NS_IMETHODIMP
nsSaveAsCharset::DoConversionFallBack(PRUint32 inUCS4, char *outString, PRInt32 bufferLength)
{
NS_ASSERTION(outString, "invalid input");
if(nullptr == outString )
return NS_ERROR_NULL_POINTER;
*outString = '\0';
nsresult rv = NS_OK;
if (ATTR_NO_FALLBACK(mAttribute)) {
return NS_OK;
}
if (attr_EntityAfterCharsetConv == MASK_ENTITY(mAttribute)) {
char *entity = NULL;
rv = mEntityConverter->ConvertUTF32ToEntity(inUCS4, mEntityVersion, &entity);
if (NS_SUCCEEDED(rv)) {
if (NULL == entity || (PRInt32)strlen(entity) > bufferLength) {
return NS_ERROR_OUT_OF_MEMORY;
}
PL_strcpy(outString, entity);
nsMemory::Free(entity);
return rv;
}
}
switch (MASK_FALLBACK(mAttribute)) {
case attr_FallbackQuestionMark:
if(bufferLength>=2) {
*outString++='?';
*outString='\0';
rv = NS_OK;
} else {
rv = NS_ERROR_FAILURE;
}
break;
case attr_FallbackEscapeU:
if (inUCS4 & 0xff0000)
rv = (PR_snprintf(outString, bufferLength, "\\u%.6x", inUCS4) > 0) ? NS_OK : NS_ERROR_FAILURE;
else
rv = (PR_snprintf(outString, bufferLength, "\\u%.4x", inUCS4) > 0) ? NS_OK : NS_ERROR_FAILURE;
break;
case attr_FallbackDecimalNCR:
rv = ( PR_snprintf(outString, bufferLength, "&#%u;", inUCS4) > 0) ? NS_OK : NS_ERROR_FAILURE;
break;
case attr_FallbackHexNCR:
rv = (PR_snprintf(outString, bufferLength, "&#x%x;", inUCS4) > 0) ? NS_OK : NS_ERROR_FAILURE;
break;
case attr_FallbackNone:
rv = NS_OK;
break;
default:
rv = NS_ERROR_ILLEGAL_VALUE;
break;
}
return rv;
}
NS_IMETHODIMP
nsSaveAsCharset::DoCharsetConversion(const char16_t *inString, char **outString)
{
NS_ENSURE_ARG_POINTER(outString);
*outString = nullptr;
nsresult rv;
int32_t inStringLength = NS_strlen(inString); // original input string length
int32_t bufferLength; // allocated buffer length
int32_t srcLength = inStringLength;
int32_t dstLength;
int32_t pos1, pos2;
nsresult saveResult = NS_OK; // to remember NS_ERROR_UENC_NOMAPPING
// estimate and allocate the target buffer (reserve extra memory for fallback)
rv = mEncoder->GetMaxLength(inString, inStringLength, &dstLength);
if (NS_FAILED(rv)) return rv;
bufferLength = dstLength + RESERVE_FALLBACK_BYTES; // extra bytes for fallback
// + 1 is for the terminating NUL -- we don't add that to bufferLength so that
// we can always write dstPtr[pos2] = '\0' even when the encoder filled the
// buffer.
char *dstPtr = (char *) PR_Malloc(bufferLength + 1);
if (!dstPtr) {
return NS_ERROR_OUT_OF_MEMORY;
}
for (pos1 = 0, pos2 = 0; pos1 < inStringLength;) {
// convert from unicode
dstLength = bufferLength - pos2;
NS_ASSERTION(dstLength >= 0, "out of bounds write");
rv = mEncoder->Convert(&inString[pos1], &srcLength, &dstPtr[pos2], &dstLength);
pos1 += srcLength ? srcLength : 1;
pos2 += dstLength;
dstPtr[pos2] = '\0';
// break: this is usually the case (no error) OR unrecoverable error
if (NS_ERROR_UENC_NOMAPPING != rv) break;
// remember this happened and reset the result
saveResult = rv;
rv = NS_OK;
// finish encoder, give it a chance to write extra data like escape sequences
dstLength = bufferLength - pos2;
rv = mEncoder->Finish(&dstPtr[pos2], &dstLength);
if (NS_SUCCEEDED(rv)) {
pos2 += dstLength;
dstPtr[pos2] = '\0';
}
srcLength = inStringLength - pos1;
// do the fallback
if (!ATTR_NO_FALLBACK(mAttribute)) {
uint32_t unMappedChar;
if (NS_IS_HIGH_SURROGATE(inString[pos1-1]) &&
inStringLength > pos1 && NS_IS_LOW_SURROGATE(inString[pos1])) {
unMappedChar = SURROGATE_TO_UCS4(inString[pos1-1], inString[pos1]);
pos1++;
} else {
unMappedChar = inString[pos1-1];
}
rv = mEncoder->GetMaxLength(inString+pos1, inStringLength-pos1, &dstLength);
if (NS_FAILED(rv))
break;
rv = HandleFallBack(unMappedChar, &dstPtr, &bufferLength, &pos2, dstLength);
if (NS_FAILED(rv))
break;
dstPtr[pos2] = '\0';
}
}
if (NS_SUCCEEDED(rv)) {
// finish encoder, give it a chance to write extra data like escape sequences
dstLength = bufferLength - pos2;
rv = mEncoder->Finish(&dstPtr[pos2], &dstLength);
if (NS_SUCCEEDED(rv)) {
pos2 += dstLength;
dstPtr[pos2] = '\0';
}
}
if (NS_FAILED(rv)) {
PR_FREEIF(dstPtr);
return rv;
}
*outString = dstPtr; // set the result string
// set error code so that the caller can do own fall back
if (NS_ERROR_UENC_NOMAPPING == saveResult) {
rv = NS_ERROR_UENC_NOMAPPING;
}
return rv;
}
NS_IMETHODIMP
nsSaveAsCharset::DoCharsetConversion(const PRUnichar *inString, char **outString)
{
if(nullptr == outString )
return NS_ERROR_NULL_POINTER;
NS_ASSERTION(outString, "invalid input");
*outString = NULL;
nsresult rv;
PRInt32 inStringLength = NS_strlen(inString); // original input string length
PRInt32 bufferLength; // allocated buffer length
PRInt32 srcLength = inStringLength;
PRInt32 dstLength;
char *dstPtr = NULL;
PRInt32 pos1, pos2;
nsresult saveResult = NS_OK; // to remember NS_ERROR_UENC_NOMAPPING
// estimate and allocate the target buffer (reserve extra memory for fallback)
rv = mEncoder->GetMaxLength(inString, inStringLength, &dstLength);
if (NS_FAILED(rv)) return rv;
bufferLength = dstLength + 512; // reserve 512 byte for fallback.
dstPtr = (char *) PR_Malloc(bufferLength);
if (NULL == dstPtr) return NS_ERROR_OUT_OF_MEMORY;
for (pos1 = 0, pos2 = 0; pos1 < inStringLength;) {
// convert from unicode
dstLength = bufferLength - pos2;
rv = mEncoder->Convert(&inString[pos1], &srcLength, &dstPtr[pos2], &dstLength);
pos1 += srcLength ? srcLength : 1;
pos2 += dstLength;
dstPtr[pos2] = '\0';
// break: this is usually the case (no error) OR unrecoverable error
if (NS_ERROR_UENC_NOMAPPING != rv) break;
// remember this happened and reset the result
saveResult = rv;
rv = NS_OK;
// finish encoder, give it a chance to write extra data like escape sequences
dstLength = bufferLength - pos2;
rv = mEncoder->Finish(&dstPtr[pos2], &dstLength);
if (NS_SUCCEEDED(rv)) {
pos2 += dstLength;
dstPtr[pos2] = '\0';
}
srcLength = inStringLength - pos1;
// do the fallback
if (!ATTR_NO_FALLBACK(mAttribute)) {
PRUint32 unMappedChar;
if (NS_IS_HIGH_SURROGATE(inString[pos1-1]) &&
inStringLength > pos1 && NS_IS_LOW_SURROGATE(inString[pos1])) {
unMappedChar = SURROGATE_TO_UCS4(inString[pos1-1], inString[pos1]);
pos1++;
} else {
unMappedChar = inString[pos1-1];
}
rv = mEncoder->GetMaxLength(inString+pos1, inStringLength-pos1, &dstLength);
if (NS_FAILED(rv))
break;
rv = HandleFallBack(unMappedChar, &dstPtr, &bufferLength, &pos2, dstLength);
if (NS_FAILED(rv))
break;
dstPtr[pos2] = '\0';
}
}
if (NS_SUCCEEDED(rv)) {
// finish encoder, give it a chance to write extra data like escape sequences
dstLength = bufferLength - pos2;
rv = mEncoder->Finish(&dstPtr[pos2], &dstLength);
if (NS_SUCCEEDED(rv)) {
pos2 += dstLength;
dstPtr[pos2] = '\0';
}
}
if (NS_FAILED(rv)) {
PR_FREEIF(dstPtr);
return rv;
}
*outString = dstPtr; // set the result string
// set error code so that the caller can do own fall back
if (NS_ERROR_UENC_NOMAPPING == saveResult) {
rv = NS_ERROR_UENC_NOMAPPING;
}
return rv;
}
