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//! IO functions
use std::convert::TryFrom;
use std::io::{Read, Seek, Cursor};
use std::io::Error as IoError;
use super::core::{SysDiagram, Table, Relationship};
use super::parser;
use base64::decode as base64_decode;
use base64::DecodeError as Base64DecodeError;
use cfb::CompoundFile;
use nom::{Context,ErrorKind};
use ms_oforms::controls::form::parser::parse_form_control;
use ms_oforms::controls::form::Site;
use ms_oforms::controls::ole_site_concrete::Clsid;
use std::borrow::Cow;
/// Error wrapper when loading a sysdiagram
#[derive(Debug)]
pub enum LoadError {
NotImplemented,
Base64(Base64DecodeError),
Cfb(IoError),
StreamTooLong(std::num::TryFromIntError),
SiteTooLong(std::num::TryFromIntError),
BufTooLong(std::num::TryFromIntError),
Incomplete,
ParseError(ErrorKind),
ParseFailure,
StringEncoding(String),
}
/// Result when loading a sysdiagram
pub type LoadResult<T> = Result<T, LoadError>;
/// Try to load a sysdiagram from a base64 encoded cfb file
impl TryFrom<&str> for SysDiagram {
type Error = LoadError;
fn try_from(string: &str) -> LoadResult<Self> {
println!("{}", string.len());
base64_decode(string)
.map_err(LoadError::Base64)
.and_then(|vec| {
println!("{}", vec.len());
Self::try_from_cfb(Cursor::new(&vec[..]))
})
}
}
/// Trait to load something from an OLE file
trait TryFromCfb<T: Read + Seek> where Self: Sized {
type Error;
fn try_from_cfb(buf: T) -> Result<Self, Self::Error>;
}
impl From<nom::Err<&[u8]>> for LoadError {
fn from(e: nom::Err<&[u8]>) -> LoadError {
match e {
// Need to translate the error here, as this lives longer than the input
nom::Err::Incomplete(_) => LoadError::Incomplete,
nom::Err::Error(Context::Code(_,k)) => LoadError::ParseError(k),
nom::Err::Failure(_) => LoadError::ParseFailure,
}
}
}
impl From<nom::Err<&str>> for LoadError {
fn from(e: nom::Err<&str>) -> LoadError {
match e {
// Need to translate the error here, as this lives longer than the input
nom::Err::Incomplete(_) => LoadError::Incomplete,
nom::Err::Error(Context::Code(_,k)) => LoadError::ParseError(k),
nom::Err::Failure(_) => LoadError::ParseFailure,
}
}
}
impl From<Cow<'_, str>> for LoadError {
fn from(e: Cow<'_, str>) -> Self {
LoadError::StringEncoding(String::from(e))
}
}
/// Try to load a sysdiagram from an cfb file
impl<T: Read + Seek> TryFromCfb<T> for SysDiagram {
type Error = LoadError;
fn try_from_cfb(buf: T) -> LoadResult<Self> {
let mut reader = CompoundFile::open(buf).map_err(LoadError::Cfb)?;
let entries = reader.read_storage("/").map_err(LoadError::Cfb)?;
for entry in entries {
println!("{}: {}", entry.name(), entry.path().display());
}
let form_control_opt = if reader.is_stream("/f") {
let mut f_stream = reader.open_stream("/f").map_err(LoadError::Cfb)?;
let f_stream_len = usize::try_from(f_stream.len()).map_err(LoadError::StreamTooLong)?;
let mut bytes: Vec<u8> = Vec::with_capacity(f_stream_len);
f_stream.read_to_end(&mut bytes).map_err(LoadError::Cfb)?;
let (_rest, form_control) = parse_form_control(&bytes[..]).map_err(LoadError::from)?;
Some(form_control)
} else {
None
};
if let Some(form_control) = form_control_opt {
if reader.is_stream("/o") {
let mut o_stream = reader.open_stream("/o").map_err(LoadError::Cfb)?;
let o_stream_len = usize::try_from(o_stream.len()).map_err(LoadError::StreamTooLong)?;
let mut bytes: Vec<u8> = Vec::with_capacity(o_stream_len);
o_stream.read_to_end(&mut bytes).map_err(LoadError::Cfb)?;
let mut offset = 0;
let mut tables = Vec::new();
let mut relationships = Vec::new();
for site in &form_control.sites[..] {
match site {
Site::Ole(ref ole_site) => {
let site_len = usize::try_from(ole_site.object_stream_size).map_err(LoadError::SiteTooLong)?;
match ole_site.clsid_cache_index {
Clsid::ClassTable(index) => {
let caption = ole_site.control_tip_text.clone();
/*
println!("===============");
println!("CLASS [{}] {:#?}", index, form_control.site_classes[usize::from(index)].cls_id);
println!("{}", ole_site.name);
println!("{}", ole_site.control_tip_text);
println!("{:#?}", site_len);
println!("---------------");
*/
let data = &bytes[offset..];
if index == 0 {
// Table
let (_, sch_grid) = parser::parse_sch_grid(data)?;
tables.push(Table{sch_grid, caption});
/*
println!("{:?}", sch_grid.schema);
println!("{:?}", sch_grid.table);
println!("{:?}", sch_grid.name);
println!("{:?}", sch_grid.size1);
println!("{:?}", sch_grid.size2);
println!(" d1 {:?}", sch_grid.d1);
println!(" d2 {:?}", sch_grid.d2);
println!(" d3 {:?}", sch_grid.d3);
println!(" d4 {:?}", sch_grid.d4);
println!(" d5 {:?}", sch_grid.d5);
println!(" d6 {:?}", sch_grid.d6);
println!(" d7 {:?}", sch_grid.d7);
println!(" d8 {:?}", sch_grid.d8);
println!(" d9 {:?}", sch_grid.d9);
println!("d10 {:?}", sch_grid.d10);
println!("d11 {:?}", sch_grid.d11);
println!("d12 {:?}", sch_grid.d12);
println!("d13 {:?}", sch_grid.d13);
println!("d14 {:?}", sch_grid.d14);
*/
} else if index == 1 {
// Foreign Key
let (_, control) = parser::parse_control1(data)?;
let (_, (name, from, to)) = parser::parse_relationship(&caption[..])?;
relationships.push(Relationship{
control, caption, name, from, to,
});
/*
println!("{:#?}", control.positions);
println!("{:?}", control.pos);
println!(" d1 {:?}", control.d1);
println!(" d2 {:?}", control.d2);
println!(" d3 {:?}", control.d3);
println!(" d4 {:?}", control.d4);
println!(" d5 {:?}", control.d5);
println!(" d6 {:?}", control.d6);
println!(" d7 {:?}", control.d7);
println!(" d8 {:?}", control.d8);
println!(" d9 {:?}", control.d9);
*/
} else if index == 2 {
// Control?
// TODO
}
}
Clsid::Invalid => println!("Invalid Class"),
Clsid::Global(index) => println!("GLOBAL {}", index),
};
offset += site_len;
}
}
}
return Ok(SysDiagram{
tables, relationships,
})
}
}
Err(LoadError::NotImplemented)
}
}