Further progress

Mainly focusing on getting things more consistent

src/extract_options.zig

@@ -1,6 +1,24 @@
-dereference_symlinks: bool,
-unbreak_symlinks: bool,
-ignore_permissions: bool,
+const std = @import("std");
+
+const Self = @This();
+
+/// Replace symlinks with their targets
+dereference_symlinks: bool = false,
+/// Always extract a symlink's target if it's part of the archive.
+/// May result in the symlink's target being changed.
+unbreak_symlinks: bool = false,
+/// Do not set file's permissions & owner when extracted.
+ignore_permissions: bool = false,
 
-processor_count: u16,
 // max_memory: u64,
+
+pol: std.Thread.Pool = undefined,
+
+pub fn init(alloc: std.mem.Allocator, thread_count: u16) !Self {
+    var out: Self = .{};
+    out.pol.init(.{
+        .allocator = alloc,
+        .n_jobs = thread_count,
+    });
+    return out;
+}

src/file.zig

@@ -1,3 +1,84 @@
+const std = @import("std");
+
+const dir = @import("directory.zig");
+
+const DirEntry = dir.Entry;
+const Inode = @import("inode.zig");
+const SfsReader = @import("reader.zig").SfsReader;
+const ToReader = @import("reader/to_read.zig").ToRead;
+const ExtractionOptions = @import("extract_options.zig");
+const Compression = @import("superblock.zig").Compression;
+const MetadataReader = @import("reader/metadata.zig").MetadataReader;
+
+pub const FileError = error{
+    NotRegular,
+    NotDirectory,
+};
+
 pub fn File(comptime T: type) type {
-    return struct {};
+    return struct {
+        const Self = @This();
+
+        rdr: *SfsReader(T),
+
+        inode: Inode,
+        name: []const u8,
+
+        /// Directory entries. Only populated on directories.
+        entries: ?[]DirEntry = null,
+        /// File reader. Only populated on regular files.
+        // data_reader: ?DataReader
+
+        pub fn init(rdr: *SfsReader(T), inode: Inode, name: []const u8) !Self {
+            var out = Self{
+                .rdr = rdr,
+                .inode = inode,
+                .name = name,
+            };
+            switch (inode.data) {
+                .dir => |d| {
+                    const meta = MetadataReader(T).init(
+                        rdr.alloc,
+                        rdr.super.comp,
+                        rdr.rdr,
+                        d.block + rdr.super.dir_start,
+                    );
+                    try meta.skip(d.offset);
+                    out.entries = try dir.readDirectory(rdr.alloc, meta, d.size);
+                },
+                .ext_dir => |d| {
+                    const meta = MetadataReader(T).init(
+                        rdr.alloc,
+                        rdr.super.comp,
+                        rdr.rdr,
+                        d.block + rdr.super.dir_start,
+                    );
+                    try meta.skip(d.offset);
+                    out.entries = try dir.readDirectory(rdr.alloc, meta, d.size);
+                },
+                .file => |f| {
+                    _ = f;
+                    //TODO
+                },
+                .ext_file => |f| {
+                    _ = f;
+                    //TODO
+                },
+            }
+            return out;
+        }
+        pub fn deinit(self: Self) void {
+            self.rdr.alloc.free(self.name);
+            self.inode.deinit(self.rdr.alloc);
+            if (self.entries != null) {
+                for (self.entries.?) |e| {
+                    e.deinit(self.rdr.alloc);
+                }
+                self.rdr.alloc.free(self.entries.?);
+            }
+            // if(self.data_reader != null){
+            //     self.data_reader.?.deinit();
+            // }
+        }
+    };
 }

src/inode.zig

@@ -4,6 +4,8 @@ const dir = @import("inode/dir.zig");
 const file = @import("inode/file.zig");
 const misc = @import("inode/misc.zig");
 
+const Reader = @import("reader.zig");
+const DirEntry = @import("directory.zig").Entry;
 const ToRead = @import("reader/to_read.zig").ToRead;
 const Compression = @import("superblock.zig").Compression;
 const MetadataReader = @import("reader/metadata.zig").MetadataReader;
@@ -86,10 +88,11 @@ pub fn init(rdr: anytype, alloc: std.mem.Allocator, block_size: u32) !Self {
         .data = data,
     };
 }
-pub fn initFromRef(p_rdr: anytype, comp: Compression, ref: Ref, table_start: u64, alloc: std.mem.Allocator, block_size: u32) !Self {
-    const rdr: ToRead(@TypeOf(p_rdr)) = .init(p_rdr, ref.block + table_start);
-    const meta_rdr: MetadataReader(ToRead(@TypeOf(p_rdr))) = try .init(alloc, comp, rdr);
-    defer meta_rdr.deinit();
-    try meta_rdr.skip(ref.offset);
-    return init(meta_rdr, alloc, block_size);
+pub fn deinit(self: Self, alloc: std.mem.Allocator) void {
+    switch (self.data) {
+        .file => |f| alloc.free(f.block_sizes),
+        .ext_file => |f| alloc.free(f.block_sizes),
+        .symlink => |s| alloc.free(s.target),
+        .ext_symlink => |s| alloc.free(s.target),
+    }
 }

src/reader.zig

@@ -5,8 +5,13 @@ const Table = @import("table.zig").Table;
 const PRead = @import("reader/p_read.zig").PRead;
 const FragEntry = @import("fragment.zig").FragEntry;
 const Superblock = @import("superblock.zig").Superblock;
+const MetadataReader = @import("reader/metadata.zig").MetadataReader;
 
-pub fn Reader(comptime T: type) type {
+pub const SfsError = error{
+    NotExportable,
+};
+
+pub fn SfsReader(comptime T: type) type {
     comptime std.debug.assert(std.meta.hasFn(T, "pread"));
 
     return struct {
@@ -40,14 +45,22 @@ pub fn Reader(comptime T: type) type {
             self.id_table.deinit();
             self.frag_table.deinit();
             self.export_table.deinit();
+            // if (self.root != null) self.root.?.deinit();
         }
 
         /// Returns the inode with the given Inode Number.
-        /// Requires for the archive to have an export table.
-        pub fn InodeAt(self: Self, num: u32) !Inode {
+        /// Requires the archive to have an export table.
+        pub fn inodeAt(self: Self, num: u32) !Inode {
+            if (!self.super.flags.has_export) return SfsError.NotExportable;
             const ref = try self.export_table.get(num - 1);
-            _ = ref;
-            return error{TODO}.TODO;
+            const meta = MetadataReader(T).init(
+                self.alloc,
+                self.super.comp,
+                self.rdr,
+                self.super.inode_start + ref.block,
+            );
+            try meta.skip(ref.offset);
+            return .init(meta, self.alloc, self.super.block_size);
         }
     };
 }

src/reader/data.zig

@@ -0,0 +1,55 @@
+const std = @import("std");
+
+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;
+
+pub fn DataReader(comptime T: type) type {
+    return struct {
+        const Self = @This();
+
+        alloc: std.mem.Allocator,
+
+        rdr: PRead(T),
+        comp: Compression,
+        offsets: []BlockSize,
+
+        file_size: u64,
+        block_size: u32,
+        sizes: []BlockSize,
+
+        frag: []u8 = undefined,
+
+        pub fn init(
+            alloc: std.mem.Allocator,
+            rdr: PRead(T),
+            comp: Compression,
+            init_offset: u64,
+            file_size: u64,
+            sizes: []BlockSize,
+            block_size: u32,
+        ) !Self {
+            var cur_offset = init_offset;
+            const offsets = alloc.alloc(u64, sizes.len);
+            for (0..sizes.len) |i| {
+                offsets[i] = cur_offset;
+                cur_offset += sizes[i].size;
+            }
+            return .{
+                .alloc = alloc,
+                .rdr = rdr,
+                .comp = comp,
+                .offsets = offsets,
+                .file_size = file_size,
+                .block_size = block_size,
+                .sizes = sizes,
+            };
+        }
+
+        pub fn addFragment(self: *Self, entry: FragEntry, offset: u32) void {
+            self.frag = self.alloc.alloc(u8, self.file_size % self.block_size);
+            //TODO:
+        }
+    };
+}

src/reader/metadata.zig

@@ -1,5 +1,6 @@
 const std = @import("std");
 
+const PRead = @import("p_read.zig").PRead;
 const Compression = @import("../superblock.zig").Compression;
 
 const MetaHeader = packed struct {
@@ -14,36 +15,44 @@ pub fn MetadataReader(comptime T: type) type {
 
         alloc: std.mem.Allocator,
         comp: Compression,
-        rdr: T,
+        rdr: PRead(T),
+        offset: u64,
 
         block: [8192]u8 = undefined,
         block_size: usize = 0,
         block_offset: u32 = 0,
 
-        pub fn init(alloc: std.mem.Allocator, comp: Compression, rdr: T) !Self {
-            var out: Self = .{
+        pub fn init(alloc: std.mem.Allocator, comp: Compression, rdr: PRead(T), offset: u64) Self {
+            return .{
                 .alloc = alloc,
                 .comp = comp,
                 .rdr = rdr,
+                .offset = offset,
             };
-            try out.readNextBlock();
-            return out;
         }
 
         fn readNextBlock(self: *Self) !void {
             const hdr: MetaHeader = undefined;
-            _ = try self.rdr.read(std.mem.asBytes(hdr));
+            _ = 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, hdr.size),
+                std.io.limitedReader(self.rdr.readerAt(self.offset), hdr.size),
                 self.block,
             );
+            self.offset += hdr.size;
             self.block_offset = 0;
         }
 
         pub fn skip(self: *Self, offset: u32) !void {
             var skipped = 0;
+            const hdr: MetaHeader = undefined;
+            while (offset - skipped >= 8192) {
+                _ = try self.rdr.pread(std.mem.asBytes(hdr), self.offset);
+                self.offset += 2 + hdr.size;
+                skipped += 8192;
+            }
             var to_skip = 0;
             while (skipped < offset) {
                 if (self.block_offset >= self.block_size) try self.readNextBlock();

src/root.zig

@@ -1,6 +1,6 @@
 const std = @import("std");
 
-pub const Reader = @import("reader.zig").Reader;
+pub const SfsReader = @import("reader.zig").SfsReader;
 pub const ExtractionOptions = @import("extract_options.zig");
 
-pub const FileReader = Reader(std.fs.File);
+pub const FileReader = SfsReader(std.fs.File);

src/superblock.zig

@@ -38,7 +38,7 @@ pub const Superblock = packed struct {
     export_start: u64,
 };
 
-const DecompressError = error{
+pub const DecompressError = error{
     LzoUnavailable,
     Lz4Unavailable,
 };

src/table.zig

@@ -1,6 +1,6 @@
 const std = @import("std");
 
-const TableError = error{
+pub const TableError = error{
     InvalidIndex,
 };