add lib and module stuff

build.zig

@@ -24,6 +24,8 @@ pub fn build(b: *std.Build) void {
     const run_step = b.step("run", "Run the app");
     run_step.dependOn(&run_cmd.step);
 
+    addModule(b);
+
     // Testing
     const elf_unit_tests = b.addTest(.{
         .root_source_file = b.path("src/elf.zig"),
@@ -36,3 +38,10 @@ pub fn build(b: *std.Build) void {
     const test_step = b.step("test", "Run unit tests");
     test_step.dependOn(&run_elf_unit_tests.step);
 }
+
+/// Module function for depending on the elphin module
+pub fn addModule(b: *std.Build) void {
+    _ = b.addModule("elphin", .{
+        .root_source_file = .{ .path = "src/lib.zig" },
+    });
+}

src/lib.zig

@@ -0,0 +1,22 @@
+const elf = @import("elf.zig");
+const dol = @import("dol.zig");
+
+pub const ELFError = elf.ELFError;
+pub const ELFSegments = elf.ELFSegments;
+
+pub const readELF = elf.readELF;
+pub const createDOLMapping = dol.createDOLMapping;
+pub const writeDOL = dol.writeDOL;
+
+/// Converts an ELF file to a DOL file.
+/// `input` and `output` must be open files.
+pub fn convert(input: anytype, output: anytype) !void {
+    // Read input
+    const map = try elf.readELF(input);
+
+    // Align segments to 64 byte boundaries
+    const dolMap = dol.createDOLMapping(map);
+
+    // Write header and copy over segments from input
+    try dol.writeDOL(dolMap, input, output);
+}

src/main.zig

@@ -1,6 +1,5 @@
 const std = @import("std");
-const elf = @import("elf.zig");
-const dol = @import("dol.zig");
+const lib = @import("lib.zig");
 
 pub fn main() !void {
     // Get allocator
@@ -23,13 +22,10 @@ pub fn main() !void {
     // Read input
     const input = try std.fs.cwd().openFile(inputPath, .{});
     defer input.close();
-    const map = try elf.readELF(input);
-
-    // Align segments to 64 byte boundaries
-    const dolMap = dol.createDOLMapping(map);
 
     // Write header and copy over segments from input
     const output = try std.fs.cwd().createFile(outputPath, .{});
     defer output.close();
-    try dol.writeDOL(dolMap, input, output);
+
+    try lib.convert(input, output);
 }