szaszm commented on a change in pull request #923:
URL: https://github.com/apache/nifi-minifi-cpp/pull/923#discussion_r503320203
##########
File path: libminifi/src/utils/Id.cpp
##########
@@ -115,18 +116,36 @@ std::string Identifier::to_string() const {
utils::optional<Identifier> Identifier::parse(const std::string &str) {
Identifier id;
- int assigned = sscanf(str.c_str(), UUID_FORMAT_STRING,
- &id.data_[0], &id.data_[1], &id.data_[2], &id.data_[3],
- &id.data_[4], &id.data_[5],
- &id.data_[6], &id.data_[7],
- &id.data_[8], &id.data_[9],
- &id.data_[10], &id.data_[11], &id.data_[12], &id.data_[13],
&id.data_[14], &id.data_[15]);
- if (assigned != 16) {
- return utils::nullopt;
+ if (str.length() != 36) return {};
+ int charIdx = 0;
+ int byteIdx = 0;
+ auto input = reinterpret_cast<const uint8_t*>(str.c_str());
+ while(byteIdx < 4) {
+ if (!parseByte(id.data_, input, charIdx, byteIdx)) return {};
+ }
+ if (input[charIdx++] != '-') return {};
+
+ for (size_t idx = 0; idx < 3; ++idx) {
+ if (!parseByte(id.data_, input, charIdx, byteIdx)) return {};
+ if (!parseByte(id.data_, input, charIdx, byteIdx)) return {};
+ if (input[charIdx++] != '-') return {};
+ }
+ while(byteIdx < 16) {
+ if(!parseByte(id.data_, input, charIdx, byteIdx)) return {};
Review comment:
I would add a few comments to explain what each part is parsing, because
it's inherently less readable than a format string.
```suggestion
// xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx is 36 long: 16 bytes * 2 hex
digits / byte + 4 hyphens
if (str.length() != 36) return {};
int charIdx = 0;
int byteIdx = 0;
auto input = reinterpret_cast<const uint8_t*>(str.c_str());
// [xxxxxxxx]-xxxx-xxxx-xxxx-xxxxxxxxxxxx
while(byteIdx < 4) {
if (!parseByte(id.data_, input, charIdx, byteIdx)) return {};
}
// xxxxxxxx[-]xxxx-xxxx-xxxx-xxxxxxxxxxxx
if (input[charIdx++] != '-') return {};
// xxxxxxxx-[xxxx-xxxx-xxxx-]xxxxxxxxxxxx - 3x 2 bytes and a hyphen
for (size_t idx = 0; idx < 3; ++idx) {
if (!parseByte(id.data_, input, charIdx, byteIdx)) return {};
if (!parseByte(id.data_, input, charIdx, byteIdx)) return {};
if (input[charIdx++] != '-') return {};
}
// xxxxxxxx-xxxx-xxxx-xxxx-[xxxxxxxxxxxx] - the rest, i.e. until byte 16
while(byteIdx < 16) {
if(!parseByte(id.data_, input, charIdx, byteIdx)) return {};
```
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