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use crate as pdf;
use crate::object::*;
use crate::primitive::*;
use crate::error::*;
use crate::parser::Lexer;
use crate::enc::decode;
use once_cell::unsync::OnceCell;
use std::borrow::Cow;
use std::io;
use std::ops::Deref;
use std::fmt;
pub struct Stream<I: Object=()> {
pub info: StreamInfo<I>,
raw_data: Vec<u8>,
decoded: OnceCell<Vec<u8>>
}
impl<I: Object + fmt::Debug> Stream<I> {
pub fn from_stream(s: PdfStream, resolve: &impl Resolve) -> Result<Self> {
let PdfStream {info, data} = s;
let info = StreamInfo::<I>::from_primitive(Primitive::Dictionary (info), resolve)?;
Ok(Stream { info, raw_data: data, decoded: OnceCell::new() })
}
pub fn decode(&self) -> Result<Cow<[u8]>> {
let mut data = Cow::Borrowed(&*self.raw_data);
for filter in &self.info.filters {
data = match decode(&*data, filter) {
Ok(data) => data.into(),
Err(e) => {
info!("Stream Info: {:?}", &self.info);
dump_data(&data);
return Err(e);
}
};
}
Ok(data)
}
pub fn data(&self) -> Result<&[u8]> {
self.decoded.get_or_try_init(|| {
let data = self.decode()?;
Ok(data.into_owned())
}).map(|v| v.as_slice())
}
pub fn as_jpeg(&self) -> Option<&[u8]> {
match *self.info.filters.as_slice() {
[StreamFilter::DCTDecode(_)] => Some(self.raw_data.as_slice()),
_ => None
}
}
}
impl<I: Object + fmt::Debug> fmt::Debug for Stream<I> {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
self.info.info.fmt(f)
}
}
impl<I: Object + fmt::Debug> Object for Stream<I> {
fn serialize<W: io::Write>(&self, _: &mut W) -> Result<()> {unimplemented!()}
fn from_primitive(p: Primitive, resolve: &impl Resolve) -> Result<Self> {
let s = PdfStream::from_primitive(p, resolve)?;
Stream::from_stream(s, resolve)
}
}
impl<I:Object> Deref for Stream<I> {
type Target = StreamInfo<I>;
fn deref(&self) -> &StreamInfo<I> {
&self.info
}
}
#[derive(Debug, Clone)]
pub struct StreamInfo<I> {
pub filters: Vec<StreamFilter>,
pub file: Option<FileSpec>,
pub file_filters: Vec<StreamFilter>,
info: I,
}
impl<I> Deref for StreamInfo<I> {
type Target = I;
fn deref(&self) -> &I {
&self.info
}
}
impl<I: Default> Default for StreamInfo<I> {
fn default() -> StreamInfo<I> {
StreamInfo {
filters: Vec::new(),
file: None,
file_filters: Vec::new(),
info: I::default(),
}
}
}
impl<T> StreamInfo<T> {
pub fn get_filters(&self) -> &[StreamFilter] {
&self.filters
}
}
impl<T: Object> Object for StreamInfo<T> {
fn serialize<W: io::Write>(&self, _out: &mut W) -> Result<()> {
unimplemented!();
}
fn from_primitive(p: Primitive, resolve: &impl Resolve) -> Result<Self> {
let mut dict = Dictionary::from_primitive(p, resolve)?;
let _length = usize::from_primitive(
dict.remove("Length").ok_or(PdfError::MissingEntry{ typ: "StreamInfo", field: "Length".into() })?,
resolve)?;
let filters = Vec::<String>::from_primitive(
dict.remove("Filter").or(Some(Primitive::Null)).unwrap(),
resolve)?;
let decode_params = Vec::<Dictionary>::from_primitive(
dict.remove("DecodeParms").or(Some(Primitive::Null)).unwrap(),
resolve)?;
let file = Option::<FileSpec>::from_primitive(
dict.remove("F").or(Some(Primitive::Null)).unwrap(),
resolve)?;
let file_filters = Vec::<String>::from_primitive(
dict.remove("FFilter").or(Some(Primitive::Null)).unwrap(),
resolve)?;
let file_decode_params = Vec::<Dictionary>::from_primitive(
dict.remove("FDecodeParms").or(Some(Primitive::Null)).unwrap(),
resolve)?;
let mut new_filters = Vec::new();
let mut new_file_filters = Vec::new();
for (i, filter) in filters.iter().enumerate() {
let params = match decode_params.get(i) {
Some(params) => params.clone(),
None => Dictionary::default(),
};
new_filters.push(StreamFilter::from_kind_and_params(filter, params, resolve)?);
}
for (i, filter) in file_filters.iter().enumerate() {
let params = match file_decode_params.get(i) {
Some(params) => params.clone(),
None => Dictionary::default(),
};
new_file_filters.push(StreamFilter::from_kind_and_params(filter, params, resolve)?);
}
Ok(StreamInfo {
filters: new_filters,
file,
file_filters: new_file_filters,
info: T::from_primitive(Primitive::Dictionary (dict), resolve)?,
})
}
}
#[derive(Object, Default, Debug)]
#[pdf(Type = "ObjStm")]
pub struct ObjStmInfo {
#[pdf(key = "N")]
pub num_objects: i32,
#[pdf(key = "First")]
pub first: i32,
#[pdf(key = "Extends")]
pub extends: Option<Rc<Stream>>,
}
pub struct ObjectStream {
offsets: Vec<usize>,
_id: ObjNr,
inner: Stream<ObjStmInfo>
}
impl Object for ObjectStream {
fn serialize<W: io::Write>(&self, _out: &mut W) -> Result<()> {
unimplemented!();
}
fn from_primitive(p: Primitive, resolve: &impl Resolve) -> Result<ObjectStream> {
let stream: Stream<ObjStmInfo> = Stream::from_primitive(p, resolve)?;
let mut offsets = Vec::new();
{
debug!("parsing stream");
let mut lexer = Lexer::new(stream.data()?);
for _ in 0..(stream.info.num_objects as ObjNr) {
let _obj_nr = lexer.next()?.to::<ObjNr>()?;
let offset = lexer.next()?.to::<usize>()?;
offsets.push(offset);
}
}
Ok(ObjectStream {
offsets,
_id: 0,
inner: stream
})
}
}
impl ObjectStream {
pub fn get_object_slice(&self, index: usize) -> Result<&[u8]> {
if index >= self.offsets.len() {
err!(PdfError::ObjStmOutOfBounds {index, max: self.offsets.len()});
}
let start = self.inner.info.first as usize + self.offsets[index];
let data = self.inner.data()?;
let end = if index == self.offsets.len() - 1 {
data.len()
} else {
self.inner.info.first as usize + self.offsets[index + 1]
};
Ok(&data[start..end])
}
pub fn n_objects(&self) -> usize {
self.offsets.len()
}
}