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-rw-r--r--plumbing/format/packfile/fsobject.go15
-rw-r--r--plumbing/format/packfile/packfile.go73
-rw-r--r--plumbing/format/packfile/patch_delta.go210
-rw-r--r--plumbing/format/packfile/scanner.go15
4 files changed, 0 insertions, 313 deletions
diff --git a/plumbing/format/packfile/fsobject.go b/plumbing/format/packfile/fsobject.go
index 4aa3c8e..c5edaf5 100644
--- a/plumbing/format/packfile/fsobject.go
+++ b/plumbing/format/packfile/fsobject.go
@@ -7,7 +7,6 @@ import (
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/cache"
"github.com/go-git/go-git/v5/plumbing/format/idxfile"
- "github.com/go-git/go-git/v5/utils/ioutil"
)
// FSObject is an object from the packfile on the filesystem.
@@ -64,20 +63,6 @@ func (o *FSObject) Reader() (io.ReadCloser, error) {
}
p := NewPackfileWithCache(o.index, nil, f, o.cache)
- if o.size > LargeObjectThreshold {
- // We have a big object
- h, err := p.objectHeaderAtOffset(o.offset)
- if err != nil {
- return nil, err
- }
-
- r, err := p.getReaderDirect(h)
- if err != nil {
- _ = f.Close()
- return nil, err
- }
- return ioutil.NewReadCloserWithCloser(r, f.Close), nil
- }
r, err := p.getObjectContent(o.offset)
if err != nil {
_ = f.Close()
diff --git a/plumbing/format/packfile/packfile.go b/plumbing/format/packfile/packfile.go
index 77861d2..ddd7f62 100644
--- a/plumbing/format/packfile/packfile.go
+++ b/plumbing/format/packfile/packfile.go
@@ -32,12 +32,6 @@ var (
// wrapped in FSObject.
const smallObjectThreshold = 16 * 1024
-// Conversely there are large objects that should not be cached and kept
-// in memory as they're too large to be reasonably cached. Objects larger
-// than this threshold are now always never read into memory to be stored
-// in the cache
-const LargeObjectThreshold = 1024 * 1024
-
// Packfile allows retrieving information from inside a packfile.
type Packfile struct {
idxfile.Index
@@ -288,37 +282,6 @@ func (p *Packfile) getObjectContent(offset int64) (io.ReadCloser, error) {
return obj.Reader()
}
-func (p *Packfile) getReaderDirect(h *ObjectHeader) (io.ReadCloser, error) {
- switch h.Type {
- case plumbing.CommitObject, plumbing.TreeObject, plumbing.BlobObject, plumbing.TagObject:
- return p.s.ReadObject()
- case plumbing.REFDeltaObject:
- deltaRC, err := p.s.ReadObject()
- if err != nil {
- return nil, err
- }
- r, err := p.readREFDeltaObjectContent(h, deltaRC)
- if err != nil {
- _ = deltaRC.Close()
- return nil, err
- }
- return r, nil
- case plumbing.OFSDeltaObject:
- deltaRC, err := p.s.ReadObject()
- if err != nil {
- return nil, err
- }
- r, err := p.readOFSDeltaObjectContent(h, deltaRC)
- if err != nil {
- _ = deltaRC.Close()
- return nil, err
- }
- return r, nil
- default:
- return nil, ErrInvalidObject.AddDetails("type %q", h.Type)
- }
-}
-
func (p *Packfile) getNextMemoryObject(h *ObjectHeader) (plumbing.EncodedObject, error) {
var obj = new(plumbing.MemoryObject)
obj.SetSize(h.Length)
@@ -371,20 +334,6 @@ func (p *Packfile) fillREFDeltaObjectContent(obj plumbing.EncodedObject, ref plu
return p.fillREFDeltaObjectContentWithBuffer(obj, ref, buf)
}
-func (p *Packfile) readREFDeltaObjectContent(h *ObjectHeader, deltaRC io.ReadCloser) (io.ReadCloser, error) {
- var err error
-
- base, ok := p.cacheGet(h.Reference)
- if !ok {
- base, err = p.Get(h.Reference)
- if err != nil {
- return nil, err
- }
- }
-
- return ReaderFromDelta(h, base, deltaRC)
-}
-
func (p *Packfile) fillREFDeltaObjectContentWithBuffer(obj plumbing.EncodedObject, ref plumbing.Hash, buf *bytes.Buffer) error {
var err error
@@ -415,28 +364,6 @@ func (p *Packfile) fillOFSDeltaObjectContent(obj plumbing.EncodedObject, offset
return p.fillOFSDeltaObjectContentWithBuffer(obj, offset, buf)
}
-func (p *Packfile) readOFSDeltaObjectContent(h *ObjectHeader, deltaRC io.ReadCloser) (io.ReadCloser, error) {
- hash, err := p.FindHash(h.OffsetReference)
- if err != nil {
- return nil, err
- }
-
- base, err := p.objectAtOffset(h.OffsetReference, hash)
- if err != nil {
- return nil, err
- }
-
- base, ok := p.cacheGet(h.Reference)
- if !ok {
- base, err = p.Get(h.Reference)
- if err != nil {
- return nil, err
- }
- }
-
- return ReaderFromDelta(h, base, deltaRC)
-}
-
func (p *Packfile) fillOFSDeltaObjectContentWithBuffer(obj plumbing.EncodedObject, offset int64, buf *bytes.Buffer) error {
hash, err := p.FindHash(offset)
if err != nil {
diff --git a/plumbing/format/packfile/patch_delta.go b/plumbing/format/packfile/patch_delta.go
index 76fef4a..9e90f30 100644
--- a/plumbing/format/packfile/patch_delta.go
+++ b/plumbing/format/packfile/patch_delta.go
@@ -1,11 +1,9 @@
package packfile
import (
- "bufio"
"bytes"
"errors"
"io"
- "math"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/utils/ioutil"
@@ -75,131 +73,6 @@ func PatchDelta(src, delta []byte) ([]byte, error) {
return b.Bytes(), nil
}
-func ReaderFromDelta(h *ObjectHeader, base plumbing.EncodedObject, deltaRC io.ReadCloser) (io.ReadCloser, error) {
- deltaBuf := bufio.NewReaderSize(deltaRC, 1024)
- srcSz, err := decodeLEB128ByteReader(deltaBuf)
- if err != nil {
- if err == io.EOF {
- return nil, ErrInvalidDelta
- }
- return nil, err
- }
- if srcSz != uint(base.Size()) {
- return nil, ErrInvalidDelta
- }
-
- targetSz, err := decodeLEB128ByteReader(deltaBuf)
- if err != nil {
- if err == io.EOF {
- return nil, ErrInvalidDelta
- }
- return nil, err
- }
- remainingTargetSz := targetSz
-
- dstRd, dstWr := io.Pipe()
-
- go func() {
- baseRd, err := base.Reader()
- if err != nil {
- _ = dstWr.CloseWithError(ErrInvalidDelta)
- return
- }
- defer baseRd.Close()
-
- baseBuf := bufio.NewReader(baseRd)
- basePos := uint(0)
-
- for {
- cmd, err := deltaBuf.ReadByte()
- if err == io.EOF {
- _ = dstWr.CloseWithError(ErrInvalidDelta)
- return
- }
- if err != nil {
- _ = dstWr.CloseWithError(err)
- return
- }
-
- if isCopyFromSrc(cmd) {
- offset, err := decodeOffsetByteReader(cmd, deltaBuf)
- if err != nil {
- _ = dstWr.CloseWithError(err)
- return
- }
- sz, err := decodeSizeByteReader(cmd, deltaBuf)
- if err != nil {
- _ = dstWr.CloseWithError(err)
- return
- }
-
- if invalidSize(sz, targetSz) ||
- invalidOffsetSize(offset, sz, srcSz) {
- _ = dstWr.Close()
- return
- }
-
- discard := offset - basePos
- if discard < 0 {
- _ = baseRd.Close()
- baseRd, err = base.Reader()
- if err != nil {
- _ = dstWr.CloseWithError(ErrInvalidDelta)
- return
- }
- baseBuf.Reset(baseRd)
- discard = offset
- }
- for discard > math.MaxInt32 {
- n, err := baseBuf.Discard(math.MaxInt32)
- if err != nil {
- _ = dstWr.CloseWithError(err)
- return
- }
- basePos += uint(n)
- discard -= uint(n)
- }
- for discard > 0 {
- n, err := baseBuf.Discard(int(discard))
- if err != nil {
- _ = dstWr.CloseWithError(err)
- return
- }
- basePos += uint(n)
- discard -= uint(n)
- }
- if _, err := io.Copy(dstWr, io.LimitReader(baseBuf, int64(sz))); err != nil {
- _ = dstWr.CloseWithError(err)
- return
- }
- remainingTargetSz -= sz
- basePos += sz
- } else if isCopyFromDelta(cmd) {
- sz := uint(cmd) // cmd is the size itself
- if invalidSize(sz, targetSz) {
- _ = dstWr.CloseWithError(ErrInvalidDelta)
- return
- }
- if _, err := io.Copy(dstWr, io.LimitReader(deltaBuf, int64(sz))); err != nil {
- _ = dstWr.CloseWithError(err)
- return
- }
-
- remainingTargetSz -= sz
- } else {
- _ = dstWr.CloseWithError(ErrDeltaCmd)
- return
- }
- if remainingTargetSz <= 0 {
- _ = dstWr.Close()
- return
- }
- }
- }()
-
- return dstRd, nil
-}
-
func patchDelta(dst *bytes.Buffer, src, delta []byte) error {
if len(delta) < deltaSizeMin {
return ErrInvalidDelta
@@ -288,25 +161,6 @@ func decodeLEB128(input []byte) (uint, []byte) {
return num, input[sz:]
}
-func decodeLEB128ByteReader(input io.ByteReader) (uint, error) {
- var num, sz uint
- for {
- b, err := input.ReadByte()
- if err != nil {
- return 0, err
- }
-
- num |= (uint(b) & payload) << (sz * 7) // concats 7 bits chunks
- sz++
-
- if uint(b)&continuation == 0 {
- break
- }
- }
-
- return num, nil
-}
-
const (
payload = 0x7f // 0111 1111
continuation = 0x80 // 1000 0000
@@ -320,40 +174,6 @@ func isCopyFromDelta(cmd byte) bool {
return (cmd&0x80) == 0 && cmd != 0
}
-func decodeOffsetByteReader(cmd byte, delta io.ByteReader) (uint, error) {
- var offset uint
- if (cmd & 0x01) != 0 {
- next, err := delta.ReadByte()
- if err != nil {
- return 0, err
- }
- offset = uint(next)
- }
- if (cmd & 0x02) != 0 {
- next, err := delta.ReadByte()
- if err != nil {
- return 0, err
- }
- offset |= uint(next) << 8
- }
- if (cmd & 0x04) != 0 {
- next, err := delta.ReadByte()
- if err != nil {
- return 0, err
- }
- offset |= uint(next) << 16
- }
- if (cmd & 0x08) != 0 {
- next, err := delta.ReadByte()
- if err != nil {
- return 0, err
- }
- offset |= uint(next) << 24
- }
-
- return offset, nil
-}
-
func decodeOffset(cmd byte, delta []byte) (uint, []byte, error) {
var offset uint
if (cmd & 0x01) != 0 {
@@ -388,36 +208,6 @@ func decodeOffset(cmd byte, delta []byte) (uint, []byte, error) {
return offset, delta, nil
}
-func decodeSizeByteReader(cmd byte, delta io.ByteReader) (uint, error) {
- var sz uint
- if (cmd & 0x10) != 0 {
- next, err := delta.ReadByte()
- if err != nil {
- return 0, err
- }
- sz = uint(next)
- }
- if (cmd & 0x20) != 0 {
- next, err := delta.ReadByte()
- if err != nil {
- return 0, err
- }
- sz |= uint(next) << 8
- }
- if (cmd & 0x40) != 0 {
- next, err := delta.ReadByte()
- if err != nil {
- return 0, err
- }
- sz |= uint(next) << 16
- }
- if sz == 0 {
- sz = 0x10000
- }
-
- return sz, nil
-}
-
func decodeSize(cmd byte, delta []byte) (uint, []byte, error) {
var sz uint
if (cmd & 0x10) != 0 {
diff --git a/plumbing/format/packfile/scanner.go b/plumbing/format/packfile/scanner.go
index 5d9e8fb..6e6a687 100644
--- a/plumbing/format/packfile/scanner.go
+++ b/plumbing/format/packfile/scanner.go
@@ -320,21 +320,6 @@ func (s *Scanner) NextObject(w io.Writer) (written int64, crc32 uint32, err erro
return
}
-// ReadObject returns a reader for the object content and an error
-func (s *Scanner) ReadObject() (io.ReadCloser, error) {
- s.pendingObject = nil
- zr := zlibReaderPool.Get().(io.ReadCloser)
-
- if err := zr.(zlib.Resetter).Reset(s.r, nil); err != nil {
- return nil, fmt.Errorf("zlib reset error: %s", err)
- }
-
- return ioutil.NewReadCloserWithCloser(zr, func() error {
- zlibReaderPool.Put(zr)
- return nil
- }), nil
-}
-
// ReadRegularObject reads and write a non-deltified object
// from it zlib stream in an object entry in the packfile.
func (s *Scanner) copyObject(w io.Writer) (n int64, err error) {
generated by cgit (git 2.34.1) at 2024-09-20 17:47:08 +0000