From 96051aae4e41df836f956926ed57310f8dad4a5f Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Thu, 18 Aug 2022 02:37:23 -0600
Subject: Have ExtentCSum use SumRun

---
 lib/btrfs/btrfsitem/item_extentcsum.go | 53 ++++------------------------------
 1 file changed, 5 insertions(+), 48 deletions(-)

(limited to 'lib/btrfs/btrfsitem/item_extentcsum.go')

diff --git a/lib/btrfs/btrfsitem/item_extentcsum.go b/lib/btrfs/btrfsitem/item_extentcsum.go
index 18ee572..bcfe334 100644
--- a/lib/btrfs/btrfsitem/item_extentcsum.go
+++ b/lib/btrfs/btrfsitem/item_extentcsum.go
@@ -5,73 +5,30 @@
 package btrfsitem
 
 import (
-	"encoding/hex"
 	"fmt"
-	"io"
-
-	"git.lukeshu.com/go/lowmemjson"
 
 	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfssum"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
 )
 
 // key.objectid = BTRFS_EXTENT_CSUM_OBJECTID
 // key.offset = laddr of checksummed region
 type ExtentCSum struct { // EXTENT_CSUM=128
-	ChecksumSize int
 	// Checksum of each sector starting at key.offset
-	Sums []btrfssum.CSum
+	btrfssum.SumRun[btrfsvol.LogicalAddr]
 }
 
 func (o *ExtentCSum) UnmarshalBinary(dat []byte) (int, error) {
 	if o.ChecksumSize == 0 {
 		return 0, fmt.Errorf(".ChecksumSize must be set")
 	}
-	for len(dat) >= o.ChecksumSize {
-		var csum btrfssum.CSum
-		copy(csum[:], dat[:o.ChecksumSize])
-		dat = dat[o.ChecksumSize:]
-		o.Sums = append(o.Sums, csum)
-	}
-	return len(o.Sums) * o.ChecksumSize, nil
+	o.Sums = btrfssum.ShortSum(dat)
+	return len(dat), nil
 }
 
 func (o ExtentCSum) MarshalBinary() ([]byte, error) {
 	if o.ChecksumSize == 0 {
 		return nil, fmt.Errorf(".ChecksumSize must be set")
 	}
-	var dat []byte
-	for _, csum := range o.Sums {
-		dat = append(dat, csum[:o.ChecksumSize]...)
-	}
-	return dat, nil
-}
-
-var (
-	_ lowmemjson.Encodable = ExtentCSum{}
-)
-
-func (o ExtentCSum) EncodeJSON(w io.Writer) error {
-	if _, err := fmt.Fprintf(w, `{"ChecksumSize":%d,"Sums":[`, o.ChecksumSize); err != nil {
-		return err
-	}
-	for i, sum := range o.Sums {
-		if i > 0 {
-			if _, err := w.Write([]byte(",")); err != nil {
-				return err
-			}
-		}
-		if _, err := w.Write([]byte(`"`)); err != nil {
-			return err
-		}
-		if _, err := hex.NewEncoder(w).Write(sum[:o.ChecksumSize]); err != nil {
-			return err
-		}
-		if _, err := w.Write([]byte(`"`)); err != nil {
-			return err
-		}
-	}
-	if _, err := w.Write([]byte(`]}`)); err != nil {
-		return err
-	}
-	return nil
+	return []byte(o.Sums), nil
 }
-- 
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