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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::Bindings::BlobBinding;
use dom::bindings::codegen::Bindings::BlobBinding::BlobMethods;
use dom::bindings::codegen::UnionTypes::BlobOrString;
use dom::bindings::error::Fallible;
use dom::bindings::global::GlobalRef;
use dom::bindings::js::Root;
use dom::bindings::reflector::{Reflectable, Reflector, reflect_dom_object};
use dom::bindings::str::DOMString;
use encoding::all::UTF_8;
use encoding::types::{EncoderTrap, Encoding};
use num_traits::ToPrimitive;
use std::ascii::AsciiExt;
use std::borrow::ToOwned;
use std::cell::Cell;
use std::cmp::{max, min};
use std::sync::Arc;
#[derive(Clone, JSTraceable)]
pub struct DataSlice {
bytes: Arc<Vec<u8>>,
bytes_start: usize,
bytes_end: usize
}
impl DataSlice {
/// Construct DataSlice from reference counted bytes
pub fn new(bytes: Arc<Vec<u8>>, start: Option<i64>, end: Option<i64>) -> DataSlice {
let size = bytes.len() as i64;
let relativeStart: i64 = match start {
None => 0,
Some(start) => {
if start < 0 {
max(size + 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 span: i64 = max(relativeEnd - relativeStart, 0);
let start = relativeStart.to_usize().unwrap();
let end = (relativeStart + span).to_usize().unwrap();
DataSlice {
bytes: bytes,
bytes_start: start,
bytes_end: end
}
}
/// Construct an empty data slice
pub fn empty() -> DataSlice {
DataSlice {
bytes: Arc::new(Vec::new()),
bytes_start: 0,
bytes_end: 0,
}
}
/// Get sliced bytes
pub fn get_bytes(&self) -> &[u8] {
&self.bytes[self.bytes_start..self.bytes_end]
}
/// Get length of sliced bytes
pub fn size(&self) -> u64 {
(self.bytes_end as u64) - (self.bytes_start as u64)
}
}
// https://w3c.github.io/FileAPI/#blob
#[dom_struct]
pub struct Blob {
reflector_: Reflector,
#[ignore_heap_size_of = "No clear owner"]
data: DataSlice,
typeString: String,
isClosed_: Cell<bool>,
}
impl Blob {
pub fn new(global: GlobalRef, slice: DataSlice, typeString: &str) -> Root<Blob> {
let boxed_blob = box Blob::new_inherited(slice, typeString);
reflect_dom_object(boxed_blob, global, BlobBinding::Wrap)
}
pub fn new_inherited(slice: DataSlice, typeString: &str) -> Blob {
Blob {
reflector_: Reflector::new(),
data: slice,
typeString: typeString.to_owned(),
isClosed_: Cell::new(false),
}
}
// https://w3c.github.io/FileAPI/#constructorBlob
pub fn Constructor(global: GlobalRef,
blobParts: Option<Vec<BlobOrString>>,
blobPropertyBag: &BlobBinding::BlobPropertyBag)
-> Fallible<Root<Blob>> {
// TODO: accept other blobParts types - ArrayBuffer or ArrayBufferView
let bytes: Vec<u8> = match blobParts {
None => Vec::new(),
Some(blobparts) => blob_parts_to_bytes(blobparts),
};
let slice = DataSlice::new(Arc::new(bytes), None, None);
Ok(Blob::new(global, slice, &blobPropertyBag.get_typestring()))
}
pub fn get_data(&self) -> &DataSlice {
&self.data
}
}
pub fn blob_parts_to_bytes(blobparts: Vec<BlobOrString>) -> Vec<u8> {
blobparts.iter().flat_map(|blobpart| {
match blobpart {
&BlobOrString::String(ref s) => {
UTF_8.encode(s, EncoderTrap::Replace).unwrap()
},
&BlobOrString::Blob(ref b) => {
b.get_data().get_bytes().to_vec()
},
}
}).collect::<Vec<u8>>()
}
impl BlobMethods for Blob {
// https://w3c.github.io/FileAPI/#dfn-size
fn Size(&self) -> u64 {
self.data.size()
}
// https://w3c.github.io/FileAPI/#dfn-type
fn Type(&self) -> DOMString {
DOMString::from(self.typeString.clone())
}
// https://w3c.github.io/FileAPI/#slice-method-algo
fn Slice(&self,
start: Option<i64>,
end: Option<i64>,
contentType: Option<DOMString>)
-> Root<Blob> {
let relativeContentType = match contentType {
None => DOMString::new(),
Some(mut str) => {
if is_ascii_printable(&str) {
str.make_ascii_lowercase();
str
} else {
DOMString::new()
}
}
};
let global = self.global();
let bytes = self.data.bytes.clone();
Blob::new(global.r(), DataSlice::new(bytes, start, end), &relativeContentType)
}
// https://w3c.github.io/FileAPI/#dfn-isClosed
fn IsClosed(&self) -> bool {
self.isClosed_.get()
}
// https://w3c.github.io/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 BlobBinding::BlobPropertyBag {
pub fn get_typestring(&self) -> String {
if is_ascii_printable(&self.type_) {
self.type_.to_lowercase()
} else {
"".to_string()
}
}
}
fn is_ascii_printable(string: &str) -> bool {
// Step 5.1 in Sec 5.1 of File API spec
// https://w3c.github.io/FileAPI/#constructorBlob
string.chars().all(|c| c >= '\x20' && c <= '\x7E')
}
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