//
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// Copyright 2021 Staysail Systems, Inc. <info@staysail.tech>
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// Copyright 2017 Capitar IT Group BV <info@capitar.com>
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//
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// This software is supplied under the terms of the MIT License, a
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// copy of which should be located in the distribution where this
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// file was obtained (LICENSE.txt). A copy of the license may also be
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// found online at https://opensource.org/licenses/MIT.
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//
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#ifndef CORE_MESSAGE_H
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#define CORE_MESSAGE_H
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// Internally used message API. Again, this is not part of our public API.
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// "trim" operations work from the front, and "chop" work from the end.
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extern int nni_msg_alloc(nni_msg **, size_t);
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extern void nni_msg_free(nni_msg *);
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extern int nni_msg_realloc(nni_msg *, size_t);
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extern int nni_msg_reserve(nni_msg *, size_t);
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extern size_t nni_msg_capacity(nni_msg *);
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extern int nni_msg_dup(nni_msg **, const nni_msg *);
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extern void * nni_msg_header(nni_msg *);
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extern size_t nni_msg_header_len(const nni_msg *);
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extern void * nni_msg_body(nni_msg *);
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extern size_t nni_msg_len(const nni_msg *);
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extern int nni_msg_append(nni_msg *, const void *, size_t);
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extern int nni_msg_insert(nni_msg *, const void *, size_t);
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extern int nni_msg_header_append(nni_msg *, const void *, size_t);
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extern int nni_msg_header_insert(nni_msg *, const void *, size_t);
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extern int nni_msg_trim(nni_msg *, size_t);
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extern int nni_msg_chop(nni_msg *, size_t);
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extern void nni_msg_clear(nni_msg *);
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extern void nni_msg_header_clear(nni_msg *);
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extern int nni_msg_header_trim(nni_msg *, size_t);
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extern int nni_msg_header_chop(nni_msg *, size_t);
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extern void nni_msg_dump(const char *, const nni_msg *);
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extern void nni_msg_header_append_u32(nni_msg *, uint32_t);
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extern uint32_t nni_msg_header_trim_u32(nni_msg *);
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extern uint32_t nni_msg_trim_u32(nni_msg *);
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// Peek and poke variants just access the first uint32 in the
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// header. This is useful when incrementing reference counts, etc.
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// It's faster than trim and append, but logically equivalent.
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extern uint32_t nni_msg_header_peek_u32(nni_msg *);
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extern void nni_msg_header_poke_u32(nni_msg *, uint32_t);
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extern void nni_msg_set_pipe(nni_msg *, uint32_t);
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extern uint32_t nni_msg_get_pipe(const nni_msg *);
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// Reference counting messages. This allows the same message to be
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// cheaply reused instead of copied over and over again. Callers of
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// this functionality MUST be certain to use nni_msg_unique() before
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// passing a message out of their control (e.g. to user programs.)
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// Failure to do so will likely result in corruption.
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extern void nni_msg_clone(nni_msg *);
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extern nni_msg *nni_msg_unique(nni_msg *);
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extern bool nni_msg_shared(nni_msg *);
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// nni_msg_pull_up ensures that the message is unique, and that any
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// header present is "pulled up" into the message body. If the function
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// cannot do this for any reason (out of space in the body), then NULL
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// is returned. It is the responsibility of the caller to free the
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// original message in that case (same semantics as realloc).
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extern nni_msg *nni_msg_pull_up(nni_msg *);
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#endif // CORE_SOCKET_H
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