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util: make EncodeBase58 consume Spans

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This commit is contained in:
Sebastian Falbesoner
2020-08-10 02:52:37 +02:00
parent bd00d3b1f2
commit f0fce0675d
5 changed files with 13 additions and 23 deletions
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19
src/base58.cpp
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@@ -84,21 +84,21 @@ bool DecodeBase58(const char* psz, std::vector<unsigned char>& vch, int max_ret_
return true;
}
std::string EncodeBase58(const unsigned char* pbegin, const unsigned char* pend)
std::string EncodeBase58(Span<const unsigned char> input)
{
// Skip & count leading zeroes.
int zeroes = 0;
int length = 0;
while (pbegin != pend && *pbegin == 0) {
pbegin++;
while (input.size() > 0 && input[0] == 0) {
input = input.subspan(1);
zeroes++;
}
// Allocate enough space in big-endian base58 representation.
int size = (pend - pbegin) * 138 / 100 + 1; // log(256) / log(58), rounded up.
int size = input.size() * 138 / 100 + 1; // log(256) / log(58), rounded up.
std::vector<unsigned char> b58(size);
// Process the bytes.
while (pbegin != pend) {
int carry = *pbegin;
while (input.size() > 0) {
int carry = input[0];
int i = 0;
// Apply "b58 = b58 * 256 + ch".
for (std::vector<unsigned char>::reverse_iterator it = b58.rbegin(); (carry != 0 || i < length) && (it != b58.rend()); it++, i++) {
@@ -109,7 +109,7 @@ std::string EncodeBase58(const unsigned char* pbegin, const unsigned char* pend)
assert(carry == 0);
length = i;
pbegin++;
input = input.subspan(1);
}
// Skip leading zeroes in base58 result.
std::vector<unsigned char>::iterator it = b58.begin() + (size - length);
@@ -124,11 +124,6 @@ std::string EncodeBase58(const unsigned char* pbegin, const unsigned char* pend)
return str;
}
std::string EncodeBase58(const std::vector<unsigned char>& vch)
{
return EncodeBase58(vch.data(), vch.data() + vch.size());
}
bool DecodeBase58(const std::string& str, std::vector<unsigned char>& vchRet, int max_ret_len)
{
if (!ValidAsCString(str)) {