From 40451e762cb909012161e2f075a3de6f720efcb5 Mon Sep 17 00:00:00 2001
From: Sebastian Messmer <mail@smessmer.de>
Date: Sat, 25 Apr 2015 13:20:26 +0200
Subject: [PATCH] Started replacing DataBlockFixture with DataFixture. Step 1:
 Create DataFixture

---
 data/DataFixture.cpp | 23 +++++++++++++++++++++++
 data/DataFixture.h   | 16 ++++++++++++++++
 2 files changed, 39 insertions(+)
 create mode 100644 data/DataFixture.cpp
 create mode 100644 data/DataFixture.h

diff --git a/data/DataFixture.cpp b/data/DataFixture.cpp
new file mode 100644
index 00000000..b9918846
--- /dev/null
+++ b/data/DataFixture.cpp
@@ -0,0 +1,23 @@
+#include "DataFixture.h"
+
+namespace cpputils {
+  Data DataFixture::generate(size_t size, long long int seed) {
+    Data result(size);
+    long long int val = seed;
+    for(size_t i=0; i<size/sizeof(long long int); ++i) {
+      //MMIX linear congruential generator
+      val *= 6364136223846793005L;
+      val += 1442695040888963407;
+      reinterpret_cast<long long int*>(result.data())[i] = val;
+    }
+    uint64_t alreadyWritten = (size/sizeof(long long int))*sizeof(long long int);
+    val *= 6364136223846793005L;
+    val += 1442695040888963407;
+    char *remainingBytes = reinterpret_cast<char*>(&val);
+    //Fill remaining bytes
+    for(size_t i=0; i<size-alreadyWritten; ++i) {
+      reinterpret_cast<char*>(result.data())[alreadyWritten + i] = remainingBytes[i];
+    }
+    return result;
+  }
+}
diff --git a/data/DataFixture.h b/data/DataFixture.h
new file mode 100644
index 00000000..bab9bbc6
--- /dev/null
+++ b/data/DataFixture.h
@@ -0,0 +1,16 @@
+#pragma once
+#ifndef MESSMER_CPP_UTILS_DATA_DATAFIXTURE_H_
+#define MESSMER_CPP_UTILS_DATA_DATAFIXTURE_H_
+
+#include "Data.h"
+
+namespace cpputils {
+
+class DataFixture {
+public:
+  static Data generate(size_t size, long long int seed = 1);
+};
+
+}
+
+#endif