UChar32
UCharCharacterIterator::setIndex32(int32_t position)
{
if (position < begin)
{
position = begin;
}
else if (position > end)
{
position = end;
}
if (position < end)
{
UTF_SET_CHAR_START(text, begin, position);
int32_t i = this->pos = position;
UChar32 c;
UTF_NEXT_CHAR(text, i, end, c);
return c;
}
else
{
this->pos = position;
return DONE;
}
}
UChar32
UCharCharacterIterator::next32PostInc() {
if (pos < end) {
UChar32 c;
UTF_NEXT_CHAR(text, pos, end, c);
return c;
} else {
return DONE;
}
}
UChar32
UCharCharacterIterator::first32() {
pos = begin;
if(pos < end) {
int32_t i = pos;
UChar32 c;
UTF_NEXT_CHAR(text, i, end, c);
return c;
} else {
return DONE;
}
}
/**
* Encode a UTF-16 string in BOCU-1.
* Does not check for overflows, but otherwise useful function.
*
* @param s input UTF-16 string
* @param length number of UChar code units in s
* @param p pointer to output byte array
* @return number of bytes output
*/
static int32_t
writeString(const UChar *s, int32_t length, uint8_t *p) {
uint8_t *p0;
int32_t c, prev, i;
prev=0;
p0=p;
i=0;
while(i<length) {
UTF_NEXT_CHAR(s, i, length, c);
p+=writePacked(encodeBocu1(&prev, c), p);
}
return (int32_t)(p-p0);
}
UChar32
UCharCharacterIterator::next32() {
if (pos < end) {
UTF_FWD_1(text, pos, end);
if(pos < end) {
int32_t i = pos;
UChar32 c;
UTF_NEXT_CHAR(text, i, end, c);
return c;
}
}
/* make current() return DONE */
pos = end;
return DONE;
}
/*
* When we have UBIDI_OUTPUT_REVERSE set on ubidi_writeReordered(), then we
* semantically write RTL runs in reverse and later reverse them again.
* Instead, we actually write them in forward order to begin with.
* However, if the RTL run was to be mirrored, we need to mirror here now
* since the implicit second reversal must not do it.
* It looks strange to do mirroring in LTR output, but it is only because
* we are writing RTL output in reverse.
*/
static int32_t
doWriteForward(const UChar *src, int32_t srcLength,
UChar *dest, int32_t destSize,
uint16_t options,
UErrorCode *pErrorCode) {
/* optimize for several combinations of options */
switch(options&(UBIDI_REMOVE_BIDI_CONTROLS|UBIDI_DO_MIRRORING)) {
case 0: {
/* simply copy the LTR run to the destination */
int32_t length=srcLength;
if(destSize<length) {
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
return srcLength;
}
do {
*dest++=*src++;
} while(--length>0);
return srcLength;
}
case UBIDI_DO_MIRRORING: {
/* do mirroring */
int32_t i=0, j=0;
UChar32 c;
if(destSize<srcLength) {
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
return srcLength;
}
do {
UTF_NEXT_CHAR(src, i, srcLength, c);
c=u_charMirror(c);
UTF_APPEND_CHAR_UNSAFE(dest, j, c);
} while(i<srcLength);
return srcLength;
}
case UBIDI_REMOVE_BIDI_CONTROLS: {
/* copy the LTR run and remove any BiDi control characters */
int32_t remaining=destSize;
UChar c;
do {
c=*src++;
if(!IS_BIDI_CONTROL_CHAR(c)) {
if(--remaining<0) {
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
/* preflight the length */
while(--srcLength>0) {
c=*src++;
if(!IS_BIDI_CONTROL_CHAR(c)) {
--remaining;
}
}
return destSize-remaining;
}
*dest++=c;
}
} while(--srcLength>0);
return destSize-remaining;
}
default: {
/* remove BiDi control characters and do mirroring */
int32_t remaining=destSize;
int32_t i, j=0;
UChar32 c;
do {
i=0;
UTF_NEXT_CHAR(src, i, srcLength, c);
src+=i;
srcLength-=i;
if(!IS_BIDI_CONTROL_CHAR(c)) {
remaining-=i;
if(remaining<0) {
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
/* preflight the length */
while(srcLength>0) {
c=*src++;
if(!IS_BIDI_CONTROL_CHAR(c)) {
--remaining;
}
--srcLength;
}
return destSize-remaining;
}
c=u_charMirror(c);
UTF_APPEND_CHAR_UNSAFE(dest, j, c);
}
} while(srcLength>0);
return j;
}
} /* end of switch */
}
