format: Move commitgraph and packfile here

85 files changed, 0 insertions, 1800 deletions

diff --git a/commitgraph/read/bloom.go b/commitgraph/read/bloom.go
deleted file mode 100644
index eca88c36..00000000
--- a/commitgraph/read/bloom.go
+++ /dev/null
@@ -1,117 +0,0 @@
-package read
-
-import (
-	"encoding/binary"
-
-	"codeberg.org/lindenii/furgit/commitgraph/bloom"
-	"codeberg.org/lindenii/furgit/internal/intconv"
-)
-
-// HasBloom reports whether any layer has changed-path Bloom data.
-func (reader *Reader) HasBloom() bool {
-	for i := range reader.layers {
-		layer := &reader.layers[i]
-		if layer.chunkBloomIndex != nil && layer.chunkBloomData != nil && layer.bloomSettings != nil {
-			return true
-		}
-	}
-
-	return false
-}
-
-// BloomVersion returns the changed-path Bloom hash version, or 0 if absent.
-func (reader *Reader) BloomVersion() uint8 {
-	for i := len(reader.layers) - 1; i >= 0; i-- {
-		layer := &reader.layers[i]
-		if layer.bloomSettings != nil {
-			version, err := intconv.Uint32ToUint8(layer.bloomSettings.HashVersion)
-			if err != nil {
-				return 0
-			}
-
-			return version
-		}
-	}
-
-	return 0
-}
-
-// BloomFilterAt returns one commit's changed-path Bloom filter.
-//
-// The returned filter borrows reader-owned mapped commit-graph data and is
-// only valid until the reader is closed.
-//
-// Returns BloomUnavailableError when this commit graph has no Bloom data.
-func (reader *Reader) BloomFilterAt(pos Position) (bloom.Filter, error) {
-	layer, err := reader.layerByPosition(pos)
-	if err != nil {
-		return bloom.Filter{}, err
-	}
-
-	if layer.chunkBloomIndex == nil || layer.chunkBloomData == nil || layer.bloomSettings == nil {
-		return bloom.Filter{}, &BloomUnavailableError{Pos: pos}
-	}
-
-	start, end, err := bloomRange(layer, pos.Index)
-	if err != nil {
-		return bloom.Filter{}, err
-	}
-
-	filter := bloom.NewFilter(
-		layer.chunkBloomData[bloom.DataHeaderSize+start:bloom.DataHeaderSize+end],
-		*layer.bloomSettings,
-	)
-
-	return filter, nil
-}
-
-func bloomRange(layer *layer, commitIndex uint32) (int, int, error) {
-	off64 := uint64(commitIndex) * 4
-
-	off, err := intconv.Uint64ToInt(off64)
-	if err != nil {
-		return 0, 0, err
-	}
-
-	end := binary.BigEndian.Uint32(layer.chunkBloomIndex[off : off+4])
-
-	var start uint32
-
-	if commitIndex > 0 {
-		prevOff64 := uint64(commitIndex-1) * 4
-
-		prevOff, err := intconv.Uint64ToInt(prevOff64)
-		if err != nil {
-			return 0, 0, err
-		}
-
-		start = binary.BigEndian.Uint32(layer.chunkBloomIndex[prevOff : prevOff+4])
-	}
-
-	if end < start {
-		return 0, 0, &MalformedError{Path: layer.path, Reason: "invalid BIDX range"}
-	}
-
-	bdatLen := len(layer.chunkBloomData) - bloom.DataHeaderSize
-
-	bdatLenU32, err := intconv.IntToUint32(bdatLen)
-	if err != nil {
-		return 0, 0, err
-	}
-
-	if end > bdatLenU32 {
-		return 0, 0, &MalformedError{Path: layer.path, Reason: "BIDX range out of BDAT bounds"}
-	}
-
-	startInt, err := intconv.Uint64ToInt(uint64(start))
-	if err != nil {
-		return 0, 0, err
-	}
-
-	endInt, err := intconv.Uint64ToInt(uint64(end))
-	if err != nil {
-		return 0, 0, err
-	}
-
-	return startInt, endInt, nil
-}
diff --git a/commitgraph/read/close.go b/commitgraph/read/close.go
deleted file mode 100644
index f8b6141a..00000000
--- a/commitgraph/read/close.go
+++ /dev/null
@@ -1,20 +0,0 @@
-package read
-
-// Close releases all mapped commit-graph files.
-//
-// Repeated calls to Close are undefined behavior.
-func (reader *Reader) Close() error {
-	var closeErr error
-
-	for i := len(reader.layers) - 1; i >= 0; i-- {
-		err := reader.layers[i].close()
-		if err != nil && closeErr == nil {
-			closeErr = err
-		}
-	}
-
-	reader.layers = nil
-	reader.total = 0
-
-	return closeErr
-}
diff --git a/commitgraph/read/commitat.go b/commitgraph/read/commitat.go
deleted file mode 100644
index a39c5ccd..00000000
--- a/commitgraph/read/commitat.go
+++ /dev/null
@@ -1,85 +0,0 @@
-package read
-
-import (
-	"encoding/binary"
-
-	"codeberg.org/lindenii/furgit/internal/intconv"
-	objectid "codeberg.org/lindenii/furgit/object/id"
-)
-
-// CommitAt returns decoded commit-graph metadata at one position.
-func (reader *Reader) CommitAt(pos Position) (Commit, error) {
-	layer, err := reader.layerByPosition(pos)
-	if err != nil {
-		return Commit{}, err
-	}
-
-	hashSize := reader.algo.Size()
-	stride := hashSize + 16
-
-	strideU64, err := intconv.IntToUint64(stride)
-	if err != nil {
-		return Commit{}, err
-	}
-
-	start64 := uint64(pos.Index) * strideU64
-	end64 := start64 + strideU64
-
-	start, err := intconv.Uint64ToInt(start64)
-	if err != nil {
-		return Commit{}, err
-	}
-
-	end, err := intconv.Uint64ToInt(end64)
-	if err != nil {
-		return Commit{}, err
-	}
-
-	record := layer.chunkCommit[start:end]
-
-	treeOID, err := objectid.FromBytes(reader.algo, record[:hashSize])
-	if err != nil {
-		return Commit{}, err
-	}
-
-	oid, err := reader.OIDAt(pos)
-	if err != nil {
-		return Commit{}, err
-	}
-
-	p1 := binary.BigEndian.Uint32(record[hashSize : hashSize+4])
-	p2 := binary.BigEndian.Uint32(record[hashSize+4 : hashSize+8])
-	genAndTimeHi := binary.BigEndian.Uint32(record[hashSize+8 : hashSize+12])
-	timeLow := binary.BigEndian.Uint32(record[hashSize+12 : hashSize+16])
-
-	timeHigh := uint64(genAndTimeHi & 0x3)
-	commitTimeU64 := (timeHigh << 32) | uint64(timeLow)
-
-	commitTime, err := intconv.Uint64ToInt64(commitTimeU64)
-	if err != nil {
-		return Commit{}, err
-	}
-
-	generationV1 := genAndTimeHi >> 2
-
-	generationV2, err := reader.readGenerationV2(layer, pos.Index, commitTimeU64)
-	if err != nil {
-		return Commit{}, err
-	}
-
-	parent1, parent2, extra, err := reader.decodeParents(layer, p1, p2)
-	if err != nil {
-		return Commit{}, err
-	}
-
-	return Commit{
-		OID:            oid,
-		TreeOID:        treeOID,
-		Parent1:        parent1,
-		Parent2:        parent2,
-		ExtraParents:   extra,
-		CommitTimeUnix: commitTime,
-		GenerationV1:   generationV1,
-		GenerationV2:   generationV2,
-	}, nil
-}
diff --git a/commitgraph/read/commits.go b/commitgraph/read/commits.go
deleted file mode 100644
index 48984ecb..00000000
--- a/commitgraph/read/commits.go
+++ /dev/null
@@ -1,20 +0,0 @@
-package read
-
-import objectid "codeberg.org/lindenii/furgit/object/id"
-
-// Commit stores decoded commit-graph record data.
-type Commit struct {
-	OID            objectid.ObjectID
-	TreeOID        objectid.ObjectID
-	Parent1        ParentRef
-	Parent2        ParentRef
-	ExtraParents   []Position
-	CommitTimeUnix int64
-	GenerationV1   uint32
-	GenerationV2   uint64
-}
-
-// NumCommits returns total commits across loaded layers.
-func (reader *Reader) NumCommits() uint32 {
-	return reader.total
-}
diff --git a/commitgraph/read/doc.go b/commitgraph/read/doc.go
deleted file mode 100644
index 573ddc19..00000000
--- a/commitgraph/read/doc.go
+++ /dev/null
@@ -1,2 +0,0 @@
-// Package read provides routines for reading commit graphs.
-package read
diff --git a/commitgraph/read/edges.go b/commitgraph/read/edges.go
deleted file mode 100644
index 33a6c9fc..00000000
--- a/commitgraph/read/edges.go
+++ /dev/null
@@ -1,48 +0,0 @@
-package read
-
-import (
-	"encoding/binary"
-
-	"codeberg.org/lindenii/furgit/commitgraph"
-	"codeberg.org/lindenii/furgit/internal/intconv"
-)
-
-func (reader *Reader) decodeExtraEdgeList(layer *layer, edgeStart uint32) ([]Position, error) {
-	if len(layer.chunkExtraEdges) == 0 {
-		return nil, &MalformedError{Path: layer.path, Reason: "missing EDGE chunk"}
-	}
-
-	out := make([]Position, 0)
-
-	cur := edgeStart
-	for {
-		off64 := uint64(cur) * 4
-
-		off, err := intconv.Uint64ToInt(off64)
-		if err != nil {
-			return nil, err
-		}
-
-		if off+4 > len(layer.chunkExtraEdges) {
-			return nil, &MalformedError{Path: layer.path, Reason: "EDGE index out of range"}
-		}
-
-		word := binary.BigEndian.Uint32(layer.chunkExtraEdges[off : off+4])
-		parentGlobal := word & commitgraph.ParentLastMask
-
-		parentPos, err := reader.globalToPosition(parentGlobal)
-		if err != nil {
-			return nil, err
-		}
-
-		out = append(out, parentPos)
-
-		if word&commitgraph.ParentExtraMask != 0 {
-			break
-		}
-
-		cur++
-	}
-
-	return out, nil
-}
diff --git a/commitgraph/read/errors.go b/commitgraph/read/errors.go
deleted file mode 100644
index 0a32a368..00000000
--- a/commitgraph/read/errors.go
+++ /dev/null
@@ -1,58 +0,0 @@
-package read
-
-import (
-	"fmt"
-
-	objectid "codeberg.org/lindenii/furgit/object/id"
-)
-
-// NotFoundError reports a missing commit graph entry by object ID.
-type NotFoundError struct {
-	OID objectid.ObjectID
-}
-
-// Error implements error.
-func (err *NotFoundError) Error() string {
-	return fmt.Sprintf("commitgraph: object not found: %s", err.OID)
-}
-
-// PositionOutOfRangeError reports an invalid graph position.
-type PositionOutOfRangeError struct {
-	Pos Position
-}
-
-// Error implements error.
-func (err *PositionOutOfRangeError) Error() string {
-	return fmt.Sprintf("commitgraph: position out of range: graph=%d index=%d", err.Pos.Graph, err.Pos.Index)
-}
-
-// MalformedError reports malformed commit-graph data.
-type MalformedError struct {
-	Path   string
-	Reason string
-}
-
-// Error implements error.
-func (err *MalformedError) Error() string {
-	return fmt.Sprintf("commitgraph: malformed %q: %s", err.Path, err.Reason)
-}
-
-// UnsupportedVersionError reports unsupported commit-graph version.
-type UnsupportedVersionError struct {
-	Version uint8
-}
-
-// Error implements error.
-func (err *UnsupportedVersionError) Error() string {
-	return fmt.Sprintf("commitgraph: unsupported version %d", err.Version)
-}
-
-// BloomUnavailableError reports missing changed-path bloom data at one position.
-type BloomUnavailableError struct {
-	Pos Position
-}
-
-// Error implements error.
-func (err *BloomUnavailableError) Error() string {
-	return fmt.Sprintf("commitgraph: bloom unavailable at position graph=%d index=%d", err.Pos.Graph, err.Pos.Index)
-}
diff --git a/commitgraph/read/generation.go b/commitgraph/read/generation.go
deleted file mode 100644
index 53dabe2d..00000000
--- a/commitgraph/read/generation.go
+++ /dev/null
@@ -1,43 +0,0 @@
-package read
-
-import (
-	"encoding/binary"
-
-	"codeberg.org/lindenii/furgit/commitgraph"
-	"codeberg.org/lindenii/furgit/internal/intconv"
-)
-
-func (reader *Reader) readGenerationV2(layer *layer, index uint32, commitTime uint64) (uint64, error) {
-	if len(layer.chunkGeneration) == 0 {
-		return 0, nil
-	}
-
-	off64 := uint64(index) * 4
-
-	off, err := intconv.Uint64ToInt(off64)
-	if err != nil {
-		return 0, err
-	}
-
-	value := binary.BigEndian.Uint32(layer.chunkGeneration[off : off+4])
-
-	if value&commitgraph.GenerationOverflow == 0 {
-		return commitTime + uint64(value), nil
-	}
-
-	gdo2Index := value ^ commitgraph.GenerationOverflow
-	gdo2Off64 := uint64(gdo2Index) * 8
-
-	gdo2Off, err := intconv.Uint64ToInt(gdo2Off64)
-	if err != nil {
-		return 0, err
-	}
-
-	if gdo2Off+8 > len(layer.chunkGenerationOv) {
-		return 0, &MalformedError{Path: layer.path, Reason: "GDO2 index out of range"}
-	}
-
-	overflow := binary.BigEndian.Uint64(layer.chunkGenerationOv[gdo2Off : gdo2Off+8])
-
-	return commitTime + overflow, nil
-}
diff --git a/commitgraph/read/hash.go b/commitgraph/read/hash.go
deleted file mode 100644
index 3a525afe..00000000
--- a/commitgraph/read/hash.go
+++ /dev/null
@@ -1,79 +0,0 @@
-package read
-
-import (
-	"bytes"
-	"fmt"
-	"io"
-
-	objectid "codeberg.org/lindenii/furgit/object/id"
-)
-
-// HashVersion returns the commit-graph hash version.
-func (reader *Reader) HashVersion() uint8 {
-	return reader.hashVersion
-}
-
-func validateChainBaseHashes(algo objectid.Algorithm, chain []string, idx int, graph *layer) error {
-	if idx == 0 {
-		if len(graph.chunkBaseGraphs) != 0 {
-			return &MalformedError{Path: graph.path, Reason: "unexpected BASE chunk in first graph"}
-		}
-
-		return nil
-	}
-
-	hashSize := algo.Size()
-
-	expectedLen := idx * hashSize
-	if len(graph.chunkBaseGraphs) != expectedLen {
-		return &MalformedError{
-			Path:   graph.path,
-			Reason: fmt.Sprintf("BASE chunk length %d does not match expected %d", len(graph.chunkBaseGraphs), expectedLen),
-		}
-	}
-
-	for i := range idx {
-		start := i * hashSize
-		end := start + hashSize
-
-		baseHash, err := objectid.FromBytes(algo, graph.chunkBaseGraphs[start:end])
-		if err != nil {
-			return err
-		}
-
-		if baseHash.String() != chain[i] {
-			return &MalformedError{
-				Path:   graph.path,
-				Reason: fmt.Sprintf("BASE chunk mismatch at index %d", i),
-			}
-		}
-	}
-
-	return nil
-}
-
-func verifyTrailerHash(data []byte, algo objectid.Algorithm, path string) error {
-	hashSize := algo.Size()
-	if len(data) < hashSize {
-		return &MalformedError{Path: path, Reason: "file too short for trailer"}
-	}
-
-	hashImpl, err := algo.New()
-	if err != nil {
-		return err
-	}
-
-	_, err = io.Copy(hashImpl, bytes.NewReader(data[:len(data)-hashSize]))
-	if err != nil {
-		return err
-	}
-
-	got := hashImpl.Sum(nil)
-
-	want := data[len(data)-hashSize:]
-	if !bytes.Equal(got, want) {
-		return &MalformedError{Path: path, Reason: "trailer hash mismatch"}
-	}
-
-	return nil
-}
diff --git a/commitgraph/read/iterators.go b/commitgraph/read/iterators.go
deleted file mode 100644
index 85c56ff1..00000000
--- a/commitgraph/read/iterators.go
+++ /dev/null
@@ -1,45 +0,0 @@
-package read
-
-import (
-	"iter"
-
-	"codeberg.org/lindenii/furgit/internal/intconv"
-	objectid "codeberg.org/lindenii/furgit/object/id"
-)
-
-// AllPositions iterates all commit positions in native layer order.
-func (reader *Reader) AllPositions() iter.Seq[Position] {
-	return func(yield func(Position) bool) {
-		for layerIdx := range reader.layers {
-			layer := &reader.layers[layerIdx]
-
-			graph, err := intconv.IntToUint32(layerIdx)
-			if err != nil {
-				return
-			}
-
-			for idx := range layer.numCommits {
-				if !yield(Position{Graph: graph, Index: idx}) {
-					return
-				}
-			}
-		}
-	}
-}
-
-// AllOIDs iterates all commit object IDs in native layer order.
-func (reader *Reader) AllOIDs() iter.Seq[objectid.ObjectID] {
-	return func(yield func(objectid.ObjectID) bool) {
-		positions := reader.AllPositions()
-		for pos := range positions {
-			oid, err := reader.OIDAt(pos)
-			if err != nil {
-				return
-			}
-
-			if !yield(oid) {
-				return
-			}
-		}
-	}
-}
diff --git a/commitgraph/read/layer.go b/commitgraph/read/layer.go
deleted file mode 100644
index 3b8abcd2..00000000
--- a/commitgraph/read/layer.go
+++ /dev/null
@@ -1,28 +0,0 @@
-package read
-
-import (
-	"os"
-
-	"codeberg.org/lindenii/furgit/commitgraph/bloom"
-)
-
-type layer struct {
-	path       string
-	file       *os.File
-	data       []byte
-	numCommits uint32
-	baseCount  uint32
-	globalFrom uint32
-
-	chunkOIDFanout    []byte
-	chunkOIDLookup    []byte
-	chunkCommit       []byte
-	chunkGeneration   []byte
-	chunkGenerationOv []byte
-	chunkExtraEdges   []byte
-	chunkBloomIndex   []byte
-	chunkBloomData    []byte
-	chunkBaseGraphs   []byte
-
-	bloomSettings *bloom.Settings
-}
diff --git a/commitgraph/read/layer_close.go b/commitgraph/read/layer_close.go
deleted file mode 100644
index 03dc91d5..00000000
--- a/commitgraph/read/layer_close.go
+++ /dev/null
@@ -1,33 +0,0 @@
-package read
-
-import "syscall"
-
-func closeLayers(layers []layer) {
-	for i := len(layers) - 1; i >= 0; i-- {
-		_ = layers[i].close()
-	}
-}
-
-func (layer *layer) close() error {
-	var closeErr error
-
-	if layer.data != nil {
-		err := syscall.Munmap(layer.data)
-		if err != nil {
-			closeErr = err
-		}
-
-		layer.data = nil
-	}
-
-	if layer.file != nil {
-		err := layer.file.Close()
-		if err != nil && closeErr == nil {
-			closeErr = err
-		}
-
-		layer.file = nil
-	}
-
-	return closeErr
-}
diff --git a/commitgraph/read/layer_lookup.go b/commitgraph/read/layer_lookup.go
deleted file mode 100644
index 84095788..00000000
--- a/commitgraph/read/layer_lookup.go
+++ /dev/null
@@ -1,53 +0,0 @@
-package read
-
-import (
-	"bytes"
-	"encoding/binary"
-
-	"codeberg.org/lindenii/furgit/internal/intconv"
-	objectid "codeberg.org/lindenii/furgit/object/id"
-)
-
-func layerLookup(layer *layer, oid objectid.ObjectID) (uint32, bool) {
-	hashSize := oid.Size()
-	first := int(oid.RawBytes()[0])
-
-	var lo uint32
-	if first > 0 {
-		lo = binary.BigEndian.Uint32(layer.chunkOIDFanout[(first-1)*4 : first*4])
-	}
-
-	hi := binary.BigEndian.Uint32(layer.chunkOIDFanout[first*4 : (first+1)*4])
-	if hi == 0 || lo >= hi {
-		return 0, false
-	}
-
-	target := oid.RawBytes()
-	left := int(lo)
-
-	right := int(hi) - 1
-	for left <= right {
-		mid := left + (right-left)/2
-		start := mid * hashSize
-		end := start + hashSize
-
-		current := layer.chunkOIDLookup[start:end]
-
-		cmp := bytes.Compare(current, target)
-		switch {
-		case cmp == 0:
-			pos, err := intconv.IntToUint32(mid)
-			if err != nil {
-				return 0, false
-			}
-
-			return pos, true
-		case cmp < 0:
-			left = mid + 1
-		default:
-			right = mid - 1
-		}
-	}
-
-	return 0, false
-}
diff --git a/commitgraph/read/layer_open.go b/commitgraph/read/layer_open.go
deleted file mode 100644
index 3ecd4672..00000000
--- a/commitgraph/read/layer_open.go
+++ /dev/null
@@ -1,81 +0,0 @@
-package read
-
-import (
-	"os"
-	"syscall"
-
-	"codeberg.org/lindenii/furgit/commitgraph"
-	"codeberg.org/lindenii/furgit/internal/intconv"
-	objectid "codeberg.org/lindenii/furgit/object/id"
-)
-
-func openLayer(root *os.Root, relPath string, algo objectid.Algorithm) (*layer, error) {
-	file, err := root.Open(relPath)
-	if err != nil {
-		return nil, err
-	}
-
-	info, err := file.Stat()
-	if err != nil {
-		_ = file.Close()
-
-		return nil, err
-	}
-
-	size := info.Size()
-	if size < int64(commitgraph.HeaderSize+commitgraph.FanoutSize+algo.Size()) {
-		_ = file.Close()
-
-		return nil, &MalformedError{Path: relPath, Reason: "file too short"}
-	}
-
-	mapLen, err := intconv.Int64ToUint64(size)
-	if err != nil {
-		_ = file.Close()
-
-		return nil, err
-	}
-
-	mapLenInt, err := intconv.Uint64ToInt(mapLen)
-	if err != nil {
-		_ = file.Close()
-
-		return nil, err
-	}
-
-	fd, err := intconv.UintptrToInt(file.Fd())
-	if err != nil {
-		_ = file.Close()
-
-		return nil, err
-	}
-
-	data, err := syscall.Mmap(fd, 0, mapLenInt, syscall.PROT_READ, syscall.MAP_PRIVATE)
-	if err != nil {
-		_ = file.Close()
-
-		return nil, err
-	}
-
-	out := &layer{
-		path: relPath,
-		file: file,
-		data: data,
-	}
-
-	parseErr := parseLayer(out, algo)
-	if parseErr != nil {
-		_ = out.close()
-
-		return nil, parseErr
-	}
-
-	verifyErr := verifyTrailerHash(out.data, algo, relPath)
-	if verifyErr != nil {
-		_ = out.close()
-
-		return nil, verifyErr
-	}
-
-	return out, nil
-}
diff --git a/commitgraph/read/layer_parse.go b/commitgraph/read/layer_parse.go
deleted file mode 100644
index 2aa71428..00000000
--- a/commitgraph/read/layer_parse.go
+++ /dev/null
@@ -1,276 +0,0 @@
-package read
-
-import (
-	"encoding/binary"
-
-	"codeberg.org/lindenii/furgit/commitgraph"
-	"codeberg.org/lindenii/furgit/commitgraph/bloom"
-	"codeberg.org/lindenii/furgit/internal/intconv"
-	objectid "codeberg.org/lindenii/furgit/object/id"
-)
-
-func parseLayer(layer *layer, algo objectid.Algorithm) error { //nolint:maintidx
-	if len(layer.data) < commitgraph.HeaderSize {
-		return &MalformedError{Path: layer.path, Reason: "file too short"}
-	}
-
-	header := layer.data[:commitgraph.HeaderSize]
-
-	signature := binary.BigEndian.Uint32(header[:4])
-	if signature != commitgraph.FileSignature {
-		return &MalformedError{Path: layer.path, Reason: "invalid signature"}
-	}
-
-	version := header[4]
-	if version != commitgraph.FileVersion {
-		return &UnsupportedVersionError{Version: version}
-	}
-
-	expectedHashVersion, err := intconv.Uint32ToUint8(algo.PackHashID())
-	if err != nil {
-		return err
-	}
-
-	hashVersion := header[5]
-	if hashVersion != expectedHashVersion {
-		return &MalformedError{Path: layer.path, Reason: "hash version does not match object format"}
-	}
-
-	numChunks := int(header[6])
-	baseCount := uint32(header[7])
-
-	tocLen := (numChunks + 1) * commitgraph.ChunkEntrySize
-	tocStart := commitgraph.HeaderSize
-
-	tocEnd := tocStart + tocLen
-	if tocEnd > len(layer.data) {
-		return &MalformedError{Path: layer.path, Reason: "truncated chunk table"}
-	}
-
-	type tocEntry struct {
-		id     uint32
-		offset uint64
-	}
-
-	entries := make([]tocEntry, 0, numChunks+1)
-	for i := range numChunks + 1 {
-		entryOff := tocStart + i*commitgraph.ChunkEntrySize
-		entryData := layer.data[entryOff : entryOff+commitgraph.ChunkEntrySize]
-
-		entry := tocEntry{
-			id:     binary.BigEndian.Uint32(entryData[:4]),
-			offset: binary.BigEndian.Uint64(entryData[4:]),
-		}
-		entries = append(entries, entry)
-	}
-
-	if entries[len(entries)-1].id != 0 {
-		return &MalformedError{Path: layer.path, Reason: "missing chunk table terminator"}
-	}
-
-	trailerStart := len(layer.data) - algo.Size()
-
-	chunks := make(map[uint32][]byte, numChunks)
-	for i := range numChunks {
-		entry := entries[i]
-		if entry.id == 0 {
-			return &MalformedError{Path: layer.path, Reason: "early chunk table terminator"}
-		}
-
-		next := entries[i+1]
-
-		start, err := intconv.Uint64ToInt(entry.offset)
-		if err != nil {
-			return err
-		}
-
-		end, err := intconv.Uint64ToInt(next.offset)
-		if err != nil {
-			return err
-		}
-
-		if start < tocEnd || end < start || end > trailerStart {
-			return &MalformedError{Path: layer.path, Reason: "invalid chunk offsets"}
-		}
-
-		if _, exists := chunks[entry.id]; exists {
-			return &MalformedError{Path: layer.path, Reason: "duplicate chunk id"}
-		}
-
-		chunks[entry.id] = layer.data[start:end]
-	}
-
-	oidf := chunks[commitgraph.ChunkOIDF]
-	if len(oidf) != commitgraph.FanoutSize {
-		return &MalformedError{Path: layer.path, Reason: "invalid OIDF length"}
-	}
-
-	layer.chunkOIDFanout = oidf
-	layer.numCommits = binary.BigEndian.Uint32(oidf[commitgraph.FanoutSize-4:])
-
-	for i := range 255 {
-		cur := binary.BigEndian.Uint32(oidf[i*4 : (i+1)*4])
-
-		next := binary.BigEndian.Uint32(oidf[(i+1)*4 : (i+2)*4])
-		if cur > next {
-			return &MalformedError{Path: layer.path, Reason: "non-monotonic OIDF fanout"}
-		}
-	}
-
-	hashSize := algo.Size()
-
-	hashSizeU64, err := intconv.IntToUint64(hashSize)
-	if err != nil {
-		return err
-	}
-
-	oidl := chunks[commitgraph.ChunkOIDL]
-	oidlWantLen64 := uint64(layer.numCommits) * hashSizeU64
-
-	oidlWantLen, err := intconv.Uint64ToInt(oidlWantLen64)
-	if err != nil {
-		return err
-	}
-
-	if len(oidl) != oidlWantLen {
-		return &MalformedError{Path: layer.path, Reason: "invalid OIDL length"}
-	}
-
-	layer.chunkOIDLookup = oidl
-
-	stride := hashSize + 16
-
-	strideU64, err := intconv.IntToUint64(stride)
-	if err != nil {
-		return err
-	}
-
-	cdat := chunks[commitgraph.ChunkCDAT]
-	cdatWantLen64 := uint64(layer.numCommits) * strideU64
-
-	cdatWantLen, err := intconv.Uint64ToInt(cdatWantLen64)
-	if err != nil {
-		return err
-	}
-
-	if len(cdat) != cdatWantLen {
-		return &MalformedError{Path: layer.path, Reason: "invalid CDAT length"}
-	}
-
-	layer.chunkCommit = cdat
-
-	gda2 := chunks[commitgraph.ChunkGDA2]
-	if len(gda2) != 0 {
-		wantLen64 := uint64(layer.numCommits) * 4
-
-		wantLen, err := intconv.Uint64ToInt(wantLen64)
-		if err != nil {
-			return err
-		}
-
-		if len(gda2) != wantLen {
-			return &MalformedError{Path: layer.path, Reason: "invalid GDA2 length"}
-		}
-
-		layer.chunkGeneration = gda2
-	}
-
-	gdo2 := chunks[commitgraph.ChunkGDO2]
-	if len(gdo2) != 0 {
-		if len(gdo2)%8 != 0 {
-			return &MalformedError{Path: layer.path, Reason: "invalid GDO2 length"}
-		}
-
-		layer.chunkGenerationOv = gdo2
-	}
-
-	edge := chunks[commitgraph.ChunkEDGE]
-	if len(edge) != 0 {
-		if len(edge)%4 != 0 {
-			return &MalformedError{Path: layer.path, Reason: "invalid EDGE length"}
-		}
-
-		layer.chunkExtraEdges = edge
-	}
-
-	base := chunks[commitgraph.ChunkBASE]
-	if baseCount == 0 {
-		if len(base) != 0 {
-			return &MalformedError{Path: layer.path, Reason: "unexpected BASE chunk"}
-		}
-	} else {
-		wantLen64 := uint64(baseCount) * hashSizeU64
-
-		wantLen, err := intconv.Uint64ToInt(wantLen64)
-		if err != nil {
-			return err
-		}
-
-		if len(base) != wantLen {
-			return &MalformedError{Path: layer.path, Reason: "invalid BASE length"}
-		}
-
-		layer.chunkBaseGraphs = base
-	}
-
-	layer.baseCount = baseCount
-
-	bidx := chunks[commitgraph.ChunkBIDX]
-
-	bdat := chunks[commitgraph.ChunkBDAT]
-	if len(bidx) != 0 || len(bdat) != 0 { //nolint:nestif
-		if len(bidx) == 0 || len(bdat) == 0 {
-			return &MalformedError{Path: layer.path, Reason: "BIDX/BDAT must both be present"}
-		}
-
-		bidxWantLen64 := uint64(layer.numCommits) * 4
-
-		bidxWantLen, err := intconv.Uint64ToInt(bidxWantLen64)
-		if err != nil {
-			return err
-		}
-
-		if len(bidx) != bidxWantLen {
-			return &MalformedError{Path: layer.path, Reason: "invalid BIDX length"}
-		}
-
-		if len(bdat) < bloom.DataHeaderSize {
-			return &MalformedError{Path: layer.path, Reason: "invalid BDAT length"}
-		}
-
-		settings, err := bloom.ParseSettings(bdat)
-		if err != nil {
-			return err
-		}
-
-		prev := uint32(0)
-
-		for i := range layer.numCommits {
-			off := int(i) * 4
-
-			cur := binary.BigEndian.Uint32(bidx[off : off+4])
-			if i > 0 && cur < prev {
-				return &MalformedError{Path: layer.path, Reason: "non-monotonic BIDX"}
-			}
-
-			bdatDataLen := len(bdat) - bloom.DataHeaderSize
-
-			bdatDataLenU32, err := intconv.IntToUint32(bdatDataLen)
-			if err != nil {
-				return err
-			}
-
-			if cur > bdatDataLenU32 {
-				return &MalformedError{Path: layer.path, Reason: "BIDX offset out of range"}
-			}
-
-			prev = cur
-		}
-
-		layer.chunkBloomIndex = bidx
-		layer.chunkBloomData = bdat
-		layer.bloomSettings = settings
-	}
-
-	return nil
-}
diff --git a/commitgraph/read/layer_pos.go b/commitgraph/read/layer_pos.go
deleted file mode 100644
index 7b87b381..00000000
--- a/commitgraph/read/layer_pos.go
+++ /dev/null
@@ -1,21 +0,0 @@
-package read
-
-import "codeberg.org/lindenii/furgit/internal/intconv"
-
-func (reader *Reader) layerByPosition(pos Position) (*layer, error) {
-	graphIdx, err := intconv.Uint64ToInt(uint64(pos.Graph))
-	if err != nil {
-		return nil, err
-	}
-
-	if graphIdx < 0 || graphIdx >= len(reader.layers) {
-		return nil, &PositionOutOfRangeError{Pos: pos}
-	}
-
-	layer := &reader.layers[graphIdx]
-	if pos.Index >= layer.numCommits {
-		return nil, &PositionOutOfRangeError{Pos: pos}
-	}
-
-	return layer, nil
-}
diff --git a/commitgraph/read/layerinfo.go b/commitgraph/read/layerinfo.go
deleted file mode 100644
index 83c4407d..00000000
--- a/commitgraph/read/layerinfo.go
+++ /dev/null
@@ -1,23 +0,0 @@
-package read
-
-// LayerInfo describes one loaded commit-graph layer.
-type LayerInfo struct {
-	Path      string
-	BaseCount uint32
-	Commits   uint32
-}
-
-// Layers returns loaded layer metadata in native chain order.
-func (reader *Reader) Layers() []LayerInfo {
-	out := make([]LayerInfo, 0, len(reader.layers))
-	for i := range reader.layers {
-		layer := reader.layers[i]
-		out = append(out, LayerInfo{
-			Path:      layer.path,
-			BaseCount: layer.baseCount,
-			Commits:   layer.numCommits,
-		})
-	}
-
-	return out
-}
diff --git a/commitgraph/read/lookup.go b/commitgraph/read/lookup.go
deleted file mode 100644
index 5f1b08f6..00000000
--- a/commitgraph/read/lookup.go
+++ /dev/null
@@ -1,29 +0,0 @@
-package read
-
-import (
-	"codeberg.org/lindenii/furgit/internal/intconv"
-	objectid "codeberg.org/lindenii/furgit/object/id"
-)
-
-// Lookup resolves one object ID to one graph position.
-func (reader *Reader) Lookup(oid objectid.ObjectID) (Position, error) {
-	if oid.Algorithm() != reader.algo {
-		return Position{}, &NotFoundError{OID: oid}
-	}
-
-	for layerIdx := len(reader.layers) - 1; layerIdx >= 0; layerIdx-- {
-		layer := &reader.layers[layerIdx]
-
-		found, ok := layerLookup(layer, oid)
-		if ok {
-			idxU32, err := intconv.IntToUint32(layerIdx)
-			if err != nil {
-				return Position{}, err
-			}
-
-			return Position{Graph: idxU32, Index: found}, nil
-		}
-	}
-
-	return Position{}, &NotFoundError{OID: oid}
-}
diff --git a/commitgraph/read/mode.go b/commitgraph/read/mode.go
deleted file mode 100644
index 76afa21f..00000000
--- a/commitgraph/read/mode.go
+++ /dev/null
@@ -1,11 +0,0 @@
-package read
-
-// OpenMode controls which commit-graph layout Open loads.
-type OpenMode uint8
-
-const (
-	// OpenSingle opens one commit-graph file at info/commit-graph.
-	OpenSingle OpenMode = iota
-	// OpenChain opens chained commit-graphs from info/commit-graphs.
-	OpenChain
-)
diff --git a/commitgraph/read/oidat.go b/commitgraph/read/oidat.go
deleted file mode 100644
index 908cbc1c..00000000
--- a/commitgraph/read/oidat.go
+++ /dev/null
@@ -1,36 +0,0 @@
-package read
-
-import (
-	"codeberg.org/lindenii/furgit/internal/intconv"
-	objectid "codeberg.org/lindenii/furgit/object/id"
-)
-
-// OIDAt returns object ID at one position.
-func (reader *Reader) OIDAt(pos Position) (objectid.ObjectID, error) {
-	layer, err := reader.layerByPosition(pos)
-	if err != nil {
-		return objectid.ObjectID{}, err
-	}
-
-	hashSize := reader.algo.Size()
-
-	hashSizeU64, err := intconv.IntToUint64(hashSize)
-	if err != nil {
-		return objectid.ObjectID{}, err
-	}
-
-	start64 := uint64(pos.Index) * hashSizeU64
-	end64 := start64 + hashSizeU64
-
-	start, err := intconv.Uint64ToInt(start64)
-	if err != nil {
-		return objectid.ObjectID{}, err
-	}
-
-	end, err := intconv.Uint64ToInt(end64)
-	if err != nil {
-		return objectid.ObjectID{}, err
-	}
-
-	return objectid.FromBytes(reader.algo, layer.chunkOIDLookup[start:end])
-}
diff --git a/commitgraph/read/open.go b/commitgraph/read/open.go
deleted file mode 100644
index 9c708b49..00000000
--- a/commitgraph/read/open.go
+++ /dev/null
@@ -1,26 +0,0 @@
-package read
-
-import (
-	"fmt"
-	"os"
-
-	objectid "codeberg.org/lindenii/furgit/object/id"
-)
-
-// Open opens commit-graph data from one objects root.
-//
-// Open borrows root during construction and does not close it.
-func Open(root *os.Root, algo objectid.Algorithm, mode OpenMode) (*Reader, error) {
-	if algo.Size() == 0 {
-		return nil, objectid.ErrInvalidAlgorithm
-	}
-
-	switch mode {
-	case OpenSingle:
-		return openSingle(root, algo)
-	case OpenChain:
-		return openChain(root, algo)
-	default:
-		return nil, fmt.Errorf("commitgraph: invalid open mode %d", mode)
-	}
-}
diff --git a/commitgraph/read/open_chain.go b/commitgraph/read/open_chain.go
deleted file mode 100644
index b55f3e57..00000000
--- a/commitgraph/read/open_chain.go
+++ /dev/null
@@ -1,133 +0,0 @@
-package read
-
-import (
-	"bufio"
-	"errors"
-	"fmt"
-	"os"
-	"strings"
-
-	"codeberg.org/lindenii/furgit/internal/intconv"
-	objectid "codeberg.org/lindenii/furgit/object/id"
-)
-
-func openChain(root *os.Root, algo objectid.Algorithm) (*Reader, error) {
-	chainPath := "info/commit-graphs/commit-graph-chain"
-
-	file, err := root.Open(chainPath)
-	if err != nil {
-		if errors.Is(err, os.ErrNotExist) {
-			return nil, &MalformedError{Path: chainPath, Reason: "missing commit-graph-chain"}
-		}
-
-		return nil, err
-	}
-
-	scanner := bufio.NewScanner(file)
-	hashes := make([]string, 0)
-
-	for scanner.Scan() {
-		line := strings.TrimSpace(scanner.Text())
-		if line == "" {
-			continue
-		}
-
-		hashes = append(hashes, line)
-	}
-
-	scanErr := scanner.Err()
-	closeErr := file.Close()
-
-	if scanErr != nil {
-		return nil, scanErr
-	}
-
-	if closeErr != nil {
-		return nil, closeErr
-	}
-
-	if len(hashes) == 0 {
-		return nil, &MalformedError{Path: chainPath, Reason: "empty chain"}
-	}
-
-	layers := make([]layer, 0, len(hashes))
-
-	var total uint32
-
-	hashVersion, err := intconv.Uint32ToUint8(algo.PackHashID())
-	if err != nil {
-		return nil, err
-	}
-
-	for i, hashHex := range hashes {
-		expectedBaseCount, err := intconv.IntToUint32(i)
-		if err != nil {
-			closeLayers(layers)
-
-			return nil, err
-		}
-
-		if len(hashHex) != algo.HexLen() {
-			closeLayers(layers)
-
-			return nil, &MalformedError{
-				Path:   chainPath,
-				Reason: fmt.Sprintf("invalid graph hash length at line %d", i+1),
-			}
-		}
-
-		relPath := fmt.Sprintf("info/commit-graphs/graph-%s.graph", hashHex)
-
-		loaded, loadErr := openLayer(root, relPath, algo)
-		if loadErr != nil {
-			closeLayers(layers)
-
-			return nil, loadErr
-		}
-
-		if loaded.baseCount != expectedBaseCount {
-			_ = loaded.close()
-
-			closeLayers(layers)
-
-			return nil, &MalformedError{
-				Path:   relPath,
-				Reason: fmt.Sprintf("BASE count %d does not match chain depth %d", loaded.baseCount, i),
-			}
-		}
-
-		validateErr := validateChainBaseHashes(algo, hashes, i, loaded)
-		if validateErr != nil {
-			_ = loaded.close()
-
-			closeLayers(layers)
-
-			return nil, validateErr
-		}
-
-		loaded.globalFrom = total
-		loaded.baseCount = expectedBaseCount
-
-		totalNext := total + loaded.numCommits
-		if totalNext < total {
-			_ = loaded.close()
-
-			closeLayers(layers)
-
-			return nil, &MalformedError{Path: relPath, Reason: "total commit count overflow"}
-		}
-
-		total = totalNext
-
-		layers = append(layers, *loaded)
-	}
-
-	out := &Reader{
-		algo:        algo,
-		hashVersion: hashVersion,
-		layers:      layers,
-		total:       total,
-	}
-
-	return out, nil
-}
diff --git a/commitgraph/read/open_single.go b/commitgraph/read/open_single.go
deleted file mode 100644
index 9ad6607f..00000000
--- a/commitgraph/read/open_single.go
+++ /dev/null
@@ -1,32 +0,0 @@
-package read
-
-import (
-	"os"
-
-	"codeberg.org/lindenii/furgit/internal/intconv"
-	objectid "codeberg.org/lindenii/furgit/object/id"
-)
-
-func openSingle(root *os.Root, algo objectid.Algorithm) (*Reader, error) {
-	graph, err := openLayer(root, "info/commit-graph", algo)
-	if err != nil {
-		return nil, err
-	}
-
-	graph.baseCount = 0
-	graph.globalFrom = 0
-
-	hashVersion, err := intconv.Uint32ToUint8(algo.PackHashID())
-	if err != nil {
-		return nil, err
-	}
-
-	out := &Reader{
-		algo:        algo,
-		hashVersion: hashVersion,
-		layers:      []layer{*graph},
-		total:       graph.numCommits,
-	}
-
-	return out, nil
-}
diff --git a/commitgraph/read/parents.go b/commitgraph/read/parents.go
deleted file mode 100644
index deb5ea98..00000000
--- a/commitgraph/read/parents.go
+++ /dev/null
@@ -1,67 +0,0 @@
-package read
-
-import "codeberg.org/lindenii/furgit/commitgraph"
-
-// ParentRef references one parent position.
-type ParentRef struct {
-	Valid bool
-	Pos   Position
-}
-
-func (reader *Reader) decodeParents(layer *layer, p1, p2 uint32) (ParentRef, ParentRef, []Position, error) {
-	parent1, err := reader.decodeSingleParent(p1)
-	if err != nil {
-		return ParentRef{}, ParentRef{}, nil, err
-	}
-
-	if p2 == commitgraph.ParentNone {
-		return parent1, ParentRef{}, nil, nil
-	}
-
-	if p2&commitgraph.ParentExtraMask == 0 {
-		parent2, err := reader.decodeSingleParent(p2)
-		if err != nil {
-			return ParentRef{}, ParentRef{}, nil, err
-		}
-
-		return parent1, parent2, nil, nil
-	}
-
-	edgeStart := p2 & commitgraph.ParentLastMask
-
-	parents, err := reader.decodeExtraEdgeList(layer, edgeStart)
-	if err != nil {
-		return ParentRef{}, ParentRef{}, nil, err
-	}
-
-	if len(parents) == 0 {
-		return ParentRef{}, ParentRef{}, nil, &MalformedError{Path: layer.path, Reason: "empty EDGE list"}
-	}
-
-	parent2 := ParentRef{Valid: true, Pos: parents[0]}
-	if len(parents) == 1 {
-		return parent1, parent2, nil, nil
-	}
-
-	return parent1, parent2, parents[1:], nil
-}
-
-func (reader *Reader) decodeSingleParent(raw uint32) (ParentRef, error) {
-	if raw == commitgraph.ParentNone {
-		return ParentRef{}, nil
-	}
-
-	if raw&commitgraph.ParentExtraMask != 0 {
-		return ParentRef{}, &MalformedError{
-			Path:   "commit-graph",
-			Reason: "unexpected EDGE marker in single-parent slot",
-		}
-	}
-
-	pos, err := reader.globalToPosition(raw)
-	if err != nil {
-		return ParentRef{}, err
-	}
-
-	return ParentRef{Valid: true, Pos: pos}, nil
-}
diff --git a/commitgraph/read/position.go b/commitgraph/read/position.go
deleted file mode 100644
index b2e1138b..00000000
--- a/commitgraph/read/position.go
+++ /dev/null
@@ -1,38 +0,0 @@
-package read
-
-import (
-	"fmt"
-
-	"codeberg.org/lindenii/furgit/internal/intconv"
-)
-
-// Position identifies one commit record by layer and row index.
-type Position struct {
-	Graph uint32
-	Index uint32
-}
-
-func (reader *Reader) globalToPosition(global uint32) (Position, error) {
-	for i := range reader.layers {
-		layer := &reader.layers[i]
-		from := layer.globalFrom
-
-		to := from + layer.numCommits
-		if global >= from && global < to {
-			graph, err := intconv.IntToUint32(i)
-			if err != nil {
-				return Position{}, err
-			}
-
-			return Position{
-				Graph: graph,
-				Index: global - from,
-			}, nil
-		}
-	}
-
-	return Position{}, &MalformedError{
-		Path:   "commit-graph",
-		Reason: fmt.Sprintf("parent global position out of range: %d", global),
-	}
-}
diff --git a/commitgraph/read/read_test.go b/commitgraph/read/read_test.go
deleted file mode 100644
index bf87ec5d..00000000
--- a/commitgraph/read/read_test.go
+++ /dev/null
@@ -1,322 +0,0 @@
-package read_test
-
-import (
-	"errors"
-	"path/filepath"
-	"strconv"
-	"strings"
-	"testing"
-
-	"codeberg.org/lindenii/furgit/commitgraph/bloom"
-	"codeberg.org/lindenii/furgit/commitgraph/read"
-	"codeberg.org/lindenii/furgit/internal/intconv"
-	"codeberg.org/lindenii/furgit/internal/testgit"
-	objectid "codeberg.org/lindenii/furgit/object/id"
-)
-
-func fixtureRepoPath(t *testing.T, algo objectid.Algorithm, name string) string {
-	t.Helper()
-
-	return filepath.Join("testdata", "fixtures", algo.String(), name, "repo.git")
-}
-
-func fixtureRepo(t *testing.T, algo objectid.Algorithm, name string) *testgit.TestRepo {
-	t.Helper()
-
-	return testgit.NewRepoFromFixture(t, algo, fixtureRepoPath(t, algo, name))
-}
-
-func TestReadSingleMatchesGit(t *testing.T) {
-	t.Parallel()
-
-	testgit.ForEachAlgorithm(t, func(t *testing.T, algo objectid.Algorithm) { //nolint:thelper
-		testRepo := fixtureRepo(t, algo, "single_changed")
-
-		reader := openReader(t, testRepo, read.OpenSingle)
-
-		defer func() { _ = reader.Close() }()
-
-		allIDs := testRepo.RevList(t, "--all")
-		if len(allIDs) == 0 {
-			t.Fatal("git rev-list --all returned no commits")
-		}
-
-		wantCommitCount, err := intconv.IntToUint32(len(allIDs))
-		if err != nil {
-			t.Fatalf("len(allIDs) convert: %v", err)
-		}
-
-		if got := reader.NumCommits(); got != wantCommitCount {
-			t.Fatalf("NumCommits() = %d, want %d", got, len(allIDs))
-		}
-
-		if !reader.HasBloom() {
-			t.Fatal("HasBloom() = false, want true")
-		}
-
-		bloomVersion := reader.BloomVersion()
-		if bloomVersion == 0 {
-			t.Fatal("BloomVersion() = 0, want non-zero when HasBloom() is true")
-		}
-
-		for _, id := range allIDs {
-			pos, err := reader.Lookup(id)
-			if err != nil {
-				t.Fatalf("Lookup(%s): %v", id, err)
-			}
-
-			gotID, err := reader.OIDAt(pos)
-			if err != nil {
-				t.Fatalf("OIDAt(%+v): %v", pos, err)
-			}
-
-			if gotID != id {
-				t.Fatalf("OIDAt(Lookup(%s)) = %s, want %s", id, gotID, id)
-			}
-		}
-
-		step := max(len(allIDs)/24, 1)
-
-		for i, id := range allIDs {
-			if i%step != 0 && i != len(allIDs)-1 {
-				continue
-			}
-
-			verifyCommitAgainstGit(t, testRepo, reader, id)
-		}
-	})
-}
-
-func TestReadChainMatchesGit(t *testing.T) {
-	t.Parallel()
-
-	testgit.ForEachAlgorithm(t, func(t *testing.T, algo objectid.Algorithm) { //nolint:thelper
-		testRepo := fixtureRepo(t, algo, "chain_changed")
-
-		reader := openReader(t, testRepo, read.OpenChain)
-
-		defer func() { _ = reader.Close() }()
-
-		layers := reader.Layers()
-		if len(layers) < 2 {
-			t.Fatalf("Layers len = %d, want >= 2", len(layers))
-		}
-
-		allIDs := testRepo.RevList(t, "--all")
-
-		wantCommitCount, err := intconv.IntToUint32(len(allIDs))
-		if err != nil {
-			t.Fatalf("len(allIDs) convert: %v", err)
-		}
-
-		if got := reader.NumCommits(); got != wantCommitCount {
-			t.Fatalf("NumCommits() = %d, want %d", got, len(allIDs))
-		}
-
-		step := max(len(allIDs)/20, 1)
-
-		for i, id := range allIDs {
-			pos, err := reader.Lookup(id)
-			if err != nil {
-				t.Fatalf("Lookup(%s): %v", id, err)
-			}
-
-			if i%step != 0 && i != len(allIDs)-1 {
-				continue
-			}
-
-			gotID, err := reader.OIDAt(pos)
-			if err != nil {
-				t.Fatalf("OIDAt(%+v): %v", pos, err)
-			}
-
-			if gotID != id {
-				t.Fatalf("OIDAt(Lookup(%s)) = %s, want %s", id, gotID, id)
-			}
-		}
-	})
-}
-
-func TestBloomUnavailableWithoutChangedPaths(t *testing.T) {
-	t.Parallel()
-
-	testgit.ForEachAlgorithm(t, func(t *testing.T, algo objectid.Algorithm) { //nolint:thelper
-		testRepo := fixtureRepo(t, algo, "single_nochanged")
-
-		reader := openReader(t, testRepo, read.OpenSingle)
-
-		defer func() { _ = reader.Close() }()
-
-		head := testRepo.RevParse(t, "HEAD")
-
-		pos, err := reader.Lookup(head)
-		if err != nil {
-			t.Fatalf("Lookup(%s): %v", head, err)
-		}
-
-		_, err = reader.BloomFilterAt(pos)
-		if err == nil {
-			t.Fatal("BloomFilterAt() error = nil, want BloomUnavailableError")
-		}
-
-		unavailable, ok := errors.AsType[*read.BloomUnavailableError](err)
-		if !ok {
-			t.Fatalf("BloomFilterAt() error type = %T, want *BloomUnavailableError", err)
-		}
-
-		if unavailable.Pos != pos {
-			t.Fatalf("BloomUnavailableError.Pos = %+v, want %+v", unavailable.Pos, pos)
-		}
-	})
-}
-
-func openReader(tb testing.TB, testRepo *testgit.TestRepo, mode read.OpenMode) *read.Reader {
-	tb.Helper()
-
-	root := testRepo.OpenObjectsRoot(tb)
-
-	reader, err := read.Open(root, testRepo.Algorithm(), mode)
-	if err != nil {
-		tb.Fatalf("read.Open(objects): %v", err)
-	}
-
-	return reader
-}
-
-func verifyCommitAgainstGit(tb testing.TB, testRepo *testgit.TestRepo, reader *read.Reader, id objectid.ObjectID) {
-	tb.Helper()
-
-	pos, err := reader.Lookup(id)
-	if err != nil {
-		tb.Fatalf("Lookup(%s): %v", id, err)
-	}
-
-	commit, err := reader.CommitAt(pos)
-	if err != nil {
-		tb.Fatalf("CommitAt(%+v): %v", pos, err)
-	}
-
-	if commit.OID != id {
-		tb.Fatalf("CommitAt(%+v).OID = %s, want %s", pos, commit.OID, id)
-	}
-
-	treeHex := testRepo.Run(tb, "show", "-s", "--format=%T", id.String())
-
-	wantTree, err := objectid.ParseHex(testRepo.Algorithm(), treeHex)
-	if err != nil {
-		tb.Fatalf("parse tree id %q: %v", treeHex, err)
-	}
-
-	if commit.TreeOID != wantTree {
-		tb.Fatalf("CommitAt(%+v).TreeOID = %s, want %s", pos, commit.TreeOID, wantTree)
-	}
-
-	wantParents := parseOIDLine(tb, testRepo.Algorithm(), testRepo.Run(tb, "show", "-s", "--format=%P", id.String()))
-
-	gotParents := commitParents(tb, reader, commit)
-	if len(gotParents) != len(wantParents) {
-		tb.Fatalf("parent count for %s = %d, want %d", id, len(gotParents), len(wantParents))
-	}
-
-	for i := range gotParents {
-		if gotParents[i] != wantParents[i] {
-			tb.Fatalf("parent %d for %s = %s, want %s", i, id, gotParents[i], wantParents[i])
-		}
-	}
-
-	commitTimeRaw := testRepo.Run(tb, "show", "-s", "--format=%ct", id.String())
-
-	wantCommitTime, err := strconv.ParseInt(strings.TrimSpace(commitTimeRaw), 10, 64)
-	if err != nil {
-		tb.Fatalf("parse commit time %q: %v", commitTimeRaw, err)
-	}
-
-	if commit.CommitTimeUnix != wantCommitTime {
-		tb.Fatalf("CommitAt(%+v).CommitTimeUnix = %d, want %d", pos, commit.CommitTimeUnix, wantCommitTime)
-	}
-
-	filter, err := reader.BloomFilterAt(pos)
-	if err != nil {
-		tb.Fatalf("BloomFilterAt(%+v): %v", pos, err)
-	}
-
-	if filter.HashVersion != uint32(reader.BloomVersion()) {
-		tb.Fatalf("filter.HashVersion = %d, want %d", filter.HashVersion, reader.BloomVersion())
-	}
-
-	assertChangedPathsBloomPositive(tb, testRepo, filter, id)
-}
-
-func commitParents(tb testing.TB, reader *read.Reader, commit read.Commit) []objectid.ObjectID {
-	tb.Helper()
-
-	out := make([]objectid.ObjectID, 0, 2+len(commit.ExtraParents))
-
-	if commit.Parent1.Valid {
-		id, err := reader.OIDAt(commit.Parent1.Pos)
-		if err != nil {
-			tb.Fatalf("OIDAt(parent1 %+v): %v", commit.Parent1.Pos, err)
-		}
-
-		out = append(out, id)
-	}
-
-	if commit.Parent2.Valid {
-		id, err := reader.OIDAt(commit.Parent2.Pos)
-		if err != nil {
-			tb.Fatalf("OIDAt(parent2 %+v): %v", commit.Parent2.Pos, err)
-		}
-
-		out = append(out, id)
-	}
-
-	for _, parentPos := range commit.ExtraParents {
-		id, err := reader.OIDAt(parentPos)
-		if err != nil {
-			tb.Fatalf("OIDAt(extra parent %+v): %v", parentPos, err)
-		}
-
-		out = append(out, id)
-	}
-
-	return out
-}
-
-func assertChangedPathsBloomPositive(tb testing.TB, testRepo *testgit.TestRepo, filter bloom.Filter, commitID objectid.ObjectID) {
-	tb.Helper()
-
-	changedPaths := testRepo.Run(tb, "diff-tree", "--no-commit-id", "--name-only", "-r", "--root", commitID.String())
-	for line := range strings.SplitSeq(strings.TrimSpace(changedPaths), "\n") {
-		path := strings.TrimSpace(line)
-		if path == "" {
-			continue
-		}
-
-		mightContain, err := filter.MightContain([]byte(path))
-		if err != nil {
-			tb.Fatalf("MightContain(%q): %v", path, err)
-		}
-
-		if !mightContain {
-			tb.Fatalf("Bloom filter false negative for commit %s path %q", commitID, path)
-		}
-	}
-}
-
-func parseOIDLine(tb testing.TB, algo objectid.Algorithm, line string) []objectid.ObjectID {
-	tb.Helper()
-
-	toks := strings.Fields(line)
-
-	out := make([]objectid.ObjectID, 0, len(toks))
-	for _, tok := range toks {
-		id, err := objectid.ParseHex(algo, tok)
-		if err != nil {
-			tb.Fatalf("parse object id %q: %v", tok, err)
-		}
-
-		out = append(out, id)
-	}
-
-	return out
-}
diff --git a/commitgraph/read/reader.go b/commitgraph/read/reader.go
deleted file mode 100644
index d5c84a70..00000000
--- a/commitgraph/read/reader.go
+++ /dev/null
@@ -1,16 +0,0 @@
-package read
-
-import objectid "codeberg.org/lindenii/furgit/object/id"
-
-// Reader provides read-only access to one mmap-backed commit-graph snapshot.
-//
-// It is safe for concurrent read-only queries.
-// Values returned by Reader methods are only valid until the reader is closed
-// when explicitly documented on that method.
-type Reader struct {
-	algo        objectid.Algorithm
-	hashVersion uint8
-
-	layers []layer
-	total  uint32
-}
diff --git a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/HEAD b/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/HEAD
deleted file mode 100644
index cb089cd8..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/HEAD
+++ /dev/null
@@ -1 +0,0 @@
-ref: refs/heads/master
diff --git a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/config b/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/config
deleted file mode 100644
index 07d359d0..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/config
+++ /dev/null
@@ -1,4 +0,0 @@
-[core]
-	repositoryformatversion = 0
-	filemode = true
-	bare = true
diff --git a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/info/commit-graphs/commit-graph-chain b/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/info/commit-graphs/commit-graph-chain
deleted file mode 100644
index 74c46b64..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/info/commit-graphs/commit-graph-chain
+++ /dev/null
@@ -1,2 +0,0 @@
-dd7578d5216ca76c25b19631ba90f7498aeabbe7
-bf985c21612a52070d8b008e6ef51edf8b609401
diff --git a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/info/commit-graphs/graph-bf985c21612a52070d8b008e6ef51edf8b609401.graph b/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/info/commit-graphs/graph-bf985c21612a52070d8b008e6ef51edf8b609401.graph
deleted file mode 100644
index c31869c1..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/info/commit-graphs/graph-bf985c21612a52070d8b008e6ef51edf8b609401.graph
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/info/commit-graphs/graph-dd7578d5216ca76c25b19631ba90f7498aeabbe7.graph b/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/info/commit-graphs/graph-dd7578d5216ca76c25b19631ba90f7498aeabbe7.graph
deleted file mode 100644
index 241eb3cc..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/info/commit-graphs/graph-dd7578d5216ca76c25b19631ba90f7498aeabbe7.graph
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/info/packs b/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/info/packs
deleted file mode 100644
index 61decf9b..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/info/packs
+++ /dev/null
@@ -1,2 +0,0 @@
-P pack-15b064d6a8ef8cff520565f6db8c006b2e6f7f2f.pack
-
diff --git a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/pack/pack-15b064d6a8ef8cff520565f6db8c006b2e6f7f2f.bitmap b/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/pack/pack-15b064d6a8ef8cff520565f6db8c006b2e6f7f2f.bitmap
deleted file mode 100644
index 1508cf18..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/pack/pack-15b064d6a8ef8cff520565f6db8c006b2e6f7f2f.bitmap
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/pack/pack-15b064d6a8ef8cff520565f6db8c006b2e6f7f2f.idx b/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/pack/pack-15b064d6a8ef8cff520565f6db8c006b2e6f7f2f.idx
deleted file mode 100644
index 00ee2646..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/pack/pack-15b064d6a8ef8cff520565f6db8c006b2e6f7f2f.idx
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/pack/pack-15b064d6a8ef8cff520565f6db8c006b2e6f7f2f.pack b/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/pack/pack-15b064d6a8ef8cff520565f6db8c006b2e6f7f2f.pack
deleted file mode 100644
index c65ae27f..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/pack/pack-15b064d6a8ef8cff520565f6db8c006b2e6f7f2f.pack
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/pack/pack-15b064d6a8ef8cff520565f6db8c006b2e6f7f2f.rev b/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/pack/pack-15b064d6a8ef8cff520565f6db8c006b2e6f7f2f.rev
deleted file mode 100644
index d0689f72..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/objects/pack/pack-15b064d6a8ef8cff520565f6db8c006b2e6f7f2f.rev
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/refs/heads/master b/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/refs/heads/master
deleted file mode 100644
index 8942d437..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/chain_changed/repo.git/refs/heads/master
+++ /dev/null
@@ -1 +0,0 @@
-46ca641fd65e566b8ecfa567a1f01766289192f8
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/HEAD b/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/HEAD
deleted file mode 100644
index b870d826..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/HEAD
+++ /dev/null
@@ -1 +0,0 @@
-ref: refs/heads/main
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/config b/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/config
deleted file mode 100644
index 07d359d0..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/config
+++ /dev/null
@@ -1,4 +0,0 @@
-[core]
-	repositoryformatversion = 0
-	filemode = true
-	bare = true
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/info/commit-graph b/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/info/commit-graph
deleted file mode 100644
index 56b59a54..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/info/commit-graph
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/info/packs b/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/info/packs
deleted file mode 100644
index ecf5d272..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/info/packs
+++ /dev/null
@@ -1,2 +0,0 @@
-P pack-34e9e132566989e2abfe8821731236c77f9bcbe9.pack
-
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/pack/pack-34e9e132566989e2abfe8821731236c77f9bcbe9.bitmap b/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/pack/pack-34e9e132566989e2abfe8821731236c77f9bcbe9.bitmap
deleted file mode 100644
index 9fec7b16..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/pack/pack-34e9e132566989e2abfe8821731236c77f9bcbe9.bitmap
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/pack/pack-34e9e132566989e2abfe8821731236c77f9bcbe9.idx b/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/pack/pack-34e9e132566989e2abfe8821731236c77f9bcbe9.idx
deleted file mode 100644
index e30cbb5a..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/pack/pack-34e9e132566989e2abfe8821731236c77f9bcbe9.idx
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/pack/pack-34e9e132566989e2abfe8821731236c77f9bcbe9.pack b/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/pack/pack-34e9e132566989e2abfe8821731236c77f9bcbe9.pack
deleted file mode 100644
index 8da45eab..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/pack/pack-34e9e132566989e2abfe8821731236c77f9bcbe9.pack
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/pack/pack-34e9e132566989e2abfe8821731236c77f9bcbe9.rev b/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/pack/pack-34e9e132566989e2abfe8821731236c77f9bcbe9.rev
deleted file mode 100644
index 3bcd2e2c..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/objects/pack/pack-34e9e132566989e2abfe8821731236c77f9bcbe9.rev
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/refs/heads/main b/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/refs/heads/main
deleted file mode 100644
index 090ca933..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_changed/repo.git/refs/heads/main
+++ /dev/null
@@ -1 +0,0 @@
-d02a8dbd1a8fbaac8ab7f7f1533cc312ab2c9eec
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/HEAD b/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/HEAD
deleted file mode 100644
index cb089cd8..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/HEAD
+++ /dev/null
@@ -1 +0,0 @@
-ref: refs/heads/master
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/config b/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/config
deleted file mode 100644
index 07d359d0..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/config
+++ /dev/null
@@ -1,4 +0,0 @@
-[core]
-	repositoryformatversion = 0
-	filemode = true
-	bare = true
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/info/commit-graph b/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/info/commit-graph
deleted file mode 100644
index 28f7d06a..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/info/commit-graph
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/info/packs b/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/info/packs
deleted file mode 100644
index 8434a002..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/info/packs
+++ /dev/null
@@ -1,2 +0,0 @@
-P pack-a3da595034c94bb16b6829d757a66b7d259b9ffc.pack
-
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/pack/pack-a3da595034c94bb16b6829d757a66b7d259b9ffc.bitmap b/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/pack/pack-a3da595034c94bb16b6829d757a66b7d259b9ffc.bitmap
deleted file mode 100644
index 64a36c71..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/pack/pack-a3da595034c94bb16b6829d757a66b7d259b9ffc.bitmap
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/pack/pack-a3da595034c94bb16b6829d757a66b7d259b9ffc.idx b/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/pack/pack-a3da595034c94bb16b6829d757a66b7d259b9ffc.idx
deleted file mode 100644
index f5e16674..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/pack/pack-a3da595034c94bb16b6829d757a66b7d259b9ffc.idx
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/pack/pack-a3da595034c94bb16b6829d757a66b7d259b9ffc.pack b/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/pack/pack-a3da595034c94bb16b6829d757a66b7d259b9ffc.pack
deleted file mode 100644
index 8f82b451..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/pack/pack-a3da595034c94bb16b6829d757a66b7d259b9ffc.pack
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/pack/pack-a3da595034c94bb16b6829d757a66b7d259b9ffc.rev b/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/pack/pack-a3da595034c94bb16b6829d757a66b7d259b9ffc.rev
deleted file mode 100644
index 64771f70..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/objects/pack/pack-a3da595034c94bb16b6829d757a66b7d259b9ffc.rev
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/refs/heads/master b/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/refs/heads/master
deleted file mode 100644
index 475cb2c1..00000000
--- a/commitgraph/read/testdata/fixtures/sha1/single_nochanged/repo.git/refs/heads/master
+++ /dev/null
@@ -1 +0,0 @@
-dda8217252bdf3e01fdf31309d0e5c3051b00945
diff --git a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/HEAD b/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/HEAD
deleted file mode 100644
index cb089cd8..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/HEAD
+++ /dev/null
@@ -1 +0,0 @@
-ref: refs/heads/master
diff --git a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/config b/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/config
deleted file mode 100644
index 7d1c0006..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/config
+++ /dev/null
@@ -1,6 +0,0 @@
-[extensions]
-	objectformat = sha256
-[core]
-	repositoryformatversion = 1
-	filemode = true
-	bare = true
diff --git a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/info/commit-graphs/commit-graph-chain b/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/info/commit-graphs/commit-graph-chain
deleted file mode 100644
index 4e7d76fe..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/info/commit-graphs/commit-graph-chain
+++ /dev/null
@@ -1,2 +0,0 @@
-505cab61f8ddfa614301e8f97943112739236c6bcd19ed4d1f7c6b830cab4f62
-77c47bd6ca2ce17208c9361717a5823c0cb4b5ee336a14959678e060d674ffb6
diff --git a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/info/commit-graphs/graph-505cab61f8ddfa614301e8f97943112739236c6bcd19ed4d1f7c6b830cab4f62.graph b/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/info/commit-graphs/graph-505cab61f8ddfa614301e8f97943112739236c6bcd19ed4d1f7c6b830cab4f62.graph
deleted file mode 100644
index 4a93de94..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/info/commit-graphs/graph-505cab61f8ddfa614301e8f97943112739236c6bcd19ed4d1f7c6b830cab4f62.graph
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/info/commit-graphs/graph-77c47bd6ca2ce17208c9361717a5823c0cb4b5ee336a14959678e060d674ffb6.graph b/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/info/commit-graphs/graph-77c47bd6ca2ce17208c9361717a5823c0cb4b5ee336a14959678e060d674ffb6.graph
deleted file mode 100644
index 7807351d..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/info/commit-graphs/graph-77c47bd6ca2ce17208c9361717a5823c0cb4b5ee336a14959678e060d674ffb6.graph
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/info/packs b/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/info/packs
deleted file mode 100644
index 3b1241c4..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/info/packs
+++ /dev/null
@@ -1,2 +0,0 @@
-P pack-04168d0884c910f505cb9fbcf045957e44ccee06d812b5e531ae666014a26ed1.pack
-
diff --git a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/pack/pack-04168d0884c910f505cb9fbcf045957e44ccee06d812b5e531ae666014a26ed1.bitmap b/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/pack/pack-04168d0884c910f505cb9fbcf045957e44ccee06d812b5e531ae666014a26ed1.bitmap
deleted file mode 100644
index 007fcd0e..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/pack/pack-04168d0884c910f505cb9fbcf045957e44ccee06d812b5e531ae666014a26ed1.bitmap
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/pack/pack-04168d0884c910f505cb9fbcf045957e44ccee06d812b5e531ae666014a26ed1.idx b/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/pack/pack-04168d0884c910f505cb9fbcf045957e44ccee06d812b5e531ae666014a26ed1.idx
deleted file mode 100644
index 248cf8fc..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/pack/pack-04168d0884c910f505cb9fbcf045957e44ccee06d812b5e531ae666014a26ed1.idx
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/pack/pack-04168d0884c910f505cb9fbcf045957e44ccee06d812b5e531ae666014a26ed1.pack b/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/pack/pack-04168d0884c910f505cb9fbcf045957e44ccee06d812b5e531ae666014a26ed1.pack
deleted file mode 100644
index 92cea7fb..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/pack/pack-04168d0884c910f505cb9fbcf045957e44ccee06d812b5e531ae666014a26ed1.pack
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/pack/pack-04168d0884c910f505cb9fbcf045957e44ccee06d812b5e531ae666014a26ed1.rev b/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/pack/pack-04168d0884c910f505cb9fbcf045957e44ccee06d812b5e531ae666014a26ed1.rev
deleted file mode 100644
index 569862ce..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/objects/pack/pack-04168d0884c910f505cb9fbcf045957e44ccee06d812b5e531ae666014a26ed1.rev
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/refs/heads/master b/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/refs/heads/master
deleted file mode 100644
index 29d83be8..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/chain_changed/repo.git/refs/heads/master
+++ /dev/null
@@ -1 +0,0 @@
-10d2943dc7ad88011cae3b776d9565d6451a350ce1d16949bc8546a5fe6c0a53
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/HEAD b/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/HEAD
deleted file mode 100644
index b870d826..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/HEAD
+++ /dev/null
@@ -1 +0,0 @@
-ref: refs/heads/main
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/config b/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/config
deleted file mode 100644
index 7d1c0006..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/config
+++ /dev/null
@@ -1,6 +0,0 @@
-[extensions]
-	objectformat = sha256
-[core]
-	repositoryformatversion = 1
-	filemode = true
-	bare = true
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/info/commit-graph b/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/info/commit-graph
deleted file mode 100644
index f4dd0e0c..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/info/commit-graph
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/info/packs b/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/info/packs
deleted file mode 100644
index 0f39ed89..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/info/packs
+++ /dev/null
@@ -1,2 +0,0 @@
-P pack-316dbc67dac12d131591640da0c55b76387cbf1fd2a117ab3d7ca0d854a031c9.pack
-
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/pack/pack-316dbc67dac12d131591640da0c55b76387cbf1fd2a117ab3d7ca0d854a031c9.bitmap b/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/pack/pack-316dbc67dac12d131591640da0c55b76387cbf1fd2a117ab3d7ca0d854a031c9.bitmap
deleted file mode 100644
index b5c5055c..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/pack/pack-316dbc67dac12d131591640da0c55b76387cbf1fd2a117ab3d7ca0d854a031c9.bitmap
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/pack/pack-316dbc67dac12d131591640da0c55b76387cbf1fd2a117ab3d7ca0d854a031c9.idx b/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/pack/pack-316dbc67dac12d131591640da0c55b76387cbf1fd2a117ab3d7ca0d854a031c9.idx
deleted file mode 100644
index 144778cd..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/pack/pack-316dbc67dac12d131591640da0c55b76387cbf1fd2a117ab3d7ca0d854a031c9.idx
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/pack/pack-316dbc67dac12d131591640da0c55b76387cbf1fd2a117ab3d7ca0d854a031c9.pack b/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/pack/pack-316dbc67dac12d131591640da0c55b76387cbf1fd2a117ab3d7ca0d854a031c9.pack
deleted file mode 100644
index 599ccae0..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/pack/pack-316dbc67dac12d131591640da0c55b76387cbf1fd2a117ab3d7ca0d854a031c9.pack
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/pack/pack-316dbc67dac12d131591640da0c55b76387cbf1fd2a117ab3d7ca0d854a031c9.rev b/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/pack/pack-316dbc67dac12d131591640da0c55b76387cbf1fd2a117ab3d7ca0d854a031c9.rev
deleted file mode 100644
index 3c093f31..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/objects/pack/pack-316dbc67dac12d131591640da0c55b76387cbf1fd2a117ab3d7ca0d854a031c9.rev
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/refs/heads/main b/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/refs/heads/main
deleted file mode 100644
index 4ba32358..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_changed/repo.git/refs/heads/main
+++ /dev/null
@@ -1 +0,0 @@
-a9ff114900e6be139ec66a2a61c930973d8c4bc6fd3b899405ee7ab8740bdbd3
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/HEAD b/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/HEAD
deleted file mode 100644
index cb089cd8..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/HEAD
+++ /dev/null
@@ -1 +0,0 @@
-ref: refs/heads/master
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/config b/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/config
deleted file mode 100644
index 7d1c0006..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/config
+++ /dev/null
@@ -1,6 +0,0 @@
-[extensions]
-	objectformat = sha256
-[core]
-	repositoryformatversion = 1
-	filemode = true
-	bare = true
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/info/commit-graph b/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/info/commit-graph
deleted file mode 100644
index f98ca4a1..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/info/commit-graph
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/info/packs b/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/info/packs
deleted file mode 100644
index 65184c9a..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/info/packs
+++ /dev/null
@@ -1,2 +0,0 @@
-P pack-d335453f760b064e36459d780ec9bf0e5dd596c0ee1ac6310136067c4f13438b.pack
-
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/pack/pack-d335453f760b064e36459d780ec9bf0e5dd596c0ee1ac6310136067c4f13438b.bitmap b/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/pack/pack-d335453f760b064e36459d780ec9bf0e5dd596c0ee1ac6310136067c4f13438b.bitmap
deleted file mode 100644
index 53530f4c..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/pack/pack-d335453f760b064e36459d780ec9bf0e5dd596c0ee1ac6310136067c4f13438b.bitmap
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/pack/pack-d335453f760b064e36459d780ec9bf0e5dd596c0ee1ac6310136067c4f13438b.idx b/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/pack/pack-d335453f760b064e36459d780ec9bf0e5dd596c0ee1ac6310136067c4f13438b.idx
deleted file mode 100644
index b3a417a8..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/pack/pack-d335453f760b064e36459d780ec9bf0e5dd596c0ee1ac6310136067c4f13438b.idx
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/pack/pack-d335453f760b064e36459d780ec9bf0e5dd596c0ee1ac6310136067c4f13438b.pack b/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/pack/pack-d335453f760b064e36459d780ec9bf0e5dd596c0ee1ac6310136067c4f13438b.pack
deleted file mode 100644
index d8dcedbf..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/pack/pack-d335453f760b064e36459d780ec9bf0e5dd596c0ee1ac6310136067c4f13438b.pack
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/pack/pack-d335453f760b064e36459d780ec9bf0e5dd596c0ee1ac6310136067c4f13438b.rev b/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/pack/pack-d335453f760b064e36459d780ec9bf0e5dd596c0ee1ac6310136067c4f13438b.rev
deleted file mode 100644
index e50d1a81..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/objects/pack/pack-d335453f760b064e36459d780ec9bf0e5dd596c0ee1ac6310136067c4f13438b.rev
+++ /dev/null
diff --git a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/refs/heads/master b/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/refs/heads/master
deleted file mode 100644
index a4e184b4..00000000
--- a/commitgraph/read/testdata/fixtures/sha256/single_nochanged/repo.git/refs/heads/master
+++ /dev/null
@@ -1 +0,0 @@
-7e396bf648e3b045c293d9fbdc533d4377d4e801d5d1fb57b84d22dd054a5860