Correctly manage partial writes

mtglib/internal/obfuscated2/pools.go

@@ -1,16 +1,24 @@
 package obfuscated2
 
 import (
+	"bytes"
 	"crypto/sha256"
 	"hash"
 	"sync"
 )
 
-var sha256HasherPool = sync.Pool{
-	New: func() interface{} {
-		return sha256.New()
-	},
-}
+var (
+	sha256HasherPool = sync.Pool{
+		New: func() interface{} {
+			return sha256.New()
+		},
+	}
+	bytesBufferPool = sync.Pool{
+		New: func() interface{} {
+			return &bytes.Buffer{}
+		},
+	}
+)
 
 func acquireSha256Hasher() hash.Hash {
 	return sha256HasherPool.Get().(hash.Hash)
@@ -20,3 +28,12 @@ func releaseSha256Hasher(h hash.Hash) {
 	h.Reset()
 	sha256HasherPool.Put(h)
 }
+
+func acquireBytesBuffer() *bytes.Buffer {
+	return bytesBufferPool.Get().(*bytes.Buffer)
+}
+
+func releaseBytesBuffer(buf *bytes.Buffer) {
+	buf.Reset()
+	bytesBufferPool.Put(buf)
+}