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use byteorder::{self, ByteOrder, BigEndian, ReadBytesExt};
use error;
use types;
use std::io::{self, SeekFrom, Read};
use std::mem::size_of;
use std::vec::Vec;
pub trait ReadBytesLocal: io::Read {
#[inline]
fn be_read_u32(&mut self) -> Result<u32, byteorder::Error> {
return self.read_u32::<BigEndian>();
}
#[inline]
fn be_read_u16(&mut self) -> Result<u16, byteorder::Error> {
return self.read_u16::<BigEndian>();
}
#[inline]
fn be_read_i32(&mut self) -> Result<i32, byteorder::Error> {
return self.read_i32::<BigEndian>();
}
#[inline]
fn be_read_i16(&mut self) -> Result<i16, byteorder::Error> {
return self.read_i16::<BigEndian>();
}
}
impl<R: io::Read + ?Sized> ReadBytesLocal for R {}
#[macro_use(try)]
macro_rules! add_decoder {
( $( #[$struct_attr:meta] )*
pub struct $name:ident {
$(pub $field_name:ident: $field_type:ty,)*
}) => {
$( #[$struct_attr] )*
pub struct $name {
$(pub $field_name: $field_type,)*
}
impl ::utils::Decodeable for $name {
fn read_and_decode(stream: &mut ::types::ReadSeeker) -> ::std::result::Result<$name, ::error::Error> {
let s: $name = $name{
$($field_name : try!(::utils::Decodeable::read_and_decode(stream))),+
};
Ok(s)
}
}
};
}
pub trait Decodeable {
fn read_and_decode(&mut types::ReadSeeker) -> Result<Self, ::error::Error> where Self: Sized;
}
impl Decodeable for u8 {
#[inline]
fn read_and_decode(stream: &mut types::ReadSeeker) -> Result<Self, error::Error> {
let r = try!(stream.read_u8());
Ok(r)
}
}
impl Decodeable for u32 {
#[inline]
fn read_and_decode(stream: &mut types::ReadSeeker) -> Result<u32, error::Error> {
let r = try!(stream.be_read_u32());
Ok(r)
}
}
impl Decodeable for u16 {
#[inline]
fn read_and_decode(stream: &mut types::ReadSeeker) -> Result<Self, error::Error> {
let r = try!(stream.be_read_u16());
Ok(r)
}
}
impl Decodeable for i8 {
#[inline]
fn read_and_decode(stream: &mut types::ReadSeeker) -> Result<Self, error::Error> {
let r = try!(stream.read_i8());
Ok(r)
}
}
impl Decodeable for i32 {
#[inline]
fn read_and_decode(stream: &mut types::ReadSeeker) -> Result<i32, error::Error> {
let r = try!(stream.be_read_i32());
Ok(r)
}
}
impl Decodeable for i16 {
#[inline]
fn read_and_decode(stream: &mut types::ReadSeeker) -> Result<Self, error::Error> {
let r = try!(stream.be_read_i16());
Ok(r)
}
}
impl Decodeable for String {
fn read_and_decode(stream: &mut types::ReadSeeker) -> Result<Self, error::Error> {
let length: usize = try!(stream.be_read_u32()) as usize;
let mut buf: Vec<u8> = Vec::with_capacity(length);
unsafe {
buf.set_len(length);
}
try!(stream.read_exact(&mut buf));
let s = try!(String::from_utf8(buf));
let mut padding = (4 - (length as i64)) % 4;
if padding < 0 {
padding += 4
}
if padding != 0 {
try!(stream.seek(SeekFrom::Current(padding as i64)));
}
Ok(s)
}
}
impl<T: Decodeable> Decodeable for Vec<T> {
fn read_and_decode(stream: &mut types::ReadSeeker) -> Result<Vec<T>, error::Error> {
let count = try!(stream.be_read_u32());
let mut results: Vec<T> = Vec::new();
let total_size = ((count as usize) * size_of::<T>()) as i64;
let mut padding = (4 - total_size) % 4;
if padding < 0 {
padding += 4
}
for _ in 0..count {
let x: Result<T, error::Error> = ::utils::Decodeable::read_and_decode(stream);
match x {
Ok(x) => results.push(x),
Err(error::Error::UnknownType(_)) => continue,
Err(e) => return Err(e),
}
}
try!(stream.seek(SeekFrom::Current(padding as i64)));
Ok(results)
}
}