// transforms the page tree from the file into an array of pages
func getPages(file *pdf.File, ref pdf.ObjectReference) []pdf.Dictionary {
pages := []pdf.Dictionary{}
pageNode := file.Get(ref).(pdf.Dictionary)
switch pageNode["Type"] {
case pdf.Name("Pages"):
for _, kidRef := range pageNode["Kids"].(pdf.Array) {
kidPages := getPages(file, kidRef.(pdf.ObjectReference))
pages = append(pages, kidPages...)
file.Free(kidRef.(pdf.ObjectReference).ObjectNumber)
}
case pdf.Name("Page"):
pages = append(pages, pageNode)
file.Free(ref.ObjectNumber)
default:
panic(string(pageNode["Type"].(pdf.Name)))
}
return pages
}
