current/deps/icu-small/source/common/ustr_wcs.cpp
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*
* Copyright (C) 2001-2012, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: ustr_wcs.cpp
* encoding: UTF-8
* tab size: 8 (not used)
* indentation:4
*
* created on: 2004sep07
* created by: Markus W. Scherer
*
* u_strToWCS() and u_strFromWCS() functions
* moved here from ustrtrns.c for better modularization.
*/
#include "unicode/utypes.h"
#include "unicode/ustring.h"
#include "cstring.h"
#include "cwchar.h"
#include "cmemory.h"
#include "ustr_imp.h"
#include "ustr_cnv.h"
#if defined(U_WCHAR_IS_UTF16) || defined(U_WCHAR_IS_UTF32) || !UCONFIG_NO_CONVERSION
#define _STACK_BUFFER_CAPACITY 1000
#define _BUFFER_CAPACITY_MULTIPLIER 2
#if !defined(U_WCHAR_IS_UTF16) && !defined(U_WCHAR_IS_UTF32)
// TODO: We should use CharString for char buffers and UnicodeString for UChar buffers.
// Then we could change this to work only with wchar_t buffers.
static inline UBool
u_growAnyBufferFromStatic(void *context,
void **pBuffer, int32_t *pCapacity, int32_t reqCapacity,
int32_t length, int32_t size) {
// Use char* not void* to avoid the compiler's strict-aliasing assumptions
// and related warnings.
char *newBuffer=(char *)uprv_malloc(reqCapacity*size);
if(newBuffer!=NULL) {
if(length>0) {
uprv_memcpy(newBuffer, *pBuffer, (size_t)length*size);
}
*pCapacity=reqCapacity;
} else {
*pCapacity=0;
}
/* release the old pBuffer if it was not statically allocated */
if(*pBuffer!=(char *)context) {
uprv_free(*pBuffer);
}
*pBuffer=newBuffer;
return (UBool)(newBuffer!=NULL);
}
/* helper function */
static wchar_t*
_strToWCS(wchar_t *dest,
int32_t destCapacity,
int32_t *pDestLength,
const UChar *src,
int32_t srcLength,
UErrorCode *pErrorCode){
char stackBuffer [_STACK_BUFFER_CAPACITY];
char* tempBuf = stackBuffer;
int32_t tempBufCapacity = _STACK_BUFFER_CAPACITY;
char* tempBufLimit = stackBuffer + tempBufCapacity;
UConverter* conv = NULL;
char* saveBuf = tempBuf;
wchar_t* intTarget=NULL;
int32_t intTargetCapacity=0;
int count=0,retVal=0;
const UChar *pSrcLimit =NULL;
const UChar *pSrc = src;
conv = u_getDefaultConverter(pErrorCode);
if(U_FAILURE(*pErrorCode)){
return NULL;
}
if(srcLength == -1){
srcLength = u_strlen(pSrc);
}
pSrcLimit = pSrc + srcLength;
for(;;) {
/* reset the error state */
*pErrorCode = U_ZERO_ERROR;
/* convert to chars using default converter */
ucnv_fromUnicode(conv,&tempBuf,tempBufLimit,&pSrc,pSrcLimit,NULL,(UBool)(pSrc==pSrcLimit),pErrorCode);
count =(tempBuf - saveBuf);
/* This should rarely occur */
if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR){
tempBuf = saveBuf;
/* we dont have enough room on the stack grow the buffer */
int32_t newCapacity = 2 * srcLength;
if(newCapacity <= tempBufCapacity) {
newCapacity = _BUFFER_CAPACITY_MULTIPLIER * tempBufCapacity;
}
if(!u_growAnyBufferFromStatic(stackBuffer,(void**) &tempBuf, &tempBufCapacity,
newCapacity, count, 1)) {
goto cleanup;
}
saveBuf = tempBuf;
tempBufLimit = tempBuf + tempBufCapacity;
tempBuf = tempBuf + count;
} else {
break;
}
}
if(U_FAILURE(*pErrorCode)){
goto cleanup;
}
/* done with conversion null terminate the char buffer */
if(count>=tempBufCapacity){
tempBuf = saveBuf;
/* we dont have enough room on the stack grow the buffer */
if(!u_growAnyBufferFromStatic(stackBuffer,(void**) &tempBuf, &tempBufCapacity,
count+1, count, 1)) {
goto cleanup;
}
saveBuf = tempBuf;
}
saveBuf[count]=0;
/* allocate more space than required
* here we assume that every char requires
* no more than 2 wchar_ts
*/
intTargetCapacity = (count * _BUFFER_CAPACITY_MULTIPLIER + 1) /*for null termination */;
intTarget = (wchar_t*)uprv_malloc( intTargetCapacity * sizeof(wchar_t) );
if(intTarget){
int32_t nulLen = 0;
int32_t remaining = intTargetCapacity;
wchar_t* pIntTarget=intTarget;
tempBuf = saveBuf;
/* now convert the mbs to wcs */
for(;;){
/* we can call the system API since we are sure that
* there is atleast 1 null in the input
*/
retVal = uprv_mbstowcs(pIntTarget,(tempBuf+nulLen),remaining);
if(retVal==-1){
*pErrorCode = U_INVALID_CHAR_FOUND;
break;
}else if(retVal== remaining){/* should never occur */
int numWritten = (pIntTarget-intTarget);
u_growAnyBufferFromStatic(NULL,(void**) &intTarget,
&intTargetCapacity,
intTargetCapacity * _BUFFER_CAPACITY_MULTIPLIER,
numWritten,
sizeof(wchar_t));
pIntTarget = intTarget;
remaining=intTargetCapacity;
if(nulLen!=count){ /*there are embedded nulls*/
pIntTarget+=numWritten;
remaining-=numWritten;
}
}else{
int32_t nulVal;
/*scan for nulls */
/* we donot check for limit since tempBuf is null terminated */
while(tempBuf[nulLen++] != 0){
}
nulVal = (nulLen < srcLength) ? 1 : 0;
pIntTarget = pIntTarget + retVal+nulVal;
remaining -=(retVal+nulVal);
/* check if we have reached the source limit*/
if(nulLen>=(count)){
break;
}
}
}
count = (int32_t)(pIntTarget-intTarget);
if(0 < count && count <= destCapacity){
uprv_memcpy(dest, intTarget, (size_t)count*sizeof(wchar_t));
}
if(pDestLength){
*pDestLength = count;
}
/* free the allocated memory */
uprv_free(intTarget);
}else{
*pErrorCode = U_MEMORY_ALLOCATION_ERROR;
}
cleanup:
/* are we still using stack buffer */
if(stackBuffer != saveBuf){
uprv_free(saveBuf);
}
u_terminateWChars(dest,destCapacity,count,pErrorCode);
u_releaseDefaultConverter(conv);
return dest;
}
#endif
U_CAPI wchar_t* U_EXPORT2
u_strToWCS(wchar_t *dest,
int32_t destCapacity,
int32_t *pDestLength,
const UChar *src,
int32_t srcLength,
UErrorCode *pErrorCode){
/* args check */
if(pErrorCode==NULL || 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;
}
#ifdef U_WCHAR_IS_UTF16
/* wchar_t is UTF-16 just do a memcpy */
if(srcLength == -1){
srcLength = u_strlen(src);
}
if(0 < srcLength && srcLength <= destCapacity){
u_memcpy((UChar *)dest, src, srcLength);
}
if(pDestLength){
*pDestLength = srcLength;
}
u_terminateUChars((UChar *)dest,destCapacity,srcLength,pErrorCode);
return dest;
#elif defined U_WCHAR_IS_UTF32
return (wchar_t*)u_strToUTF32((UChar32*)dest, destCapacity, pDestLength,
src, srcLength, pErrorCode);
#else
return _strToWCS(dest,destCapacity,pDestLength,src,srcLength, pErrorCode);
#endif
}
#if !defined(U_WCHAR_IS_UTF16) && !defined(U_WCHAR_IS_UTF32)
/* helper function */
static UChar*
_strFromWCS( UChar *dest,
int32_t destCapacity,
int32_t *pDestLength,
const wchar_t *src,
int32_t srcLength,
UErrorCode *pErrorCode)
{
int32_t retVal =0, count =0 ;
UConverter* conv = NULL;
UChar* pTarget = NULL;
UChar* pTargetLimit = NULL;
UChar* target = NULL;
UChar uStack [_STACK_BUFFER_CAPACITY];
wchar_t wStack[_STACK_BUFFER_CAPACITY];
wchar_t* pWStack = wStack;
char cStack[_STACK_BUFFER_CAPACITY];
int32_t cStackCap = _STACK_BUFFER_CAPACITY;
char* pCSrc=cStack;
char* pCSave=pCSrc;
char* pCSrcLimit=NULL;
const wchar_t* pSrc = src;
const wchar_t* pSrcLimit = NULL;
if(srcLength ==-1){
/* if the wchar_t source is null terminated we can safely
* assume that there are no embedded nulls, this is a fast
* path for null terminated strings.
*/
for(;;){
/* convert wchars to chars */
retVal = uprv_wcstombs(pCSrc,src, cStackCap);
if(retVal == -1){
*pErrorCode = U_ILLEGAL_CHAR_FOUND;
goto cleanup;
}else if(retVal >= (cStackCap-1)){
/* Should rarely occur */
u_growAnyBufferFromStatic(cStack,(void**)&pCSrc,&cStackCap,
cStackCap * _BUFFER_CAPACITY_MULTIPLIER, 0, sizeof(char));
pCSave = pCSrc;
}else{
/* converted every thing */
pCSrc = pCSrc+retVal;
break;
}
}
}else{
/* here the source is not null terminated
* so it may have nulls embeded and we need to
* do some extra processing
*/
int32_t remaining =cStackCap;
pSrcLimit = src + srcLength;
for(;;){
int32_t nulLen = 0;
/* find nulls in the string */
while(nulLen<srcLength && pSrc[nulLen++]!=0){
}
if((pSrc+nulLen) < pSrcLimit){
/* check if we have enough room in pCSrc */
if(remaining < (nulLen * MB_CUR_MAX)){
/* should rarely occur */
int32_t len = (pCSrc-pCSave);
pCSrc = pCSave;
/* we do not have enough room so grow the buffer*/
u_growAnyBufferFromStatic(cStack,(void**)&pCSrc,&cStackCap,
_BUFFER_CAPACITY_MULTIPLIER*cStackCap+(nulLen*MB_CUR_MAX),len,sizeof(char));
pCSave = pCSrc;
pCSrc = pCSave+len;
remaining = cStackCap-(pCSrc - pCSave);
}
/* we have found a null so convert the
* chunk from begining of non-null char to null
*/
retVal = uprv_wcstombs(pCSrc,pSrc,remaining);
if(retVal==-1){
/* an error occurred bail out */
*pErrorCode = U_ILLEGAL_CHAR_FOUND;
goto cleanup;
}
pCSrc += retVal+1 /* already null terminated */;
pSrc += nulLen; /* skip past the null */
srcLength-=nulLen; /* decrement the srcLength */
remaining -= (pCSrc-pCSave);
}else{
/* the source is not null terminated and we are
* end of source so we copy the source to a temp buffer
* null terminate it and convert wchar_ts to chars
*/
if(nulLen >= _STACK_BUFFER_CAPACITY){
/* Should rarely occcur */
/* allocate new buffer buffer */
pWStack =(wchar_t*) uprv_malloc(sizeof(wchar_t) * (nulLen + 1));
if(pWStack==NULL){
*pErrorCode = U_MEMORY_ALLOCATION_ERROR;
goto cleanup;
}
}
if(nulLen>0){
/* copy the contents to tempStack */
uprv_memcpy(pWStack, pSrc, (size_t)nulLen*sizeof(wchar_t));
}
/* null terminate the tempBuffer */
pWStack[nulLen] =0 ;
if(remaining < (nulLen * MB_CUR_MAX)){
/* Should rarely occur */
int32_t len = (pCSrc-pCSave);
pCSrc = pCSave;
/* we do not have enough room so grow the buffer*/
u_growAnyBufferFromStatic(cStack,(void**)&pCSrc,&cStackCap,
cStackCap+(nulLen*MB_CUR_MAX),len,sizeof(char));
pCSave = pCSrc;
pCSrc = pCSave+len;
remaining = cStackCap-(pCSrc - pCSave);
}
/* convert to chars */
retVal = uprv_wcstombs(pCSrc,pWStack,remaining);
pCSrc += retVal;
pSrc += nulLen;
srcLength-=nulLen; /* decrement the srcLength */
break;
}
}
}
/* OK..now we have converted from wchar_ts to chars now
* convert chars to UChars
*/
pCSrcLimit = pCSrc;
pCSrc = pCSave;
pTarget = target= dest;
pTargetLimit = dest + destCapacity;
conv= u_getDefaultConverter(pErrorCode);
if(U_FAILURE(*pErrorCode)|| conv==NULL){
goto cleanup;
}
for(;;) {
*pErrorCode = U_ZERO_ERROR;
/* convert to stack buffer*/
ucnv_toUnicode(conv,&pTarget,pTargetLimit,(const char**)&pCSrc,pCSrcLimit,NULL,(UBool)(pCSrc==pCSrcLimit),pErrorCode);
/* increment count to number written to stack */
count+= pTarget - target;
if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR){
target = uStack;
pTarget = uStack;
pTargetLimit = uStack + _STACK_BUFFER_CAPACITY;
} else {
break;
}
}
if(pDestLength){
*pDestLength =count;
}
u_terminateUChars(dest,destCapacity,count,pErrorCode);
cleanup:
if(cStack != pCSave){
uprv_free(pCSave);
}
if(wStack != pWStack){
uprv_free(pWStack);
}
u_releaseDefaultConverter(conv);
return dest;
}
#endif
U_CAPI UChar* U_EXPORT2
u_strFromWCS(UChar *dest,
int32_t destCapacity,
int32_t *pDestLength,
const wchar_t *src,
int32_t srcLength,
UErrorCode *pErrorCode)
{
/* args check */
if(pErrorCode==NULL || 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;
}
#ifdef U_WCHAR_IS_UTF16
/* wchar_t is UTF-16 just do a memcpy */
if(srcLength == -1){
srcLength = u_strlen((const UChar *)src);
}
if(0 < srcLength && srcLength <= destCapacity){
u_memcpy(dest, (const UChar *)src, srcLength);
}
if(pDestLength){
*pDestLength = srcLength;
}
u_terminateUChars(dest,destCapacity,srcLength,pErrorCode);
return dest;
#elif defined U_WCHAR_IS_UTF32
return u_strFromUTF32(dest, destCapacity, pDestLength,
(UChar32*)src, srcLength, pErrorCode);
#else
return _strFromWCS(dest,destCapacity,pDestLength,src,srcLength,pErrorCode);
#endif
}
#endif /* #if !defined(U_WCHAR_IS_UTF16) && !defined(U_WCHAR_IS_UTF32) && !UCONFIG_NO_CONVERSION */