Fixed a couple decompressor issues.

Re-added ExtractionOptions

src/decomp.zig

@@ -11,8 +11,8 @@ pub const Error = error{
 
 const Decompressor = @This();
 
-alloc: std.mem.Allocator = std.heap.page_allocator,
-vtable: *struct {
+alloc: std.mem.Allocator = std.heap.smp_allocator,
+vtable: *const struct {
     decompress: *const fn (*const Decompressor, in: []u8, out: []u8) Error!usize = defaultDecompress,
     stateless: StatelessDecomp,
 },
@@ -20,9 +20,6 @@ vtable: *struct {
 pub fn decompress(self: *const Decompressor, in: []u8, out: []u8) Error!usize {
     return self.vtable.decompress(self, in, out);
 }
-pub fn stateless(self: Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
-    return self.vtable.stateless(alloc, in, out);
-}
 
 fn defaultDecompress(self: *const Decompressor, in: []u8, out: []u8) Error!usize {
     return self.vtable.stateless(self.alloc, in, out);