1451 lines
49 KiB
C++
1451 lines
49 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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******************************************************************************
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*
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* Copyright (C) 2001-2016, 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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*
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* File ustrtrns.cpp
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*
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* Modification History:
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*
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* Date Name Description
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* 9/10/2001 Ram Creation.
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******************************************************************************
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*/
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/*******************************************************************************
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*
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* u_strTo* and u_strFrom* APIs
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* WCS functions moved to ustr_wcs.c for better modularization
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*
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*******************************************************************************
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*/
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#include "unicode/putil.h"
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#include "unicode/ustring.h"
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#include "unicode/utf.h"
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#include "unicode/utf8.h"
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#include "unicode/utf16.h"
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#include "cstring.h"
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#include "cmemory.h"
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#include "ustr_imp.h"
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#include "uassert.h"
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U_CAPI UChar* U_EXPORT2
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u_strFromUTF32WithSub(UChar *dest,
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int32_t destCapacity,
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int32_t *pDestLength,
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const UChar32 *src,
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int32_t srcLength,
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UChar32 subchar, int32_t *pNumSubstitutions,
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UErrorCode *pErrorCode) {
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const UChar32 *srcLimit;
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UChar32 ch;
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UChar *destLimit;
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UChar *pDest;
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int32_t reqLength;
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int32_t numSubstitutions;
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/* args check */
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if(U_FAILURE(*pErrorCode)){
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return NULL;
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}
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if( (src==NULL && srcLength!=0) || srcLength < -1 ||
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(destCapacity<0) || (dest == NULL && destCapacity > 0) ||
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subchar > 0x10ffff || U_IS_SURROGATE(subchar)
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) {
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*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
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return NULL;
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}
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if(pNumSubstitutions != NULL) {
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*pNumSubstitutions = 0;
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}
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pDest = dest;
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destLimit = (dest!=NULL)?(dest + destCapacity):NULL;
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reqLength = 0;
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numSubstitutions = 0;
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if(srcLength < 0) {
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/* simple loop for conversion of a NUL-terminated BMP string */
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while((ch=*src) != 0 &&
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((uint32_t)ch < 0xd800 || (0xe000 <= ch && ch <= 0xffff))) {
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++src;
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if(pDest < destLimit) {
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*pDest++ = (UChar)ch;
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} else {
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++reqLength;
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}
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}
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srcLimit = src;
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if(ch != 0) {
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/* "complicated" case, find the end of the remaining string */
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while(*++srcLimit != 0) {}
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}
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} else {
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srcLimit = (src!=NULL)?(src + srcLength):NULL;
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}
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/* convert with length */
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while(src < srcLimit) {
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ch = *src++;
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do {
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/* usually "loops" once; twice only for writing subchar */
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if((uint32_t)ch < 0xd800 || (0xe000 <= ch && ch <= 0xffff)) {
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if(pDest < destLimit) {
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*pDest++ = (UChar)ch;
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} else {
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++reqLength;
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}
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break;
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} else if(0x10000 <= ch && ch <= 0x10ffff) {
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if(pDest!=NULL && ((pDest + 2) <= destLimit)) {
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*pDest++ = U16_LEAD(ch);
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*pDest++ = U16_TRAIL(ch);
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} else {
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reqLength += 2;
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}
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break;
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} else if((ch = subchar) < 0) {
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/* surrogate code point, or not a Unicode code point at all */
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*pErrorCode = U_INVALID_CHAR_FOUND;
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return NULL;
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} else {
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++numSubstitutions;
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}
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} while(TRUE);
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}
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reqLength += (int32_t)(pDest - dest);
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if(pDestLength) {
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*pDestLength = reqLength;
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}
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if(pNumSubstitutions != NULL) {
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*pNumSubstitutions = numSubstitutions;
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}
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/* Terminate the buffer */
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u_terminateUChars(dest, destCapacity, reqLength, pErrorCode);
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return dest;
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}
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U_CAPI UChar* U_EXPORT2
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u_strFromUTF32(UChar *dest,
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int32_t destCapacity,
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int32_t *pDestLength,
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const UChar32 *src,
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int32_t srcLength,
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UErrorCode *pErrorCode) {
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return u_strFromUTF32WithSub(
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dest, destCapacity, pDestLength,
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src, srcLength,
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U_SENTINEL, NULL,
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pErrorCode);
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}
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U_CAPI UChar32* U_EXPORT2
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u_strToUTF32WithSub(UChar32 *dest,
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int32_t destCapacity,
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int32_t *pDestLength,
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const UChar *src,
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int32_t srcLength,
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UChar32 subchar, int32_t *pNumSubstitutions,
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UErrorCode *pErrorCode) {
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const UChar *srcLimit;
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UChar32 ch;
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UChar ch2;
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UChar32 *destLimit;
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UChar32 *pDest;
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int32_t reqLength;
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int32_t numSubstitutions;
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/* args check */
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if(U_FAILURE(*pErrorCode)){
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return NULL;
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}
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if( (src==NULL && srcLength!=0) || srcLength < -1 ||
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(destCapacity<0) || (dest == NULL && destCapacity > 0) ||
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subchar > 0x10ffff || U_IS_SURROGATE(subchar)
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) {
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*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
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return NULL;
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}
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if(pNumSubstitutions != NULL) {
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*pNumSubstitutions = 0;
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}
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pDest = dest;
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destLimit = (dest!=NULL)?(dest + destCapacity):NULL;
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reqLength = 0;
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numSubstitutions = 0;
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if(srcLength < 0) {
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/* simple loop for conversion of a NUL-terminated BMP string */
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while((ch=*src) != 0 && !U16_IS_SURROGATE(ch)) {
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++src;
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if(pDest < destLimit) {
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*pDest++ = ch;
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} else {
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++reqLength;
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}
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}
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srcLimit = src;
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if(ch != 0) {
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/* "complicated" case, find the end of the remaining string */
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while(*++srcLimit != 0) {}
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}
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} else {
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srcLimit = (src!=NULL)?(src + srcLength):NULL;
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}
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/* convert with length */
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while(src < srcLimit) {
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ch = *src++;
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if(!U16_IS_SURROGATE(ch)) {
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/* write or count ch below */
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} else if(U16_IS_SURROGATE_LEAD(ch) && src < srcLimit && U16_IS_TRAIL(ch2 = *src)) {
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++src;
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ch = U16_GET_SUPPLEMENTARY(ch, ch2);
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} else if((ch = subchar) < 0) {
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/* unpaired surrogate */
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*pErrorCode = U_INVALID_CHAR_FOUND;
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return NULL;
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} else {
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++numSubstitutions;
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}
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if(pDest < destLimit) {
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*pDest++ = ch;
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} else {
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++reqLength;
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}
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}
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reqLength += (int32_t)(pDest - dest);
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if(pDestLength) {
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*pDestLength = reqLength;
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}
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if(pNumSubstitutions != NULL) {
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*pNumSubstitutions = numSubstitutions;
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}
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/* Terminate the buffer */
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u_terminateUChar32s(dest, destCapacity, reqLength, pErrorCode);
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return dest;
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}
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U_CAPI UChar32* U_EXPORT2
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u_strToUTF32(UChar32 *dest,
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int32_t destCapacity,
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int32_t *pDestLength,
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const UChar *src,
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int32_t srcLength,
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UErrorCode *pErrorCode) {
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return u_strToUTF32WithSub(
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dest, destCapacity, pDestLength,
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src, srcLength,
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U_SENTINEL, NULL,
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pErrorCode);
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}
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U_CAPI UChar* U_EXPORT2
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u_strFromUTF8WithSub(UChar *dest,
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int32_t destCapacity,
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int32_t *pDestLength,
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const char* src,
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int32_t srcLength,
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UChar32 subchar, int32_t *pNumSubstitutions,
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UErrorCode *pErrorCode){
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/* args check */
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if(U_FAILURE(*pErrorCode)) {
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return NULL;
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}
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if( (src==NULL && srcLength!=0) || srcLength < -1 ||
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(destCapacity<0) || (dest == NULL && destCapacity > 0) ||
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subchar > 0x10ffff || U_IS_SURROGATE(subchar)
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) {
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*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
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return NULL;
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}
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if(pNumSubstitutions!=NULL) {
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*pNumSubstitutions=0;
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}
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UChar *pDest = dest;
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UChar *pDestLimit = dest+destCapacity;
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int32_t reqLength = 0;
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int32_t numSubstitutions=0;
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/*
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* Inline processing of UTF-8 byte sequences:
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*
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* Byte sequences for the most common characters are handled inline in
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* the conversion loops. In order to reduce the path lengths for those
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* characters, the tests are arranged in a kind of binary search.
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* ASCII (<=0x7f) is checked first, followed by the dividing point
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* between 2- and 3-byte sequences (0xe0).
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* The 3-byte branch is tested first to speed up CJK text.
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* The compiler should combine the subtractions for the two tests for 0xe0.
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* Each branch then tests for the other end of its range.
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*/
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if(srcLength < 0){
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/*
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* Transform a NUL-terminated string.
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* The code explicitly checks for NULs only in the lead byte position.
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* A NUL byte in the trail byte position fails the trail byte range check anyway.
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*/
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int32_t i;
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UChar32 c;
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for(i = 0; (c = (uint8_t)src[i]) != 0 && (pDest < pDestLimit);) {
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// modified copy of U8_NEXT()
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++i;
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if(U8_IS_SINGLE(c)) {
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*pDest++=(UChar)c;
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} else {
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uint8_t __t1, __t2;
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if( /* handle U+0800..U+FFFF inline */
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(0xe0<=(c) && (c)<0xf0) &&
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U8_IS_VALID_LEAD3_AND_T1((c), src[i]) &&
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(__t2=src[(i)+1]-0x80)<=0x3f) {
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*pDest++ = (((c)&0xf)<<12)|((src[i]&0x3f)<<6)|__t2;
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i+=2;
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} else if( /* handle U+0080..U+07FF inline */
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((c)<0xe0 && (c)>=0xc2) &&
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(__t1=src[i]-0x80)<=0x3f) {
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*pDest++ = (((c)&0x1f)<<6)|__t1;
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++(i);
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} else {
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/* function call for "complicated" and error cases */
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(c)=utf8_nextCharSafeBody((const uint8_t *)src, &(i), -1, c, -1);
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if(c<0 && (++numSubstitutions, c = subchar) < 0) {
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*pErrorCode = U_INVALID_CHAR_FOUND;
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return NULL;
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} else if(c<=0xFFFF) {
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*(pDest++)=(UChar)c;
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} else {
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*(pDest++)=U16_LEAD(c);
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if(pDest<pDestLimit) {
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*(pDest++)=U16_TRAIL(c);
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} else {
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reqLength++;
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break;
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}
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}
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}
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}
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}
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/* Pre-flight the rest of the string. */
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while((c = (uint8_t)src[i]) != 0) {
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// modified copy of U8_NEXT()
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++i;
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if(U8_IS_SINGLE(c)) {
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++reqLength;
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} else {
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uint8_t __t1, __t2;
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if( /* handle U+0800..U+FFFF inline */
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(0xe0<=(c) && (c)<0xf0) &&
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U8_IS_VALID_LEAD3_AND_T1((c), src[i]) &&
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(__t2=src[(i)+1]-0x80)<=0x3f) {
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++reqLength;
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i+=2;
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} else if( /* handle U+0080..U+07FF inline */
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((c)<0xe0 && (c)>=0xc2) &&
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(__t1=src[i]-0x80)<=0x3f) {
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++reqLength;
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++(i);
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} else {
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/* function call for "complicated" and error cases */
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(c)=utf8_nextCharSafeBody((const uint8_t *)src, &(i), -1, c, -1);
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if(c<0 && (++numSubstitutions, c = subchar) < 0) {
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*pErrorCode = U_INVALID_CHAR_FOUND;
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return NULL;
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}
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reqLength += U16_LENGTH(c);
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}
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}
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}
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} else /* srcLength >= 0 */ {
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/* Faster loop without ongoing checking for srcLength and pDestLimit. */
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int32_t i = 0;
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UChar32 c;
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for(;;) {
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/*
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* Each iteration of the inner loop progresses by at most 3 UTF-8
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* bytes and one UChar, for most characters.
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* For supplementary code points (4 & 2), which are rare,
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* there is an additional adjustment.
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*/
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int32_t count = (int32_t)(pDestLimit - pDest);
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int32_t count2 = (srcLength - i) / 3;
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if(count > count2) {
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count = count2; /* min(remaining dest, remaining src/3) */
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}
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if(count < 3) {
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/*
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* Too much overhead if we get near the end of the string,
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* continue with the next loop.
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*/
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break;
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}
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do {
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// modified copy of U8_NEXT()
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c = (uint8_t)src[i++];
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if(U8_IS_SINGLE(c)) {
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*pDest++=(UChar)c;
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} else {
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uint8_t __t1, __t2;
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if( /* handle U+0800..U+FFFF inline */
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(0xe0<=(c) && (c)<0xf0) &&
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((i)+1)<srcLength &&
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U8_IS_VALID_LEAD3_AND_T1((c), src[i]) &&
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(__t2=src[(i)+1]-0x80)<=0x3f) {
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*pDest++ = (((c)&0xf)<<12)|((src[i]&0x3f)<<6)|__t2;
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i+=2;
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} else if( /* handle U+0080..U+07FF inline */
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((c)<0xe0 && (c)>=0xc2) &&
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((i)!=srcLength) &&
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(__t1=src[i]-0x80)<=0x3f) {
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*pDest++ = (((c)&0x1f)<<6)|__t1;
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++(i);
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} else {
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if(c >= 0xf0 || subchar > 0xffff) {
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// We may read up to four bytes and write up to two UChars,
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// which we didn't account for with computing count,
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// so we adjust it here.
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if(--count == 0) {
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--i; // back out byte c
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break;
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}
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}
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/* function call for "complicated" and error cases */
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(c)=utf8_nextCharSafeBody((const uint8_t *)src, &(i), srcLength, c, -1);
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if(c<0 && (++numSubstitutions, c = subchar) < 0) {
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*pErrorCode = U_INVALID_CHAR_FOUND;
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return NULL;
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} else if(c<=0xFFFF) {
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*(pDest++)=(UChar)c;
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} else {
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*(pDest++)=U16_LEAD(c);
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*(pDest++)=U16_TRAIL(c);
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}
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}
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}
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} while(--count > 0);
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}
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|
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while(i < srcLength && (pDest < pDestLimit)) {
|
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// modified copy of U8_NEXT()
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c = (uint8_t)src[i++];
|
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if(U8_IS_SINGLE(c)) {
|
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*pDest++=(UChar)c;
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} else {
|
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uint8_t __t1, __t2;
|
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if( /* handle U+0800..U+FFFF inline */
|
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(0xe0<=(c) && (c)<0xf0) &&
|
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((i)+1)<srcLength &&
|
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U8_IS_VALID_LEAD3_AND_T1((c), src[i]) &&
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(__t2=src[(i)+1]-0x80)<=0x3f) {
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*pDest++ = (((c)&0xf)<<12)|((src[i]&0x3f)<<6)|__t2;
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i+=2;
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} else if( /* handle U+0080..U+07FF inline */
|
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((c)<0xe0 && (c)>=0xc2) &&
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((i)!=srcLength) &&
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(__t1=src[i]-0x80)<=0x3f) {
|
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*pDest++ = (((c)&0x1f)<<6)|__t1;
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++(i);
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} else {
|
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/* function call for "complicated" and error cases */
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(c)=utf8_nextCharSafeBody((const uint8_t *)src, &(i), srcLength, c, -1);
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if(c<0 && (++numSubstitutions, c = subchar) < 0) {
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*pErrorCode = U_INVALID_CHAR_FOUND;
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return NULL;
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} else if(c<=0xFFFF) {
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*(pDest++)=(UChar)c;
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} else {
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*(pDest++)=U16_LEAD(c);
|
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if(pDest<pDestLimit) {
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*(pDest++)=U16_TRAIL(c);
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} else {
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reqLength++;
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break;
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}
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}
|
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}
|
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}
|
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}
|
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|
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/* Pre-flight the rest of the string. */
|
|
while(i < srcLength) {
|
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// modified copy of U8_NEXT()
|
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c = (uint8_t)src[i++];
|
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if(U8_IS_SINGLE(c)) {
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++reqLength;
|
|
} else {
|
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uint8_t __t1, __t2;
|
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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 NULL;
|
|
}
|
|
reqLength += U16_LENGTH(c);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
reqLength+=(int32_t)(pDest - dest);
|
|
|
|
if(pNumSubstitutions!=NULL) {
|
|
*pNumSubstitutions=numSubstitutions;
|
|
}
|
|
|
|
if(pDestLength){
|
|
*pDestLength = reqLength;
|
|
}
|
|
|
|
/* Terminate the buffer */
|
|
u_terminateUChars(dest,destCapacity,reqLength,pErrorCode);
|
|
|
|
return dest;
|
|
}
|
|
|
|
U_CAPI UChar* U_EXPORT2
|
|
u_strFromUTF8(UChar *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, NULL,
|
|
pErrorCode);
|
|
}
|
|
|
|
U_CAPI UChar * U_EXPORT2
|
|
u_strFromUTF8Lenient(UChar *dest,
|
|
int32_t destCapacity,
|
|
int32_t *pDestLength,
|
|
const char *src,
|
|
int32_t srcLength,
|
|
UErrorCode *pErrorCode) {
|
|
UChar *pDest = dest;
|
|
UChar32 ch;
|
|
int32_t reqLength = 0;
|
|
uint8_t* pSrc = (uint8_t*) src;
|
|
|
|
/* args check */
|
|
if(U_FAILURE(*pErrorCode)){
|
|
return NULL;
|
|
}
|
|
|
|
if( (src==NULL && srcLength!=0) || srcLength < -1 ||
|
|
(destCapacity<0) || (dest == NULL && destCapacity > 0)
|
|
) {
|
|
*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return NULL;
|
|
}
|
|
|
|
if(srcLength < 0) {
|
|
/* Transform a NUL-terminated string. */
|
|
UChar *pDestLimit = (dest!=NULL)?(dest+destCapacity):NULL;
|
|
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++=(UChar)ch;
|
|
++pSrc;
|
|
continue;
|
|
} else if(ch < 0xe0) { /* U+0080..U+07FF */
|
|
if((t1 = pSrc[1]) != 0) {
|
|
/* 0x3080 = (0xc0 << 6) + 0x80 */
|
|
*pDest++ = (UChar)((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 (UChar) */
|
|
/* 0x2080 = (0x80 << 6) + 0x80 */
|
|
*pDest++ = (UChar)((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!=NULL)?(pSrc + srcLength):NULL;
|
|
|
|
/*
|
|
* 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 != NULL) {
|
|
*pDestLength = srcLength; /* this likely overestimates the true destLength! */
|
|
}
|
|
*pErrorCode = U_BUFFER_OVERFLOW_ERROR;
|
|
return NULL;
|
|
}
|
|
|
|
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++=(UChar)ch;
|
|
} else if(ch < 0xe0) { /* U+0080..U+07FF */
|
|
/* 0x3080 = (0xc0 << 6) + 0x80 */
|
|
*pDest++ = (UChar)((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 (UChar) */
|
|
/* 0x2080 = (0x80 << 6) + 0x80 */
|
|
ch = (ch << 12) + (*pSrc++ << 6);
|
|
*pDest++ = (UChar)(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++=(UChar)ch;
|
|
continue;
|
|
} else if(ch < 0xe0) { /* U+0080..U+07FF */
|
|
if(pSrc < pSrcLimit) {
|
|
/* 0x3080 = (0xc0 << 6) + 0x80 */
|
|
*pDest++ = (UChar)((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 (UChar) */
|
|
/* 0x2080 = (0x80 << 6) + 0x80 */
|
|
ch = (ch << 12) + (*pSrc++ << 6);
|
|
*pDest++ = (UChar)(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++=(uint8_t)c;
|
|
} else if(c<=0x7ff) {
|
|
*pDest++=(uint8_t)((c>>6)|0xc0);
|
|
*pDest++=(uint8_t)((c&0x3f)|0x80);
|
|
} else if(c<=0xffff) {
|
|
*pDest++=(uint8_t)((c>>12)|0xe0);
|
|
*pDest++=(uint8_t)(((c>>6)&0x3f)|0x80);
|
|
*pDest++=(uint8_t)(((c)&0x3f)|0x80);
|
|
} else /* if((uint32_t)(c)<=0x10ffff) */ {
|
|
*pDest++=(uint8_t)(((c)>>18)|0xf0);
|
|
*pDest++=(uint8_t)((((c)>>12)&0x3f)|0x80);
|
|
*pDest++=(uint8_t)((((c)>>6)&0x3f)|0x80);
|
|
*pDest++=(uint8_t)(((c)&0x3f)|0x80);
|
|
}
|
|
return pDest;
|
|
}
|
|
|
|
|
|
U_CAPI char* U_EXPORT2
|
|
u_strToUTF8WithSub(char *dest,
|
|
int32_t destCapacity,
|
|
int32_t *pDestLength,
|
|
const UChar *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!=NULL)?(pDest + destCapacity):NULL;
|
|
int32_t numSubstitutions;
|
|
|
|
/* args check */
|
|
if(U_FAILURE(*pErrorCode)){
|
|
return NULL;
|
|
}
|
|
|
|
if( (pSrc==NULL && srcLength!=0) || srcLength < -1 ||
|
|
(destCapacity<0) || (dest == NULL && destCapacity > 0) ||
|
|
subchar > 0x10ffff || U_IS_SURROGATE(subchar)
|
|
) {
|
|
*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return NULL;
|
|
}
|
|
|
|
if(pNumSubstitutions!=NULL) {
|
|
*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 NULL;
|
|
}
|
|
|
|
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 NULL;
|
|
}
|
|
}
|
|
} else {
|
|
const UChar *pSrcLimit = (pSrc!=NULL)?(pSrc+srcLength):NULL;
|
|
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 UChar, 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 NULL;
|
|
}
|
|
|
|
/* 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) {
|
|
ch=subchar;
|
|
++numSubstitutions;
|
|
} else {
|
|
/* Unicode 3.2 forbids surrogate code points in UTF-8 */
|
|
*pErrorCode = U_INVALID_CHAR_FOUND;
|
|
return NULL;
|
|
}
|
|
|
|
length = U8_LENGTH(ch);
|
|
if((pDestLimit - pDest) >= length) {
|
|
/* convert and append*/
|
|
pDest=_appendUTF8(pDest, ch);
|
|
} else {
|
|
reqLength = length;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
while(pSrc<pSrcLimit) {
|
|
ch=*pSrc++;
|
|
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) && pSrc<pSrcLimit && 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 NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
reqLength+=(int32_t)(pDest - (uint8_t *)dest);
|
|
|
|
if(pNumSubstitutions!=NULL) {
|
|
*pNumSubstitutions=numSubstitutions;
|
|
}
|
|
|
|
if(pDestLength){
|
|
*pDestLength = reqLength;
|
|
}
|
|
|
|
/* Terminate the buffer */
|
|
u_terminateChars(dest, destCapacity, reqLength, pErrorCode);
|
|
return dest;
|
|
}
|
|
|
|
U_CAPI char* U_EXPORT2
|
|
u_strToUTF8(char *dest,
|
|
int32_t destCapacity,
|
|
int32_t *pDestLength,
|
|
const UChar *pSrc,
|
|
int32_t srcLength,
|
|
UErrorCode *pErrorCode){
|
|
return u_strToUTF8WithSub(
|
|
dest, destCapacity, pDestLength,
|
|
pSrc, srcLength,
|
|
U_SENTINEL, NULL,
|
|
pErrorCode);
|
|
}
|
|
|
|
U_CAPI UChar* U_EXPORT2
|
|
u_strFromJavaModifiedUTF8WithSub(
|
|
UChar *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 NULL;
|
|
}
|
|
if( (src==NULL && srcLength!=0) || srcLength < -1 ||
|
|
(dest==NULL && destCapacity!=0) || destCapacity<0 ||
|
|
subchar > 0x10ffff || U_IS_SURROGATE(subchar)
|
|
) {
|
|
*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return NULL;
|
|
}
|
|
|
|
if(pNumSubstitutions!=NULL) {
|
|
*pNumSubstitutions=0;
|
|
}
|
|
UChar *pDest = dest;
|
|
UChar *pDestLimit = dest+destCapacity;
|
|
int32_t reqLength = 0;
|
|
int32_t numSubstitutions=0;
|
|
|
|
if(srcLength < 0) {
|
|
/*
|
|
* Transform a NUL-terminated ASCII string.
|
|
* Handle non-ASCII strings with slower code.
|
|
*/
|
|
UChar32 c;
|
|
while(((c = (uint8_t)*src) != 0) && c <= 0x7f && (pDest < pDestLimit)) {
|
|
*pDest++=(UChar)c;
|
|
++src;
|
|
}
|
|
if(c == 0) {
|
|
reqLength=(int32_t)(pDest - dest);
|
|
if(pDestLength) {
|
|
*pDestLength = reqLength;
|
|
}
|
|
|
|
/* Terminate the buffer */
|
|
u_terminateUChars(dest, destCapacity, reqLength, pErrorCode);
|
|
return dest;
|
|
}
|
|
srcLength = static_cast<int32_t>(uprv_strlen(src));
|
|
}
|
|
|
|
/* Faster loop without ongoing checking for srcLength and pDestLimit. */
|
|
UChar32 ch;
|
|
uint8_t t1, t2;
|
|
int32_t i = 0;
|
|
for(;;) {
|
|
int32_t count = (int32_t)(pDestLimit - pDest);
|
|
int32_t count2 = srcLength - i;
|
|
if(count >= count2 && srcLength > 0 && U8_IS_SINGLE(*src)) {
|
|
/* fast ASCII loop */
|
|
int32_t start = i;
|
|
uint8_t b;
|
|
while(i < srcLength && U8_IS_SINGLE(b = src[i])) {
|
|
*pDest++=b;
|
|
++i;
|
|
}
|
|
int32_t delta = i - start;
|
|
count -= delta;
|
|
count2 -= delta;
|
|
}
|
|
/*
|
|
* Each iteration of the inner loop progresses by at most 3 UTF-8
|
|
* bytes and one UChar.
|
|
*/
|
|
if(subchar > 0xFFFF) {
|
|
break;
|
|
}
|
|
count2 /= 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 {
|
|
ch = (uint8_t)src[i++];
|
|
if(U8_IS_SINGLE(ch)) {
|
|
*pDest++=(UChar)ch;
|
|
} else {
|
|
if(ch >= 0xe0) {
|
|
if( /* handle U+0000..U+FFFF inline */
|
|
ch <= 0xef &&
|
|
(t1 = (uint8_t)(src[i] - 0x80)) <= 0x3f &&
|
|
(t2 = (uint8_t)(src[i+1] - 0x80)) <= 0x3f
|
|
) {
|
|
/* no need for (ch & 0xf) because the upper bits are truncated after <<12 in the cast to (UChar) */
|
|
*pDest++ = (UChar)((ch << 12) | (t1 << 6) | t2);
|
|
i += 2;
|
|
continue;
|
|
}
|
|
} else {
|
|
if( /* handle U+0000..U+07FF inline */
|
|
ch >= 0xc0 &&
|
|
(t1 = (uint8_t)(src[i] - 0x80)) <= 0x3f
|
|
) {
|
|
*pDest++ = (UChar)(((ch & 0x1f) << 6) | t1);
|
|
++i;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if(subchar < 0) {
|
|
*pErrorCode = U_INVALID_CHAR_FOUND;
|
|
return NULL;
|
|
} else if(subchar > 0xffff && --count == 0) {
|
|
/*
|
|
* We need to write two UChars, adjusted count for that,
|
|
* and ran out of space.
|
|
*/
|
|
--i; // back out byte ch
|
|
break;
|
|
} else {
|
|
/* function call for error cases */
|
|
utf8_nextCharSafeBody((const uint8_t *)src, &(i), srcLength, ch, -1);
|
|
++numSubstitutions;
|
|
*(pDest++)=(UChar)subchar;
|
|
}
|
|
}
|
|
} while(--count > 0);
|
|
}
|
|
|
|
while(i < srcLength && (pDest < pDestLimit)) {
|
|
ch = (uint8_t)src[i++];
|
|
if(U8_IS_SINGLE(ch)){
|
|
*pDest++=(UChar)ch;
|
|
} else {
|
|
if(ch >= 0xe0) {
|
|
if( /* handle U+0000..U+FFFF inline */
|
|
ch <= 0xef &&
|
|
(i+1) < srcLength &&
|
|
(t1 = (uint8_t)(src[i] - 0x80)) <= 0x3f &&
|
|
(t2 = (uint8_t)(src[i+1] - 0x80)) <= 0x3f
|
|
) {
|
|
/* no need for (ch & 0xf) because the upper bits are truncated after <<12 in the cast to (UChar) */
|
|
*pDest++ = (UChar)((ch << 12) | (t1 << 6) | t2);
|
|
i += 2;
|
|
continue;
|
|
}
|
|
} else {
|
|
if( /* handle U+0000..U+07FF inline */
|
|
ch >= 0xc0 &&
|
|
i < srcLength &&
|
|
(t1 = (uint8_t)(src[i] - 0x80)) <= 0x3f
|
|
) {
|
|
*pDest++ = (UChar)(((ch & 0x1f) << 6) | t1);
|
|
++i;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if(subchar < 0) {
|
|
*pErrorCode = U_INVALID_CHAR_FOUND;
|
|
return NULL;
|
|
} else {
|
|
/* function call for error cases */
|
|
utf8_nextCharSafeBody((const uint8_t *)src, &(i), srcLength, ch, -1);
|
|
++numSubstitutions;
|
|
if(subchar<=0xFFFF) {
|
|
*(pDest++)=(UChar)subchar;
|
|
} else {
|
|
*(pDest++)=U16_LEAD(subchar);
|
|
if(pDest<pDestLimit) {
|
|
*(pDest++)=U16_TRAIL(subchar);
|
|
} else {
|
|
reqLength++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Pre-flight the rest of the string. */
|
|
while(i < srcLength) {
|
|
ch = (uint8_t)src[i++];
|
|
if(U8_IS_SINGLE(ch)) {
|
|
reqLength++;
|
|
} else {
|
|
if(ch >= 0xe0) {
|
|
if( /* handle U+0000..U+FFFF inline */
|
|
ch <= 0xef &&
|
|
(i+1) < srcLength &&
|
|
(uint8_t)(src[i] - 0x80) <= 0x3f &&
|
|
(uint8_t)(src[i+1] - 0x80) <= 0x3f
|
|
) {
|
|
reqLength++;
|
|
i += 2;
|
|
continue;
|
|
}
|
|
} else {
|
|
if( /* handle U+0000..U+07FF inline */
|
|
ch >= 0xc0 &&
|
|
i < srcLength &&
|
|
(uint8_t)(src[i] - 0x80) <= 0x3f
|
|
) {
|
|
reqLength++;
|
|
++i;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if(subchar < 0) {
|
|
*pErrorCode = U_INVALID_CHAR_FOUND;
|
|
return NULL;
|
|
} else {
|
|
/* function call for error cases */
|
|
utf8_nextCharSafeBody((const uint8_t *)src, &(i), srcLength, ch, -1);
|
|
++numSubstitutions;
|
|
reqLength+=U16_LENGTH(ch);
|
|
}
|
|
}
|
|
}
|
|
|
|
if(pNumSubstitutions!=NULL) {
|
|
*pNumSubstitutions=numSubstitutions;
|
|
}
|
|
|
|
reqLength+=(int32_t)(pDest - dest);
|
|
if(pDestLength) {
|
|
*pDestLength = reqLength;
|
|
}
|
|
|
|
/* Terminate the buffer */
|
|
u_terminateUChars(dest, destCapacity, reqLength, pErrorCode);
|
|
return dest;
|
|
}
|
|
|
|
U_CAPI char* U_EXPORT2
|
|
u_strToJavaModifiedUTF8(
|
|
char *dest,
|
|
int32_t destCapacity,
|
|
int32_t *pDestLength,
|
|
const UChar *src,
|
|
int32_t srcLength,
|
|
UErrorCode *pErrorCode) {
|
|
int32_t reqLength=0;
|
|
uint32_t ch=0;
|
|
uint8_t *pDest = (uint8_t *)dest;
|
|
uint8_t *pDestLimit = pDest + destCapacity;
|
|
const UChar *pSrcLimit;
|
|
int32_t count;
|
|
|
|
/* args check */
|
|
if(U_FAILURE(*pErrorCode)){
|
|
return NULL;
|
|
}
|
|
if( (src==NULL && srcLength!=0) || srcLength < -1 ||
|
|
(dest==NULL && destCapacity!=0) || destCapacity<0
|
|
) {
|
|
*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return NULL;
|
|
}
|
|
|
|
if(srcLength==-1) {
|
|
/* Convert NUL-terminated ASCII, then find the string length. */
|
|
while((ch=*src)<=0x7f && ch != 0 && pDest<pDestLimit) {
|
|
*pDest++ = (uint8_t)ch;
|
|
++src;
|
|
}
|
|
if(ch == 0) {
|
|
reqLength=(int32_t)(pDest - (uint8_t *)dest);
|
|
if(pDestLength) {
|
|
*pDestLength = reqLength;
|
|
}
|
|
|
|
/* Terminate the buffer */
|
|
u_terminateChars(dest, destCapacity, reqLength, pErrorCode);
|
|
return dest;
|
|
}
|
|
srcLength = u_strlen(src);
|
|
}
|
|
|
|
/* Faster loop without ongoing checking for pSrcLimit and pDestLimit. */
|
|
pSrcLimit = (src!=NULL)?(src+srcLength):NULL;
|
|
for(;;) {
|
|
count = (int32_t)(pDestLimit - pDest);
|
|
srcLength = (int32_t)(pSrcLimit - src);
|
|
if(count >= srcLength && srcLength > 0 && *src <= 0x7f) {
|
|
/* fast ASCII loop */
|
|
const UChar *prevSrc = src;
|
|
int32_t delta;
|
|
while(src < pSrcLimit && (ch = *src) <= 0x7f && ch != 0) {
|
|
*pDest++=(uint8_t)ch;
|
|
++src;
|
|
}
|
|
delta = (int32_t)(src - prevSrc);
|
|
count -= delta;
|
|
srcLength -= delta;
|
|
}
|
|
/*
|
|
* Each iteration of the inner loop progresses by at most 3 UTF-8
|
|
* bytes and one UChar.
|
|
*/
|
|
count /= 3;
|
|
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=*src++;
|
|
if(ch <= 0x7f && ch != 0) {
|
|
*pDest++ = (uint8_t)ch;
|
|
} else if(ch <= 0x7ff) {
|
|
*pDest++=(uint8_t)((ch>>6)|0xc0);
|
|
*pDest++=(uint8_t)((ch&0x3f)|0x80);
|
|
} else {
|
|
*pDest++=(uint8_t)((ch>>12)|0xe0);
|
|
*pDest++=(uint8_t)(((ch>>6)&0x3f)|0x80);
|
|
*pDest++=(uint8_t)((ch&0x3f)|0x80);
|
|
}
|
|
} while(--count > 0);
|
|
}
|
|
|
|
while(src<pSrcLimit) {
|
|
ch=*src++;
|
|
if(ch <= 0x7f && ch != 0) {
|
|
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((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;
|
|
}
|
|
}
|
|
}
|
|
while(src<pSrcLimit) {
|
|
ch=*src++;
|
|
if(ch <= 0x7f && ch != 0) {
|
|
++reqLength;
|
|
} else if(ch<=0x7ff) {
|
|
reqLength+=2;
|
|
} else {
|
|
reqLength+=3;
|
|
}
|
|
}
|
|
|
|
reqLength+=(int32_t)(pDest - (uint8_t *)dest);
|
|
if(pDestLength){
|
|
*pDestLength = reqLength;
|
|
}
|
|
|
|
/* Terminate the buffer */
|
|
u_terminateChars(dest, destCapacity, reqLength, pErrorCode);
|
|
return dest;
|
|
}
|