
const uint32_t *stage2;
for(st1=0; st1<maxStage1; ++st1) {
st2=table[st1];
if(st2>(maxStage1>>1)) {
stage2=(const uint32_t *)table+st2;
for(st2=0; st2<64; ++st2) {
st3=stage2[st2]&0xffff;
if(st3>maxStage3) {
maxStage3=st3;
}
}
}
}
/*
* add 16 to get the limit not start index of the last stage 3 block,
* times 2..4 for number of bytes
*/
maxStage3=16*maxStage3+16;
switch(mbcsTable->outputType) {
case MBCS_OUTPUT_3:
case MBCS_OUTPUT_4_EUC:
maxStage3*=3;
break;
case MBCS_OUTPUT_4:
maxStage3*=4;
break;
default:
/* MBCS_OUTPUT_2... and MBCS_OUTPUT_3_EUC */
maxStage3*=2;
break;
}
return maxStage3;
}
}
/* similar to _MBCSGetNextUChar() but recursive */
static void
_getUnicodeSetForBytes(const UConverter *cnv,
const int32_t (*stateTable)[256], const uint16_t *unicodeCodeUnits,
USet *set,
UConverterUnicodeSet which,
uint8_t state, uint32_t offset, int32_t lowByte, int32_t highByte,
UErrorCode *pErrorCode) {
int32_t b, entry;
for(b=lowByte; b<=highByte; ++b) {
entry=stateTable[state][b];
if(MBCS_ENTRY_IS_TRANSITION(entry)) {
_getUnicodeSetForBytes(
cnv, stateTable, unicodeCodeUnits,
set, which,
(uint8_t)MBCS_ENTRY_TRANSITION_STATE(entry),
offset+MBCS_ENTRY_TRANSITION_OFFSET(entry),
0, 0xff,
pErrorCode);
} else {
UChar32 c;
int32_t rowOffset=offset;
uint8_t action;
c=U_SENTINEL;
/*
* An if-else-if chain provides more reliable performance for
* the most common cases compared to a switch.
*/
action=(uint8_t)(MBCS_ENTRY_FINAL_ACTION(entry));
if(action==MBCS_STATE_VALID_DIRECT_16) {
/* output BMP code point */
c=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
} else if(action==MBCS_STATE_VALID_16) {
offset+=MBCS_ENTRY_FINAL_VALUE_16(entry);
c=unicodeCodeUnits[offset];
if(c<0xfffe) {
/* output BMP code point */
} else {
c=U_SENTINEL;
}
} else if(action==MBCS_STATE_VALID_16_PAIR) {
offset+=MBCS_ENTRY_FINAL_VALUE_16(entry);
c=unicodeCodeUnits[offset++];
if(c<0xd800) {
/* output BMP code point below 0xd800 */
} else if(c<=0xdbff) {
/* output roundtrip or fallback supplementary code point */
c=((c&0x3ff)<<10)+unicodeCodeUnits[offset]+(0x10000-0xdc00);
} else if(c==0xe000) {
/* output roundtrip BMP code point above 0xd800 or fallback BMP code point */
c=unicodeCodeUnits[offset];
} else {
c=U_SENTINEL;
}
} else if(action==MBCS_STATE_VALID_DIRECT_20) {
/* output supplementary code point */
c=(UChar32)(MBCS_ENTRY_FINAL_VALUE(entry)+0x10000);
}
if(c>=0) {
uset_add(set, c);
}
offset=rowOffset;
}
}
}
/*
* Internal function returning a UnicodeSet for toUnicode() conversion.
* Currently only used for ISO-2022-CN, and only handles roundtrip mappings.
* In the future, if we add support for reverse-fallback sets, this function
* needs to be updated, and called for each initial state.
* Does not currently handle extensions.
* Does not empty the set first.
*/
U_CFUNC void
_MBCSGetUnicodeSetForBytes(const UConverter *cnv,
USet *set,
UConverterUnicodeSet which,
uint8_t state, int32_t lowByte, int32_t highByte,
UErrorCode *pErrorCode) {
_getUnicodeSetForBytes(
cnv, cnv->sharedData->mbcs.stateTable, cnv->sharedData->mbcs.unicodeCodeUnits,
set, which,
state, 0, lowByte, highByte,
pErrorCode);
}
static void
_MBCSGetUnicodeSet(const UConverter *cnv,
USet *set,
UConverterUnicodeSet which,
UErrorCode *pErrorCode) {
UConverterMBCSTable *mbcsTable;
const uint16_t *table;
uint32_t st3;
uint16_t st1, maxStage1, st2;
UChar32 c;
if(cnv->options&_MBCS_OPTION_GB18030) {
uset_addRange(set, 0, 0xd7ff);
uset_addRange(set, 0xe000, 0x10ffff);
return;
}
/* enumerate the from-Unicode trie table */
mbcsTable=&cnv->sharedData->mbcs;
table=mbcsTable->fromUnicodeTable;
if(mbcsTable->unicodeMask&UCNV_HAS_SUPPLEMENTARY) {
maxStage1=0x440;
} else {
maxStage1=0x40;
}
c=0; /* keep track of the current code point while enumerating */
if(mbcsTable->outputType==MBCS_OUTPUT_1) {
const uint16_t *stage2, *stage3, *results;
results=(const uint16_t *)mbcsTable->fromUnicodeBytes;
for(st1=0; st1<maxStage1; ++st1) {
st2=table[st1];
if(st2>maxStage1) {
stage2=table+st2;
for(st2=0; st2<64; ++st2) {
if((st3=stage2[st2])!=0) {
/* read the stage 3 block */
stage3=results+st3;
/*
* Add code points for which the roundtrip flag is set.
* Once we get a set for fallback mappings, we have to use
* a threshold variable with a value of 0x800.
* See _MBCSSingleFromBMPWithOffsets() and
* MBCS_SINGLE_RESULT_FROM_U() for details.
*/
do {
if(*stage3++>=0xf00) {
uset_add(set, c);
}
} while((++c&0xf)!=0);
} else {
c+=16; /* empty stage 3 block */
}
}
} else {
c+=1024; /* empty stage 2 block */
}
}
} else if(mbcsTable->outputType==MBCS_OUTPUT_DBCS_ONLY) {
/* ignore single-byte results */
const uint32_t *stage2;
const uint16_t *stage3, *results;
results=(const uint16_t *)mbcsTable->fromUnicodeBytes;
for(st1=0; st1<maxStage1; ++st1) {
st2=table[st1];
if(st2>(maxStage1>>1)) {
stage2=(const uint32_t *)table+st2;
for(st2=0; st2<64; ++st2) {
if((st3=stage2[st2])!=0) {
/* read the stage 3 block */
stage3=results+16*(uint32_t)(uint16_t)st3;
/* get the roundtrip flags for the stage 3 block */
st3>>=16;
/*
* Add code points for which the roundtrip flag is set.
* Once we get a set for fallback mappings, we have to check
* non-roundtrip stage 3 results for whether they are 0.
* See _MBCSFromUnicodeWithOffsets() for details.
*
* Ignore single-byte results (<0x100).
*/
do {
if((st3&1)!=0 && *stage3>=0x100) {
uset_add(set, c);
}
st3>>=1;
++stage3;
} while((++c&0xf)!=0);
} else {
c+=16; /* empty stage 3 block */
}
}
} else {
c+=1024; /* empty stage 2 block */
}
}
} else {
const uint32_t *stage2;
for(st1=0; st1<maxStage1; ++st1) {
st2=table[st1];
if(st2>(maxStage1>>1)) {
stage2=(const uint32_t *)table+st2;
for(st2=0; st2<64; ++st2) {
if((st3=stage2[st2])!=0) {
/* get the roundtrip flags for the stage 3 block */
st3>>=16;
/*
* Add code points for which the roundtrip flag is set.
* Once we get a set for fallback mappings, we have to check
* non-roundtrip stage 3 results for whether they are 0.
* See _MBCSFromUnicodeWithOffsets() for details.
*/
do {
if(st3&1) {
uset_add(set, c);
}
st3>>=1;
} while((++c&0xf)!=0);
} else {
c+=16; /* empty stage 3 block */
}
}
} else {
c+=1024; /* empty stage 2 block */
}
}
}
ucnv_extGetUnicodeSet(cnv, set, which, pErrorCode);
}
/* conversion extensions for input not in the main table -------------------- */
/*
* Hardcoded extension handling for GB 18030.
* Definition of LINEAR macros and gb18030Ranges see near the beginning of the file.
*
* In the future, conversion extensions may handle m:n mappings and delta tables,
* see http://oss.software.ibm.com/cvs/icu/~checkout~/icuhtml/design/conversion/conversion_extensions.html
*
* If an input character cannot be mapped, then these functions set an error
* code. The framework will then call the callback function.
*/
/*
* @return if(U_FAILURE) return the code point for cnv->fromUChar32
* else return 0 after output has been written to the target
*/
static UChar32
_extFromU(UConverter *cnv, const UConverterSharedData *sharedData,
UChar32 cp,
const UChar **source, const UChar *sourceLimit,
char **target, const char *targetLimit,
int32_t **offsets, int32_t sourceIndex,
UBool flush,
UErrorCode *pErrorCode) {
const int32_t *cx;
cnv->useSubChar1=FALSE;
if( (cx=sharedData->mbcs.extIndexes)!=NULL &&
ucnv_extInitialMatchFromU(
cnv, cx,
cp, source, sourceLimit,
target, targetLimit,
offsets, sourceIndex,
flush,
pErrorCode)
) {
return 0; /* an extension mapping handled the input */
}
/* GB 18030 */
if((cnv->options&_MBCS_OPTION_GB18030)!=0) {
const uint32_t *range;
int32_t i;
range=gb18030Ranges[0];
for(i=0; i<sizeof(gb18030Ranges)/sizeof(gb18030Ranges[0]); range+=4, ++i) {
if(range[0]<=(uint32_t)cp && (uint32_t)cp<=range[1]) {
/* found the Unicode code point, output the four-byte sequence for it */
uint32_t linear;
char bytes[4];
/* 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)cp-range[0]);
/* turn this into a four-byte sequence */
bytes[3]=(char)(0x30+linear%10); linear/=10;
bytes[2]=(char)(0x81+linear%126); linear/=126;
bytes[1]=(char)(0x30+linear%10); linear/=10;
bytes[0]=(char)(0x81+linear);
/* output this sequence */
ucnv_fromUWriteBytes(cnv,
bytes, 4, target, targetLimit,
offsets, sourceIndex, pErrorCode);
return 0;
}
}
}
/* no mapping */
*pErrorCode=U_INVALID_CHAR_FOUND;
return cp;
}
/*
* Input sequence: cnv->toUBytes[0..length[
* @return if(U_FAILURE) return the length (toULength, byteIndex) for the input
* else return 0 after output has been written to the target
*/
static int8_t
_extToU(UConverter *cnv, const UConverterSharedData *sharedData,
int8_t length,
const char **source, const char *sourceLimit,
UChar **target, const UChar *targetLimit,
int32_t **offsets, int32_t sourceIndex,
UBool flush,
UErrorCode *pErrorCode) {
const int32_t *cx;
if( (cx=sharedData->mbcs.extIndexes)!=NULL &&
ucnv_extInitialMatchToU(
cnv, cx,
length, source, sourceLimit,
target, targetLimit,
offsets, sourceIndex,
flush,
pErrorCode)
) {
return 0; /* an extension mapping handled the input */
}
/* GB 18030 */
if(length==4 && (cnv->options&_MBCS_OPTION_GB18030)!=0) {
const uint32_t *range;
uint32_t linear;
int32_t i;
linear=LINEAR_18030(cnv->toUBytes[0], cnv->toUBytes[1], cnv->toUBytes[2], cnv->toUBytes[3]);
range=gb18030Ranges[0];
for(i=0; i<sizeof(gb18030Ranges)/sizeof(gb18030Ranges[0]); range+=4, ++i) {
if(range[2]<=linear && linear<=range[3]) {
/* 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]);
/* output this code point */
ucnv_toUWriteCodePoint(cnv, linear, target, targetLimit, offsets, sourceIndex, pErrorCode);
return 0;
}
}
}
/* no mapping */
*pErrorCode=U_INVALID_CHAR_FOUND;
return length;
}
/* EBCDIC swap LF<->NL ------------------------------------------------------ */
/*
* This code modifies a standard EBCDIC<->Unicode mapping table for
* OS/390 (z/OS) Unix System Services (Open Edition).
* The difference is in the mapping of Line Feed and New Line control codes:
* Standard EBCDIC maps
*
* <U000A> \x25 |0
* <U0085> \x15 |0
*
* but OS/390 USS EBCDIC swaps the control codes for LF and NL,
* mapping
*
* <U000A> \x15 |0
* <U0085> \x25 |0
*
* This code modifies a loaded standard EBCDIC<->Unicode mapping table
* by copying it into allocated memory and swapping the LF and NL values.
* It allows to support the same EBCDIC charset in both versions without
* duplicating the entire installed table.
*/
/* standard EBCDIC codes */
#define EBCDIC_LF 0x25
#define EBCDIC_NL 0x15
/* standard EBCDIC codes with roundtrip flag as stored in Unicode-to-single-byte tables */
#define EBCDIC_RT_LF 0xf25
#define EBCDIC_RT_NL 0xf15
/* Unicode code points */
#define U_LF 0x0a
#define U_NL 0x85
static UBool
_EBCDICSwapLFNL(UConverterSharedData *sharedData, UErrorCode *pErrorCode) {
UConverterMBCSTable *mbcsTable;
const uint16_t *table, *results;
const uint8_t *bytes;
int32_t (*newStateTable)[256];
uint16_t *newResults;
uint8_t *p;
char *name;
uint32_t stage2Entry;
uint32_t size, sizeofFromUBytes;
mbcsTable=&sharedData->mbcs;
table=mbcsTable->fromUnicodeTable;
bytes=mbcsTable->fromUnicodeBytes;
results=(const uint16_t *)bytes;
/*
* Check that this is an EBCDIC table with SBCS portion -
* SBCS or EBCDIC_STATEFUL with standard EBCDIC LF and NL mappings.
*
* If not, ignore the option. Options are always ignored if they do not apply.
*/
if(!(
(mbcsTable->outputType==MBCS_OUTPUT_1 || mbcsTable->outputType==MBCS_OUTPUT_2_SISO) &&
mbcsTable->stateTable[0][EBCDIC_LF]==MBCS_ENTRY_FINAL(0, MBCS_STATE_VALID_DIRECT_16, U_LF) &&
mbcsTable->stateTable[0][EBCDIC_NL]==MBCS_ENTRY_FINAL(0, MBCS_STATE_VALID_DIRECT_16, U_NL)
)) {
return FALSE;
}
if(mbcsTable->outputType==MBCS_OUTPUT_1) {
if(!(
EBCDIC_RT_LF==MBCS_SINGLE_RESULT_FROM_U(table, results, U_LF) &&
EBCDIC_RT_NL==MBCS_SINGLE_RESULT_FROM_U(table, results, U_NL)
)) {
return FALSE;
}
} else /* MBCS_OUTPUT_2_SISO */ {
stage2Entry=MBCS_STAGE_2_FROM_U(table, U_LF);
if(!(
MBCS_FROM_U_IS_ROUNDTRIP(stage2Entry, U_LF)!=0 &&
EBCDIC_LF==MBCS_VALUE_2_FROM_STAGE_2(bytes, stage2Entry, U_LF)
)) {
return FALSE;
}
stage2Entry=MBCS_STAGE_2_FROM_U(table, U_NL);
if(!(
MBCS_FROM_U_IS_ROUNDTRIP(stage2Entry, U_NL)!=0 &&
EBCDIC_NL==MBCS_VALUE_2_FROM_STAGE_2(bytes, stage2Entry, U_NL)
)) {
return FALSE;
}
}
/*
* The table has an appropriate format.
* Allocate and build
* - a modified to-Unicode state table
* - a modified from-Unicode output array
* - a converter name string with the swap option appended
*/
sizeofFromUBytes=_MBCSSizeofFromUBytes(mbcsTable);
size=
mbcsTable->countStates*1024+
sizeofFromUBytes+
UCNV_MAX_CONVERTER_NAME_LENGTH+20;
p=(uint8_t *)uprv_malloc(size);
if(p==NULL) {
*pErrorCode=U_MEMORY_ALLOCATION_ERROR;
return FALSE;
}
/* copy and modify the to-Unicode state table */
newStateTable=(int32_t (*)[256])p;
uprv_memcpy(newStateTable, mbcsTable->stateTable, mbcsTable->countStates*1024);
newStateTable[0][EBCDIC_LF]=MBCS_ENTRY_FINAL(0, MBCS_STATE_VALID_DIRECT_16, U_NL);
newStateTable[0][EBCDIC_NL]=MBCS_ENTRY_FINAL(0, MBCS_STATE_VALID_DIRECT_16, U_LF);
/* copy and modify the from-Unicode result table */
newResults=(uint16_t *)newStateTable[mbcsTable->countStates];
uprv_memcpy(newResults, bytes, sizeofFromUBytes);
/* conveniently, the table access macros work on the left side of expressions */
if(mbcsTable->outputType==MBCS_OUTPUT_1) {
MBCS_SINGLE_RESULT_FROM_U(table, newResults, U_LF)=EBCDIC_RT_NL;
MBCS_SINGLE_RESULT_FROM_U(table, newResults, U_NL)=EBCDIC_RT_LF;
} else /* MBCS_OUTPUT_2_SISO */ {
stage2Entry=MBCS_STAGE_2_FROM_U(table, U_LF);
MBCS_VALUE_2_FROM_STAGE_2(newResults, stage2Entry, U_LF)=EBCDIC_NL;
stage2Entry=MBCS_STAGE_2_FROM_U(table, U_NL);
MBCS_VALUE_2_FROM_STAGE_2(newResults, stage2Entry, U_NL)=EBCDIC_LF;
}
/* set the canonical converter name */
name=(char *)newResults+sizeofFromUBytes;
uprv_strcpy(name, sharedData->staticData->name);
uprv_strcat(name, UCNV_SWAP_LFNL_OPTION_STRING);
/* set the pointers */
umtx_lock(NULL);
if(mbcsTable->swapLFNLStateTable==NULL) {
mbcsTable->swapLFNLStateTable=newStateTable;
mbcsTable->swapLFNLFromUnicodeBytes=(uint8_t *)newResults;
mbcsTable->swapLFNLName=name;
newStateTable=NULL;
}
umtx_unlock(NULL);
/* release the allocated memory if another thread beat us to it */
if(newStateTable!=NULL) {
uprv_free(newStateTable);
}
return TRUE;
}
/* MBCS setup functions ----------------------------------------------------- */
static void
_MBCSLoad(UConverterSharedData *sharedData,
UConverterLoadArgs *pArgs,
const uint8_t *raw,
UErrorCode *pErrorCode) {
UDataInfo info;
UConverterMBCSTable *mbcsTable=&sharedData->mbcs;
_MBCSHeader *header=(_MBCSHeader *)raw;
uint32_t offset;
if(header->version[0]!=4) {
*pErrorCode=U_INVALID_TABLE_FORMAT;
return;
}
mbcsTable->outputType=(uint8_t)header->flags;
/* extension data, header version 4.2 and higher */
offset=header->flags>>8;
if(offset!=0) {
mbcsTable->extIndexes=(const int32_t *)(raw+offset);
}
if(mbcsTable->outputType==MBCS_OUTPUT_EXT_ONLY) {
UConverterLoadArgs args={ 0 };
UConverterSharedData *baseSharedData;
const int32_t *extIndexes;
const char *baseName;
/* extension-only file, load the base table and set values appropriately */
if((extIndexes=mbcsTable->extIndexes)==NULL) {
/* extension-only file without extension */
*pErrorCode=U_INVALID_TABLE_FORMAT;
return;
}
if(pArgs->nestedLoads!=1) {
/* an extension table must not be loaded as a base table */
*pErrorCode=U_INVALID_TABLE_FILE;
return;
}
/* load the base table */
baseName=(const char *)(header+1);
if(0==uprv_strcmp(baseName, sharedData->staticData->name)) {
/* forbid loading this same extension-only file */
*pErrorCode=U_INVALID_TABLE_FORMAT;
return;
}
/* TODO parse package name out of the prefix of the base name in the extension .cnv file? */
args.size=sizeof(UConverterLoadArgs);
args.nestedLoads=2;
args.reserved=pArgs->reserved;
args.options=pArgs->options;
args.pkg=pArgs->pkg;
args.name=baseName;
baseSharedData=ucnv_load(&args, pErrorCode);
if(U_FAILURE(*pErrorCode)) {
return;
}
if( baseSharedData->staticData->conversionType!=UCNV_MBCS ||
baseSharedData->mbcs.baseSharedData!=NULL
) {
ucnv_unload(baseSharedData);
*pErrorCode=U_INVALID_TABLE_FORMAT;
return;
}
/* copy the base table data */
uprv_memcpy(mbcsTable, &baseSharedData->mbcs, sizeof(UConverterMBCSTable));
/* overwrite values with relevant ones for the extension converter */
mbcsTable->baseSharedData=baseSharedData;
mbcsTable->extIndexes=extIndexes;
/*
* It would be possible to share the swapLFNL data with a base converter,
* but the generated name would have to be different, and the memory
* would have to be free'd only once.
* It is easier to just create the data for the extension converter
* separately when it is requested.
*/
mbcsTable->swapLFNLStateTable=NULL;
mbcsTable->swapLFNLFromUnicodeBytes=NULL;
mbcsTable->swapLFNLName=NULL;
/*
* Set a special, runtime-only outputType if the extension converter
* is a DBCS version of a base converter that also maps single bytes.
*/
if( sharedData->staticData->conversionType==UCNV_DBCS ||
(sharedData->staticData->conversionType==UCNV_MBCS &&
sharedData->staticData->minBytesPerChar>=2)
) {
if(baseSharedData->mbcs.outputType==MBCS_OUTPUT_2_SISO) {
/* the base converter is SI/SO-stateful */
int32_t entry;
/* get the dbcs state from the state table entry for SO=0x0e */
entry=mbcsTable->stateTable[0][0xe];
if( MBCS_ENTRY_IS_FINAL(entry) &&
MBCS_ENTRY_FINAL_ACTION(entry)==MBCS_STATE_CHANGE_ONLY &&
MBCS_ENTRY_FINAL_STATE(entry)!=0
) {
mbcsTable->dbcsOnlyState=(uint8_t)MBCS_ENTRY_FINAL_STATE(entry);
mbcsTable->outputType=MBCS_OUTPUT_DBCS_ONLY;
}
} else if(
baseSharedData->staticData->conversionType==UCNV_MBCS &&
baseSharedData->staticData->minBytesPerChar==1 &&
baseSharedData->staticData->maxBytesPerChar==2 &&
mbcsTable->countStates<=127
) {
/* non-stateful base converter, need to modify the state table */
int32_t (*newStateTable)[256];
int32_t *state;
int32_t i, count;
/* allocate a new state table and copy the base state table contents */
count=mbcsTable->countStates;
newStateTable=(int32_t (*)[256])uprv_malloc((count+1)*1024);
if(newStateTable==NULL) {
ucnv_unload(baseSharedData);
*pErrorCode=U_MEMORY_ALLOCATION_ERROR;
return;
}
uprv_memcpy(newStateTable, mbcsTable->stateTable, count*1024);
/* change all final single-byte entries to go to a new all-illegal state */
state=newStateTable[0];
for(i=0; i<256; ++i) {
if(MBCS_ENTRY_IS_FINAL(state[i])) {
state[i]=MBCS_ENTRY_TRANSITION(count, 0);
}
}
/* build the new all-illegal state */
state=newStateTable[count];
for(i=0; i<256; ++i) {
state[i]=MBCS_ENTRY_FINAL(0, MBCS_STATE_ILLEGAL, 0);
}
mbcsTable->stateTable=(const int32_t (*)[256])newStateTable;
mbcsTable->countStates=(uint8_t)(count+1);
mbcsTable->stateTableOwned=TRUE;
mbcsTable->outputType=MBCS_OUTPUT_DBCS_ONLY;
}
}
} else {
/* make sure that the output type is known */
switch(mbcsTable->outputType) {
case MBCS_OUTPUT_1:
case MBCS_OUTPUT_2:
case MBCS_OUTPUT_3:
case MBCS_OUTPUT_4:
case MBCS_OUTPUT_3_EUC:
case MBCS_OUTPUT_4_EUC:
case MBCS_OUTPUT_2_SISO:
/* OK */
break;
default:
*pErrorCode=U_INVALID_TABLE_FORMAT;
return;
}
mbcsTable->countStates=(uint8_t)header->countStates;
mbcsTable->countToUFallbacks=header->countToUFallbacks;
mbcsTable->stateTable=(const int32_t (*)[256])(raw+sizeof(_MBCSHeader));
mbcsTable->toUFallbacks=(const _MBCSToUFallback *)(mbcsTable->stateTable+header->countStates);
mbcsTable->unicodeCodeUnits=(const uint16_t *)(raw+header->offsetToUCodeUnits);
mbcsTable->fromUnicodeTable=(const uint16_t *)(raw+header->offsetFromUTable);
mbcsTable->fromUnicodeBytes=(const uint8_t *)(raw+header->offsetFromUBytes);
mbcsTable->fromUBytesLength=header->fromUBytesLength;
}
/*
* converter versions 6.1 and up contain a unicodeMask that is
* used here to select the most efficient function implementations
*/
info.size=sizeof(UDataInfo);
udata_getInfo((UDataMemory *)sharedData->dataMemory, &info);
if(info.formatVersion[0]>6 || (info.formatVersion[0]==6 && info.formatVersion[1]>=1)) {
/* mask off possible future extensions to be safe */
mbcsTable->unicodeMask=(uint8_t)(sharedData->staticData->unicodeMask&3);
} else {
/* for older versions, assume worst case: contains anything possible (prevent over-optimizations) */
mbcsTable->unicodeMask=UCNV_HAS_SUPPLEMENTARY|UCNV_HAS_SURROGATES;
}
}
static void
_MBCSUnload(UConverterSharedData *sharedData) {
UConverterMBCSTable *mbcsTable=&sharedData->mbcs;
if(mbcsTable->swapLFNLStateTable!=NULL) {
uprv_free(mbcsTable->swapLFNLStateTable);
}
if(mbcsTable->stateTableOwned) {
uprv_free((void *)mbcsTable->stateTable);
}
if(mbcsTable->baseSharedData!=NULL) {
ucnv_unload(mbcsTable->baseSharedData);
}
}
static void
_MBCSOpen(UConverter *cnv,
const char *name,
const char *locale,
uint32_t options,
UErrorCode *pErrorCode) {
UConverterMBCSTable *mbcsTable;
const int32_t *extIndexes;
uint8_t outputType;
int8_t maxBytesPerUChar;
mbcsTable=&cnv->sharedData->mbcs;
outputType=mbcsTable->outputType;
if(outputType==MBCS_OUTPUT_DBCS_ONLY) {
/* the swaplfnl option does not apply, remove it */
cnv->options=options&=~UCNV_OPTION_SWAP_LFNL;
}
if((options&UCNV_OPTION_SWAP_LFNL)!=0) {
/* do this because double-checked locking is broken */
UBool isCached;
umtx_lock(NULL);
isCached=mbcsTable->swapLFNLStateTable!=NULL;
umtx_unlock(NULL);
if(!isCached) {
if(!_EBCDICSwapLFNL(cnv->sharedData, pErrorCode)) {
/* the option does not apply, remove it */
cnv->options=options&=~UCNV_OPTION_SWAP_LFNL;
}
}
}
if(uprv_strstr(name, "18030")!=NULL) {
if(uprv_strstr(name, "gb18030")!=NULL || uprv_strstr(name, "GB18030")!=NULL) {
/* set a flag for GB 18030 mode, which changes the callback behavior */
cnv->options|=_MBCS_OPTION_GB18030;
}
}
/* fix maxBytesPerUChar depending on outputType and options etc. */
if(outputType==MBCS_OUTPUT_2_SISO) {
cnv->maxBytesPerUChar=3; /* SO+DBCS */
}
extIndexes=mbcsTable->extIndexes;
if(extIndexes!=NULL) {
maxBytesPerUChar=(int8_t)UCNV_GET_MAX_BYTES_PER_UCHAR(extIndexes);
if(outputType==MBCS_OUTPUT_2_SISO) {
++maxBytesPerUChar; /* SO + multiple DBCS */
}
if(maxBytesPerUChar>cnv->maxBytesPerUChar) {
cnv->maxBytesPerUChar=maxBytesPerUChar;
}
}
#if 0
/*
* documentation of UConverter fields used for status
* all of these fields are (re)set to 0 by ucnv_bld.c and ucnv_reset()
*/
/* toUnicode */
cnv->toUnicodeStatus=0; /* offset */
cnv->mode=0; /* state */
cnv->toULength=0; /* byteIndex */
/* fromUnicode */
cnv->fromUChar32=0;
cnv->fromUnicodeStatus=1; /* prevLength */
#endif
}
static const char *
_MBCSGetName(const UConverter *cnv) {
if((cnv->options&UCNV_OPTION_SWAP_LFNL)!=0 && cnv->sharedData->mbcs.swapLFNLName!=NULL) {
return cnv->sharedData->mbcs.swapLFNLName;
} else {
return cnv->sharedData->staticData->name;
}
}
/* MBCS-to-Unicode conversion functions ------------------------------------- */
static UChar32
_MBCSGetFallback(UConverterMBCSTable *mbcsTable, uint32_t offset) {
const _MBCSToUFallback *toUFallbacks;
uint32_t i, start, limit;
limit=mbcsTable->countToUFallbacks;
if(limit>0) {
/* do a binary search for the fallback mapping */
toUFallbacks=mbcsTable->toUFallbacks;
start=0;
while(start<limit-1) {
i=(start+limit)/2;
if(offset<toUFallbacks[i].offset) {
limit=i;
} else {
start=i;
}
}
/* did we really find it? */
if(offset==toUFallbacks[start].offset) {
return toUFallbacks[start].codePoint;
}
}
return 0xfffe;
}
/* This version of _MBCSToUnicodeWithOffsets() is optimized for single-byte, single-state codepages. */
static void
_MBCSSingleToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs,
UErrorCode *pErrorCode) {
UConverter *cnv;
const uint8_t *source, *sourceLimit;
UChar *target;
const UChar *targetLimit;
int32_t *offsets;
const int32_t (*stateTable)[256];
int32_t sourceIndex;
int32_t entry;
UChar c;
uint8_t action;
/* 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;
if((cnv->options&UCNV_OPTION_SWAP_LFNL)!=0) {
stateTable=(const int32_t (*)[256])cnv->sharedData->mbcs.swapLFNLStateTable;
} else {
stateTable=cnv->sharedData->mbcs.stateTable;
}
/* sourceIndex=-1 if the current character began in the previous buffer */
sourceIndex=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) {
/* target is full */
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
break;
}
entry=stateTable[0][*source++];
/* MBCS_ENTRY_IS_FINAL(entry) */
/* test the most common case first */
if(MBCS_ENTRY_FINAL_IS_VALID_DIRECT_16(entry)) {
/* output BMP code point */
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
if(offsets!=NULL) {
*offsets++=sourceIndex;
}
/* normal end of action codes: prepare for a new character */
++sourceIndex;
continue;
}
/*
* An if-else-if chain provides more reliable performance for
* the most common cases compared to a switch.
*/
action=(uint8_t)(MBCS_ENTRY_FINAL_ACTION(entry));
if(action==MBCS_STATE_VALID_DIRECT_20 ||
(action==MBCS_STATE_FALLBACK_DIRECT_20 && UCNV_TO_U_USE_FALLBACK(cnv))
) {
entry=MBCS_ENTRY_FINAL_VALUE(entry);
/* 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;
break;
}
++sourceIndex;
continue;
} else if(action==MBCS_STATE_FALLBACK_DIRECT_16) {
if(UCNV_TO_U_USE_FALLBACK(cnv)) {
/* output BMP code point */
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
if(offsets!=NULL) {
*offsets++=sourceIndex;
}
++sourceIndex;
continue;
}
} else if(action==MBCS_STATE_UNASSIGNED) {
/* just fall through */
} else if(action==MBCS_STATE_ILLEGAL) {
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
} else {
/* reserved, must never occur */
++sourceIndex;
continue;
}
if(U_FAILURE(*pErrorCode)) {
/* callback(illegal) */
break;
} else /* unassigned sequences indicated with byteIndex>0 */ {
/* try an extension mapping */
pArgs->source=(const char *)source;
cnv->toUBytes[0]=*(source-1);
cnv->toULength=_extToU(cnv, cnv->sharedData,
1, (const char **)&source, (const char *)sourceLimit,
&target, targetLimit,
&offsets, sourceIndex,
pArgs->flush,
pErrorCode);
sourceIndex+=1+(int32_t)(source-(const uint8_t *)pArgs->source);
if(U_FAILURE(*pErrorCode)) {
/* not mappable or buffer overflow */
break;
}
}
}
/* write back the updated pointers */
pArgs->source=(const char *)source;
pArgs->target=target;
pArgs->offsets=offsets;
}
/*
* This version of _MBCSSingleToUnicodeWithOffsets() is optimized for single-byte, single-state codepages
* that only map to and from the BMP.
* In addition to single-byte optimizations, the offset calculations
* become much easier.
*/
static void
_MBCSSingleToBMPWithOffsets(UConverterToUnicodeArgs *pArgs,
UErrorCode *pErrorCode) {
UConverter *cnv;
const uint8_t *source, *sourceLimit, *lastSource;
UChar *target;
int32_t targetCapacity, length;
int32_t *offsets;
const int32_t (*stateTable)[256];
int32_t sourceIndex;
int32_t entry;
uint8_t action;
/* set up the local pointers */
cnv=pArgs->converter;
source=(const uint8_t *)pArgs->source;
sourceLimit=(const uint8_t *)pArgs->sourceLimit;
target=pArgs->target;
targetCapacity=pArgs->targetLimit-pArgs->target;
offsets=pArgs->offsets;
if((cnv->options&UCNV_OPTION_SWAP_LFNL)!=0) {
stateTable=(const int32_t (*)[256])cnv->sharedData->mbcs.swapLFNLStateTable;
} else {
stateTable=cnv->sharedData->mbcs.stateTable;
}
/* sourceIndex=-1 if the current character began in the previous buffer */
sourceIndex=0;
lastSource=source;
/*
* since the conversion here is 1:1 UChar:uint8_t, we need only one counter
* for the minimum of the sourceLength and targetCapacity
*/
length=sourceLimit-source;
if(length<targetCapacity) {
targetCapacity=length;
}
#if MBCS_UNROLL_SINGLE_TO_BMP
/* unrolling makes it faster on Pentium III/Windows 2000 */
/* unroll the loop with the most common case */
unrolled:
if(targetCapacity>=16) {
int32_t count, loops, oredEntries;
loops=count=targetCapacity>>4;
do {
oredEntries=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
oredEntries|=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
oredEntries|=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
oredEntries|=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
oredEntries|=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
oredEntries|=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
oredEntries|=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
oredEntries|=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
oredEntries|=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
oredEntries|=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
oredEntries|=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
oredEntries|=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
oredEntries|=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
oredEntries|=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
oredEntries|=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
oredEntries|=entry=stateTable[0][*source++];
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
/* were all 16 entries really valid? */
if(!MBCS_ENTRY_FINAL_IS_VALID_DIRECT_16(oredEntries)) {
/* no, return to the first of these 16 */
source-=16;
target-=16;
break;
}
} while(--count>0);
count=loops-count;
targetCapacity-=16*count;
if(offsets!=NULL) {
lastSource+=16*count;
while(count>0) {
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
--count;
}
}
}
#endif
/* conversion loop */
while(targetCapacity>0) {
entry=stateTable[0][*source++];
/* MBCS_ENTRY_IS_FINAL(entry) */
/* test the most common case first */
if(MBCS_ENTRY_FINAL_IS_VALID_DIRECT_16(entry)) {
/* output BMP code point */
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
--targetCapacity;
continue;
}
/*
* An if-else-if chain provides more reliable performance for
* the most common cases compared to a switch.
*/
action=(uint8_t)(MBCS_ENTRY_FINAL_ACTION(entry));
if(action==MBCS_STATE_FALLBACK_DIRECT_16) {
if(UCNV_TO_U_USE_FALLBACK(cnv)) {
/* output BMP code point */
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
--targetCapacity;
continue;
}
} else if(action==MBCS_STATE_UNASSIGNED) {
/* just fall through */
} else if(action==MBCS_STATE_ILLEGAL) {
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
} else {
/* reserved, must never occur */
continue;
}
/* set offsets since the start or the last extension */
if(offsets!=NULL) {
int32_t count=(int32_t)(source-lastSource);
/* predecrement: do not set the offset for the callback-causing character */
while(--count>0) {
*offsets++=sourceIndex++;
}
/* offset and sourceIndex are now set for the current character */
}
if(U_FAILURE(*pErrorCode)) {
/* callback(illegal) */
break;
} else /* unassigned sequences indicated with byteIndex>0 */ {
/* try an extension mapping */
lastSource=source;
cnv->toUBytes[0]=*(source-1);
cnv->toULength=_extToU(cnv, cnv->sharedData,
1, (const char **)&source, (const char *)sourceLimit,
&target, target+targetCapacity,
&offsets, sourceIndex,
pArgs->flush,
pErrorCode);
sourceIndex+=1+(int32_t)(source-lastSource);
if(U_FAILURE(*pErrorCode)) {
/* not mappable or buffer overflow */
break;
}
/* recalculate the targetCapacity after an extension mapping */
targetCapacity=pArgs->targetLimit-target;
length=sourceLimit-source;
if(length<targetCapacity) {
targetCapacity=length;
}
}
#if MBCS_UNROLL_SINGLE_TO_BMP
/* unrolling makes it faster on Pentium III/Windows 2000 */
goto unrolled;
#endif
}
if(U_SUCCESS(*pErrorCode) && source<sourceLimit && target>=pArgs->targetLimit) {
/* target is full */
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
}
/* set offsets since the start or the last callback */
if(offsets!=NULL) {
size_t count=source-lastSource;
while(count>0) {
*offsets++=sourceIndex++;
--count;
}
}
/* write back the updated pointers */
pArgs->source=(const char *)source;
pArgs->target=target;
pArgs->offsets=offsets;
}
U_CFUNC void
_MBCSToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs,
UErrorCode *pErrorCode) {
UConverter *cnv;
const uint8_t *source, *sourceLimit;
UChar *target;
const UChar *targetLimit;
int32_t *offsets;
const int32_t (*stateTable)[256];
const uint16_t *unicodeCodeUnits;
uint32_t offset;
uint8_t state;
int8_t byteIndex;
uint8_t *bytes;
int32_t sourceIndex, nextSourceIndex;
int32_t entry;
UChar c;
uint8_t action;
/* use optimized function if possible */
cnv=pArgs->converter;
if(cnv->preToULength>0) {
/*
* pass sourceIndex=-1 because we continue from an earlier buffer
* in the future, this may change with continuous offsets
*/
ucnv_extContinueMatchToU(cnv, pArgs, -1, pErrorCode);
if(U_FAILURE(*pErrorCode) || cnv->preToULength<0) {
return;
}
}
if(cnv->sharedData->mbcs.countStates==1) {
if(!(cnv->sharedData->mbcs.unicodeMask&UCNV_HAS_SUPPLEMENTARY)) {
_MBCSSingleToBMPWithOffsets(pArgs, pErrorCode);
} else {
_MBCSSingleToUnicodeWithOffsets(pArgs, pErrorCode);
}
return;
}
/* set up the local pointers */
source=(const uint8_t *)pArgs->source;
sourceLimit=(const uint8_t *)pArgs->sourceLimit;
target=pArgs->target;
targetLimit=pArgs->targetLimit;
offsets=pArgs->offsets;
if((cnv->options&UCNV_OPTION_SWAP_LFNL)!=0) {
stateTable=(const int32_t (*)[256])cnv->sharedData->mbcs.swapLFNLStateTable;
} else {
stateTable=cnv->sharedData->mbcs.stateTable;
}
unicodeCodeUnits=cnv->sharedData->mbcs.unicodeCodeUnits;
/* get the converter state from UConverter */
offset=cnv->toUnicodeStatus;
byteIndex=cnv->toULength;
bytes=cnv->toUBytes;
/*
* if we are in the SBCS state for a DBCS-only converter,
* then load the DBCS state from the MBCS data
* (dbcsOnlyState==0 if it is not a DBCS-only converter)
*/
if((state=(uint8_t)(cnv->mode))==0) {
state=cnv->sharedData->mbcs.dbcsOnlyState;
}
/* sourceIndex=-1 if the current character began in the previous buffer */
sourceIndex=byteIndex==0 ? 0 : -1;
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) {
/* target is full */
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
break;
}
if(byteIndex==0) {
/* optimized loop for 1/2-byte input and BMP output */
if(offsets==NULL) {
do {
entry=stateTable[state][*source];
if(MBCS_ENTRY_IS_TRANSITION(entry)) {
state=(uint8_t)MBCS_ENTRY_TRANSITION_STATE(entry);
offset=MBCS_ENTRY_TRANSITION_OFFSET(entry);
++source;
if( source<sourceLimit &&
MBCS_ENTRY_IS_FINAL(entry=stateTable[state][*source]) &&
MBCS_ENTRY_FINAL_ACTION(entry)==MBCS_STATE_VALID_16 &&
(c=unicodeCodeUnits[offset+MBCS_ENTRY_FINAL_VALUE_16(entry)])<0xfffe
) {
++source;
*target++=c;
state=(uint8_t)MBCS_ENTRY_FINAL_STATE(entry); /* typically 0 */
offset=0;
} else {
/* set the state and leave the optimized loop */
bytes[0]=*(source-1);
byteIndex=1;
break;
}
} else {
if(MBCS_ENTRY_FINAL_IS_VALID_DIRECT_16(entry)) {
/* output BMP code point */
++source;
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
state=(uint8_t)MBCS_ENTRY_FINAL_STATE(entry); /* typically 0 */
} else {
/* leave the optimized loop */
break;
}
}
} while(source<sourceLimit && target<targetLimit);
} else /* offsets!=NULL */ {
do {
entry=stateTable[state][*source];
if(MBCS_ENTRY_IS_TRANSITION(entry)) {
state=(uint8_t)MBCS_ENTRY_TRANSITION_STATE(entry);
offset=MBCS_ENTRY_TRANSITION_OFFSET(entry);
++source;
if( source<sourceLimit &&
MBCS_ENTRY_IS_FINAL(entry=stateTable[state][*source]) &&
MBCS_ENTRY_FINAL_ACTION(entry)==MBCS_STATE_VALID_16 &&
(c=unicodeCodeUnits[offset+MBCS_ENTRY_FINAL_VALUE_16(entry)])<0xfffe
) {
++source;
*target++=c;
if(offsets!=NULL) {
*offsets++=sourceIndex;
sourceIndex=(nextSourceIndex+=2);
}
state=(uint8_t)MBCS_ENTRY_FINAL_STATE(entry); /* typically 0 */
offset=0;
} else {
/* set the state and leave the optimized loop */
++nextSourceIndex;
bytes[0]=*(source-1);
byteIndex=1;
break;
}
} else {
if(MBCS_ENTRY_FINAL_IS_VALID_DIRECT_16(entry)) {
/* output BMP code point */
++source;
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
if(offsets!=NULL) {
*offsets++=sourceIndex;
sourceIndex=++nextSourceIndex;
}
state=(uint8_t)MBCS_ENTRY_FINAL_STATE(entry); /* typically 0 */
} else {
/* leave the optimized loop */
break;
}
}
} while(source<sourceLimit && target<targetLimit);
}
/*
* these tests and break statements could be put inside the loop
* if C had "break outerLoop" like Java
*/
if(source>=sourceLimit) {
break;
}
if(target>=targetLimit) {
/* target is full */
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
break;
}
++nextSourceIndex;
bytes[byteIndex++]=*source++;
} else /* byteIndex>0 */ {
++nextSourceIndex;
entry=stateTable[state][bytes[byteIndex++]=*source++];
}
if(MBCS_ENTRY_IS_TRANSITION(entry)) {
state=(uint8_t)MBCS_ENTRY_TRANSITION_STATE(entry);
offset+=MBCS_ENTRY_TRANSITION_OFFSET(entry);
continue;
}
/* save the previous state for proper extension mapping with SI/SO-stateful converters */
cnv->mode=state;
/* set the next state early so that we can reuse the entry variable */
state=(uint8_t)MBCS_ENTRY_FINAL_STATE(entry); /* typically 0 */
/*
* An if-else-if chain provides more reliable performance for
* the most common cases compared to a switch.
*/
action=(uint8_t)(MBCS_ENTRY_FINAL_ACTION(entry));
if(action==MBCS_STATE_VALID_16) {
offset+=MBCS_ENTRY_FINAL_VALUE_16(entry);
c=unicodeCodeUnits[offset];
if(c<0xfffe) {
/* output BMP code point */
*target++=c;
if(offsets!=NULL) {
*offsets++=sourceIndex;
}
byteIndex=0;
} else if(c==0xfffe) {
if(UCNV_TO_U_USE_FALLBACK(cnv) && (entry=(int32_t)_MBCSGetFallback(&cnv->sharedData->mbcs, offset))!=0xfffe) {
/* output fallback BMP code point */
*target++=(UChar)entry;
if(offsets!=NULL) {
*offsets++=sourceIndex;
}
byteIndex=0;
}
} else {
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
}
} else if(action==MBCS_STATE_VALID_DIRECT_16) {
/* output BMP code point */
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
if(offsets!=NULL) {
*offsets++=sourceIndex;
}
byteIndex=0;
} else if(action==MBCS_STATE_VALID_16_PAIR) {
offset+=MBCS_ENTRY_FINAL_VALUE_16(entry);
c=unicodeCodeUnits[offset++];
if(c<0xd800) {
/* output BMP code point below 0xd800 */
*target++=c;
if(offsets!=NULL) {
*offsets++=sourceIndex;
}
byteIndex=0;
} else if(UCNV_TO_U_USE_FALLBACK(cnv) ? c<=0xdfff : c<=0xdbff) {
/* output roundtrip or fallback surrogate pair */
*target++=(UChar)(c&0xdbff);
if(offsets!=NULL) {
*offsets++=sourceIndex;
}
byteIndex=0;
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;
break;
}
} else if(UCNV_TO_U_USE_FALLBACK(cnv) ? (c&0xfffe)==0xe000 : c==0xe000) {
/* output roundtrip BMP code point above 0xd800 or fallback BMP code point */
*target++=unicodeCodeUnits[offset];
if(offsets!=NULL) {
*offsets++=sourceIndex;
}
byteIndex=0;
} else if(c==0xffff) {
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
}
} else if(action==MBCS_STATE_VALID_DIRECT_20 ||
(action==MBCS_STATE_FALLBACK_DIRECT_20 && UCNV_TO_U_USE_FALLBACK(cnv))
) {
entry=MBCS_ENTRY_FINAL_VALUE(entry);
/* output surrogate pair */
*target++=(UChar)(0xd800|(UChar)(entry>>10));
if(offsets!=NULL) {
*offsets++=sourceIndex;
}
byteIndex=0;
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;
break;
}
} else if(action==MBCS_STATE_CHANGE_ONLY) {
/*
* 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(cnv->sharedData->mbcs.dbcsOnlyState==0) {
byteIndex=0;
} else {
/* SI/SO are illegal for DBCS-only conversion */
state=(uint8_t)(cnv->mode); /* restore the previous state */
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
}
} else if(action==MBCS_STATE_FALLBACK_DIRECT_16) {
if(UCNV_TO_U_USE_FALLBACK(cnv)) {
/* output BMP code point */
*target++=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
if(offsets!=NULL) {
*offsets++=sourceIndex;
}
byteIndex=0;
}
} else if(action==MBCS_STATE_UNASSIGNED) {
/* just fall through */
} else if(action==MBCS_STATE_ILLEGAL) {
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
} else {
/* reserved, must never occur */
byteIndex=0;
}
/* end of action codes: prepare for a new character */
offset=0;
if(byteIndex==0) {
sourceIndex=nextSourceIndex;
} else if(U_FAILURE(*pErrorCode)) {
/* callback(illegal) */
break;
} else /* unassigned sequences indicated with byteIndex>0 */ {
/* try an extension mapping */
pArgs->source=(const char *)source;
byteIndex=_extToU(cnv, cnv->sharedData,
byteIndex, (const char **)&source, (const char *)sourceLimit,
&target, targetLimit,
&offsets, sourceIndex,
pArgs->flush,
pErrorCode);
sourceIndex=nextSourceIndex+(int32_t)(source-(const uint8_t *)pArgs->source);
if(U_FAILURE(*pErrorCode)) {
/* not mappable or buffer overflow */
break;
}
}
}
/* 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;
}
/*
* This version of _MBCSGetNextUChar() is optimized for single-byte, single-state codepages.
* We still need a conversion loop in case we find reserved action codes, which are to be ignored.
*/
static UChar32
_MBCSSingleGetNextUChar(UConverterToUnicodeArgs *pArgs,
UErrorCode *pErrorCode) {
UConverter *cnv;
const int32_t (*stateTable)[256];
const uint8_t *source, *sourceLimit;
int32_t entry;
uint8_t action;
/* set up the local pointers */
cnv=pArgs->converter;
source=(const uint8_t *)pArgs->source;
sourceLimit=(const uint8_t *)pArgs->sourceLimit;
if((cnv->options&UCNV_OPTION_SWAP_LFNL)!=0) {
stateTable=(const int32_t (*)[256])cnv->sharedData->mbcs.swapLFNLStateTable;
} else {
stateTable=cnv->sharedData->mbcs.stateTable;
}
/* conversion loop */
while(source<sourceLimit) {
entry=stateTable[0][*source++];
/* MBCS_ENTRY_IS_FINAL(entry) */
/* write back the updated pointer early so that we can return directly */
pArgs->source=(const char *)source;
if(MBCS_ENTRY_FINAL_IS_VALID_DIRECT_16(entry)) {
/* output BMP code point */
return (UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
}
/*
* An if-else-if chain provides more reliable performance for
* the most common cases compared to a switch.
*/
action=(uint8_t)(MBCS_ENTRY_FINAL_ACTION(entry));
if( action==MBCS_STATE_VALID_DIRECT_20 ||
(action==MBCS_STATE_FALLBACK_DIRECT_20 && UCNV_TO_U_USE_FALLBACK(cnv))
) {
/* output supplementary code point */
return (UChar32)(MBCS_ENTRY_FINAL_VALUE(entry)+0x10000);
} else if(action==MBCS_STATE_FALLBACK_DIRECT_16) {
if(UCNV_TO_U_USE_FALLBACK(cnv)) {
/* output BMP code point */
return (UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
}
} else if(action==MBCS_STATE_UNASSIGNED) {
/* just fall through */
} else if(action==MBCS_STATE_ILLEGAL) {
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
} else {
/* reserved, must never occur */
continue;
}
if(U_FAILURE(*pErrorCode)) {
/* callback(illegal) */
break;
} else /* unassigned sequence */ {
/* defer to the generic implementation */
pArgs->source=(const char *)source-1;
return UCNV_GET_NEXT_UCHAR_USE_TO_U;
}
}
/* no output because of empty input or only state changes */
*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
return 0xffff;
}
/*
* Version of _MBCSToUnicodeWithOffsets() optimized for single-character
* conversion without offset handling.
*
* When a character does not have a mapping to Unicode, then we return to the
* generic ucnv_getNextUChar() code for extension/GB 18030 and error/callback
* handling.
* We also defer to the generic code in other complicated cases and have them
* ultimately handled by _MBCSToUnicodeWithOffsets() itself.
*
* All normal mappings and errors are handled here.
*/
static UChar32
_MBCSGetNextUChar(UConverterToUnicodeArgs *pArgs,
UErrorCode *pErrorCode) {
UConverter *cnv;
const uint8_t *source, *sourceLimit, *lastSource;
const int32_t (*stateTable)[256];
const uint16_t *unicodeCodeUnits;
uint32_t offset;
uint8_t state;
int32_t entry;
UChar32 c;
uint8_t action;
/* use optimized function if possible */
cnv=pArgs->converter;
if(cnv->preToULength>0) {
/* use the generic code in ucnv_getNextUChar() to continue with a partial match */
return UCNV_GET_NEXT_UCHAR_USE_TO_U;
}
if(cnv->sharedData->mbcs.unicodeMask&UCNV_HAS_SURROGATES) {
/*
* Using the generic ucnv_getNextUChar() code lets us deal correctly
* with the rare case of a codepage that maps single surrogates
* without adding the complexity to this already complicated function here.
*/
return UCNV_GET_NEXT_UCHAR_USE_TO_U;
} else if(cnv->sharedData->mbcs.countStates==1) {
return _MBCSSingleGetNextUChar(pArgs, pErrorCode);
}
/* set up the local pointers */
source=lastSource=(const uint8_t *)pArgs->source;
sourceLimit=(const uint8_t *)pArgs->sourceLimit;
if((cnv->options&UCNV_OPTION_SWAP_LFNL)!=0) {
stateTable=(const int32_t (*)[256])cnv->sharedData->mbcs.swapLFNLStateTable;
} else {
stateTable=cnv->sharedData->mbcs.stateTable;
}
unicodeCodeUnits=cnv->sharedData->mbcs.unicodeCodeUnits;
/* get the converter state from UConverter */
offset=cnv->toUnicodeStatus;
/*
* if we are in the SBCS state for a DBCS-only converter,
* then load the DBCS state from the MBCS data
* (dbcsOnlyState==0 if it is not a DBCS-only converter)
*/
if((state=(uint8_t)(cnv->mode))==0) {
state=cnv->sharedData->mbcs.dbcsOnlyState;
}
/* conversion loop */
c=U_SENTINEL;
while(source<sourceLimit) {
entry=stateTable[state][*source++];
if(MBCS_ENTRY_IS_TRANSITION(entry)) {
state=(uint8_t)MBCS_ENTRY_TRANSITION_STATE(entry);
offset+=MBCS_ENTRY_TRANSITION_OFFSET(entry);
/* optimization for 1/2-byte input and BMP output */
if( source<sourceLimit &&
MBCS_ENTRY_IS_FINAL(entry=stateTable[state][*source]) &&
MBCS_ENTRY_FINAL_ACTION(entry)==MBCS_STATE_VALID_16 &&
(c=unicodeCodeUnits[offset+MBCS_ENTRY_FINAL_VALUE_16(entry)])<0xfffe
) {
++source;
state=(uint8_t)MBCS_ENTRY_FINAL_STATE(entry); /* typically 0 */
/* output BMP code point */
break;
}
} else {
/* save the previous state for proper extension mapping with SI/SO-stateful converters */
cnv->mode=state;
/* set the next state early so that we can reuse the entry variable */
state=(uint8_t)MBCS_ENTRY_FINAL_STATE(entry); /* typically 0 */
/*
* An if-else-if chain provides more reliable performance for
* the most common cases compared to a switch.
*/
action=(uint8_t)(MBCS_ENTRY_FINAL_ACTION(entry));
if(action==MBCS_STATE_VALID_DIRECT_16) {
/* output BMP code point */
c=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
break;
} else if(action==MBCS_STATE_VALID_16) {
offset+=MBCS_ENTRY_FINAL_VALUE_16(entry);
c=unicodeCodeUnits[offset];
if(c<0xfffe) {
/* output BMP code point */
break;
} else if(c==0xfffe) {
if(UCNV_TO_U_USE_FALLBACK(cnv) && (c=_MBCSGetFallback(&cnv->sharedData->mbcs, offset))!=0xfffe) {
break;
}
} else {
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
}
} else if(action==MBCS_STATE_VALID_16_PAIR) {
offset+=MBCS_ENTRY_FINAL_VALUE_16(entry);
c=unicodeCodeUnits[offset++];
if(c<0xd800) {
/* output BMP code point below 0xd800 */
break;
} else if(UCNV_TO_U_USE_FALLBACK(cnv) ? c<=0xdfff : c<=0xdbff) {
/* output roundtrip or fallback supplementary code point */
c=((c&0x3ff)<<10)+unicodeCodeUnits[offset]+(0x10000-0xdc00);
break;
} else if(UCNV_TO_U_USE_FALLBACK(cnv) ? (c&0xfffe)==0xe000 : c==0xe000) {
/* output roundtrip BMP code point above 0xd800 or fallback BMP code point */
c=unicodeCodeUnits[offset];
break;
} else if(c==0xffff) {
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
}
} else if(action==MBCS_STATE_VALID_DIRECT_20 ||
(action==MBCS_STATE_FALLBACK_DIRECT_20 && UCNV_TO_U_USE_FALLBACK(cnv))
) {
/* output supplementary code point */
c=(UChar32)(MBCS_ENTRY_FINAL_VALUE(entry)+0x10000);
break;
} else if(action==MBCS_STATE_CHANGE_ONLY) {
/*
* 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(cnv->sharedData->mbcs.dbcsOnlyState!=0) {
/* SI/SO are illegal for DBCS-only conversion */
state=(uint8_t)(cnv->mode); /* restore the previous state */
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
}
} else if(action==MBCS_STATE_FALLBACK_DIRECT_16) {
if(UCNV_TO_U_USE_FALLBACK(cnv)) {
/* output BMP code point */
c=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
break;
}
} else if(action==MBCS_STATE_UNASSIGNED) {
/* just fall through */
} else if(action==MBCS_STATE_ILLEGAL) {
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
} else {
/* reserved (must never occur), or only state change */
offset=0;
lastSource=source;
continue;
}
/* end of action codes: prepare for a new character */
offset=0;
if(U_FAILURE(*pErrorCode)) {
/* callback(illegal) */
break;
} else /* unassigned sequence */ {
/* defer to the generic implementation */
cnv->toUnicodeStatus=0;
cnv->mode=state;
pArgs->source=(const char *)lastSource;
return UCNV_GET_NEXT_UCHAR_USE_TO_U;
}
}
}
if(c<0) {
if(U_SUCCESS(*pErrorCode) && source==sourceLimit && lastSource<source) {
*pErrorCode=U_TRUNCATED_CHAR_FOUND;
}
if(U_FAILURE(*pErrorCode)) {
/* incomplete character byte sequence */
uint8_t *bytes=cnv->toUBytes;
cnv->toULength=(int8_t)(source-lastSource);
do {
*bytes++=*lastSource++;
} while(lastSource<source);
} else {
/* no output because of empty input or only state changes */
*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
}
c=0xffff;
}
/* set the converter state back into UConverter, ready for a new character */
cnv->toUnicodeStatus=0;
cnv->mode=state;
/* write back the updated pointer */
pArgs->source=(const char *)source;
return c;
}
#if 0
/*
* Code disabled 2002dec09 (ICU 2.4) because it is not currently used in ICU. markus
* Removal improves code coverage.
*/
/**
* 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
_MBCSSingleSimpleGetNextUChar(UConverterSharedData *sharedData,
uint8_t b, UBool useFallback) {
int32_t entry;
uint8_t action;
entry=sharedData->mbcs.stateTable[0][b];
/* MBCS_ENTRY_IS_FINAL(entry) */
if(MBCS_ENTRY_FINAL_IS_VALID_DIRECT_16(entry)) {
/* output BMP code point */
return (UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
}
/*
* An if-else-if chain provides more reliable performance for
* the most common cases compared to a switch.
*/
action=(uint8_t)(MBCS_ENTRY_FINAL_ACTION(entry));
if(action==MBCS_STATE_VALID_DIRECT_20) {
/* output supplementary code point */
return 0x10000+MBCS_ENTRY_FINAL_VALUE(entry);
} else if(action==MBCS_STATE_FALLBACK_DIRECT_16) {
if(!TO_U_USE_FALLBACK(useFallback)) {
return 0xfffe;
}
/* output BMP code point */
return (UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
} else if(action==MBCS_STATE_FALLBACK_DIRECT_20) {
if(!TO_U_USE_FALLBACK(useFallback)) {
return 0xfffe;
}
/* output supplementary code point */
return 0x10000+MBCS_ENTRY_FINAL_VALUE(entry);
} else if(action==MBCS_STATE_UNASSIGNED) {
return 0xfffe;
} else if(action==MBCS_STATE_ILLEGAL) {
return 0xffff;
} else {
/* reserved, must never occur */
return 0xffff;
}
}
#endif
/*
* 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
_MBCSSimpleGetNextUChar(UConverterSharedData *sharedData,
const char *source, int32_t length,
UBool useFallback) {
const int32_t (*stateTable)[256];
const uint16_t *unicodeCodeUnits;
uint32_t offset;
uint8_t state, action;
UChar32 c;
int32_t i, entry;
if(length<=0) {
/* no input at all: "illegal" */
return 0xffff;
}
#if 0
/*
* Code disabled 2002dec09 (ICU 2.4) because it is not currently used in ICU. markus
* TODO In future releases, verify that this function is never called for SBCS
* conversions, i.e., that sharedData->mbcs.countStates==1 is still true.
* Removal improves code coverage.
*/
/* use optimized function if possible */
if(sharedData->mbcs.countStates==1) {
if(length==1) {
return _MBCSSingleSimpleGetNextUChar(sharedData, (uint8_t)*source, useFallback);
} else {
return 0xffff; /* illegal: more than a single byte for an SBCS converter */
}
}
#endif
/* set up the local pointers */
stateTable=sharedData->mbcs.stateTable;
unicodeCodeUnits=sharedData->mbcs.unicodeCodeUnits;
/* converter state */
offset=0;
state=sharedData->mbcs.dbcsOnlyState;
/* conversion loop */
for(i=0;;) {
entry=stateTable[state][(uint8_t)source[i++]];
if(MBCS_ENTRY_IS_TRANSITION(entry)) {
state=(uint8_t)MBCS_ENTRY_TRANSITION_STATE(entry);
offset+=MBCS_ENTRY_TRANSITION_OFFSET(entry);
if(i==length) {
return 0xffff; /* truncated character */
}
} else {
/*
* An if-else-if chain provides more reliable performance for
* the most common cases compared to a switch.
*/
action=(uint8_t)(MBCS_ENTRY_FINAL_ACTION(entry));
if(action==MBCS_STATE_VALID_16) {
offset+=MBCS_ENTRY_FINAL_VALUE_16(entry);
c=unicodeCodeUnits[offset];
if(c!=0xfffe) {
/* done */
} else if(UCNV_TO_U_USE_FALLBACK(cnv)) {
c=_MBCSGetFallback(&sharedData->mbcs, offset);
/* else done with 0xfffe */
}
break;
} else if(action==MBCS_STATE_VALID_DIRECT_16) {
/* output BMP code point */
c=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
break;
} else if(action==MBCS_STATE_VALID_16_PAIR) {
offset+=MBCS_ENTRY_FINAL_VALUE_16(entry);
c=unicodeCodeUnits[offset++];
if(c<0xd800) {
/* output BMP code point below 0xd800 */
} else if(UCNV_TO_U_USE_FALLBACK(cnv) ? c<=0xdfff : c<=0xdbff) {
/* output roundtrip or fallback supplementary code point */
c=(UChar32)(((c&0x3ff)<<10)+unicodeCodeUnits[offset]+(0x10000-0xdc00));
} else if(UCNV_TO_U_USE_FALLBACK(cnv) ? (c&0xfffe)==0xe000 : c==0xe000) {
/* output roundtrip BMP code point above 0xd800 or fallback BMP code point */
c=unicodeCodeUnits[offset];
} else if(c==0xffff) {
return 0xffff;
} else {
c=0xfffe;
}
break;
} else if(action==MBCS_STATE_VALID_DIRECT_20) {
/* output supplementary code point */
c=0x10000+MBCS_ENTRY_FINAL_VALUE(entry);
break;
} else if(action==MBCS_STATE_FALLBACK_DIRECT_16) {
if(!TO_U_USE_FALLBACK(useFallback)) {
c=0xfffe;
break;
}
/* output BMP code point */
c=(UChar)MBCS_ENTRY_FINAL_VALUE_16(entry);
break;
} else if(action==MBCS_STATE_FALLBACK_DIRECT_20) {
if(!TO_U_USE_FALLBACK(useFallback)) {
c=0xfffe;
break;
}
/* output supplementary code point */
c=0x10000+MBCS_ENTRY_FINAL_VALUE(entry);
break;
} else if(action==MBCS_STATE_UNASSIGNED) {
c=0xfffe;
break;
}
/*
* forbid MBCS_STATE_CHANGE_ONLY for this function,
* and MBCS_STATE_ILLEGAL and reserved action codes
*/
return 0xffff;
}
}
if(i!=length) {
/* illegal for this function: not all input consumed */
return 0xffff;
}
if(c==0xfffe) {
/* try an extension mapping */
const int32_t *cx=sharedData->mbcs.extIndexes;
if(cx!=NULL) {
return ucnv_extSimpleMatchToU(cx, source, length, useFallback);
}
}
return c;
}
/* MBCS-from-Unicode conversion functions ----------------------------------- */
/* This version of _MBCSFromUnicodeWithOffsets() is optimized for double-byte codepages. */
static void
_MBCSDoubleFromUnicodeWithOffsets(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;
UChar32 c;
int32_t sourceIndex, nextSourceIndex;
uint32_t stage2Entry;
uint32_t value;
int32_t length;
uint8_t unicodeMask;
/* use optimized function if possible */
cnv=pArgs->converter;
unicodeMask=cnv->sharedData->mbcs.unicodeMask;
/* 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->mbcs.fromUnicodeTable;
if((cnv->options&UCNV_OPTION_SWAP_LFNL)!=0) {
bytes=cnv->sharedData->mbcs.swapLFNLFromUnicodeBytes;
} else {
bytes=cnv->sharedData->mbcs.fromUnicodeBytes;
}
/* get the converter state from UConverter */
c=cnv->fromUChar32;
/* 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 "supplementary code point".
*/
c=*source++;
++nextSourceIndex;
/*
* This also tests if the codepage maps single surrogates.
* If it does, then surrogates are not paired but mapped separately.
* Note that in this case unmatched surrogates are not detected.
*/
if(UTF_IS_SURROGATE(c) && !(unicodeMask&UCNV_HAS_SURROGATES)) {
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);
if(!(unicodeMask&UCNV_HAS_SUPPLEMENTARY)) {
/* BMP-only codepages are stored without stage 1 entries for supplementary code points */
/* callback(unassigned) */
goto unassigned;
}
/* convert this supplementary code point */
/* exit this condition tree */
} else {
/* this is an unmatched lead code unit (1st surrogate) */
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
break;
}
} else {
/* no more input */
break;
}
} else {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
break;
}
}
/* convert the Unicode code point in c into codepage bytes */
stage2Entry=MBCS_STAGE_2_FROM_U(table, c);
/* get the bytes and the length for the output */
/* MBCS_OUTPUT_2 */
value=MBCS_VALUE_2_FROM_STAGE_2(bytes, stage2Entry, c);
if(value<=0xff) {
length=1;
} else {
length=2;
}
/* is this code point assigned, or do we use fallbacks? */
if(!(MBCS_FROM_U_IS_ROUNDTRIP(stage2Entry, c) ||
(UCNV_FROM_U_USE_FALLBACK(cnv, c) && value!=0))
) {
/*
* We allow a 0 byte output if the "assigned" bit is set for this entry.
* There is no way with this data structure for fallback output
* to be a zero byte.
*/
unassigned:
/* try an extension mapping */
pArgs->source=source;
c=_extFromU(cnv, cnv->sharedData,
c, &source, sourceLimit,
(char **)&target, (char *)target+targetCapacity,
&offsets, sourceIndex,
pArgs->flush,
pErrorCode);
nextSourceIndex+=(int32_t)(source-pArgs->source);
if(U_FAILURE(*pErrorCode)) {
/* not mappable or buffer overflow */
break;
} else {
/* a mapping was written to the target, continue */
/* recalculate the targetCapacity after an extension mapping */
targetCapacity=pArgs->targetLimit-(char *)target;
/* normal end of conversion: prepare for a new character */
sourceIndex=nextSourceIndex;
continue;
}
}
/* write the output character bytes from value and length */
/* from the first if in the loop we know that targetCapacity>0 */
if(length==1) {
/* this is easy because we know that there is enough space */
*target++=(uint8_t)value;
if(offsets!=NULL) {
*offsets++=sourceIndex;
}
--targetCapacity;
} else /* length==2 */ {
*target++=(uint8_t)(value>>8);
if(2<=targetCapacity) {
*target++=(uint8_t)value;
if(offsets!=NULL) {
*offsets++=sourceIndex;
*offsets++=sourceIndex;
}
targetCapacity-=2;
} else {
if(offsets!=NULL) {
*offsets++=sourceIndex;
}
cnv->charErrorBuffer[0]=(char)value;
cnv->charErrorBufferLength=1;
/* 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;
} else {
/* target is full */
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
break;
}
}
/* set the converter state back into UConverter */
cnv->fromUChar32=c;
/* write back the updated pointers */
pArgs->source=source;
pArgs->target=(char *)target;
pArgs->offsets=offsets;
}
/* This version of _MBCSFromUnicodeWithOffsets() is optimized for single-byte codepages. */
static 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 uint16_t *results;
UChar32 c;
int32_t sourceIndex, nextSourceIndex;
uint16_t value, minValue;
UBool hasSupplementary;
/* 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->mbcs.fromUnicodeTable;
if((cnv->options&UCNV_OPTION_SWAP_LFNL)!=0) {
results=(uint16_t *)cnv->sharedData->mbcs.swapLFNLFromUnicodeBytes;
} else {
results=(uint16_t *)cnv->sharedData->mbcs.fromUnicodeBytes;
}
if(cnv->useFallback) {
/* use all roundtrip and fallback results */
minValue=0x800;
} else {
/* use only roundtrips and fallbacks from private-use characters */
minValue=0xc00;
}
hasSupplementary=(UBool)(cnv->sharedData->mbcs.unicodeMask&UCNV_HAS_SUPPLEMENTARY);
/* get the converter state from UConverter */
c=cnv->fromUChar32;
/* 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 "supplementary 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);
if(!hasSupplementary) {
/* BMP-only codepages are stored without stage 1 entries for supplementary code points */
/* callback(unassigned) */
goto unassigned;
}
/* convert this supplementary code point */
/* exit this condition tree */
} else {
/* this is an unmatched lead code unit (1st surrogate) */
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
break;
}
} else {
/* no more input */
break;
}
} else {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
break;
}
}
/* convert the Unicode code point in c into codepage bytes */
value=MBCS_SINGLE_RESULT_FROM_U(table, results, c);
/* is this code point assigned, or do we use fallbacks? */
if(value>=minValue) {
/* assigned, 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;
} else { /* unassigned */
unassigned:
/* try an extension mapping */
pArgs->source=source;
c=_extFromU(cnv, cnv->sharedData,
c, &source, sourceLimit,
(char **)&target, (char *)target+targetCapacity,
&offsets, sourceIndex,
pArgs->flush,
pErrorCode);
nextSourceIndex+=(int32_t)(source-pArgs->source);
if(U_FAILURE(*pErrorCode)) {
/* not mappable or buffer overflow */
break;
} else {
/* a mapping was written to the target, continue */
/* recalculate the targetCapacity after an extension mapping */
targetCapacity=pArgs->targetLimit-(char *)target;
/* normal end of conversion: prepare for a new character */
sourceIndex=nextSourceIndex;
}
}
} else {
/* target is full */
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
break;
}
}
/* set the converter state back into UConverter */
cnv->fromUChar32=c;
/* write back the updated pointers */
pArgs->source=source;
pArgs->target=(char *)target;
pArgs->offsets=offsets;
}
/*
* This version of _MBCSFromUnicode() is optimized for single-byte codepages
* that map only to and from the BMP.
* In addition to single-byte/state optimizations, the offset calculations
* become much easier.
*/
static void
_MBCSSingleFromBMPWithOffsets(UConverterFromUnicodeArgs *pArgs,
UErrorCode *pErrorCode) {
UConverter *cnv;
const UChar *source, *sourceLimit, *lastSource;
uint8_t *target;
int32_t targetCapacity, length;
int32_t *offsets;
const uint16_t *table;
const uint16_t *results;
UChar32 c;
int32_t sourceIndex;
uint16_t value, minValue;
/* 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->mbcs.fromUnicodeTable;
if((cnv->options&UCNV_OPTION_SWAP_LFNL)!=0) {
results=(uint16_t *)cnv->sharedData->mbcs.swapLFNLFromUnicodeBytes;
} else {
results=(uint16_t *)cnv->sharedData->mbcs.fromUnicodeBytes;
}
if(cnv->useFallback) {
/* use all roundtrip and fallback results */
minValue=0x800;
} else {
/* use only roundtrips and fallbacks from private-use characters */
minValue=0xc00;
}
/* get the converter state from UConverter */
c=cnv->fromUChar32;
/* sourceIndex=-1 if the current character began in the previous buffer */
sourceIndex= c==0 ? 0 : -1;
lastSource=source;
/*
* since the conversion here is 1:1 UChar:uint8_t, we need only one counter
* for the minimum of the sourceLength and targetCapacity
*/
length=sourceLimit-source;
if(length<targetCapacity) {
targetCapacity=length;
}
/* conversion loop */
if(c!=0 && targetCapacity>0) {
goto getTrail;
}
#if MBCS_UNROLL_SINGLE_FROM_BMP
/* unrolling makes it slower on Pentium III/Windows 2000?! */
/* unroll the loop with the most common case */
unrolled:
if(targetCapacity>=4) {
int32_t count, loops;
uint16_t andedValues;
loops=count=targetCapacity>>2;
do {
c=*source++;
andedValues=value=MBCS_SINGLE_RESULT_FROM_U(table, results, c);
*target++=(uint8_t)value;
c=*source++;
andedValues&=value=MBCS_SINGLE_RESULT_FROM_U(table, results, c);
*target++=(uint8_t)value;
c=*source++;
andedValues&=value=MBCS_SINGLE_RESULT_FROM_U(table, results, c);
*target++=(uint8_t)value;
c=*source++;
andedValues&=value=MBCS_SINGLE_RESULT_FROM_U(table, results, c);
*target++=(uint8_t)value;
/* were all 4 entries really valid? */
if(andedValues<minValue) {
/* no, return to the first of these 4 */
source-=4;
target-=4;
break;
}
} while(--count>0);
count=loops-count;
targetCapacity-=4*count;
if(offsets!=NULL) {
lastSource+=4*count;
while(count>0) {
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
*offsets++=sourceIndex++;
--count;
}
}
c=0;
}
#endif
while(targetCapacity>0) {
/*
* Get a correct Unicode code point:
* a single UChar for a BMP code point or
* a matched surrogate pair for a "supplementary code point".
*/
c=*source++;
/*
* Do not immediately check for single surrogates:
* Assume that they are unassigned and check for them in that case.
* This speeds up the conversion of assigned characters.
*/
/* convert the Unicode code point in c into codepage bytes */
value=MBCS_SINGLE_RESULT_FROM_U(table, results, c);
/* is this code point assigned, or do we use fallbacks? */
if(value>=minValue) {
/* assigned, 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;
--targetCapacity;
/* normal end of conversion: prepare for a new character */
c=0;
continue;
} else if(!UTF_IS_SURROGATE(c)) {
/* normal, unassigned BMP character */
} else 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;
c=UTF16_GET_PAIR_VALUE(c, trail);
/* this codepage does not map supplementary code points */
/* callback(unassigned) */
} else {
/* this is an unmatched lead code unit (1st surrogate) */
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
break;
}
} else {
/* no more input */
break;
}
} else {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
break;
}
/* c does not have a mapping */
/* get the number of code units for c to correctly advance sourceIndex */
length=U16_LENGTH(c);
/* set offsets since the start or the last extension */
if(offsets!=NULL) {
int32_t count=(int32_t)(source-lastSource);
/* do not set the offset for this character */
count-=length;
while(count>0) {
*offsets++=sourceIndex++;
--count;
}
/* offsets and sourceIndex are now set for the current character */
}
/* try an extension mapping */
lastSource=source;
c=_extFromU(cnv, cnv->sharedData,
c, &source, sourceLimit,
(char **)&target, (char *)target+targetCapacity,
&offsets, sourceIndex,
pArgs->flush,
pErrorCode);
sourceIndex+=length+(int32_t)(source-lastSource);
lastSource=source;
if(U_FAILURE(*pErrorCode)) {
/* not mappable or buffer overflow */
break;
} else {
/* a mapping was written to the target, continue */
/* recalculate the targetCapacity after an extension mapping */
targetCapacity=pArgs->targetLimit-(char *)target;
length=sourceLimit-source;
if(length<targetCapacity) {
targetCapacity=length;
}
}
#if MBCS_UNROLL_SINGLE_FROM_BMP
/* unrolling makes it slower on Pentium III/Windows 2000?! */
goto unrolled;
#endif
}
if(U_SUCCESS(*pErrorCode) && source<sourceLimit && target>=(uint8_t *)pArgs->targetLimit) {
/* target is full */
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
}
/* set offsets since the start or the last callback */
if(offsets!=NULL) {
size_t count=source-lastSource;
while(count>0) {
*offsets++=sourceIndex++;
--count;
}
}
/* set the converter state back into UConverter */
cnv->fromUChar32=c;
/* write back the updated pointers */
pArgs->source=source;
pArgs->target=(char *)target;
pArgs->offsets=offsets;
}
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 *p, *bytes;
uint8_t outputType;
UChar32 c;
int32_t prevSourceIndex, sourceIndex, nextSourceIndex;
uint32_t stage2Entry;
uint32_t value;
int32_t length, prevLength;
uint8_t unicodeMask;
cnv=pArgs->converter;
if(cnv->preFromUFirstCP>=0) {
/*
* pass sourceIndex=-1 because we continue from an earlier buffer
* in the future, this may change with continuous offsets
*/
ucnv_extContinueMatchFromU(cnv, pArgs, -1, pErrorCode);
if(U_FAILURE(*pErrorCode) || cnv->preFromULength<0) {
return;
}
}
/* use optimized function if possible */
outputType=cnv->sharedData->mbcs.outputType;
unicodeMask=cnv->sharedData->mbcs.unicodeMask;
if(outputType==MBCS_OUTPUT_1 && !(unicodeMask&UCNV_HAS_SURROGATES)) {
if(!(unicodeMask&UCNV_HAS_SUPPLEMENTARY)) {
_MBCSSingleFromBMPWithOffsets(pArgs, pErrorCode);
} else {
_MBCSSingleFromUnicodeWithOffsets(pArgs, pErrorCode);
}
return;
} else if(outputType==MBCS_OUTPUT_2) {
_MBCSDoubleFromUnicodeWithOffsets(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->mbcs.fromUnicodeTable;
if((cnv->options&UCNV_OPTION_SWAP_LFNL)!=0) {
bytes=cnv->sharedData->mbcs.swapLFNLFromUnicodeBytes;
} else {
bytes=cnv->sharedData->mbcs.fromUnicodeBytes;
}
/* get the converter state from UConverter */
c=cnv->fromUChar32;
if(outputType==MBCS_OUTPUT_2_SISO) {
prevLength=cnv->fromUnicodeStatus;
if(prevLength==0) {
/* set the real value */
prevLength=1;
}
} else {
/* prevent fromUnicodeStatus from being set to something non-0 */
prevLength=0;
}
/* sourceIndex=-1 if the current character began in the previous buffer */
prevSourceIndex=-1;
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 "supplementary code point".
*/
c=*source++;
++nextSourceIndex;
/*
* This also tests if the codepage maps single surrogates.
* If it does, then surrogates are not paired but mapped separately.
* Note that in this case unmatched surrogates are not detected.
*/
if(UTF_IS_SURROGATE(c) && !(unicodeMask&UCNV_HAS_SURROGATES)) {
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);
if(!(unicodeMask&UCNV_HAS_SUPPLEMENTARY)) {
/* BMP-only codepages are stored without stage 1 entries for supplementary code points */
cnv->fromUnicodeStatus=prevLength; /* save the old state */
/* callback(unassigned) */
goto unassigned;
}
/* convert this supplementary code point */
/* exit this condition tree */
} else {
/* this is an unmatched lead code unit (1st surrogate) */
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
break;
}
} else {
/* no more input */
break;
}
} else {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
break;
}
}
/* convert the Unicode code point in c into codepage bytes */
/*
* The basic lookup is a triple-stage compact array (trie) lookup.
* For details see the beginning of this file.
*
* Single-byte codepages are handled with a different data structure
* by _MBCSSingle... functions.
*
* The result consists of a 32-bit value from stage 2 and
* a pointer to as many bytes as are stored per character.
* The pointer points to the character's bytes in stage 3.
* Bits 15..0 of the stage 2 entry contain the stage 3 index
* for that pointer, while bits 31..16 are flags for which of
* the 16 characters in the block are roundtrip-assigned.
*
* For 2-byte and 4-byte codepages, the bytes are stored as uint16_t
* respectively as uint32_t, in the platform encoding.
* For 3-byte codepages, the bytes are always stored in big-endian order.
*
* 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.
* The data structure does not support zero byte output as a fallback,
* and also does not allow output of leading zeros.
*/
stage2Entry=MBCS_STAGE_2_FROM_U(table, c);
/* get the bytes and the length for the output */
switch(outputType) {
case MBCS_OUTPUT_2:
value=MBCS_VALUE_2_FROM_STAGE_2(bytes, stage2Entry, c);
if(value<=0xff) {
length=1;
} else {
length=2;
}
break;
case MBCS_OUTPUT_2_SISO:
/* 1/2-byte stateful with Shift-In/Shift-Out */
/*
* Save the old state in the converter object
* right here, then change the local prevLength state variable if necessary.
* Then, if this character turns out to be unassigned or a fallback that
* is not taken, the callback code must not save the new state in the converter
* because the new state is for a character that is not output.
* However, the callback must still restore the state from the converter
* in case the callback function changed it for its output.
*/
cnv->fromUnicodeStatus=prevLength; /* save the old state */
value=MBCS_VALUE_2_FROM_STAGE_2(bytes, stage2Entry, c);
if(value<=0xff) {
if(value==0 && MBCS_FROM_U_IS_ROUNDTRIP(stage2Entry, c)==0) {
/* no mapping, leave value==0 */
length=0;
} else if(prevLength<=1) {
length=1;
} else {
/* change from double-byte mode to single-byte */
value|=(uint32_t)UCNV_SI<<8;
length=2;
prevLength=1;
}
} else {
if(prevLength==2) {
length=2;
} else {
/* change from single-byte mode to double-byte */
value|=(uint32_t)UCNV_SO<<16;
length=3;
prevLength=2;
}
}
break;
case MBCS_OUTPUT_DBCS_ONLY:
/* table with single-byte results, but only DBCS mappings used */
value=MBCS_VALUE_2_FROM_STAGE_2(bytes, stage2Entry, c);
if(value<=0xff) {
/* no mapping or SBCS result, not taken for DBCS-only */
value=stage2Entry=0; /* stage2Entry=0 to reset roundtrip flags */
length=0;
} else {
length=2;
}
break;
case MBCS_OUTPUT_3:
p=MBCS_POINTER_3_FROM_STAGE_2(bytes, stage2Entry, c);
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:
value=MBCS_VALUE_4_FROM_STAGE_2(bytes, stage2Entry, c);
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:
value=MBCS_VALUE_2_FROM_STAGE_2(bytes, stage2Entry, c);
/* 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=MBCS_POINTER_3_FROM_STAGE_2(bytes, stage2Entry, c);
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=stage2Entry=0; /* stage2Entry=0 to reset roundtrip flags */
length=0;
break;
}
/* is this code point assigned, or do we use fallbacks? */
if(!(MBCS_FROM_U_IS_ROUNDTRIP(stage2Entry, c)!=0 ||
(UCNV_FROM_U_USE_FALLBACK(cnv, c) && value!=0))
) {
/*
* We allow a 0 byte output if the "assigned" bit is set for this entry.
* There is no way with this data structure for fallback output
* to be a zero byte.
*/
unassigned:
/* try an extension mapping */
pArgs->source=source;
c=_extFromU(cnv, cnv->sharedData,
c, &source, sourceLimit,
(char **)&target, (char *)target+targetCapacity,
&offsets, sourceIndex,
pArgs->flush,
pErrorCode);
nextSourceIndex+=(int32_t)(source-pArgs->source);
prevLength=cnv->fromUnicodeStatus; /* restore SISO state */
if(U_FAILURE(*pErrorCode)) {
/* not mappable or buffer overflow */
break;
} else {
/* a mapping was written to the target, continue */
/* recalculate the targetCapacity after an extension mapping */
targetCapacity=pArgs->targetLimit-(char *)target;
/* normal end of conversion: prepare for a new character */
if(offsets!=NULL) {
prevSourceIndex=sourceIndex;
sourceIndex=nextSourceIndex;
}
continue;
}
}
/* 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 *charErrorBuffer;
/*
* 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;
charErrorBuffer=(uint8_t *)cnv->charErrorBuffer;
switch(length) {
/* each branch falls through to the next one */
case 3:
*charErrorBuffer++=(uint8_t)(value>>16);
case 2:
*charErrorBuffer++=(uint8_t)(value>>8);
case 1:
*charErrorBuffer=(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;
if(offsets!=NULL) {
prevSourceIndex=sourceIndex;
sourceIndex=nextSourceIndex;
}
continue;
} else {
/* target is full */
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
break;
}
}
/*
* the end of the input stream and detection of truncated input
* are handled by the framework, but for EBCDIC_STATEFUL conversion
* we need to emit an SI at the very end
*
* conditions:
* successful
* EBCDIC_STATEFUL in DBCS mode
* end of input and no truncated input
*/
if( U_SUCCESS(*pErrorCode) &&
outputType==MBCS_OUTPUT_2_SISO && prevLength==2 &&
pArgs->flush && source>=sourceLimit && c==0
) {
/* EBCDIC_STATEFUL ending with DBCS: emit an SI to return the output stream to SBCS */
if(targetCapacity>0) {
*target++=(uint8_t)UCNV_SI;
if(offsets!=NULL) {
/* set the last source character's index (sourceIndex points at sourceLimit now) */
*offsets++=prevSourceIndex;
}
} else {
/* target is full */
cnv->charErrorBuffer[0]=(char)UCNV_SI;
cnv->charErrorBufferLength=1;
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
}
prevLength=1; /* we switched into SBCS */
}
/* set the converter state back into UConverter */
cnv->fromUChar32=c;
cnv->fromUnicodeStatus=prevLength;
/* 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 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
_MBCSFromUChar32(UConverterSharedData *sharedData,
UChar32 c, uint32_t *pValue,
UBool useFallback) {
const uint16_t *table=sharedData->mbcs.fromUnicodeTable;
const uint8_t *p;
uint32_t stage2Entry;
uint32_t value;
int32_t length;
/* BMP-only codepages are stored without stage 1 entries for supplementary code points */
if(c>=0x10000 && !(sharedData->mbcs.unicodeMask&UCNV_HAS_SUPPLEMENTARY)) {
return 0;
}
/* convert the Unicode code point in c into codepage bytes (same as in _MBCSFromUnicodeWithOffsets) */
if(sharedData->mbcs.outputType==MBCS_OUTPUT_1) {
value=MBCS_SINGLE_RESULT_FROM_U(table, (uint16_t *)sharedData->mbcs.fromUnicodeBytes, c);
/* is this code point assigned, or do we use fallbacks? */
if(useFallback ? value>=0x800 : value>=0xc00) {
*pValue=value&0xff;
return 1;
} else {
return 0;
}
}
stage2Entry=MBCS_STAGE_2_FROM_U(table, c);
/* get the bytes and the length for the output */
switch(sharedData->mbcs.outputType) {
case MBCS_OUTPUT_2:
value=MBCS_VALUE_2_FROM_STAGE_2(sharedData->mbcs.fromUnicodeBytes, stage2Entry, c);
if(value<=0xff) {
length=1;
} else {
length=2;
}
break;
case MBCS_OUTPUT_DBCS_ONLY:
/* table with single-byte results, but only DBCS mappings used */
value=MBCS_VALUE_2_FROM_STAGE_2(sharedData->mbcs.fromUnicodeBytes, stage2Entry, c);
if(value<=0xff) {
/* no mapping or SBCS result, not taken for DBCS-only */
value=stage2Entry=0; /* stage2Entry=0 to reset roundtrip flags */
length=0;
} else {
length=2;
}
break;
case MBCS_OUTPUT_3:
p=MBCS_POINTER_3_FROM_STAGE_2(sharedData->mbcs.fromUnicodeBytes, stage2Entry, c);
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:
value=MBCS_VALUE_4_FROM_STAGE_2(sharedData->mbcs.fromUnicodeBytes, stage2Entry, c);
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:
value=MBCS_VALUE_2_FROM_STAGE_2(sharedData->mbcs.fromUnicodeBytes, stage2Entry, c);
/* 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=MBCS_POINTER_3_FROM_STAGE_2(sharedData->mbcs.fromUnicodeBytes, stage2Entry, c);
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 this code point assigned, or do we use fallbacks? */
if( MBCS_FROM_U_IS_ROUNDTRIP(stage2Entry, c) ||
(FROM_U_USE_FALLBACK(useFallback, c) && value!=0)
) {
/*
* We allow a 0 byte output if the "assigned" bit is set for this entry.
* There is no way with this data structure for fallback output
* to be a zero byte.
*/
/* assigned */
*pValue=value;
return length;
} else {
const int32_t *cx=sharedData->mbcs.extIndexes;
if(cx!=NULL) {
return ucnv_extSimpleMatchFromU(cx, c, pValue, useFallback);
}
/* unassigned */
return 0;
}
}
#if 0
/*
* This function has been moved to ucnv2022.c for inlining.
* This implementation is here only for documentation purposes
*/
/**
* This version of _MBCSFromUChar32() is optimized for single-byte codepages.
* It does not handle the EBCDIC swaplfnl option (set in UConverter).
* It does not handle conversion extensions (_extFromU()).
*
* It returns the codepage byte for the code point, or -1 if it is unassigned.
*/
U_CFUNC int32_t
_MBCSSingleFromUChar32(UConverterSharedData *sharedData,
UChar32 c,
UBool useFallback) {
const uint16_t *table;
int32_t value;
/* BMP-only codepages are stored without stage 1 entries for supplementary code points */
if(c>=0x10000 && !(sharedData->mbcs.unicodeMask&UCNV_HAS_SUPPLEMENTARY)) {
return -1;
}
/* convert the Unicode code point in c into codepage bytes (same as in _MBCSFromUnicodeWithOffsets) */
table=sharedData->mbcs.fromUnicodeTable;
/* get the byte for the output */
value=MBCS_SINGLE_RESULT_FROM_U(table, (uint16_t *)sharedData->mbcs.fromUnicodeBytes, c);
/* is this code point assigned, or do we use fallbacks? */
if(useFallback ? value>=0x800 : value>=0xc00) {
return value&0xff;
} else {
return -1;
}
}
#endif
/* miscellaneous ------------------------------------------------------------ */
static void
_MBCSGetStarters(const UConverter* cnv,
UBool starters[256],
UErrorCode *pErrorCode) {
const int32_t *state0;
int i;
state0=cnv->sharedData->mbcs.stateTable[cnv->sharedData->mbcs.dbcsOnlyState];
for(i=0; i<256; ++i) {
/* all bytes that cause a state transition from state 0 are lead bytes */
starters[i]= (UBool)MBCS_ENTRY_IS_TRANSITION(state0[i]);
}
}
/*
* 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)MBCS_ENTRY_IS_TRANSITION(sharedData->mbcs.stateTable[0][(uint8_t)byte]);
}
static void
_MBCSWriteSub(UConverterFromUnicodeArgs *pArgs,
int32_t offsetIndex,
UErrorCode *pErrorCode) {
UConverter *cnv=pArgs->converter;
char *p, *subchar;
char buffer[4];
int32_t length;
/* first, select between subChar and subChar1 */
if( cnv->subChar1!=0 &&
(cnv->sharedData->mbcs.extIndexes!=NULL ?
cnv->useSubChar1 :
(cnv->invalidUCharBuffer[0]<=0xff))
) {
/* select subChar1 if it is set (not 0) and the unmappable Unicode code point is up to U+00ff (IBM MBCS behavior) */
subchar=(char *)&cnv->subChar1;
length=1;
} else {
/* select subChar in all other cases */
subchar=(char *)cnv->subChar;
length=cnv->subCharLen;
}
/* reset the selector for the next code point */
cnv->useSubChar1=FALSE;
switch(cnv->sharedData->mbcs.outputType) {
case MBCS_OUTPUT_2_SISO:
p=buffer;
/* fromUnicodeStatus contains prevLength */
switch(length) {
case 1:
if(cnv->fromUnicodeStatus==2) {
/* DBCS mode and SBCS sub char: change to SBCS */
cnv->fromUnicodeStatus=1;
*p++=UCNV_SI;
}
*p++=subchar[0];
break;
case 2:
if(cnv->fromUnicodeStatus<=1) {
/* SBCS mode and DBCS sub char: change to DBCS */
cnv->fromUnicodeStatus=2;
*p++=UCNV_SO;
}
*p++=subchar[0];
*p++=subchar[1];
break;
default:
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return;
}
ucnv_cbFromUWriteBytes(pArgs,
buffer, (int32_t)(p-buffer),
offsetIndex, pErrorCode);
break;
default:
ucnv_cbFromUWriteBytes(pArgs,
subchar, length,
offsetIndex, pErrorCode);
break;
}
}
U_CFUNC UConverterType
_MBCSGetType(const UConverter* converter) {
/* SBCS, DBCS, and EBCDIC_STATEFUL are replaced by MBCS, but here we cheat a little */
if(converter->sharedData->mbcs.countStates==1) {
return (UConverterType)UCNV_SBCS;
} else if((converter->sharedData->mbcs.outputType&0xff)==MBCS_OUTPUT_2_SISO) {
return (UConverterType)UCNV_EBCDIC_STATEFUL;
} else if(converter->sharedData->staticData->minBytesPerChar==2 && converter->sharedData->staticData->maxBytesPerChar==2) {
return (UConverterType)UCNV_DBCS;
}
return (UConverterType)UCNV_MBCS;
}
static const UConverterImpl _MBCSImpl={
UCNV_MBCS,
_MBCSLoad,
_MBCSUnload,
_MBCSOpen,
NULL,
NULL,
_MBCSToUnicodeWithOffsets,
_MBCSToUnicodeWithOffsets,
_MBCSFromUnicodeWithOffsets,
_MBCSFromUnicodeWithOffsets,
_MBCSGetNextUChar,
_MBCSGetStarters,
_MBCSGetName,
_MBCSWriteSub,
NULL,
_MBCSGetUnicodeSet
};
/* 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
};
#endif /* #if !UCONFIG_NO_LEGACY_CONVERSION */
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