Re: Best Way to Append Bytes With Encoding To CFMutableString
Re: Best Way to Append Bytes With Encoding To CFMutableString
- Subject: Re: Best Way to Append Bytes With Encoding To CFMutableString
- From: Charles Srstka <email@hidden>
- Date: Wed, 28 Mar 2012 13:00:51 -0500
On Mar 28, 2012, at 9:55 AM, email@hidden wrote:
> On 28 Mar 2012, at 15:35, Andreas Grosam wrote:
>
>>
>> On Mar 28, 2012, at 3:58 PM, email@hidden wrote:
>>>>
>>> I presume that you considered CFStringAppendCString():
>>>
>>> void CFStringAppendCString (
>>> CFMutableStringRef theString,
>>> const char *cStr,
>>> CFStringEncoding encoding
>>> );
>>>
>>
>>
>> Yes, but:
>>
>> Can I use any code-unit, even so the function indicates that only "char" is allowed? What, if I have uint32_t or uint16_t code-unit types? (I guess, I can use them anyway after a type cast.) The description is not clear about this, though.
> The fact that the function supports encoding presumably entails support for non char code-unit types.
> If not, this is a pretty sterile function.
>
>>
>> Also, consider that Unicode NULL (U+0000) is a regular character in Unicode - which conflicts with C strings which shall be zero terminated.
> A valid point. I don't know how the Unicode NULL is generally used in practice.
Unicode NULL is the least of your problems. In UTF16, each character in the normal ASCII range is going to contain a zero as one of its two bytes (which one, of course, depending on whether the encoding is big- or little-endian). CFStringAppendCString(), along with the other functions that take C strings, stops at the first zero byte it hits, which means that unless your entire file is in a non-Western script, it’s going to get cut short.
CFAppendCString() is not what you want if you might be using UTF16.
Charles
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