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use crate::Result;
use crate::{Document, Object, ObjectId};
use std::collections::BTreeMap;
use std::fs::File;
use std::io::Write;
impl Document {
pub fn change_producer(&mut self, producer: &str) {
if let Ok(info) = self.trailer.get_mut(b"Info") {
if let Some(dict) = match *info {
Object::Dictionary(ref mut dict) => Some(dict),
Object::Reference(ref id) => self.objects.get_mut(id).and_then(|o| o.as_dict_mut().ok()),
_ => None,
} {
dict.set("Producer", Object::string_literal(producer));
}
}
}
pub fn compress(&mut self) {
for object in self.objects.values_mut() {
if let Object::Stream(ref mut stream) = *object {
if stream.allows_compression {
let _ = stream.compress();
}
}
}
}
pub fn decompress(&mut self) {
for object in self.objects.values_mut() {
if let Object::Stream(ref mut stream) = *object {
stream.decompress()
}
}
}
pub fn delete_pages(&mut self, page_numbers: &[u32]) {
let pages = self.get_pages();
for page_number in page_numbers {
if let Some(page) = pages.get(&page_number).and_then(|page_id| self.delete_object(*page_id)) {
let mut page_tree_ref = page
.as_dict()
.and_then(|dict| dict.get(b"Parent"))
.and_then(Object::as_reference);
while let Ok(page_tree_id) = page_tree_ref {
if let Some(page_tree) = self.objects.get_mut(&page_tree_id).and_then(|pt| pt.as_dict_mut().ok()) {
if let Ok(count) = page_tree.get(b"Count").and_then(Object::as_i64) {
page_tree.set("Count", count - 1);
}
page_tree_ref = page_tree.get(b"Parent").and_then(Object::as_reference);
} else {
break;
}
}
}
}
}
pub fn prune_objects(&mut self) -> Vec<ObjectId> {
let mut ids = vec![];
let refs = self.traverse_objects(|_| {});
for id in self.objects.keys() {
if !refs.contains(id) {
ids.push(*id);
}
}
for id in &ids {
self.objects.remove(id);
}
ids
}
pub fn delete_object(&mut self, id: ObjectId) -> Option<Object> {
let action = |object: &mut Object| match *object {
Object::Array(ref mut array) => {
if let Some(index) = array.iter().position(|item: &Object| match *item {
Object::Reference(ref_id) => ref_id == id,
_ => false,
}) {
array.remove(index);
}
}
Object::Dictionary(ref mut dict) => {
let keys: Vec<Vec<u8>> = dict
.iter()
.filter(|&(_, item): &(&Vec<u8>, &Object)| match *item {
Object::Reference(ref_id) => ref_id == id,
_ => false,
})
.map(|(k, _)| k.clone())
.collect();
for key in keys {
dict.remove(&key);
}
}
_ => {}
};
self.traverse_objects(action);
self.objects.remove(&id)
}
pub fn delete_zero_length_streams(&mut self) -> Vec<ObjectId> {
let mut ids = vec![];
for id in self.objects.keys() {
if self
.objects
.get(id)
.and_then(|o| Object::as_stream(o).ok())
.map(|stream| stream.content.is_empty())
.unwrap_or(false)
{
ids.push(*id);
}
}
for id in &ids {
self.delete_object(*id);
}
ids
}
pub fn renumber_objects(&mut self) {
self.renumber_objects_with(1)
}
fn update_bookmark_pages(&mut self, bookmarks: &[u32], old: &ObjectId, new: &ObjectId) {
for id in bookmarks {
let (children, page) = match self.bookmark_table.get(id) {
Some(n) => (n.children.clone(), n.page),
None => return,
};
if page == *old {
let bookmark = self.bookmark_table.get_mut(id).unwrap();
bookmark.page = *new;
}
if !children.is_empty() {
self.update_bookmark_pages(&children[..], old, new);
}
}
}
pub fn renumber_bookmarks(&mut self, old: &ObjectId, new: &ObjectId) {
if !self.bookmarks.is_empty() {
self.update_bookmark_pages(&self.bookmarks.clone(), old, new);
}
}
pub fn renumber_objects_with(&mut self, starting_id: u32) {
let mut replace = BTreeMap::new();
let mut new_id = starting_id;
let mut ids = self.objects.keys().cloned().collect::<Vec<ObjectId>>();
ids.sort_unstable();
for id in ids {
if id.0 != new_id {
replace.insert(id, (new_id, id.1));
}
new_id += 1;
}
let mut objects = BTreeMap::new();
for (old, new) in &replace {
if let Some(object) = self.objects.remove(old) {
objects.insert(*new, object);
}
if old != new {
self.renumber_bookmarks(old, new);
}
}
for (new, object) in objects {
self.objects.insert(new, object);
}
let action = |object: &mut Object| {
if let Object::Reference(ref mut id) = *object {
if replace.contains_key(&id) {
*id = replace[id];
}
}
};
self.traverse_objects(action);
self.max_id = new_id - 1;
}
pub fn change_content_stream(&mut self, stream_id: ObjectId, content: Vec<u8>) {
if let Some(content_stream) = self.objects.get_mut(&stream_id) {
if let Object::Stream(ref mut stream) = *content_stream {
stream.set_plain_content(content);
let _ = stream.compress();
}
}
}
pub fn change_page_content(&mut self, page_id: ObjectId, content: Vec<u8>) -> Result<()> {
let contents = self.get_dictionary(page_id).and_then(|page| page.get(b"Contents"))?;
match *contents {
Object::Reference(id) => self.change_content_stream(id, content),
Object::Array(ref arr) => {
if arr.len() == 1 {
if let Ok(id) = arr[0].as_reference() {
self.change_content_stream(id, content)
}
} else {
let new_stream = self.add_object(super::Stream::new(dictionary! {}, content));
if let Ok(page) = self.get_object_mut(page_id) {
if let Object::Dictionary(ref mut dict) = *page {
dict.set("Contents", new_stream);
}
}
}
}
_ => {}
}
Ok(())
}
pub fn extract_stream(&self, stream_id: ObjectId, decompress: bool) -> Result<()> {
let mut file = File::create(format!("{:?}.bin", stream_id))?;
if let Ok(stream_obj) = self.get_object(stream_id) {
if let Object::Stream(ref stream) = *stream_obj {
if decompress {
if let Ok(data) = stream.decompressed_content() {
file.write_all(&data)?;
} else {
file.write_all(&stream.content)?;
}
} else {
file.write_all(&stream.content)?;
}
}
}
Ok(())
}
}