I have taken some time to investigate this issue and the problem is that you
use the "isalpha" function in the is_mime_char routine:
```C
#define is_mime_char(_c_) \
(isalpha((int)_c_) || (_c_)=='-' || (_c_)=='+' || (_c_)=='.' ||
(_c_)=='_')
```
But a MIME type can have digits in it (as you can see in some MIME types
registered with IANA:
http://www.iana.org/assignments/media-types/media-types.xhtml)
So a more convenient validation function would be "isalnum":
```C
#define is_mime_char(_c_) \
(isalnum((int)_c_) || (_c_)=='-' || (_c_)=='+' || (_c_)=='.' ||
(_c_)=='_')
```
After changing this, there is no more parsing errors.
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