blob: 5d921163bff84e641bf7078938ef825e8a6782a3 [file] [log] [blame]
/*
******************************************************************************
* Copyright (c) 1996-2003, International Business Machines
* Corporation and others. All Rights Reserved.
******************************************************************************
* File unorm.cpp
*
* Created by: Vladimir Weinstein 12052000
*
* Modification history :
*
* Date Name Description
* 02/01/01 synwee Added normalization quickcheck enum and method.
* 02/12/01 synwee Commented out quickcheck util api has been approved
* Added private method for doing FCD checks
* 02/23/01 synwee Modified quickcheck and checkFCE to run through
* string for codepoints < 0x300 for the normalization
* mode NFC.
* 05/25/01+ Markus Scherer total rewrite, implement all normalization here
* instead of just wrappers around normlzr.cpp,
* load unorm.dat, support Unicode 3.1 with
* supplementary code points, etc.
*/
#include "unicode/utypes.h"
// moved up to make unorm_cmpEquivFold work without normalization
#include "unicode/ustring.h"
#include "unormimp.h"
#include "ustr_imp.h"
#if !UCONFIG_NO_NORMALIZATION
#include "unicode/udata.h"
#include "unicode/uchar.h"
#include "unicode/uiter.h"
#include "unicode/uniset.h"
#include "unicode/usetiter.h"
#include "unicode/unorm.h"
#include "cmemory.h"
#include "umutex.h"
#include "utrie.h"
#include "unicode/uset.h"
#include "udataswp.h"
/*
* Status of tailored normalization
*
* This was done initially for investigation on Unicode public review issue 7
* (http://www.unicode.org/review/). See Jitterbug 2481.
* While the UTC at meeting #94 (2003mar) did not take up the issue, this is
* a permanent feature in ICU 2.6 in support of IDNA which requires true
* Unicode 3.2 normalization.
* (NormalizationCorrections are rolled into IDNA mapping tables.)
*
* Tailored normalization as implemented here allows to "normalize less"
* than full Unicode normalization would.
* Based internally on a UnicodeSet of code points that are
* "excluded from normalization", the normalization functions leave those
* code points alone ("inert"). This means that tailored normalization
* still transforms text into a canonically equivalent form.
* It does not add decompositions to code points that do not have any or
* change decomposition results.
*
* Any function that searches for a safe boundary has not been touched,
* which means that these functions will be over-pessimistic when
* exclusions are applied.
* This should not matter because subsequent checks and normalizations
* do apply the exclusions; only a little more of the text may be processed
* than necessary under exclusions.
*
* Normalization exclusions have the following effect on excluded code points c:
* - c is not decomposed
* - c is not a composition target
* - c does not combine forward or backward for composition
* except that this is not implemented for Jamo
* - c is treated as having a combining class of 0
*/
#define LENGTHOF(array) (sizeof(array)/sizeof((array)[0]))
/*
* This new implementation of the normalization code loads its data from
* unorm.dat, which is generated with the gennorm tool.
* The format of that file is described in unormimp.h .
*/
/* -------------------------------------------------------------------------- */
enum {
_STACK_BUFFER_CAPACITY=100
};
/*
* Constants for the bit fields in the options bit set parameter.
* These need not be public.
* A user only needs to know the currently assigned values.
* The number and positions of reserved bits per field can remain private
* and may change in future implementations.
*/
enum {
_NORM_OPTIONS_NX_MASK=0x1f,
_NORM_OPTIONS_UNICODE_MASK=0xe0,
_NORM_OPTIONS_SETS_MASK=0xff,
_NORM_OPTIONS_UNICODE_SHIFT=5
};
static inline UBool
isHangulWithoutJamoT(UChar c) {
c-=HANGUL_BASE;
return c<HANGUL_COUNT && c%JAMO_T_COUNT==0;
}
/* norm32 helpers */
/* is this a norm32 with a regular index? */
static inline UBool
isNorm32Regular(uint32_t norm32) {
return norm32<_NORM_MIN_SPECIAL;
}
/* is this a norm32 with a special index for a lead surrogate? */
static inline UBool
isNorm32LeadSurrogate(uint32_t norm32) {
return _NORM_MIN_SPECIAL<=norm32 && norm32<_NORM_SURROGATES_TOP;
}
/* is this a norm32 with a special index for a Hangul syllable or a Jamo? */
static inline UBool
isNorm32HangulOrJamo(uint32_t norm32) {
return norm32>=_NORM_MIN_HANGUL;
}
/*
* Given isNorm32HangulOrJamo(),
* is this a Hangul syllable or a Jamo?
*/
static inline UBool
isHangulJamoNorm32HangulOrJamoL(uint32_t norm32) {
return norm32<_NORM_MIN_JAMO_V;
}
/*
* Given norm32 for Jamo V or T,
* is this a Jamo V?
*/
static inline UBool
isJamoVTNorm32JamoV(uint32_t norm32) {
return norm32<_NORM_JAMO_V_TOP;
}
/* load unorm.dat ----------------------------------------------------------- */
#define DATA_NAME "unorm"
#define DATA_TYPE "icu"
static UDataMemory *normData=NULL;
static UErrorCode dataErrorCode=U_ZERO_ERROR;
static int8_t haveNormData=0;
static int32_t indexes[_NORM_INDEX_TOP]={ 0 };
static UTrie normTrie={ 0,0,0,0,0,0,0 }, fcdTrie={ 0,0,0,0,0,0,0 }, auxTrie={ 0,0,0,0,0,0,0 };
/*
* pointers into the memory-mapped unorm.icu
*/
static const uint16_t *extraData=NULL,
*combiningTable=NULL,
*canonStartSets=NULL;
static uint8_t formatVersion[4]={ 0, 0, 0, 0 };
static UBool formatVersion_2_1=FALSE, formatVersion_2_2=FALSE;
/* the Unicode version of the normalization data */
static UVersionInfo dataVersion={ 0, 0, 0, 0 };
/* cache UnicodeSets for each combination of exclusion flags */
static UnicodeSet *nxCache[_NORM_OPTIONS_SETS_MASK+1]={ NULL };
U_CDECL_BEGIN
UBool
unorm_cleanup() {
int32_t i;
if(normData!=NULL) {
udata_close(normData);
normData=NULL;
}
dataErrorCode=U_ZERO_ERROR;
haveNormData=0;
for(i=0; i<(int32_t)LENGTHOF(nxCache); ++i) {
delete nxCache[i];
}
uprv_memset(nxCache, 0, sizeof(nxCache));
return TRUE;
}
/* normTrie: 32-bit trie result may contain a special extraData index with the folding offset */
static int32_t U_CALLCONV
getFoldingNormOffset(uint32_t norm32) {
if(isNorm32LeadSurrogate(norm32)) {
return
UTRIE_BMP_INDEX_LENGTH+
(((int32_t)norm32>>(_NORM_EXTRA_SHIFT-UTRIE_SURROGATE_BLOCK_BITS))&
(0x3ff<<UTRIE_SURROGATE_BLOCK_BITS));
} else {
return 0;
}
}
/* fcdTrie: the folding offset is the lead FCD value itself */
static int32_t U_CALLCONV
getFoldingFCDOffset(uint32_t data) {
return (int32_t)data;
}
/* auxTrie: the folding offset is in bits 9..0 of the 16-bit trie result */
static int32_t U_CALLCONV
getFoldingAuxOffset(uint32_t data) {
return (int32_t)(data&_NORM_AUX_FNC_MASK)<<UTRIE_SURROGATE_BLOCK_BITS;
}
static UBool U_CALLCONV
isAcceptable(void * /* context */,
const char * /* type */, const char * /* name */,
const UDataInfo *pInfo) {
if(
pInfo->size>=20 &&
pInfo->isBigEndian==U_IS_BIG_ENDIAN &&
pInfo->charsetFamily==U_CHARSET_FAMILY &&
pInfo->dataFormat[0]==0x4e && /* dataFormat="Norm" */
pInfo->dataFormat[1]==0x6f &&
pInfo->dataFormat[2]==0x72 &&
pInfo->dataFormat[3]==0x6d &&
pInfo->formatVersion[0]==2 &&
pInfo->formatVersion[2]==UTRIE_SHIFT &&
pInfo->formatVersion[3]==UTRIE_INDEX_SHIFT
) {
uprv_memcpy(formatVersion, pInfo->formatVersion, 4);
uprv_memcpy(dataVersion, pInfo->dataVersion, 4);
return TRUE;
} else {
return FALSE;
}
}
static UBool U_CALLCONV
_enumPropertyStartsRange(const void *context, UChar32 start, UChar32 /*limit*/, uint32_t /*value*/) {
/* add the start code point to the USet */
uset_add((USet *)context, start);
return TRUE;
}
U_CDECL_END
static int8_t
loadNormData(UErrorCode &errorCode) {
/* load Unicode normalization data from file */
/*
* This lazy intialization with double-checked locking (without mutex protection for
* haveNormData==0) is transiently unsafe under certain circumstances.
* Check the readme and use u_init() if necessary.
*
* While u_init() initializes the main normalization data via this functions,
* it does not do so for exclusion sets (which are fully mutexed).
* This is because
* - there can be many exclusion sets
* - they are rarely used
* - they are not usually used in execution paths that are
* as performance-sensitive as others
* (e.g., IDNA takes more time than unorm_quickCheck() anyway)
*/
if(haveNormData==0) {
UTrie _normTrie={ 0,0,0,0,0,0,0 }, _fcdTrie={ 0,0,0,0,0,0,0 }, _auxTrie={ 0,0,0,0,0,0,0 };
UDataMemory *data;
const int32_t *p=NULL;
const uint8_t *pb;
if(&errorCode==NULL || U_FAILURE(errorCode)) {
return 0;
}
/* open the data outside the mutex block */
data=udata_openChoice(NULL, DATA_TYPE, DATA_NAME, isAcceptable, NULL, &errorCode);
dataErrorCode=errorCode;
if(U_FAILURE(errorCode)) {
return haveNormData=-1;
}
p=(const int32_t *)udata_getMemory(data);
pb=(const uint8_t *)(p+_NORM_INDEX_TOP);
utrie_unserialize(&_normTrie, pb, p[_NORM_INDEX_TRIE_SIZE], &errorCode);
_normTrie.getFoldingOffset=getFoldingNormOffset;
pb+=p[_NORM_INDEX_TRIE_SIZE]+p[_NORM_INDEX_UCHAR_COUNT]*2+p[_NORM_INDEX_COMBINE_DATA_COUNT]*2;
utrie_unserialize(&_fcdTrie, pb, p[_NORM_INDEX_FCD_TRIE_SIZE], &errorCode);
_fcdTrie.getFoldingOffset=getFoldingFCDOffset;
if(p[_NORM_INDEX_FCD_TRIE_SIZE]!=0) {
pb+=p[_NORM_INDEX_FCD_TRIE_SIZE];
utrie_unserialize(&_auxTrie, pb, p[_NORM_INDEX_AUX_TRIE_SIZE], &errorCode);
_auxTrie.getFoldingOffset=getFoldingAuxOffset;
}
if(U_FAILURE(errorCode)) {
dataErrorCode=errorCode;
udata_close(data);
return haveNormData=-1;
}
/* in the mutex block, set the data for this process */
umtx_lock(NULL);
if(normData==NULL) {
normData=data;
data=NULL;
uprv_memcpy(&indexes, p, sizeof(indexes));
uprv_memcpy(&normTrie, &_normTrie, sizeof(UTrie));
uprv_memcpy(&fcdTrie, &_fcdTrie, sizeof(UTrie));
uprv_memcpy(&auxTrie, &_auxTrie, sizeof(UTrie));
} else {
p=(const int32_t *)udata_getMemory(normData);
}
umtx_unlock(NULL);
/* initialize some variables */
extraData=(uint16_t *)((uint8_t *)(p+_NORM_INDEX_TOP)+indexes[_NORM_INDEX_TRIE_SIZE]);
combiningTable=extraData+indexes[_NORM_INDEX_UCHAR_COUNT];
formatVersion_2_1=formatVersion[0]>2 || (formatVersion[0]==2 && formatVersion[1]>=1);
formatVersion_2_2=formatVersion[0]>2 || (formatVersion[0]==2 && formatVersion[1]>=2);
if(formatVersion_2_1) {
canonStartSets=combiningTable+
indexes[_NORM_INDEX_COMBINE_DATA_COUNT]+
(indexes[_NORM_INDEX_FCD_TRIE_SIZE]+indexes[_NORM_INDEX_AUX_TRIE_SIZE])/2;
}
haveNormData=1;
/* if a different thread set it first, then close the extra data */
if(data!=NULL) {
udata_close(data); /* NULL if it was set correctly */
}
}
return haveNormData;
}
static inline UBool
_haveData(UErrorCode &errorCode) {
if(haveNormData!=0) {
errorCode=dataErrorCode;
return (UBool)(haveNormData>0);
} else {
return (UBool)(loadNormData(errorCode)>0);
}
}
U_CAPI UBool U_EXPORT2
unorm_haveData(UErrorCode *pErrorCode) {
return _haveData(*pErrorCode);
}
U_CAPI const uint16_t * U_EXPORT2
unorm_getFCDTrie(UErrorCode *pErrorCode) {
if(_haveData(*pErrorCode)) {
return fcdTrie.index;
} else {
return NULL;
}
}
/* data access primitives --------------------------------------------------- */
static inline uint32_t
_getNorm32(UChar c) {
return UTRIE_GET32_FROM_LEAD(&normTrie, c);
}
static inline uint32_t
_getNorm32FromSurrogatePair(uint32_t norm32, UChar c2) {
/*
* the surrogate index in norm32 stores only the number of the surrogate index block
* see gennorm/store.c/getFoldedNormValue()
*/
norm32=
UTRIE_BMP_INDEX_LENGTH+
((norm32>>(_NORM_EXTRA_SHIFT-UTRIE_SURROGATE_BLOCK_BITS))&
(0x3ff<<UTRIE_SURROGATE_BLOCK_BITS));
return UTRIE_GET32_FROM_OFFSET_TRAIL(&normTrie, norm32, c2);
}
/*
* get a norm32 from text with complete code points
* (like from decompositions)
*/
static inline uint32_t
_getNorm32(const UChar *p, uint32_t mask) {
uint32_t norm32=_getNorm32(*p);
if((norm32&mask) && isNorm32LeadSurrogate(norm32)) {
/* *p is a lead surrogate, get the real norm32 */
norm32=_getNorm32FromSurrogatePair(norm32, *(p+1));
}
return norm32;
}
static inline uint16_t
_getFCD16(UChar c) {
return UTRIE_GET16_FROM_LEAD(&fcdTrie, c);
}
static inline uint16_t
_getFCD16FromSurrogatePair(uint16_t fcd16, UChar c2) {
/* the surrogate index in fcd16 is an absolute offset over the start of stage 1 */
return UTRIE_GET16_FROM_OFFSET_TRAIL(&fcdTrie, fcd16, c2);
}
static inline const uint16_t *
_getExtraData(uint32_t norm32) {
return extraData+(norm32>>_NORM_EXTRA_SHIFT);
}
/* normalization exclusion sets --------------------------------------------- */
/*
* Normalization exclusion UnicodeSets are used for tailored normalization;
* see the comment near the beginning of this file.
*
* By specifying one or several sets of code points,
* those code points become inert for normalization.
*/
static const UnicodeSet *
internalGetNXHangul(UErrorCode &errorCode) {
/* internal function, does not check for incoming U_FAILURE */
UBool isCached;
/* do this because double-checked locking is broken */
umtx_lock(NULL);
isCached=nxCache[UNORM_NX_HANGUL]!=NULL;
umtx_unlock(NULL);
if(!isCached) {
UnicodeSet *set=new UnicodeSet(0xac00, 0xd7a3);
if(set==NULL) {
errorCode=U_MEMORY_ALLOCATION_ERROR;
return NULL;
}
umtx_lock(NULL);
if(nxCache[UNORM_NX_HANGUL]==NULL) {
nxCache[UNORM_NX_HANGUL]=set;
set=NULL;
}
umtx_unlock(NULL);
delete set;
}
return nxCache[UNORM_NX_HANGUL];
}
static const UnicodeSet *
internalGetNXCJKCompat(UErrorCode &errorCode) {
/* internal function, does not check for incoming U_FAILURE */
UBool isCached;
/* do this because double-checked locking is broken */
umtx_lock(NULL);
isCached=nxCache[UNORM_NX_CJK_COMPAT]!=NULL;
umtx_unlock(NULL);
if(!isCached) {
/* build a set from [CJK Ideographs]&[has canonical decomposition] */
UnicodeSet *set, *hasDecomp;
set=new UnicodeSet(UNICODE_STRING("[:Ideographic:]", 15), errorCode);
if(set==NULL) {
errorCode=U_MEMORY_ALLOCATION_ERROR;
return NULL;
}
if(U_FAILURE(errorCode)) {
delete set;
return NULL;
}
/* start with an empty set for [has canonical decomposition] */
hasDecomp=new UnicodeSet();
if(hasDecomp==NULL) {
delete set;
errorCode=U_MEMORY_ALLOCATION_ERROR;
return NULL;
}
/* iterate over all ideographs and remember which canonically decompose */
UnicodeSetIterator it(*set);
UChar32 start, end;
uint32_t norm32;
while(it.nextRange() && !it.isString()) {
start=it.getCodepoint();
end=it.getCodepointEnd();
while(start<=end) {
UTRIE_GET32(&normTrie, start, norm32);
if(norm32&_NORM_QC_NFD) {
hasDecomp->add(start);
}
++start;
}
}
/* hasDecomp now contains all ideographs that decompose canonically */
umtx_lock(NULL);
if(nxCache[UNORM_NX_CJK_COMPAT]==NULL) {
nxCache[UNORM_NX_CJK_COMPAT]=hasDecomp;
hasDecomp=NULL;
}
umtx_unlock(NULL);
delete hasDecomp;
delete set;
}
return nxCache[UNORM_NX_CJK_COMPAT];
}
static const UnicodeSet *
internalGetNXUnicode(uint32_t options, UErrorCode &errorCode) {
/* internal function, does not check for incoming U_FAILURE */
options&=_NORM_OPTIONS_UNICODE_MASK;
if(options==0) {
return NULL;
}
UBool isCached;
/* do this because double-checked locking is broken */
umtx_lock(NULL);
isCached=nxCache[options]!=NULL;
umtx_unlock(NULL);
if(!isCached) {
/* build a set with all code points that were not designated by the specified Unicode version */
UnicodeSet *set;
switch(options) {
case UNORM_UNICODE_3_2:
set=new UnicodeSet(UNICODE_STRING("[:^Age=3.2:]", 12), errorCode);
break;
default:
errorCode=U_ILLEGAL_ARGUMENT_ERROR;
return NULL;
}
if(set==NULL) {
errorCode=U_MEMORY_ALLOCATION_ERROR;
return NULL;
}
if(U_FAILURE(errorCode)) {
delete set;
return NULL;
}
umtx_lock(NULL);
if(nxCache[options]==NULL) {
nxCache[options]=set;
set=NULL;
}
umtx_unlock(NULL);
delete set;
}
return nxCache[options];
}
/* Get a decomposition exclusion set. The data must be loaded. */
static const UnicodeSet *
internalGetNX(int32_t options, UErrorCode &errorCode) {
options&=_NORM_OPTIONS_SETS_MASK;
UBool isCached;
/* do this because double-checked locking is broken */
umtx_lock(NULL);
isCached=nxCache[options]!=NULL;
umtx_unlock(NULL);
if(!isCached) {
/* return basic sets */
if(options==UNORM_NX_HANGUL) {
return internalGetNXHangul(errorCode);
}
if(options==UNORM_NX_CJK_COMPAT) {
return internalGetNXCJKCompat(errorCode);
}
if((options&_NORM_OPTIONS_UNICODE_MASK)!=0 && (options&_NORM_OPTIONS_NX_MASK)==0) {
return internalGetNXUnicode(options, errorCode);
}
/* build a set from multiple subsets */
UnicodeSet *set;
const UnicodeSet *other;
set=new UnicodeSet();
if(set==NULL) {
errorCode=U_MEMORY_ALLOCATION_ERROR;
return NULL;
}
if((options&UNORM_NX_HANGUL)!=0 && NULL!=(other=internalGetNXHangul(errorCode))) {
set->addAll(*other);
}
if((options&UNORM_NX_CJK_COMPAT)!=0 && NULL!=(other=internalGetNXCJKCompat(errorCode))) {
set->addAll(*other);
}
if((options&_NORM_OPTIONS_UNICODE_MASK)!=0 && NULL!=(other=internalGetNXUnicode(options, errorCode))) {
set->addAll(*other);
}
if(U_FAILURE(errorCode)) {
delete set;
return NULL;
}
umtx_lock(NULL);
if(nxCache[options]==NULL) {
nxCache[options]=set;
set=NULL;
}
umtx_unlock(NULL);
delete set;
}
return nxCache[options];
}
static inline const UnicodeSet *
getNX(int32_t options, UErrorCode &errorCode) {
if(U_FAILURE(errorCode) || (options&=_NORM_OPTIONS_SETS_MASK)==0) {
/* incoming failure, or no decomposition exclusions requested */
return NULL;
} else {
return internalGetNX(options, errorCode);
}
}
static inline UBool
nx_contains(const UnicodeSet *nx, UChar32 c) {
return nx!=NULL && nx->contains(c);
}
static inline UBool
nx_contains(const UnicodeSet *nx, UChar c, UChar c2) {
return nx!=NULL && nx->contains(c2==0 ? c : U16_GET_SUPPLEMENTARY(c, c2));
}
/* other normalization primitives ------------------------------------------- */
/* get the canonical or compatibility decomposition for one character */
static inline const UChar *
_decompose(uint32_t norm32, uint32_t qcMask, int32_t &length,
uint8_t &cc, uint8_t &trailCC) {
const UChar *p=(const UChar *)_getExtraData(norm32);
length=*p++;
if((norm32&qcMask&_NORM_QC_NFKD)!=0 && length>=0x100) {
/* use compatibility decomposition, skip canonical data */
p+=((length>>7)&1)+(length&_NORM_DECOMP_LENGTH_MASK);
length>>=8;
}
if(length&_NORM_DECOMP_FLAG_LENGTH_HAS_CC) {
/* get the lead and trail cc's */
UChar bothCCs=*p++;
cc=(uint8_t)(bothCCs>>8);
trailCC=(uint8_t)bothCCs;
} else {
/* lead and trail cc's are both 0 */
cc=trailCC=0;
}
length&=_NORM_DECOMP_LENGTH_MASK;
return p;
}
/* get the canonical decomposition for one character */
static inline const UChar *
_decompose(uint32_t norm32, int32_t &length,
uint8_t &cc, uint8_t &trailCC) {
const UChar *p=(const UChar *)_getExtraData(norm32);
length=*p++;
if(length&_NORM_DECOMP_FLAG_LENGTH_HAS_CC) {
/* get the lead and trail cc's */
UChar bothCCs=*p++;
cc=(uint8_t)(bothCCs>>8);
trailCC=(uint8_t)bothCCs;
} else {
/* lead and trail cc's are both 0 */
cc=trailCC=0;
}
length&=_NORM_DECOMP_LENGTH_MASK;
return p;
}
/**
* Get the canonical decomposition for one code point.
* @param c code point
* @param buffer out-only buffer for algorithmic decompositions of Hangul
* @param length out-only, takes the length of the decomposition, if any
* @return pointer to decomposition, or 0 if none
* @internal
*/
static const UChar *
_decompose(UChar32 c, UChar buffer[4], int32_t &length) {
uint32_t norm32;
UTRIE_GET32(&normTrie, c, norm32);
if(norm32&_NORM_QC_NFD) {
if(isNorm32HangulOrJamo(norm32)) {
/* Hangul syllable: decompose algorithmically */
UChar c2;
c-=HANGUL_BASE;
c2=(UChar)(c%JAMO_T_COUNT);
c/=JAMO_T_COUNT;
if(c2>0) {
buffer[2]=(UChar)(JAMO_T_BASE+c2);
length=3;
} else {
length=2;
}
buffer[1]=(UChar)(JAMO_V_BASE+c%JAMO_V_COUNT);
buffer[0]=(UChar)(JAMO_L_BASE+c/JAMO_V_COUNT);
return buffer;
} else {
/* normal decomposition */
uint8_t cc, trailCC;
return _decompose(norm32, length, cc, trailCC);
}
} else {
return 0;
}
}
/*
* get the combining class of (c, c2)=*p++
* before: p<limit after: p<=limit
* if only one code unit is used, then c2==0
*/
static inline uint8_t
_getNextCC(const UChar *&p, const UChar *limit, UChar &c, UChar &c2) {
uint32_t norm32;
c=*p++;
norm32=_getNorm32(c);
if((norm32&_NORM_CC_MASK)==0) {
c2=0;
return 0;
} else {
if(!isNorm32LeadSurrogate(norm32)) {
c2=0;
} else {
/* c is a lead surrogate, get the real norm32 */
if(p!=limit && UTF_IS_SECOND_SURROGATE(c2=*p)) {
++p;
norm32=_getNorm32FromSurrogatePair(norm32, c2);
} else {
c2=0;
return 0;
}
}
return (uint8_t)(norm32>>_NORM_CC_SHIFT);
}
}
/*
* read backwards and get norm32
* return 0 if the character is <minC
* if c2!=0 then (c2, c) is a surrogate pair (reversed - c2 is first surrogate but read second!)
*/
static inline uint32_t
_getPrevNorm32(const UChar *start, const UChar *&src,
uint32_t minC, uint32_t mask,
UChar &c, UChar &c2) {
uint32_t norm32;
c=*--src;
c2=0;
/* check for a surrogate before getting norm32 to see if we need to predecrement further */
if(c<minC) {
return 0;
} else if(!UTF_IS_SURROGATE(c)) {
return _getNorm32(c);
} else if(UTF_IS_SURROGATE_FIRST(c)) {
/* unpaired first surrogate */
return 0;
} else if(src!=start && UTF_IS_FIRST_SURROGATE(c2=*(src-1))) {
--src;
norm32=_getNorm32(c2);
if((norm32&mask)==0) {
/* all surrogate pairs with this lead surrogate have only irrelevant data */
return 0;
} else {
/* norm32 must be a surrogate special */
return _getNorm32FromSurrogatePair(norm32, c);
}
} else {
/* unpaired second surrogate */
c2=0;
return 0;
}
}
/*
* get the combining class of (c, c2)=*--p
* before: start<p after: start<=p
*/
static inline uint8_t
_getPrevCC(const UChar *start, const UChar *&p) {
UChar c, c2;
return (uint8_t)(_getPrevNorm32(start, p, _NORM_MIN_WITH_LEAD_CC, _NORM_CC_MASK, c, c2)>>_NORM_CC_SHIFT);
}
/*
* is this a safe boundary character for NF*D?
* (lead cc==0)
*/
static inline UBool
_isNFDSafe(uint32_t norm32, uint32_t ccOrQCMask, uint32_t decompQCMask) {
if((norm32&ccOrQCMask)==0) {
return TRUE; /* cc==0 and no decomposition: this is NF*D safe */
}
/* inspect its decomposition - maybe a Hangul but not a surrogate here */
if(isNorm32Regular(norm32) && (norm32&decompQCMask)!=0) {
int32_t length;
uint8_t cc, trailCC;
/* decomposes, get everything from the variable-length extra data */
_decompose(norm32, decompQCMask, length, cc, trailCC);
return cc==0;
} else {
/* no decomposition (or Hangul), test the cc directly */
return (norm32&_NORM_CC_MASK)==0;
}
}
/*
* is this (or does its decomposition begin with) a "true starter"?
* (cc==0 and NF*C_YES)
*/
static inline UBool
_isTrueStarter(uint32_t norm32, uint32_t ccOrQCMask, uint32_t decompQCMask) {
if((norm32&ccOrQCMask)==0) {
return TRUE; /* this is a true starter (could be Hangul or Jamo L) */
}
/* inspect its decomposition - not a Hangul or a surrogate here */
if((norm32&decompQCMask)!=0) {
const UChar *p;
int32_t length;
uint8_t cc, trailCC;
/* decomposes, get everything from the variable-length extra data */
p=_decompose(norm32, decompQCMask, length, cc, trailCC);
if(cc==0) {
uint32_t qcMask=ccOrQCMask&_NORM_QC_MASK;
/* does it begin with NFC_YES? */
if((_getNorm32(p, qcMask)&qcMask)==0) {
/* yes, the decomposition begins with a true starter */
return TRUE;
}
}
}
return FALSE;
}
/* uchar.h */
U_CAPI uint8_t U_EXPORT2
u_getCombiningClass(UChar32 c) {
UErrorCode errorCode=U_ZERO_ERROR;
if(_haveData(errorCode)) {
uint32_t norm32;
UTRIE_GET32(&normTrie, c, norm32);
return (uint8_t)(norm32>>_NORM_CC_SHIFT);
} else {
return 0;
}
}
U_CAPI UBool U_EXPORT2
unorm_internalIsFullCompositionExclusion(UChar32 c) {
UErrorCode errorCode=U_ZERO_ERROR;
if(_haveData(errorCode) && formatVersion_2_1) {
uint16_t aux;
UTRIE_GET16(&auxTrie, c, aux);
return (UBool)((aux&_NORM_AUX_COMP_EX_MASK)!=0);
} else {
return FALSE;
}
}
U_CAPI UBool U_EXPORT2
unorm_isCanonSafeStart(UChar32 c) {
UErrorCode errorCode=U_ZERO_ERROR;
if(_haveData(errorCode) && formatVersion_2_1) {
uint16_t aux;
UTRIE_GET16(&auxTrie, c, aux);
return (UBool)((aux&_NORM_AUX_UNSAFE_MASK)==0);
} else {
return FALSE;
}
}
U_CAPI UBool U_EXPORT2
unorm_getCanonStartSet(UChar32 c, USerializedSet *fillSet) {
UErrorCode errorCode=U_ZERO_ERROR;
if( fillSet!=NULL && (uint32_t)c<=0x10ffff &&
_haveData(errorCode) && canonStartSets!=NULL
) {
const uint16_t *table;
int32_t i, start, limit;
/*
* binary search for c
*
* There are two search tables,
* one for BMP code points and one for supplementary ones.
* See unormimp.h for details.
*/
if(c<=0xffff) {
table=canonStartSets+canonStartSets[_NORM_SET_INDEX_CANON_SETS_LENGTH];
start=0;
limit=canonStartSets[_NORM_SET_INDEX_CANON_BMP_TABLE_LENGTH];
/* each entry is a pair { c, result } */
while(start<limit-2) {
i=(uint16_t)(((start+limit)/4)*2); /* (start+limit)/2 and address pairs */
if(c<table[i]) {
limit=i;
} else {
start=i;
}
}
/* found? */
if(c==table[start]) {
i=table[start+1];
if((i&_NORM_CANON_SET_BMP_MASK)==_NORM_CANON_SET_BMP_IS_INDEX) {
/* result 01xxxxxx xxxxxx contains index x to a USerializedSet */
i&=(_NORM_MAX_CANON_SETS-1);
return uset_getSerializedSet(fillSet,
canonStartSets+i,
canonStartSets[_NORM_SET_INDEX_CANON_SETS_LENGTH]-i);
} else {
/* other result values are BMP code points for single-code point sets */
uset_setSerializedToOne(fillSet, (UChar32)i);
return TRUE;
}
}
} else {
uint16_t high, low, h;
table=canonStartSets+canonStartSets[_NORM_SET_INDEX_CANON_SETS_LENGTH]+
canonStartSets[_NORM_SET_INDEX_CANON_BMP_TABLE_LENGTH];
start=0;
limit=canonStartSets[_NORM_SET_INDEX_CANON_SUPP_TABLE_LENGTH];
high=(uint16_t)(c>>16);
low=(uint16_t)c;
/* each entry is a triplet { high(c), low(c), result } */
while(start<limit-3) {
i=(uint16_t)(((start+limit)/6)*3); /* (start+limit)/2 and address triplets */
h=table[i]&0x1f; /* high word */
if(high<h || (high==h && low<table[i+1])) {
limit=i;
} else {
start=i;
}
}
/* found? */
h=table[start];
if(high==(h&0x1f) && low==table[start+1]) {
i=table[start+2];
if((h&0x8000)==0) {
/* the result is an index to a USerializedSet */
return uset_getSerializedSet(fillSet,
canonStartSets+i,
canonStartSets[_NORM_SET_INDEX_CANON_SETS_LENGTH]-i);
} else {
/*
* single-code point set {x} in
* triplet { 100xxxxx 000hhhhh llllllll llllllll xxxxxxxx xxxxxxxx }
*/
i|=((int32_t)h&0x1f00)<<8; /* add high bits from high(c) */
uset_setSerializedToOne(fillSet, (UChar32)i);
return TRUE;
}
}
}
}
return FALSE; /* not found */
}
U_CAPI int32_t U_EXPORT2
u_getFC_NFKC_Closure(UChar32 c, UChar *dest, int32_t destCapacity, UErrorCode *pErrorCode) {
uint16_t aux;
if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
return 0;
}
if(destCapacity<0 || (dest==NULL && destCapacity>0)) {
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
if(!_haveData(*pErrorCode) || !formatVersion_2_1) {
return 0;
}
UTRIE_GET16(&auxTrie, c, aux);
aux&=_NORM_AUX_FNC_MASK;
if(aux!=0) {
const UChar *s;
int32_t length;
s=(const UChar *)(extraData+aux);
if(*s<0xff00) {
/* s points to the single-unit string */
length=1;
} else {
length=*s&0xff;
++s;
}
if(0<length && length<=destCapacity) {
uprv_memcpy(dest, s, length*U_SIZEOF_UCHAR);
}
return u_terminateUChars(dest, destCapacity, length, pErrorCode);
} else {
return u_terminateUChars(dest, destCapacity, 0, pErrorCode);
}
}
/* Is c an NF<mode>-skippable code point? See unormimp.h. */
U_CAPI UBool U_EXPORT2
unorm_isNFSkippable(UChar32 c, UNormalizationMode mode) {
UErrorCode errorCode;
uint32_t norm32, mask;
uint16_t aux, fcd;
errorCode=U_ZERO_ERROR;
if(!_haveData(errorCode)) {
return FALSE;
}
/* handle trivial cases; set the comparison mask for the normal ones */
switch(mode) {
case UNORM_NONE:
return TRUE;
case UNORM_NFD:
mask=_NORM_CC_MASK|_NORM_QC_NFD;
break;
case UNORM_NFKD:
mask=_NORM_CC_MASK|_NORM_QC_NFKD;
break;
case UNORM_NFC:
/* case UNORM_FCC: */
mask=_NORM_CC_MASK|_NORM_COMBINES_ANY|(_NORM_QC_NFC&_NORM_QC_ANY_NO);
break;
case UNORM_NFKC:
mask=_NORM_CC_MASK|_NORM_COMBINES_ANY|(_NORM_QC_NFKC&_NORM_QC_ANY_NO);
break;
case UNORM_FCD:
/* FCD: skippable if lead cc==0 and trail cc<=1 */
UTRIE_GET16(&fcdTrie, c, fcd);
return fcd<=1;
default:
return FALSE;
}
/* check conditions (a)..(e), see unormimp.h */
UTRIE_GET32(&normTrie, c, norm32);
if((norm32&mask)!=0) {
return FALSE; /* fails (a)..(e), not skippable */
}
if(mode<UNORM_NFC) {
return TRUE; /* NF*D, passed (a)..(c), is skippable */
}
/* NF*C/FCC, passed (a)..(e) */
if((norm32&_NORM_QC_NFD)==0) {
return TRUE; /* no canonical decomposition, is skippable */
}
/* check Hangul syllables algorithmically */
if(isNorm32HangulOrJamo(norm32)) {
/* Jamo passed (a)..(e) above, must be Hangul */
return !isHangulWithoutJamoT((UChar)c); /* LVT are skippable, LV are not */
}
/* if(mode<=UNORM_NFKC) { -- enable when implementing FCC */
/* NF*C, test (f) flag */
if(!formatVersion_2_2) {
return FALSE; /* no (f) data, say not skippable to be safe */
}
UTRIE_GET16(&auxTrie, c, aux);
return (aux&_NORM_AUX_NFC_SKIP_F_MASK)==0; /* TRUE=skippable if the (f) flag is not set */
/* } else { FCC, test fcd<=1 instead of the above } */
}
U_CAPI void U_EXPORT2
unorm_addPropertyStarts(USet *set, UErrorCode *pErrorCode) {
UChar c;
if(!_haveData(*pErrorCode)) {
return;
}
/* add the start code point of each same-value range of each trie */
utrie_enum(&normTrie, NULL, _enumPropertyStartsRange, set);
utrie_enum(&fcdTrie, NULL, _enumPropertyStartsRange, set);
if(formatVersion_2_1) {
utrie_enum(&auxTrie, NULL, _enumPropertyStartsRange, set);
}
/* add Hangul LV syllables and LV+1 because of skippables */
for(c=HANGUL_BASE; c<HANGUL_BASE+HANGUL_COUNT; c+=JAMO_T_COUNT) {
uset_add(set, c);
uset_add(set, c+1);
}
uset_add(set, HANGUL_BASE+HANGUL_COUNT); /* add Hangul+1 to continue with other properties */
}
/* reorder UTF-16 in-place -------------------------------------------------- */
/*
* simpler, single-character version of _mergeOrdered() -
* bubble-insert one single code point into the preceding string
* which is already canonically ordered
* (c, c2) may or may not yet have been inserted at [current..p[
*
* it must be p=current+lengthof(c, c2) i.e. p=current+(c2==0 ? 1 : 2)
*
* before: [start..current[ is already ordered, and
* [current..p[ may or may not hold (c, c2) but
* must be exactly the same length as (c, c2)
* after: [start..p[ is ordered
*
* returns the trailing combining class
*/
static uint8_t
_insertOrdered(const UChar *start, UChar *current, UChar *p,
UChar c, UChar c2, uint8_t cc) {
const UChar *pBack, *pPreBack;
UChar *r;
uint8_t prevCC, trailCC=cc;
if(start<current && cc!=0) {
/* search for the insertion point where cc>=prevCC */
pPreBack=pBack=current;
prevCC=_getPrevCC(start, pPreBack);
if(cc<prevCC) {
/* this will be the last code point, so keep its cc */
trailCC=prevCC;
pBack=pPreBack;
while(start<pPreBack) {
prevCC=_getPrevCC(start, pPreBack);
if(cc>=prevCC) {
break;
}
pBack=pPreBack;
}
/*
* this is where we are right now with all these pointers:
* [start..pPreBack[ 0..? code points that we can ignore
* [pPreBack..pBack[ 0..1 code points with prevCC<=cc
* [pBack..current[ 0..n code points with >cc, move up to insert (c, c2)
* [current..p[ 1 code point (c, c2) with cc
*/
/* move the code units in between up */
r=p;
do {
*--r=*--current;
} while(pBack!=current);
}
}
/* insert (c, c2) */
*current=c;
if(c2!=0) {
*(current+1)=c2;
}
/* we know the cc of the last code point */
return trailCC;
}
/*
* merge two UTF-16 string parts together
* to canonically order (order by combining classes) their concatenation
*
* the two strings may already be adjacent, so that the merging is done in-place
* if the two strings are not adjacent, then the buffer holding the first one
* must be large enough
* the second string may or may not be ordered in itself
*
* before: [start..current[ is already ordered, and
* [next..limit[ may be ordered in itself, but
* is not in relation to [start..current[
* after: [start..current+(limit-next)[ is ordered
*
* the algorithm is a simple bubble-sort that takes the characters from *next++
* and inserts them in correct combining class order into the preceding part
* of the string
*
* since this function is called much less often than the single-code point
* _insertOrdered(), it just uses that for easier maintenance
* (see file version from before 2001aug31 for a more optimized version)
*
* returns the trailing combining class
*/
static uint8_t
_mergeOrdered(UChar *start, UChar *current,
const UChar *next, const UChar *limit, UBool isOrdered=TRUE) {
UChar *r;
UChar c, c2;
uint8_t cc, trailCC=0;
UBool adjacent;
adjacent= current==next;
if(start!=current || !isOrdered) {
while(next<limit) {
cc=_getNextCC(next, limit, c, c2);
if(cc==0) {
/* does not bubble back */
trailCC=0;
if(adjacent) {
current=(UChar *)next;
} else {
*current++=c;
if(c2!=0) {
*current++=c2;
}
}
if(isOrdered) {
break;
} else {
start=current;
}
} else {
r=current+(c2==0 ? 1 : 2);
trailCC=_insertOrdered(start, current, r, c, c2, cc);
current=r;
}
}
}
if(next==limit) {
/* we know the cc of the last code point */
return trailCC;
} else {
if(!adjacent) {
/* copy the second string part */
do {
*current++=*next++;
} while(next!=limit);
limit=current;
}
return _getPrevCC(start, limit);
}
}
/* find the last true starter in [start..src[ and return the pointer to it */
static const UChar *
_findPreviousStarter(const UChar *start, const UChar *src,
uint32_t ccOrQCMask, uint32_t decompQCMask, UChar minNoMaybe) {
uint32_t norm32;
UChar c, c2;
while(start<src) {
norm32=_getPrevNorm32(start, src, minNoMaybe, ccOrQCMask|decompQCMask, c, c2);
if(_isTrueStarter(norm32, ccOrQCMask, decompQCMask)) {
break;
}
}
return src;
}
/* find the first true starter in [src..limit[ and return the pointer to it */
static const UChar *
_findNextStarter(const UChar *src, const UChar *limit,
uint32_t qcMask, uint32_t decompQCMask, UChar minNoMaybe) {
const UChar *p;
uint32_t norm32, ccOrQCMask;
int32_t length;
UChar c, c2;
uint8_t cc, trailCC;
ccOrQCMask=_NORM_CC_MASK|qcMask;
for(;;) {
if(src==limit) {
break; /* end of string */
}
c=*src;
if(c<minNoMaybe) {
break; /* catches NUL terminater, too */
}
norm32=_getNorm32(c);
if((norm32&ccOrQCMask)==0) {
break; /* true starter */
}
if(isNorm32LeadSurrogate(norm32)) {
/* c is a lead surrogate, get the real norm32 */
if((src+1)==limit || !UTF_IS_SECOND_SURROGATE(c2=*(src+1))) {
break; /* unmatched first surrogate: counts as a true starter */
}
norm32=_getNorm32FromSurrogatePair(norm32, c2);
if((norm32&ccOrQCMask)==0) {
break; /* true starter */
}
} else {
c2=0;
}
/* (c, c2) is not a true starter but its decomposition may be */
if(norm32&decompQCMask) {
/* (c, c2) decomposes, get everything from the variable-length extra data */
p=_decompose(norm32, decompQCMask, length, cc, trailCC);
/* get the first character's norm32 to check if it is a true starter */
if(cc==0 && (_getNorm32(p, qcMask)&qcMask)==0) {
break; /* true starter */
}
}
src+= c2==0 ? 1 : 2; /* not a true starter, continue */
}
return src;
}
/* make NFD & NFKD ---------------------------------------------------------- */
U_CAPI int32_t U_EXPORT2
unorm_getDecomposition(UChar32 c, UBool compat,
UChar *dest, int32_t destCapacity) {
UErrorCode errorCode=U_ZERO_ERROR;
if( (uint32_t)c<=0x10ffff &&
_haveData(errorCode) &&
((dest!=NULL && destCapacity>0) || destCapacity==0)
) {
uint32_t norm32, qcMask;
UChar32 minNoMaybe;
int32_t length;
/* initialize */
if(!compat) {
minNoMaybe=(UChar32)indexes[_NORM_INDEX_MIN_NFD_NO_MAYBE];
qcMask=_NORM_QC_NFD;
} else {
minNoMaybe=(UChar32)indexes[_NORM_INDEX_MIN_NFKD_NO_MAYBE];
qcMask=_NORM_QC_NFKD;
}
if(c<minNoMaybe) {
/* trivial case */
if(destCapacity>0) {
dest[0]=(UChar)c;
}
return -1;
}
/* data lookup */
UTRIE_GET32(&normTrie, c, norm32);
if((norm32&qcMask)==0) {
/* simple case: no decomposition */
if(c<=0xffff) {
if(destCapacity>0) {
dest[0]=(UChar)c;
}
return -1;
} else {
if(destCapacity>=2) {
dest[0]=UTF16_LEAD(c);
dest[1]=UTF16_TRAIL(c);
}
return -2;
}
} else if(isNorm32HangulOrJamo(norm32)) {
/* Hangul syllable: decompose algorithmically */
UChar c2;
c-=HANGUL_BASE;
c2=(UChar)(c%JAMO_T_COUNT);
c/=JAMO_T_COUNT;
if(c2>0) {
if(destCapacity>=3) {
dest[2]=(UChar)(JAMO_T_BASE+c2);
}
length=3;
} else {
length=2;
}
if(destCapacity>=2) {
dest[1]=(UChar)(JAMO_V_BASE+c%JAMO_V_COUNT);
dest[0]=(UChar)(JAMO_L_BASE+c/JAMO_V_COUNT);
}
return length;
} else {
/* c decomposes, get everything from the variable-length extra data */
const UChar *p, *limit;
uint8_t cc, trailCC;
p=_decompose(norm32, qcMask, length, cc, trailCC);
if(length<=destCapacity) {
limit=p+length;
do {
*dest++=*p++;
} while(p<limit);
}
return length;
}
} else {
return 0;
}
}
static int32_t
_decompose(UChar *dest, int32_t destCapacity,
const UChar *src, int32_t srcLength,
UBool compat, const UnicodeSet *nx,
uint8_t &outTrailCC) {
UChar buffer[3];
const UChar *limit, *prevSrc, *p;
uint32_t norm32, ccOrQCMask, qcMask;
int32_t destIndex, reorderStartIndex, length;
UChar c, c2, minNoMaybe;
uint8_t cc, prevCC, trailCC;
if(!compat) {
minNoMaybe=(UChar)indexes[_NORM_INDEX_MIN_NFD_NO_MAYBE];
qcMask=_NORM_QC_NFD;
} else {
minNoMaybe=(UChar)indexes[_NORM_INDEX_MIN_NFKD_NO_MAYBE];
qcMask=_NORM_QC_NFKD;
}
/* initialize */
ccOrQCMask=_NORM_CC_MASK|qcMask;
destIndex=reorderStartIndex=0;
prevCC=0;
/* avoid compiler warnings */
norm32=0;
c=0;
if(srcLength>=0) {
/* string with length */
limit=src+srcLength;
} else /* srcLength==-1 */ {
/* zero-terminated string */
limit=NULL;
}
U_ALIGN_CODE(16);
for(;;) {
/* count code units below the minimum or with irrelevant data for the quick check */
prevSrc=src;
if(limit==NULL) {
while((c=*src)<minNoMaybe ? c!=0 : ((norm32=_getNorm32(c))&ccOrQCMask)==0) {
prevCC=0;
++src;
}
} else {
while(src!=limit && ((c=*src)<minNoMaybe || ((norm32=_getNorm32(c))&ccOrQCMask)==0)) {
prevCC=0;
++src;
}
}
/* copy these code units all at once */
if(src!=prevSrc) {
length=(int32_t)(src-prevSrc);
if((destIndex+length)<=destCapacity) {
uprv_memcpy(dest+destIndex, prevSrc, length*U_SIZEOF_UCHAR);
}
destIndex+=length;
reorderStartIndex=destIndex;
}
/* end of source reached? */
if(limit==NULL ? c==0 : src==limit) {
break;
}
/* c already contains *src and norm32 is set for it, increment src */
++src;
/* check one above-minimum, relevant code unit */
/*
* generally, set p and length to the decomposition string
* in simple cases, p==NULL and (c, c2) will hold the length code units to append
* in all cases, set cc to the lead and trailCC to the trail combining class
*
* the following merge-sort of the current character into the preceding,
* canonically ordered result text will use the optimized _insertOrdered()
* if there is only one single code point to process;
* this is indicated with p==NULL, and (c, c2) is the character to insert
* ((c, 0) for a BMP character and (lead surrogate, trail surrogate)
* for a supplementary character)
* otherwise, p[length] is merged in with _mergeOrdered()
*/
if(isNorm32HangulOrJamo(norm32)) {
if(nx_contains(nx, c)) {
c2=0;
p=NULL;
length=1;
} else {
/* Hangul syllable: decompose algorithmically */
p=buffer;
cc=trailCC=0;
c-=HANGUL_BASE;
c2=(UChar)(c%JAMO_T_COUNT);
c/=JAMO_T_COUNT;
if(c2>0) {
buffer[2]=(UChar)(JAMO_T_BASE+c2);
length=3;
} else {
length=2;
}
buffer[1]=(UChar)(JAMO_V_BASE+c%JAMO_V_COUNT);
buffer[0]=(UChar)(JAMO_L_BASE+c/JAMO_V_COUNT);
}
} else {
if(isNorm32Regular(norm32)) {
c2=0;
length=1;
} else {
/* c is a lead surrogate, get the real norm32 */
if(src!=limit && UTF_IS_SECOND_SURROGATE(c2=*src)) {
++src;
length=2;
norm32=_getNorm32FromSurrogatePair(norm32, c2);
} else {
c2=0;
length=1;
norm32=0;
}
}
/* get the decomposition and the lead and trail cc's */
if(nx_contains(nx, c, c2)) {
/* excluded: norm32==0 */
cc=trailCC=0;
p=NULL;
} else if((norm32&qcMask)==0) {
/* c does not decompose */
cc=trailCC=(uint8_t)(norm32>>_NORM_CC_SHIFT);
p=NULL;
} else {
/* c decomposes, get everything from the variable-length extra data */
p=_decompose(norm32, qcMask, length, cc, trailCC);
if(length==1) {
/* fastpath a single code unit from decomposition */
c=*p;
c2=0;
p=NULL;
}
}
}
/* append the decomposition to the destination buffer, assume length>0 */
if((destIndex+length)<=destCapacity) {
UChar *reorderSplit=dest+destIndex;
if(p==NULL) {
/* fastpath: single code point */
if(cc!=0 && cc<prevCC) {
/* (c, c2) is out of order with respect to the preceding text */
destIndex+=length;
trailCC=_insertOrdered(dest+reorderStartIndex, reorderSplit, dest+destIndex, c, c2, cc);
} else {
/* just append (c, c2) */
dest[destIndex++]=c;
if(c2!=0) {
dest[destIndex++]=c2;
}
}
} else {
/* general: multiple code points (ordered by themselves) from decomposition */
if(cc!=0 && cc<prevCC) {
/* the decomposition is out of order with respect to the preceding text */
destIndex+=length;
trailCC=_mergeOrdered(dest+reorderStartIndex, reorderSplit, p, p+length);
} else {
/* just append the decomposition */
do {
dest[destIndex++]=*p++;
} while(--length>0);
}
}
} else {
/* buffer overflow */
/* keep incrementing the destIndex for preflighting */
destIndex+=length;
}
prevCC=trailCC;
if(prevCC==0) {
reorderStartIndex=destIndex;
}
}
outTrailCC=prevCC;
return destIndex;
}
U_CAPI int32_t U_EXPORT2
unorm_decompose(UChar *dest, int32_t destCapacity,
const UChar *src, int32_t srcLength,
UBool compat, int32_t options,
UErrorCode *pErrorCode) {
const UnicodeSet *nx;
int32_t destIndex;
uint8_t trailCC;
if(!_haveData(*pErrorCode)) {
return 0;
}
nx=getNX(options, *pErrorCode);
if(U_FAILURE(*pErrorCode)) {
return 0;
}
destIndex=_decompose(dest, destCapacity,
src, srcLength,
compat, nx,
trailCC);
return u_terminateUChars(dest, destCapacity, destIndex, pErrorCode);
}
/* make NFC & NFKC ---------------------------------------------------------- */
/* get the composition properties of the next character */
static inline uint32_t
_getNextCombining(UChar *&p, const UChar *limit,
UChar &c, UChar &c2,
uint16_t &combiningIndex, uint8_t &cc,
const UnicodeSet *nx) {
uint32_t norm32, combineFlags;
/* get properties */
c=*p++;
norm32=_getNorm32(c);
/* preset output values for most characters */
c2=0;
combiningIndex=0;
cc=0;
if((norm32&(_NORM_CC_MASK|_NORM_COMBINES_ANY))==0) {
return 0;
} else {
if(isNorm32Regular(norm32)) {
/* set cc etc. below */
} else if(isNorm32HangulOrJamo(norm32)) {
/* a compatibility decomposition contained Jamos */
combiningIndex=(uint16_t)(0xfff0|(norm32>>_NORM_EXTRA_SHIFT));
return norm32&_NORM_COMBINES_ANY;
} else {
/* c is a lead surrogate, get the real norm32 */
if(p!=limit && UTF_IS_SECOND_SURROGATE(c2=*p)) {
++p;
norm32=_getNorm32FromSurrogatePair(norm32, c2);
} else {
c2=0;
return 0;
}
}
if(nx_contains(nx, c, c2)) {
return 0; /* excluded: norm32==0 */
}
cc=(uint8_t)(norm32>>_NORM_CC_SHIFT);
combineFlags=norm32&_NORM_COMBINES_ANY;
if(combineFlags!=0) {
combiningIndex=*(_getExtraData(norm32)-1);
}
return combineFlags;
}
}
/*
* given a composition-result starter (c, c2) - which means its cc==0,
* it combines forward, it has extra data, its norm32!=0,
* it is not a Hangul or Jamo,
* get just its combineFwdIndex
*
* norm32(c) is special if and only if c2!=0
*/
static inline uint16_t
_getCombiningIndexFromStarter(UChar c, UChar c2) {
uint32_t norm32;
norm32=_getNorm32(c);
if(c2!=0) {
norm32=_getNorm32FromSurrogatePair(norm32, c2);
}
return *(_getExtraData(norm32)-1);
}
/*
* Find the recomposition result for
* a forward-combining character
* (specified with a pointer to its part of the combiningTable[])
* and a backward-combining character
* (specified with its combineBackIndex).
*
* If these two characters combine, then set (value, value2)
* with the code unit(s) of the composition character.
*
* Return value:
* 0 do not combine
* 1 combine
* >1 combine, and the composition is a forward-combining starter
*
* See unormimp.h for a description of the composition table format.
*/
static inline uint16_t
_combine(const uint16_t *table, uint16_t combineBackIndex,
uint16_t &value, uint16_t &value2) {
uint16_t key;
/* search in the starter's composition table */
for(;;) {
key=*table++;
if(key>=combineBackIndex) {
break;
}
table+= *table&0x8000 ? 2 : 1;
}
/* mask off bit 15, the last-entry-in-the-list flag */
if((key&0x7fff)==combineBackIndex) {
/* found! combine! */
value=*table;
/* is the composition a starter that combines forward? */
key=(uint16_t)((value&0x2000)+1);
/* get the composition result code point from the variable-length result value */
if(value&0x8000) {
if(value&0x4000) {
/* surrogate pair composition result */
value=(uint16_t)((value&0x3ff)|0xd800);
value2=*(table+1);
} else {
/* BMP composition result U+2000..U+ffff */
value=*(table+1);
value2=0;
}
} else {
/* BMP composition result U+0000..U+1fff */
value&=0x1fff;
value2=0;
}
return key;
} else {
/* not found */
return 0;
}
}
static inline UBool
_composeHangul(UChar prev, UChar c, uint32_t norm32, const UChar *&src, const UChar *limit,
UBool compat, UChar *dest, const UnicodeSet *nx) {
if(isJamoVTNorm32JamoV(norm32)) {
/* c is a Jamo V, compose with previous Jamo L and following Jamo T */
prev=(UChar)(prev-JAMO_L_BASE);
if(prev<JAMO_L_COUNT) {
c=(UChar)(HANGUL_BASE+(prev*JAMO_V_COUNT+(c-JAMO_V_BASE))*JAMO_T_COUNT);
/* check if the next character is a Jamo T (normal or compatibility) */
if(src!=limit) {
UChar next, t;
next=*src;
if((t=(UChar)(next-JAMO_T_BASE))<JAMO_T_COUNT) {
/* normal Jamo T */
++src;
c+=t;
} else if(compat) {
/* if NFKC, then check for compatibility Jamo T (BMP only) */
norm32=_getNorm32(next);
if(isNorm32Regular(norm32) && (norm32&_NORM_QC_NFKD)) {
const UChar *p;
int32_t length;
uint8_t cc, trailCC;
p=_decompose(norm32, _NORM_QC_NFKD, length, cc, trailCC);
if(length==1 && (t=(UChar)(*p-JAMO_T_BASE))<JAMO_T_COUNT) {
/* compatibility Jamo T */
++src;
c+=t;
}
}
}
}
if(nx_contains(nx, c)) {
if(!isHangulWithoutJamoT(c)) {
--src; /* undo ++src from reading the Jamo T */
}
return FALSE;
}
if(dest!=0) {
*dest=c;
}
return TRUE;
}
} else if(isHangulWithoutJamoT(prev)) {
/* c is a Jamo T, compose with previous Hangul LV that does not contain a Jamo T */
c=(UChar)(prev+(c-JAMO_T_BASE));
if(nx_contains(nx, c)) {
return FALSE;
}
if(dest!=0) {
*dest=c;
}
return TRUE;
}
return FALSE;
}
/*
* recompose the characters in [p..limit[
* (which is in NFD - decomposed and canonically ordered),
* adjust limit, and return the trailing cc
*
* since for NFKC we may get Jamos in decompositions, we need to
* recompose those too
*
* note that recomposition never lengthens the text:
* any character consists of either one or two code units;
* a composition may contain at most one more code unit than the original starter,
* while the combining mark that is removed has at least one code unit
*/
static uint8_t
_recompose(UChar *p, UChar *&limit, const UnicodeSet *nx) {
UChar *starter, *pRemove, *q, *r;
uint32_t combineFlags;
UChar c, c2;
uint16_t combineFwdIndex, combineBackIndex;
uint16_t result, value, value2;
uint8_t cc, prevCC;
UBool starterIsSupplementary;
starter=NULL; /* no starter */
combineFwdIndex=0; /* will not be used until starter!=NULL - avoid compiler warnings */
combineBackIndex=0; /* will always be set if combineFlags!=0 - avoid compiler warnings */
value=value2=0; /* always set by _combine() before used - avoid compiler warnings */
starterIsSupplementary=FALSE; /* will not be used until starter!=NULL - avoid compiler warnings */
prevCC=0;
for(;;) {
combineFlags=_getNextCombining(p, limit, c, c2, combineBackIndex, cc, nx);
if((combineFlags&_NORM_COMBINES_BACK) && starter!=NULL) {
if(combineBackIndex&0x8000) {
/* c is a Jamo V/T, see if we can compose it with the previous character */
pRemove=NULL; /* NULL while no Hangul composition */
c2=*starter;
if(combineBackIndex==0xfff2) {
/* Jamo V, compose with previous Jamo L and following Jamo T */
c2=(UChar)(c2-JAMO_L_BASE);
if(c2<JAMO_L_COUNT) {
pRemove=p-1;
c=(UChar)(HANGUL_BASE+(c2*JAMO_V_COUNT+(c-JAMO_V_BASE))*JAMO_T_COUNT);
if(p!=limit && (c2=(UChar)(*p-JAMO_T_BASE))<JAMO_T_COUNT) {
++p;
c+=c2;
}
if(!nx_contains(nx, c)) {
*starter=c;
} else {
/* excluded */
if(!isHangulWithoutJamoT(c)) {
--p; /* undo the ++p from reading the Jamo T */
}
/* c is modified but not used any more -- c=*(p-1); -- re-read the Jamo V/T */
pRemove=NULL;
}
}
#if 0
/*
* The following is disabled with #if 0 because it can not occur:
* Since the input is in NFD, there are no Hangul LV syllables that
* a Jamo T could combine with.
* All Jamo Ts are combined above when handling Jamo Vs.
*/
} else {
/* Jamo T, compose with previous Hangul that does not have a Jamo T */
if(isHangulWithoutJamoT(c2)) {
pRemove=p-1;
*starter=(UChar)(c2+(c-JAMO_T_BASE));
}
#endif
}
if(pRemove!=NULL) {
/* remove the Jamo(s) */
q=pRemove;
r=p;
while(r<limit) {
*q++=*r++;
}
p=pRemove;
limit=q;
}
c2=0; /* c2 held *starter temporarily */
/*
* now: cc==0 and the combining index does not include "forward" ->
* the rest of the loop body will reset starter to NULL;
* technically, a composed Hangul syllable is a starter, but it
* does not combine forward now that we have consumed all eligible Jamos;
* for Jamo V/T, combineFlags does not contain _NORM_COMBINES_FWD
*/
} else if(
/* the starter is not a Jamo V/T and */
!(combineFwdIndex&0x8000) &&
/* the combining mark is not blocked and */
(prevCC<cc || prevCC==0) &&
/* the starter and the combining mark (c, c2) do combine and */
0!=(result=_combine(combiningTable+combineFwdIndex, combineBackIndex, value, value2)) &&
/* the composition result is not excluded */
!nx_contains(nx, value, value2)
) {
/* replace the starter with the composition, remove the combining mark */
pRemove= c2==0 ? p-1 : p-2; /* pointer to the combining mark */
/* replace the starter with the composition */
*starter=(UChar)value;
if(starterIsSupplementary) {
if(value2!=0) {
/* both are supplementary */
*(starter+1)=(UChar)value2;
} else {
/* the composition is shorter than the starter, move the intermediate characters forward one */
starterIsSupplementary=FALSE;
q=starter+1;
r=q+1;
while(r<pRemove) {
*q++=*r++;
}
--pRemove;
}
} else if(value2!=0) {
/* the composition is longer than the starter, move the intermediate characters back one */
starterIsSupplementary=TRUE;
++starter; /* temporarily increment for the loop boundary */
q=pRemove;
r=++pRemove;
while(starter<q) {
*--r=*--q;
}
*starter=(UChar)value2;
--starter; /* undo the temporary increment */
/* } else { both are on the BMP, nothing more to do */
}
/* remove the combining mark by moving the following text over it */
if(pRemove<p) {
q=pRemove;
r=p;
while(r<limit) {
*q++=*r++;
}
p=pRemove;
limit=q;
}
/* keep prevCC because we removed the combining mark */
/* done? */
if(p==limit) {
return prevCC;
}
/* is the composition a starter that combines forward? */
if(result>1) {
combineFwdIndex=_getCombiningIndexFromStarter((UChar)value, (UChar)value2);
} else {
starter=NULL;
}
/* we combined and set prevCC, continue with looking for compositions */
continue;
}
}
/* no combination this time */
prevCC=cc;
if(p==limit) {
return prevCC;
}
/* if (c, c2) did not combine, then check if it is a starter */
if(cc==0) {
/* found a new starter; combineFlags==0 if (c, c2) is excluded */
if(combineFlags&_NORM_COMBINES_FWD) {
/* it may combine with something, prepare for it */
if(c2==0) {
starterIsSupplementary=FALSE;
starter=p-1;
} else {
starterIsSupplementary=TRUE;
starter=p-2;
}
combineFwdIndex=combineBackIndex;
} else {
/* it will not combine with anything */
starter=NULL;
}
}
}
}
/* decompose and recompose [prevStarter..src[ */
static const UChar *
_composePart(UChar *stackBuffer, UChar *&buffer, int32_t &bufferCapacity, int32_t &length,
const UChar *prevStarter, const UChar *src,
uint32_t qcMask, uint8_t &prevCC,
const UnicodeSet *nx,
UErrorCode *pErrorCode) {
UChar *recomposeLimit;
uint8_t trailCC;
UBool compat;
compat=(UBool)((qcMask&_NORM_QC_NFKC)!=0);
/* decompose [prevStarter..src[ */
length=_decompose(buffer, bufferCapacity,
prevStarter, src-prevStarter,
compat, nx,
trailCC);
if(length>bufferCapacity) {
if(!u_growBufferFromStatic(stackBuffer, &buffer, &bufferCapacity, 2*length, 0)) {
*pErrorCode=U_MEMORY_ALLOCATION_ERROR;
return NULL;
}
length=_decompose(buffer, bufferCapacity,
prevStarter, src-prevStarter,
compat, nx,
trailCC);
}
/* recompose the decomposition */
recomposeLimit=buffer+length;
if(length>=2) {
prevCC=_recompose(buffer, recomposeLimit, nx);
}
/* return with a pointer to the recomposition and its length */
length=recomposeLimit-buffer;
return buffer;
}
static int32_t
_compose(UChar *dest, int32_t destCapacity,
const UChar *src, int32_t srcLength,
UBool compat, const UnicodeSet *nx,
UErrorCode *pErrorCode) {
UChar stackBuffer[_STACK_BUFFER_CAPACITY];
UChar *buffer;
int32_t bufferCapacity;
const UChar *limit, *prevSrc, *prevStarter;
uint32_t norm32, ccOrQCMask, qcMask;
int32_t destIndex, reorderStartIndex, length;
UChar c, c2, minNoMaybe;
uint8_t cc, prevCC;
if(!compat) {
minNoMaybe=(UChar)indexes[_NORM_INDEX_MIN_NFC_NO_MAYBE];
qcMask=_NORM_QC_NFC;
} else {
minNoMaybe=(UChar)indexes[_NORM_INDEX_MIN_NFKC_NO_MAYBE];
qcMask=_NORM_QC_NFKC;
}
/* initialize */
buffer=stackBuffer;
bufferCapacity=_STACK_BUFFER_CAPACITY;
/*
* prevStarter points to the last character before the current one
* that is a "true" starter with cc==0 and quick check "yes".
*
* prevStarter will be used instead of looking for a true starter
* while incrementally decomposing [prevStarter..prevSrc[
* in _composePart(). Having a good prevStarter allows to just decompose
* the entire [prevStarter..prevSrc[.
*
* When _composePart() backs out from prevSrc back to prevStarter,
* then it also backs out destIndex by the same amount.
* Therefore, at all times, the (prevSrc-prevStarter) source units
* must correspond 1:1 to destination units counted with destIndex,
* except for reordering.
* This is true for the qc "yes" characters copied in the fast loop,
* and for pure reordering.
* prevStarter must be set forward to src when this is not true:
* In _composePart() and after composing a Hangul syllable.
*
* This mechanism relies on the assumption that the decomposition of a true starter
* also begins with a true starter. gennorm/store.c checks for this.
*/
prevStarter=src;
ccOrQCMask=_NORM_CC_MASK|qcMask;
destIndex=reorderStartIndex=0;
prevCC=0;
/* avoid compiler warnings */
norm32=0;
c=0;
if(srcLength>=0) {
/* string with length */
limit=src+srcLength;
} else /* srcLength==-1 */ {
/* zero-terminated string */
limit=NULL;
}
U_ALIGN_CODE(16);
for(;;) {
/* count code units below the minimum or with irrelevant data for the quick check */
prevSrc=src;
if(limit==NULL) {
while((c=*src)<minNoMaybe ? c!=0 : ((norm32=_getNorm32(c))&ccOrQCMask)==0) {
prevCC=0;
++src;
}
} else {
while(src!=limit && ((c=*src)<minNoMaybe || ((norm32=_getNorm32(c))&ccOrQCMask)==0)) {
prevCC=0;
++src;
}
}
/* copy these code units all at once */
if(src!=prevSrc) {
length=(int32_t)(src-prevSrc);
if((destIndex+length)<=destCapacity) {
uprv_memcpy(dest+destIndex, prevSrc, length*U_SIZEOF_UCHAR);
}
destIndex+=length;
reorderStartIndex=destIndex;
/* set prevStarter to the last character in the quick check loop */
prevStarter=src-1;
if(UTF_IS_SECOND_SURROGATE(*prevStarter) && prevSrc<prevStarter && UTF_IS_FIRST_SURROGATE(*(prevStarter-1))) {
--prevStarter;
}
prevSrc=src;
}
/* end of source reached? */
if(limit==NULL ? c==0 : src==limit) {
break;
}
/* c already contains *src and norm32 is set for it, increment src */
++src;
/*
* source buffer pointers:
*
* all done quick check current char not yet
* "yes" but (c, c2) processed
* may combine
* forward
* [-------------[-------------[-------------[-------------[
* | | | | |
* start prevStarter prevSrc src limit
*
*
* destination buffer pointers and indexes:
*
* all done might take not filled yet
* characters for
* reordering
* [-------------[-------------[-------------[
* | | | |
* dest reorderStartIndex destIndex destCapacity
*/
/* check one above-minimum, relevant code unit */
/*
* norm32 is for c=*(src-1), and the quick check flag is "no" or "maybe", and/or cc!=0
* check for Jamo V/T, then for surrogates and regular characters
* c is not a Hangul syllable or Jamo L because
* they are not marked with no/maybe for NFC & NFKC (and their cc==0)
*/
if(isNorm32HangulOrJamo(norm32)) {
/*
* c is a Jamo V/T:
* try to compose with the previous character, Jamo V also with a following Jamo T,
* and set values here right now in case we just continue with the main loop
*/
prevCC=cc=0;
reorderStartIndex=destIndex;
if(
destIndex>0 &&
_composeHangul(
*(prevSrc-1), c, norm32, src, limit, compat,
destIndex<=destCapacity ? dest+(destIndex-1) : 0,
nx)
) {
prevStarter=src;
continue;
}
/* the Jamo V/T did not compose into a Hangul syllable, just append to dest */
c2=0;
length=1;
prevStarter=prevSrc;
} else {
if(isNorm32Regular(norm32)) {
c2=0;
length=1;
} else {
/* c is a lead surrogate, get the real norm32 */
if(src!=limit && UTF_IS_SECOND_SURROGATE(c2=*src)) {
++src;
length=2;
norm32=_getNorm32FromSurrogatePair(norm32, c2);
} else {
/* c is an unpaired lead surrogate, nothing to do */
c2=0;
length=1;
norm32=0;
}
}
/* we are looking at the character (c, c2) at [prevSrc..src[ */
if(nx_contains(nx, c, c2)) {
/* excluded: norm32==0 */
cc=0;
} else if((norm32&qcMask)==0) {
cc=(uint8_t)(norm32>>_NORM_CC_SHIFT);
} else {
const UChar *p;
uint32_t decompQCMask;
/*
* find appropriate boundaries around this character,
* decompose the source text from between the boundaries,
* and recompose it
*
* this puts the intermediate text into the side buffer because
* it might be longer than the recomposition end result,
* or the destination buffer may be too short or missing
*
* note that destIndex may be adjusted backwards to account
* for source text that passed the quick check but needed to
* take part in the recomposition
*/
decompQCMask=(qcMask<<2)&0xf; /* decomposition quick check mask */
/*
* find the last true starter in [prevStarter..src[
* it is either the decomposition of the current character (at prevSrc),
* or prevStarter
*/
if(_isTrueStarter(norm32, ccOrQCMask, decompQCMask)) {
prevStarter=prevSrc;
} else {
/* adjust destIndex: back out what had been copied with qc "yes" */
destIndex-=(int32_t)(prevSrc-prevStarter);
}
/* find the next true starter in [src..limit[ - modifies src to point to the next starter */
src=_findNextStarter(src, limit, qcMask, decompQCMask, minNoMaybe);
/* compose [prevStarter..src[ */
p=_composePart(stackBuffer, buffer, bufferCapacity,
length, /* output */
prevStarter, src,
qcMask,
prevCC, /* output */
nx,
pErrorCode);
if(p==NULL) {
destIndex=0; /* an error occurred (out of memory) */
break;
}
/* append the recomposed buffer contents to the destination buffer */
if((destIndex+length)<=destCapacity) {
while(length>0) {
dest[destIndex++]=*p++;
--length;
}
} else {
/* buffer overflow */
/* keep incrementing the destIndex for preflighting */
destIndex+=length;
}
/* set the next starter */
prevStarter=src;
continue;
}
}
/* append the single code point (c, c2) to the destination buffer */
if((destIndex+length)<=destCapacity) {
if(cc!=0 && cc<prevCC) {
/* (c, c2) is out of order with respect to the preceding text */
UChar *reorderSplit=dest+destIndex;
destIndex+=length;
prevCC=_insertOrdered(dest+reorderStartIndex, reorderSplit, dest+destIndex, c, c2, cc);
} else {
/* just append (c, c2) */
dest[destIndex++]=c;
if(c2!=0) {
dest[destIndex++]=c2;
}
prevCC=cc;
}
} else {
/* buffer overflow */
/* keep incrementing the destIndex for preflighting */
destIndex+=length;
prevCC=cc;
}
}
/* cleanup */
if(buffer!=stackBuffer) {
uprv_free(buffer);
}
return destIndex;
}
U_CAPI int32_t U_EXPORT2
unorm_compose(UChar *dest, int32_t destCapacity,
const UChar *src, int32_t srcLength,
UBool compat, int32_t options,
UErrorCode *pErrorCode) {
const UnicodeSet *nx;
int32_t destIndex;
if(!_haveData(*pErrorCode)) {
return 0;
}
nx=getNX(options, *pErrorCode);
if(U_FAILURE(*pErrorCode)) {
return 0;
}
destIndex=_compose(dest, destCapacity,
src, srcLength,
compat, nx,
pErrorCode);
return u_terminateUChars(dest, destCapacity, destIndex, pErrorCode);
}
/* make FCD ----------------------------------------------------------------- */
static const UChar *
_findSafeFCD(const UChar *src, const UChar *limit, uint16_t fcd16) {
UChar c, c2;
/*
* find the first position in [src..limit[ after some cc==0 according to FCD data
*
* at the beginning of the loop, we have fcd16 from before src
*
* stop at positions:
* - after trail cc==0
* - at the end of the source
* - before lead cc==0
*/
for(;;) {
/* stop if trail cc==0 for the previous character */
if((fcd16&0xff)==0) {
break;
}
/* get c=*src - stop at end of string */
if(src==limit) {
break;
}
c=*src;
/* stop if lead cc==0 for this character */
if(c<_NORM_MIN_WITH_LEAD_CC || (fcd16=_getFCD16(c))==0) {
break; /* catches terminating NUL, too */
}
if(!UTF_IS_FIRST_SURROGATE(c)) {
if(fcd16<=0xff) {
break;
}
++src;
} else if((src+1)!=limit && (c2=*(src+1), UTF_IS_SECOND_SURROGATE(c2))) {
/* c is a lead surrogate, get the real fcd16 */
fcd16=_getFCD16FromSurrogatePair(fcd16, c2);
if(fcd16<=0xff) {
break;
}
src+=2;
} else {
/* c is an unpaired first surrogate, lead cc==0 */
break;
}
}
return src;
}
static uint8_t
_decomposeFCD(const UChar *src, const UChar *decompLimit,
UChar *dest, int32_t &destIndex, int32_t destCapacity,
const UnicodeSet *nx) {
const UChar *p;
uint32_t norm32;
int32_t reorderStartIndex, length;
UChar c, c2;
uint8_t cc, prevCC, trailCC;
/*
* canonically decompose [src..decompLimit[
*
* all characters in this range have some non-zero cc,
* directly or in decomposition,
* so that we do not need to check in the following for quick-check limits etc.
*
* there _are_ _no_ Hangul syllables or Jamos in here because they are FCD-safe (cc==0)!
*
* we also do not need to check for c==0 because we have an established decompLimit
*/
reorderStartIndex=destIndex;
prevCC=0;
while(src<decompLimit) {
c=*src++;
norm32=_getNorm32(c);
if(isNorm32Regular(norm32)) {
c2=0;
length=1;
} else {
/*
* reminder: this function is called with [src..decompLimit[
* not containing any Hangul/Jamo characters,
* therefore the only specials are lead surrogates
*/
/* c is a lead surrogate, get the real norm32 */
if(src!=decompLimit && UTF_IS_SECOND_SURROGATE(c2=*src)) {
++src;
length=2;
norm32=_getNorm32FromSurrogatePair(norm32, c2);
} else {
c2=0;
length=1;
norm32=0;
}
}
/* get the decomposition and the lead and trail cc's */
if(nx_contains(nx, c, c2)) {
/* excluded: norm32==0 */
cc=trailCC=0;
p=NULL;
} else if((norm32&_NORM_QC_NFD)==0) {
/* c does not decompose */
cc=trailCC=(uint8_t)(norm32>>_NORM_CC_SHIFT);
p=NULL;
} else {
/* c decomposes, get everything from the variable-length extra data */
p=_decompose(norm32, length, cc, trailCC);
if(length==1) {
/* fastpath a single code unit from decomposition */
c=*p;
c2=0;
p=NULL;
}
}
/* append the decomposition to the destination buffer, assume length>0 */
if((destIndex+length)<=destCapacity) {
UChar *reorderSplit=dest+destIndex;
if(p==NULL) {
/* fastpath: single code point */
if(cc!=0 && cc<prevCC) {
/* (c, c2) is out of order with respect to the preceding text */
destIndex+=length;
trailCC=_insertOrdered(dest+reorderStartIndex, reorderSplit, dest+destIndex, c, c2, cc);
} else {
/* just append (c, c2) */
dest[destIndex++]=c;
if(c2!=0) {
dest[destIndex++]=c2;
}
}
} else {
/* general: multiple code points (ordered by themselves) from decomposition */
if(cc!=0 && cc<prevCC) {
/* the decomposition is out of order with respect to the preceding text */
destIndex+=length;
trailCC=_mergeOrdered(dest+reorderStartIndex, reorderSplit, p, p+length);
} else {
/* just append the decomposition */
do {
dest[destIndex++]=*p++;
} while(--length>0);
}
}
} else {
/* buffer overflow */
/* keep incrementing the destIndex for preflighting */
destIndex+=length;
}
prevCC=trailCC;
if(prevCC==0) {
reorderStartIndex=destIndex;
}
}
return prevCC;
}
static int32_t
unorm_makeFCD(UChar *dest, int32_t destCapacity,
const UChar *src, int32_t srcLength,
const UnicodeSet *nx,
UErrorCode *pErrorCode) {
const UChar *limit, *prevSrc, *decompStart;
int32_t destIndex, length;
UChar c, c2;
uint16_t fcd16;
int16_t prevCC, cc;
if(!_haveData(*pErrorCode)) {
return 0;
}
/* initialize */
decompStart=src;
destIndex=0;
prevCC=0;
/* avoid compiler warnings */
c=0;
fcd16=0;
if(srcLength>=0) {
/* string with length */
limit=src+srcLength;
} else /* srcLength==-1 */ {
/* zero-terminated string */
limit=NULL;
}
U_ALIGN_CODE(16);
for(;;) {
/* skip a run of code units below the minimum or with irrelevant data for the FCD check */
prevSrc=src;
if(limit==NULL) {
for(;;) {
c=*src;
if(c<_NORM_MIN_WITH_LEAD_CC) {
if(c==0) {
break;
}
prevCC=(int16_t)-c;
} else if((fcd16=_getFCD16(c))==0) {
prevCC=0;
} else {
break;
}
++src;
}
} else {
for(;;) {
if(src==limit) {
break;
} else if((c=*src)<_NORM_MIN_WITH_LEAD_CC) {
prevCC=(int16_t)-c;
} else if((fcd16=_getFCD16(c))==0) {
prevCC=0;
} else {
break;
}
++src;
}
}
/*
* prevCC has values from the following ranges:
* 0..0xff - the previous trail combining class
* <0 - the negative value of the previous code unit;
* that code unit was <_NORM_MIN_WITH_LEAD_CC and its _getFCD16()
* was deferred so that average text is checked faster
*/
/* copy these code units all at once */
if(src!=prevSrc) {
length=(int32_t)(src-prevSrc);
if((destIndex+length)<=destCapacity) {
uprv_memcpy(dest+destIndex, prevSrc, length*U_SIZEOF_UCHAR);
}
destIndex+=length;
prevSrc=src;
/* prevCC<0 is only possible from the above loop, i.e., only if prevSrc<src */
if(prevCC<0) {
/* the previous character was <_NORM_MIN_WITH_LEAD_CC, we need to get its trail cc */
if(!nx_contains(nx, (UChar32)-prevCC)) {
prevCC=(int16_t)(_getFCD16((UChar)-prevCC)&0xff);
} else {
prevCC=0; /* excluded: fcd16==0 */
}
/*
* set a pointer to this below-U+0300 character;
* if prevCC==0 then it will moved to after this character below
*/
decompStart=prevSrc-1;
}
}
/*
* now:
* prevSrc==src - used later to adjust destIndex before decomposition
* prevCC>=0
*/
/* end of source reached? */
if(limit==NULL ? c==0 : src==limit) {
break;
}
/* set a pointer to after the last source position where prevCC==0 */
if(prevCC==0) {
decompStart=prevSrc;
}
/* c already contains *src and fcd16 is set for it, increment src */
++src;
/* check one above-minimum, relevant code unit */
if(UTF_IS_FIRST_SURROGATE(c)) {
/* c is a lead surrogate, get the real fcd16 */
if(src!=limit && UTF_IS_SECOND_SURROGATE(c2=*src)) {
++src;
fcd16=_getFCD16FromSurrogatePair(fcd16, c2);
} else {
c2=0;
fcd16=0;
}
} else {
c2=0;
}
/* we are looking at the character (c, c2) at [prevSrc..src[ */
if(nx_contains(nx, c, c2)) {
fcd16=0; /* excluded: fcd16==0 */
}
/* check the combining order, get the lead cc */
cc=(int16_t)(fcd16>>8);
if(cc==0 || cc>=prevCC) {
/* the order is ok */
if(cc==0) {
decompStart=prevSrc;
}
prevCC=(int16_t)(fcd16&0xff);
/* just append (c, c2) */
length= c2==0 ? 1 : 2;
if((destIndex+length)<=destCapacity) {
dest[destIndex++]=c;
if(c2!=0) {
dest[destIndex++]=c2;
}
} else {
destIndex+=length;
}
} else {
/*
* back out the part of the source that we copied already but
* is now going to be decomposed;
* prevSrc is set to after what was copied
*/
destIndex-=(int32_t)(prevSrc-decompStart);
/*
* find the part of the source that needs to be decomposed;
* to be safe and simple, decompose to before the next character with lead cc==0
*/
src=_findSafeFCD(src, limit, fcd16);
/*
* the source text does not fulfill the conditions for FCD;
* decompose and reorder a limited piece of the text
*/
prevCC=_decomposeFCD(decompStart, src,
dest, destIndex, destCapacity,
nx);
decompStart=src;
}
}
return u_terminateUChars(dest, destCapacity, destIndex, pErrorCode);
}
/* quick check functions ---------------------------------------------------- */
static UBool
unorm_checkFCD(const UChar *src, int32_t srcLength, const UnicodeSet *nx) {
const UChar *limit;
UChar c, c2;
uint16_t fcd16;
int16_t prevCC, cc;
/* initialize */
prevCC=0;
if(srcLength>=0) {
/* string with length */
limit=src+srcLength;
} else /* srcLength==-1 */ {
/* zero-terminated string */
limit=NULL;
}
U_ALIGN_CODE(16);
for(;;) {
/* skip a run of code units below the minimum or with irrelevant data for the FCD check */
if(limit==NULL) {
for(;;) {
c=*src++;
if(c<_NORM_MIN_WITH_LEAD_CC) {
if(c==0) {
return TRUE;
}
/*
* delay _getFCD16(c) for any character <_NORM_MIN_WITH_LEAD_CC