Fixed missed merge text (oops)

Changed all *const Decompressor to *Decompressor
Changed all decompressors to only stateless (my queues are borked)

README.md

@@ -44,17 +44,17 @@ This is some basic observation's I've made about this library's performance when
 Currently, my only performance checks are checking execution time, nothing deeper.
 
 * Currently, using my test archive, performance aproximately matches `unsquashfs` when multi-threaded, but significantly slower when single-threaded.
-* Using Zig decompression libraries *significantly* increases decompression time by 5x. Under ideal circumstances.
+* Using Zig decompression libraries *significantly* increases decompression time.
 * Performance improvements/regressions will be common. I'm still learning Zig.
 
 Example Times:
 
-* *unsquashfs, multi-threaded*: .15s
+* *unsquashfs, multi-threaded*: .11s
-* *unsquashfs, single-threaded*: .16s
+* *unsquashfs, single-threaded*: .13s
-* *C-libs, single-threaded*: .36s
+* *C-libs, multi-threaded*: .10s
-* *C-libs, multi-threaded*: .14s
+* *C-libs, single-threaded*: ..28s
-* *Zig-libs, single-threaded*: CURRENTLY UNTESTED
+* *Zig-libs, single-threaded*: .74s
-* *Zig-libs, multi-threaded*: .76s
+* *Zig-libs, multi-threaded*: 2.70s
 
 ## Build considerations
 

build.zig

@@ -3,10 +3,7 @@ const std = @import("std");
 pub fn build(b: *std.Build) !void {
     const use_zig_decomp = b.option(bool, "use_zig_decomp", "Use zig standard library for decompression.") orelse false;
     const allow_lzo = b.option(bool, "allow_lzo", "Compile with lzo support") orelse false;
-<<<<<<< HEAD
-=======
     const dynamic = b.option(bool, "dynamic", "Dynamicly link C decompression libraries") orelse false;
->>>>>>> dfbfbda (Build is working again (on Zig master branch))
     var debug = b.option(bool, "debug", "Enable options to make debugging easier.");
     const version_string_option = b.option([]const u8, "version", "Version of the library/binary");
 
@@ -22,12 +19,6 @@ pub fn build(b: *std.Build) !void {
     if (optimize == .Debug)
         debug = true;
 
-    const c = b.addTranslateC(.{
-        .optimize = optimize,
-        .target = target,
-        .root_source_file = b.path("src/c.h"),
-    });
-
     const lib = b.addLibrary(.{
         .name = "squashfs",
         .root_module = b.createModule(.{
@@ -35,15 +26,8 @@ pub fn build(b: *std.Build) !void {
             .target = target,
             .valgrind = debug,
             .root_source_file = b.path("src/root.zig"),
-<<<<<<< HEAD
-            // .link_libc = true,
             .imports = &.{
                 .{ .name = "options", .module = zig_squashfs_options.createModule() },
-                .{ .name = "c", .module = c.createModule() },
-=======
-            .imports = &.{
-                .{ .name = "options", .module = zig_squashfs_options.createModule() },
->>>>>>> dfbfbda (Build is working again (on Zig master branch))
             },
         }),
         .use_llvm = debug,
@@ -51,20 +35,6 @@ pub fn build(b: *std.Build) !void {
 
     const deps = try dependencies(b, optimize, target, use_zig_decomp, allow_lzo, dynamic);
     defer b.allocator.free(deps);
-
-<<<<<<< HEAD
-    const zng = b.dependency("zlib_ng", .{ .optimize = optimize, .target = target });
-    lib.root_module.linkLibrary(zng.artifact("zng"));
-
-    const xz = b.dependency("xz", .{ .optimize = optimize, .target = target });
-    lib.root_module.linkLibrary(xz.artifact("lzma"));
-
-    const minilzo = b.dependency("minilzo", .{ .optimize = optimize, .target = target });
-    lib.root_module.linkLibrary(minilzo.artifact("minilzo"));
-
-    const lz4 = b.dependency("lz4", .{ .optimize = optimize, .target = target });
-    lib.root_module.linkLibrary(lz4.artifact("lz4"));
-=======
     for (deps) |d|
         lib.root_module.linkLibrary(d);
 
@@ -80,7 +50,6 @@ pub fn build(b: *std.Build) !void {
         if (dynamic)
             dynamicLinkLibraries(c, allow_lzo);
     }
->>>>>>> dfbfbda (Build is working again (on Zig master branch))
 
     var version = version_string_option orelse "0.0.0-testing";
     if (version[0] == 'v') version = version[1..];

src/archive.zig

@@ -16,7 +16,7 @@ const Archive = @This();
 file: OffsetFile,
 super: Superblock,
 
-stateless_decomp: *const Decompressor,
+stateless_decomp: Decompressor,
 
 pub fn init(io: Io, file: std.Io.File, offset: u64) !Archive {
     var rdr = file.reader(io, &[0]u8{});
@@ -37,20 +37,20 @@ pub fn deinit(self: *Archive, io: Io) void {
 }
 
 /// The root folder of the Archive. Used to open other Files.
-pub fn root(self: Archive, alloc: std.mem.Allocator) !File {
+pub fn root(self: *Archive, alloc: std.mem.Allocator) !File {
     const root_inode = try Utils.inodeFromRef(
         alloc,
         self.file,
-        self.stateless_decomp,
+        &self.stateless_decomp,
         self.super.inode_start,
         self.super.block_size,
         self.super.root_ref,
     );
-    return .init(alloc, self, root_inode, "");
+    return .init(alloc, self.*, root_inode, "");
 }
 /// Opens a File within the archive.
-pub fn open(self: Archive, alloc: std.mem.Allocator, io: Io, filepath: []const u8) !File {
+pub fn open(self: *Archive, alloc: std.mem.Allocator, io: Io, filepath: []const u8) !File {
-    const root_file = try self.root(alloc);
+    var root_file = try self.root(alloc);
     const path = std.mem.trim(u8, filepath, "/");
     if (Utils.pathIsSelf(path))
         return root_file;
@@ -60,7 +60,7 @@ pub fn open(self: Archive, alloc: std.mem.Allocator, io: Io, filepath: []const u
 
 /// Returns the inode with the given inode number.
 /// Requires that the archive is exportable (has an export lookup table).
-pub fn inode(self: Archive, alloc: std.mem.Allocator, io: Io, num: u32) !Inode {
+pub fn inode(self: *Archive, alloc: std.mem.Allocator, io: Io, num: u32) !Inode {
     if (!self.super.flags.exportable)
         return error.NotExportable;
     const ref = try LookupTable.lookupValue(
@@ -83,7 +83,7 @@ pub fn inode(self: Archive, alloc: std.mem.Allocator, io: Io, num: u32) !Inode {
     );
 }
 /// Returns a value at the given index from the Archive's id (uid/gid) table.
-pub fn idTable(self: Archive, alloc: std.mem.Allocator, io: Io, idx: u32) !u16 {
+pub fn idTable(self: *Archive, alloc: std.mem.Allocator, io: Io, idx: u32) !u16 {
     return LookupTable.lookupValue(
         u16,
         alloc,
@@ -96,11 +96,11 @@ pub fn idTable(self: Archive, alloc: std.mem.Allocator, io: Io, idx: u32) !u16 {
 }
 
 /// Extract the entire archive contents to the given directory.
-pub fn extract(self: Archive, alloc: std.mem.Allocator, io: Io, extract_dir: []const u8, options: ExtractionOptions) !void {
+pub fn extract(self: *Archive, alloc: std.mem.Allocator, io: Io, extract_dir: []const u8, options: ExtractionOptions) !void {
     const root_inode = try Utils.inodeFromRef(
         alloc,
         self.file,
-        self.stateless_decomp,
+        &self.stateless_decomp,
         self.super.inode_start,
         self.super.block_size,
         self.super.root_ref,

src/bin/unsquashfs.zig

@@ -41,7 +41,10 @@ var force: bool = false;
 
 pub fn main(init: std.process.Init) !void {
     const alloc = init.gpa;
-    const io = init.io;
+    // const io = init.io;
+    var evented: Io.Evented = undefined;
+    try evented.init(alloc, .{});
+    const io = evented.io();
 
     var stdout = std.Io.File.stdout();
     defer stdout.close(io);

src/c.h

@@ -1,5 +1,7 @@
 #include <zstd.h>
 #include <zlib-ng.h>
-// #include <lzma.h>
+#include <lzma.h>
+#ifdef ALLOW_LZO
 #include <lzo/minilzo.h>
+#endif
 #include <lz4.h>

src/decomp.zig

@@ -3,18 +3,12 @@ const Io = std.Io;
 
 const options = @import("options");
 
-const lzma = @import("decomp/zig_lzma.zig");
-const xz = @import("decomp/zig_xz.zig");
 const Decompressor = @import("util/decompressor.zig");
 
 const zlib = if (options.use_zig_decomp) @import("decomp/zig_zlib.zig") else @import("decomp/c_zlib.zig");
-<<<<<<< HEAD
-const lzo = if (options.use_zig_decomp or !options.allow_lzo) void else @import("decomp/c_lzo.zig");
-=======
 const lzma = if (options.use_zig_decomp) @import("decomp/zig_lzma.zig") else @import("decomp/c_lzma.zig");
-const lzo = if (options.use_zig_decomp or options.allow_lzo) void else @import("decomp/c_lzo.zig");
+const lzo = if (options.use_zig_decomp or !options.allow_lzo) void else @import("decomp/c_lzo.zig");
 const xz = if (options.use_zig_decomp) @import("decomp/zig_xz.zig") else @import("decomp/c_xz.zig");
->>>>>>> dfbfbda (Build is working again (on Zig master branch))
 const lz4 = if (options.use_zig_decomp) void else @import("decomp/c_lz4.zig");
 const zstd = if (options.use_zig_decomp) @import("decomp/zig_zstd.zig") else @import("decomp/c_zstd.zig");
 
@@ -27,20 +21,20 @@ pub const Enum = enum(u16) {
     zstd,
 };
 
-pub fn StatelessDecomp(val: Enum) !*const Decompressor {
+pub fn StatelessDecomp(val: Enum) !Decompressor {
     return switch (val) {
-        .gzip => &zlib.stateless_decompressor,
+        .gzip => zlib.stateless_decompressor,
-        .lzma => &lzma.stateless_decompressor,
+        .lzma => lzma.stateless_decompressor,
         .lzo => if (options.use_zig_decomp or !options.allow_lzo)
             error.LzoUnsupported
         else
-            &lzo.stateless_decompressor,
+            lzo.stateless_decompressor,
-        .xz => &xz.stateless_decompressor,
+        .xz => xz.stateless_decompressor,
         .lz4 => if (options.use_zig_decomp)
             error.Lz4Unsupported
         else
-            &lz4.stateless_decompressor,
+            lz4.stateless_decompressor,
-        .zstd => &zstd.stateless_decompressor,
+        .zstd => zstd.stateless_decompressor,
     };
 }
 
@@ -52,16 +46,6 @@ pub const Decomp = union(enum) {
     lz4: lz4,
     zstd: zstd,
 
-<<<<<<< HEAD
-    pub fn init(val: Enum, alloc: std.mem.Allocator, io: std.Io, block_size: u32) !Decomp {
-        return switch (val) {
-            .gzip => .{ .gzip = zlib.init(alloc, io, block_size) },
-            .lzma => .{ .lzma = .{} },
-            .lzo => .{ .lzo = .{} },
-            .xz => .{ .xz = .{} },
-            .lz4 => .{ .lz4 = .{} },
-            .zstd => .{ .zstd = zstd.init(alloc, io, block_size) },
-=======
     pub fn init(val: Enum, alloc: std.mem.Allocator, io: Io, block_size: u32) !Decomp {
         return switch (val) {
             .gzip => .{ .gzip = if (options.use_zig_decomp) try zlib.init(alloc, io, block_size) else try zlib.init(alloc, io) },
@@ -70,7 +54,6 @@ pub const Decomp = union(enum) {
             .xz => .{ .xz = if (options.use_zig_decomp) try xz.init(alloc, io, block_size) else .{} },
             .lz4 => if (options.use_zig_decomp) error.Lz4Unsupported else .{ .lz4 = .{} },
             .zstd => .{ .zstd = if (options.use_zig_decomp) try zstd.init(alloc, io, block_size) else try zstd.init(alloc, io) },
->>>>>>> dfbfbda (Build is working again (on Zig master branch))
         };
     }
     pub fn deinit(self: *Decomp, alloc: std.mem.Allocator) void {
@@ -91,13 +74,13 @@ pub const Decomp = union(enum) {
         }
     }
 
-    pub fn decompressor(self: *Decomp) *const Decompressor {
+    pub fn decompressor(self: *Decomp) *Decompressor {
         return switch (self.*) {
             .gzip => &self.gzip.interface,
-            .lzma => &lzma.stateless_decompressor,
+            .lzma => &self.lzma.interface,
-            .lzo => if (options.use_zig_decomp or !options.allow_lzo) unreachable else &lzo.stateless_decompressor,
+            .lzo => if (options.use_zig_decomp or !options.allow_lzo) unreachable else &self.lzo.interface,
-            .xz => &xz.stateless_decompressor,
+            .xz => &self.xz.interface,
-            .lz4 => if (options.use_zig_decomp) unreachable else &lz4.stateless_decompressor,
+            .lz4 => if (options.use_zig_decomp) unreachable else &self.lz4.interface,
             .zstd => &self.zstd.interface,
         };
     }

src/decomp/c_lz4.zig

@@ -7,13 +7,11 @@ const Error = Decompressor.Error;
 
 pub const stateless_decompressor: Decompressor = .{ .decomp_fn = statelessDecomp };
 
-fn statelessDecomp(_: ?*const Decompressor, _: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+interface: Decompressor = .{ .decomp_fn = statelessDecomp },
-<<<<<<< HEAD
+
-    const res = c.LZ4_decompress_fast(in.ptr, out.ptr, @truncate(out.len));
+fn statelessDecomp(_: ?*Decompressor, _: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
-=======
     const out_len: c_int = @bitCast(@as(u32, @truncate(out.len)));
     const res = c.LZ4_decompress_fast(in.ptr, out.ptr, out_len);
->>>>>>> dfbfbda (Build is working again (on Zig master branch))
     if (res < 0) return Error.ReadFailed;
     return @abs(res);
 }

src/decomp/c_lzma.zig

@@ -15,7 +15,9 @@ const Self = @This();
 
 pub const stateless_decompressor: Decompressor = .{ .decomp_fn = statelessDecomp };
 
-fn statelessDecomp(_: ?*const Decompressor, _: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+interface: Decompressor = .{ .decomp_fn = statelessDecomp },
+
+fn statelessDecomp(_: ?*Decompressor, _: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
     var stream: c.lzma_stream = .{
         .next_in = in.ptr,
         .avail_in = in.len,

src/decomp/c_lzo.zig

@@ -15,7 +15,9 @@ const Self = @This();
 
 pub const stateless_decompressor: Decompressor = .{ .decomp_fn = statelessDecomp };
 
-fn statelessDecomp(_: ?*const Decompressor, _: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+interface: Decompressor = .{ .decomp_fn = statelessDecomp },
+
+fn statelessDecomp(_: ?*Decompressor, _: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
     _ = c.lzo_init();
     var out_len = out.len;
     const res = c.lzo1x_decompress_safe(in.ptr, in.len, out.ptr, &out_len, null);

src/decomp/c_xz.zig

@@ -15,7 +15,9 @@ const Self = @This();
 
 pub const stateless_decompressor: Decompressor = .{ .decomp_fn = statelessDecomp };
 
-fn statelessDecomp(_: ?*const Decompressor, _: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+interface: Decompressor = .{ .decomp_fn = statelessDecomp },
+
+fn statelessDecomp(_: ?*Decompressor, _: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
     var stream: c.lzma_stream = .{
         .next_in = in.ptr,
         .avail_in = in.len,

src/decomp/c_zlib.zig

@@ -38,7 +38,7 @@ pub fn deinit(self: *Self, alloc: std.mem.Allocator) void {
     alloc.free(self.ctx);
 }
 
-fn decomp(d: ?*const Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+fn decomp(d: ?*Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
     if (d == null) {
         return statelessDecomp(d, alloc, in, out);
     }
@@ -68,7 +68,7 @@ inline fn zlibDecomp(stream: *c.zng_stream) !void {
 
 pub const stateless_decompressor: Decompressor = .{ .decomp_fn = statelessDecomp };
 
-fn statelessDecomp(_: ?*const Decompressor, _: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+fn statelessDecomp(_: ?*Decompressor, _: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
     var stream: c.zng_stream = .{
         .next_in = in.ptr,
         .avail_in = @truncate(in.len),
@@ -78,20 +78,3 @@ fn statelessDecomp(_: ?*const Decompressor, _: std.mem.Allocator, in: []u8, out:
     try zlibDecomp(&stream);
     return stream.total_out;
 }
-
-// zalloc
-
-fn zalloc(ptr: ?*anyopaque, size: c_uint, len: c_uint) callconv(.c) ?*anyopaque {
-    var alloc: *std.mem.Allocator = @ptrCast(@alignCast(ptr));
-    return alloc.rawAlloc(size * len, .@"1", 0);
-}
-fn zfree(ptr: ?*anyopaque, mem_ptr: ?*anyopaque) callconv(.c) void {
-<<<<<<< HEAD
-    var alloc: *std.mem.Allocator = @ptrCast(@alignCast(ptr));
-    alloc.rawFree(@ptrCast(mem_ptr), .@"1", 0);
-=======
-    if (mem_ptr == null) return;
-    var alloc: *std.mem.Allocator = @ptrCast(@alignCast(ptr));
-    alloc.free(@as([*]u8, @ptrCast(mem_ptr.?)));
->>>>>>> dfbfbda (Build is working again (on Zig master branch))
-}

src/decomp/c_zstd.zig

@@ -40,30 +40,28 @@ pub fn deinit(self: *Self, alloc: std.mem.Allocator) void {
     alloc.free(self.ctx);
 }
 
-fn decomp(d: ?*const Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+fn decomp(d: ?*Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
-    // TODO: Fix
+    if (d == null) {
-    //
-    // if (d == null) {
         return statelessDecomp(d, alloc, in, out);
-    // }
+    }
-    // var self: *Self = @fieldParentPtr("interface", @constCast(d.?));
+    var self: *Self = @fieldParentPtr("interface", @constCast(d.?));
 
-    // const ctx = self.ctx_queue.getOne(self.io) catch return Error.ReadFailed;
+    const ctx = self.ctx_queue.getOne(self.io) catch return Error.ReadFailed;
-    // defer self.ctx_queue.putOne(self.io, ctx) catch {};
+    defer self.ctx_queue.putOne(self.io, ctx) catch {};
 
-    // _ = c.ZSTD_DCtx_reset(ctx, c.ZSTD_reset_session_only);
+    _ = c.ZSTD_DCtx_reset(ctx, c.ZSTD_reset_session_only);
 
-    // const res = c.ZSTD_decompressDCtx(ctx, out.ptr, out.len, in.ptr, in.len);
+    const res = c.ZSTD_decompressDCtx(ctx, out.ptr, out.len, in.ptr, in.len);
-    // if (c.ZSTD_isError(res) != 0)
+    if (c.ZSTD_isError(res) != 0)
-    //     return Error.ReadFailed;
+        return Error.ReadFailed;
-    // return res;
+    return res;
 }
 
 // Stateless
 
 pub const stateless_decompressor: Decompressor = .{ .decomp_fn = statelessDecomp };
 
-fn statelessDecomp(_: ?*const Decompressor, _: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+fn statelessDecomp(_: ?*Decompressor, _: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
     const res = c.ZSTD_decompress(out.ptr, out.len, in.ptr, in.len);
     if (c.ZSTD_isError(res) != 0)
         return Error.ReadFailed;

src/decomp/zig_lzma.zig

@@ -47,7 +47,7 @@ pub fn deinit(self: *Self) void {
     self.alloc.free(self.buf);
 }
 
-fn decomp(d: ?*const Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+fn decomp(d: ?*Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
     if (d == null) {
         return statelessDecomp(d, alloc, in, out);
     }
@@ -74,7 +74,7 @@ inline fn lzmaDecomp(alloc: std.mem.Allocator, buffer: *[]u8, in: []u8, out: []u
 
 pub const stateless_decompressor: Decompressor = .{ .decomp_fn = statelessDecomp };
 
-fn statelessDecomp(_: ?*const Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+fn statelessDecomp(_: ?*Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
     var buf = try alloc.alloc(u8, in.len);
     defer alloc.free(buf);
     return lzmaDecomp(alloc, &buf, in, out) catch return Error.ReadFailed;

src/decomp/zig_xz.zig

@@ -47,7 +47,7 @@ pub fn deinit(self: *Self) void {
     self.alloc.free(self.buf);
 }
 
-fn decomp(d: ?*const Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+fn decomp(d: ?*Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
     if (d == null) {
         return statelessDecomp(d, alloc, in, out);
     }
@@ -74,7 +74,7 @@ inline fn xzDecomp(alloc: std.mem.Allocator, buffer: *[]u8, in: []u8, out: []u8)
 
 pub const stateless_decompressor: Decompressor = .{ .decomp_fn = statelessDecomp };
 
-fn statelessDecomp(_: ?*const Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+fn statelessDecomp(_: ?*Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
     var buf = try alloc.alloc(u8, in.len);
     defer alloc.free(buf);
     return xzDecomp(alloc, &buf, in, out) catch return Error.ReadFailed;

src/decomp/zig_zlib.zig

@@ -47,7 +47,7 @@ pub fn deinit(self: *Self) void {
     self.alloc.free(self.buf);
 }
 
-fn decomp(d: ?*const Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+fn decomp(d: ?*Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
     if (d == null) {
         return statelessDecomp(d, alloc, in, out);
     }
@@ -70,7 +70,7 @@ inline fn zlibDecomp(buffer: []u8, in: []u8, out: []u8) !usize {
 
 pub const stateless_decompressor: Decompressor = .{ .decomp_fn = statelessDecomp };
 
-fn statelessDecomp(_: ?*const Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+fn statelessDecomp(_: ?*Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
     const buf = try alloc.alloc(u8, out.len);
     defer alloc.free(buf);
     return zlibDecomp(buf, in, out);

src/decomp/zig_zstd.zig

@@ -41,7 +41,7 @@ pub fn deinit(self: *Self) void {
     self.alloc.free(self.buf);
 }
 
-fn decomp(d: ?*const Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+fn decomp(d: ?*Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
     if (d == null) {
         const buf = try alloc.alloc(u8, in.len * 2);
         defer alloc.free(buf);
@@ -66,7 +66,7 @@ inline fn zstdDecomp(buffer: []u8, in: []u8, out: []u8) !usize {
 
 pub const stateless_decompressor: Decompressor = .{ .decomp_fn = statelessDecomp };
 
-fn statelessDecomp(_: ?*const Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+fn statelessDecomp(_: ?*Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
     const buf = try alloc.alloc(u8, out.len + zstd.block_size_max);
     defer alloc.free(buf);
     return zstdDecomp(buf, in, out);

src/file.zig

@@ -10,7 +10,6 @@ const Inode = @import("inode.zig");
 const DataExtractor = @import("util/data_extractor.zig");
 const Decompressor = @import("util/decompressor.zig");
 const MetadataReader = @import("util/metadata.zig");
-const SharedCache = @import("util/shared_cache.zig");
 
 const File = @This();
 
@@ -35,25 +34,25 @@ pub fn init(alloc: std.mem.Allocator, archive: Archive, in: Inode, name: []const
         .name = new_name,
     };
 }
-pub fn fromDirEntry(alloc: std.mem.Allocator, archive: Archive, ent: DirEntry) !File {
+pub fn fromDirEntry(alloc: std.mem.Allocator, archive: *Archive, ent: DirEntry) !File {
     var rdr = archive.file.readerAt(archive.super.inode_start + ent.block_start);
-    var meta: MetadataReader = .init(alloc, &rdr, archive.stateless_decomp);
+    var meta: MetadataReader = .init(alloc, &rdr, &archive.stateless_decomp);
     try meta.interface.discardAll(ent.block_offset);
 
     var in: Inode = try .read(alloc, &meta.interface, archive.super.block_size);
     errdefer in.deinit(alloc);
-    return .init(alloc, archive, in, ent.name);
+    return .init(alloc, archive.*, in, ent.name);
 }
 pub fn deinit(self: File) void {
     self.alloc.free(self.name);
     self.inode.deinit(self.alloc);
 }
 
-pub fn open(self: File, alloc: std.mem.Allocator, io: Io, filepath: []const u8) !File {
+pub fn open(self: *File, alloc: std.mem.Allocator, io: Io, filepath: []const u8) !File {
     const entries = try self.inode.readDirectory(
         alloc,
         self.archive.file,
-        self.archive.stateless_decomp,
+        &self.archive.stateless_decomp,
         self.archive.super.dir_start,
     );
     defer {
@@ -76,7 +75,7 @@ pub fn open(self: File, alloc: std.mem.Allocator, io: Io, filepath: []const u8)
         }
     } else return Error.FileNotFound;
 
-    const first_elem_file = try fromDirEntry(alloc, self.archive, search_slice[idx]);
+    var first_elem_file = try fromDirEntry(alloc, &self.archive, search_slice[idx]);
     if (first_element.len == path.len)
         return first_elem_file;
     defer first_elem_file.deinit();

src/frag.zig

@@ -17,7 +17,7 @@ pub const FragEntry = extern struct {
 
 alloc: std.mem.Allocator,
 fil: OffsetFile,
-decomp: *const Decompressor,
+decomp: *Decompressor,
 block_size: u32,
 
 entries: []FragEntry,
@@ -25,7 +25,7 @@ entries: []FragEntry,
 frag_cache: std.array_hash_map.Auto(u32, []u8),
 cache_mut: std.Io.RwLock = .init,
 
-pub fn init(alloc: std.mem.Allocator, fil: OffsetFile, decomp: *const Decompressor, frag_start: u64, frag_num: u32, block_size: u32) !FragManager {
+pub fn init(alloc: std.mem.Allocator, fil: OffsetFile, decomp: *Decompressor, frag_start: u64, frag_num: u32, block_size: u32) !FragManager {
     const first_offset: u64 = std.mem.readInt(u64, @ptrCast(fil.map.memory[frag_start .. frag_start + 8]), .little);
 
     var rdr = fil.readerAt(first_offset);

src/inode.zig

@@ -20,7 +20,6 @@ const DataReader = @import("util/data_reader.zig");
 const Decompressor = @import("util/decompressor.zig");
 const MetadataReader = @import("util/metadata.zig");
 const OffsetFile = @import("util/offset_file.zig");
-const SharedCache = @import("util/shared_cache.zig");
 const XattrTable = @import("xattr_table.zig");
 
 const Inode = @This();
@@ -64,14 +63,14 @@ pub fn deinit(self: Inode, alloc: std.mem.Allocator) void {
 // Utility Functions
 
 /// Read the directory entries
-pub fn readDirectory(self: Inode, alloc: std.mem.Allocator, fil: OffsetFile, decomp: *const Decompressor, dir_offset: u64) ![]DirEntry {
+pub fn readDirectory(self: Inode, alloc: std.mem.Allocator, fil: OffsetFile, decomp: *Decompressor, dir_offset: u64) ![]DirEntry {
     return switch (self.data) {
         .dir => |d| readDirFromData(alloc, fil, decomp, dir_offset, d),
         .ext_dir => |d| readDirFromData(alloc, fil, decomp, dir_offset, d),
         else => Error.NotDirectory,
     };
 }
-fn readDirFromData(alloc: std.mem.Allocator, fil: OffsetFile, decomp: *const Decompressor, dir_offset: u64, d: anytype) ![]DirEntry {
+fn readDirFromData(alloc: std.mem.Allocator, fil: OffsetFile, decomp: *Decompressor, dir_offset: u64, d: anytype) ![]DirEntry {
     var rdr = fil.readerAt(dir_offset + d.block_start);
     var meta: MetadataReader = .init(alloc, &rdr, decomp);
     try meta.interface.discardAll(d.block_offset);
@@ -79,34 +78,34 @@ fn readDirFromData(alloc: std.mem.Allocator, fil: OffsetFile, decomp: *const Dec
     return DirEntry.readDirectory(alloc, &meta.interface, d.size);
 }
 /// Get a reader for a regular file's data.
-pub fn dataReader(self: Inode, alloc: std.mem.Allocator, io: Io, fil: OffsetFile, cache: *SharedCache, decomp: *const Decompressor, block_size: u32) !DataReader {
+pub fn dataReader(self: Inode, alloc: std.mem.Allocator, io: Io, fil: OffsetFile, decomp: *Decompressor, block_size: u32, frag_block: ?[]u8) !DataReader {
     return switch (self.data) {
-        .file => |f| getReaderFromData(alloc, io, fil, cache, decomp, block_size, f),
+        .file => |f| getReaderFromData(alloc, io, fil, decomp, block_size, frag_block, f),
-        .ext_file => |f| getReaderFromData(alloc, io, fil, cache, decomp, block_size, f),
+        .ext_file => |f| getReaderFromData(alloc, io, fil, decomp, block_size, frag_block, f),
         else => Error.NotRegularFile,
     };
 }
-fn getReaderFromData(alloc: std.mem.Allocator, io: Io, fil: OffsetFile, cache: *SharedCache, decomp: *const Decompressor, block_size: u32, d: anytype) !DataReader {
+fn getReaderFromData(alloc: std.mem.Allocator, io: Io, fil: OffsetFile, decomp: *Decompressor, block_size: u32, frag_block: ?[]u8, d: anytype) !DataReader {
-    const ext: DataReader = .init(alloc, io, fil, cache, decomp, block_size, d.size, d.block_start, d.blocks);
+    const ext: DataReader = .init(alloc, io, fil, decomp, block_size, d.size, d.block_start, d.blocks);
     if (d.frag_block_offset == 0xFFFFFFFF) {
-        // TODO:
+        if (frag_block == null) return error.FragBlockNotProvided;
-        return error.TODO;
+        ext.addFrag(d.frag_block_offset, frag_block.?);
     }
     return ext;
 }
 /// Get an extractor for a regular file's data.
-pub fn dataExtractor(self: Inode, fil: OffsetFile, cache: *SharedCache, decomp: *const Decompressor, block_size: u32) !DataExtractor {
+pub fn dataExtractor(self: Inode, fil: OffsetFile, decomp: *Decompressor, block_size: u32, frag_block: ?[]u8) !DataExtractor {
     return switch (self.data) {
-        .file => |f| getExtractorFromData(fil, cache, decomp, block_size, f),
+        .file => |f| getExtractorFromData(fil, decomp, block_size, frag_block, f),
-        .ext_file => |f| getExtractorFromData(fil, cache, decomp, block_size, f),
+        .ext_file => |f| getExtractorFromData(fil, decomp, block_size, frag_block, f),
         else => Error.NotRegularFile,
     };
 }
-fn getExtractorFromData(fil: OffsetFile, cache: *SharedCache, decomp: *const Decompressor, block_size: u32, d: anytype) !DataExtractor {
+fn getExtractorFromData(fil: OffsetFile, decomp: *Decompressor, block_size: u32, frag_block: ?[]u8, d: anytype) !DataExtractor {
-    const ext: DataExtractor = .init(fil, cache, decomp, block_size, d.size, d.block_start, d.blocks);
+    const ext: DataExtractor = .init(fil, decomp, block_size, d.size, d.block_start, d.blocks);
     if (d.frag_block_offset == 0xFFFFFFFF) {
-        // TODO:
+        if (frag_block == null) return error.FragBlockNotProvided;
-        return error.TODO;
+        ext.addFrag(d.frag_block_offset, frag_block.?);
     }
     return ext;
 }
@@ -119,11 +118,11 @@ pub fn symlinkTarget(self: Inode) ![]const u8 {
     };
 }
 /// Get inode's gid
-pub fn gid(self: Inode, alloc: std.mem.Allocator, io: Io, fil: OffsetFile, decomp: *const Decompressor, id_table_start: u64) !u16 {
+pub fn gid(self: Inode, alloc: std.mem.Allocator, io: Io, fil: OffsetFile, decomp: *Decompressor, id_table_start: u64) !u16 {
     return LookupTable.lookupValue(u16, alloc, io, decomp, fil, id_table_start, self.hdr.gid_idx);
 }
 /// Get inode's uid
-pub fn uid(self: Inode, alloc: std.mem.Allocator, io: Io, fil: OffsetFile, decomp: *const Decompressor, id_table_start: u64) !u16 {
+pub fn uid(self: Inode, alloc: std.mem.Allocator, io: Io, fil: OffsetFile, decomp: *Decompressor, id_table_start: u64) !u16 {
     return LookupTable.lookupValue(u16, alloc, io, decomp, fil, id_table_start, self.hdr.uid_idx);
 }
 /// Get the inode's xattr values as an index into the Archive's xattr table.
@@ -143,7 +142,7 @@ pub fn xattrIndex(self: Inode) !u32 {
     return idx;
 }
 // Get an inode's xattr values. If the inode does not have xattr values (including if the inode is not an extended type), an empty slice is returned.
-pub fn xattrValues(self: Inode, alloc: std.mem.Allocator, io: Io, fil: OffsetFile, decomp: *const Decompressor, xattr_table_start: u64) ![]XattrTable.XattrOwned {
+pub fn xattrValues(self: Inode, alloc: std.mem.Allocator, io: Io, fil: OffsetFile, decomp: *Decompressor, xattr_table_start: u64) ![]XattrTable.XattrOwned {
     const idx = self.xattrIndex() catch &[0]XattrTable.XattrOwned{};
     return XattrTable.statelessLookup(alloc, io, decomp, fil, xattr_table_start, idx);
 }
@@ -275,9 +274,8 @@ pub fn extract(
 ) !void {
     const path = std.mem.trimEnd(u8, filepath, "/");
 
-    var decomp_base: Decomp = try .init(super.compression, alloc, io, super.block_size);
+    var decomp_base: Decompressor = try @import("decomp.zig").StatelessDecomp(super.compression); // TODO: Replace with actual Decomp value to share states & caches for efficiency.
-    decomp_base.deinit(alloc);
+    const decomp = &decomp_base;
-    const decomp = decomp_base.decompressor();
 
     var frag_mgr: FragManager = try .init(alloc, fil, decomp, super.frag_start, super.frag_count, super.block_size);
     defer frag_mgr.deinit(io);
@@ -301,7 +299,7 @@ fn extractRealAsync(
     io: Io,
     fil: OffsetFile,
     super: Archive.Superblock,
-    decomp: *const Decompressor,
+    decomp: *Decompressor,
     sel: *Io.Select(ExtractReturnUnion),
     frag_mgr: *FragManager,
     path: []const u8,
@@ -407,7 +405,7 @@ fn extractRealAsync(
         .origin = origin,
     };
 }
-fn finishLoop(alloc: std.mem.Allocator, io: Io, fil: OffsetFile, decomp: *const Decompressor, super: Archive.Superblock, options: ExtractionOptions, sel: *Io.Select(ExtractReturnUnion)) !void {
+fn finishLoop(alloc: std.mem.Allocator, io: Io, fil: OffsetFile, decomp: *Decompressor, super: Archive.Superblock, options: ExtractionOptions, sel: *Io.Select(ExtractReturnUnion)) !void {
     var id_table: CachedTable(u16) = .init(alloc, fil, decomp, super.id_start, super.id_count);
     defer id_table.deinit(io);
 
@@ -473,7 +471,7 @@ fn extractSinglethreaded(
     super: Archive.Superblock,
     path: []const u8,
     options: ExtractionOptions,
-    decomp: *const Decompressor,
+    decomp: *Decompressor,
     frag: *FragManager,
 ) !void {
     var id_table: CachedTable(u16) = .init(alloc, fil, decomp, super.id_start, super.id_count);
@@ -504,7 +502,7 @@ fn extractReal(
     io: Io,
     fil: OffsetFile,
     super: Archive.Superblock,
-    decomp: *const Decompressor,
+    decomp: *Decompressor,
     frag_mgr: *FragManager,
     id_table: *CachedTable(u16),
     xattr_table: ?*XattrTable,

src/lookup_table.zig

@@ -5,7 +5,7 @@ const Decompressor = @import("util/decompressor.zig");
 const MetadataReader = @import("util/metadata.zig");
 const OffsetFile = @import("util/offset_file.zig");
 
-pub fn lookupValue(comptime T: anytype, alloc: std.mem.Allocator, decomp: *const Decompressor, file: OffsetFile, table_start: u64, idx: u32) !T {
+pub fn lookupValue(comptime T: anytype, alloc: std.mem.Allocator, decomp: *Decompressor, file: OffsetFile, table_start: u64, idx: u32) !T {
     const T_PER_BLOCK: u16 = 8192 / @sizeOf(T);
 
     const block = idx / T_PER_BLOCK;
@@ -33,7 +33,7 @@ pub fn CachedTable(comptime T: anytype) type {
 
         alloc: std.mem.Allocator,
         fil: OffsetFile,
-        decomp: *const Decompressor,
+        decomp: *Decompressor,
 
         table_start: u64,
         total_num: u32,
@@ -42,7 +42,7 @@ pub fn CachedTable(comptime T: anytype) type {
 
         mut: Io.RwLock = .init,
 
-        pub fn init(alloc: std.mem.Allocator, fil: OffsetFile, decomp: *const Decompressor, offset: u64, total_num: u32) Table {
+        pub fn init(alloc: std.mem.Allocator, fil: OffsetFile, decomp: *Decompressor, offset: u64, total_num: u32) Table {
             return .{
                 .alloc = alloc,
                 .fil = fil,

src/util/data_extractor.zig

@@ -15,7 +15,7 @@ pub const Error = Decompressor.Error || Io.File.MemoryMap.CreateError || Io.File
 const DataExtractor = @This();
 
 fil: OffsetFile,
-decomp: *const Decompressor,
+decomp: *Decompressor,
 block_size: u32,
 
 file_size: u64,
@@ -27,7 +27,7 @@ frag_block: ?[]u8 = null,
 
 err: ?Error = null,
 
-pub fn init(fil: OffsetFile, decomp: *const Decompressor, block_size: u32, file_size: u64, data_start: u64, blocks: []BlockSize) DataExtractor {
+pub fn init(fil: OffsetFile, decomp: *Decompressor, block_size: u32, file_size: u64, data_start: u64, blocks: []BlockSize) DataExtractor {
     return .{
         .fil = fil,
         .decomp = decomp,

src/util/data_reader.zig

@@ -18,7 +18,7 @@ alloc: std.mem.Allocator,
 
 fil: OffsetFile,
 io: Io,
-decomp: *const Decompressor,
+decomp: *Decompressor,
 block_size: u32,
 
 file_size: u64,
@@ -33,7 +33,7 @@ sparse_block: bool = false,
 
 interface: Io.Reader,
 
-pub fn init(alloc: std.mem.Allocator, io: Io, fil: OffsetFile, decomp: *const Decompressor, block_size: u32, file_size: u64, data_start: u64, blocks: []BlockSize) !DataReader {
+pub fn init(alloc: std.mem.Allocator, io: Io, fil: OffsetFile, decomp: *Decompressor, block_size: u32, file_size: u64, data_start: u64, blocks: []BlockSize) !DataReader {
     return .{
         .alloc = alloc,
 

src/util/decompressor.zig

@@ -8,8 +8,8 @@ pub const Error = std.Io.Reader.StreamError || std.mem.Allocator.Error;
 
 /// The actual decompression function.
 /// If the given decompressor is null, then the decompression should be done "stateless" without lasting allocations.
-decomp_fn: *const fn (?*const Decompressor, std.mem.Allocator, in: []u8, out: []u8) Error!usize,
+decomp_fn: *const fn (?*Decompressor, std.mem.Allocator, in: []u8, out: []u8) Error!usize,
 
-pub fn Decompress(self: *const Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
+pub fn Decompress(self: *Decompressor, alloc: std.mem.Allocator, in: []u8, out: []u8) Error!usize {
     return self.decomp_fn(self, alloc, in, out);
 }

src/util/metadata.zig

@@ -15,7 +15,7 @@ const This = @This();
 
 alloc: std.mem.Allocator,
 rdr: *Reader,
-decomp: *const Decompressor,
+decomp: *Decompressor,
 
 cur_block_start: u32 = 0,
 next_start_start: u32 = 0,
@@ -34,7 +34,7 @@ interface: Reader = .{
     },
 },
 
-pub fn init(alloc: std.mem.Allocator, rdr: *Reader, decomp: *const Decompressor) This {
+pub fn init(alloc: std.mem.Allocator, rdr: *Reader, decomp: *Decompressor) This {
     return .{
         .alloc = alloc,
         .rdr = rdr,

src/util/misc.zig

@@ -16,7 +16,7 @@ pub fn pathIsSelf(path: []const u8) bool {
     return path[0] == '.';
 }
 /// Creates an Inode from an Inode.Ref.
-pub fn inodeFromRef(alloc: std.mem.Allocator, file: OffsetFile, decomp: *const Decompressor, inode_start: u64, block_size: u32, ref: Inode.Ref) !Inode {
+pub fn inodeFromRef(alloc: std.mem.Allocator, file: OffsetFile, decomp: *Decompressor, inode_start: u64, block_size: u32, ref: Inode.Ref) !Inode {
     var rdr = file.readerAt(inode_start + ref.block_start);
     var meta: MetadataReader = .init(alloc, &rdr, decomp);
     try meta.interface.discardAll(ref.block_offset);

src/util/shared_cache.zig

@@ -1,52 +0,0 @@
-const std = @import("std");
-const Io = std.Io;
-const Node = std.SinglyLinkedList.Node;
-
-const SharedCache = @This();
-
-pub const CACHE_SIZE = 1024 * 1024;
-
-pub const BufferNode = struct {
-    node: Node,
-    cache: [CACHE_SIZE]u8,
-};
-
-alloc: std.mem.Allocator,
-
-caches: std.ArrayList(BufferNode),
-cache_queue: std.SinglyLinkedList,
-queue_mut: Io.Mutex,
-
-pub fn init(alloc: std.mem.Allocator, init_cache_size: u32) !SharedCache {
-    const caches: std.ArrayList(BufferNode) = try .initCapacity(alloc, init_cache_size);
-    var queue: std.SinglyLinkedList = .{};
-    for (caches.items) |item|
-        queue.prepend(&item.node);
-    return .{
-        .alloc = alloc,
-
-        .caches = caches,
-        .cache_queue = queue,
-    };
-}
-pub fn deinit(self: *SharedCache) void {
-    self.caches.deinit(self.alloc);
-}
-
-pub fn getCache(self: *SharedCache, io: Io) !*BufferNode {
-    self.queue_mut.lock(io);
-    const nxt = self.cache_queue.popFirst();
-    self.queue_mut.unlock(io);
-    if (nxt == null) {
-        const new = try self.caches.addOne(self.alloc);
-        new.* = .{
-            .node = .{},
-            .cache = undefined,
-        };
-        return new;
-    }
-    return @fieldParentPtr("node", nxt.?);
-}
-pub fn returnCache(self: *SharedCache, buf: *BufferNode) void {
-    self.cache_queue.prepend(buf);
-}

src/xattr_table.zig

@@ -12,7 +12,7 @@ const XattrCachedTable = @This();
 alloc: std.mem.Allocator,
 
 fil: OffsetFile,
-decomp: *const Decompressor,
+decomp: *Decompressor,
 
 kv_start: u64,
 
@@ -20,7 +20,7 @@ table: LookupTable.CachedTable(TableValue),
 value_cache: std.AutoHashMap(InodeRef, []const u8),
 value_mut: Io.RwLock = .init,
 
-pub fn init(alloc: std.mem.Allocator, fil: OffsetFile, decomp: *const Decompressor, xattr_start: u64) !XattrCachedTable {
+pub fn init(alloc: std.mem.Allocator, fil: OffsetFile, decomp: *Decompressor, xattr_start: u64) !XattrCachedTable {
     const start: u64 = std.mem.readInt(u64, @ptrCast(fil.map.memory[xattr_start .. xattr_start + 8]), .little);
     const num: u64 = std.mem.readInt(u64, @ptrCast(fil.map.memory[xattr_start + 8 .. xattr_start + 16]), .little);
 
@@ -212,7 +212,7 @@ const XattrPrefix = packed struct(u16) {
 
 // Stateless
 
-pub fn statelessLookup(alloc: std.mem.Allocator, io: Io, decomp: *const Decompressor, fil: OffsetFile, table_start: u64, idx: u16) ![]XattrOwned {
+pub fn statelessLookup(alloc: std.mem.Allocator, io: Io, decomp: *Decompressor, fil: OffsetFile, table_start: u64, idx: u16) ![]XattrOwned {
     const kv_start: u64 = std.mem.readInt(u64, @ptrCast(fil.map.memory[table_start .. table_start + 8]), .little);
 
     const lookup = try LookupTable.lookupValue(TableValue, alloc, io, decomp, fil, table_start + 16, idx);