Revive windows support.

It had been broken for a while due to a (now fixed) bug in zig and a couple other problems.

build.zig

@@ -59,14 +59,21 @@ pub fn build(b: *std.build.Builder) !void {
 			"portaudio/src/common/pa_trace.c",
 		}, &[_][]const u8{"-g", "-O3"});
 		if(target.getOsTag() == .windows) {
-			// TODO: Choose a host API
+			// windows:
+			exe.addCSourceFiles(&[_][]const u8 {"portaudio/src/os/win/pa_win_coinitialize.c", "portaudio/src/os/win/pa_win_hostapis.c", "portaudio/src/os/win/pa_win_util.c", "portaudio/src/os/win/pa_win_waveformat.c", "portaudio/src/os/win/pa_win_wdmks_utils.c", "portaudio/src/os/win/pa_x86_plain_converters.c", }, &[_][]const u8{"-g", "-O3", "-DPA_USE_WASAPI"});
+			exe.addIncludePath("portaudio/src/os/win");
+			exe.linkSystemLibrary("ole32");
+			exe.linkSystemLibrary("winmm");
+			exe.linkSystemLibrary("uuid");
+			// WASAPI:
+			exe.addCSourceFiles(&[_][]const u8 {"portaudio/src/hostapi/wasapi/pa_win_wasapi.c"}, &[_][]const u8{"-g", "-O3"});
 		} else if(target.getOsTag() == .linux) {
 			// unix:
 			exe.addCSourceFiles(&[_][]const u8 {"portaudio/src/os/unix/pa_unix_hostapis.c", "portaudio/src/os/unix/pa_unix_util.c"}, &[_][]const u8{"-g", "-O3", "-DPA_USE_ALSA"});
 			exe.addIncludePath("portaudio/src/os/unix");
 			// ALSA:
 			exe.addCSourceFiles(&[_][]const u8 {"portaudio/src/hostapi/alsa/pa_linux_alsa.c"}, &[_][]const u8{"-g", "-O3"});
-			exe.linkSystemLibrary("alsa");
+			exe.linkSystemLibrary("asound");
 		} else {
 			std.log.err("Unsupported target: {}\n", .{ target.getOsTag() });
 		}

src/network.zig

@@ -60,14 +60,32 @@ const Socket = struct {
 	}
 
 	fn receive(self: Socket, buffer: []u8, timeout: i32, resultAddress: *Address) ![]u8 {
+		if(builtin.os.tag == .windows) { // Of course Windows always has it's own special thing.
+			var pfd = [1]os.pollfd {
+				.{.fd = self.socketID, .events = std.c.POLL.RDNORM | std.c.POLL.RDBAND, .revents = undefined},
+			};
+			const length = os.windows.ws2_32.WSAPoll(&pfd, pfd.len, timeout); // TODO: #16122
+			if (length == os.windows.ws2_32.SOCKET_ERROR) {
+                switch (os.windows.ws2_32.WSAGetLastError()) {
+                    .WSANOTINITIALISED => unreachable,
+                    .WSAENETDOWN => return error.NetworkSubsystemFailed,
+                    .WSAENOBUFS => return error.SystemResources,
+                    // TODO: handle more errors
+                    else => |err| return os.windows.unexpectedWSAError(err),
+                }
+            } else if(length == 0) {
+                return error.Timeout;
+            }
+		} else {
 			var pfd = [1]os.pollfd {
 				.{.fd = self.socketID, .events = os.POLL.IN, .revents = undefined},
 			};
-		var length = try os.poll(&pfd, timeout);
+			const length = try os.poll(&pfd, timeout);
-		if(length == 0) return error.Timeout;
+			if(length == 0) return error.Timeout; return error.Timeout;
+		}
 		var addr: os.sockaddr.in = undefined;
 		var addrLen: os.socklen_t = @sizeOf(os.sockaddr.in);
-		length = try os.recvfrom(self.socketID, buffer, 0,  @ptrCast(*os.sockaddr, &addr), &addrLen);
+		const length = try os.recvfrom(self.socketID, buffer, 0,  @ptrCast(*os.sockaddr, &addr), &addrLen);
 		resultAddress.ip = addr.addr;
 		resultAddress.port = @byteSwap(addr.port);
 		return buffer[0..length];

src/utils.zig

@@ -1,5 +1,6 @@
 const std = @import("std");
 const Allocator = std.mem.Allocator;
+const builtin = @import("builtin");
 
 const main = @import("main.zig");
 
@@ -29,6 +30,14 @@ pub const Compression = struct {
 		while(try walker.next()) |entry| {
 			if(entry.kind == .file) {
 				var relPath = entry.path;
+				if(builtin.os.tag == .windows) { // I hate you
+					const copy = try main.threadAllocator.dupe(u8, relPath);
+					std.mem.replaceScalar(u8, copy, '\\', '/');
+					relPath = copy;
+				}
+				defer if(builtin.os.tag == .windows) {
+					main.threadAllocator.free(relPath);
+				};
 				var len: [4]u8 = undefined;
 				std.mem.writeIntBig(u32, &len, @intCast(u32, relPath.len));
 				_ = try comp.write(&len);