Tryanks/pdfsign
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Append instead of replace

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This commit is contained in:
Jeroen Bobbeldijk
2017-07-08 14:55:31 +02:00
parent 6d38be3f51
commit db69b6a4c0
9 changed files with 127 additions and 26 deletions
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15
sign/pdfxref.go
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@@ -22,7 +22,7 @@ func (context *SignContext) writeXref() error {
func (context *SignContext) writeXrefTable() error {
xref_size := "xref\n0 " + strconv.FormatInt(context.PDFReader.XrefInformation.ItemCount, 10)
new_xref_size := "xref\n0 " + strconv.FormatInt(context.PDFReader.XrefInformation.ItemCount+2, 10)
new_xref_size := "xref\n0 " + strconv.FormatInt(context.PDFReader.XrefInformation.ItemCount+3, 10)
if _, err := context.OutputFile.Write([]byte(new_xref_size)); err != nil {
return err
@@ -34,7 +34,16 @@ func (context *SignContext) writeXrefTable() error {
}
// Create the new catalog xref line.
catalog_object_start_position := strconv.FormatInt(context.PDFReader.XrefInformation.StartPos, 10)
visual_signature_object_start_position := strconv.FormatInt(context.Filesize, 10)
visual_signature_xref_line := leftPad(visual_signature_object_start_position, "0", 10-len(visual_signature_object_start_position)) + " 00000 n\n"
// Write the new catalog xref line.
if _, err := context.OutputFile.Write([]byte(visual_signature_xref_line)); err != nil {
return err
}
// Create the new catalog xref line.
catalog_object_start_position := strconv.FormatInt(context.Filesize+context.VisualSignData.Length, 10)
catalog_xref_line := leftPad(catalog_object_start_position, "0", 10-len(catalog_object_start_position)) + " 00000 n\n"
// Write the new catalog xref line.
@@ -43,7 +52,7 @@ func (context *SignContext) writeXrefTable() error {
}
// Create the new signature xref line.
signature_object_start_position := strconv.FormatInt(context.PDFReader.XrefInformation.StartPos+context.CatalogData.Length, 10)
signature_object_start_position := strconv.FormatInt(context.Filesize+context.VisualSignData.Length+context.CatalogData.Length, 10)
signature_xref_line := leftPad(signature_object_start_position, "0", 10-len(signature_object_start_position)) + " 00000 n\n"
// Write the new signature xref line.