aboutsummaryrefslogtreecommitdiffstats
path: root/libdevcore/Base64.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'libdevcore/Base64.cpp')
-rw-r--r--libdevcore/Base64.cpp146
1 files changed, 146 insertions, 0 deletions
diff --git a/libdevcore/Base64.cpp b/libdevcore/Base64.cpp
new file mode 100644
index 00000000..8ee2b29f
--- /dev/null
+++ b/libdevcore/Base64.cpp
@@ -0,0 +1,146 @@
+/*
+ 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
+*/
+/// Adapted from code found on http://stackoverflow.com/questions/180947/base64-decode-snippet-in-c
+/// Originally by René Nyffenegger, modified by some other guy and then devified by Gav Wood.
+
+#include "Base64.h"
+
+using namespace std;
+using namespace dev;
+
+static inline bool is_base64(byte c)
+{
+ return (isalnum(c) || (c == '+') || (c == '/'));
+}
+
+static inline byte find_base64_char_index(byte c)
+{
+ if ('A' <= c && c <= 'Z') return c - 'A';
+ else if ('a' <= c && c <= 'z') return c - 'a' + 1 + find_base64_char_index('Z');
+ else if ('0' <= c && c <= '9') return c - '0' + 1 + find_base64_char_index('z');
+ else if (c == '+') return 1 + find_base64_char_index('9');
+ else if (c == '/') return 1 + find_base64_char_index('+');
+ else return 1 + find_base64_char_index('/');
+}
+
+string dev::toBase64(bytesConstRef _in)
+{
+ static const char base64_chars[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "abcdefghijklmnopqrstuvwxyz"
+ "0123456789+/";
+
+ string ret;
+ int i = 0;
+ int j = 0;
+ byte char_array_3[3];
+ byte char_array_4[4];
+
+ auto buf = _in.data();
+ auto bufLen = _in.size();
+
+ while (bufLen--)
+ {
+ char_array_3[i++] = *(buf++);
+ 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;
+}
+
+bytes dev::fromBase64(string const& encoded_string)
+{
+ auto in_len = encoded_string.size();
+ int i = 0;
+ int j = 0;
+ int in_ = 0;
+ byte char_array_3[3];
+ byte char_array_4[4];
+ bytes ret;
+
+ while (in_len-- && encoded_string[in_] != '=' && is_base64(encoded_string[in_]))
+ {
+ char_array_4[i++] = encoded_string[in_]; in_++;
+ if (i == 4)
+ {
+ for (i = 0; i < 4; i++)
+ char_array_4[i] = find_base64_char_index(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] = find_base64_char_index(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[j]);
+ }
+
+ return ret;
+}