diff options
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | Cargo.lock | 437 | ||||
| -rw-r--r-- | Cargo.toml | 2 | ||||
| -rw-r--r-- | src/lib.rs | 183 | ||||
| -rw-r--r-- | src/utils.rs | 78 |
5 files changed, 242 insertions, 459 deletions
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(registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f" @@ -1,6 +1,6 @@ [package] name = "pdf_form" -version = "0.3.0" +version = "0.4.0" authors = ["Jake <jsandler18@gmail.com>", "Malte <voos.malte@gmail.com>", "Emulator000 <emulator@hotmail.it>"] readme = "README.md" keywords = ["pdf", "form"] @@ -13,6 +13,7 @@ use std::str; use bitflags::_core::str::from_utf8; +use lopdf::content::{Content, Operation}; use lopdf::{Document, Object, ObjectId, StringFormat}; use crate::utils::*; @@ -135,18 +136,27 @@ impl Form { Self::load_doc(doc) } - fn load_doc(doc: Document) -> Result<Self, LoadError> { + fn load_doc(mut doc: Document) -> Result<Self, LoadError> { let mut form_ids = Vec::new(); let mut queue = VecDeque::new(); // Block so borrow of doc ends before doc is moved into the result { - // Get the form's top level fields - let catalog = doc.trailer.get(b"Root")?.deref(&doc)?.as_dict()?; - let acroform = catalog.get(b"AcroForm")?.deref(&doc)?.as_dict()?; - let fields_list = acroform - .get(b"Fields")? - // .deref(&doc)? - .as_array()?; + doc.decompress(); + + let acroform = doc + .objects + .get_mut( + &doc.trailer + .get(b"Root")? + .deref(&doc)? + .as_dict()? + .get(b"AcroForm")? + .as_reference()?, + ) + .ok_or(LoadError::NotAReference)? + .as_dict_mut()?; + + let fields_list = acroform.get(b"Fields")?.as_array()?; queue.append(&mut VecDeque::from(fields_list.clone())); // Iterate over the fields @@ -423,8 +433,10 @@ impl Form { .as_dict_mut() .unwrap(); - field.set("V", Object::String(s.into_bytes(), StringFormat::Literal)); - field.remove(b"AP"); + field.set("V", Object::string_literal(s.into_bytes())); + + // Regenerate text appearance confoming the new text but ignore the result + let _ = self.regenerate_text_appearance(n); Ok(()) } @@ -432,6 +444,139 @@ impl Form { } } + /// Regenerates the appearance for the field at index `n` due to an alteration of the + /// original TextField value, the AP will be updated accordingly. + /// + /// # Incomplete + /// This function is not exhaustive as not parse the original TextField orientation + /// or the text alignment and other kind of enrichments, also doesn't discover for + /// the global document DA. + /// + /// A more sophisticated parser is needed here + fn regenerate_text_appearance(&mut self, n: usize) -> Result<(), lopdf::Error> { + let field = { + self.doc + .objects + .get(&self.form_ids[n]) + .unwrap() + .as_dict() + .unwrap() + }; + + // The value of the object (should be a string) + let value = field.get(b"V")?.to_owned(); + + // The default appearance of the object (should be a string) + let da = field.get(b"DA")?.to_owned(); + + // The default appearance of the object (should be a string) + let rect = field + .get(b"Rect")? + .as_array()? + .iter() + .map(|object| { + object + .as_f64() + .unwrap_or(object.as_i64().unwrap_or(0) as f64) as f32 + }) + .collect::<Vec<_>>(); + + // Gets the object stream + let object_id = field.get(b"AP")?.as_dict()?.get(b"N")?.as_reference()?; + let stream = self.doc.get_object_mut(object_id)?.as_stream_mut()?; + + // Decode and get the content, even if is compressed + let mut content = { + if let Ok(content) = stream.decompressed_content() { + Content::decode(&content)? + } else { + Content::decode(&stream.content)? + } + }; + + // Ignored operators + let ignored_operators = vec![ + "bt", "tc", "tw", "tz", "g", "tm", "tr", "tf", "tj", "et", "q", "bmc", "emc", + ]; + + // Remove these ignored operators as we have to generate the text and fonts again + content.operations.retain(|operation| { + !ignored_operators.contains(&operation.operator.to_lowercase().as_str()) + }); + + // Let's construct the text widget + content.operations.append(&mut vec![ + Operation::new("BMC", vec!["Tx".into()]), + Operation::new("q", vec![]), + Operation::new("BT", vec![]), + ]); + + let font = parse_font(match da { + Object::String(ref bytes, _) => Some(from_utf8(bytes)?), + _ => None, + }); + + // Define some helping font variables + let font_name = (font.0).0; + let font_size = (font.0).1; + let font_color = font.1; + + // Set the font type and size and color + content.operations.append(&mut vec![ + Operation::new("Tf", vec![font_name.into(), font_size.into()]), + Operation::new( + font_color.0, + match font_color.0 { + "k" => vec![ + font_color.1.into(), + font_color.2.into(), + font_color.3.into(), + font_color.4.into(), + ], + "rg" => vec![ + font_color.1.into(), + font_color.2.into(), + font_color.3.into(), + ], + _ => vec![font_color.1.into()], + }, + ), + ]); + + // Calcolate the text offset + let x = 2.0; // Suppose this fixed offset as we should have known the border here + + // Formula picked up from Poppler + let dy = rect[1] - rect[3]; + let y = if dy > 0.0 { + 0.5 * dy - 0.4 * font_size as f32 + } else { + 0.5 * font_size as f32 + }; + + // Set the text bounds, first are fixed at "1 0 0 1" and then the calculated x,y + content.operations.append(&mut vec![Operation::new( + "Tm", + vec![1.into(), 0.into(), 0.into(), 1.into(), x.into(), y.into()], + )]); + + // Set the text value and some finalizing operations + content.operations.append(&mut vec![ + Operation::new("Tj", vec![value]), + Operation::new("ET", vec![]), + Operation::new("Q", vec![]), + Operation::new("EMC", vec![]), + ]); + + // Set the new content to the original stream and compress it + if let Ok(encoded_content) = content.encode() { + stream.set_plain_content(encoded_content); + let _ = stream.compress(); + } + + Ok(()) + } + /// If the field at index `n` is a checkbox field, toggles the check box based on the value /// `is_checked`. /// If it is not a checkbox field, returns ValueError @@ -441,17 +586,6 @@ impl Form { pub fn set_check_box(&mut self, n: usize, is_checked: bool) -> Result<(), ValueError> { match self.get_state(n) { FieldState::CheckBox { .. } => { - let state = Object::Name( - { - if is_checked { - "Yes" - } else { - "Off" - } - } - .to_owned() - .into_bytes(), - ); let field = self .doc .objects @@ -460,6 +594,13 @@ impl Form { .as_dict_mut() .unwrap(); + let on = get_on_value(field); + let state = Object::Name( + if is_checked { on.as_str() } else { "Off" } + .to_owned() + .into_bytes(), + ); + field.set("V", state.clone()); field.set("AS", state); diff --git a/src/utils.rs b/src/utils.rs index 7ff4e41..0aa342a 100644 --- a/src/utils.rs +++ b/src/utils.rs @@ -1,5 +1,7 @@ use lopdf::{Dictionary, Object}; +use crate::from_utf8; + bitflags! { pub struct FieldFlags: u32 { const READONLY = 0x1; @@ -47,3 +49,79 @@ pub fn get_field_flags(field: &Dictionary) -> u32 { .as_i64() .unwrap() as u32 } + +pub fn get_on_value(field: &Dictionary) -> String { + let mut option = None; + if let Ok(ap) = field.get(b"AP") { + if let Ok(dict) = ap.as_dict() { + if let Ok(values) = dict.get(b"N") { + if let Ok(options) = values.as_dict() { + for (name, _) in options { + if let Ok(name) = from_utf8(name) { + if name != "Off" && option.is_none() { + option = Some(name.into()); + } + } + } + } + } + } + } + + option.unwrap_or("Yes".into()) +} + +pub fn parse_font(font_string: Option<&str>) -> ((&str, i32), (&str, i32, i32, i32, i32)) { + // The default font object (/Helv 12 Tf 0 g) + let default_font = ("Helv", 12); + let default_color = ("g", 0, 0, 0, 0); + + // Build the font basing on the default appearance, if exists, if not, + // assume a default font (surely to be improved!) + match font_string { + Some(font_string) => { + let font = font_string + .trim_start_matches('/') + .split("Tf") + .collect::<Vec<_>>(); + + if font.len() < 2 { + (default_font, default_color) + } else { + let font_family = font[0].trim().split(' ').collect::<Vec<_>>(); + let font_color = font[1].trim().split(' ').collect::<Vec<_>>(); + + let font = if font_family.len() >= 2 { + (font_family[0], font_family[1].parse::<i32>().unwrap_or(0)) + } else { + default_font + }; + + let color = if font_color.len() == 2 { + ("g", font_color[0].parse::<i32>().unwrap_or(0), 0, 0, 0) + } else if font_color.len() == 4 { + ( + "rg", + font_color[0].parse::<i32>().unwrap_or(0), + font_color[1].parse::<i32>().unwrap_or(0), + font_color[2].parse::<i32>().unwrap_or(0), + 0, + ) + } else if font_color.len() == 5 { + ( + "k", + font_color[0].parse::<i32>().unwrap_or(0), + font_color[1].parse::<i32>().unwrap_or(0), + font_color[2].parse::<i32>().unwrap_or(0), + font_color[3].parse::<i32>().unwrap_or(0), + ) + } else { + default_color + }; + + (font, color) + } + } + _ => (default_font, default_color), + } +} |