1 files changed, 90 insertions, 0 deletions
diff --git a/vmime-master/src/vmime/utility/random.cpp b/vmime-master/src/vmime/utility/random.cpp
new file mode 100644
index 0000000..055122b
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+++ b/vmime-master/src/vmime/utility/random.cpp
@@ -0,0 +1,90 @@
+//
+// VMime library (http://www.vmime.org)
+// Copyright (C) 2002 Vincent Richard <vincent@vmime.org>
+//
+// This program 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.
+//
+// This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+//
+// Linking this library statically or dynamically with other modules is making
+// a combined work based on this library.  Thus, the terms and conditions of
+// the GNU General Public License cover the whole combination.
+//
+
+#include "vmime/utility/random.hpp"
+#include "vmime/platform.hpp"
+
+#include <ctime>
+
+
+namespace vmime {
+namespace utility {
+
+
+static unsigned int getRandomSeed() {
+
+	unsigned int seed;
+
+	platform::getHandler()->generateRandomBytes(
+		reinterpret_cast <unsigned char*>(&seed), sizeof(seed)
+	);
+
+	return seed;
+}
+
+
+unsigned int random::getNext() {
+
+	static unsigned int next = getRandomSeed();
+
+	// Park and Miller's minimal standard generator:
+	// xn+1 = (a * xn + b) mod c
+	// xn+1 = (16807 * xn) mod (2^31 - 1)
+	next = static_cast<unsigned int>((16807 * next) % 2147483647ul);
+	return next;
+}
+
+
+unsigned int random::getTime() {
+
+	return static_cast <unsigned int>((platform::getHandler()->getUnixTime()));
+}
+
+
+unsigned int random::getProcess() {
+
+	return platform::getHandler()->getProcessId();
+}
+
+
+const string random::getString(const size_t length, const string& randomChars) {
+
+	string res;
+	res.resize(length);
+
+	const unsigned int x = static_cast <unsigned int>(randomChars.length());
+	size_t c = 0;
+
+	while (c < length) {
+
+		for (unsigned int n = random::getNext() ; n != 0 && c < length ; n /= x) {
+			res[c++] = randomChars[n % x];
+		}
+	}
+
+	return res;
+}
+
+
+} // utility
+} // vmime