uint32_t
CalcUTF8ToUnicodeLength( const nsACString& aSource)
{
nsACString::const_iterator start, end;
CalculateUTF8Length calculator;
copy_string(aSource.BeginReading(start), aSource.EndReading(end),
calculator);
return calculator.Length();
}
bool
AppendUTF8toUTF16( const nsACString& aSource, nsAString& aDest,
const mozilla::fallible_t& )
{
nsACString::const_iterator source_start, source_end;
CalculateUTF8Length calculator;
copy_string(aSource.BeginReading(source_start),
aSource.EndReading(source_end), calculator);
uint32_t count = calculator.Length();
// Avoid making the string mutable if we're appending an empty string
if (count)
{
uint32_t old_dest_length = aDest.Length();
// Grow the buffer if we need to.
if (!aDest.SetLength(old_dest_length + count, mozilla::fallible_t())) {
return false;
}
// All ready? Time to convert
ConvertUTF8toUTF16 converter(aDest.BeginWriting() + old_dest_length);
copy_string(aSource.BeginReading(source_start),
aSource.EndReading(source_end), converter);
NS_ASSERTION(converter.ErrorEncountered() ||
converter.Length() == count,
"CalculateUTF8Length produced the wrong length");
if (converter.ErrorEncountered())
{
NS_ERROR("Input wasn't UTF8 or incorrect length was calculated");
aDest.SetLength(old_dest_length);
}
}
return true;
}
PRUnichar*
UTF8ToNewUnicode( const nsACString& aSource, PRUint32 *aUTF16Count )
{
nsACString::const_iterator start, end;
CalculateUTF8Length calculator;
copy_string(aSource.BeginReading(start), aSource.EndReading(end),
calculator);
if (aUTF16Count)
*aUTF16Count = calculator.Length();
PRUnichar *result = static_cast<PRUnichar*>
(nsMemory::Alloc(sizeof(PRUnichar) * (calculator.Length() + 1)));
if (!result)
return nsnull;
ConvertUTF8toUTF16 converter(result);
copy_string(aSource.BeginReading(start), aSource.EndReading(end),
converter).write_terminator();
NS_ASSERTION(calculator.Length() == converter.Length(), "length mismatch");
return result;
}
