utils.gno

 1package cometbls
 2
 3// maxChainIDLen bounds the source length. The original Solidity routine packs
 4// the identifier into a single EVM word, so it is never larger than 32 bytes.
 5const maxChainIDLen = 32
 6
 7// chainIdToString converts a byte identifier into a string by trimming the
 8// leading zero padding and returning the remaining bytes. It returns an error
 9// when the source is empty, longer than maxChainIDLen, or contains only zero
10// padding, since none of those yield a valid chain-id.
11func chainIdToString(source []byte) (string, error) {
12	if len(source) == 0 {
13		return "", errorWithDetails(ErrInvalidChainID, "empty source")
14	}
15
16	if len(source) > maxChainIDLen {
17		return "", errorWithDetails(ErrInvalidChainID, "source exceeds max length")
18	}
19
20	offset := 0
21	for offset < len(source) && source[offset] == 0 {
22		offset++
23	}
24
25	if offset == len(source) {
26		return "", errorWithDetails(ErrInvalidChainID, "source is all zero padding")
27	}
28
29	return string(source[offset:]), nil
30}