You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: parser_aux.rs
    path of file: ./repos/lopdf/src
    
    the code of the file until where you have to start completion: #![cfg(any(feature = "pom_parser", feature = "nom_parser"))]

use crate::{
    content::{Content, Operation},
    document::Document,
    error::XrefError,
    object::Object::Name,
    xref::{Xref, XrefEntry, XrefType},
    Error, Result,
};
use crate::{parser, Dictionary, Object, ObjectId, Stream};
use log::info;
use std::{
    collections::BTreeMap,
    io::{Cursor, Read},
};

impl Content<Vec<Operation>> {
    /// Decode content operations.
    pub fn decode(data: &[u8]) -> Result<Self> {
        parser::content(data).ok_or(Error::ContentDecode)
    }
}

impl Stream {
    /// Decode content after decoding all stream filters.
    pub fn decode_content(&self) -> Result<Content<Vec<Operation>>> {
        Content::decode(&self.content)
    }
}

impl Document {
    /// Get decoded page content;
    pub fn get_and_decode_page_content(&self, page_id: ObjectId) -> Result<Content<Vec<Operation>>> {
        let content_data = self.get_page_co
    
pub fn decode_xref_stream(mut stream: Stream) -> Result<(Xref, Dictionary)> {
    stream.decompress();
    let mut dict = stream.dict;
    let mut reader = Cursor::new(stream.content);
    let size = dict
        .get(b"Size")
        .and_then(Object::as_i64)
        .map_err(|_| Error::Xref(XrefError::Parse))?;
    let mut xref = Xref::new(size as u32, XrefType::CrossReferenceStream);
    {
        let section_indice = dict
            .get(b"Index")
            .and_then(parse_integer_array)
            .unwrap_or_else(|_| vec![0, size]);
        let field_widths = dict
            .get(b"W")
            .and_then(parse_integer_array)
            .map_err(|_| Error::Xref(XrefError::Parse))?;

        if field_widths.len() < 3
            || field_widths[0].is_negative()
            || field_widths[1].is_negative()
            || field_widths[2].is_negative()
        {
            return Err(Error::Xref(XrefError::Parse));
        }

        let mut bytes1 = vec![0_u8; field_widths[0] as usize];
        let mut bytes2 = vec![0_u8; field_widths[1] as usize];
        let mut bytes3 = vec![0_u8; field_widths[2] as usize];

        for i in 0..section_indice.len() / 2 {
            let start = section_indice[2 * i];
            let count = section_indice[2 * i + 1];

            for j in 0..count {
                let entry_type = if !bytes1.is_empty() {
                    read_big_endian_integer(&mut reader, bytes1.as_mut_slice())?
                } else {
                    1
                };
                match entry_type {
                    0 => {
                        //free object
                        read_big_endian_integer(&mut reader, bytes2.as_mut_slice())?;
                        read_big_endian_integer(&mut reader, bytes3.as_mut_slice())?;
                    }
                    1 => {
                        //normal object
                        let offset = read_big_endian_integer(&mut reader, bytes2.as_mut_slice())?;
                        let generation = if !bytes3.is_empty() {
                            read_big_endian_integer(&mut reader, bytes3.as_mut_slice())?
                        } else {
                            0
                        } as u16;
                        xref.insert((start + j) as u32, XrefEntry::Normal { offset, generation });
                    }
                    2 => {
                        //compressed object
                        let container = read_big_endian_integer(&mut reader, bytes2.as_mut_slice())?;
                        let index = read_big_endian_integer(&mut reader, bytes3.as_mut_slice())? as u16;
                        xref.insert((start + j) as u32, XrefEntry::Compressed { container, index });
                    }
                    _ => {}
                }
            }
        }
    }
    dict.remove(b"Length");
    dict.remove(b"W");
    dict.remove(b"Index");
    Ok((xref, dict))
}