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feat: add string serialization with static size

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This commit is contained in:
Tim Wundenberg
2025-12-10 22:24:00 +01:00
parent 5ee6550073
commit d864d6b90c
2 changed files with 18 additions and 19 deletions
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35
src/protocol.zig
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@@ -10,21 +10,11 @@ const VERSION: u8 = 1;
// Data format: // Data format:
// u8 -> version // u8 -> version
// u16 -> width // list of 100 u8
// u16 -> height
// u8,u8,u8 list of rgb for each pixel, going from left to right, top to bottom
//
// UDP Packet Size: 65,535 Bytes
// 1 Byte = 8 Bits
// 8+16+16 = 40 Bits header
// (65k * 8) - 40 = 524,240
// 8+8+8 = 24
// 24 / 524,240 = 21,843 pixel
// 1920*1080 = 2,073,600 pixel
const Data = struct { const Data = struct {
version: u8, version: u8,
count: u8, message: [100]u8,
}; };
const SerializationError = error{ VersionDoesNotMatchError, OtherError }; const SerializationError = error{ VersionDoesNotMatchError, OtherError };
@@ -34,20 +24,29 @@ fn deserialize(input: []u8) SerializationError!Data {
return SerializationError.OtherError; return SerializationError.OtherError;
} }
return .{ .count = input[0] }; if (input[0] != VERSION) {
return SerializationError.VersionDoesNotMatchError;
}
var message = [_]u8{0} ** 100;
@memcpy(&message, input[1..101]);
return .{ .version = VERSION, .message = message };
} }
fn serialize(allocator: std.mem.Allocator, input: Data) ![]u8 { fn serialize(allocator: std.mem.Allocator, input: Data) ![]u8 {
const data = try allocator.alloc(u8, 1); const data = try allocator.alloc(u8, 1 + input.message.len);
data[0] = input.count; data[0] = input.version;
@memcpy(data[1..], &input.message);
return data; return data;
} }
test "expect DataV1 can be serialized and deserialized" { test "expect DataV1 can be serialized and deserialized" {
const expected: Data = .{ .count = 128 }; const expected: Data = .{ .version = VERSION, .message = [_]u8{ 'T', 'e', 's', 't' } ++ [_]u8{0} ** 96 };
const serialized = try serialize(std.testing.allocator, expected); const serialized = try serialize(std.testing.allocator, expected);
defer std.testing.allocator.free(serialized); defer std.testing.allocator.free(serialized);
const actual = try deserialize(serialized); // const actual = try deserialize(serialized);
try std.testing.expectEqual(expected, actual); try std.testing.expectEqual(expected, null);
} }