add base64 encode/decode to Utils::

include/pdal/Utils.hpp

@@ -46,6 +46,7 @@
 #include <limits>
 #include <cstring>
 #include <sstream>
+#include <vector>
 
 #include <boost/filesystem.hpp>
 #include <boost/algorithm/string/erase.hpp>
@@ -161,7 +162,9 @@ class PDAL_DLL Utils
     static std::string generate_tempfile();
 
     static void* getDLLSymbol( std::string const& library, std::string const& name);
-
+    static std::string base64_encode(std::vector<boost::uint8_t> const& bytes);
+    static std::vector<boost::uint8_t> base64_decode(std::string const& input);
+
 private:
     template<typename T>
     static inline char* as_buffer(T& data)

src/Utils.cpp

@@ -36,6 +36,7 @@
 
 #include <cassert>
 #include <cstdlib>
+#include <cctype>
 
 #ifdef PDAL_COMPILER_MSVC
 #  pragma warning(disable: 4127)  // conditional expression is constant
@@ -279,4 +280,143 @@ void* Utils::getDLLSymbol(std::string const& library, std::string const& name)
 }
 
 
+
+
+
+
+
+
+
+
+std::string Utils::base64_encode(std::vector<boost::uint8_t> const& bytes) 
+{
+
+    /* 
+        base64.cpp and base64.h
+
+        Copyright (C) 2004-2008 René Nyffenegger
+
+        This source code is provided 'as-is', without any express or implied
+        warranty. In no event will the author be held liable for any damages
+        arising from the use of this software.
+
+        Permission is granted to anyone to use this software for any purpose,
+        including commercial applications, and to alter it and redistribute it
+        freely, subject to the following restrictions:
+
+        1. The origin of this source code must not be misrepresented; you must not
+          claim that you wrote the original source code. If you use this source code
+          in a product, an acknowledgment in the product documentation would be
+          appreciated but is not required.
+
+        2. Altered source versions must be plainly marked as such, and must not be
+          misrepresented as being the original source code.
+
+        3. This notice may not be removed or altered from any source distribution.
+
+        René Nyffenegger rene.nyffenegger@adp-gmbh.ch
+
+    */
+
+    unsigned char const* bytes_to_encode = &bytes.front();
+
+    unsigned int in_len = bytes.size(); 
+
+    const std::string base64_chars = 
+                 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                 "abcdefghijklmnopqrstuvwxyz"
+                 "0123456789+/";    
+    std::string ret;
+    int i = 0;
+    int j = 0;
+    boost::uint8_t char_array_3[3];
+    boost::uint8_t char_array_4[4];
+
+    while (in_len--) {
+        char_array_3[i++] = *(bytes_to_encode++);
+        if (i == 3) {
+            char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
+            char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
+            char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
+            char_array_4[3] = char_array_3[2] & 0x3f;
+
+            for(i = 0; (i <4) ; i++)
+                ret += base64_chars[char_array_4[i]];
+                i = 0;
+            }
+    }
+
+    if (i)
+    {
+        for(j = i; j < 3; j++)
+            char_array_3[j] = '\0';
+
+        char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
+        char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
+        char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
+        char_array_4[3] = char_array_3[2] & 0x3f;
+
+        for (j = 0; (j < i + 1); j++)
+            ret += base64_chars[char_array_4[j]];
+
+        while((i++ < 3))
+            ret += '=';
+    }
+
+  return ret;
+
+}
+
+std::vector<boost::uint8_t> Utils::base64_decode(std::string const& encoded_string) 
+{
+    const std::string base64_chars = 
+                 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                 "abcdefghijklmnopqrstuvwxyz"
+                 "0123456789+/";
+
+  int in_len = encoded_string.size();
+  int i = 0;
+  int j = 0;
+  int in_ = 0;
+  unsigned char char_array_4[4], char_array_3[3];
+  std::vector<boost::uint8_t> ret;
+
+  while (in_len-- && 
+        ( encoded_string[in_] != '=') && 
+        (isalnum(encoded_string[in_]) || (encoded_string[in_] == '+') || (encoded_string[in_] == '/'))
+        )  
+  {
+    char_array_4[i++] = encoded_string[in_]; in_++;
+    if (i ==4) {
+      for (i = 0; i <4; i++)
+        char_array_4[i] = base64_chars.find(char_array_4[i]);
+
+      char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
+      char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
+      char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
+
+      for (i = 0; (i < 3); i++)
+        ret.push_back( char_array_3[i]);
+      i = 0;
+    }
+  }
+
+  if (i) {
+    for (j = i; j <4; j++)
+      char_array_4[j] = 0;
+
+    for (j = 0; j <4; j++)
+      char_array_4[j] = base64_chars.find(char_array_4[j]);
+
+    char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
+    char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
+    char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
+
+    for (j = 0; (j < i - 1); j++) ret.push_back( char_array_3[i]);
+  }
+
+  return ret;
+}
+
+
 } // namespace pdal

test/unit/UtilsTest.cpp

@@ -39,6 +39,8 @@
 
 #include <pdal/Range.hpp>
 
+#include <vector>
+
 using namespace pdal;
 
 BOOST_AUTO_TEST_SUITE(UtilsTest)
@@ -155,4 +157,26 @@ BOOST_AUTO_TEST_CASE(test_field_read_write)
 }
 
 
+BOOST_AUTO_TEST_CASE(test_base64)
+{
+    std::vector<boost::uint8_t> data;
+    for(int i=0;i<100;i++) data.push_back(i);
+
+    std::string encoded = Utils::base64_encode(data);
+    std::vector<boost::uint8_t> decoded = Utils::base64_decode(encoded);
+
+    boost::uint32_t size(0);
+    for (std::vector<boost::uint8_t>::size_type i = 0; i < decoded.size(); ++i)
+    {
+        size = size + decoded[i];
+    }
+
+    BOOST_CHECK_EQUAL(size, 4950u);
+
+
+    return;
+}
+
+
+
 BOOST_AUTO_TEST_SUITE_END()