Function PgbsonInitFromHexadecimalString

pg_documentdb_core/src/io/pgbson.c:134–163

* Initializes a pgbson structure from a hexadecimal String. */

 * Initializes a pgbson structure from a hexadecimal String.
 */
pgbson *
PgbsonInitFromHexadecimalString(const char *hexadecimalString)
{
	uint32_t strLength = strlen(hexadecimalString);

	uint32_t hexStringLength = (strLength - BsonHexPrefixLength);
	if (hexStringLength <= 0 || (hexStringLength % 2 != 0))
	{
		ereport(ERROR, (errcode(ERRCODE_DOCUMENTDB_BADVALUE), errmsg(
							"Invalid Hex string for pgbson input")));
	}

	if (strncmp(hexadecimalString, BsonHexPrefix, BsonHexPrefixLength) != 0)
	{
		ereport(ERROR, (errcode(ERRCODE_DOCUMENTDB_BADVALUE),
						errmsg("Bson Hex string does not have valid prefix %s",
							   BsonHexPrefix)));
	}

	uint32_t binaryLength = hexStringLength / 2;

	int allocSize = binaryLength + VARHDRSZ;
	pgbson *pgbsonVal = (pgbson *) palloc(allocSize);

	uint64 actualBinarySize = hex_decode(&hexadecimalString[BsonHexPrefixLength],
										 hexStringLength, VARDATA(pgbsonVal));
	Assert(actualBinarySize == binaryLength);
	SET_VARSIZE(pgbsonVal, (uint32_t) actualBinarySize + VARHDRSZ);
	return pgbsonVal;
}


/*