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Go: improve error handling

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This commit is contained in:
Přemysl Eric Janouch 2021-12-08 20:49:06 +01:00
parent bcb24af926
commit d8171b9ac4
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 6 additions and 5 deletions
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11
pdf/pdf.go
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@ -766,8 +766,6 @@ func (u *Updater) Version(root *Object) int {
// Get retrieves an object by its number and generation--may return
// Nil or End with an error.
//
// TODO(p): We should fix all uses of this not to eat the error.
func (u *Updater) Get(n, generation uint) (Object, error) {
if n >= u.xrefSize {
return New(Nil), nil
@ -907,8 +905,8 @@ func NewDate(ts time.Time) Object {
// GetFirstPage retrieves the first page of the given page (sub)tree reference,
// or returns a Nil object if unsuccessful.
func (u *Updater) GetFirstPage(nodeN, nodeGeneration uint) Object {
obj, _ := u.Get(nodeN, nodeGeneration)
if obj.Kind != Dict {
obj, err := u.Get(nodeN, nodeGeneration)
if err != nil || obj.Kind != Dict {
return New(Nil)
}
@ -1128,7 +1126,10 @@ func Sign(document []byte, key crypto.PrivateKey, certs []*x509.Certificate,
if !ok || rootRef.Kind != Reference {
return nil, errors.New("trailer does not contain a reference to Root")
}
root, _ := pdf.Get(rootRef.N, rootRef.Generation)
root, err := pdf.Get(rootRef.N, rootRef.Generation)
if err != nil {
return nil, fmt.Errorf("Root dictionary retrieval failed: %s", err)
}
if root.Kind != Dict {
return nil, errors.New("invalid Root dictionary reference")
}