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* chksum.c (sha256_stream_impl): New static function, formed
out of bulk of sha256_stream. Takes a pointer to a buffer
where the digest is stored.
(sha256_ensure_buf): New static function.
(sha256_stream): Take buf argument; use sha256_ensure_buf to
allocate a buffer if necessary, and to obtain the low-level
buffer pointer. Implementation moved into sha256_stream_impl.
(sha256_buf, sha256_str): Take pointer to digest buffer; don't
allocate a buf object, don't return anything.
(sha256): Take buf argument; use sha256_ensure_buf to
allocate a buffer if necessary, and to obtain the low-level
buffer pointer, which is passed to sha256_buf and sha256_str.
(chksum_init): Update registrations of intrinsics with new
optional parameters.
* chksum.h (sha256_stream, sha256): Declarations updated.
* txr.1: Updated.
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