--- /dev/null
+#ifndef INTOVERFLOW_H
+#define INTOVERFLOW_H
+
+// simple safe library to handle integer overflows when doing buffer size calculations
+// Usage:
+// - calculate data size using INTOVERFLOW_??? macros
+// - compare: calculated-size <= INTOVERFLOW_NORMALIZE(buffersize)
+// Functionality:
+// - all overflows (values > INTOVERFLOW_MAX) and errors are mapped to INTOVERFLOW_MAX
+// - if any input of an operation is INTOVERFLOW_MAX, INTOVERFLOW_MAX will be returned
+// - otherwise, regular arithmetics apply
+
+#define INTOVERFLOW_MAX 2147483647
+
+#define INTOVERFLOW_ADD(a,b) (((a) < INTOVERFLOW_MAX && (b) < INTOVERFLOW_MAX && (a) < INTOVERFLOW_MAX - (b)) ? ((a) + (b)) : INTOVERFLOW_MAX)
+#define INTOVERFLOW_SUB(a,b) (((a) < INTOVERFLOW_MAX && (b) < INTOVERFLOW_MAX && (b) <= (a)) ? ((a) - (b)) : INTOVERFLOW_MAX)
+#define INTOVERFLOW_MUL(a,b) (((a) < INTOVERFLOW_MAX && (b) < INTOVERFLOW_MAX && (a) < INTOVERFLOW_MAX / (b)) ? ((a) * (b)) : INTOVERFLOW_MAX)
+#define INTOVERFLOW_DIV(a,b) (((a) < INTOVERFLOW_MAX && (b) < INTOVERFLOW_MAX && (b) > 0) ? ((a) / (b)) : INTOVERFLOW_MAX)
+
+#define INTOVERFLOW_NORMALIZE(a) (((a) < INTOVERFLOW_MAX) ? (a) : (INTOVERFLOW_MAX - 1))
+
+#endif