// Copyright (C) 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
*
* Copyright (C) 2003-2016, International Business Machines
* Corporation and others. All Rights Reserved.
*
******************************************************************************
* file name: ucnv_ext.cpp
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2003jun13
* created by: Markus W. Scherer
*
* Conversion extensions
*/
#include "unicode/utypes.h"
#if !UCONFIG_NO_CONVERSION && !UCONFIG_NO_LEGACY_CONVERSION
#include "unicode/uset.h"
#include "ucnv_bld.h"
#include "ucnv_cnv.h"
#include "ucnv_ext.h"
#include "cmemory.h"
#include "uassert.h"
/* to Unicode --------------------------------------------------------------- */
/*
* @return lookup value for the byte, if found; else 0
*/
static inline uint32_t
ucnv_extFindToU(const uint32_t *toUSection, int32_t length, uint8_t byte) {
uint32_t word0, word;
int32_t i, start, limit;
/* check the input byte against the lowest and highest section bytes */
start=(int32_t)UCNV_EXT_TO_U_GET_BYTE(toUSection[0]);
limit=(int32_t)UCNV_EXT_TO_U_GET_BYTE(toUSection[length-1]);
if(byte<start || limit<byte) {
return 0; /* the byte is out of range */
}
if(length==((limit-start)+1)) {
/* direct access on a linear array */
return UCNV_EXT_TO_U_GET_VALUE(toUSection[byte-start]); /* could be 0 */
}
/* word0 is suitable for <=toUSection[] comparison, word for <toUSection[] */
word0=UCNV_EXT_TO_U_MAKE_WORD(byte, 0);
/*
* Shift byte once instead of each section word and add 0xffffff.
* We will compare the shifted/added byte (bbffffff) against
* section words which have byte values in the same bit position.
* If and only if byte bb < section byte ss then bbffffff<ssvvvvvv
* for all v=0..f
* so we need not mask off the lower 24 bits of each section word.
*/
word=word0|UCNV_EXT_TO_U_VALUE_MASK;
/* binary search */
start=0;
limit=length;
for(;;) {
i=limit-start;
if(i<=1) {
break; /* done */
}
/* start<limit-1 */
if(i<=4) {
/* linear search for the last part */
if(word0<=toUSection[start]) {
break;
}
if(++start<limit && word0<=toUSection[start]) {
break;
}
if(++start<limit && word0<=toUSection[start]) {
break;
}
/* always break at start==limit-1 */
++start;
break;
}
i=(start+limit)/2;
if(word<toUSection[i]) {
limit=i;
} else {
start=i;
}
}
/* did we really find it? */
if(start<limit && byte==UCNV_EXT_TO_U_GET_BYTE(word=toUSection[start])) {
return UCNV_EXT_TO_U_GET_VALUE(word); /* never 0 */
} else {
return 0; /* not found */
}
}
/*
* TRUE if not an SI/SO stateful converter,
* or if the match length fits with the current converter state
*/
#define UCNV_EXT_TO_U_VERIFY_SISO_MATCH(sisoState, match) \
((sisoState)<0 || ((sisoState)==0) == (match==1))
/*
* this works like ucnv_extMatchFromU() except
* - the first character is in pre
* - no trie is used
* - the returned matchLength is not offset by 2
*/
static int32_t
ucnv_extMatchToU(const int32_t *cx, int8_t sisoState,
const char *pre, int32_t preLength,
const char *src, int32_t srcLength,
uint32_t *pMatchValue,
UBool /*useFallback*/, UBool flush) {
const uint32_t *toUTable, *toUSection;
uint32_t value, matchValue;
int32_t i, j, idx, length, matchLength;
uint8_t b;
if(cx==NULL || cx[UCNV_EXT_TO_U_LENGTH]<=0) {
return 0; /* no extension data, no match */
}
/* initialize */
toUTable=UCNV_EXT_ARRAY(cx, UCNV_EXT_TO_U_INDEX, uint32_t);
idx=0;
matchValue=0;
i=j=matchLength=0;
if(sisoState==0) {
/* SBCS state of an SI/SO stateful converter, look at only exactly 1 byte */
if(preLength>1) {
return 0; /* no match of a DBCS sequence in SBCS mode */
} else if(preLength==1) {
srcLength=0;
} else /* preLength==0 */ {
if(srcLength>1) {
srcLength=1;
}
}
flush=TRUE;
}
/* we must not remember fallback matches when not using fallbacks */
/* match input units until there is a full match or the input is consumed */
for(;;) {
/* go to the next section */
toUSection=toUTable+idx;
/* read first pair of the section */
value=*toUSection++;
length=UCNV_EXT_TO_U_GET_BYTE(value);
value=UCNV_EXT_TO_U_GET_VALUE(value);
if( value!=0 &&
(UCNV_EXT_TO_U_IS_ROUNDTRIP(value) ||
TO_U_USE_FALLBACK(useFallback)) &&
UCNV_EXT_TO_U_VERIFY_SISO_MATCH(sisoState, i+j)
) {
/* remember longest match so far */
matchValue=value;
matchLength=i+j;
}
/* match pre[] then src[] */
if(i<preLength) {
b=(uint8_t)pre[i++];
} else if(j<srcLength) {
b=(uint8_t)src[j++];
} else {
/* all input consumed, partial match */
if(flush || (length=(i+j))>UCNV_EXT_MAX_BYTES) {
/*
* end of the entire input stream, stop with the longest match so far
* or: partial match must not be longer than UCNV_EXT_MAX_BYTES
* because it must fit into state buffers
*/
break;
} else {
/* continue with more input next time */
return -length;
}
}
/* search for the current UChar */
value=ucnv_extFindToU(toUSection, length, b);
if(value==0) {
/* no match here, stop with the longest match so far */
break;
} else {
if(UCNV_EXT_TO_U_IS_PARTIAL(value)) {
/* partial match, continue */
idx=(int32_t)UCNV_EXT_TO_U_GET_PARTIAL_INDEX(value);
} else {
if( (UCNV_EXT_TO_U_IS_ROUNDTRIP(value) ||
TO_U_USE_FALLBACK(useFallback)) &&
UCNV_EXT_TO_U_VERIFY_SISO_MATCH(sisoState, i+j)
) {
/* full match, stop with result */
matchValue=value;
matchLength=i+j;
} else {
/* full match on fallback not taken, stop with the longest match so far */
}
break;
}
}
}
if(matchLength==0) {
/* no match at all */
return 0;
}
/* return result */
*pMatchValue=UCNV_EXT_TO_U_MASK_ROUNDTRIP(matchValue);
return matchLength;
}
static inline void
ucnv_extWriteToU(UConverter *cnv, const int32_t *cx,
uint32_t value,
UChar **target, const UChar *targetLimit,
int32_t **offsets, int32_t srcIndex,
UErrorCode *pErrorCode) {
/* output the result */
if(UCNV_EXT_TO_U_IS_CODE_POINT(value)) {
/* output a single code point */
ucnv_toUWriteCodePoint(
cnv, UCNV_EXT_TO_U_GET_CODE_POINT(value),
target, targetLimit,
offsets, srcIndex,
pErrorCode);
} else {
/* output a string - with correct data we have resultLength>0 */
ucnv_toUWriteUChars(
cnv,
UCNV_EXT_ARRAY(cx, UCNV_EXT_TO_U_UCHARS_INDEX, UChar)+
UCNV_EXT_TO_U_GET_INDEX(value),
UCNV_EXT_TO_U_GET_LENGTH(value),
target, targetLimit,
offsets, srcIndex,
pErrorCode);
}
}
/*
* get the SI/SO toU state (state 0 is for SBCS, 1 for DBCS),
* or 1 for DBCS-only,
* or -1 if the converter is not SI/SO stateful
*
* Note: For SI/SO stateful converters getting here,
* cnv->mode==0 is equivalent to firstLength==1.
*/
#define UCNV_SISO_STATE(cnv) \
((cnv)->sharedData->mbcs.outputType==MBCS_OUTPUT_2_SISO ? (int8_t)(cnv)->mode : \
(cnv)->sharedData->mbcs.outputType==MBCS_OUTPUT_DBCS_ONLY ? 1 : -1)
/*
* target<targetLimit; set error code for overflow
*/
U_CFUNC UBool
ucnv_extInitialMatchToU(UConverter *cnv, const int32_t *cx,
int32_t firstLength,
const char **src, const char *srcLimit,
UChar **target, const UChar *targetLimit,
int32_t **offsets, int32_t srcIndex,
UBool flush,
UErrorCode *pErrorCode) {
uint32_t value = 0; /* initialize output-only param to 0 to silence gcc */
int32_t match;
/* try to match */
match=ucnv_extMatchToU(cx, (int8_t)UCNV_SISO_STATE(cnv),
(const char *)cnv->toUBytes, firstLength,
*src, (int32_t)(srcLimit-*src),
&value,
cnv->useFallback, flush);
if(match>0) {
/* advance src pointer for the consumed input */
*src+=match-firstLength;
/* write result to target */
ucnv_extWriteToU(cnv, cx,
value,
target, targetLimit,
offsets, srcIndex,
pErrorCode);
return TRUE;
} else if(match<0) {
/* save state for partial match */
const char *s;
int32_t j;
/* copy the first code point */
s=(const char *)cnv->toUBytes;
cnv->preToUFirstLength=(int8_t)firstLength;
for(j=0; j<firstLength; ++j) {
cnv->preToU[j]=*s++;
}
/* now copy the newly consumed input */
s=*src;
match=-match;
for(; j<match; ++j) {
cnv->preToU[j]=*s++;
}
*src=s; /* same as *src=srcLimit; because we reached the end of input */
cnv->preToULength=(int8_t)match;
return TRUE;
} else /* match==0 no match */ {
return FALSE;
}
}
U_CFUNC UChar32
ucnv_extSimpleMatchToU(const int32_t *cx,
const char *source, int32_t length,
UBool useFallback) {
uint32_t value = 0; /* initialize output-only param to 0 to silence gcc */
int32_t match;
if(length<=0) {
return 0xffff;
}
/* try to match */
match=ucnv_extMatchToU(cx, -1,
source, length,
NULL, 0,
&value,
useFallback, TRUE);
if(match==length) {
/* write result for simple, single-character conversion */
if(UCNV_EXT_TO_U_IS_CODE_POINT(value)) {
return UCNV_EXT_TO_U_GET_CODE_POINT(value);
}
}
/*
* return no match because
* - match>0 && value points to string: simple conversion cannot handle multiple code points
* - match>0 && match!=length: not all input consumed, forbidden for this function
* - match==0: no match found in the first place
* - match<0: partial match, not supported for simple conversion (and flush==TRUE)
*/
return 0xfffe;
}
/*
* continue partial match with new input
* never called for simple, single-character conversion
*/
U_CFUNC void
ucnv_extContinueMatchToU(UConverter *cnv,
UConverterToUnicodeArgs *pArgs, int32_t srcIndex,
UErrorCode *pErrorCode) {
uint32_t value = 0; /* initialize output-only param to 0 to silence gcc */
int32_t match, length;
match=ucnv_extMatchToU(cnv->sharedData->mbcs.extIndexes, (int8_t)UCNV_SISO_STATE(cnv),
cnv->preToU, cnv->preToULength,
pArgs->source, (int32_t)(pArgs->sourceLimit-pArgs->source),
&value,
cnv->useFallback, pArgs->flush);
if(match>0) {
if(match>=cnv->preToULength) {
/* advance src pointer for the consumed input */
pArgs->source+=match-cnv->preToULength;
cnv->preToULength=0;
} else {
/* the match did not use all of preToU[] - keep the rest for replay */
length=cnv->preToULength-match;
uprv_memmove(cnv->preToU, cnv->preToU+match, length);
cnv->preToULength=(int8_t)-length;
}
/* write result */
ucnv_extWriteToU(cnv, cnv->sharedData->mbcs.extIndexes,
value,
&pArgs->target, pArgs->targetLimit,
&pArgs->offsets, srcIndex,
pErrorCode);
} else if(match<0) {
/* save state for partial match */
const char *s;
int32_t j;
/* just _append_ the newly consumed input to preToU[] */
s=pArgs->source;
match=-match;
for(j=cnv->preToULength; j<match; ++j) {
cnv->preToU[j]=*s++;
}
pArgs->source=s; /* same as *src=srcLimit; because we reached the end of input */
cnv->preToULength=(int8_t)match;
} else /* match==0 */ {
/*
* no match
*
* We need to split the previous input into two parts:
*
* 1. The first codepage character is unmappable - that's how we got into
* trying the extension data in the first place.
* We need to move it from the preToU buffer
* to the error buffer, set an error code,
* and prepare the rest of the previous input for 2.
*
* 2. The rest of the previous input must be converted once we
* come back from the callback for the first character.
* At that time, we have to try again from scratch to convert
* these input characters.
* The replay will be handled by the ucnv.c conversion code.
*/
/* move the first codepage character to the error field */
uprv_memcpy(cnv->toUBytes, cnv->preToU, cnv->preToUFirstLength);
cnv->toULength=cnv->preToUFirstLength;
/* move the rest up inside the buffer */
length=cnv->preToULength-cnv->preToUFirstLength;
if(length>0) {
uprv_memmove(cnv->preToU, cnv->preToU+cnv->preToUFirstLength, length);
}
/* mark preToU for replay */
cnv->preToULength=(int8_t)-length;
/* set the error code for unassigned */
*pErrorCode=U_INVALID_CHAR_FOUND;
}
}
/* from Unicode ------------------------------------------------------------- */
// Use roundtrips, "good one-way" mappings, and some normal fallbacks.
static inline UBool
extFromUUseMapping(UBool useFallback, uint32_t value, UChar32 firstCP) {
return
((value&UCNV_EXT_FROM_U_STATUS_MASK)!=0 ||
FROM_U_USE_FALLBACK(useFallback, firstCP)) &&
(value&UCNV_EXT_FROM_U_RESERVED_MASK)==0;
}
/*
* @return index of the UChar, if found; else <0
*/
static inline int32_t
ucnv_extFindFromU(const UChar *fromUSection, int32_t length, UChar u) {
int32_t i, start, limit;
/* binary search */
start=0;
limit=length;
for(;;) {
i=limit-start;
if(i<=1) {
break; /* done */
}
/* start<limit-1 */
if(i<=4) {
/* linear search for the last part */
if(u<=fromUSection[start]) {
break;
}
if(++start<limit && u<=fromUSection[start]) {
break;
}
if(++start<limit && u<=fromUSection[start]) {
break;
}
/* always break at start==limit-1 */
++start;
break;
}
i=(start+limit)/2;
if(u<fromUSection[i]) {
limit=i;
} else {
start=i;
}
}
/* did we really find it? */
if(start<limit && u==fromUSection[start]) {
return start;
} else {
return -1; /* not found */
}
}
/*
* @param cx pointer to extension data; if NULL, returns 0
* @param firstCP the first code point before all the other UChars
* @param pre UChars that must match; !initialMatch: partial match with them
* @param preLength length of pre, >=0
* @param src UChars that can be used to complete a match
* @param srcLength length of src, >=0
* @param pMatchValue [out] output result value for the match from the data structure
* @param useFallback "use fallback" flag, usually from cnv->useFallback
* @param flush TRUE if the end of the input stream is reached
* @return >1: matched, return value=total match length (number of input units matched)
* 1: matched, no mapping but request for <subchar1>
* (only for the first code point)
* 0: no match
* <0: partial match, return value=negative total match length
* (partial matches are never returned for flush==TRUE)
* (partial matches are never returned as being longer than UCNV_EXT_MAX_UCHARS)
* the matchLength is 2 if only firstCP matched, and >2 if firstCP and
* further code units matched
*/
static int32_t
ucnv_extMatchFromU(const int32_t *cx,
UChar32 firstCP,
const UChar *pre, int32_t preLength,
const UChar *src, int32_t srcLength,
uint32_t *pMatchValue,
UBool useFallback, UBool flush) {
const uint16_t *stage12, *stage3;
const uint32_t *stage3b;
const UChar *fromUTableUChars, *fromUSectionUChars;
const uint32_t *fromUTableValues, *fromUSectionValues;
uint32_t value, matchValue;
int32_t i, j, idx, length, matchLength;
UChar c;
if(cx==NULL) {
return 0; /* no extension data, no match */
}
/* trie lookup of firstCP */
idx=firstCP>>10; /* stage 1 index */
if(idx>=cx[UCNV_EXT_FROM_U_STAGE_1_LENGTH]) {
return 0; /* the first code point is outside the trie */
}
stage12=UCNV_EXT_ARRAY(cx, UCNV_EXT_FROM_U_STAGE_12_INDEX, uint16_t);
stage3=UCNV_EXT_ARRAY(cx, UCNV_EXT_FROM_U_STAGE_3_INDEX, uint16_t);
idx=UCNV_EXT_FROM_U(stage12, stage3, idx, firstCP);
stage3b=UCNV_EXT_ARRAY(cx, UCNV_EXT_FROM_U_STAGE_3B_INDEX, uint32_t);
value=stage3b[idx];
if(value==0) {
return 0;
}
/*
* Tests for (value&UCNV_EXT_FROM_U_RESERVED_MASK)==0:
* Do not interpret values with reserved bits used, for forward compatibility,
* and do not even remember intermediate results with reserved bits used.
*/
if(UCNV_EXT_TO_U_IS_PARTIAL(value)) {
/* partial match, enter the loop below */
idx=(int32_t)UCNV_EXT_FROM_U_GET_PARTIAL_INDEX(value);
/* initialize */
fromUTableUChars=UCNV_EXT_ARRAY(cx, UCNV_EXT_FROM_U_UCHARS_INDEX, UChar);
fromUTableValues=UCNV_EXT_ARRAY(cx, UCNV_EXT_FROM_U_VALUES_INDEX, uint32_t);
matchValue=0;
i=j=matchLength=0;
/* we must not remember fallback matches when not using fallbacks */
/* match input units until there is a full match or the input is consumed */
for(;;) {
/* go to the next section */
fromUSectionUChars=fromUTableUChars+idx;
fromUSectionValues=fromUTableValues+idx;
/* read first pair of the section */
length=*fromUSectionUChars++;
value=*fromUSectionValues++;
if(value!=0 && extFromUUseMapping(useFallback, value, firstCP)) {
/* remember longest match so far */
matchValue=value;
matchLength=2+i+j;
}
/* match pre[] then src[] */
if(i<preLength) {
c=pre[i++];
} else if(j<srcLength) {
c=src[j++];
} else {
/* all input consumed, partial match */
if(flush || (length=(i+j))>UCNV_EXT_MAX_UCHARS) {
/*
* end of the entire input stream, stop with the longest match so far
* or: partial match must not be longer than UCNV_EXT_MAX_UCHARS
* because it must fit into state buffers
*/
break;
} else {
/* continue with more input next time */
return -(2+length);
}
}
/* search for the current UChar */
idx=ucnv_extFindFromU(fromUSectionUChars, length, c);
if(idx<0) {
/* no match here, stop with the longest match so far */
break;
} else {
value=fromUSectionValues[idx];
if(UCNV_EXT_FROM_U_IS_PARTIAL(value)) {
/* partial match, continue */
idx=(int32_t)UCNV_EXT_FROM_U_GET_PARTIAL_INDEX(value);
} else {
if(extFromUUseMapping(useFallback, value, firstCP)) {
/* full match, stop with result */
matchValue=value;
matchLength=2+i+j;
} else {
/* full match on fallback not taken, stop with the longest match so far */
}
break;
}
}
}
if(matchLength==0) {
/* no match at all */
return 0;
}
} else /* result from firstCP trie lookup */ {
if(extFromUUseMapping(useFallback, value, firstCP)) {
/* full match, stop with result */
matchValue=value;
matchLength=2;
} else {
/* fallback not taken */
return 0;
}
}
/* return result */
if(matchValue==UCNV_EXT_FROM_U_SUBCHAR1) {
return 1; /* assert matchLength==2 */
}
*pMatchValue=matchValue;
return matchLength;
}
/*
* @param value fromUnicode mapping table value; ignores roundtrip and reserved bits
*/
static inline void
ucnv_extWriteFromU(UConverter *cnv, const int32_t *cx,
uint32_t value,
char **target, const char *targetLimit,
int32_t **offsets, int32_t srcIndex,
UErrorCode *pErrorCode) {
uint8_t buffer[1+UCNV_EXT_MAX_BYTES];
const uint8_t *result;
int32_t length, prevLength;
length=UCNV_EXT_FROM_U_GET_LENGTH(value);
value=(uint32_t)UCNV_EXT_FROM_U_GET_DATA(value);
/* output the result */
if(length<=UCNV_EXT_FROM_U_MAX_DIRECT_LENGTH) {
/*
* Generate a byte array and then write it below.
* This is not the fastest possible way, but it should be ok for
* extension mappings, and it is much simpler.
* Offset and overflow handling are only done once this way.
*/
uint8_t *p=buffer+1; /* reserve buffer[0] for shiftByte below */
switch(length) {
case 3:
*p++=(uint8_t)(value>>16);
U_FALLTHROUGH;
case 2:
*p++=(uint8_t)(value>>8);
U_FALLTHROUGH;
case 1:
*p++=(uint8_t)value;
U_FALLTHROUGH;
default:
break; /* will never occur */
}
result=buffer+1;
} else {
result=UCNV_EXT_ARRAY(cx, UCNV_EXT_FROM_U_BYTES_INDEX, uint8_t)+value;
}
/* with correct data we have length>0 */
if((prevLength=cnv->fromUnicodeStatus)!=0) {
/* handle SI/SO stateful output */
uint8_t shiftByte;
if(prevLength>1 && length==1) {
/* change from double-byte mode to single-byte */
shiftByte=(uint8_t)UCNV_SI;
cnv->fromUnicodeStatus=1;
} else if(prevLength==1 && length>1) {
/* change from single-byte mode to double-byte */
shiftByte=(uint8_t)UCNV_SO;
cnv->fromUnicodeStatus=2;
} else {
shiftByte=0;
}
if(shiftByte!=0) {
/* prepend the shift byte to the result bytes */
buffer[0]=shiftByte;
if(result!=buffer+1) {
uprv_memcpy(buffer+1, result, length);
}
result=buffer;
++length;
}
}
ucnv_fromUWriteBytes(cnv, (const char *)result, length,
target, targetLimit,
offsets, srcIndex,
pErrorCode);
}
/*
* target<targetLimit; set error code for overflow
*/
U_CFUNC UBool
ucnv_extInitialMatchFromU(UConverter *cnv, const int32_t *cx,
UChar32 cp,
const UChar **src, const UChar *srcLimit,
char **target, const char *targetLimit,
int32_t **offsets, int32_t srcIndex,
UBool flush,
UErrorCode *pErrorCode) {
uint32_t value = 0; /* initialize output-only param to 0 to silence gcc */
int32_t match;
/* try to match */
match=ucnv_extMatchFromU(cx, cp,
NULL, 0,
*src, (int32_t)(srcLimit-*src),
&value,
cnv->useFallback, flush);
/* reject a match if the result is a single byte for DBCS-only */
if( match>=2 &&
!(UCNV_EXT_FROM_U_GET_LENGTH(value)==1 &&
cnv->sharedData->mbcs.outputType==MBCS_OUTPUT_DBCS_ONLY)
) {
/* advance src pointer for the consumed input */
*src+=match-2; /* remove 2 for the initial code point */
/* write result to target */
ucnv_extWriteFromU(cnv, cx,
value,
target, targetLimit,
offsets, srcIndex,
pErrorCode);
return TRUE;
} else if(match<0) {
/* save state for partial match */
const UChar *s;
int32_t j;
/* copy the first code point */
cnv->preFromUFirstCP=cp;
/* now copy the newly consumed input */
s=*src;
match=-match-2; /* remove 2 for the initial code point */
for(j=0; j<match; ++j) {
cnv->preFromU[j]=*s++;
}
*src=s; /* same as *src=srcLimit; because we reached the end of input */
cnv->preFromULength=(int8_t)match;
return TRUE;
} else if(match==1) {
/* matched, no mapping but request for <subchar1> */
cnv->useSubChar1=TRUE;
return FALSE;
} else /* match==0 no match */ {
return FALSE;
}
}
/*
* Used by ISO 2022 implementation.
* @return number of bytes in *pValue; negative number if fallback; 0 for no mapping
*/
U_CFUNC int32_t
ucnv_extSimpleMatchFromU(const int32_t *cx,
UChar32 cp, uint32_t *pValue,
UBool useFallback) {
uint32_t value;
int32_t match;
/* try to match */
match=ucnv_extMatchFromU(cx,
cp,
NULL, 0,
NULL, 0,
&value,
useFallback, TRUE);
if(match>=2) {
/* write result for simple, single-character conversion */
int32_t length;
int isRoundtrip;
isRoundtrip=UCNV_EXT_FROM_U_IS_ROUNDTRIP(value);
length=UCNV_EXT_FROM_U_GET_LENGTH(value);
value=(uint32_t)UCNV_EXT_FROM_U_GET_DATA(value);
if(length<=UCNV_EXT_FROM_U_MAX_DIRECT_LENGTH) {
*pValue=value;
return isRoundtrip ? length : -length;
#if 0 /* not currently used */
} else if(length==4) {
/* de-serialize a 4-byte result */
const uint8_t *result=UCNV_EXT_ARRAY(cx, UCNV_EXT_FROM_U_BYTES_INDEX, uint8_t)+value;
*pValue=
((uint32_t)result[0]<<24)|
((uint32_t)result[1]<<16)|
((uint32_t)result[2]<<8)|
result[3];
return isRoundtrip ? 4 : -4;
#endif
}
}
/*
* return no match because
* - match>1 && resultLength>4: result too long for simple conversion
* - match==1: no match found, <subchar1> preferred
* - match==0: no match found in the first place
* - match<0: partial match, not supported for simple conversion (and flush==TRUE)
*/
return 0;
}
/*
* continue partial match with new input, requires cnv->preFromUFirstCP>=0
* never called for simple, single-character conversion
*/
U_CFUNC void
ucnv_extContinueMatchFromU(UConverter *cnv,
UConverterFromUnicodeArgs *pArgs, int32_t srcIndex,
UErrorCode *pErrorCode) {
uint32_t value = 0; /* initialize output-only param to 0 to silence gcc */
int32_t match;
match=ucnv_extMatchFromU(cnv->sharedData->mbcs.extIndexes,
cnv->preFromUFirstCP,
cnv->preFromU, cnv->preFromULength,
pArgs->source, (int32_t)(pArgs->sourceLimit-pArgs->source),
&value,
cnv->useFallback, pArgs->flush);
if(match>=2) {
match-=2; /* remove 2 for the initial code point */
if(match>=cnv->preFromULength) {
/* advance src pointer for the consumed input */
pArgs->source+=match-cnv->preFromULength;
cnv->preFromULength=0;
} else {
/* the match did not use all of preFromU[] - keep the rest for replay */
int32_t length=cnv->preFromULength-match;
u_memmove(cnv->preFromU, cnv->preFromU+match, length);
cnv->preFromULength=(int8_t)-length;
}
/* finish the partial match */
cnv->preFromUFirstCP=U_SENTINEL;
/* write result */
ucnv_extWriteFromU(cnv, cnv->sharedData->mbcs.extIndexes,
value,
&pArgs->target, pArgs->targetLimit,
&pArgs->offsets, srcIndex,
pErrorCode);
} else if(match<0) {
/* save state for partial match */
const UChar *s;
int32_t j;
/* just _append_ the newly consumed input to preFromU[] */
s=pArgs->source;
match=-match-2; /* remove 2 for the initial code point */
for(j=cnv->preFromULength; j<match; ++j) {
U_ASSERT(j>=0);
cnv->preFromU[j]=*s++;
}
pArgs->source=s; /* same as *src=srcLimit; because we reached the end of input */
cnv->preFromULength=(int8_t)match;
} else /* match==0 or 1 */ {
/*
* no match
*
* We need to split the previous input into two parts:
*
* 1. The first code point is unmappable - that's how we got into
* trying the extension data in the first place.
* We need to move it from the preFromU buffer
* to the error buffer, set an error code,
* and prepare the rest of the previous input for 2.
*
* 2. The rest of the previous input must be converted once we
* come back from the callback for the first code point.
* At that time, we have to try again from scratch to convert
* these input characters.
* The replay will be handled by the ucnv.c conversion code.
*/
if(match==1) {
/* matched, no mapping but request for <subchar1> */
cnv->useSubChar1=TRUE;
}
/* move the first code point to the error field */
cnv->fromUChar32=cnv->preFromUFirstCP;
cnv->preFromUFirstCP=U_SENTINEL;
/* mark preFromU for replay */
cnv->preFromULength=-cnv->preFromULength;
/* set the error code for unassigned */
*pErrorCode=U_INVALID_CHAR_FOUND;
}
}
static UBool
extSetUseMapping(UConverterUnicodeSet which, int32_t minLength, uint32_t value) {
if(which==UCNV_ROUNDTRIP_SET) {
// Add only code points for which the roundtrip flag is set.
// Do not add any fallbacks, even if ucnv_fromUnicode() would use them
// (fallbacks from PUA). See the API docs for ucnv_getUnicodeSet().
//
// By analogy, also do not add "good one-way" mappings.
//
// Do not add entries with reserved bits set.
if(((value&(UCNV_EXT_FROM_U_ROUNDTRIP_FLAG|UCNV_EXT_FROM_U_RESERVED_MASK))!=
UCNV_EXT_FROM_U_ROUNDTRIP_FLAG)) {
return FALSE;
}
} else /* UCNV_ROUNDTRIP_AND_FALLBACK_SET */ {
// Do not add entries with reserved bits set.
if((value&UCNV_EXT_FROM_U_RESERVED_MASK)!=0) {
return FALSE;
}
}
// Do not add <subchar1> entries or other (future?) pseudo-entries
// with an output length of 0.
return UCNV_EXT_FROM_U_GET_LENGTH(value)>=minLength;
}
static void
ucnv_extGetUnicodeSetString(const UConverterSharedData *sharedData,
const int32_t *cx,
const USetAdder *sa,
UConverterUnicodeSet which,
int32_t minLength,
UChar32 firstCP,
UChar s[UCNV_EXT_MAX_UCHARS], int32_t length,
int32_t sectionIndex,
UErrorCode *pErrorCode) {
const UChar *fromUSectionUChars;
const uint32_t *fromUSectionValues;
uint32_t value;
int32_t i, count;
fromUSectionUChars=UCNV_EXT_ARRAY(cx, UCNV_EXT_FROM_U_UCHARS_INDEX, UChar)+sectionIndex;
fromUSectionValues=UCNV_EXT_ARRAY(cx, UCNV_EXT_FROM_U_VALUES_INDEX, uint32_t)+sectionIndex;
/* read first pair of the section */
count=*fromUSectionUChars++;
value=*fromUSectionValues++;
if(extSetUseMapping(which, minLength, value)) {
if(length==U16_LENGTH(firstCP)) {
/* add the initial code point */
sa->add(sa->set, firstCP);
} else {
/* add the string so far */
sa->addString(sa->set, s, length);
}
}
for(i=0; i<count; ++i) {
/* append this code unit and recurse or add the string */
s[length]=fromUSectionUChars[i];
value=fromUSectionValues[i];
if(value==0) {
/* no mapping, do nothing */
} else if(UCNV_EXT_FROM_U_IS_PARTIAL(value)) {
ucnv_extGetUnicodeSetString(
sharedData, cx, sa, which, minLength,
firstCP, s, length+1,
(int32_t)UCNV_EXT_FROM_U_GET_PARTIAL_INDEX(value),
pErrorCode);
} else if(extSetUseMapping(which, minLength, value)) {
sa->addString(sa->set, s, length+1);
}
}
}
U_CFUNC void
ucnv_extGetUnicodeSet(const UConverterSharedData *sharedData,
const USetAdder *sa,
UConverterUnicodeSet which,
UConverterSetFilter filter,
UErrorCode *pErrorCode) {
const int32_t *cx;
const uint16_t *stage12, *stage3, *ps2, *ps3;
const uint32_t *stage3b;
uint32_t value;
int32_t st1, stage1Length, st2, st3, minLength;
UChar s[UCNV_EXT_MAX_UCHARS];
UChar32 c;
int32_t length;
cx=sharedData->mbcs.extIndexes;
if(cx==NULL) {
return;
}
stage12=UCNV_EXT_ARRAY(cx, UCNV_EXT_FROM_U_STAGE_12_INDEX, uint16_t);
stage3=UCNV_EXT_ARRAY(cx, UCNV_EXT_FROM_U_STAGE_3_INDEX, uint16_t);
stage3b=UCNV_EXT_ARRAY(cx, UCNV_EXT_FROM_U_STAGE_3B_INDEX, uint32_t);
stage1Length=cx[UCNV_EXT_FROM_U_STAGE_1_LENGTH];
/* enumerate the from-Unicode trie table */
c=0; /* keep track of the current code point while enumerating */
if(filter==UCNV_SET_FILTER_2022_CN) {
minLength=3;
} else if( sharedData->mbcs.outputType==MBCS_OUTPUT_DBCS_ONLY ||
filter!=UCNV_SET_FILTER_NONE
) {
/* DBCS-only, ignore single-byte results */
minLength=2;
} else {
minLength=1;
}
/*
* the trie enumeration is almost the same as
* in MBCSGetUnicodeSet() for MBCS_OUTPUT_1
*/
for(st1=0; st1<stage1Length; ++st1) {
st2=stage12[st1];
if(st2>stage1Length) {
ps2=stage12+st2;
for(st2=0; st2<64; ++st2) {
if((st3=(int32_t)ps2[st2]<<UCNV_EXT_STAGE_2_LEFT_SHIFT)!=0) {
/* read the stage 3 block */
ps3=stage3+st3;
do {
value=stage3b[*ps3++];
if(value==0) {
/* no mapping, do nothing */
} else if(UCNV_EXT_FROM_U_IS_PARTIAL(value)) {
// Recurse for partial results.
length=0;
U16_APPEND_UNSAFE(s, length, c);
ucnv_extGetUnicodeSetString(
sharedData, cx, sa, which, minLength,
c, s, length,
(int32_t)UCNV_EXT_FROM_U_GET_PARTIAL_INDEX(value),
pErrorCode);
} else if(extSetUseMapping(which, minLength, value)) {
switch(filter) {
case UCNV_SET_FILTER_2022_CN:
if(!(UCNV_EXT_FROM_U_GET_LENGTH(value)==3 && UCNV_EXT_FROM_U_GET_DATA(value)<=0x82ffff)) {
continue;
}
break;
case UCNV_SET_FILTER_SJIS:
if(!(UCNV_EXT_FROM_U_GET_LENGTH(value)==2 && (value=UCNV_EXT_FROM_U_GET_DATA(value))>=0x8140 && value<=0xeffc)) {
continue;
}
break;
case UCNV_SET_FILTER_GR94DBCS:
if(!(UCNV_EXT_FROM_U_GET_LENGTH(value)==2 &&
(uint16_t)((value=UCNV_EXT_FROM_U_GET_DATA(value))-0xa1a1)<=(0xfefe - 0xa1a1) &&
(uint8_t)(value-0xa1)<=(0xfe - 0xa1))) {
continue;
}
break;
case UCNV_SET_FILTER_HZ:
if(!(UCNV_EXT_FROM_U_GET_LENGTH(value)==2 &&
(uint16_t)((value=UCNV_EXT_FROM_U_GET_DATA(value))-0xa1a1)<=(0xfdfe - 0xa1a1) &&
(uint8_t)(value-0xa1)<=(0xfe - 0xa1))) {
continue;
}
break;
default:
/*
* UCNV_SET_FILTER_NONE,
* or UCNV_SET_FILTER_DBCS_ONLY which is handled via minLength
*/
break;
}
sa->add(sa->set, c);
}
} while((++c&0xf)!=0);
} else {
c+=16; /* empty stage 3 block */
}
}
} else {
c+=1024; /* empty stage 2 block */
}
}
}
#endif /* #if !UCONFIG_NO_LEGACY_CONVERSION */