Add stream structure and utilities

src/base/stream/stream.c

@@ -0,0 +1,40 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#include "stream.h"
+#include "../../common/aliases/aliases.h"
+#include "../../common/assert/assert.h"
+
+void _streamValidate(const WpStream *stream, u64 item_size);
+
+b8 _streamAtEnd(const WpStream *stream, u64 item_size) {
+	_streamValidate(stream, item_size);
+	return stream->position >= stream->count;
+}
+
+b8 _streamHasNext(const WpStream *stream, u64 item_size) {
+	_streamValidate(stream, item_size);
+	return stream->position + 1 < stream->count;
+}
+
+void *_streamPeek(const WpStream *stream, u64 item_size) {
+	if (_streamHasNext(stream, item_size)) {
+		u64 index = (stream->position + 1) * stream->item_size;
+		return (void *)(&((u8 *)(stream->data))[index]);
+	}
+
+	return NULL;
+}
+
+void *_streamConsume(WpStream *stream, u64 item_size) {
+	if (!_streamAtEnd(stream, item_size)) {
+		u64 index = stream->position++ * stream->item_size;
+		return (void *)(&((u8 *)(stream->data))[index]);
+	}
+
+	return NULL;
+}
+
+void _streamValidate(const WpStream *stream, u64 item_size) {
+	wpDebugAssert(stream != NULL, "`stream` should not be NULL");
+	wpRuntimeAssert(stream->item_size == item_size, "Invalid item type provided");
+}