*: format/pack -> packfile; format/delta -> delta; delete format

2 files changed, 0 insertions, 207 deletions

diff --git a/format/delta/apply/apply.go b/format/delta/apply/apply.go
deleted file mode 100644
index cd53f837..00000000
--- a/format/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("format/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("format/delta/apply: malformed delta copy offset")
-				}
-
-				off |= int(delta[pos])
-				pos++
-			}
-
-			if op&0x02 != 0 {
-				if pos >= len(delta) {
-					return nil, fmt.Errorf("format/delta/apply: malformed delta copy offset")
-				}
-
-				off |= int(delta[pos]) << 8
-				pos++
-			}
-
-			if op&0x04 != 0 {
-				if pos >= len(delta) {
-					return nil, fmt.Errorf("format/delta/apply: malformed delta copy offset")
-				}
-
-				off |= int(delta[pos]) << 16
-				pos++
-			}
-
-			if op&0x08 != 0 {
-				if pos >= len(delta) {
-					return nil, fmt.Errorf("format/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("format/delta/apply: malformed delta copy size")
-				}
-
-				n |= int(delta[pos])
-				pos++
-			}
-
-			if op&0x20 != 0 {
-				if pos >= len(delta) {
-					return nil, fmt.Errorf("format/delta/apply: malformed delta copy size")
-				}
-
-				n |= int(delta[pos]) << 8
-				pos++
-			}
-
-			if op&0x40 != 0 {
-				if pos >= len(delta) {
-					return nil, fmt.Errorf("format/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("format/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("format/delta/apply: invalid delta opcode 0")
-		}
-
-		n := int(op)
-		if pos+n > len(delta) || outPos+n > len(out) {
-			return nil, fmt.Errorf("format/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("format/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("format/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("format/delta/apply: delta varint overflow")
-		}
-	}
-
-	return value, nil
-}
diff --git a/format/delta/apply/header.go b/format/delta/apply/header.go
deleted file mode 100644
index dbd29550..00000000
--- a/format/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("format/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("format/delta/apply: delta varint overflow")
-		}
-	}
-}