zlib, flatex: Remove code related to dicts

Git never uses them

1 files changed, 3 insertions, 31 deletions

diff --git a/internal/zlibx/decompress.go b/internal/zlibx/decompress.go
index 68a92587..df4a34be 100644
--- a/internal/zlibx/decompress.go
+++ b/internal/zlibx/decompress.go
@@ -9,28 +9,11 @@ import (
 	"git.sr.ht/~runxiyu/furgit/internal/flatex"
 )
 
-// Decompress inflates the provided zlib wrapped stream and returns the
-// uncompressed data inside a pooled bufpool.Buffer.
 func Decompress(src []byte) (*bufpool.Buffer, error) {
 	return DecompressSized(src, 0)
 }
 
-// DecompressSized inflates the provided zlib stream, using sizeHint to
-// preallocate the output buffer when known (e.g. packfile entries).
 func DecompressSized(src []byte, sizeHint int) (*bufpool.Buffer, error) {
-	return DecompressDictSized(src, nil, sizeHint)
-}
-
-// DecompressDict is like Decompress but accepts a preset dictionary. The
-// dictionary must match the checksum embedded in the stream if the dictionary
-// flag is present.
-func DecompressDict(src []byte, dict []byte) (*bufpool.Buffer, error) {
-	return DecompressDictSized(src, dict, 0)
-}
-
-// DecompressDictSized is like DecompressDict but allows providing an expected
-// uncompressed size to avoid buffer growth copies.
-func DecompressDictSized(src []byte, dict []byte, sizeHint int) (*bufpool.Buffer, error) {
 	if len(src) < 6 {
 		return nil, io.ErrUnexpectedEOF
 	}
@@ -42,19 +25,8 @@ func DecompressDictSized(src []byte, dict []byte, sizeHint int) (*bufpool.Buffer
 	}
 
 	offset := 2
-	haveDict := flg&0x20 != 0
-	if haveDict {
-		if len(src) < offset+4 {
-			return nil, io.ErrUnexpectedEOF
-		}
-		if dict == nil {
-			return nil, ErrDictionary
-		}
-		checksum := binary.BigEndian.Uint32(src[offset : offset+4])
-		if checksum != adler32.Checksum(dict) {
-			return nil, ErrDictionary
-		}
-		offset += 4
+	if flg&0x20 != 0 {
+		return nil, ErrHeader
 	}
 
 	if len(src[offset:]) < 4 {
@@ -62,7 +34,7 @@ func DecompressDictSized(src []byte, dict []byte, sizeHint int) (*bufpool.Buffer
 	}
 
 	deflateData := src[offset:]
-	out, consumed, err := flatex.DecompressDictSized(deflateData, dict, sizeHint)
+	out, consumed, err := flatex.DecompressSized(deflateData, sizeHint)
 	if err != nil {
 		return nil, err
 	}