Revert "Remove spurious Peek. A partial Peek can ruin the header read."

Brian Ollenberger · Brian Ollenberger · commit e81a438d199d · 2025-11-17T18:31:35.000-08:00
This reverts commit ea0c0f7.
diff --git a/v2.go b/v2.go
@@ -108,6 +108,10 @@ func parseVersion2(reader *bufio.Reader) (header *Header, err error) {
 		return header, nil
 	}
 
+	if _, err := reader.Peek(int(length)); err != nil {
+		return nil, fmt.Errorf("%w: %w", ErrInvalidLength, err)
+	}
+
 	// Length-limited reader for payload section
 	payloadReader := io.LimitReader(reader, int64(length)).(*io.LimitedReader)
 

Original file line number	Diff line number	Diff line change
`@@ -108,6 +108,10 @@ func parseVersion2(reader bufio.Reader) (header Header, err error) {`
`108`	`108`	`return header, nil`
`109`	`109`	`}`
`110`	`110`
	`111`	`+ if _, err := reader.Peek(int(length)); err != nil {`
	`112`	`+ return nil, fmt.Errorf("%w: %w", ErrInvalidLength, err)`
	`113`	`+ }`
	`114`	`+`
`111`	`115`	`// Length-limited reader for payload section`
`112`	`116`	`payloadReader := io.LimitReader(reader, int64(length)).(*io.LimitedReader)`
`113`	`117`