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92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
#include <bitcoin/short_channel_id.h>
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#include <ccan/tal/str/str.h>
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#include <common/type_to_string.h>
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#include <stdio.h>
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#include <string.h>
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/* BOLT#07:
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*
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* The `short_channel_id` is the unique description of the funding
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* transaction. It is constructed as follows:
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* 1. the most significant 3 bytes: indicating the block height
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* 2. the next 3 bytes: indicating the transaction index within the block
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* 3. the least significant 2 bytes: indicating the output index that pays to the channel.
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*
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* The standard human readable format for `short_channel_id` is created
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* by printing the above components, in the order: block height,
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* transaction index, and output index. Each component is printed as a
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* decimal number, and separated from each other by the small letter
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* `x`. For example, a `short_channel_id` might be written as
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* `539268x845x1`, indicating a channel on the output 1 of the
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* transaction at index 845 of the block at height 539268.
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*/
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bool mk_short_channel_id(struct short_channel_id *scid,
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u64 blocknum, u64 txnum, u64 outnum)
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{
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if ((blocknum & 0xFFFFFF) != blocknum
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|| (txnum & 0xFFFFFF) != txnum
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|| (outnum & 0xFFFF) != outnum)
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return false;
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scid->u64 = (((u64)blocknum & 0xFFFFFF) << 40 |
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((u64)txnum & 0xFFFFFF) << 16 |
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(outnum & 0xFFFF));
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return true;
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}
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bool short_channel_id_from_str(const char *str, size_t strlen,
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struct short_channel_id *dst)
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{
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u32 blocknum, txnum;
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u16 outnum;
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int matches;
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char buf[strlen + 1];
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memcpy(buf, str, strlen);
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buf[strlen] = 0;
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matches = sscanf(buf, "%ux%ux%hu", &blocknum, &txnum, &outnum);
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return matches == 3
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&& mk_short_channel_id(dst, blocknum, txnum, outnum);
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}
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char *short_channel_id_to_str(const tal_t *ctx, const struct short_channel_id *scid)
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{
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return tal_fmt(ctx, "%dx%dx%d",
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short_channel_id_blocknum(scid),
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short_channel_id_txnum(scid),
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short_channel_id_outnum(scid));
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}
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bool short_channel_id_dir_from_str(const char *str, size_t strlen,
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struct short_channel_id_dir *scidd)
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{
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const char *slash = memchr(str, '/', strlen);
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if (!slash || slash + 2 != str + strlen)
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return false;
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if (!short_channel_id_from_str(str, slash - str, &scidd->scid))
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return false;
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if (slash[1] == '0')
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scidd->dir = 0;
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else if (slash[1] == '1')
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scidd->dir = 1;
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else
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return false;
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return true;
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}
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char *short_channel_id_dir_to_str(const tal_t *ctx,
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const struct short_channel_id_dir *scidd)
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{
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char *str, *scidstr = short_channel_id_to_str(NULL, &scidd->scid);
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str = tal_fmt(ctx, "%s/%u", scidstr, scidd->dir);
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tal_free(scidstr);
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return str;
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}
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REGISTER_TYPE_TO_STRING(short_channel_id, short_channel_id_to_str);
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REGISTER_TYPE_TO_STRING(short_channel_id_dir, short_channel_id_dir_to_str);
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