Function bitcoin_block_from_hex

bitcoin/block.c:138–223

Encoding is ... */

/* Encoding is <blockhdr> <varint-num-txs> <tx>... */
struct bitcoin_block *
bitcoin_block_from_hex(const tal_t *ctx, const struct chainparams *chainparams,
		       const char *hex, size_t hexlen)
{
	struct bitcoin_block *b;
	u8 *linear_tx;
	const u8 *p;
	size_t len, i, num, templen;
	struct sha256_ctx shactx;
	bool is_dynafed;
	u32 height;

	if (hexlen && hex[hexlen-1] == '\n')
		hexlen--;

	/* Set up the block for success. */
	b = tal(ctx, struct bitcoin_block);

	/* De-hex the array. */
	len = hex_data_size(hexlen);
	p = linear_tx = tal_arr(ctx, u8, len);
	if (!hex_decode(hex, hexlen, linear_tx, len))
		return tal_free(b);

	sha256_init(&shactx);

	b->hdr.version = pull_le32(&p, &len);
	sha256_le32(&shactx, b->hdr.version);

	pull(&p, &len, &b->hdr.prev_hash, sizeof(b->hdr.prev_hash));
	sha256_update(&shactx, &b->hdr.prev_hash, sizeof(b->hdr.prev_hash));

	pull(&p, &len, &b->hdr.merkle_hash, sizeof(b->hdr.merkle_hash));
	sha256_update(&shactx, &b->hdr.merkle_hash, sizeof(b->hdr.merkle_hash));

	b->hdr.timestamp = pull_le32(&p, &len);
	sha256_le32(&shactx, b->hdr.timestamp);

	if (is_elements(chainparams)) {
		/* A dynafed block is signalled by setting the MSB of the version. */
		is_dynafed = (b->hdr.version >> 31 == 1);

		/* elements_header.height */
		height = pull_le32(&p, &len);
		sha256_le32(&shactx, height);

		if (is_dynafed) {
			bitcoin_block_pull_dynafed_details(&p, &len, &shactx);
		} else {
			/* elemens_header.challenge */
			templen = pull_varint(&p, &len);
			sha256_varint(&shactx, templen);
			sha256_update(&shactx, p, templen);
			pull(&p, &len, NULL, templen);

			/* elements_header.solution. Not hashed since it'd be
			 * a circular dependency. */
			templen = pull_varint(&p, &len);