Better build and project file platform layer

src/project_default.odin

@@ -0,0 +1,61 @@
+#+build !wasm32
+#+build !wasm64p32
+
+package main
+
+import "core:os"
+import "core:io"
+import "core:mem"
+
+ProjectReadErrorType :: enum {
+	FailedReadingHeader,
+	BadHeader,
+	VersionNeedsUpgrade,
+}
+
+ProjectWriteError :: union {
+	os.Error,
+	io.Error,
+}
+
+ProjectReadError :: union {
+	os.Error,
+	io.Error,
+	ProjectReadErrorType,
+}
+
+_project_write :: proc(project: ^ProjectData, path: string) -> ProjectWriteError {
+	f := os.open(path, {.Create, .Trunc, .Write}) or_return
+	defer os.close(f)
+	w := io.to_writer(os.to_stream(f))
+	version: u32 = PROJECT_DATA_VERSION
+	header := PROJECT_DATA_HEADER
+
+	io.write_full(w, transmute([]u8)header) or_return
+	io.write_ptr(w, &version, size_of(version)) or_return
+	io.write_ptr(w, &project.matrix_count, size_of(project.matrix_count)) or_return
+	n := io.write_ptr(w, raw_data(project.matrices), int(project.matrix_count) * 9 * size_of(f32)) or_return
+	os.close(f)
+	return nil
+}
+
+_project_read :: proc(project: ^ProjectData, path: string) -> ProjectReadError {
+	f := os.open(path, {.Read}) or_return
+	defer os.close(f)
+	r := io.to_reader(os.to_stream(f))
+	header := PROJECT_DATA_HEADER
+	header_buffer: [len(PROJECT_DATA_HEADER)]byte
+	if num, err := io.read_full(r, header_buffer[:]); err != nil {
+		return ProjectReadErrorType.FailedReadingHeader
+	}
+	if mem.compare(transmute([]byte)header, header_buffer[:]) != 0 {
+		return ProjectReadErrorType.BadHeader
+	}
+	_ = io.read_ptr(r, &project.version, size_of(project.matrix_count)) or_return
+	if project.version != PROJECT_DATA_VERSION {
+		return ProjectReadErrorType.VersionNeedsUpgrade
+	}
+	_ = io.read_ptr(r, &project.matrix_count, size_of(project.matrix_count)) or_return
+	n := io.read_ptr(r, raw_data(project.matrices), size_of(f32) * len(project.matrices)) or_return
+	return nil
+}