MORE PROGRESS

src/inode.zig

@@ -94,5 +94,6 @@ pub fn deinit(self: Self, alloc: std.mem.Allocator) void {
         .ext_file => |f| alloc.free(f.block_sizes),
         .symlink => |s| alloc.free(s.target),
         .ext_symlink => |s| alloc.free(s.target),
+        else => {},
     }
 }

src/reader.zig

@@ -1,6 +1,7 @@
 const std = @import("std");
 
 const Inode = @import("inode.zig");
+const File = @import("file.zig").File;
 const Table = @import("table.zig").Table;
 const PRead = @import("reader/p_read.zig").PRead;
 const FragEntry = @import("fragment.zig").FragEntry;
@@ -28,7 +29,7 @@ pub fn SfsReader(comptime T: type) type {
         /// Export table. Each element is an inode referce.
         /// If accessing directly, keep in mind, the table starts at inode 1, as such it's recommended to use the InodeAt function instead.
         export_table: Table(Inode.Ref, T) = undefined,
-        root: ?Inode = null,
+        root: ?File(T) = null,
 
         pub fn init(alloc: std.mem.Allocator, rdr: T, offset: u64) !Self {
             var out: Self = .{
@@ -45,7 +46,31 @@ pub fn SfsReader(comptime T: type) type {
             self.id_table.deinit();
             self.frag_table.deinit();
             self.export_table.deinit();
-            // if (self.root != null) self.root.?.deinit();
+            if (self.root != null) self.root.?.deinit();
+        }
+
+        fn populateRoot(self: *Self) !void {
+            if (self.root != null) return;
+            const meta = MetadataReader(T).init(
+                self.alloc,
+                self.super.comp,
+                self.rdr,
+                self.super.inode_start + self.super.root_ref.block,
+            );
+            try meta.skip(self.super.root_ref.offset);
+            const root_inode: Inode = try .init(meta, self.alloc, self.super.block_size);
+            self.root = try .init(self, root_inode, "");
+        }
+
+        pub fn archiveRoot(self: *Self) !File {
+            if (self.root == null) try self.populateRoot();
+            return self.root.?;
+        }
+        pub fn open(self: *Self, path: []const u8) !File {
+            if (self.root == null) try self.populateRoot();
+            _ = path;
+            // return self.root.?.open(path);
+            return error{TODO}.TODO;
         }
 
         /// Returns the inode with the given Inode Number.

src/reader/data.zig

@@ -1,6 +1,6 @@
 const std = @import("std");
 
-const PRead = @import("p_read.zig").Pread;
+const PRead = @import("p_read.zig").PRead;
 const FragEntry = @import("../fragment.zig").FragEntry;
 const BlockSize = @import("../inode/file.zig").BlockSize;
 const Compression = @import("../superblock.zig").Compression;
@@ -10,16 +10,21 @@ pub fn DataReader(comptime T: type) type {
         const Self = @This();
 
         alloc: std.mem.Allocator,
+        pool: ?*std.Thread.Pool = null,
 
         rdr: PRead(T),
         comp: Compression,
-        offsets: []BlockSize,
+        offsets: []u64,
 
         file_size: u64,
         block_size: u32,
         sizes: []BlockSize,
 
-        frag: []u8 = undefined,
+        frag: []u8 = &[0]u8{},
+
+        read_block: []u8,
+        read_offset: u64,
+        read_idx: u32 = 0,
 
         pub fn init(
             alloc: std.mem.Allocator,
@@ -46,10 +51,76 @@ pub fn DataReader(comptime T: type) type {
                 .sizes = sizes,
             };
         }
+        pub fn deinit(self: Self) void {
+            self.alloc.free(self.offsets);
+            self.alloc.free(self.frag);
+        }
 
-        pub fn addFragment(self: *Self, entry: FragEntry, offset: u32) void {
+        pub fn addFragment(self: *Self, entry: FragEntry, offset: u32) !void {
-            self.frag = self.alloc.alloc(u8, self.file_size % self.block_size);
+            self.frag = try self.alloc.alloc(u8, self.file_size % self.block_size);
+            if (entry.size.size == 0) {
+                @memset(self.frag, 0);
+                return;
+            } else if (entry.size.uncompressed) {
+                _ = try self.rdr.pread(self.frag, entry.block + offset);
+                return;
+            }
+            const block = try self.alloc.alloc(u8, offset + self.frag.len);
+            defer self.alloc.free(block);
+            _ = try self.comp.decompress(
+                self.alloc,
+                std.io.limitedReader(
+                    self.rdr.readerAt(entry.block),
+                    entry.size.size,
+                ),
+                block,
+            );
+            @memcpy(self.frag, block[offset..]);
+        }
+        pub fn setPool(self: *Self, pool: *std.Thread.Pool) void {
+            self.pool = pool;
+        }
+
+        fn blockAt(self: Self, idx: u32) ![]u8 {
+            const size = if (idx == self.sizes.len - 1 and self.frag.len == 0) {
+                self.file_size % self.block_size;
+            } else {
+                self.block_size;
+            };
+            const block = try self.alloc.alloc(u8, size);
+            errdefer self.alloc.free(block);
+            if (self.sizes[idx].size == 0) {
+                @memset(block, 0);
+                return block;
+            } else if (self.sizes[idx].uncompressed) {
+                _ = try self.rdr.pread(block, self.offsets[idx]);
+                return block;
+            }
+            _ = try self.comp.decompress(
+                self.alloc,
+                std.io.limitedReader(
+                    self.rdr.readerAt(self.offsets[idx]),
+                    self.sizes[idx].size,
+                ),
+                block,
+            );
+            return block;
+        }
+
+        pub fn read(self: *Self, buf: []u8) !usize {
+            var cur_red: usize = 0;
+            while (cur_red < buf.len) {
+                if (self.read_offset >= self.read_block.len) {
                     //TODO:
                 }
+                //TODO:
+            }
+            return cur_red;
+        }
+
+        /// Write the entire file's contents to the writer.
+        /// If availble, pwrite will be used.
+        /// If a thread pool is not set via setPool, one is created based on cpu thread count.
+        pub fn writeTo(self: Self, writer: anytype) !usize {}
     };
 }

src/reader/metadata.zig

@@ -36,10 +36,9 @@ pub fn MetadataReader(comptime T: type) type {
             _ = try self.rdr.pread(std.mem.asBytes(hdr), self.offset);
             self.offset += 2;
             self.block_size = try self.comp.decompress(
-                8192,
                 self.alloc,
                 std.io.limitedReader(self.rdr.readerAt(self.offset), hdr.size),
-                self.block,
+                &self.block,
             );
             self.offset += hdr.size;
             self.block_offset = 0;

src/superblock.zig

@@ -51,7 +51,7 @@ pub const Compression = enum(u16) {
     lz4,
     zstd,
 
-    pub fn decompress(self: Compression, comptime max_size: u16, alloc: std.mem.Allocator, source: anytype, dest: *[max_size]u8) !usize {
+    pub fn decompress(self: Compression, alloc: std.mem.Allocator, source: anytype, dest: []u8) !usize {
         switch (self) {
             .gzip => {
                 const decomp = std.compress.zlib.decompressor(source);
@@ -70,7 +70,7 @@ pub const Compression = enum(u16) {
             },
             .lz4 => return DecompressError.Lz4Unavailable,
             .zstd => {
-                const window: [@min(std.compress.zstd.DecompressorOptions.default_window_buffer_len, max_size)]u8 = undefined;
+                const window: [@min(std.compress.zstd.DecompressorOptions.default_window_buffer_len, dest.len)]u8 = undefined;
                 const decomp = std.compress.zstd.decompressor(source, .{ .window_buffer = window });
                 return decomp.read(dest);
             },