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authordanieldg <danieldg@e03df62e-2008-0410-955e-edbf42e46eb7>2010-02-21 17:08:45 +0000
committerdanieldg <danieldg@e03df62e-2008-0410-955e-edbf42e46eb7>2010-02-21 17:08:45 +0000
commitf91a61fa22b239384c31526fd11da1e3030aaa96 (patch)
tree1faad7b868d6485073f38e9c5104f16f1084bfe4 /src/inspstring.cpp
parent4b2784862e7879b22f694801a25c4b2bedb457f9 (diff)
Add Base64 encode/decode functions to the core
git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@12507 e03df62e-2008-0410-955e-edbf42e46eb7
Diffstat (limited to 'src/inspstring.cpp')
-rw-r--r--src/inspstring.cpp72
1 files changed, 72 insertions, 0 deletions
diff --git a/src/inspstring.cpp b/src/inspstring.cpp
index 816e37a19..74629bf55 100644
--- a/src/inspstring.cpp
+++ b/src/inspstring.cpp
@@ -152,3 +152,75 @@ std::string BinToHex(const std::string& data)
}
return rv;
}
+
+static const char b64table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+std::string BinToBase64(const std::string& data_str, const char* table, char pad)
+{
+ if (!table)
+ table = b64table;
+
+ uint32_t buffer;
+ uint8_t* data = (uint8_t*)data_str.data();
+ std::string rv;
+ size_t i = 0;
+ while (i + 2 < data_str.length())
+ {
+ buffer = (data[i] << 16 | data[i+1] << 8 | data[i+2]);
+ rv.push_back(table[0x3F & (buffer >> 18)]);
+ rv.push_back(table[0x3F & (buffer >> 12)]);
+ rv.push_back(table[0x3F & (buffer >> 6)]);
+ rv.push_back(table[0x3F & (buffer >> 0)]);
+ i += 3;
+ }
+ if (data_str.length() == i)
+ {
+ // no extra characters
+ }
+ else if (data_str.length() == i + 1)
+ {
+ buffer = data[i] << 16;
+ rv.push_back(table[0x3F & (buffer >> 18)]);
+ rv.push_back(table[0x3F & (buffer >> 12)]);
+ if (pad)
+ {
+ rv.push_back(pad);
+ rv.push_back(pad);
+ }
+ }
+ else if (data_str.length() == i + 2)
+ {
+ buffer = (data[i] << 16 | data[i] << 8);
+ rv.push_back(table[0x3F & (buffer >> 18)]);
+ rv.push_back(table[0x3F & (buffer >> 12)]);
+ rv.push_back(table[0x3F & (buffer >> 6)]);
+ if (pad)
+ rv.push_back(pad);
+ }
+ return rv;
+}
+
+std::string Base64ToBin(const std::string& data_str, const char* table)
+{
+ if (!table)
+ table = b64table;
+
+ bool ok = true;
+ int bitcount = 0;
+ uint32_t buffer;
+ const char* data = data_str.c_str();
+ std::string rv;
+ while (ok)
+ {
+ const char* find = strchr(table, *data);
+ ok = (find && find < table + 64);
+ buffer = (buffer << 6) | (ok ? find - table : 0);
+ bitcount += 6;
+ if (bitcount >= 8)
+ {
+ bitcount -= 8;
+ rv.push_back((buffer >> bitcount) & 0xFF);
+ }
+ }
+ return rv;
+}