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ustrtrns.cpp
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ustrtrns.cpp
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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
*
* Copyright (C) 2001-2016, International Business Machines
* Corporation and others. All Rights Reserved.
*
******************************************************************************
*
* File ustrtrns.cpp
*
* Modification History:
*
* Date Name Description
* 9/10/2001 Ram Creation.
******************************************************************************
*/
/*******************************************************************************
*
* u_strTo* and u_strFrom* APIs
* WCS functions moved to ustr_wcs.c for better modularization
*
*******************************************************************************
*/
#include "unicode/putil.h"
#include "unicode/ustring.h"
#include "unicode/utf.h"
#include "unicode/utf8.h"
#include "unicode/utf16.h"
#include "cstring.h"
#include "cmemory.h"
#include "ustr_imp.h"
#include "uassert.h"
U_CAPI char16_t* U_EXPORT2
u_strFromUTF32WithSub(char16_t *dest,
int32_t destCapacity,
int32_t *pDestLength,
const UChar32 *src,
int32_t srcLength,
UChar32 subchar, int32_t *pNumSubstitutions,
UErrorCode *pErrorCode) {
const UChar32 *srcLimit;
UChar32 ch;
char16_t *destLimit;
char16_t *pDest;
int32_t reqLength;
int32_t numSubstitutions;
/* args check */
if(U_FAILURE(*pErrorCode)){
return nullptr;
}
if( (src==nullptr && srcLength!=0) || srcLength < -1 ||
(destCapacity<0) || (dest == nullptr && destCapacity > 0) ||
subchar > 0x10ffff || U_IS_SURROGATE(subchar)
) {
*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
return nullptr;
}
if(pNumSubstitutions != nullptr) {
*pNumSubstitutions = 0;
}
pDest = dest;
destLimit = (dest!=nullptr)?(dest + destCapacity):nullptr;
reqLength = 0;
numSubstitutions = 0;
if(srcLength < 0) {
/* simple loop for conversion of a NUL-terminated BMP string */
while((ch=*src) != 0 &&
((uint32_t)ch < 0xd800 || (0xe000 <= ch && ch <= 0xffff))) {
++src;
if(pDest < destLimit) {
*pDest++ = (char16_t)ch;
} else {
++reqLength;
}
}
srcLimit = src;
if(ch != 0) {
/* "complicated" case, find the end of the remaining string */
while(*++srcLimit != 0) {}
}
} else {
srcLimit = (src!=nullptr)?(src + srcLength):nullptr;
}
/* convert with length */
while(src < srcLimit) {
ch = *src++;
do {
/* usually "loops" once; twice only for writing subchar */
if((uint32_t)ch < 0xd800 || (0xe000 <= ch && ch <= 0xffff)) {
if(pDest < destLimit) {
*pDest++ = (char16_t)ch;
} else {
++reqLength;
}
break;
} else if(0x10000 <= ch && ch <= 0x10ffff) {
if(pDest!=nullptr && ((pDest + 2) <= destLimit)) {
*pDest++ = U16_LEAD(ch);
*pDest++ = U16_TRAIL(ch);
} else {
reqLength += 2;
}
break;
} else if((ch = subchar) < 0) {
/* surrogate code point, or not a Unicode code point at all */
*pErrorCode = U_INVALID_CHAR_FOUND;
return nullptr;
} else {
++numSubstitutions;
}
} while(true);
}
reqLength += (int32_t)(pDest - dest);
if(pDestLength) {
*pDestLength = reqLength;
}
if(pNumSubstitutions != nullptr) {
*pNumSubstitutions = numSubstitutions;
}
/* Terminate the buffer */
u_terminateUChars(dest, destCapacity, reqLength, pErrorCode);
return dest;
}
U_CAPI char16_t* U_EXPORT2
u_strFromUTF32(char16_t *dest,
int32_t destCapacity,
int32_t *pDestLength,
const UChar32 *src,
int32_t srcLength,
UErrorCode *pErrorCode) {
return u_strFromUTF32WithSub(
dest, destCapacity, pDestLength,
src, srcLength,
U_SENTINEL, nullptr,
pErrorCode);
}
U_CAPI UChar32* U_EXPORT2
u_strToUTF32WithSub(UChar32 *dest,
int32_t destCapacity,
int32_t *pDestLength,
const char16_t *src,
int32_t srcLength,
UChar32 subchar, int32_t *pNumSubstitutions,
UErrorCode *pErrorCode) {
const char16_t *srcLimit;
UChar32 ch;
char16_t ch2;
UChar32 *destLimit;
UChar32 *pDest;
int32_t reqLength;
int32_t numSubstitutions;
/* args check */
if(U_FAILURE(*pErrorCode)){
return nullptr;
}
if( (src==nullptr && srcLength!=0) || srcLength < -1 ||
(destCapacity<0) || (dest == nullptr && destCapacity > 0) ||
subchar > 0x10ffff || U_IS_SURROGATE(subchar)
) {
*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
return nullptr;
}
if(pNumSubstitutions != nullptr) {
*pNumSubstitutions = 0;
}
pDest = dest;
destLimit = (dest!=nullptr)?(dest + destCapacity):nullptr;
reqLength = 0;
numSubstitutions = 0;
if(srcLength < 0) {
/* simple loop for conversion of a NUL-terminated BMP string */
while((ch=*src) != 0 && !U16_IS_SURROGATE(ch)) {
++src;
if(pDest < destLimit) {
*pDest++ = ch;
} else {
++reqLength;
}
}
srcLimit = src;
if(ch != 0) {
/* "complicated" case, find the end of the remaining string */
while(*++srcLimit != 0) {}
}
} else {
srcLimit = (src!=nullptr)?(src + srcLength):nullptr;
}
/* convert with length */
while(src < srcLimit) {
ch = *src++;
if(!U16_IS_SURROGATE(ch)) {
/* write or count ch below */
} else if(U16_IS_SURROGATE_LEAD(ch) && src < srcLimit && U16_IS_TRAIL(ch2 = *src)) {
++src;
ch = U16_GET_SUPPLEMENTARY(ch, ch2);
} else if((ch = subchar) < 0) {
/* unpaired surrogate */
*pErrorCode = U_INVALID_CHAR_FOUND;
return nullptr;
} else {
++numSubstitutions;
}
if(pDest < destLimit) {
*pDest++ = ch;
} else {
++reqLength;
}
}
reqLength += (int32_t)(pDest - dest);
if(pDestLength) {
*pDestLength = reqLength;
}
if(pNumSubstitutions != nullptr) {
*pNumSubstitutions = numSubstitutions;
}
/* Terminate the buffer */
u_terminateUChar32s(dest, destCapacity, reqLength, pErrorCode);
return dest;
}
U_CAPI UChar32* U_EXPORT2
u_strToUTF32(UChar32 *dest,
int32_t destCapacity,
int32_t *pDestLength,
const char16_t *src,
int32_t srcLength,
UErrorCode *pErrorCode) {
return u_strToUTF32WithSub(
dest, destCapacity, pDestLength,
src, srcLength,
U_SENTINEL, nullptr,
pErrorCode);
}
U_CAPI char16_t* U_EXPORT2
u_strFromUTF8WithSub(char16_t *dest,
int32_t destCapacity,
int32_t *pDestLength,
const char* src,
int32_t srcLength,
UChar32 subchar, int32_t *pNumSubstitutions,
UErrorCode *pErrorCode){
/* args check */
if(U_FAILURE(*pErrorCode)) {
return nullptr;
}
if( (src==nullptr && srcLength!=0) || srcLength < -1 ||
(destCapacity<0) || (dest == nullptr && destCapacity > 0) ||
subchar > 0x10ffff || U_IS_SURROGATE(subchar)
) {
*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
return nullptr;
}
if(pNumSubstitutions!=nullptr) {
*pNumSubstitutions=0;
}
char16_t *pDest = dest;
char16_t *pDestLimit = dest+destCapacity;
int32_t reqLength = 0;
int32_t numSubstitutions=0;
/*
* Inline processing of UTF-8 byte sequences:
*
* Byte sequences for the most common characters are handled inline in
* the conversion loops. In order to reduce the path lengths for those
* characters, the tests are arranged in a kind of binary search.
* ASCII (<=0x7f) is checked first, followed by the dividing point
* between 2- and 3-byte sequences (0xe0).
* The 3-byte branch is tested first to speed up CJK text.
* The compiler should combine the subtractions for the two tests for 0xe0.
* Each branch then tests for the other end of its range.
*/
if(srcLength < 0){
/*
* Transform a NUL-terminated string.
* The code explicitly checks for NULs only in the lead byte position.
* A NUL byte in the trail byte position fails the trail byte range check anyway.
*/
int32_t i;
UChar32 c;
for(i = 0; (c = (uint8_t)src[i]) != 0 && (pDest < pDestLimit);) {
// modified copy of U8_NEXT()
++i;
if(U8_IS_SINGLE(c)) {
*pDest++=(char16_t)c;
} else {
uint8_t __t1, __t2;
if( /* handle U+0800..U+FFFF inline */
(0xe0<=(c) && (c)<0xf0) &&
U8_IS_VALID_LEAD3_AND_T1((c), src[i]) &&
(__t2=src[(i)+1]-0x80)<=0x3f) {
*pDest++ = (((c)&0xf)<<12)|((src[i]&0x3f)<<6)|__t2;
i+=2;
} else if( /* handle U+0080..U+07FF inline */
((c)<0xe0 && (c)>=0xc2) &&
(__t1=src[i]-0x80)<=0x3f) {
*pDest++ = (((c)&0x1f)<<6)|__t1;
++(i);
} else {
/* function call for "complicated" and error cases */
(c)=utf8_nextCharSafeBody((const uint8_t *)src, &(i), -1, c, -1);
if(c<0 && (++numSubstitutions, c = subchar) < 0) {
*pErrorCode = U_INVALID_CHAR_FOUND;
return nullptr;
} else if(c<=0xFFFF) {
*(pDest++)=(char16_t)c;
} else {
*(pDest++)=U16_LEAD(c);
if(pDest<pDestLimit) {
*(pDest++)=U16_TRAIL(c);
} else {
reqLength++;
break;
}
}
}
}
}
/* Pre-flight the rest of the string. */
while((c = (uint8_t)src[i]) != 0) {
// modified copy of U8_NEXT()
++i;
if(U8_IS_SINGLE(c)) {
++reqLength;
} else {
uint8_t __t1, __t2;
if( /* handle U+0800..U+FFFF inline */
(0xe0<=(c) && (c)<0xf0) &&
U8_IS_VALID_LEAD3_AND_T1((c), src[i]) &&
(__t2=src[(i)+1]-0x80)<=0x3f) {
++reqLength;
i+=2;
} else if( /* handle U+0080..U+07FF inline */
((c)<0xe0 && (c)>=0xc2) &&
(__t1=src[i]-0x80)<=0x3f) {
++reqLength;
++(i);
} else {
/* function call for "complicated" and error cases */
(c)=utf8_nextCharSafeBody((const uint8_t *)src, &(i), -1, c, -1);
if(c<0 && (++numSubstitutions, c = subchar) < 0) {
*pErrorCode = U_INVALID_CHAR_FOUND;
return nullptr;
}
reqLength += U16_LENGTH(c);
}
}
}
} else /* srcLength >= 0 */ {
/* Faster loop without ongoing checking for srcLength and pDestLimit. */
int32_t i = 0;
UChar32 c;
for(;;) {
/*
* Each iteration of the inner loop progresses by at most 3 UTF-8
* bytes and one char16_t, for most characters.
* For supplementary code points (4 & 2), which are rare,
* there is an additional adjustment.
*/
int32_t count = (int32_t)(pDestLimit - pDest);
int32_t count2 = (srcLength - i) / 3;
if(count > count2) {
count = count2; /* min(remaining dest, remaining src/3) */
}
if(count < 3) {
/*
* Too much overhead if we get near the end of the string,
* continue with the next loop.
*/
break;
}
do {
// modified copy of U8_NEXT()
c = (uint8_t)src[i++];
if(U8_IS_SINGLE(c)) {
*pDest++=(char16_t)c;
} else {
uint8_t __t1, __t2;
if( /* handle U+0800..U+FFFF inline */
(0xe0<=(c) && (c)<0xf0) &&
((i)+1)<srcLength &&
U8_IS_VALID_LEAD3_AND_T1((c), src[i]) &&
(__t2=src[(i)+1]-0x80)<=0x3f) {
*pDest++ = (((c)&0xf)<<12)|((src[i]&0x3f)<<6)|__t2;
i+=2;
} else if( /* handle U+0080..U+07FF inline */
((c)<0xe0 && (c)>=0xc2) &&
((i)!=srcLength) &&
(__t1=src[i]-0x80)<=0x3f) {
*pDest++ = (((c)&0x1f)<<6)|__t1;
++(i);
} else {
if(c >= 0xf0 || subchar > 0xffff) {
// We may read up to four bytes and write up to two UChars,
// which we didn't account for with computing count,
// so we adjust it here.
if(--count == 0) {
--i; // back out byte c
break;
}
}
/* function call for "complicated" and error cases */
(c)=utf8_nextCharSafeBody((const uint8_t *)src, &(i), srcLength, c, -1);
if(c<0 && (++numSubstitutions, c = subchar) < 0) {
*pErrorCode = U_INVALID_CHAR_FOUND;
return nullptr;
} else if(c<=0xFFFF) {
*(pDest++)=(char16_t)c;
} else {
*(pDest++)=U16_LEAD(c);
*(pDest++)=U16_TRAIL(c);
}
}
}
} while(--count > 0);
}
while(i < srcLength && (pDest < pDestLimit)) {
// modified copy of U8_NEXT()
c = (uint8_t)src[i++];
if(U8_IS_SINGLE(c)) {
*pDest++=(char16_t)c;
} else {
uint8_t __t1, __t2;
if( /* handle U+0800..U+FFFF inline */
(0xe0<=(c) && (c)<0xf0) &&
((i)+1)<srcLength &&
U8_IS_VALID_LEAD3_AND_T1((c), src[i]) &&
(__t2=src[(i)+1]-0x80)<=0x3f) {
*pDest++ = (((c)&0xf)<<12)|((src[i]&0x3f)<<6)|__t2;
i+=2;
} else if( /* handle U+0080..U+07FF inline */
((c)<0xe0 && (c)>=0xc2) &&
((i)!=srcLength) &&
(__t1=src[i]-0x80)<=0x3f) {
*pDest++ = (((c)&0x1f)<<6)|__t1;
++(i);
} else {
/* function call for "complicated" and error cases */
(c)=utf8_nextCharSafeBody((const uint8_t *)src, &(i), srcLength, c, -1);
if(c<0 && (++numSubstitutions, c = subchar) < 0) {
*pErrorCode = U_INVALID_CHAR_FOUND;
return nullptr;
} else if(c<=0xFFFF) {
*(pDest++)=(char16_t)c;
} else {
*(pDest++)=U16_LEAD(c);
if(pDest<pDestLimit) {
*(pDest++)=U16_TRAIL(c);
} else {
reqLength++;
break;
}
}
}
}
}
/* Pre-flight the rest of the string. */
while(i < srcLength) {
// modified copy of U8_NEXT()
c = (uint8_t)src[i++];
if(U8_IS_SINGLE(c)) {
++reqLength;
} else {
uint8_t __t1, __t2;
if( /* handle U+0800..U+FFFF inline */
(0xe0<=(c) && (c)<0xf0) &&
((i)+1)<srcLength &&
U8_IS_VALID_LEAD3_AND_T1((c), src[i]) &&
(__t2=src[(i)+1]-0x80)<=0x3f) {
++reqLength;
i+=2;
} else if( /* handle U+0080..U+07FF inline */
((c)<0xe0 && (c)>=0xc2) &&
((i)!=srcLength) &&
(__t1=src[i]-0x80)<=0x3f) {
++reqLength;
++(i);
} else {
/* function call for "complicated" and error cases */
(c)=utf8_nextCharSafeBody((const uint8_t *)src, &(i), srcLength, c, -1);
if(c<0 && (++numSubstitutions, c = subchar) < 0) {
*pErrorCode = U_INVALID_CHAR_FOUND;
return nullptr;
}
reqLength += U16_LENGTH(c);
}
}
}
}
reqLength+=(int32_t)(pDest - dest);
if(pNumSubstitutions!=nullptr) {
*pNumSubstitutions=numSubstitutions;
}
if(pDestLength){
*pDestLength = reqLength;
}
/* Terminate the buffer */
u_terminateUChars(dest,destCapacity,reqLength,pErrorCode);
return dest;
}
U_CAPI char16_t* U_EXPORT2
u_strFromUTF8(char16_t *dest,
int32_t destCapacity,
int32_t *pDestLength,
const char* src,
int32_t srcLength,
UErrorCode *pErrorCode){
return u_strFromUTF8WithSub(
dest, destCapacity, pDestLength,
src, srcLength,
U_SENTINEL, nullptr,
pErrorCode);
}
U_CAPI char16_t * U_EXPORT2
u_strFromUTF8Lenient(char16_t *dest,
int32_t destCapacity,
int32_t *pDestLength,
const char *src,
int32_t srcLength,
UErrorCode *pErrorCode) {
char16_t *pDest = dest;
UChar32 ch;
int32_t reqLength = 0;
uint8_t* pSrc = (uint8_t*) src;
/* args check */
if(U_FAILURE(*pErrorCode)){
return nullptr;
}
if( (src==nullptr && srcLength!=0) || srcLength < -1 ||
(destCapacity<0) || (dest == nullptr && destCapacity > 0)
) {
*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
return nullptr;
}
if(srcLength < 0) {
/* Transform a NUL-terminated string. */
char16_t *pDestLimit = (dest!=nullptr)?(dest+destCapacity):nullptr;
uint8_t t1, t2, t3; /* trail bytes */
while(((ch = *pSrc) != 0) && (pDest < pDestLimit)) {
if(ch < 0xc0) {
/*
* ASCII, or a trail byte in lead position which is treated like
* a single-byte sequence for better character boundary
* resynchronization after illegal sequences.
*/
*pDest++=(char16_t)ch;
++pSrc;
continue;
} else if(ch < 0xe0) { /* U+0080..U+07FF */
if((t1 = pSrc[1]) != 0) {
/* 0x3080 = (0xc0 << 6) + 0x80 */
*pDest++ = (char16_t)((ch << 6) + t1 - 0x3080);
pSrc += 2;
continue;
}
} else if(ch < 0xf0) { /* U+0800..U+FFFF */
if((t1 = pSrc[1]) != 0 && (t2 = pSrc[2]) != 0) {
/* no need for (ch & 0xf) because the upper bits are truncated after <<12 in the cast to (char16_t) */
/* 0x2080 = (0x80 << 6) + 0x80 */
*pDest++ = (char16_t)((ch << 12) + (t1 << 6) + t2 - 0x2080);
pSrc += 3;
continue;
}
} else /* f0..f4 */ { /* U+10000..U+10FFFF */
if((t1 = pSrc[1]) != 0 && (t2 = pSrc[2]) != 0 && (t3 = pSrc[3]) != 0) {
pSrc += 4;
/* 0x3c82080 = (0xf0 << 18) + (0x80 << 12) + (0x80 << 6) + 0x80 */
ch = (ch << 18) + (t1 << 12) + (t2 << 6) + t3 - 0x3c82080;
*(pDest++) = U16_LEAD(ch);
if(pDest < pDestLimit) {
*(pDest++) = U16_TRAIL(ch);
} else {
reqLength = 1;
break;
}
continue;
}
}
/* truncated character at the end */
*pDest++ = 0xfffd;
while(*++pSrc != 0) {}
break;
}
/* Pre-flight the rest of the string. */
while((ch = *pSrc) != 0) {
if(ch < 0xc0) {
/*
* ASCII, or a trail byte in lead position which is treated like
* a single-byte sequence for better character boundary
* resynchronization after illegal sequences.
*/
++reqLength;
++pSrc;
continue;
} else if(ch < 0xe0) { /* U+0080..U+07FF */
if(pSrc[1] != 0) {
++reqLength;
pSrc += 2;
continue;
}
} else if(ch < 0xf0) { /* U+0800..U+FFFF */
if(pSrc[1] != 0 && pSrc[2] != 0) {
++reqLength;
pSrc += 3;
continue;
}
} else /* f0..f4 */ { /* U+10000..U+10FFFF */
if(pSrc[1] != 0 && pSrc[2] != 0 && pSrc[3] != 0) {
reqLength += 2;
pSrc += 4;
continue;
}
}
/* truncated character at the end */
++reqLength;
break;
}
} else /* srcLength >= 0 */ {
const uint8_t *pSrcLimit = (pSrc!=nullptr)?(pSrc + srcLength):nullptr;
/*
* This function requires that if srcLength is given, then it must be
* destCapatity >= srcLength so that we need not check for
* destination buffer overflow in the loop.
*/
if(destCapacity < srcLength) {
if(pDestLength != nullptr) {
*pDestLength = srcLength; /* this likely overestimates the true destLength! */
}
*pErrorCode = U_BUFFER_OVERFLOW_ERROR;
return nullptr;
}
if((pSrcLimit - pSrc) >= 4) {
pSrcLimit -= 3; /* temporarily reduce pSrcLimit */
/* in this loop, we can always access at least 4 bytes, up to pSrc+3 */
do {
ch = *pSrc++;
if(ch < 0xc0) {
/*
* ASCII, or a trail byte in lead position which is treated like
* a single-byte sequence for better character boundary
* resynchronization after illegal sequences.
*/
*pDest++=(char16_t)ch;
} else if(ch < 0xe0) { /* U+0080..U+07FF */
/* 0x3080 = (0xc0 << 6) + 0x80 */
*pDest++ = (char16_t)((ch << 6) + *pSrc++ - 0x3080);
} else if(ch < 0xf0) { /* U+0800..U+FFFF */
/* no need for (ch & 0xf) because the upper bits are truncated after <<12 in the cast to (char16_t) */
/* 0x2080 = (0x80 << 6) + 0x80 */
ch = (ch << 12) + (*pSrc++ << 6);
*pDest++ = (char16_t)(ch + *pSrc++ - 0x2080);
} else /* f0..f4 */ { /* U+10000..U+10FFFF */
/* 0x3c82080 = (0xf0 << 18) + (0x80 << 12) + (0x80 << 6) + 0x80 */
ch = (ch << 18) + (*pSrc++ << 12);
ch += *pSrc++ << 6;
ch += *pSrc++ - 0x3c82080;
*(pDest++) = U16_LEAD(ch);
*(pDest++) = U16_TRAIL(ch);
}
} while(pSrc < pSrcLimit);
pSrcLimit += 3; /* restore original pSrcLimit */
}
while(pSrc < pSrcLimit) {
ch = *pSrc++;
if(ch < 0xc0) {
/*
* ASCII, or a trail byte in lead position which is treated like
* a single-byte sequence for better character boundary
* resynchronization after illegal sequences.
*/
*pDest++=(char16_t)ch;
continue;
} else if(ch < 0xe0) { /* U+0080..U+07FF */
if(pSrc < pSrcLimit) {
/* 0x3080 = (0xc0 << 6) + 0x80 */
*pDest++ = (char16_t)((ch << 6) + *pSrc++ - 0x3080);
continue;
}
} else if(ch < 0xf0) { /* U+0800..U+FFFF */
if((pSrcLimit - pSrc) >= 2) {
/* no need for (ch & 0xf) because the upper bits are truncated after <<12 in the cast to (char16_t) */
/* 0x2080 = (0x80 << 6) + 0x80 */
ch = (ch << 12) + (*pSrc++ << 6);
*pDest++ = (char16_t)(ch + *pSrc++ - 0x2080);
pSrc += 3;
continue;
}
} else /* f0..f4 */ { /* U+10000..U+10FFFF */
if((pSrcLimit - pSrc) >= 3) {
/* 0x3c82080 = (0xf0 << 18) + (0x80 << 12) + (0x80 << 6) + 0x80 */
ch = (ch << 18) + (*pSrc++ << 12);
ch += *pSrc++ << 6;
ch += *pSrc++ - 0x3c82080;
*(pDest++) = U16_LEAD(ch);
*(pDest++) = U16_TRAIL(ch);
pSrc += 4;
continue;
}
}
/* truncated character at the end */
*pDest++ = 0xfffd;
break;
}
}
reqLength+=(int32_t)(pDest - dest);
if(pDestLength){
*pDestLength = reqLength;
}
/* Terminate the buffer */
u_terminateUChars(dest,destCapacity,reqLength,pErrorCode);
return dest;
}
static inline uint8_t *
_appendUTF8(uint8_t *pDest, UChar32 c) {
/* it is 0<=c<=0x10ffff and not a surrogate if called by a validating function */
if((c)<=0x7f) {
*pDest++ = static_cast<uint8_t>(c);
} else if(c<=0x7ff) {
*pDest++ = static_cast<uint8_t>((c >> 6) | 0xc0);
*pDest++ = static_cast<uint8_t>((c & 0x3f) | 0x80);
} else if(c<=0xffff) {
*pDest++ = static_cast<uint8_t>((c >> 12) | 0xe0);
*pDest++ = static_cast<uint8_t>(((c >> 6) & 0x3f) | 0x80);
*pDest++ = static_cast<uint8_t>(((c) & 0x3f) | 0x80);
} else /* if((uint32_t)(c)<=0x10ffff) */ {
*pDest++ = static_cast<uint8_t>(((c) >> 18) | 0xf0);
*pDest++ = static_cast<uint8_t>((((c) >> 12) & 0x3f) | 0x80);
*pDest++ = static_cast<uint8_t>((((c) >> 6) & 0x3f) | 0x80);
*pDest++ = static_cast<uint8_t>(((c) & 0x3f) | 0x80);
}
return pDest;
}
U_CAPI char* U_EXPORT2
u_strToUTF8WithSub(char *dest,
int32_t destCapacity,
int32_t *pDestLength,
const char16_t *pSrc,
int32_t srcLength,
UChar32 subchar, int32_t *pNumSubstitutions,
UErrorCode *pErrorCode){
int32_t reqLength=0;
uint32_t ch=0,ch2=0;
uint8_t *pDest = (uint8_t *)dest;
uint8_t *pDestLimit = (pDest!=nullptr)?(pDest + destCapacity):nullptr;
int32_t numSubstitutions;
/* args check */
if(U_FAILURE(*pErrorCode)){
return nullptr;
}
if( (pSrc==nullptr && srcLength!=0) || srcLength < -1 ||
(destCapacity<0) || (dest == nullptr && destCapacity > 0) ||
subchar > 0x10ffff || U_IS_SURROGATE(subchar)
) {
*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
return nullptr;
}
if(pNumSubstitutions!=nullptr) {
*pNumSubstitutions=0;
}
numSubstitutions=0;
if(srcLength==-1) {
while((ch=*pSrc)!=0) {
++pSrc;
if(ch <= 0x7f) {
if(pDest<pDestLimit) {
*pDest++ = (uint8_t)ch;
} else {
reqLength = 1;
break;
}
} else if(ch <= 0x7ff) {
if((pDestLimit - pDest) >= 2) {
*pDest++=(uint8_t)((ch>>6)|0xc0);
*pDest++=(uint8_t)((ch&0x3f)|0x80);
} else {
reqLength = 2;
break;
}
} else if(ch <= 0xd7ff || ch >= 0xe000) {
if((pDestLimit - pDest) >= 3) {
*pDest++=(uint8_t)((ch>>12)|0xe0);
*pDest++=(uint8_t)(((ch>>6)&0x3f)|0x80);
*pDest++=(uint8_t)((ch&0x3f)|0x80);
} else {
reqLength = 3;
break;
}
} else /* ch is a surrogate */ {
int32_t length;
/*need not check for NUL because NUL fails U16_IS_TRAIL() anyway*/
if(U16_IS_SURROGATE_LEAD(ch) && U16_IS_TRAIL(ch2=*pSrc)) {
++pSrc;
ch=U16_GET_SUPPLEMENTARY(ch, ch2);
} else if(subchar>=0) {
ch=subchar;
++numSubstitutions;
} else {
/* Unicode 3.2 forbids surrogate code points in UTF-8 */
*pErrorCode = U_INVALID_CHAR_FOUND;
return nullptr;
}
length = U8_LENGTH(ch);
if((pDestLimit - pDest) >= length) {
/* convert and append*/
pDest=_appendUTF8(pDest, ch);
} else {
reqLength = length;
break;
}
}
}
while((ch=*pSrc++)!=0) {
if(ch<=0x7f) {
++reqLength;
} else if(ch<=0x7ff) {
reqLength+=2;
} else if(!U16_IS_SURROGATE(ch)) {
reqLength+=3;
} else if(U16_IS_SURROGATE_LEAD(ch) && U16_IS_TRAIL(ch2=*pSrc)) {
++pSrc;
reqLength+=4;
} else if(subchar>=0) {
reqLength+=U8_LENGTH(subchar);
++numSubstitutions;
} else {
/* Unicode 3.2 forbids surrogate code points in UTF-8 */
*pErrorCode = U_INVALID_CHAR_FOUND;
return nullptr;
}
}
} else {
const char16_t *pSrcLimit = (pSrc!=nullptr)?(pSrc+srcLength):nullptr;
int32_t count;
/* Faster loop without ongoing checking for pSrcLimit and pDestLimit. */
for(;;) {
/*
* Each iteration of the inner loop progresses by at most 3 UTF-8
* bytes and one char16_t, for most characters.
* For supplementary code points (4 & 2), which are rare,
* there is an additional adjustment.
*/
count = (int32_t)((pDestLimit - pDest) / 3);
srcLength = (int32_t)(pSrcLimit - pSrc);
if(count > srcLength) {
count = srcLength; /* min(remaining dest/3, remaining src) */
}
if(count < 3) {
/*
* Too much overhead if we get near the end of the string,
* continue with the next loop.
*/
break;
}
do {
ch=*pSrc++;
if(ch <= 0x7f) {
*pDest++ = (uint8_t)ch;
} else if(ch <= 0x7ff) {
*pDest++=(uint8_t)((ch>>6)|0xc0);
*pDest++=(uint8_t)((ch&0x3f)|0x80);
} else if(ch <= 0xd7ff || ch >= 0xe000) {
*pDest++=(uint8_t)((ch>>12)|0xe0);
*pDest++=(uint8_t)(((ch>>6)&0x3f)|0x80);
*pDest++=(uint8_t)((ch&0x3f)|0x80);
} else /* ch is a surrogate */ {
/*
* We will read two UChars and probably output four bytes,
* which we didn't account for with computing count,
* so we adjust it here.
*/
if(--count == 0) {
--pSrc; /* undo ch=*pSrc++ for the lead surrogate */
break; /* recompute count */
}
if(U16_IS_SURROGATE_LEAD(ch) && U16_IS_TRAIL(ch2=*pSrc)) {
++pSrc;
ch=U16_GET_SUPPLEMENTARY(ch, ch2);
/* writing 4 bytes per 2 UChars is ok */
*pDest++=(uint8_t)((ch>>18)|0xf0);
*pDest++=(uint8_t)(((ch>>12)&0x3f)|0x80);
*pDest++=(uint8_t)(((ch>>6)&0x3f)|0x80);
*pDest++=(uint8_t)((ch&0x3f)|0x80);
} else {
/* Unicode 3.2 forbids surrogate code points in UTF-8 */
if(subchar>=0) {
ch=subchar;
++numSubstitutions;
} else {
*pErrorCode = U_INVALID_CHAR_FOUND;
return nullptr;
}
/* convert and append*/
pDest=_appendUTF8(pDest, ch);
}
}
} while(--count > 0);
}
while(pSrc<pSrcLimit) {
ch=*pSrc++;
if(ch <= 0x7f) {
if(pDest<pDestLimit) {
*pDest++ = (uint8_t)ch;
} else {
reqLength = 1;
break;
}
} else if(ch <= 0x7ff) {
if((pDestLimit - pDest) >= 2) {
*pDest++=(uint8_t)((ch>>6)|0xc0);
*pDest++=(uint8_t)((ch&0x3f)|0x80);
} else {
reqLength = 2;
break;
}
} else if(ch <= 0xd7ff || ch >= 0xe000) {
if((pDestLimit - pDest) >= 3) {
*pDest++=(uint8_t)((ch>>12)|0xe0);
*pDest++=(uint8_t)(((ch>>6)&0x3f)|0x80);
*pDest++=(uint8_t)((ch&0x3f)|0x80);
} else {
reqLength = 3;
break;
}
} else /* ch is a surrogate */ {
int32_t length;
if(U16_IS_SURROGATE_LEAD(ch) && pSrc<pSrcLimit && U16_IS_TRAIL(ch2=*pSrc)) {
++pSrc;
ch=U16_GET_SUPPLEMENTARY(ch, ch2);
} else if(subchar>=0) {