encoder, reencoder: Distinguish between syntax errors and I/O errors

1 files changed, 24 insertions, 0 deletions

diff --git a/errors.go b/errors.go
index 0a47db4..516018c 100644
--- a/errors.go
+++ b/errors.go
@@ -121,6 +121,18 @@ func (e *DecodeError) Unwrap() error { return e.Err }
 
 // encode errors ///////////////////////////////////////////////////////////////////////////////////
 
+// A EncodeWriteError is returned from Encode if there is an error
+// writing to the output stream.
+type EncodeWriteError struct {
+	Err    error
+	Offset int64
+}
+
+func (e *EncodeWriteError) Error() string {
+	return fmt.Sprintf("json: I/O error at output byte %v: %v", e.Offset, e.Err)
+}
+func (e *EncodeWriteError) Unwrap() error { return e.Err }
+
 // An EncodeTypeError is returned by Encode when attempting to encode
 // an unsupported type.
 //
@@ -155,6 +167,18 @@ func (e *EncodeMethodError) Unwrap() error { return e.Err }
 
 // reencode errors /////////////////////////////////////////////////////////////////////////////////
 
+// A ReEncodeWriteError is returned from ReEncoder's methods if there
+// is an error writing to the output stream.
+type ReEncodeWriteError struct {
+	Err    error
+	Offset int64
+}
+
+func (e *ReEncodeWriteError) Error() string {
+	return fmt.Sprintf("json: I/O error at output byte %v: %v", e.Offset, e.Err)
+}
+func (e *ReEncodeWriteError) Unwrap() error { return e.Err }
+
 // A ReEncodeSyntaxError is returned from ReEncoder's methods if there
 // is a syntax error in the input.
 type ReEncodeSyntaxError struct {