1 files changed, 101 insertions, 0 deletions
diff --git a/src/mir_core/http.cpp b/src/mir_core/http.cpp
index da01fe11d8..03c6f9b91f 100644
--- a/src/mir_core/http.cpp
+++ b/src/mir_core/http.cpp
@@ -56,3 +56,104 @@ MIR_CORE_DLL(char*) mir_urlEncode(const char *szUrl)
 	*d = '\0';
 	return szOutput;
 }
+
+/////////////////////////////////////////////////////////////////////////////////////////
+
+static char cb64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+MIR_CORE_DLL(char*) mir_base64_encode(const BYTE *input, unsigned inputLen)
+{
+	if (input == NULL)
+		return NULL;
+
+	BYTE chr[3];
+
+	size_t length = inputLen;
+	size_t nLength = 4 * ((length + 2) / 3) + 1;
+
+	char *output = (char *)mir_alloc(nLength);
+	char *p = output;
+
+	for (size_t i=0; i < length; )
+	{
+		chr[0] = input[i++];
+		chr[1] = input[i++];
+		chr[2] = input[i++];
+
+		*p++ = cb64[ chr[0] >> 2 ];
+		*p++ = cb64[ ((chr[0] & 0x03) << 4) | (chr[1] >> 4) ];
+		BYTE b2 = ((chr[1] & 0x0F) << 2) | (chr[2] >> 6),
+		     b3 = chr[2] & 0x3F;
+
+		if (i - 2 >= length) { *p++ = '='; *p++ = '='; }
+		else if (i - 1 >= length) { *p++ = cb64[b2]; *p++ = '='; }
+		else { *p++ = cb64[b2]; *p++ = cb64[b3]; }
+	}
+
+	*p = 0;
+
+	return output;
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////
+
+static int Base64DecodeTable[] =
+{
+	-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+	-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+	-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
+	52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1,
+	-1, 0, 1, 2,  3, 4, 5, 6,  7, 8, 9,10, 11,12,13,14,
+	15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1,
+	-1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
+	41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1,
+	-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+	-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+	-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+	-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+	-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+	-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+	-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+	-1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1
+};
+
+MIR_CORE_DLL(void*) mir_base64_decode(const char *input, unsigned *outputLen)
+{
+	if (input == NULL)
+		return NULL;
+
+	size_t i = 0;
+	BYTE chr[3], enc[4];
+
+	size_t length = strlen(input);
+	size_t nLength = (length / 4) * 3;
+
+	char *output = (char *)mir_alloc(nLength+1);
+	char *p = output;
+
+	while (i < length)
+	{
+		enc[0] = Base64DecodeTable[input[i++]];
+		enc[1] = Base64DecodeTable[input[i++]];
+		enc[2] = Base64DecodeTable[input[i++]];
+		enc[3] = Base64DecodeTable[input[i++]];
+
+		if (enc[0] == -1 || enc[1] == -1) break;
+
+		chr[0] = (enc[0] << 2) | (enc[1] >> 4);
+		chr[1] = ((enc[1] & 15) << 4) | (enc[2] >> 2);
+		chr[2] = ((enc[2] & 3) << 6) | enc[3];
+
+		*p++ = chr[0];
+
+		if (enc[2] != -1) *p++ = chr[1];
+		if (enc[3] != -1) *p++ = chr[2];
+	}
+
+	*p = 0;
+
+	if (outputLen != NULL)
+		*outputLen = (unsigned)nLength;
+
+	return output;
+}