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/usr/include/dovecot/message-header-hash.h is in dovecot-dev 1:2.2.22-1ubuntu2.

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#ifndef MESSAGE_HEADER_HASH_H
#define MESSAGE_HEADER_HASH_H

struct hash_method;

void message_header_hash_more(const struct hash_method *method, void *context,
			      unsigned int version,
			      const unsigned char *data, size_t size);

#endif