Finishing touches

Added FastOptions as an alternative to DefaultOptions
A few performance improvements
A few bug fixes

README.md

@@ -11,18 +11,27 @@ Currently has support for reading squashfs files and extracting files and folder
 Special thanks to <https://dr-emann.github.io/squashfs/> for some VERY important information in an easy to understand format.
 Thanks also to [distri's squashfs library](https://github.com/distr1/distri/tree/master/internal/squashfs) as I referenced it to figure some things out (and double check others).
 
+## FUSE
+
+As of `v1.0`, FUSE capabilities has been moved to [a separate library](https://github.com/CalebQ42/squashfuse).
+
 ## Limitations
 
-* No Xattr parsing. This is simply because I haven't done any research on it and how to apply these in a pure go way.
+* No Xattr parsing.
 * Socket files are not extracted.
-  * From my research, it seems like a socket file would be useless if it could be created. They are still exposed when fuse mounted.
+  * From my research, it seems like a socket file would be useless if it could be created.
 * Fifo files are ignored on `darwin`
 
 ## Issues
 
-* Significantly slower then `unsquashfs` when extracting folders (about 5 ~ 7 times slower on a ~100MB archive using zstd compression)
+* Significantly slower then `unsquashfs` when extracting folders
   * This seems to be related to above along with the general optimization of `unsquashfs` and it's compression libraries.
-  * The larger the file's tree, the slower the extraction will be. Arch Linux's Live USB's airootfs.sfs takes ~35x longer for a full extraction.
+  * Times seem to be largely dependent on file tree size and compression type.
+    * My main testing image (~100MB) using Zstd takes about 6x longer.
+    * An Arch Linux airootfs image (~780MB) using XZ compression with LZMA filters takes about 32x longer.
+    * A Tensorflow docker image (~3.3GB) using Zstd takes about 12x longer.
+
+Note: These numbers are using `FastOptions()`. `DefaultOptions()` takes about 2x longer.
 
 ## Recommendations on Usage
 

extraction_options.go

@@ -3,28 +3,47 @@ package squashfs
 import (
 	"io"
 	"io/fs"
-	"os"
+	"runtime"
 
 	"github.com/CalebQ42/squashfs/internal/routinemanager"
 )
 
 type ExtractionOptions struct {
 	manager            *routinemanager.Manager
-	LogOutput          io.Writer   //Where the verbose log should write. Defaults to os.Stdout.
+	LogOutput          io.Writer   //Where the verbose log should write.
 	DereferenceSymlink bool        //Replace symlinks with the target file.
 	UnbreakSymlink     bool        //Try to make sure symlinks remain unbroken when extracted, without changing the symlink.
 	Verbose            bool        //Prints extra info to log on an error.
 	IgnorePerm         bool        //Ignore file's permissions and instead use Perm.
 	Perm               fs.FileMode //Permission to use when IgnorePerm. Defaults to 0777.
-	SimultaneousFiles  uint16      //Number of files to process in parallel. Defaults to 10.
-	ExtractionRoutines uint16      //Number of goroutines to use for each file's extraction. Only applies to regular files. Defaults to 10.
+	SimultaneousFiles  uint16      //Number of files to process in parallel. Default set based on runtime.NumCPU().
+	ExtractionRoutines uint16      //Number of goroutines to use for each file's extraction. Only applies to regular files. Default set based on runtime.NumCPU().
 }
 
+// The default extraction options.
 func DefaultOptions() *ExtractionOptions {
+	cores := uint16(runtime.NumCPU() / 2)
+	var files, routines uint16
+	if cores <= 4 {
+		files = 1
+		routines = cores
+	} else {
+		files = cores - 4
+		routines = 4
+	}
+	return &ExtractionOptions{
+		Perm:               0777,
+		SimultaneousFiles:  files,
+		ExtractionRoutines: routines,
+	}
+}
+
+// Less limited default options. Can run up 2x faster than DefaultOptions.
+// Tends to use all available CPU resources.
+func FastOptions() *ExtractionOptions {
 	return &ExtractionOptions{
-		LogOutput:          os.Stdout,
 		Perm:               0777,
-		SimultaneousFiles:  10,
-		ExtractionRoutines: 10,
+		SimultaneousFiles:  uint16(runtime.NumCPU()),
+		ExtractionRoutines: uint16(runtime.NumCPU()),
 	}
 }

file.go

@@ -27,6 +27,15 @@ type File struct {
 	dirsRead int
 }
 
+// Creates a new *File from the given *squashfs.Base
+func (r *Reader) FileFromBase(b *squashfs.Base, parent *FS) *File {
+	return &File{
+		b:      b,
+		parent: parent,
+		r:      r,
+	}
+}
+
 func (f *File) FS() (*FS, error) {
 	if !f.IsDir() {
 		return nil, errors.New("not a directory")
@@ -179,6 +188,9 @@ func (f *File) deviceDevices() (maj uint32, min uint32) {
 }
 
 func (f *File) path() string {
+	if f.parent == nil {
+		return f.b.Name
+	}
 	return filepath.Join(f.parent.path(), f.b.Name)
 }
 
@@ -193,7 +205,16 @@ func (f *File) Extract(folder string) error {
 func (f *File) ExtractWithOptions(path string, op *ExtractionOptions) error {
 	if op.manager == nil {
 		op.manager = routinemanager.NewManager(op.SimultaneousFiles)
-		log.SetOutput(op.LogOutput)
+		if op.LogOutput != nil {
+			log.SetOutput(op.LogOutput)
+		}
+		err := os.MkdirAll(path, 0777)
+		if err != nil {
+			if op.Verbose {
+				log.Println("Failed to create initial directory", path)
+			}
+			return err
+		}
 	}
 	switch f.b.Inode.Type {
 	case inode.Dir, inode.EDir:
@@ -205,7 +226,6 @@ func (f *File) ExtractWithOptions(path string, op *ExtractionOptions) error {
 			return errors.Join(errors.New("failed to create squashfs.Directory: "+path), err)
 		}
 		errChan := make(chan error, len(d.Entries))
-		files := len(d.Entries)
 		for i := range d.Entries {
 			b, err := f.r.r.BaseFromEntry(d.Entries[i])
 			if err != nil {
@@ -214,37 +234,39 @@ func (f *File) ExtractWithOptions(path string, op *ExtractionOptions) error {
 				}
 				return errors.Join(errors.New("failed to get base from entry: "+path), err)
 			}
-			if b.IsDir() {
-				files--
-				extDir := filepath.Join(path, b.Name)
-				err = os.Mkdir(extDir, 0777)
-				if err != nil {
-					if op.Verbose {
-						log.Println("Failed to create directory", path)
+			go func(b *squashfs.Base, path string) {
+				i := op.manager.Lock()
+				if b.IsDir() {
+					extDir := filepath.Join(path, b.Name)
+					err = os.Mkdir(extDir, 0777)
+					op.manager.Unlock(i)
+					if err != nil {
+						if op.Verbose {
+							log.Println("Failed to create directory", path)
+						}
+						errChan <- errors.Join(errors.New("failed to create directory: "+path), err)
+						return
 					}
-					return errors.Join(errors.New("failed to create directory: "+path), err)
-				}
-				err = f.ExtractWithOptions(extDir, op)
-				if err != nil {
-					if op.Verbose {
-						log.Println("Failed to extract directory", path)
+					err = f.r.FileFromBase(b, f.r.FSFromDirectory(d, f.parent)).ExtractWithOptions(extDir, op)
+					if err != nil {
+						if op.Verbose {
+							log.Println("Failed to extract directory", path)
+						}
+						errChan <- errors.Join(errors.New("failed to extract directory: "+path), err)
+						return
 					}
-					return errors.Join(errors.New("failed to extract directory: "+path), err)
+					errChan <- nil
+				} else {
+					fil := f.r.FileFromBase(b, f.r.FSFromDirectory(d, f.parent))
+					err = fil.ExtractWithOptions(path, op)
+					op.manager.Unlock(i)
+					fil.Close()
+					errChan <- err
 				}
-			} else {
-				fil := &File{
-					b: b,
-					r: f.r,
-				}
-				go func(fil *File, folder string) {
-					i := op.manager.Lock()
-					defer op.manager.Unlock(i)
-					errChan <- fil.ExtractWithOptions(folder, op)
-				}(fil, path)
-			}
+			}(b, path)
 		}
 		var errCache []error
-		for i := 0; i < files; i++ {
+		for i := 0; i < len(d.Entries); i++ {
 			err := <-errChan
 			if err != nil {
 				errCache = append(errCache, err)
@@ -278,9 +300,6 @@ func (f *File) ExtractWithOptions(path string, op *ExtractionOptions) error {
 			}
 			return errors.Join(errors.New("failed to write file: "+path), err)
 		}
-		if op.Verbose {
-			log.Println(f.path(), "extracted to", path)
-		}
 	case inode.Sym, inode.ESym:
 		symPath := f.SymlinkPath()
 		if op.DereferenceSymlink {

fs.go

@@ -20,6 +20,15 @@ type FS struct {
 	parent *FS
 }
 
+// Creates a new *FS from the given squashfs.directory
+func (r *Reader) FSFromDirectory(d *squashfs.Directory, parent *FS) *FS {
+	return &FS{
+		d:      d,
+		r:      r,
+		parent: parent,
+	}
+}
+
 // Glob returns the name of the files at the given pattern.
 // All paths are relative to the FS.
 // Uses filepath.Match to compare names.
@@ -101,9 +110,9 @@ func (f *FS) Open(name string) (fs.File, error) {
 				Path: name,
 				Err:  fs.ErrNotExist,
 			}
+		} else {
+			return f.parent.Open(strings.Join(split[1:], "/"))
 		}
-	} else {
-		return f.parent.Open(strings.Join(split[1:], "/"))
 	}
 	i, found := slices.BinarySearchFunc(f.d.Entries, split[0], func(e directory.Entry, name string) int {
 		return strings.Compare(e.Name, name)
@@ -137,11 +146,7 @@ func (f *FS) Open(name string) (fs.File, error) {
 	if err != nil {
 		return nil, err
 	}
-	return (&FS{
-		d:      d,
-		r:      f.r,
-		parent: f,
-	}).Open(strings.Join(split[1:], "/"))
+	return f.r.FSFromDirectory(d, f).Open(strings.Join(split[1:], "/"))
 }
 
 // Returns all DirEntry's for the directory at name.

reader.go

@@ -17,12 +17,14 @@ func NewReader(r io.ReaderAt) (*Reader, error) {
 	if err != nil {
 		return nil, err
 	}
-	return &Reader{
+	out := &Reader{
 		r: rdr,
-		FS: &FS{
-			d: rdr.Root,
-		},
-	}, nil
+	}
+	out.FS = &FS{
+		d: rdr.Root,
+		r: out,
+	}
+	return out, nil
 }
 
 func (r *Reader) ModTime() time.Time {

squashfs/data/fullreader.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"io"
 	"math"
+	"runtime"
 	"sync"
 
 	"github.com/CalebQ42/squashfs/internal/decompress"
@@ -31,7 +32,7 @@ func NewFullReader(r io.ReaderAt, initialOffset int64, d decompress.Decompressor
 		d:              d,
 		sizes:          sizes,
 		initialOffset:  initialOffset,
-		goroutineLimit: 10,
+		goroutineLimit: uint16(runtime.NumCPU()),
 		finalBlockSize: finalBlockSize,
 		blockSize:      blockSize,
 		retPool: &sync.Pool{

squashfs/directory.go

@@ -2,7 +2,6 @@ package squashfs
 
 import (
 	"errors"
-	"fmt"
 	"io/fs"
 	"path/filepath"
 	"slices"
@@ -22,7 +21,6 @@ type Directory struct {
 func (r *Reader) directoryFromRef(ref uint64, name string) (*Directory, error) {
 	i, err := r.InodeFromRef(ref)
 	if err != nil {
-		fmt.Println("yo")
 		return nil, err
 	}
 	var blockStart uint32

squashfs/reader_test.go

@@ -1,4 +1,4 @@
-package squashfs
+package squashfs_test
 
 import (
 	"fmt"
@@ -8,6 +8,8 @@ import (
 	"os/exec"
 	"path/filepath"
 	"testing"
+
+	"github.com/CalebQ42/squashfs/squashfs"
 )
 
 const (
@@ -55,7 +57,7 @@ func TestReader(t *testing.T) {
 		t.Fatal(err)
 	}
 	defer fil.Close()
-	rdr, err := NewReader(fil)
+	rdr, err := squashfs.NewReader(fil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -75,7 +77,7 @@ func TestSingleFile(t *testing.T) {
 		t.Fatal(err)
 	}
 	defer fil.Close()
-	rdr, err := NewReader(fil)
+	rdr, err := squashfs.NewReader(fil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -90,7 +92,7 @@ func TestSingleFile(t *testing.T) {
 	t.Fatal(err)
 }
 
-func extractToDir(rdr *Reader, b *Base, folder string) error {
+func extractToDir(rdr *squashfs.Reader, b *squashfs.Base, folder string) error {
 	path := filepath.Join(folder, b.Name)
 	if b.IsDir() {
 		d, err := b.ToDir(rdr)
@@ -101,7 +103,7 @@ func extractToDir(rdr *Reader, b *Base, folder string) error {
 		if err != nil {
 			return err
 		}
-		var nestBast *Base
+		var nestBast *squashfs.Base
 		for _, e := range d.Entries {
 			nestBast, err = rdr.BaseFromEntry(e)
 			if err != nil {
@@ -115,7 +117,6 @@ func extractToDir(rdr *Reader, b *Base, folder string) error {
 	} else if b.IsRegular() {
 		_, full, err := b.GetRegFileReaders(rdr)
 		if err != nil {
-			fmt.Println("yo", path)
 			return err
 		}
 		fil, err := os.Create(path)