*: Remove

8 files changed, 0 insertions, 377 deletions

diff --git a/format/packfile/delta/apply/apply.go b/format/packfile/delta/apply/apply.go
deleted file mode 100644
index f5006e3c..00000000
--- a/format/packfile/delta/apply/apply.go
+++ /dev/null
@@ -1,160 +0,0 @@
-// Package apply applies Git delta instruction streams.
-package apply
-
-import "fmt"
-
-// Apply applies one Git delta instruction stream to base.
-func Apply(base, delta []byte) ([]byte, error) {
-	pos := 0
-
-	srcSize, err := readVarint(delta, &pos)
-	if err != nil {
-		return nil, err
-	}
-
-	dstSize, err := readVarint(delta, &pos)
-	if err != nil {
-		return nil, err
-	}
-
-	if srcSize != len(base) {
-		return nil, fmt.Errorf("delta/apply: delta source size mismatch: got %d want %d", srcSize, len(base))
-	}
-
-	out := make([]byte, dstSize)
-	outPos := 0
-
-	for pos < len(delta) {
-		op := delta[pos]
-		pos++
-
-		//nolint:nestif
-		if op&0x80 != 0 {
-			off := 0
-
-			if op&0x01 != 0 {
-				if pos >= len(delta) {
-					return nil, fmt.Errorf("delta/apply: malformed delta copy offset")
-				}
-
-				off |= int(delta[pos])
-				pos++
-			}
-
-			if op&0x02 != 0 {
-				if pos >= len(delta) {
-					return nil, fmt.Errorf("delta/apply: malformed delta copy offset")
-				}
-
-				off |= int(delta[pos]) << 8
-				pos++
-			}
-
-			if op&0x04 != 0 {
-				if pos >= len(delta) {
-					return nil, fmt.Errorf("delta/apply: malformed delta copy offset")
-				}
-
-				off |= int(delta[pos]) << 16
-				pos++
-			}
-
-			if op&0x08 != 0 {
-				if pos >= len(delta) {
-					return nil, fmt.Errorf("delta/apply: malformed delta copy offset")
-				}
-
-				off |= int(delta[pos]) << 24
-				pos++
-			}
-
-			n := 0
-
-			if op&0x10 != 0 {
-				if pos >= len(delta) {
-					return nil, fmt.Errorf("delta/apply: malformed delta copy size")
-				}
-
-				n |= int(delta[pos])
-				pos++
-			}
-
-			if op&0x20 != 0 {
-				if pos >= len(delta) {
-					return nil, fmt.Errorf("delta/apply: malformed delta copy size")
-				}
-
-				n |= int(delta[pos]) << 8
-				pos++
-			}
-
-			if op&0x40 != 0 {
-				if pos >= len(delta) {
-					return nil, fmt.Errorf("delta/apply: malformed delta copy size")
-				}
-
-				n |= int(delta[pos]) << 16
-				pos++
-			}
-
-			if n == 0 {
-				n = 0x10000
-			}
-
-			if off < 0 || n < 0 || off+n > len(base) || outPos+n > len(out) {
-				return nil, fmt.Errorf("delta/apply: delta copy out of bounds")
-			}
-
-			copy(out[outPos:outPos+n], base[off:off+n])
-			outPos += n
-
-			continue
-		}
-
-		if op == 0 {
-			return nil, fmt.Errorf("delta/apply: invalid delta opcode 0")
-		}
-
-		n := int(op)
-		if pos+n > len(delta) || outPos+n > len(out) {
-			return nil, fmt.Errorf("delta/apply: delta insert out of bounds")
-		}
-
-		copy(out[outPos:outPos+n], delta[pos:pos+n])
-		outPos += n
-		pos += n
-	}
-
-	if outPos != len(out) {
-		return nil, fmt.Errorf("delta/apply: delta output size mismatch: got %d want %d", outPos, len(out))
-	}
-
-	return out, nil
-}
-
-// readVarint parses one Git delta varint and advances pos.
-func readVarint(buf []byte, pos *int) (int, error) {
-	value := 0
-	shift := uint(0)
-
-	for {
-		if *pos >= len(buf) {
-			return 0, fmt.Errorf("delta/apply: malformed delta varint")
-		}
-
-		b := buf[*pos]
-		*pos++
-
-		value |= int(b&0x7f) << shift
-		if b&0x80 == 0 {
-			break
-		}
-
-		shift += 7
-		if shift > 63 {
-			return 0, fmt.Errorf("delta/apply: delta varint overflow")
-		}
-	}
-
-	return value, nil
-}
diff --git a/format/packfile/delta/apply/header.go b/format/packfile/delta/apply/header.go
deleted file mode 100644
index 69c9659a..00000000
--- a/format/packfile/delta/apply/header.go
+++ /dev/null
@@ -1,47 +0,0 @@
-package apply
-
-import (
-	"fmt"
-	"io"
-)
-
-// ReadHeaderSizes reads the first two varints in one inflated delta stream.
-//
-// Callers that continue reading the same stream should pass their own buffered
-// byte reader and keep using that same reader afterwards.
-func ReadHeaderSizes(reader io.ByteReader) (int, int, error) {
-	srcSize, err := readVarintFromByteReader(reader)
-	if err != nil {
-		return 0, 0, err
-	}
-
-	dstSize, err := readVarintFromByteReader(reader)
-	if err != nil {
-		return 0, 0, err
-	}
-
-	return srcSize, dstSize, nil
-}
-
-// readVarintFromByteReader parses one Git delta varint from reader.
-func readVarintFromByteReader(reader io.ByteReader) (int, error) {
-	value := 0
-	shift := uint(0)
-
-	for {
-		b, err := reader.ReadByte()
-		if err != nil {
-			return 0, fmt.Errorf("delta/apply: malformed delta varint: %w", err)
-		}
-
-		value |= int(b&0x7f) << shift
-		if b&0x80 == 0 {
-			return value, nil
-		}
-
-		shift += 7
-		if shift > 63 {
-			return 0, fmt.Errorf("delta/apply: delta varint overflow")
-		}
-	}
-}
diff --git a/format/packfile/delta/doc.go b/format/packfile/delta/doc.go
deleted file mode 100644
index f63c96a8..00000000
--- a/format/packfile/delta/doc.go
+++ /dev/null
@@ -1,2 +0,0 @@
-// Package delta provides various routines to handle Git delta compression.
-package delta
diff --git a/format/packfile/doc.go b/format/packfile/doc.go
deleted file mode 100644
index cd4aacfc..00000000
--- a/format/packfile/doc.go
+++ /dev/null
@@ -1,5 +0,0 @@
-// Package packfile provides Git packfile format parsing primitives.
-package packfile
-
-// TODO: This could probably be moved into object/store/packed when we get the pack ingestion semantics right?
-// Oh, wait, the other stores might still want pack constants like we provide here.
diff --git a/format/packfile/entry.go b/format/packfile/entry.go
deleted file mode 100644
index 0f9c7c8d..00000000
--- a/format/packfile/entry.go
+++ /dev/null
@@ -1,76 +0,0 @@
-package packfile
-
-import (
-	"fmt"
-
-	objecttype "codeberg.org/lindenii/furgit/object/type"
-)
-
-// Entry is one parsed pack entry prefix, including any delta base reference
-// data that appears before the compressed payload.
-type Entry struct {
-	// Type is the pack entry type.
-	Type objecttype.Type
-	// Size is the declared resulting object size.
-	Size int64
-	// DataOffset is the byte offset from the start of the entry to the zlib
-	// payload bytes.
-	DataOffset int
-	// RefBaseID is the referenced base object ID bytes for ref-delta entries.
-	RefBaseID []byte
-	// OfsBaseDistance is the backward distance for ofs-delta entries.
-	OfsBaseDistance uint64
-}
-
-// ParseEntry parses one full pack entry prefix from data.
-//
-// hashSize must match the hash algorithm size used by the pack/index.
-func ParseEntry(data []byte, hashSize int) (Entry, error) {
-	var zero Entry
-
-	header, err := ParseEntryHeader(data)
-	if err != nil {
-		return zero, err
-	}
-
-	entry := Entry{
-		Type:       header.Type,
-		Size:       header.Size,
-		DataOffset: header.HeaderSize,
-	}
-
-	switch entry.Type {
-	case objecttype.TypeCommit, objecttype.TypeTree, objecttype.TypeBlob, objecttype.TypeTag:
-		// Base object entries have no extra prefix fields.
-	case objecttype.TypeRefDelta:
-		if hashSize <= 0 {
-			return zero, fmt.Errorf("packfile: invalid hash size %d", hashSize)
-		}
-
-		end := entry.DataOffset + hashSize
-		if end > len(data) {
-			return zero, fmt.Errorf("packfile: truncated ref-delta base id")
-		}
-
-		entry.RefBaseID = data[entry.DataOffset:end]
-		entry.DataOffset = end
-	case objecttype.TypeOfsDelta:
-		dist, consumed, err := ParseOfsDeltaDistance(data[entry.DataOffset:])
-		if err != nil {
-			return zero, err
-		}
-
-		entry.OfsBaseDistance = dist
-		entry.DataOffset += consumed
-	case objecttype.TypeInvalid, objecttype.TypeFuture:
-		return zero, fmt.Errorf("packfile: unsupported object type %d", entry.Type)
-	default:
-		return zero, fmt.Errorf("packfile: unsupported object type %d", entry.Type)
-	}
-
-	if entry.DataOffset > len(data) {
-		return zero, fmt.Errorf("packfile: entry data offset out of bounds")
-	}
-
-	return entry, nil
-}
diff --git a/format/packfile/entry_header.go b/format/packfile/entry_header.go
deleted file mode 100644
index 05664268..00000000
--- a/format/packfile/entry_header.go
+++ /dev/null
@@ -1,52 +0,0 @@
-package packfile
-
-import (
-	"fmt"
-
-	objecttype "codeberg.org/lindenii/furgit/object/type"
-)
-
-// EntryHeader is one parsed pack entry header prefix.
-type EntryHeader struct {
-	// Type is the entry type tag from the first header byte.
-	Type objecttype.Type
-	// Size is the declared resulting object size.
-	Size int64
-	// HeaderSize is the number of bytes consumed by the type/size header.
-	HeaderSize int
-}
-
-// ParseEntryHeader parses one pack entry type/size header from data.
-func ParseEntryHeader(data []byte) (EntryHeader, error) {
-	var zero EntryHeader
-	if len(data) == 0 {
-		return zero, fmt.Errorf("packfile: truncated entry header")
-	}
-
-	first := data[0]
-	header := EntryHeader{
-		Type:       objecttype.Type((first >> 4) & 0x07),
-		Size:       int64(first & 0x0f),
-		HeaderSize: 1,
-	}
-
-	shift := uint(4)
-
-	b := first
-	for b&0x80 != 0 {
-		if header.HeaderSize >= len(data) {
-			return zero, fmt.Errorf("packfile: truncated entry header")
-		}
-
-		b = data[header.HeaderSize]
-		header.HeaderSize++
-		header.Size |= int64(b&0x7f) << shift
-		shift += 7
-	}
-
-	if header.Size < 0 {
-		return zero, fmt.Errorf("packfile: negative entry size")
-	}
-
-	return header, nil
-}
diff --git a/format/packfile/header.go b/format/packfile/header.go
deleted file mode 100644
index 5f4e4508..00000000
--- a/format/packfile/header.go
+++ /dev/null
@@ -1,9 +0,0 @@
-package packfile
-
-// Signature is the 4-byte "PACK" magic at the start of pack files.
-const Signature = 0x5041434b
-
-// SupportedVersion reports whether one pack version is supported.
-func SupportedVersion(version uint32) bool {
-	return version == 2 || version == 3
-}
diff --git a/format/packfile/ofs.go b/format/packfile/ofs.go
deleted file mode 100644
index 4992a506..00000000
--- a/format/packfile/ofs.go
+++ /dev/null
@@ -1,26 +0,0 @@
-package packfile
-
-import "fmt"
-
-// ParseOfsDeltaDistance parses one ofs-delta backward distance.
-func ParseOfsDeltaDistance(buf []byte) (uint64, int, error) {
-	if len(buf) == 0 {
-		return 0, 0, fmt.Errorf("packfile: malformed ofs-delta distance")
-	}
-
-	b := buf[0]
-	dist := uint64(b & 0x7f)
-
-	consumed := 1
-	for b&0x80 != 0 {
-		if consumed >= len(buf) {
-			return 0, 0, fmt.Errorf("packfile: malformed ofs-delta distance")
-		}
-
-		b = buf[consumed]
-		consumed++
-		dist = ((dist + 1) << 7) + uint64(b&0x7f)
-	}
-
-	return dist, consumed, nil
-}