Base64 encoding/decoding added

src/Base64.cpp

@@ -0,0 +1,115 @@
+/*
+    Copyright 1991-2016 Amebis
+    Copyright 2016 G<>ANT
+
+    This file is part of WinStd.
+
+    Setup is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Setup is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with Setup. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "StdAfx.h"
+
+
+//////////////////////////////////////////////////////////////////////
+// winstd::base64_enc
+//////////////////////////////////////////////////////////////////////
+
+const char winstd::base64_enc::lookup[64] = {
+    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
+    'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
+    'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
+    'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
+};
+
+
+void winstd::base64_enc::encode(_Out_ std::string &out, _In_bytecount_(size) const void *data, _In_ size_t size, _In_opt_ bool is_last)
+{
+    assert(data || !size);
+
+    size_t i = 0, j = 0;
+
+    // Convert data character by character.
+    for (;;) {
+        if (num >= 3) {
+            encode(out, buf);
+            num = 0;
+            j += 4;
+        }
+
+        if (i >= size)
+            break;
+
+        buf[num++] = ((unsigned char*)data)[i++];
+    }
+
+    // If this is the last block, flush the buffer.
+    if (is_last && num) {
+        encode(out, buf, num);
+        num = 0;
+        j += 4;
+    }
+}
+
+
+//////////////////////////////////////////////////////////////////////
+// winstd::base64_dec
+//////////////////////////////////////////////////////////////////////
+
+const unsigned char winstd::base64_dec::lookup[256] = {
+/*           0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F  */
+/* 0 */    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+/* 1 */    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+/* 2 */    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,  62, 255, 255, 255,  63,
+/* 3 */     52,  53,  54,  55,  56,  57,  58,  59,  60,  61, 255, 255, 255,  64, 255, 255,
+/* 4 */    255,   0,   1,   2,   3,   4,   5,   6,   7,   8,   9,  10,  11,  12,  13,  14,
+/* 5 */     15,  16,  17,  18,  19,  20,  21,  22,  23,  24,  25, 255, 255, 255, 255, 255,
+/* 6 */    255,  26,  27,  28,  29,  30,  31,  32,  33,  34,  35,  36,  37,  38,  39,  40,
+/* 7 */     41,  42,  43,  44,  45,  46,  47,  48,  49,  50,  51, 255, 255, 255, 255, 255,
+/* 8 */    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+/* 9 */    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+/* A */    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+/* B */    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+/* C */    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+/* D */    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+/* E */    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+/* F */    255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255
+};
+
+
+void winstd::base64_dec::decode(_Out_ std::vector<unsigned char> &out, _Out_ bool &is_last, _In_z_count_(size) const char *data, _In_ size_t size)
+{
+    size_t i = 0, j = 0;
+    size_t nibbles;
+
+    is_last = false;
+
+    for (;;) {
+        if (num >= 4) {
+            // Buffer full; decode it.
+            nibbles = decode(out, buf);
+            j += nibbles;
+            num = 0;
+            if (nibbles < 3) {
+                is_last = true;
+                break;
+            }
+        }
+
+        if (i >= size || !data[i])
+            break;
+
+        if ((buf[num] = lookup[(unsigned char)data[i++]]) != 255)
+            num++;
+    }
+}

src/StdAfx.h

@@ -20,6 +20,7 @@
 
 #pragma once
 
+#include "../include/WinStd/Base64.h"
 #include "../include/WinStd/Crypt.h"
 #include "../include/WinStd/EAP.h"
 #include "../include/WinStd/Common.h"