utf7_helper.h

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#ifndef MBFL_UTF7_HELPER_H
#define MBFL_UTF7_HELPER_H
 
#include "mbfilter.h"
 
/* Ways which a Base64-encoded section can end: */
#define DASH 0xFC
#define DIRECT 0xFD
#define ASCII 0xFE
#define ILLEGAL 0xFF
 
static inline bool is_base64_end_valid(unsigned char n, bool gap, bool is_surrogate)
{
    return !(gap || is_surrogate || n == ASCII || n == ILLEGAL);
}
 
static inline bool has_surrogate(uint16_t cp, bool is_surrogate)
{
    return !is_surrogate && cp >= 0xD800 && cp <= 0xDBFF;
}
 
#endif /* MBFL_UTF7_HELPER_H */