Break out the impl to a lib

This will make it easier to make a C library.

1 files changed, 0 insertions, 211 deletions

diff --git a/src/saprus_message.zig b/src/saprus_message.zig
deleted file mode 100644
index 3d47f66..0000000
--- a/src/saprus_message.zig
+++ /dev/null
@@ -1,211 +0,0 @@
-const base64Enc = std.base64.Base64Encoder.init(std.base64.standard_alphabet_chars, '=');
-const base64Dec = std.base64.Base64Decoder.init(std.base64.standard_alphabet_chars, '=');
-
-/// Type tag for SaprusMessage union.
-/// This is the first value in the actual packet sent over the network.
-pub const SaprusPacketType = enum(u16) {
-    relay = 0x003C,
-    file_transfer = 0x8888,
-    connection = 0x00E9,
-    _,
-};
-
-/// Reserved option values.
-/// Currently unused.
-pub const SaprusConnectionOptions = packed struct(u8) {
-    opt1: bool = false,
-    opt2: bool = false,
-    opt3: bool = false,
-    opt4: bool = false,
-    opt5: bool = false,
-    opt6: bool = false,
-    opt7: bool = false,
-    opt8: bool = false,
-};
-
-pub const SaprusError = error{
-    NotImplementedSaprusType,
-    UnknownSaprusType,
-};
-
-/// All Saprus messages
-pub const SaprusMessage = union(SaprusPacketType) {
-    pub const Relay = struct {
-        pub const Header = packed struct {
-            dest: @Vector(4, u8),
-        };
-        header: Header,
-        payload: []const u8,
-    };
-    pub const Connection = struct {
-        pub const Header = packed struct {
-            src_port: u16, // random number > 1024
-            dest_port: u16, // random number > 1024
-            seq_num: u32 = 0,
-            msg_id: u32 = 0,
-            reserved: u8 = 0,
-            options: SaprusConnectionOptions = .{},
-        };
-        header: Header,
-        payload: []const u8,
-    };
-    relay: Relay,
-    file_transfer: void, // unimplemented
-    connection: Connection,
-
-    /// Should be called for any SaprusMessage that was declared using a function that you pass an allocator to.
-    pub fn deinit(self: SaprusMessage, allocator: Allocator) void {
-        switch (self) {
-            .relay => |r| allocator.free(r.payload),
-            .connection => |c| allocator.free(c.payload),
-            else => unreachable,
-        }
-    }
-
-    fn toBytesAux(
-        header: anytype,
-        payload: []const u8,
-        buf: *std.ArrayList(u8),
-        allocator: Allocator,
-    ) !void {
-        const Header = @TypeOf(header);
-        // Create a growable string to store the base64 bytes in.
-        // Doing this first so I can use the length of the encoded bytes for the length field.
-        var payload_list = std.ArrayList(u8).init(allocator);
-        defer payload_list.deinit();
-        const buf_w = payload_list.writer();
-
-        // Write the payload bytes as base64 to the growable string.
-        try base64Enc.encodeWriter(buf_w, payload);
-
-        // At this point, payload_list contains the base64 encoded payload.
-
-        // Add the payload length to the output buf.
-        try buf.*.appendSlice(
-            asBytes(&nativeToBig(u16, @intCast(payload_list.items.len + @bitSizeOf(Header) / 8))),
-        );
-
-        // Add the header bytes to the output buf.
-        var header_buf: [@sizeOf(Header)]u8 = undefined;
-        var header_buf_stream = std.io.fixedBufferStream(&header_buf);
-        try header_buf_stream.writer().writeStructEndian(header, .big);
-        // Add the exact number of bits in the header without padding.
-        try buf.*.appendSlice(header_buf[0 .. @bitSizeOf(Header) / 8]);
-
-        try buf.*.appendSlice(payload_list.items);
-    }
-
-    /// Caller is responsible for freeing the returned bytes.
-    pub fn toBytes(self: SaprusMessage, allocator: Allocator) ![]u8 {
-        // Create a growable list of bytes to store the output in.
-        var buf = std.ArrayList(u8).init(allocator);
-        errdefer buf.deinit();
-
-        // Start with writing the message type, which is the first 16 bits of every Saprus message.
-        try buf.appendSlice(asBytes(&nativeToBig(u16, @intFromEnum(self))));
-
-        // Write the proper header and payload for the given packet type.
-        switch (self) {
-            .relay => |r| try toBytesAux(r.header, r.payload, &buf, allocator),
-            .connection => |c| try toBytesAux(c.header, c.payload, &buf, allocator),
-            .file_transfer => return SaprusError.NotImplementedSaprusType,
-        }
-
-        // Collect the growable list as a slice and return it.
-        return buf.toOwnedSlice();
-    }
-
-    fn fromBytesAux(
-        comptime packet: SaprusPacketType,
-        len: u16,
-        r: std.io.FixedBufferStream([]const u8).Reader,
-        allocator: Allocator,
-    ) !SaprusMessage {
-        const Header = @field(@FieldType(SaprusMessage, @tagName(packet)), "Header");
-
-        // Read the header for the current message type.
-        var header_bytes: [@sizeOf(Header)]u8 = undefined;
-        _ = try r.read(header_bytes[0 .. @bitSizeOf(Header) / 8]);
-        var header_stream = std.io.fixedBufferStream(&header_bytes);
-        const header = try header_stream.reader().readStructEndian(Header, .big);
-
-        // Read the base64 bytes into a list to be able to call the decoder on it.
-        const payload_buf = try allocator.alloc(u8, len - @bitSizeOf(Header) / 8);
-        defer allocator.free(payload_buf);
-        _ = try r.readAll(payload_buf);
-
-        // Create a buffer to store the payload in, and decode the base64 bytes into the payload field.
-        const payload = try allocator.alloc(u8, try base64Dec.calcSizeForSlice(payload_buf));
-        try base64Dec.decode(payload, payload_buf);
-
-        // Return the type of SaprusMessage specified by the `packet` argument.
-        return @unionInit(SaprusMessage, @tagName(packet), .{
-            .header = header,
-            .payload = payload,
-        });
-    }
-
-    /// Caller is responsible for calling .deinit on the returned value.
-    pub fn fromBytes(bytes: []const u8, allocator: Allocator) !SaprusMessage {
-        var s = std.io.fixedBufferStream(bytes);
-        const r = s.reader();
-
-        // Read packet type
-        const packet_type = @as(SaprusPacketType, @enumFromInt(try r.readInt(u16, .big)));
-
-        // Read the length of the header + base64 encoded payload.
-        const len = try r.readInt(u16, .big);
-
-        switch (packet_type) {
-            .relay => return fromBytesAux(.relay, len, r, allocator),
-            .connection => return fromBytesAux(.connection, len, r, allocator),
-            .file_transfer => return SaprusError.NotImplementedSaprusType,
-            else => return SaprusError.UnknownSaprusType,
-        }
-    }
-};
-
-const std = @import("std");
-const Allocator = std.mem.Allocator;
-
-const asBytes = std.mem.asBytes;
-const nativeToBig = std.mem.nativeToBig;
-
-test "Round trip Relay toBytes and fromBytes" {
-    const gpa = std.testing.allocator;
-    const msg = SaprusMessage{
-        .relay = .{
-            .header = .{ .dest = .{ 255, 255, 255, 255 } },
-            .payload = "Hello darkness my old friend",
-        },
-    };
-
-    const to_bytes = try msg.toBytes(gpa);
-    defer gpa.free(to_bytes);
-
-    const from_bytes = try SaprusMessage.fromBytes(to_bytes, gpa);
-    defer from_bytes.deinit(gpa);
-
-    try std.testing.expectEqualDeep(msg, from_bytes);
-}
-
-test "Round trip Connection toBytes and fromBytes" {
-    const gpa = std.testing.allocator;
-    const msg = SaprusMessage{
-        .connection = .{
-            .header = .{
-                .src_port = 0,
-                .dest_port = 0,
-            },
-            .payload = "Hello darkness my old friend",
-        },
-    };
-
-    const to_bytes = try msg.toBytes(gpa);
-    defer gpa.free(to_bytes);
-
-    const from_bytes = try SaprusMessage.fromBytes(to_bytes, gpa);
-    defer from_bytes.deinit(gpa);
-
-    try std.testing.expectEqualDeep(msg, from_bytes);
-}