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Move individual KeyOriginInfo de/ser to separate function

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To make it easier to de/serialize individual KeyOriginInfo for PSBTs,
separate the actual de/serialization of KeyOriginInfo to its own
function.

This is an additional separation where any length prefix is processed by
the caller.
This commit is contained in:
Andrew Chow 2021-07-12 15:31:12 -04:00
parent 2111f32f2a
commit ce911204e4
1 changed files with 23 additions and 8 deletions
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31
src/psbt.h
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@ -97,22 +97,30 @@ void UnserializeFromVector(Stream& s, X&... args)
}
}
// Deserialize an individual HD keypath to a stream
// Deserialize bytes of given length from the stream as a KeyOriginInfo
template<typename Stream>
void DeserializeHDKeypath(Stream& s, KeyOriginInfo& hd_keypath)
KeyOriginInfo DeserializeKeyOrigin(Stream& s, uint64_t length)
{
// Read in key path
uint64_t value_len = ReadCompactSize(s);
if (value_len % 4 || value_len == 0) {
if (length % 4 || length == 0) {
throw std::ios_base::failure("Invalid length for HD key path");
}
KeyOriginInfo hd_keypath;
s >> hd_keypath.fingerprint;
for (unsigned int i = 4; i < value_len; i += sizeof(uint32_t)) {
for (unsigned int i = 4; i < length; i += sizeof(uint32_t)) {
uint32_t index;
s >> index;
hd_keypath.path.push_back(index);
}
return hd_keypath;
}
// Deserialize a length prefixed KeyOriginInfo from a stream
template<typename Stream>
void DeserializeHDKeypath(Stream& s, KeyOriginInfo& hd_keypath)
{
hd_keypath = DeserializeKeyOrigin(s, ReadCompactSize(s));
}
// Deserialize HD keypaths into a map
@ -139,17 +147,24 @@ void DeserializeHDKeypaths(Stream& s, const std::vector<unsigned char>& key, std
hd_keypaths.emplace(pubkey, std::move(keypath));
}
// Serialize an individual HD keypath to a stream
// Serialize a KeyOriginInfo to a stream
template<typename Stream>
void SerializeHDKeypath(Stream& s, KeyOriginInfo hd_keypath)
void SerializeKeyOrigin(Stream& s, KeyOriginInfo hd_keypath)
{
WriteCompactSize(s, (hd_keypath.path.size() + 1) * sizeof(uint32_t));
s << hd_keypath.fingerprint;
for (const auto& path : hd_keypath.path) {
s << path;
}
}
// Serialize a length prefixed KeyOriginInfo to a stream
template<typename Stream>
void SerializeHDKeypath(Stream& s, KeyOriginInfo hd_keypath)
{
WriteCompactSize(s, (hd_keypath.path.size() + 1) * sizeof(uint32_t));
SerializeKeyOrigin(s, hd_keypath);
}
// Serialize HD keypaths to a stream from a map
template<typename Stream>
void SerializeHDKeypaths(Stream& s, const std::map<CPubKey, KeyOriginInfo>& hd_keypaths, CompactSizeWriter type)