diff options
Diffstat (limited to 'Swiften/StringCodecs/Hexify.cpp')
-rw-r--r-- | Swiften/StringCodecs/Hexify.cpp | 18 |
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; +} + } |