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ICU-2397 sample for a UCharIterator reading lenient 8-bit Unicode, mix of UTF-8 and CESU-8

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X-SVN-Rev: 10841
This commit is contained in:
Markus Scherer 2003-01-11 00:28:48 +00:00
parent d08ac9bbe1
commit 95e136cdd2
5 changed files with 976 additions and 0 deletions
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20
icu4c/source/samples/uciter8/Makefile Normal file
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# Copyright (c) 2003 IBM, Inc. and others
# sample code makefile
# Usage:
# - configure, build, install ICU (make install)
# - make sure "icu-config" (in the ICU installed bin directory) is on
# the path
# - do 'make' in this directory
# Name of your target
TARGET=uciter8
# All object files (C or C++)
OBJECTS=uciter8.o
# Load in standard makefile definitions
include ../defs.mk
# the actual rules (this is a simple sample)
include ../rules.mk

62
icu4c/source/samples/uciter8/readme.txt Normal file
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Copyright (c) 2003, International Business Machines Corporation and others. All Rights Reserved.
uciter8: Lenient reading of 8-bit Unicode with a UCharIterator
This sample demonstrates reading
8-bit Unicode text leniently, accepting a mix of UTF-8 and CESU-8
and also accepting single surrogates.
UTF-8-style macros are defined as well as a UCharIterator.
The macros are incomplete (do not assemble code points from pairs of surrogates)
but sufficient for the iterator.
Files:
uciter8.c Main source file in C
uciter8.dsw Windows MSVC workspace. Double-click this to get started.
uciter8.dsp Windows MSVC project file
To Build uciter8 on Windows
1. Install and build ICU
2. In MSVC, open the workspace file icu\samples\uciter8\uciter8.dsw
3. Choose a Debug or Release build.
4. Build.
To Run on Windows
1. Start a command shell window
2. Add ICU's bin directory to the path, e.g.
set PATH=c:\icu\bin;%PATH%
(Use the path to where ever ICU is on your system.)
3. cd into the uciter8 directory, e.g.
cd c:\icu\source\samples\uciter8\debug
4. Run it
uciter8
To Build on Unixes
1. Build ICU.
Specify an ICU install directory when running configure,
using the --prefix option. The steps to build ICU will look something
like this:
cd <icu directory>/source
runConfigureICU <platform-name> --prefix <icu install directory> [other options]
gmake all
2. Install ICU,
gmake install
3. Compile
cd <icu directory>/source/samples/uciter8
gmake ICU_PREFIX=<icu install directory)
To Run on Unixes
cd <icu directory>/source/samples/uciter8
gmake ICU_PREFIX=<icu install directory> check
-or-
export LD_LIBRARY_PATH=<icu install directory>/lib:.:$LD_LIBRARY_PATH
uciter8
Note: The name of the LD_LIBRARY_PATH variable is different on some systems.
If in doubt, run the sample using "gmake check", and note the name of
the variable that is used there. LD_LIBRARY_PATH is the correct name
for Linux and Solaris.

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icu4c/source/samples/uciter8/uciter8.c Normal file
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/*
*******************************************************************************
*
* Copyright (C) 2003, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: uciter8.c
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2003jan10
* created by: Markus W. Scherer
*
* This file contains sample code that illustrates reading
* 8-bit Unicode text leniently, accepting a mix of UTF-8 and CESU-8
* and also accepting single surrogates.
* UTF-8-style macros are defined as well as a UCharIterator.
* The macros are incomplete (do not assemble code points from pairs of
* surrogates, see comment below)
* but sufficient for the iterator.
*/
#include <stdio.h>
#include <string.h>
#include "unicode/utypes.h"
#include "unicode/uiter.h"
#define log_err printf
/* lenient UTF-8/CESU-8 macros ---------------------------------------------- */
/*
* This code leniently reads 8-bit Unicode strings,
* which could contain a mix of UTF-8 and CESU-8.
* More precisely:
* - supplementary code points may be encoded with dedicated 4-byte sequences
* (UTF-8 style)
* - supplementary code points may be encoded with
* pairs of 3-byte sequences, one for each surrogate of the UTF-16 form
* (CESU-8 style)
* - single surrogates are allowed, encoded with their "natural" 3-byte sequences
*
* Limitation:
* Right now, the macros do not attempt to assemble code points from pairs of
* separately encoded surrogates.
* This would not be sufficient for processing based on these macros,
* but it is sufficient for a UCharIterator that returns only UChars anyway.
*
* The code is copied and modified from utf_impl.c and utf8.h.
* The "strict" argument in the implementation functions is completely removed,
* using the "<0" branch from the original code.
* Checks for surrogate code points are removed for the leniency
* described above.
*/
static const UChar32
lenient8_minLegal[4]={ 0, 0x80, 0x800, 0x10000 };
static UChar32
lenient8_nextCharSafeBody(const uint8_t *s, int32_t *pi, int32_t length, UChar32 c) {
int32_t i=*pi;
uint8_t count=U8_COUNT_TRAIL_BYTES(c);
if((i)+count<=(length)) {
uint8_t trail, illegal=0;
U8_MASK_LEAD_BYTE((c), count);
/* count==0 for illegally leading trail bytes and the illegal bytes 0xfe and 0xff */
switch(count) {
/* each branch falls through to the next one */
case 5:
case 4:
/* count>=4 is always illegal: no more than 3 trail bytes in Unicode's UTF-8 */
illegal=1;
break;
case 3:
trail=s[(i)++];
(c)=((c)<<6)|(trail&0x3f);
if(c<0x110) {
illegal|=(trail&0xc0)^0x80;
} else {
/* code point>0x10ffff, outside Unicode */
illegal=1;
break;
}
case 2:
trail=s[(i)++];
(c)=((c)<<6)|(trail&0x3f);
illegal|=(trail&0xc0)^0x80;
case 1:
trail=s[(i)++];
(c)=((c)<<6)|(trail&0x3f);
illegal|=(trail&0xc0)^0x80;
break;
case 0:
return U_SENTINEL;
/* no default branch to optimize switch() - all values are covered */
}
/* correct sequence - all trail bytes have (b7..b6)==(10)? */
/* illegal is also set if count>=4 */
if(illegal || (c)<lenient8_minLegal[count]) {
/* error handling */
uint8_t errorCount=count;
/* don't go beyond this sequence */
i=*pi;
while(count>0 && U8_IS_TRAIL(s[i])) {
++(i);
--count;
}
c=U_SENTINEL;
}
} else /* too few bytes left */ {
/* error handling */
int32_t i0=i;
/* don't just set (i)=(length) in case there is an illegal sequence */
while((i)<(length) && U8_IS_TRAIL(s[i])) {
++(i);
}
c=U_SENTINEL;
}
*pi=i;
return c;
}
static UChar32
lenient8_prevCharSafeBody(const uint8_t *s, int32_t start, int32_t *pi, UChar32 c) {
int32_t i=*pi;
uint8_t b, count=1, shift=6;
/* extract value bits from the last trail byte */
c&=0x3f;
for(;;) {
if(i<=start) {
/* no lead byte at all */
return U_SENTINEL;
}
/* read another previous byte */
b=s[--i];
if((uint8_t)(b-0x80)<0x7e) { /* 0x80<=b<0xfe */
if(b&0x40) {
/* lead byte, this will always end the loop */
uint8_t shouldCount=U8_COUNT_TRAIL_BYTES(b);
if(count==shouldCount) {
/* set the new position */
*pi=i;
U8_MASK_LEAD_BYTE(b, count);
c|=(UChar32)b<<shift;
if(count>=4 || c>0x10ffff || c<lenient8_minLegal[count]) {
/* illegal sequence */
if(count>=4) {
count=3;
}
c=U_SENTINEL;
} else {
/* exit with correct c */
}
} else {
/* the lead byte does not match the number of trail bytes */
/* only set the position to the lead byte if it would
include the trail byte that we started with */
if(count<shouldCount) {
*pi=i;
}
c=U_SENTINEL;
}
break;
} else if(count<5) {
/* trail byte */
c|=(UChar32)(b&0x3f)<<shift;
++count;
shift+=6;
} else {
/* more than 5 trail bytes is illegal */
c=U_SENTINEL;
break;
}
} else {
/* single-byte character precedes trailing bytes */
c=U_SENTINEL;
break;
}
}
return c;
}
#define L8_NEXT(s, i, length, c) { \
(c)=(s)[(i)++]; \
if((c)>=0x80) { \
if(U8_IS_LEAD(c)) { \
(c)=lenient8_nextCharSafeBody(s, &(i), (int32_t)(length), c); \
} else { \
(c)=U_SENTINEL; \
} \
} \
}
#define L8_PREV(s, start, i, c) { \
(c)=(s)[--(i)]; \
if((c)>=0x80) { \
if((c)<=0xbf) { \
(c)=lenient8_prevCharSafeBody(s, start, &(i), c); \
} else { \
(c)=U_SENTINEL; \
} \
} \
}
/* lenient-8 UCharIterator -------------------------------------------------- */
/*
* This is a copy of the UTF-8 UCharIterator in uiter.cpp,
* except that it uses the lenient-8-bit-Unicode macros above.
*/
/*
* Minimal implementation:
* Maintain a single-UChar buffer for an additional surrogate.
* The caller must not modify start and limit because they are used internally.
*
* Use UCharIterator fields as follows:
* context pointer to UTF-8 string
* length UTF-16 length of the string; -1 until lazy evaluation
* start current UTF-8 index
* index current UTF-16 index
* limit UTF-8 length of the string
* reservedField supplementary code point
*
* Since UCharIterator delivers 16-bit code units, the iteration can be
* currently in the middle of the byte sequence for a supplementary code point.
* In this case, reservedField will contain that code point and start will
* point to after the corresponding byte sequence.
* Otherwise, reservedField will be 0.
*/
/*
* Possible optimization for NUL-terminated UTF-8 and UTF-16 strings:
* Add implementations that do not call strlen() for iteration but check for NUL.
*/
static int32_t U_CALLCONV
lenient8IteratorGetIndex(UCharIterator *iter, UCharIteratorOrigin origin) {
switch(origin) {
case UITER_ZERO:
case UITER_START:
return 0;
case UITER_CURRENT:
return iter->index;
case UITER_LIMIT:
case UITER_LENGTH:
if(iter->length<0) {
const uint8_t *s;
UChar32 c;
int32_t i, limit, length;
s=(const uint8_t *)iter->context;
i=iter->start;
limit=iter->limit;
length=iter->index;
if(iter->reservedField!=0) {
iter->reservedField=0;
++length;
}
while(i<limit) {
L8_NEXT(s, i, limit, c);
if(c<=0xffff) {
++length;
} else {
length+=2;
}
}
iter->length=length;
}
return iter->length;
default:
/* not a valid origin */
/* Should never get here! */
return -1;
}
}
static int32_t U_CALLCONV
lenient8IteratorMove(UCharIterator *iter, int32_t delta, UCharIteratorOrigin origin) {
const uint8_t *s;
UChar32 c;
int32_t pos; /* requested UTF-16 index */
int32_t i, limit; /* UTF-8 index & length */
/* calculate the requested UTF-16 position */
switch(origin) {
case UITER_ZERO:
case UITER_START:
pos=delta;
break;
case UITER_CURRENT:
pos=iter->index+delta;
break;
case UITER_LIMIT:
case UITER_LENGTH:
pos=lenient8IteratorGetIndex(iter, UITER_LENGTH)+delta;
break;
default:
return -1; /* Error */
}
/* shortcuts: pinning to the edges of the string */
if(pos<=0) {
iter->index=iter->start=iter->reservedField=0;
return 0;
} else if(iter->length>=0 && pos>=iter->length) {
iter->index=iter->length;
iter->start=iter->limit;
iter->reservedField=0;
return iter->index;
}
/* minimize the number of L8_NEXT/PREV operations */
if(pos<iter->index/2) {
/* go forward from the start instead of backward from the current index */
iter->index=iter->start=iter->reservedField=0;
} else if(iter->length>=0 && (iter->length-pos)<(pos-iter->index)) {
/*
* if we have the UTF-16 length and the new position is
* closer to the end than the current index,
* then go backward from the end instead of forward from the current index
*/
iter->index=iter->length;
iter->start=iter->limit;
iter->reservedField=0;
}
delta=pos-iter->index;
if(delta==0) {
return iter->index; /* nothing to do */
}
/* move towards the requested position if possible */
s=(const uint8_t *)iter->context;
pos=iter->index;
i=iter->start;
limit=iter->limit;
if(delta>0) {
/* go forward */
if(iter->reservedField!=0) {
iter->reservedField=0;
++pos;
--delta;
}
while(delta>0 && i<limit) {
L8_NEXT(s, i, limit, c);
if(c<0xffff) {
++pos;
--delta;
} else if(delta>=2) {
pos+=2;
delta-=2;
} else /* delta==1 */ {
/* stop in the middle of a supplementary code point */
iter->reservedField=c;
++pos;
break; /* delta=0; */
}
}
if(i==limit && iter->length<0) {
iter->length=pos;
}
} else /* delta<0 */ {
/* go backward */
if(iter->reservedField!=0) {
iter->reservedField=0;
--pos;
++delta;
}
while(delta<0 && i>0) {
L8_PREV(s, 0, i, c);
if(c<0xffff) {
--pos;
++delta;
} else if(delta<=-2) {
pos-=2;
delta+=2;
} else /* delta==-1 */ {
/* stop in the middle of a supplementary code point */
iter->reservedField=c;
--pos;
break; /* delta=0; */
}
}
}
iter->start=i;
return iter->index=pos;
}
static UBool U_CALLCONV
lenient8IteratorHasNext(UCharIterator *iter) {
return iter->reservedField!=0 || iter->start<iter->limit;
}
static UBool U_CALLCONV
lenient8IteratorHasPrevious(UCharIterator *iter) {
return iter->index>0;
}
static UChar32 U_CALLCONV
lenient8IteratorCurrent(UCharIterator *iter) {
if(iter->reservedField!=0) {
return U16_TRAIL(iter->reservedField);
} else if(iter->start<iter->limit) {
const uint8_t *s=(const uint8_t *)iter->context;
UChar32 c;
int32_t i=iter->start;
L8_NEXT(s, i, iter->limit, c);
if(c<0) {
return 0xfffd;
} else if(c<=0xffff) {
return c;
} else {
return U16_LEAD(c);
}
} else {
return U_SENTINEL;
}
}
static UChar32 U_CALLCONV
lenient8IteratorNext(UCharIterator *iter) {
if(iter->reservedField!=0) {
UChar trail=U16_TRAIL(iter->reservedField);
iter->reservedField=0;
++iter->index;
return trail;
} else if(iter->start<iter->limit) {
const uint8_t *s=(const uint8_t *)iter->context;
UChar32 c;
L8_NEXT(s, iter->start, iter->limit, c);
++iter->index;
if(iter->length<0 && iter->start==iter->limit) {
iter->length= c<=0xffff ? iter->index : iter->index+1;
}
if(c<0) {
return 0xfffd;
} else if(c<=0xffff) {
return c;
} else {
iter->reservedField=c;
return U16_LEAD(c);
}
} else {
return U_SENTINEL;
}
}
static UChar32 U_CALLCONV
lenient8IteratorPrevious(UCharIterator *iter) {
if(iter->reservedField!=0) {
UChar lead=U16_LEAD(iter->reservedField);
iter->reservedField=0;
iter->start-=4; /* we stayed behind the supplementary code point; go before it now */
--iter->index;
return lead;
} else if(iter->start>0) {
const uint8_t *s=(const uint8_t *)iter->context;
UChar32 c;
L8_PREV(s, 0, iter->start, c);
--iter->index;
if(c<0) {
return 0xfffd;
} else if(c<=0xffff) {
return c;
} else {
iter->start+=4; /* back to behind this supplementary code point for consistent state */
iter->reservedField=c;
return U16_TRAIL(c);
}
} else {
return U_SENTINEL;
}
}
static const UCharIterator lenient8Iterator={
0, 0, 0, 0, 0, 0,
lenient8IteratorGetIndex,
lenient8IteratorMove,
lenient8IteratorHasNext,
lenient8IteratorHasPrevious,
lenient8IteratorCurrent,
lenient8IteratorNext,
lenient8IteratorPrevious,
0
};
static void
uiter_setLenient8(UCharIterator *iter, const char *s, int32_t length) {
if(iter!=0) {
if(s!=0 && length>=-1) {
*iter=lenient8Iterator;
iter->context=s;
if(length>=0) {
iter->limit=length;
} else {
iter->limit=strlen(s);
}
iter->length= iter->limit==0 ? 0 : -1;
} else {
/* set no-op iterator */
uiter_setUTF8(iter, NULL, 0);
}
}
}
/* UCharIterator test ------------------------------------------------------- */
/*
* The following code is a copy of the UCharIterator test code in
* source/test/cintltst/custrtst.c,
* testing the lenient-8 iterator instead of the UTF-8 one.
*/
/*
* Compare results from two iterators, should be same.
* Assume that the text is not empty and that
* iteration start==0 and iteration limit==length.
*/
static void
compareIterators(UCharIterator *iter1, const char *n1,
UCharIterator *iter2, const char *n2) {
int32_t i, pos1, pos2, middle, length;
UChar32 c1, c2;
/* compare lengths */
length=iter1->getIndex(iter1, UITER_LENGTH);
pos2=iter2->getIndex(iter2, UITER_LENGTH);
if(length!=pos2) {
log_err("%s->getIndex(length)=%d != %d=%s->getIndex(length)\n", n1, length, pos2, n2);
return;
}
/* set into the middle */
middle=length/2;
pos1=iter1->move(iter1, middle, UITER_ZERO);
if(pos1!=middle) {
log_err("%s->move(from 0 to middle %d)=%d does not move to the middle\n", n1, middle, pos1);
return;
}
pos2=iter2->move(iter2, middle, UITER_ZERO);
if(pos2!=middle) {
log_err("%s->move(from 0 to middle %d)=%d does not move to the middle\n", n2, middle, pos2);
return;
}
/* test current() */
c1=iter1->current(iter1);
c2=iter2->current(iter2);
if(c1!=c2) {
log_err("%s->current()=U+%04x != U+%04x=%s->current() at middle=%d\n", n1, c1, c2, n2, middle);
return;
}
/* move forward 3 UChars */
for(i=0; i<3; ++i) {
c1=iter1->next(iter1);
c2=iter2->next(iter2);
if(c1!=c2) {
log_err("%s->next()=U+%04x != U+%04x=%s->next() at %d (started in middle)\n", n1, c1, c2, n2, iter1->getIndex(iter1, UITER_CURRENT));
return;
}
}
/* move backward 5 UChars */
for(i=0; i<5; ++i) {
c1=iter1->previous(iter1);
c2=iter2->previous(iter2);
if(c1!=c2) {
log_err("%s->previous()=U+%04x != U+%04x=%s->previous() at %d (started in middle)\n", n1, c1, c2, n2, iter1->getIndex(iter1, UITER_CURRENT));
return;
}
}
/* iterate forward from the beginning */
pos1=iter1->move(iter1, 0, UITER_START);
if(pos1<0) {
log_err("%s->move(start) failed\n", n1);
return;
}
if(!iter1->hasNext(iter1)) {
log_err("%s->hasNext() at the start returns FALSE\n", n1);
return;
}
pos2=iter2->move(iter2, 0, UITER_START);
if(pos2<0) {
log_err("%s->move(start) failed\n", n2);
return;
}
if(!iter2->hasNext(iter2)) {
log_err("%s->hasNext() at the start returns FALSE\n", n2);
return;
}
do {
c1=iter1->next(iter1);
c2=iter2->next(iter2);
if(c1!=c2) {
log_err("%s->next()=U+%04x != U+%04x=%s->next() at %d\n", n1, c1, c2, n2, iter1->getIndex(iter1, UITER_CURRENT));
return;
}
} while(c1>=0);
if(iter1->hasNext(iter1)) {
log_err("%s->hasNext() at the end returns TRUE\n", n1);
return;
}
if(iter2->hasNext(iter2)) {
log_err("%s->hasNext() at the end returns TRUE\n", n2);
return;
}
/* back to the middle */
pos1=iter1->move(iter1, middle, UITER_ZERO);
if(pos1!=middle) {
log_err("%s->move(from end to middle %d)=%d does not move to the middle\n", n1, middle, pos1);
return;
}
pos2=iter2->move(iter2, middle, UITER_ZERO);
if(pos2!=middle) {
log_err("%s->move(from end to middle %d)=%d does not move to the middle\n", n2, middle, pos2);
return;
}
/* move to index 1 */
pos1=iter1->move(iter1, 1, UITER_ZERO);
if(pos1!=1) {
log_err("%s->move(from middle %d to 1)=%d does not move to 1\n", n1, middle, pos1);
return;
}
pos2=iter2->move(iter2, 1, UITER_ZERO);
if(pos2!=1) {
log_err("%s->move(from middle %d to 1)=%d does not move to 1\n", n2, middle, pos2);
return;
}
/* iterate backward from the end */
pos1=iter1->move(iter1, 0, UITER_LIMIT);
if(pos1<0) {
log_err("%s->move(limit) failed\n", n1);
return;
}
if(!iter1->hasPrevious(iter1)) {
log_err("%s->hasPrevious() at the end returns FALSE\n", n1);
return;
}
pos2=iter2->move(iter2, 0, UITER_LIMIT);
if(pos2<0) {
log_err("%s->move(limit) failed\n", n2);
return;
}
if(!iter2->hasPrevious(iter2)) {
log_err("%s->hasPrevious() at the end returns FALSE\n", n2);
return;
}
do {
c1=iter1->previous(iter1);
c2=iter2->previous(iter2);
if(c1!=c2) {
log_err("%s->previous()=U+%04x != U+%04x=%s->previous() at %d\n", n1, c1, c2, n2, iter1->getIndex(iter1, UITER_CURRENT));
return;
}
} while(c1>=0);
if(iter1->hasPrevious(iter1)) {
log_err("%s->hasPrevious() at the start returns TRUE\n", n1);
return;
}
if(iter2->hasPrevious(iter2)) {
log_err("%s->hasPrevious() at the start returns TRUE\n", n2);
return;
}
}
static void
TestLenient8Iterator() {
static const UChar text[]={
0x61, 0x62, 0x63,
/* dffd 107fd d801 dffd - in UTF-16, U+107fd=<d801 dffd> */
0xdffd, 0xd801, 0xdffd, 0xd801, 0xdffd,
0x78, 0x79, 0x7a, 0
};
static const uint8_t bytes[]={
0x61, 0x62, 0x63,
/* dffd 107fd d801 dffd - mixture */
0xed, 0xbf, 0xbd, 0xf0, 0x90, 0x9f, 0xbd, 0xed, 0xa0, 0x81, 0xed, 0xbf, 0xbd,
0x78, 0x79, 0x7a, 0
};
UCharIterator iter1, iter2;
UChar32 c1, c2;
puts("test a UCharIterator for lenient 8-bit Unicode (accept single surrogates)");
/* compare the same string between UTF-16 and lenient-8 UCharIterators */
uiter_setString(&iter1, text, -1);
uiter_setLenient8(&iter2, (const char *)bytes, sizeof(bytes)-1);
compareIterators(&iter1, "UTF16Iterator", &iter2, "Lenient8Iterator");
/* try again with length=-1 */
uiter_setLenient8(&iter2, (const char *)bytes, -1);
compareIterators(&iter1, "UTF16Iterator", &iter2, "Lenient8Iterator_1");
puts("no output so far means that the lenient-8 iterator works fine");
puts("iterate forward:\nUTF-16\tlenient-8");
iter1.move(&iter1, 0, UITER_START);
iter2.move(&iter2, 0, UITER_START);
for(;;) {
c1=iter1.next(&iter1);
c2=iter2.next(&iter2);
if(c1<0 && c2<0) {
break;
}
if(c1<0) {
printf("\t%04x\n", c2);
} else if(c2<0) {
printf("%04x\n", c1);
} else {
printf("%04x\t%04x\n", c1, c2);
}
}
}
extern int
main(int argc, const char *argv[]) {
TestLenient8Iterator();
return 0;
}

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icu4c/source/samples/uciter8/uciter8.dsw Normal file
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