Re-added all C decompressors

Some cleanup
Remove inode arena
Added deinit to Archive to destroy the File.MemoryMap

src/decomp/c_xz.zig

@@ -0,0 +1,48 @@
+const std = @import("std");
+const Io = std.Io;
+const Reader = std.Io.Reader;
+const zstd = std.compress.zstd;
+const Node = std.SinglyLinkedList.Node;
+
+const c = @import("c");
+
+const Decompressor = @import("../util/decompressor.zig");
+const Error = Decompressor.Error;
+
+const Queue = std.Io.Queue(c.lzma_stream);
+
+const Self = @This();
+
+pub const stateless_decompressor: Decompressor = .{ .decomp_fn = statelessDecomp };
+
+fn statelessDecomp(_: ?*const Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+    var stream: c.lzma_stream = .{
+        .allocator = &.{
+            .alloc = lzmaAlloc,
+            .free = lzmaFree,
+            .@"opaque" = @constCast(&alloc),
+        },
+        .next_in = in.ptr,
+        .avail_in = in.len,
+        .next_out = out.ptr,
+        .avail_out = out.len,
+    };
+
+    var res = c.lzma_alone_decoder(&stream, stream.avail_out * 2);
+    if (res != c.LZMA_OK) return Error.ReadFailed;
+    while (res == c.LZMA_OK)
+        res = c.lzma_code(&stream, c.LZMA_RUN);
+    if (res != c.LZMA_FINISH) return Error.ReadFailed;
+    return stream.total_out;
+}
+
+// lzma_allocator
+
+fn lzmaAlloc(ptr: ?*anyopaque, size: usize, _: usize) callconv(.c) ?*anyopaque {
+    var alloc: *std.mem.Allocator = @ptrCast(@alignCast(@constCast(ptr)));
+    return alloc.rawAlloc(size, .@"1", 0);
+}
+fn lzmaFree(ptr: ?*anyopaque, mem_ptr: ?*anyopaque) callconv(.c) void {
+    var alloc: *std.mem.Allocator = @ptrCast(@alignCast(@constCast(ptr)));
+    alloc.rawFree(@ptrCast(mem_ptr), .@"1", 0);
+}