Extraction Finished-ish

src/archive.zig

@@ -119,8 +119,8 @@ pub fn root(self: *Archive) !SfsFile {
     var rdr = try self.fil.readerAt(self.super.root_ref.block_start + self.super.inode_start, &[0]u8{});
     var meta: MetadataReader = .init(self.allocator(), &rdr.interface, &self.decomp);
     try meta.interface.discardAll(self.super.root_ref.block_offset);
-    const inode: Inode = try .read(self.allocator(), &meta.interface, self.super.block_size);
+    const in: Inode = try .read(self.allocator(), &meta.interface, self.super.block_size);
-    return .init(self, inode, "");
+    return .init(self, in, "");
 }
 
 pub fn open(self: *Archive, path: []const u8) !SfsFile {

src/file.zig

@@ -7,6 +7,8 @@ const Archive = @import("archive.zig");
 const DirEntry = @import("dir_entry.zig");
 const ExtractionOptions = @import("options.zig");
 const Inode = @import("inode.zig");
+const BlockSize = @import("inode_data/file.zig").BlockSize;
+const DataReader = @import("util/data.zig");
 const MetadataReader = @import("util/metadata.zig");
 
 const FileError = error{
@@ -15,7 +17,7 @@ const FileError = error{
     NotSymlink,
     NotDevice,
     NotFound,
-    InvalidExtractionPath,
+    ExtractionPathExists,
 };
 
 const SfsFile = @This();
@@ -88,6 +90,44 @@ pub fn permissions(self: SfsFile) u16 {
     return self.inode.hdr.permissions;
 }
 
+pub fn isRegular(self: SfsFile) bool {
+    return switch (self.inode.hdr.inode_type) {
+        .file, .ext_file => true,
+        else => false,
+    };
+}
+/// The returned DataReader will no longer work if the File's deinit function is called
+/// or, more specifically, it's inode's deinit function is called.
+pub fn dataReader(self: SfsFile) !DataReader {
+    if (!self.isRegular()) return FileError.NotRegularFile;
+    var frag_idx: u32 = undefined;
+    var frag_offset: u32 = undefined;
+    var size: u64 = undefined;
+    var blocks: []BlockSize = undefined;
+    var start: u64 = undefined;
+    switch (self.inode.data) {
+        .file => |f| {
+            frag_idx = f.frag_idx;
+            frag_offset = f.frag_block_offset;
+            size = f.size;
+            blocks = f.block_sizes;
+            start = f.block_start;
+        },
+        .ext_file => |f| {
+            frag_idx = f.frag_idx;
+            frag_offset = f.frag_block_offset;
+            size = f.size;
+            blocks = f.block_sizes;
+            start = f.block_start;
+        },
+        else => unreachable,
+    }
+    var out: DataReader = .init(self.archive, blocks, start, size);
+    if (frag_idx != 0xFFFFFFFF)
+        out.addFragment(try self.archive.frag(frag_idx), frag_offset);
+    return out;
+}
+
 pub fn isDir(self: SfsFile) bool {
     return switch (self.inode.hdr.inode_type) {
         .dir, .ext_dir => true,
@@ -101,7 +141,7 @@ pub fn iterate(self: SfsFile) !Iterator {
         .archive = self.archive,
     };
 }
-/// Open a file/folder within a directory at the given path.
+/// Open a sub-file/folder within a directory at the given path.
 /// If path is ".", "/", or "./", this File is returned.
 pub fn open(self: SfsFile, path: []const u8) !SfsFile {
     if (!self.isDir()) return FileError.NotDirectory;
@@ -142,7 +182,7 @@ pub fn isSymlink(self: SfsFile) bool {
     };
 }
 pub fn symlinkPath(self: SfsFile) ![]const u8 {
-    if (!self.isSymlink()) FileError.NotSymlink;
+    if (!self.isSymlink()) return FileError.NotSymlink;
     return switch (self.inode.data) {
         .symlink => |s| s.target,
         .ext_symlink => |s| s.target,
@@ -170,9 +210,6 @@ pub fn dev(self: SfsFile) !u32 {
 /// Extract the given File to the path. If File is a regular file, the path must be a directory or not exist.
 /// If the gievn path is a folder, the File's contents will be extracted within.
 pub fn extract(self: *SfsFile, path: []const u8, options: ExtractionOptions) !void {
-    std.Options = .{
-        .log_level = options.log_level,
-    };
     var alloc = self.archive.allocator();
     var ext_path: []u8 = undefined;
     if (std.fs.cwd().statFile(path)) |stat| {
@@ -183,24 +220,24 @@ pub fn extract(self: *SfsFile, path: []const u8, options: ExtractionOptions) !vo
                     path.len + self.name.len
                 else
                     path.len + self.name.len + 1;
-                ext_path = alloc.alloc(u8, alloc_size);
+                ext_path = try alloc.alloc(u8, alloc_size);
                 @memcpy(ext_path[0..path.len], path);
                 @memcpy(ext_path[ext_path.len - self.name.len ..], self.name);
                 if (!has_end_sep) ext_path[path.len] = '/';
             } else {
-                ext_path = path;
+                ext_path = @constCast(path);
             }
-        } else return FileError.InvalidExtractionPath;
+        } else return FileError.ExtractionPathExists;
     } else |err| {
-        if (err == .FileNotFound) {
+        if (err == error.FileNotFound) {
-            ext_path = path;
+            ext_path = @constCast(path);
         } else {
             std.log.err("Error stat-ing extraction path {s}: {}\n", .{ path, err });
             return err;
         }
     }
     defer if (ext_path.len > path.len) alloc.free(ext_path);
-    var pool: std.Thread.Pool = .{};
+    var pool: std.Thread.Pool = undefined;
     try pool.init(.{ .allocator = alloc });
     var wg: WaitGroup = .{};
     defer pool.deinit();
@@ -220,16 +257,15 @@ const ParentInfo = struct {
     options: ExtractionOptions,
     err: *?anyerror,
 
-    fn finish(self: *ParentInfo) void {
+    fn finish(self: *const ParentInfo) void {
-        {
         self.mut.lock();
-            defer self.mut.unlock();
-            self.dir_wg.finish();
         if (!self.dir_wg.isDone()) {
+            self.mut.unlock();
             return;
         }
-        }
+        self.mut.unlock();
         self.sfs_fil.archive.allocator().destroy(self.mut);
+        self.sfs_fil.archive.allocator().destroy(self.dir_wg);
         defer self.parent_wg.finish();
         var fil = std.fs.cwd().openFile(self.path, .{}) catch |err| {
             std.log.err("Error opening folder {s} to set permissions: {}\n", .{ self.path, err });
@@ -267,33 +303,110 @@ fn extractReal(self: SfsFile, path: []const u8, options: ExtractionOptions, pol:
                 return;
             };
             defer fil.close();
-            //TODO:
+            var dat_rdr = self.dataReader() catch |err| {
+                std.log.err("Error getting data reader for {s} (inode {}): {}\n", .{ self.name, self.inode.hdr.num, err });
+                out_err.* = err;
+                return;
+            };
+            defer dat_rdr.deinit();
+            var wrt = fil.writer(&[0]u8{});
+            _ = dat_rdr.interface.streamRemaining(&wrt.interface) catch |err| {
+                std.log.err("Error writing data for {s} (inode {}) to {s}: {}\n", .{ self.name, self.inode.hdr.num, path, err });
+                out_err.* = wrt.err orelse err;
+                return;
+            };
+            wrt.interface.flush() catch |err| {
+                std.log.err("Error flushing data for {s} (inode {}) to {s}: {}\n", .{ self.name, self.inode.hdr.num, path, err });
+                out_err.* = wrt.err orelse err;
+                return;
+            };
             self.setPerm(fil, options) catch |err| {
-                std.log.err("Error setting permissions for {s}: {}\n", .{ path, err });
+                std.log.err("Error setting permissions/owner for {s}: {}\n", .{ path, err });
                 out_err.* = err;
                 return;
             };
         },
-        .symlink, .ext_symlink => {},
+        .symlink, .ext_symlink => {
+            //TODO: deal with dereference symlink options
+            const target_path = self.symlinkPath() catch |err| {
+                std.log.err("Error getting symlink target path for {s} (inode {}): {}\n", .{ self.name, self.inode.hdr.num, err });
+                out_err.* = err;
+                return;
+            };
+            std.fs.cwd().symLink(target_path, path, .{}) catch |err| {
+                std.log.err("Error creating {s}: {}\n", .{ path, err });
+                out_err.* = err;
+                return;
+            };
+            // self.setPerm(fil, options) catch |err| {
+            //     std.log.err("Error setting permissions/owner for {s}: {}\n", .{ path, err });
+            //     out_err.* = err;
+            //     return;
+            // };
+        },
         .block_dev,
         .char_dev,
         .fifo,
         .ext_block_dev,
         .ext_char_dev,
         .ext_fifo,
-        => {},
+        => {
+            var mode: u32 = undefined;
+            var fil_dev: u32 = 0;
+            switch (self.inode.hdr.inode_type) {
+                .block_dev, .ext_block_dev => {
+                    mode = std.posix.DT.BLK;
+                    fil_dev = self.dev() catch |err| {
+                        std.log.err("Error getting device number for {s} (inode {}): {}\n", .{ self.name, self.inode.hdr.num, err });
+                        out_err.* = err;
+                        return;
+                    };
+                },
+                .char_dev, .ext_char_dev => {
+                    mode = std.posix.DT.CHR;
+                    fil_dev = self.dev() catch |err| {
+                        std.log.err("Error getting device number for {s} (inode {}): {}\n", .{ self.name, self.inode.hdr.num, err });
+                        out_err.* = err;
+                        return;
+                    };
+                },
+                else => mode = std.posix.DT.FIFO,
+            }
+            const res = std.os.linux.mknod(@ptrCast(path), mode, fil_dev);
+            if (res != 0) {
+                std.log.err("Error creating device file at {s} with code {}\n", .{ path, res });
+                out_err.* = error.MknodError;
+                return;
+            }
+            const fil = std.fs.cwd().openFile(path, .{}) catch |err| {
+                std.log.err("Error openning {s} to set permissions: {}\n", .{ path, err });
+                out_err.* = err;
+                return;
+            };
+            defer fil.close();
+            self.setPerm(fil, options) catch |err| {
+                std.log.err("Error setting permissions/owner for {s}: {}\n", .{ path, err });
+                out_err.* = err;
+                return;
+            };
+        },
         .dir, .ext_dir => {
             _ = std.fs.cwd().statFile(path) catch |err| {
-                if (err == .NotFound) {}
+                if (err == error.FileNotFound) {}
             };
             var dir_wg: *WaitGroup = self.archive.allocator().create(WaitGroup) catch |err| {
-                std.log.err("Error allocating mutex for {s} (inode {}): {}\n", .{ path, self.inode.hdr.num, err });
+                std.log.err("Error allocating waitgroup for {s} (inode {}): {}\n", .{ path, self.inode.hdr.num, err });
                 out_err.* = err;
                 return;
             };
             const parent_info: ParentInfo = .{
-                .fil = self,
+                .sfs_fil = self,
                 .path = path,
+                .mut = self.archive.allocator().create(Mutex) catch |err| {
+                    std.log.err("Error allocating mutex for {s} (inode {}): {}\n", .{ path, self.inode.hdr.num, err });
+                    out_err.* = err;
+                    return;
+                },
                 .dir_wg = dir_wg,
                 .parent_wg = wg,
                 .options = options,
@@ -313,9 +426,9 @@ fn extractReal(self: SfsFile, path: []const u8, options: ExtractionOptions, pol:
                     break;
                 };
                 if (iter_fil == null) break;
-                var fil = iter_fil.?;
+                const fil = iter_fil.?;
                 dir_wg.start();
-                const path_len = path.len + fil.name.len;
+                var path_len = path.len + fil.name.len;
                 if (!path_has_end_sep) path_len += 1;
                 var new_path = self.archive.allocator().alloc(u8, path_len) catch |err| {
                     std.log.err("Error allocating subpath for {s} (inode {}): {}\n", .{ path, self.inode.hdr.num, err });
@@ -324,7 +437,7 @@ fn extractReal(self: SfsFile, path: []const u8, options: ExtractionOptions, pol:
                     break;
                 };
                 @memcpy(new_path[0..path.len], path);
-                @memcpy(new_path[new_path.len - fil.name.len ..], fil.name.len);
+                @memcpy(new_path[new_path.len - fil.name.len ..], fil.name);
                 if (!path_has_end_sep) new_path[path.len] = '/';
                 pol.spawn(extractReal, .{
                     fil,
@@ -340,7 +453,6 @@ fn extractReal(self: SfsFile, path: []const u8, options: ExtractionOptions, pol:
                     dir_wg.finish();
                     break;
                 };
-                fil.extractReal;
             }
         },
         .socket, .ext_socket => {

src/inode_data/file.zig

@@ -16,7 +16,7 @@ pub const File = struct {
 
     pub fn read(alloc: std.mem.Allocator, rdr: *Reader, block_size: u32) !File {
         var start: [16]u8 = undefined;
-        try rdr.readSliceAll(u8, &start, .little);
+        try rdr.readSliceAll(&start);
         const frag_idx: u32 = std.mem.readInt(u32, start[4..8], .little);
         const size: u32 = std.mem.readInt(u32, start[12..16], .little);
         var num_blocks: u32 = size / block_size;
@@ -50,7 +50,7 @@ pub const ExtFile = struct {
 
     pub fn read(alloc: std.mem.Allocator, rdr: *Reader, block_size: u32) !ExtFile {
         var start: [40]u8 = undefined;
-        try rdr.readSliceAll(u8, &start, .little);
+        try rdr.readSliceAll(&start);
         const frag_idx: u32 = std.mem.readInt(u32, start[28..32], .little);
         const size: u64 = std.mem.readInt(u64, start[8..16], .little);
         var num_blocks: u32 = @truncate(size / block_size);

src/inode_data/misc.zig

@@ -7,7 +7,7 @@ pub const Symlink = struct {
 
     pub fn read(alloc: std.mem.Allocator, rdr: *Reader) !Symlink {
         var start: [8]u8 = undefined;
-        try rdr.readSliceAll(u8, &start, .little);
+        try rdr.readSliceAll(&start);
         const target_size = std.mem.readInt(u32, start[4..8], .little);
         const target = try alloc.alloc(u8, target_size + 1);
         errdefer alloc.free(target);
@@ -30,7 +30,7 @@ pub const ExtSymlink = struct {
 
     pub fn read(alloc: std.mem.Allocator, rdr: *Reader) !ExtSymlink {
         var start: [8]u8 = undefined;
-        try rdr.readSliceAll(u8, &start, .little);
+        try rdr.readSliceAll(&start);
         const target_size = std.mem.readInt(u32, start[4..8], .little);
         const target = try alloc.alloc(u8, target_size + 1);
         errdefer alloc.free(target);

src/options.zig

@@ -15,4 +15,4 @@ log_level: std.log.Level = .err,
 // verboseWriter: ?*Writer = null,
 
 pub const Default: ExtractionOptions = .{};
-pub const VerboseDefault: ExtractionOptions = .{ .verbose = true };
+pub const VerboseDefault: ExtractionOptions = .{ .log_level = .debug };

src/table.zig

@@ -62,12 +62,12 @@ pub fn Table(T: anytype) type {
             }
             const is_last = (self.values - 1) / VALS_PER_BLOCK == block_num;
             const slice_size = if (is_last) self.values - (block_num * VALS_PER_BLOCK) else VALS_PER_BLOCK;
-            const slice = try self.alloc.alloc(slice_size);
+            const slice = try self.alloc.alloc(T, slice_size);
             var rdr = try self.fil.readerAt(self.tab_start + (8 * block_num), &[0]u8{});
-            const offset: u64 = 0;
+            var offset: u64 = 0;
-            try rdr.interface.readSliceEndian(u64, @ptrCast(&idx_offset), .little);
+            try rdr.interface.readSliceEndian(u64, @ptrCast(&offset), .little);
             rdr = try self.fil.readerAt(offset, &[0]u8{});
-            var meta: MetadataReader = .init(&rdr.interface, self.decomp);
+            var meta: MetadataReader = .init(self.alloc, &rdr.interface, self.decomp);
             try meta.interface.readSliceEndian(T, @ptrCast(slice), .little);
             try self.tab.put(block_num, slice);
             return slice[idx_offset];

src/util/data.zig

@@ -18,7 +18,7 @@ block_size: u32,
 
 blocks: []BlockSize,
 
-frag: ?FragEntry, // TODO: do something better?
+frag: ?FragEntry = null, // TODO: do something better?
 frag_offset: u32 = 0,
 size: u64,
 
@@ -49,7 +49,9 @@ pub fn init(archive: *Archive, blocks: []BlockSize, start: u64, size: u64) DataR
     };
 }
 pub fn deinit(self: *DataReader) void {
-    self.alloc.free(self.inteface.buffer);
+    self.alloc.free(self.interface.buffer);
+    self.interface.end = 0;
+    self.interface.seek = 0;
 }
 
 pub fn addFragment(self: *DataReader, entry: FragEntry, frag_offset: u32) void {
@@ -57,21 +59,29 @@ pub fn addFragment(self: *DataReader, entry: FragEntry, frag_offset: u32) void {
     self.frag_offset = frag_offset;
 }
 
-fn blockNum(self: DataReader) u32 {
+fn numBlocks(self: DataReader) usize {
     var res = self.blocks.len;
     if (self.frag != null) res += 1;
     return res;
 }
 
 fn advance(self: *DataReader) !void {
-    if (self.block_idx > self.blocks.len or (self.block_idx == self.blocks.len and self.frag == null)) return Reader.Error.EndOfStream;
+    if (self.block_idx > self.blocks.len or (self.block_idx == self.blocks.len and self.frag == null)) {
-    defer self.block_idx += 1;
+        if (self.interface.buffer.len > 0) {
-    self.interface.seek = 0;
             self.alloc.free(self.interface.buffer);
+            self.interface.buffer = &[0]u8{};
+            self.interface.end = 0;
+            self.interface.seek = 0;
+        }
+        return Reader.Error.EndOfStream;
+    }
+    defer self.block_idx += 1;
+    const cur_block_size = if (self.block_idx == self.numBlocks() - 1) self.size % self.block_size else self.block_size;
+    try self.resizeBuffer(cur_block_size);
+    self.interface.seek = 0;
+    self.interface.end = cur_block_size;
     if (self.block_idx == self.blocks.len) { // fragment
-        var rdr = try self.fil.readerAt(self.frag.?.start + self.frag_offset, &[0]u8);
+        var rdr = try self.fil.readerAt(self.frag.?.start, &[0]u8{});
-        self.interface.buffer = try rdr.interface.readAlloc(self.alloc, self.size % self.block_size);
-        self.interface.end = self.interface.buffer.len;
         if (self.frag.?.size.uncompressed) {
             try rdr.interface.discardAll(self.frag_offset);
             try rdr.interface.readSliceAll(self.interface.buffer);
@@ -79,30 +89,45 @@ fn advance(self: *DataReader) !void {
         }
         const tmp_buf = try self.alloc.alloc(u8, self.frag.?.size.size);
         defer self.alloc.free(tmp_buf);
-        var limit_rdr = Reader.limited(&rdr.interface, self.frag.?.size.size, tmp_buf);
+        var limit_rdr = Reader.limited(&rdr.interface, @enumFromInt(self.frag.?.size.size), tmp_buf);
-        const needed_block = try self.alloc.alloc(u8, self.frag_offset + self.interface.buffer.len);
+        const needed_block = try self.alloc.alloc(u8, self.frag_offset + cur_block_size);
         defer self.alloc.free(needed_block);
         _ = try self.decomp.decompReader(&limit_rdr.interface, needed_block);
         @memcpy(self.interface.buffer, needed_block[self.frag_offset..]);
         return;
     }
-    const cur_block_size = if (self.block_idx == self.blockNum() - 1) self.size % self.block_size else self.block_size;
     const block = self.blocks[self.block_idx];
-    var rdr = try self.fil.readerAt(self.cur_offset, &[0]u8);
+    if (block.size == 0) {
-    self.interface.end = cur_block_size;
+        @memset(self.interface.buffer, 0);
-    if (block.uncompressed) {
-        self.interface.buffer = try rdr.interface.readAlloc(self.alloc, cur_block_size);
         return;
     }
-    var buf: [8192]u8 = undefined;
+    var rdr = try self.fil.readerAt(self.cur_offset, &[0]u8{});
-    var limit_rdr = Reader.limited(&rdr.interface, block.size, &buf);
+    if (block.uncompressed) {
+        try rdr.interface.readSliceAll(self.interface.buffer);
+        return;
+    }
+    var buf: [8192]u8 = undefined; //TODO: possibly change for better performance/memory usage. Might need to be a full block in size.
+    var limit_rdr = Reader.limited(&rdr.interface, @enumFromInt(block.size), &buf);
     _ = try self.decomp.decompReader(&limit_rdr.interface, self.interface.buffer);
 }
+/// Does not guarentee that data currently in the buffer is retained.
+fn resizeBuffer(self: *DataReader, size: usize) !void {
+    if (self.interface.buffer.len == size) return;
+    if (!self.alloc.resize(self.interface.buffer, size)) {
+        self.alloc.free(self.interface.buffer);
+        self.interface.buffer = self.alloc.alloc(u8, size) catch |err| {
+            self.interface.buffer = &[0]u8{};
+            return err;
+        };
+    } else {
+        self.interface.buffer.len = size;
+    }
+}
 
 fn stream(rdr: *Reader, wrt: *Writer, limit: Limit) Reader.StreamError!usize {
-    var self: *DataReader = @fieldParentPtr("interface", rdr);
+    var self: *DataReader = @alignCast(@fieldParentPtr("interface", rdr));
     if (rdr.seek >= rdr.end) self.advance() catch |err| {
-        if (err == .EndOfStream) return err;
+        if (err == error.EndOfStream) return error.EndOfStream;
         std.log.err("Error advancing data reader: {}\n", .{err});
         return Reader.Error.ReadFailed;
     };
@@ -114,9 +139,9 @@ fn stream(rdr: *Reader, wrt: *Writer, limit: Limit) Reader.StreamError!usize {
 }
 
 fn discard(rdr: *Reader, limit: Limit) Reader.Error!usize {
-    var self: *DataReader = @fieldParentPtr("interface", rdr);
+    var self: *DataReader = @alignCast(@fieldParentPtr("interface", rdr));
     if (rdr.seek >= rdr.end) self.advance() catch |err| {
-        if (err == .EndOfStream) return err;
+        if (err == error.EndOfStream) return error.EndOfStream;
         std.log.err("Error advancing data reader: {}\n", .{err});
         return Reader.Error.ReadFailed;
     };
@@ -127,16 +152,16 @@ fn discard(rdr: *Reader, limit: Limit) Reader.Error!usize {
 }
 
 fn readVec(rdr: *Reader, vec: [][]u8) Reader.Error!usize {
-    var self: *DataReader = @fieldParentPtr("interface", rdr);
+    var self: *DataReader = @alignCast(@fieldParentPtr("interface", rdr));
     if (rdr.seek >= rdr.end) self.advance() catch |err| {
-        if (err == .EndOfStream) return err;
+        if (err == error.EndOfStream) return error.EndOfStream;
         std.log.err("Error advancing data reader: {}\n", .{err});
         return Reader.Error.ReadFailed;
     };
     var cur_red: usize = 0;
     for (vec) |s| {
         const to_copy: usize = @min(rdr.end - rdr.seek, s.len);
-        @memcpy(s[0..to_copy], self.buf[rdr.seek .. rdr.seek + to_copy]);
+        @memcpy(s[0..to_copy], rdr.buffer[rdr.seek .. rdr.seek + to_copy]);
         rdr.seek += to_copy;
         cur_red += to_copy;
         if (rdr.end == rdr.seek) break;