644 lines
22 KiB
C
644 lines
22 KiB
C
/*
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******************************************************************************
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*
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* Copyright (C) 2000-2011, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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******************************************************************************
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* file name: ubidiwrt.c
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 1999aug06
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* created by: Markus W. Scherer, updated by Matitiahu Allouche
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*
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* This file contains implementations for BiDi functions that use
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* the core algorithm and core API to write reordered text.
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*/
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/* set import/export definitions */
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#ifndef U_COMMON_IMPLEMENTATION
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# define U_COMMON_IMPLEMENTATION
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#endif
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#include "unicode/utypes.h"
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#include "unicode/ustring.h"
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#include "unicode/uchar.h"
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#include "unicode/ubidi.h"
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#include "unicode/utf16.h"
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#include "cmemory.h"
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#include "ustr_imp.h"
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#include "ubidiimp.h"
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/*
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* The function implementations in this file are designed
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* for UTF-16 and UTF-32, not for UTF-8.
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*
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* Assumptions that are not true for UTF-8:
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* - Any code point always needs the same number of code units
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* ("minimum-length-problem" of UTF-8)
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* - The BiDi control characters need only one code unit each
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*
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* Further assumptions for all UTFs:
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* - u_charMirror(c) needs the same number of code units as c
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*/
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#if UTF_SIZE==8
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# error reimplement ubidi_writeReordered() for UTF-8, see comment above
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#endif
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#define IS_COMBINING(type) ((1UL<<(type))&(1UL<<U_NON_SPACING_MARK|1UL<<U_COMBINING_SPACING_MARK|1UL<<U_ENCLOSING_MARK))
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/*
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* When we have UBIDI_OUTPUT_REVERSE set on ubidi_writeReordered(), then we
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* semantically write RTL runs in reverse and later reverse them again.
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* Instead, we actually write them in forward order to begin with.
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* However, if the RTL run was to be mirrored, we need to mirror here now
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* since the implicit second reversal must not do it.
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* It looks strange to do mirroring in LTR output, but it is only because
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* we are writing RTL output in reverse.
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*/
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static int32_t
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doWriteForward(const UChar *src, int32_t srcLength,
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UChar *dest, int32_t destSize,
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uint16_t options,
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UErrorCode *pErrorCode) {
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/* optimize for several combinations of options */
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switch(options&(UBIDI_REMOVE_BIDI_CONTROLS|UBIDI_DO_MIRRORING)) {
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case 0: {
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/* simply copy the LTR run to the destination */
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int32_t length=srcLength;
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if(destSize<length) {
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*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
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return srcLength;
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}
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do {
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*dest++=*src++;
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} while(--length>0);
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return srcLength;
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}
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case UBIDI_DO_MIRRORING: {
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/* do mirroring */
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int32_t i=0, j=0;
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UChar32 c;
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if(destSize<srcLength) {
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*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
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return srcLength;
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}
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do {
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U16_NEXT(src, i, srcLength, c);
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c=u_charMirror(c);
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U16_APPEND_UNSAFE(dest, j, c);
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} while(i<srcLength);
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return srcLength;
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}
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case UBIDI_REMOVE_BIDI_CONTROLS: {
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/* copy the LTR run and remove any BiDi control characters */
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int32_t remaining=destSize;
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UChar c;
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do {
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c=*src++;
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if(!IS_BIDI_CONTROL_CHAR(c)) {
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if(--remaining<0) {
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*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
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/* preflight the length */
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while(--srcLength>0) {
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c=*src++;
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if(!IS_BIDI_CONTROL_CHAR(c)) {
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--remaining;
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}
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}
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return destSize-remaining;
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}
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*dest++=c;
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}
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} while(--srcLength>0);
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return destSize-remaining;
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}
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default: {
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/* remove BiDi control characters and do mirroring */
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int32_t remaining=destSize;
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int32_t i, j=0;
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UChar32 c;
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do {
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i=0;
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U16_NEXT(src, i, srcLength, c);
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src+=i;
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srcLength-=i;
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if(!IS_BIDI_CONTROL_CHAR(c)) {
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remaining-=i;
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if(remaining<0) {
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*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
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/* preflight the length */
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while(srcLength>0) {
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c=*src++;
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if(!IS_BIDI_CONTROL_CHAR(c)) {
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--remaining;
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}
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--srcLength;
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}
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return destSize-remaining;
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}
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c=u_charMirror(c);
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U16_APPEND_UNSAFE(dest, j, c);
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}
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} while(srcLength>0);
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return j;
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}
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} /* end of switch */
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}
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static int32_t
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doWriteReverse(const UChar *src, int32_t srcLength,
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UChar *dest, int32_t destSize,
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uint16_t options,
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UErrorCode *pErrorCode) {
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/*
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* RTL run -
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*
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* RTL runs need to be copied to the destination in reverse order
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* of code points, not code units, to keep Unicode characters intact.
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*
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* The general strategy for this is to read the source text
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* in backward order, collect all code units for a code point
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* (and optionally following combining characters, see below),
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* and copy all these code units in ascending order
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* to the destination for this run.
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*
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* Several options request whether combining characters
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* should be kept after their base characters,
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* whether BiDi control characters should be removed, and
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* whether characters should be replaced by their mirror-image
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* equivalent Unicode characters.
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*/
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int32_t i, j;
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UChar32 c;
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/* optimize for several combinations of options */
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switch(options&(UBIDI_REMOVE_BIDI_CONTROLS|UBIDI_DO_MIRRORING|UBIDI_KEEP_BASE_COMBINING)) {
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case 0:
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/*
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* With none of the "complicated" options set, the destination
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* run will have the same length as the source run,
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* and there is no mirroring and no keeping combining characters
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* with their base characters.
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*/
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if(destSize<srcLength) {
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*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
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return srcLength;
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}
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destSize=srcLength;
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/* preserve character integrity */
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do {
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/* i is always after the last code unit known to need to be kept in this segment */
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i=srcLength;
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/* collect code units for one base character */
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U16_BACK_1(src, 0, srcLength);
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/* copy this base character */
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j=srcLength;
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do {
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*dest++=src[j++];
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} while(j<i);
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} while(srcLength>0);
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break;
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case UBIDI_KEEP_BASE_COMBINING:
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/*
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* Here, too, the destination
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* run will have the same length as the source run,
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* and there is no mirroring.
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* We do need to keep combining characters with their base characters.
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*/
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if(destSize<srcLength) {
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*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
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return srcLength;
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}
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destSize=srcLength;
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/* preserve character integrity */
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do {
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/* i is always after the last code unit known to need to be kept in this segment */
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i=srcLength;
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/* collect code units and modifier letters for one base character */
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do {
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U16_PREV(src, 0, srcLength, c);
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} while(srcLength>0 && IS_COMBINING(u_charType(c)));
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/* copy this "user character" */
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j=srcLength;
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do {
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*dest++=src[j++];
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} while(j<i);
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} while(srcLength>0);
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break;
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default:
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/*
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* With several "complicated" options set, this is the most
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* general and the slowest copying of an RTL run.
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* We will do mirroring, remove BiDi controls, and
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* keep combining characters with their base characters
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* as requested.
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*/
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if(!(options&UBIDI_REMOVE_BIDI_CONTROLS)) {
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i=srcLength;
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} else {
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/* we need to find out the destination length of the run,
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which will not include the BiDi control characters */
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int32_t length=srcLength;
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UChar ch;
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i=0;
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do {
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ch=*src++;
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if(!IS_BIDI_CONTROL_CHAR(ch)) {
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++i;
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}
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} while(--length>0);
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src-=srcLength;
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}
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if(destSize<i) {
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*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
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return i;
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}
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destSize=i;
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/* preserve character integrity */
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do {
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/* i is always after the last code unit known to need to be kept in this segment */
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i=srcLength;
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/* collect code units for one base character */
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U16_PREV(src, 0, srcLength, c);
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if(options&UBIDI_KEEP_BASE_COMBINING) {
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/* collect modifier letters for this base character */
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while(srcLength>0 && IS_COMBINING(u_charType(c))) {
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U16_PREV(src, 0, srcLength, c);
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}
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}
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if(options&UBIDI_REMOVE_BIDI_CONTROLS && IS_BIDI_CONTROL_CHAR(c)) {
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/* do not copy this BiDi control character */
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continue;
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}
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/* copy this "user character" */
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j=srcLength;
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if(options&UBIDI_DO_MIRRORING) {
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/* mirror only the base character */
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int32_t k=0;
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c=u_charMirror(c);
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U16_APPEND_UNSAFE(dest, k, c);
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dest+=k;
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j+=k;
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}
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while(j<i) {
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*dest++=src[j++];
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}
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} while(srcLength>0);
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break;
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} /* end of switch */
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return destSize;
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}
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U_CAPI int32_t U_EXPORT2
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ubidi_writeReverse(const UChar *src, int32_t srcLength,
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UChar *dest, int32_t destSize,
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uint16_t options,
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UErrorCode *pErrorCode) {
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int32_t destLength;
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if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
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return 0;
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}
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/* more error checking */
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if( src==NULL || srcLength<-1 ||
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destSize<0 || (destSize>0 && dest==NULL))
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{
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*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
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return 0;
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}
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/* do input and output overlap? */
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if( dest!=NULL &&
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((src>=dest && src<dest+destSize) ||
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(dest>=src && dest<src+srcLength)))
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{
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*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
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return 0;
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}
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if(srcLength==-1) {
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srcLength=u_strlen(src);
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}
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if(srcLength>0) {
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destLength=doWriteReverse(src, srcLength, dest, destSize, options, pErrorCode);
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} else {
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/* nothing to do */
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destLength=0;
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}
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return u_terminateUChars(dest, destSize, destLength, pErrorCode);
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}
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U_CAPI int32_t U_EXPORT2
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ubidi_writeReordered(UBiDi *pBiDi,
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UChar *dest, int32_t destSize,
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uint16_t options,
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UErrorCode *pErrorCode) {
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const UChar *text;
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UChar *saveDest;
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int32_t length, destCapacity;
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int32_t run, runCount, logicalStart, runLength;
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if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
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return 0;
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}
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/* more error checking */
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if( pBiDi==NULL ||
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(text=pBiDi->text)==NULL || (length=pBiDi->length)<0 ||
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destSize<0 || (destSize>0 && dest==NULL))
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{
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*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
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return 0;
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}
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/* do input and output overlap? */
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if( dest!=NULL &&
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((text>=dest && text<dest+destSize) ||
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(dest>=text && dest<text+pBiDi->originalLength)))
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{
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*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
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return 0;
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}
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if(length==0) {
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/* nothing to do */
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return u_terminateUChars(dest, destSize, 0, pErrorCode);
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}
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runCount=ubidi_countRuns(pBiDi, pErrorCode);
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if(U_FAILURE(*pErrorCode)) {
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return 0;
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}
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/* destSize shrinks, later destination length=destCapacity-destSize */
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saveDest=dest;
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destCapacity=destSize;
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/*
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* Option "insert marks" implies UBIDI_INSERT_LRM_FOR_NUMERIC if the
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* reordering mode (checked below) is appropriate.
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*/
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if(pBiDi->reorderingOptions & UBIDI_OPTION_INSERT_MARKS) {
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options|=UBIDI_INSERT_LRM_FOR_NUMERIC;
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options&=~UBIDI_REMOVE_BIDI_CONTROLS;
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}
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/*
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* Option "remove controls" implies UBIDI_REMOVE_BIDI_CONTROLS
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* and cancels UBIDI_INSERT_LRM_FOR_NUMERIC.
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*/
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if(pBiDi->reorderingOptions & UBIDI_OPTION_REMOVE_CONTROLS) {
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options|=UBIDI_REMOVE_BIDI_CONTROLS;
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options&=~UBIDI_INSERT_LRM_FOR_NUMERIC;
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}
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/*
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* If we do not perform the "inverse BiDi" algorithm, then we
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* don't need to insert any LRMs, and don't need to test for it.
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*/
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if((pBiDi->reorderingMode != UBIDI_REORDER_INVERSE_NUMBERS_AS_L) &&
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(pBiDi->reorderingMode != UBIDI_REORDER_INVERSE_LIKE_DIRECT) &&
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(pBiDi->reorderingMode != UBIDI_REORDER_INVERSE_FOR_NUMBERS_SPECIAL) &&
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(pBiDi->reorderingMode != UBIDI_REORDER_RUNS_ONLY)) {
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options&=~UBIDI_INSERT_LRM_FOR_NUMERIC;
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}
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/*
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* Iterate through all visual runs and copy the run text segments to
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* the destination, according to the options.
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*
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* The tests for where to insert LRMs ignore the fact that there may be
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* BN codes or non-BMP code points at the beginning and end of a run;
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* they may insert LRMs unnecessarily but the tests are faster this way
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* (this would have to be improved for UTF-8).
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*
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* Note that the only errors that are set by doWriteXY() are buffer overflow
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* errors. Ignore them until the end, and continue for preflighting.
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*/
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if(!(options&UBIDI_OUTPUT_REVERSE)) {
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/* forward output */
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if(!(options&UBIDI_INSERT_LRM_FOR_NUMERIC)) {
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/* do not insert BiDi controls */
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for(run=0; run<runCount; ++run) {
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if(UBIDI_LTR==ubidi_getVisualRun(pBiDi, run, &logicalStart, &runLength)) {
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runLength=doWriteForward(text+logicalStart, runLength,
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dest, destSize,
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(uint16_t)(options&~UBIDI_DO_MIRRORING), pErrorCode);
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} else {
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runLength=doWriteReverse(text+logicalStart, runLength,
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dest, destSize,
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options, pErrorCode);
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}
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if(dest!=NULL) {
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dest+=runLength;
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}
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destSize-=runLength;
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}
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} else {
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/* insert BiDi controls for "inverse BiDi" */
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const DirProp *dirProps=pBiDi->dirProps;
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const UChar *src;
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UChar uc;
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UBiDiDirection dir;
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int32_t markFlag;
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for(run=0; run<runCount; ++run) {
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dir=ubidi_getVisualRun(pBiDi, run, &logicalStart, &runLength);
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src=text+logicalStart;
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/* check if something relevant in insertPoints */
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markFlag=pBiDi->runs[run].insertRemove;
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if(markFlag<0) { /* BiDi controls count */
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markFlag=0;
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}
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if(UBIDI_LTR==dir) {
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if((pBiDi->isInverse) &&
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(/*run>0 &&*/ dirProps[logicalStart]!=L)) {
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markFlag |= LRM_BEFORE;
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}
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if (markFlag & LRM_BEFORE) {
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uc=LRM_CHAR;
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}
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else if (markFlag & RLM_BEFORE) {
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uc=RLM_CHAR;
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}
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else uc=0;
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if(uc) {
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if(destSize>0) {
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*dest++=uc;
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}
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--destSize;
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}
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runLength=doWriteForward(src, runLength,
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dest, destSize,
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(uint16_t)(options&~UBIDI_DO_MIRRORING), pErrorCode);
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if(dest!=NULL) {
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dest+=runLength;
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}
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destSize-=runLength;
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if((pBiDi->isInverse) &&
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(/*run<runCount-1 &&*/ dirProps[logicalStart+runLength-1]!=L)) {
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markFlag |= LRM_AFTER;
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}
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if (markFlag & LRM_AFTER) {
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uc=LRM_CHAR;
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}
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else if (markFlag & RLM_AFTER) {
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uc=RLM_CHAR;
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}
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else uc=0;
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if(uc) {
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if(destSize>0) {
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*dest++=uc;
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}
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--destSize;
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}
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} else { /* RTL run */
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if((pBiDi->isInverse) &&
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(/*run>0 &&*/ !(MASK_R_AL&DIRPROP_FLAG(dirProps[logicalStart+runLength-1])))) {
|
|
markFlag |= RLM_BEFORE;
|
|
}
|
|
if (markFlag & LRM_BEFORE) {
|
|
uc=LRM_CHAR;
|
|
}
|
|
else if (markFlag & RLM_BEFORE) {
|
|
uc=RLM_CHAR;
|
|
}
|
|
else uc=0;
|
|
if(uc) {
|
|
if(destSize>0) {
|
|
*dest++=uc;
|
|
}
|
|
--destSize;
|
|
}
|
|
|
|
runLength=doWriteReverse(src, runLength,
|
|
dest, destSize,
|
|
options, pErrorCode);
|
|
if(dest!=NULL) {
|
|
dest+=runLength;
|
|
}
|
|
destSize-=runLength;
|
|
|
|
if((pBiDi->isInverse) &&
|
|
(/*run<runCount-1 &&*/ !(MASK_R_AL&DIRPROP_FLAG(dirProps[logicalStart])))) {
|
|
markFlag |= RLM_AFTER;
|
|
}
|
|
if (markFlag & LRM_AFTER) {
|
|
uc=LRM_CHAR;
|
|
}
|
|
else if (markFlag & RLM_AFTER) {
|
|
uc=RLM_CHAR;
|
|
}
|
|
else uc=0;
|
|
if(uc) {
|
|
if(destSize>0) {
|
|
*dest++=uc;
|
|
}
|
|
--destSize;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
/* reverse output */
|
|
if(!(options&UBIDI_INSERT_LRM_FOR_NUMERIC)) {
|
|
/* do not insert BiDi controls */
|
|
for(run=runCount; --run>=0;) {
|
|
if(UBIDI_LTR==ubidi_getVisualRun(pBiDi, run, &logicalStart, &runLength)) {
|
|
runLength=doWriteReverse(text+logicalStart, runLength,
|
|
dest, destSize,
|
|
(uint16_t)(options&~UBIDI_DO_MIRRORING), pErrorCode);
|
|
} else {
|
|
runLength=doWriteForward(text+logicalStart, runLength,
|
|
dest, destSize,
|
|
options, pErrorCode);
|
|
}
|
|
if(dest!=NULL) {
|
|
dest+=runLength;
|
|
}
|
|
destSize-=runLength;
|
|
}
|
|
} else {
|
|
/* insert BiDi controls for "inverse BiDi" */
|
|
const DirProp *dirProps=pBiDi->dirProps;
|
|
const UChar *src;
|
|
UBiDiDirection dir;
|
|
|
|
for(run=runCount; --run>=0;) {
|
|
/* reverse output */
|
|
dir=ubidi_getVisualRun(pBiDi, run, &logicalStart, &runLength);
|
|
src=text+logicalStart;
|
|
|
|
if(UBIDI_LTR==dir) {
|
|
if(/*run<runCount-1 &&*/ dirProps[logicalStart+runLength-1]!=L) {
|
|
if(destSize>0) {
|
|
*dest++=LRM_CHAR;
|
|
}
|
|
--destSize;
|
|
}
|
|
|
|
runLength=doWriteReverse(src, runLength,
|
|
dest, destSize,
|
|
(uint16_t)(options&~UBIDI_DO_MIRRORING), pErrorCode);
|
|
if(dest!=NULL) {
|
|
dest+=runLength;
|
|
}
|
|
destSize-=runLength;
|
|
|
|
if(/*run>0 &&*/ dirProps[logicalStart]!=L) {
|
|
if(destSize>0) {
|
|
*dest++=LRM_CHAR;
|
|
}
|
|
--destSize;
|
|
}
|
|
} else {
|
|
if(/*run<runCount-1 &&*/ !(MASK_R_AL&DIRPROP_FLAG(dirProps[logicalStart]))) {
|
|
if(destSize>0) {
|
|
*dest++=RLM_CHAR;
|
|
}
|
|
--destSize;
|
|
}
|
|
|
|
runLength=doWriteForward(src, runLength,
|
|
dest, destSize,
|
|
options, pErrorCode);
|
|
if(dest!=NULL) {
|
|
dest+=runLength;
|
|
}
|
|
destSize-=runLength;
|
|
|
|
if(/*run>0 &&*/ !(MASK_R_AL&DIRPROP_FLAG(dirProps[logicalStart+runLength-1]))) {
|
|
if(destSize>0) {
|
|
*dest++=RLM_CHAR;
|
|
}
|
|
--destSize;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return u_terminateUChars(saveDest, destCapacity, destCapacity-destSize, pErrorCode);
|
|
}
|