Move C/C++ sources to src subdirectory

2021-02-25 23:59:03 +03:00
parent 08aed962de
commit bf9a175efc
87 changed files with 194 additions and 189 deletions
@@ -0,0 +1,55 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 (see README.md for details)
+
+#include "base64.h"
+
+std::string base64_encode(const std::string &in)
+{
+    std::string out;
+    unsigned val = 0;
+    int valb = -6;
+    for (unsigned char c: in)
+    {
+        val = (val << 8) + c;
+        valb += 8;
+        while (valb >= 0)
+        {
+            out.push_back("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[(val>>valb) & 0x3F]);
+            valb -= 6;
+        }
+    }
+    if (valb > -6)
+        out.push_back("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[((val<<8)>>(valb+8)) & 0x3F]);
+    while (out.size() % 4)
+        out.push_back('=');
+    return out;
+}
+
+static char T[256] = { 0 };
+
+std::string base64_decode(const std::string &in)
+{
+    std::string out;
+    if (T[0] == 0)
+    {
+        for (int i = 0; i < 256; i++)
+            T[i] = -1;
+        for (int i = 0; i < 64; i++)
+            T[(unsigned char)("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[i])] = i;
+    }
+    unsigned val = 0;
+    int valb = -8;
+    for (unsigned char c: in)
+    {
+        if (T[c] == -1)
+            break;
+        val = (val<<6) + T[c];
+        valb += 6;
+        if (valb >= 0)
+        {
+            out.push_back(char((val >> valb) & 0xFF));
+            valb -= 8;
+        }
+    }
+    return out;
+}