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cb9debc229
Trying to rework the TLV streams to have a more homogenous interface to work with. This is by no means a complete implementation, just the groundwork that is going to be used by the wire code generator to generate the specific accessors, but it's enough so we can manipulate TLV streams in the onion and later just switch to the generated ones.
55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
#ifndef LIGHTNING_WIRE_TLVSTREAM_H
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#define LIGHTNING_WIRE_TLVSTREAM_H
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#include "config.h"
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#include <bitcoin/short_channel_id.h>
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#include <ccan/short_types/short_types.h>
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#include <ccan/tal/tal.h>
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struct tlv_record_type {
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u64 type;
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/* If this type is present return marshalled value. Otherwise
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* returns NULL. */
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u8 *(*towire)(const tal_t *ctx, const void *record);
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/* Must call fromwire_fail() if it can't parse. */
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void (*fromwire)(const u8 **cursor, size_t *max, void *record);
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};
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/* A single TLV field, consisting of the data and its associated metadata. */
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struct tlv_field {
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/* If this is a type that is known to c-lightning we have a pointer to
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* the metadata. */
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const struct tlv_record_type *meta;
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/* In any case we'll have the numeric type, even if we don't have a
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* name that we can call it. */
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u64 numtype;
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size_t length;
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u8 *value;
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};
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/* Append a stream of tlvs: types[] must be in increasing type order! */
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void towire_tlvs(u8 **pptr,
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const struct tlv_record_type types[],
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size_t num_types,
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const void *record);
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/* Given any tlvstream serialize the raw fields (untyped ones). */
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void towire_tlvstream_raw(u8 **pptr, const struct tlv_field *fields);
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/* Generic primitive setters for tlvstreams. */
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void tlvstream_set_raw(struct tlv_field **stream, u64 type, u8 *value TAKES);
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void tlvstream_set_short_channel_id(struct tlv_field **stream, u64 type,
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struct short_channel_id *value);
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void tlvstream_set_tu64(struct tlv_field **stream, u64 type, u64 value);
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void tlvstream_set_tu32(struct tlv_field **stream, u64 type, u32 value);
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/* Generic primitive gettes for tlvstreams. */
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bool tlvstream_get_short_channel_id(struct tlv_field *stream, u64 type,
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struct short_channel_id *value);
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bool tlvstream_get_tu64(struct tlv_field *stream, u64 type, u64 *value);
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bool tlvstream_get_tu32(struct tlv_field *stream, u64 type, u32 *value);
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#endif /* LIGHTNING_WIRE_TLVSTREAM_H */
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