/usr/include/dovecot/istream-sized.h is in dovecot-dev 1:2.2.9-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #ifndef ISTREAM_SIZED_H
#define ISTREAM_SIZED_H
/* Assume that input is exactly the given size. If it's smaller, log an error
and fail with EINVAL error. If it's larger, log an error but don't fail. */
struct istream *i_stream_create_sized(struct istream *input, uoff_t size);
#endif
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