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-rw-r--r--source/StringUtils.cpp68
1 files changed, 68 insertions, 0 deletions
diff --git a/source/StringUtils.cpp b/source/StringUtils.cpp
index c62bb3acb..530eda086 100644
--- a/source/StringUtils.cpp
+++ b/source/StringUtils.cpp
@@ -745,3 +745,71 @@ AString ReplaceAllCharOccurrences(const AString & a_String, char a_From, char a_
+
+/// Converts one Hex character in a Base64 encoding into the data value
+static inline int UnBase64(char c)
+{
+ if (c >='A' && c <= 'Z')
+ {
+ return c - 'A';
+ }
+ if (c >='a' && c <= 'z')
+ {
+ return c - 'a' + 26;
+ }
+ if (c >= '0' && c <= '9')
+ {
+ return c - '0' + 52;
+ }
+ if (c == '+')
+ {
+ return 62;
+ }
+ if (c == '/')
+ {
+ return 63;
+ }
+ if (c == '=')
+ {
+ return -1;
+ }
+ return -2;
+}
+
+
+
+
+
+AString Base64Decode(const AString & a_Base64String)
+{
+ AString res;
+ size_t i, len = a_Base64String.size();
+ int o, c;
+ res.resize((len * 4) / 3 + 5, 0); // Approximate the upper bound on the result length
+ for (o = 0, i = 0; i < len; i++)
+ {
+ c = UnBase64(a_Base64String[i]);
+ if (c >= 0)
+ {
+ switch (o & 7)
+ {
+ case 0: res[o >> 3] |= (c << 2); break;
+ case 6: res[o >> 3] |= (c >> 4); res[(o >> 3) + 1] |= (c << 4); break;
+ case 4: res[o >> 3] |= (c >> 2); res[(o >> 3) + 1] |= (c << 6); break;
+ case 2: res[o >> 3] |= c; break;
+ }
+ o += 6;
+ }
+ if (c == -1)
+ {
+ // Error while decoding, invalid input. Return as much as we've decoded:
+ res.resize(o >> 3);
+ return ERROR_SUCCESS;
+ }
+ }
+ res.resize(o >> 3);
+ return res;}
+
+
+
+