Revert changes to fullreader

Author: CalebQ42

internal/data/fullreader.go

@@ -2,7 +2,6 @@ package data
 
 import (
 	"io"
-	"sync"
 
 	"github.com/CalebQ42/squashfs/internal/decompress"
 	"github.com/CalebQ42/squashfs/internal/toreader"
@@ -27,9 +26,9 @@ func NewFullReader(r io.ReaderAt, start uint64, d decompress.Decompressor, block
 	}
 }
 
-func (r *FullReader) AddFragment(rdr func() (io.Reader, error), size uint32) {
+func (r *FullReader) AddFragment(rdr func() (io.Reader, error)) {
 	r.fragRdr = rdr
-	r.sizes = append(r.sizes, size)
+	r.sizes = append(r.sizes, 0)
 }
 
 type outDat struct {
@@ -38,50 +37,49 @@ type outDat struct {
 	i    int
 }
 
-func (r FullReader) process(index int, offset int64, od *outDat, out chan *outDat) {
-	defer func() {
-		out <- od
-	}()
-	od.i = index
+func (r FullReader) process(index int, offset int64, out chan outDat) {
+	var err error
+	var dat []byte
+	var rdr io.ReadCloser
 	size := realSize(r.sizes[index])
 	if size == 0 {
-		od.err = nil
-		od.data = make([]byte, r.blockSize)
+		out <- outDat{
+			i:    index,
+			err:  nil,
+			data: make([]byte, r.blockSize),
+		}
 		return
 	}
+	// rdr := io.LimitReader(toreader.NewReader(r.r, offset), int64(size))
 	if size == r.sizes[index] {
 		if dec, ok := r.d.(decompress.Decoder); ok {
-			dat := make([]byte, size)
-			_, od.err = r.r.ReadAt(dat, offset)
-			if od.err != nil {
-				return
+			dat = make([]byte, size)
+			_, err = r.r.ReadAt(dat, offset)
+			if err == nil {
+				dat, err = dec.Decode(dat, int(r.blockSize))
+			}
+		} else {
+			rdr, err = r.d.Reader(io.LimitReader(toreader.NewReader(r.r, offset), int64(size)))
+			if err == nil {
+				dat, err = io.ReadAll(rdr)
 			}
-			od.data, od.err = dec.Decode(dat, int(r.blockSize))
-			return
-		}
-		var rdr io.ReadCloser
-		rdr, od.err = r.d.Reader(io.LimitReader(toreader.NewReader(r.r, offset), int64(size)))
-		if od.err != nil {
-			return
 		}
-		od.data = make([]byte, r.blockSize)
-		var read int
-		read, od.err = rdr.Read(od.data)
-		od.data = od.data[:read]
-		rdr.Close()
 	} else {
-		od.data = make([]byte, size)
-		_, od.err = r.r.ReadAt(od.data, offset)
+		dat = make([]byte, size)
+		_, err = r.r.ReadAt(dat, offset)
+	}
+	out <- outDat{
+		i:    index,
+		err:  err,
+		data: dat,
+	}
+	if clr, ok := rdr.(io.Closer); ok {
+		clr.Close()
 	}
 }
 
 func (r FullReader) ReadAt(p []byte, off int64) (n int, err error) {
-	pol := &sync.Pool{
-		New: func() any {
-			return new(outDat)
-		},
-	}
-	out := make(chan *outDat, len(r.sizes))
+	out := make(chan outDat, len(r.sizes))
 	offset := r.start
 	num := len(r.sizes)
 	start := off / int64(r.blockSize)
@@ -101,42 +99,40 @@ func (r FullReader) ReadAt(p []byte, off int64) (n int, err error) {
 			offset += uint64(realSize(r.sizes[i]))
 			continue
 		}
-		od := pol.Get().(*outDat)
 		if i == num-1 && r.fragRdr != nil {
 			go func() {
-				defer func() {
-					out <- od
-				}()
 				rdr, e := r.fragRdr()
 				if err != nil {
-					od.i = num - 1
-					od.err = e
+					out <- outDat{
+						i:   num - 1,
+						err: e,
+					}
 					return
 				}
-				od.data = make([]byte, r.sizes[num-1])
-				_, e = rdr.Read(od.data)
-				od.i = num - 1
-				od.err = e
+				dat, e := io.ReadAll(rdr)
+				out <- outDat{
+					i:    num - 1,
+					err:  e,
+					data: dat,
+				}
 				if clr, ok := rdr.(io.Closer); ok {
 					clr.Close()
 				}
 			}()
 			continue
 		}
-		go r.process(i, int64(offset), od, out)
+		go r.process(i, int64(offset), out)
 		offset += uint64(realSize(r.sizes[i]))
 	}
-	cur := start
 	cache := make(map[int]outDat)
-	for dat := range out {
+	for cur := start; cur < int64(end); {
+		dat := <-out
 		if dat.err != nil {
 			err = dat.err
-			pol.Put(dat)
 			return
 		}
 		if dat.i != int(cur) {
-			cache[dat.i] = *dat
-			pol.Put(dat)
+			cache[dat.i] = dat
 			continue
 		}
 		if cur == start {
@@ -147,18 +143,16 @@ func (r FullReader) ReadAt(p []byte, off int64) (n int, err error) {
 		}
 		n += len(dat.data)
 		cur++
-		pol.Put(dat)
 		var ok bool
-		var curDat outDat
 		for {
-			curDat, ok = cache[int(cur)]
+			dat, ok = cache[int(cur)]
 			if !ok {
 				break
 			}
-			for i := range curDat.data {
-				p[n+i] = curDat.data[i]
+			for i := range dat.data {
+				p[n+i] = dat.data[i]
 			}
-			n += len(curDat.data)
+			n += len(dat.data)
 			cur++
 			delete(cache, int(cur))
 		}
@@ -170,94 +164,65 @@ func (r FullReader) ReadAt(p []byte, off int64) (n int, err error) {
 }
 
 func (r FullReader) WriteTo(w io.Writer) (n int64, err error) {
-	pol := &sync.Pool{
-		New: func() any {
-			return new(outDat)
-		},
-	}
-	out := make(chan *outDat, len(r.sizes))
+	out := make(chan outDat, len(r.sizes))
 	offset := r.start
 	num := len(r.sizes)
 	for i := 0; i < num; i++ {
-		od := pol.Get().(*outDat)
 		if i == num-1 && r.fragRdr != nil {
 			go func() {
-				defer func() {
-					out <- od
-				}()
 				rdr, e := r.fragRdr()
 				if err != nil {
-					od.i = num - 1
-					od.err = e
+					out <- outDat{
+						i:   num - 1,
+						err: e,
+					}
 					return
 				}
-				buf := make([]byte, r.sizes[num-1])
-				_, e = rdr.Read(buf)
-				od.i = num - 1
-				od.err = e
-				od.data = buf
+				dat, e := io.ReadAll(rdr)
+				out <- outDat{
+					i:    num - 1,
+					err:  e,
+					data: dat,
+				}
 				if clr, ok := rdr.(io.Closer); ok {
 					clr.Close()
 				}
 			}()
 			continue
 		}
-		go r.process(i, int64(offset), od, out)
+		go r.process(i, int64(offset), out)
 		offset += uint64(realSize(r.sizes[i]))
 	}
-	wt, ok := w.(io.WriterAt)
-	if !ok {
-		var cur int
-		cache := make(map[int]outDat)
-		var tmpN int
-		var dat *outDat
-		for cur < len(r.sizes) {
-			dat = <-out
-			defer pol.Put(dat)
-			if dat.err != nil {
-				err = dat.err
-				return
-			}
-			if dat.i != cur {
-				cache[dat.i] = *dat
-				continue
+	cache := make(map[int]outDat)
+	var tmpN int
+	for cur := 0; cur < num; {
+		dat := <-out
+		if dat.err != nil {
+			err = dat.err
+			return
+		}
+		if dat.i != cur {
+			cache[dat.i] = dat
+			continue
+		}
+		tmpN, err = w.Write(dat.data)
+		n += int64(tmpN)
+		if err != nil {
+			return
+		}
+		cur++
+		var ok bool
+		for {
+			dat, ok = cache[cur]
+			if !ok {
+				break
 			}
 			tmpN, err = w.Write(dat.data)
 			n += int64(tmpN)
 			if err != nil {
 				return
 			}
 			cur++
-			var ok bool
-			var curDat outDat
-			for {
-				curDat, ok = cache[cur]
-				if !ok {
-					break
-				}
-				tmpN, err = w.Write(curDat.data)
-				n += int64(tmpN)
-				if err != nil {
-					return
-				}
-				cur++
-			}
-		}
-	} else {
-		var done int
-		var dat *outDat
-		for done < len(r.sizes) {
-			dat = <-out
-			defer pol.Put(dat)
-			if dat.err != nil {
-				err = dat.err
-				return
-			}
-			_, err = wt.WriteAt(dat.data, int64(dat.i*int(r.blockSize)))
-			if err != nil {
-				return
-			}
-			done++
 		}
 	}
 	return

reader_inode.go

@@ -70,7 +70,7 @@ func (r Reader) getReaders(i inode.Inode) (full *data.FullReader, rdr *data.Read
 			}
 			fragRdr = io.LimitReader(fragRdr, int64(fragSize))
 			return fragRdr, nil
-		}, fragSize)
+		})
 		var fragRdr io.Reader
 		fragRdr, err = r.fragReader(fragInd)
 		if err != nil {