/* Note: Recursion may occur in the cb functions, be sure to update the offsets correctly
if you don't use ucnv_cbXXX functions. Make sure you don't use the same callback within
the same call stack if the complexity arises. */
U_CAPI void U_EXPORT2
ucnv_cbFromUWriteBytes (UConverterFromUnicodeArgs *args,
const char* source,
int32_t length,
int32_t offsetIndex,
UErrorCode * err)
{
if(U_FAILURE(*err)) {
return;
}
ucnv_fromUWriteBytes(
args->converter,
source, length,
&args->target, args->targetLimit,
&args->offsets, offsetIndex,
err);
}
static void
_UTF16BEFromUnicodeWithOffsets(UConverterFromUnicodeArgs *pArgs,
UErrorCode *pErrorCode) {
UConverter *cnv;
const UChar *source;
char *target;
int32_t *offsets;
uint32_t targetCapacity, length, sourceIndex;
UChar c, trail;
char overflow[4];
source=pArgs->source;
length=(int32_t)(pArgs->sourceLimit-source);
if(length<=0) {
/* no input, nothing to do */
return;
}
cnv=pArgs->converter;
/* write the BOM if necessary */
if(cnv->fromUnicodeStatus==UCNV_NEED_TO_WRITE_BOM) {
static const char bom[]={ (char)0xfe, (char)0xff };
ucnv_fromUWriteBytes(cnv,
bom, 2,
&pArgs->target, pArgs->targetLimit,
&pArgs->offsets, -1,
pErrorCode);
cnv->fromUnicodeStatus=0;
}
target=pArgs->target;
if(target >= pArgs->targetLimit) {
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
return;
}
targetCapacity=(uint32_t)(pArgs->targetLimit-target);
offsets=pArgs->offsets;
sourceIndex=0;
/* c!=0 indicates in several places outside the main loops that a surrogate was found */
if((c=(UChar)cnv->fromUChar32)!=0 && U16_IS_TRAIL(trail=*source) && targetCapacity>=4) {
/* the last buffer ended with a lead surrogate, output the surrogate pair */
++source;
--length;
target[0]=(uint8_t)(c>>8);
target[1]=(uint8_t)c;
target[2]=(uint8_t)(trail>>8);
target[3]=(uint8_t)trail;
target+=4;
targetCapacity-=4;
if(offsets!=NULL) {
*offsets++=-1;
*offsets++=-1;
*offsets++=-1;
*offsets++=-1;
}
sourceIndex=1;
cnv->fromUChar32=c=0;
}
