Function FillPgbsonElementUnsafe

pg_documentdb_core/src/io/pgbsonelement.c:327–373

static bool
FillPgbsonElementUnsafe(uint8_t *data, uint32_t data_len, pgbsonelement *element)
{
#if BSON_BYTE_ORDER == BSON_BIG_ENDIAN
	bson_iter_t iterator;

	if (!bson_iter_init_from_data(&iterator,
								  data,
								  data_len))
	{
		ereport(ERROR, (errcode(ERRCODE_DOCUMENTDB_BADVALUE),
						errmsg("Could not initialize bson iterator.")));
	}

	if (!bson_iter_next(&iterator))
	{
		ereport(ERROR, errmsg("invalid input BSON: Should not be empty document"));
	}

	BsonIterToPgbsonElement(&iterator, element);
	return true;
#else
	uint32_t minLength = 5;
	uint32_t typeOffset = 4;
	Assert(data != NULL);

	if (data_len < minLength)
	{
		ereport(ERROR, errmsg("invalid input BSON: Should not be empty document"));
	}

	/* First 4 bytes are the length */
	uint32_t length;
	memcpy(&length, data, sizeof(uint32_t));

	/* Fifth byte is the value */
	element->bsonValue.value_type = (bson_type_t) data[typeOffset];

	/* Then the path that is null terminated */
	element->path = (char *) &data[minLength];
	element->pathLength = strlen(element->path);
	data += element->pathLength + minLength + 1;

	int lengthLeft = length - element->pathLength - minLength;
	return FillBsonElementValueAndPathUnsafe(element, data, lengthLeft);
#endif
}


#if BSON_BYTE_ORDER != BSON_BIG_ENDIAN