aboutsummaryrefslogtreecommitdiff
path: root/pdf
diff options
context:
space:
mode:
Diffstat (limited to 'pdf')
-rw-r--r--pdf/pdf.go8
1 files changed, 5 insertions, 3 deletions
diff --git a/pdf/pdf.go b/pdf/pdf.go
index 17a4982..1616b0d 100644
--- a/pdf/pdf.go
+++ b/pdf/pdf.go
@@ -795,7 +795,8 @@ type BytesWriter interface {
WriteString(s string) (n int, err error)
}
-// Update appends an updated object to the end of the document.
+// Update appends an updated object to the end of the document. The fill
+// callback must write exactly one PDF object.
func (u *Updater) Update(n uint, fill func(buf BytesWriter)) {
oldRef := u.xref[n]
u.updated[n] = struct{}{}
@@ -880,7 +881,8 @@ func NewDate(ts time.Time) Object {
return NewString(string(buf))
}
-// GetFirstPage retrieves the first page of the document or a Nil 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 {
@@ -1126,7 +1128,7 @@ func Sign(document []byte,
buf.WriteString("\n /Contents <")
signOff = buf.Len()
- signLen = 8192 // cert, digest, encripted digest, ...
+ signLen = 8192 // cert, digest, encrypted digest, ...
buf.Write(bytes.Repeat([]byte{'0'}, signLen))
buf.WriteString("> >>")