/*
* remove mappings with their move flag set from the base table
* and move some of them (with UCM_MOVE_TO_EXT) to the extension table
*/
U_CAPI void U_EXPORT2
ucm_moveMappings(UCMTable *base, UCMTable *ext) {
UCMapping *mb, *mbLimit;
int8_t flag;
mb=base->mappings;
mbLimit=mb+base->mappingsLength;
while(mb<mbLimit) {
flag=mb->moveFlag;
if(flag!=0) {
/* reset the move flag */
mb->moveFlag=0;
if(ext!=NULL && (flag&UCM_MOVE_TO_EXT)) {
/* add the mapping to the extension table */
ucm_addMapping(ext, mb, UCM_GET_CODE_POINTS(base, mb), UCM_GET_BYTES(base, mb));
}
/* remove this mapping: move the last base mapping down and overwrite the current one */
if(mb<(mbLimit-1)) {
uprv_memcpy(mb, mbLimit-1, sizeof(UCMapping));
}
--mbLimit;
--base->mappingsLength;
base->isSorted=FALSE;
} else {
++mb;
}
}
}
U_CAPI UBool U_EXPORT2
ucm_separateMappings(UCMFile *ucm, UBool isSISO) {
UCMTable *table;
UCMapping *m, *mLimit;
int32_t type;
UBool needsMove, isOK;
table=ucm->base;
m=table->mappings;
mLimit=m+table->mappingsLength;
needsMove=FALSE;
isOK=TRUE;
for(; m<mLimit; ++m) {
if(isSISO && m->bLen==1 && (m->b.bytes[0]==0xe || m->b.bytes[0]==0xf)) {
fprintf(stderr, "warning: removing illegal mapping from an SI/SO-stateful table\n");
ucm_printMapping(table, m, stderr);
m->moveFlag|=UCM_REMOVE_MAPPING;
needsMove=TRUE;
continue;
}
type=ucm_mappingType(
&ucm->states, m,
UCM_GET_CODE_POINTS(table, m), UCM_GET_BYTES(table, m));
if(type<0) {
/* illegal byte sequence */
printMapping(m, UCM_GET_CODE_POINTS(table, m), UCM_GET_BYTES(table, m), stderr);
isOK=FALSE;
} else if(type>0) {
m->moveFlag|=UCM_MOVE_TO_EXT;
needsMove=TRUE;
}
}
if(!isOK) {
return FALSE;
}
if(needsMove) {
ucm_moveMappings(ucm->base, ucm->ext);
return ucm_checkBaseExt(&ucm->states, ucm->base, ucm->ext, ucm->ext, FALSE);
} else {
ucm_sortTable(ucm->base);
return TRUE;
}
}
static int32_t
compareBytes(UCMTable *lTable, const UCMapping *l,
UCMTable *rTable, const UCMapping *r,
UBool lexical) {
const uint8_t *lb, *rb;
int32_t result, i, length;
/*
* A lexical comparison is used for sorting in the builder, to allow
* an efficient search for a byte sequence that could be a prefix
* of a previously entered byte sequence.
*
* Comparing by lengths first is for compatibility with old .ucm tools
* like canonucm and rptp2ucm.
*/
if(lexical) {
/* get the minimum length and continue */
if(l->bLen<=r->bLen) {
length=l->bLen;
} else {
length=r->bLen;
}
} else {
/* compare lengths first */
result=l->bLen-r->bLen;
if(result!=0) {
return result;
} else {
length=l->bLen;
}
}
/* get pointers to the byte sequences */
lb=UCM_GET_BYTES(lTable, l);
rb=UCM_GET_BYTES(rTable, r);
/* compare the bytes */
for(i=0; i<length; ++i) {
result=lb[i]-rb[i];
if(result!=0) {
return result;
}
}
/* compare the lengths */
return l->bLen-r->bLen;
}
U_CAPI UBool U_EXPORT2
ucm_checkValidity(UCMTable *table, UCMStates *baseStates) {
UCMapping *m, *mLimit;
int32_t count;
UBool isOK;
m=table->mappings;
mLimit=m+table->mappingsLength;
isOK=TRUE;
while(m<mLimit) {
count=ucm_countChars(baseStates, UCM_GET_BYTES(table, m), m->bLen);
if(count<1) {
ucm_printMapping(table, m, stderr);
isOK=FALSE;
}
++m;
}
return isOK;
}
U_CAPI void U_EXPORT2
ucm_printMapping(UCMTable *table, UCMapping *m, FILE *f) {
printMapping(m, UCM_GET_CODE_POINTS(table, m), UCM_GET_BYTES(table, m), f);
}
U_CAPI void U_EXPORT2
ucm_mergeTables(UCMTable *fromUTable, UCMTable *toUTable,
const uint8_t *subchar, int32_t subcharLength,
uint8_t subchar1) {
UCMapping *fromUMapping, *toUMapping;
int32_t fromUIndex, toUIndex, fromUTop, toUTop, cmp;
ucm_sortTable(fromUTable);
ucm_sortTable(toUTable);
fromUMapping=fromUTable->mappings;
toUMapping=toUTable->mappings;
fromUTop=fromUTable->mappingsLength;
toUTop=toUTable->mappingsLength;
fromUIndex=toUIndex=0;
while(fromUIndex<fromUTop && toUIndex<toUTop) {
cmp=compareMappings(fromUTable, fromUMapping, toUTable, toUMapping, TRUE);
if(cmp==0) {
/* equal: roundtrip, nothing to do (flags are initially 0) */
++fromUMapping;
++toUMapping;
++fromUIndex;
++toUIndex;
} else if(cmp<0) {
/*
* the fromU mapping does not have a toU counterpart:
* fallback Unicode->codepage
*/
if( (fromUMapping->bLen==subcharLength &&
0==uprv_memcmp(UCM_GET_BYTES(fromUTable, fromUMapping), subchar, subcharLength)) ||
(subchar1!=0 && fromUMapping->bLen==1 && fromUMapping->b.bytes[0]==subchar1)
) {
fromUMapping->f=2; /* SUB mapping */
} else {
fromUMapping->f=1; /* normal fallback */
}
++fromUMapping;
++fromUIndex;
} else {
/*
* the toU mapping does not have a fromU counterpart:
* (reverse) fallback codepage->Unicode, copy it to the fromU table
*/
/* ignore reverse fallbacks to Unicode SUB */
if(!(toUMapping->uLen==1 && (toUMapping->u==0xfffd || toUMapping->u==0x1a))) {
toUMapping->f=3; /* reverse fallback */
ucm_addMapping(fromUTable, toUMapping, UCM_GET_CODE_POINTS(toUTable, toUMapping), UCM_GET_BYTES(toUTable, toUMapping));
/* the table may have been reallocated */
fromUMapping=fromUTable->mappings+fromUIndex;
}
++toUMapping;
++toUIndex;
}
}
/* either one or both tables are exhausted */
while(fromUIndex<fromUTop) {
/* leftover fromU mappings are fallbacks */
if( (fromUMapping->bLen==subcharLength &&
0==uprv_memcmp(UCM_GET_BYTES(fromUTable, fromUMapping), subchar, subcharLength)) ||
(subchar1!=0 && fromUMapping->bLen==1 && fromUMapping->b.bytes[0]==subchar1)
) {
fromUMapping->f=2; /* SUB mapping */
} else {
fromUMapping->f=1; /* normal fallback */
}
++fromUMapping;
++fromUIndex;
}
while(toUIndex<toUTop) {
/* leftover toU mappings are reverse fallbacks */
/* ignore reverse fallbacks to Unicode SUB */
if(!(toUMapping->uLen==1 && (toUMapping->u==0xfffd || toUMapping->u==0x1a))) {
toUMapping->f=3; /* reverse fallback */
ucm_addMapping(fromUTable, toUMapping, UCM_GET_CODE_POINTS(toUTable, toUMapping), UCM_GET_BYTES(toUTable, toUMapping));
}
++toUMapping;
++toUIndex;
}
fromUTable->isSorted=FALSE;
}
static uint8_t
checkBaseExtBytes(UCMStates *baseStates, UCMTable *base, UCMTable *ext,
UBool moveToExt, UBool intersectBase) {
UCMapping *mb, *me;
int32_t *baseMap, *extMap;
int32_t b, e, bLimit, eLimit, cmp;
uint8_t result;
UBool isSISO;
baseMap=base->reverseMap;
extMap=ext->reverseMap;
b=e=0;
bLimit=base->mappingsLength;
eLimit=ext->mappingsLength;
result=0;
isSISO=(UBool)(baseStates->outputType==MBCS_OUTPUT_2_SISO);
for(;;) {
/* skip irrelevant mappings on both sides */
for(;; ++b) {
if(b==bLimit) {
return result;
}
mb=base->mappings+baseMap[b];
if(intersectBase==2 && mb->bLen==1) {
/*
* comparing a base against a DBCS extension:
* leave SBCS base mappings alone
*/
continue;
}
if(mb->f==0 || mb->f==3) {
break;
}
}
for(;;) {
if(e==eLimit) {
return result;
}
me=ext->mappings+extMap[e];
if(me->f==0 || me->f==3) {
break;
}
++e;
}
/* compare the base and extension mappings */
cmp=compareBytes(base, mb, ext, me, TRUE);
if(cmp<0) {
if(intersectBase) {
/* mapping in base but not in ext, move it */
mb->moveFlag|=UCM_MOVE_TO_EXT;
result|=NEEDS_MOVE;
/*
* does mb map from an input sequence that is a prefix of me's?
* for SI/SO tables, a single byte is never a prefix because it
* occurs in a separate single-byte state
*/
} else if( mb->bLen<me->bLen &&
(!isSISO || mb->bLen>1) &&
0==uprv_memcmp(UCM_GET_BYTES(base, mb), UCM_GET_BYTES(ext, me), mb->bLen)
) {
if(moveToExt) {
/* mark this mapping to be moved to the extension table */
mb->moveFlag|=UCM_MOVE_TO_EXT;
result|=NEEDS_MOVE;
} else {
fprintf(stderr,
"ucm error: the base table contains a mapping whose input sequence\n"
" is a prefix of the input sequence of an extension mapping\n");
ucm_printMapping(base, mb, stderr);
ucm_printMapping(ext, me, stderr);
result|=HAS_ERRORS;
}
}
++b;
} else if(cmp==0) {
/*
* same output: remove the extension mapping,
* otherwise treat as an error
*/
if( mb->f==me->f && mb->uLen==me->uLen &&
0==uprv_memcmp(UCM_GET_CODE_POINTS(base, mb), UCM_GET_CODE_POINTS(ext, me), 4*mb->uLen)
) {
me->moveFlag|=UCM_REMOVE_MAPPING;
result|=NEEDS_MOVE;
} else if(intersectBase) {
/* mapping in base but not in ext, move it */
mb->moveFlag|=UCM_MOVE_TO_EXT;
result|=NEEDS_MOVE;
} else {
fprintf(stderr,
"ucm error: the base table contains a mapping whose input sequence\n"
" is the same as the input sequence of an extension mapping\n"
" but it maps differently\n");
ucm_printMapping(base, mb, stderr);
ucm_printMapping(ext, me, stderr);
result|=HAS_ERRORS;
}
++b;
} else /* cmp>0 */ {
++e;
}
}
}
static uint8_t
checkBaseExtUnicode(UCMStates *baseStates, UCMTable *base, UCMTable *ext,
UBool moveToExt, UBool intersectBase) {
(void)baseStates;
UCMapping *mb, *me, *mbLimit, *meLimit;
int32_t cmp;
uint8_t result;
mb=base->mappings;
mbLimit=mb+base->mappingsLength;
me=ext->mappings;
meLimit=me+ext->mappingsLength;
result=0;
for(;;) {
/* skip irrelevant mappings on both sides */
for(;;) {
if(mb==mbLimit) {
return result;
}
if((0<=mb->f && mb->f<=2) || mb->f==4) {
break;
}
++mb;
}
for(;;) {
if(me==meLimit) {
return result;
}
if((0<=me->f && me->f<=2) || me->f==4) {
break;
}
++me;
}
/* compare the base and extension mappings */
cmp=compareUnicode(base, mb, ext, me);
if(cmp<0) {
if(intersectBase && (intersectBase!=2 || mb->bLen>1)) {
/*
* mapping in base but not in ext, move it
*
* if ext is DBCS, move DBCS mappings here
* and check SBCS ones for Unicode prefix below
*/
mb->moveFlag|=UCM_MOVE_TO_EXT;
result|=NEEDS_MOVE;
/* does mb map from an input sequence that is a prefix of me's? */
} else if( mb->uLen<me->uLen &&
0==uprv_memcmp(UCM_GET_CODE_POINTS(base, mb), UCM_GET_CODE_POINTS(ext, me), 4*mb->uLen)
) {
if(moveToExt) {
/* mark this mapping to be moved to the extension table */
mb->moveFlag|=UCM_MOVE_TO_EXT;
result|=NEEDS_MOVE;
} else {
fprintf(stderr,
"ucm error: the base table contains a mapping whose input sequence\n"
" is a prefix of the input sequence of an extension mapping\n");
ucm_printMapping(base, mb, stderr);
ucm_printMapping(ext, me, stderr);
result|=HAS_ERRORS;
}
}
++mb;
} else if(cmp==0) {
/*
* same output: remove the extension mapping,
* otherwise treat as an error
*/
if( mb->f==me->f && mb->bLen==me->bLen &&
0==uprv_memcmp(UCM_GET_BYTES(base, mb), UCM_GET_BYTES(ext, me), mb->bLen)
) {
me->moveFlag|=UCM_REMOVE_MAPPING;
result|=NEEDS_MOVE;
} else if(intersectBase) {
/* mapping in base but not in ext, move it */
mb->moveFlag|=UCM_MOVE_TO_EXT;
result|=NEEDS_MOVE;
} else {
fprintf(stderr,
"ucm error: the base table contains a mapping whose input sequence\n"
" is the same as the input sequence of an extension mapping\n"
" but it maps differently\n");
ucm_printMapping(base, mb, stderr);
ucm_printMapping(ext, me, stderr);
result|=HAS_ERRORS;
}
++mb;
} else /* cmp>0 */ {
++me;
}
}
}
static uint32_t
getFromUBytesValue(CnvExtData *extData, UCMTable *table, UCMapping *m) {
uint8_t *bytes, *resultBytes;
uint32_t value;
int32_t u16Length, ratio;
if(m->f==2) {
/*
* no mapping, <subchar1> preferred
*
* no need to count in statistics because the subchars are already
* counted for maxOutBytes and maxBytesPerUChar in UConverterStaticData,
* and this non-mapping does not count for maxInUChars which are always
* trivially at least two if counting unmappable supplementary code points
*/
return UCNV_EXT_FROM_U_SUBCHAR1;
}
bytes=UCM_GET_BYTES(table, m);
value=0;
switch(m->bLen) {
/* 1..3: store the bytes in the value word */
case 3:
value=((uint32_t)*bytes++)<<16;
case 2:
value|=((uint32_t)*bytes++)<<8;
case 1:
value|=*bytes;
break;
default:
/* the parser enforces m->bLen<=UCNV_EXT_MAX_BYTES */
/* store the bytes in fromUBytes[] and the index in the value word */
value=(uint32_t)utm_countItems(extData->fromUBytes);
resultBytes=utm_allocN(extData->fromUBytes, m->bLen);
uprv_memcpy(resultBytes, bytes, m->bLen);
break;
}
value|=(uint32_t)m->bLen<<UCNV_EXT_FROM_U_LENGTH_SHIFT;
if(m->f==0) {
value|=UCNV_EXT_FROM_U_ROUNDTRIP_FLAG;
}
/* calculate the real UTF-16 length (see recoding in prepareFromUMappings()) */
if(m->uLen==1) {
u16Length=U16_LENGTH(m->u);
} else {
u16Length=U16_LENGTH(UCM_GET_CODE_POINTS(table, m)[0])+(m->uLen-2);
}
/* update statistics */
if(u16Length>extData->maxInUChars) {
extData->maxInUChars=u16Length;
}
if(m->bLen>extData->maxOutBytes) {
extData->maxOutBytes=m->bLen;
}
ratio=(m->bLen+(u16Length-1))/u16Length;
if(ratio>extData->maxBytesPerUChar) {
extData->maxBytesPerUChar=ratio;
}
return value;
}
/*
* Recursive toUTable generator core function.
* Preconditions:
* - start<limit (There is at least one mapping.)
* - The mappings are sorted lexically. (Access is through the reverseMap.)
* - All mappings between start and limit have input sequences that share
* the same prefix of unitIndex length, and therefore all of these sequences
* are at least unitIndex+1 long.
* - There are only relevant mappings available through the reverseMap,
* see reduceToUMappings().
*
* One function invocation generates one section table.
*
* Steps:
* 1. Count the number of unique unit values and get the low/high unit values
* that occur at unitIndex.
* 2. Allocate the section table with possible optimization for linear access.
* 3. Write temporary version of the section table with start indexes of
* subsections, each corresponding to one unit value at unitIndex.
* 4. Iterate through the table once more, and depending on the subsection length:
* 0: write 0 as a result value (unused byte in linear-access section table)
* >0: if there is one mapping with an input unit sequence of unitIndex+1
* then defaultValue=compute the mapping result for this whole sequence
* else defaultValue=0
*
* recurse into the subsection
*/
static UBool
generateToUTable(CnvExtData *extData, UCMTable *table,
int32_t start, int32_t limit, int32_t unitIndex,
uint32_t defaultValue) {
UCMapping *mappings, *m;
int32_t *map;
int32_t i, j, uniqueCount, count, subStart, subLimit;
uint8_t *bytes;
int32_t low, high, prev;
uint32_t *section;
mappings=table->mappings;
map=table->reverseMap;
/* step 1: examine the input units; set low, high, uniqueCount */
m=mappings+map[start];
bytes=UCM_GET_BYTES(table, m);
low=bytes[unitIndex];
uniqueCount=1;
prev=high=low;
for(i=start+1; i<limit; ++i) {
m=mappings+map[i];
bytes=UCM_GET_BYTES(table, m);
high=bytes[unitIndex];
if(high!=prev) {
prev=high;
++uniqueCount;
}
}
/* step 2: allocate the section; set count, section */
count=(high-low)+1;
if(unitIndex==0 || uniqueCount>=(3*count)/4) {
/*
* for the root table and for fairly full tables:
* allocate for direct, linear array access
* by keeping count, to write an entry for each unit value
* from low to high
*/
} else {
count=uniqueCount;
}
/* allocate the section: 1 entry for the header + count for the items */
section=(uint32_t *)utm_allocN(extData->toUTable, 1+count);
/* write the section header */
*section++=((uint32_t)count<<UCNV_EXT_TO_U_BYTE_SHIFT)|defaultValue;
/* step 3: write temporary section table with subsection starts */
prev=low-1; /* just before low to prevent empty subsections before low */
j=0; /* section table index */
for(i=start; i<limit; ++i) {
m=mappings+map[i];
bytes=UCM_GET_BYTES(table, m);
high=bytes[unitIndex];
if(high!=prev) {
/* start of a new subsection for unit high */
if(count>uniqueCount) {
/* write empty subsections for unused units in a linear table */
while(++prev<high) {
section[j++]=((uint32_t)prev<<UCNV_EXT_TO_U_BYTE_SHIFT)|(uint32_t)i;
}
} else {
prev=high;
}
/* write the entry with the subsection start */
section[j++]=((uint32_t)high<<UCNV_EXT_TO_U_BYTE_SHIFT)|(uint32_t)i;
}
}
/* assert(j==count) */
/* step 4: recurse and write results */
subLimit=UCNV_EXT_TO_U_GET_VALUE(section[0]);
for(j=0; j<count; ++j) {
subStart=subLimit;
subLimit= (j+1)<count ? UCNV_EXT_TO_U_GET_VALUE(section[j+1]) : limit;
/* remove the subStart temporary value */
section[j]&=~UCNV_EXT_TO_U_VALUE_MASK;
if(subStart==subLimit) {
/* leave the value zero: empty subsection for unused unit in a linear table */
continue;
}
/* see if there is exactly one input unit sequence of length unitIndex+1 */
defaultValue=0;
m=mappings+map[subStart];
if(m->bLen==unitIndex+1) {
/* do not include this in generateToUTable() */
++subStart;
if(subStart<subLimit && mappings[map[subStart]].bLen==unitIndex+1) {
/* print error for multiple same-input-sequence mappings */
fprintf(stderr, "error: multiple mappings from same bytes\n");
ucm_printMapping(table, m, stderr);
ucm_printMapping(table, mappings+map[subStart], stderr);
return FALSE;
}
defaultValue=getToUnicodeValue(extData, table, m);
}
if(subStart==subLimit) {
/* write the result for the input sequence ending here */
section[j]|=defaultValue;
} else {
/* write the index to the subsection table */
section[j]|=(uint32_t)utm_countItems(extData->toUTable);
/* recurse */
if(!generateToUTable(extData, table, subStart, subLimit, unitIndex+1, defaultValue)) {
return FALSE;
}
}
}
return TRUE;
}