Initial community commit

Src/replicant/nu/ByteWriter.h

@@ -0,0 +1,48 @@
+#pragma once
+#include "foundation/types.h"
+/* A simple byte-oriented writer.
+use this instead of manually writing data as this deals with memory alignment issues
+for you.
+memory alignment can be critical and annoying on some architectures (e.g. PowerPC)
+it also handles little-endian/big-endian issues
+
+Usually you just make one of these things on the stack, passing in your buffer and length
+*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+	typedef struct bytewriter_struct_t
+	{
+		size_t byte_length;
+		uint8_t *data_ptr;
+		void *data;
+	} bytewriter_s, *bytewriter_t;
+
+	void bytewriter_init(bytewriter_t byte_writer, void *data, size_t byte_length);
+	static size_t bytewriter_size(bytewriter_t byte_writer) /* returns remaining bytes in stream */
+	{
+		return byte_writer->byte_length;
+	}
+	static void *bytewriter_pointer(bytewriter_t byte_writer) /* returns a pointer to the current bitstream position */
+	{
+		return byte_writer->data_ptr;
+	}
+	static void bytewriter_advance(bytewriter_t byte_writer, size_t bytes) /* advances the byte stream */
+	{
+		byte_writer->byte_length-=bytes;
+		byte_writer->data_ptr+=bytes;
+	}
+
+	void bytewriter_write_n(bytewriter_t byte_writer, const void *source, size_t bytes);
+	void bytewriter_write_zero_n(bytewriter_t byte_writer, size_t bytes);
+	void bytewriter_write_u8(bytewriter_t byte_writer, uint8_t value);
+	void bytewriter_write_u16_le(bytewriter_t byte_writer, uint16_t value);
+	void bytewriter_write_u16_be(bytewriter_t byte_writer, uint16_t value);
+	void bytewriter_write_u32_le(bytewriter_t byte_writer, uint32_t value);
+	void bytewriter_write_u32_be(bytewriter_t byte_writer, uint32_t value);
+	void bytewriter_write_uuid_be(bytewriter_t byte_writer, GUID guid_value);
+#ifdef __cplusplus
+}
+#endif