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Diffstat (limited to 'Swiften/StringCodecs/Hexify.cpp')
-rw-r--r--Swiften/StringCodecs/Hexify.cpp18
1 files changed, 18 insertions, 0 deletions
diff --git a/Swiften/StringCodecs/Hexify.cpp b/Swiften/StringCodecs/Hexify.cpp
index 367743c..668079b 100644
--- a/Swiften/StringCodecs/Hexify.cpp
+++ b/Swiften/StringCodecs/Hexify.cpp
@@ -31,4 +31,22 @@ std::string Hexify::hexify(const ByteArray& data) {
return std::string(result.str());
}
+ByteArray Hexify::unhexify(const std::string& hexstring) {
+ if (hexstring.size() % 2) {
+ return ByteArray();
+ }
+ ByteArray result = ByteArray(hexstring.size() / 2);
+ for (size_t pos = 0; pos < hexstring.size() - 1; pos += 2) {
+ char c;
+ c = hexstring[pos];
+ int a = (c>='0'&&c<='9') ? c-'0' : (c>='A'&&c<='Z') ? c-'A' + 10 : (c>='a'&&c<='z') ? c-'a' + 10 : -1;
+ c = hexstring[pos+1];
+ int b = (c>='0'&&c<='9') ? c-'0' : (c>='A'&&c<='Z') ? c-'A' + 10 : (c>='a'&&c<='z') ? c-'a' + 10 : -1;
+ if (a == -1 || b == -1) return ByteArray(); // fail
+ result[pos/2] = (a<<4) | b;
+
+ }
+ return result;
+}
+
}