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Enhance handling of PDF Contents in createIncPageUpdate to preserve stream structure

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This commit is contained in:
Paul van Brouwershaven
2025-05-12 11:08:51 +02:00
committed by Paul van Brouwershaven
parent 0f834debb7
commit 7feb03999b
1 changed files with 17 additions and 1 deletions
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18
sign/pdfvisualsignature.go
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@@ -128,9 +128,25 @@ func (context *SignContext) createIncPageUpdate(pageNumber, annot uint32) ([]byt
// TODO: Update digitorus/pdf to get raw values without resolving pointers // TODO: Update digitorus/pdf to get raw values without resolving pointers
for _, key := range page.Keys() { for _, key := range page.Keys() {
switch key { switch key {
case "Contents", "Parent": case "Parent":
ptr := page.Key(key).GetPtr() ptr := page.Key(key).GetPtr()
page_buffer.WriteString(fmt.Sprintf(" /%s %d 0 R\n", key, ptr.GetID())) page_buffer.WriteString(fmt.Sprintf(" /%s %d 0 R\n", key, ptr.GetID()))
case "Contents":
// Special handling for Contents - must preserve stream structure
contentsValue := page.Key(key)
if contentsValue.Kind() == pdf.Array {
// If Contents is an array, keep it as an array reference
page_buffer.WriteString(" /Contents [")
for i := 0; i < contentsValue.Len(); i++ {
ptr := contentsValue.Index(i).GetPtr()
page_buffer.WriteString(fmt.Sprintf(" %d 0 R", ptr.GetID()))
}
page_buffer.WriteString(" ]\n")
} else {
// If Contents is a single reference, keep it as a single reference
ptr := contentsValue.GetPtr()
page_buffer.WriteString(fmt.Sprintf(" /%s %d 0 R\n", key, ptr.GetID()))
}
case "Annots": case "Annots":
page_buffer.WriteString(" /Annots [\n") page_buffer.WriteString(" /Annots [\n")
for i := 0; i < page.Key("Annots").Len(); i++ { for i := 0; i < page.Key("Annots").Len(); i++ {