[apps\shared] Create a folder shared/

Change-Id: I94e4474ff5ab3bf9db7afd5b3be57b985755ecdf

apps/shared/float_pair_store.cpp

@@ -0,0 +1,67 @@
+#include "float_pair_store.h"
+#include <math.h>
+#include <assert.h>
+#include <stddef.h>
+#include <ion.h>
+
+FloatPairStore::FloatPairStore() :
+  m_numberOfPairs(0)
+{
+}
+
+float FloatPairStore::get(int i, int j) {
+  assert(j < m_numberOfPairs);
+  return m_data[i][j];
+}
+
+void FloatPairStore::set(float f, int i, int j) {
+  if (j >= k_maxNumberOfPairs) {
+    return;
+  }
+  m_data[i][j] = f;
+  if (j >= m_numberOfPairs) {
+    int otherI = i == 0 ? 1 : 0;
+    m_data[otherI][j] = defaultValue(otherI);
+    m_numberOfPairs++;
+  }
+}
+
+int FloatPairStore::numberOfPairs() {
+  return m_numberOfPairs;
+}
+
+void FloatPairStore::deletePairAtIndex(int i) {
+  m_numberOfPairs--;
+  for (int k = i; k < m_numberOfPairs; k++) {
+    m_data[0][k] = m_data[0][k+1];
+    m_data[1][k] = m_data[1][k+1];
+  }
+}
+
+void FloatPairStore::deleteAllPairs() {
+  m_numberOfPairs = 0;
+}
+
+void FloatPairStore::resetColumn(int i) {
+  for (int k = 0; k < m_numberOfPairs; k++) {
+    m_data[i][k] = defaultValue(i);
+  }
+}
+
+float FloatPairStore::sumOfColumn(int i) {
+  float result = 0;
+  for (int k = 0; k < m_numberOfPairs; k++) {
+    result += m_data[i][k];
+  }
+  return result;
+}
+
+uint32_t FloatPairStore::storeChecksum() {
+  size_t dataLengthInBytes = m_numberOfPairs*2*sizeof(float);
+  assert((dataLengthInBytes & 0x3) == 0); // Assert that dataLengthInBytes is a multiple of 4
+  return Ion::crc32((uint32_t *)m_data, dataLengthInBytes>>2);
+}
+
+float FloatPairStore::defaultValue(int i) {
+  return 0.0f;
+}