From 5e3b2449340245febd68b79c148a5ca3fd95336a Mon Sep 17 00:00:00 2001
From: Alexander Lantsev <aunsane@gmail.com>
Date: Mon, 3 Jun 2013 20:43:25 +0000
Subject: - added base64 encode/decode services in Miranda? utils

git-svn-id: http://svn.miranda-ng.org/main/trunk@4875 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
---
 src/modules/utils/utils.cpp | 97 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)

(limited to 'src/modules')

diff --git a/src/modules/utils/utils.cpp b/src/modules/utils/utils.cpp
index 276b8b1e84..c6bd60a59b 100644
--- a/src/modules/utils/utils.cpp
+++ b/src/modules/utils/utils.cpp
@@ -470,6 +470,100 @@ static INT_PTR GenerateRandom(WPARAM wParam, LPARAM lParam)
 	return 0;
 }
 
+/////////////////////////////////////////////////////////////////////////////////////////
+
+static INT_PTR EncodeBase64(WPARAM wParam, LPARAM lParam)
+{
+	size_t i = 0;
+	char chr[3], enc[4];
+	static char cb64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+	const char *input = (const char *)lParam;
+	size_t length = strlen(input);
+	size_t nLength = 4 * ((length + 2) / 3) + 1;
+
+	char *output = (char *)mir_alloc(nLength);
+	char *p = output;
+ 
+	while (i < length)
+	{
+		chr[0] = input[i++];
+		chr[1] = input[i++];
+		chr[2] = input[i++];
+
+		enc[0] = chr[0] >> 2;
+		enc[1] = ((chr[0] & 0x03) << 4) | (chr[1] >> 4);
+		enc[2] = ((chr[1] & 0x0F) << 2) | (chr[2] >> 6);
+		enc[3] = chr[2] & 0x3F;
+ 
+		*p++ = cb64[enc[0]]; *p++ = cb64[enc[1]];
+
+		if (i - 2 >= length) { *p++ = '='; *p++ = '='; }
+		else if (i - 1 >= length) { *p++ = cb64[enc[2]]; *p++ = '='; }
+		else { *p++ = cb64[enc[2]]; *p++ = cb64[enc[3]]; }
+	}
+
+	*p = 0;
+
+	return (INT_PTR)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
+};
+
+static INT_PTR DecodeBase64(WPARAM wParam, LPARAM lParam)
+{
+	size_t i = 0;
+	char chr[3], enc[4];
+
+	const char *input = (const char *)lParam;
+	size_t length = strlen(input);
+	size_t nLength = (length / 4) * 3 + 1;
+
+	char *output = (char *)mir_alloc(nLength);
+	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;
+
+	return (INT_PTR)output;
+}
+
 /////////////////////////////////////////////////////////////////////////////////////////
 int LoadUtilsModule(void)
 {
@@ -485,6 +579,9 @@ int LoadUtilsModule(void)
 	CreateServiceFunction(MS_UTILS_GETRANDOM, GenerateRandom);
 	CreateServiceFunction(MS_SYSTEM_RESTART, RestartMiranda);
 
+	CreateServiceFunction(MS_UTILS_ENCODEBASE64, EncodeBase64);
+	CreateServiceFunction(MS_UTILS_DECODEBASE64, DecodeBase64);
+
 	InitOpenUrl();
 	InitWindowList();
 	InitHyperlink();
-- 
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