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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