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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use dom::bindings::codegen::InheritTypes::FileDerived;
use dom::bindings::global::{GlobalRef, GlobalField};
use dom::bindings::js::Root;
use dom::bindings::utils::{Reflector, reflect_dom_object};
use dom::bindings::error::Fallible;
use dom::bindings::codegen::Bindings::BlobBinding;
use dom::bindings::codegen::Bindings::BlobBinding::BlobMethods;
use std::sync::mpsc::Sender;
use util::str::DOMString;
use num::ToPrimitive;
use std::ascii::AsciiExt;
use std::borrow::ToOwned;
use std::cmp::{min, max};
use std::cell::{Cell};
#[derive(JSTraceable, HeapSizeOf)]
pub enum BlobTypeId {
Blob,
File,
}
// http://dev.w3.org/2006/webapi/FileAPI/#blob
#[dom_struct]
#[derive(HeapSizeOf)]
pub struct Blob {
reflector_: Reflector,
type_: BlobTypeId,
bytes: Option<Vec<u8>>,
typeString: DOMString,
global: GlobalField,
isClosed_: Cell<bool>
}
fn is_ascii_printable(string: &DOMString) -> bool {
// Step 5.1 in Sec 5.1 of File API spec
// http://dev.w3.org/2006/webapi/FileAPI/#constructorBlob
return string.chars().all(|c| { c >= '\x20' && c <= '\x7E' })
}
impl Blob {
pub fn new_inherited(global: GlobalRef, type_: BlobTypeId,
bytes: Option<Vec<u8>>, typeString: &str) -> Blob {
Blob {
reflector_: Reflector::new(),
type_: type_,
bytes: bytes,
typeString: typeString.to_owned(),
global: GlobalField::from_rooted(&global),
isClosed_: Cell::new(false)
}
}
pub fn new(global: GlobalRef, bytes: Option<Vec<u8>>,
typeString: &str) -> Root<Blob> {
reflect_dom_object(box Blob::new_inherited(global, BlobTypeId::Blob, bytes, typeString),
global,
BlobBinding::Wrap)
}
// http://dev.w3.org/2006/webapi/FileAPI/#constructorBlob
pub fn Constructor(global: GlobalRef) -> Fallible<Root<Blob>> {
Ok(Blob::new(global, None, ""))
}
// http://dev.w3.org/2006/webapi/FileAPI/#constructorBlob
pub fn Constructor_(global: GlobalRef, blobParts: DOMString,
blobPropertyBag: &BlobBinding::BlobPropertyBag) -> Fallible<Root<Blob>> {
//TODO: accept other blobParts types - ArrayBuffer or ArrayBufferView or Blob
let bytes: Option<Vec<u8>> = Some(blobParts.into_bytes());
let typeString = if is_ascii_printable(&blobPropertyBag.type_) {
&*blobPropertyBag.type_
} else {
""
};
Ok(Blob::new(global, bytes, &typeString.to_ascii_lowercase()))
}
}
pub trait BlobHelpers {
fn read_out_buffer(self, send: Sender<Vec<u8>>);
}
impl<'a> BlobHelpers for &'a Blob {
fn read_out_buffer(self, send: Sender<Vec<u8>>) {
send.send(self.bytes.clone().unwrap_or(vec![])).unwrap();
}
}
impl<'a> BlobMethods for &'a Blob {
// https://dev.w3.org/2006/webapi/FileAPI/#dfn-size
fn Size(self) -> u64 {
match self.bytes {
None => 0,
Some(ref bytes) => bytes.len() as u64
}
}
// https://dev.w3.org/2006/webapi/FileAPI/#dfn-type
fn Type(self) -> DOMString {
self.typeString.clone()
}
// https://dev.w3.org/2006/webapi/FileAPI/#slice-method-algo
fn Slice(self, start: Option<i64>, end: Option<i64>,
contentType: Option<DOMString>) -> Root<Blob> {
let size: i64 = self.Size().to_i64().unwrap();
let relativeStart: i64 = match start {
None => 0,
Some(start) => {
if start < 0 {
max(size.to_i64().unwrap() + start, 0)
} else {
min(start, size)
}
}
};
let relativeEnd: i64 = match end {
None => size,
Some(end) => {
if end < 0 {
max(size + end, 0)
} else {
min(end, size)
}
}
};
let relativeContentType = match contentType {
None => "".to_owned(),
Some(str) => {
if is_ascii_printable(&str) {
str.to_ascii_lowercase()
} else {
"".to_owned()
}
}
};
let span: i64 = max(relativeEnd - relativeStart, 0);
let global = self.global.root();
match self.bytes {
None => Blob::new(global.r(), None, &relativeContentType),
Some(ref vec) => {
let start = relativeStart.to_usize().unwrap();
let end = (relativeStart + span).to_usize().unwrap();
let mut bytes: Vec<u8> = Vec::new();
bytes.push_all(&vec[start..end]);
Blob::new(global.r(), Some(bytes), &relativeContentType)
}
}
}
// https://dev.w3.org/2006/webapi/FileAPI/#dfn-isClosed
fn IsClosed(self) -> bool {
self.isClosed_.get()
}
// https://dev.w3.org/2006/webapi/FileAPI/#dfn-close
fn Close(self) {
// Step 1
if self.isClosed_.get() {
return;
}
// Step 2
self.isClosed_.set(true);
// TODO Step 3 if Blob URL Store is implemented
}
}
impl FileDerived for Blob {
fn is_file(&self) -> bool {
match self.type_ {
BlobTypeId::File => true,
_ => false
}
}
}
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