Restructure file module

src/file/read_contents.odin

@@ -0,0 +1,62 @@
+package file
+
+import "core:fmt"
+import "core:os"
+import "core:strings"
+
+// -----------------------------------------
+
+Asset :: struct #all_or_none {
+	relpath: string,
+	size:    i64,
+	data:    []u8,
+}
+
+// -----------------------------------------
+
+read_by_path :: proc(path: string) -> []u8 {
+	f, open_err := os.open(path, {.Read})
+	if open_err != nil {
+		fmt.eprintln("error: open failed:", open_err)
+		os.exit(1)
+	}
+	defer os.close(f)
+
+	if !os.is_file(path) {
+		fmt.eprintln("error: path is not a file:", path)
+		os.exit(1)
+	}
+
+	path := path // shadow parameter
+	path = strings.clone(path)
+
+	size, size_err := os.file_size(f)
+	if size_err != nil {
+		fmt.eprintln("error: get file size failed:", size_err)
+		os.exit(1)
+	}
+
+	data := make([]u8, size)
+
+	n, read_err := os.read_full(f, data)
+	if read_err != nil {
+		delete(data)
+		fmt.eprintln(
+			"error: file read failed:",
+			read_err,
+			"got",
+			n,
+			"of",
+			size,
+			"bytes",
+		)
+		os.exit(1)
+	}
+
+	return data
+}
+
+get_asset_by_path :: proc(path: string) -> Asset {
+	data := read_by_path(path)
+	return Asset{relpath = path, size = cast(i64)len(data), data = data}
+}