1 files changed, 41 insertions, 0 deletions
diff --git a/prism/integer.h b/prism/integer.h
new file mode 100644
index 0000000000..9285986885
--- /dev/null
+++ b/prism/integer.h
@@ -0,0 +1,41 @@
+/**
+ * @file integer.h
+ *
+ * This module provides functions for working with arbitrary-sized integers.
+ */
+#ifndef PRISM_INTEGER_H
+#define PRISM_INTEGER_H
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+/**
+ * A structure represents an arbitrary-sized integer.
+ */
+typedef struct {
+    /**
+     * The number of allocated values. length is set to 0 if the integer fits
+     * into uint32_t.
+     */
+    size_t length;
+
+    /**
+     * List of 32-bit integers. Set to NULL if the integer fits into uint32_t.
+     */
+    uint32_t *values;
+
+    /**
+     * Embedded value for small integer. This value is set to 0 if the value
+     * does not fit into uint32_t.
+     */
+    uint32_t value;
+
+    /**
+     * Whether or not the integer is negative. It is stored this way so that a
+     * zeroed pm_integer_t is always positive zero.
+     */
+    bool negative;
+} pm_integer_t;
+
+#endif