Extracted helper functions and bitmasks into separate compilation unit

* utility.h and utility.cc now contain the UTF8-codepoint and unit bitmasks and read / write functions
* Modified users of these functions and unions accordingly
* Added the new compilation unit to the Makefile
* Changed bitmask specification from plain integer literals to shift expressions for better readability

1 files changed, 29 insertions, 0 deletions

diff --git a/src/utility.h b/src/utility.h
new file mode 100644
index 0000000..dcdcf75
--- /dev/null
+++ b/src/utility.h
@@ -0,0 +1,29 @@
+#ifndef CODEPOINT_ITERATOR_UTILITY_H_
+#define CODEPOINT_ITERATOR_UTILITY_H_
+
+#include <cstdint>
+
+namespace UTF8 {
+namespace dtl {
+
+enum class CodeUnitType : uint8_t {
+	CONTINUATION = (128 >> 0),       // 10000000
+	LEADING      = (128 >> 1),       // 01000000
+	THREE        = (128 >> 2),       // 00100000
+	FOUR         = (128 >> 3),       // 00010000
+};
+
+enum class CodePoint : uint8_t {
+	CONTINUATION = (UINT8_MAX >> 2), // 00111111
+	TWO          = (UINT8_MAX >> 3), // 00011111
+	THREE        = (UINT8_MAX >> 4), // 00001111
+	FOUR         = (UINT8_MAX >> 5), // 00000111
+};
+
+bool match(const uint8_t&, CodeUnitType&&);
+void write(char32_t&, const uint8_t&, CodePoint&&, const uint8_t&);
+
+}
+}
+
+#endif  // CODEPOINT_ITERATOR_UTILITY_H_