script/dom/
filereadersync.rs

1/* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
4
5use std::ptr;
6
7use dom_struct::dom_struct;
8use js::jsapi::JSObject;
9use js::rust::HandleObject;
10use js::typedarray::{ArrayBufferU8, HeapArrayBuffer};
11use script_bindings::trace::RootedTraceableBox;
12
13use crate::dom::bindings::buffer_source::create_buffer_source;
14use crate::dom::bindings::codegen::Bindings::BlobBinding::BlobMethods;
15use crate::dom::bindings::codegen::Bindings::FileReaderSyncBinding::FileReaderSyncMethods;
16use crate::dom::bindings::error::{Error, Fallible};
17use crate::dom::bindings::reflector::{Reflector, reflect_dom_object_with_proto};
18use crate::dom::bindings::root::DomRoot;
19use crate::dom::bindings::str::DOMString;
20use crate::dom::blob::Blob;
21use crate::dom::filereader::FileReaderSharedFunctionality;
22use crate::dom::globalscope::GlobalScope;
23use crate::script_runtime::{CanGc, JSContext};
24
25#[dom_struct]
26pub(crate) struct FileReaderSync {
27    reflector: Reflector,
28}
29
30impl FileReaderSync {
31    pub(crate) fn new_inherited() -> FileReaderSync {
32        FileReaderSync {
33            reflector: Reflector::new(),
34        }
35    }
36
37    fn new(
38        global: &GlobalScope,
39        proto: Option<HandleObject>,
40        can_gc: CanGc,
41    ) -> DomRoot<FileReaderSync> {
42        reflect_dom_object_with_proto(
43            Box::new(FileReaderSync::new_inherited()),
44            global,
45            proto,
46            can_gc,
47        )
48    }
49
50    fn get_blob_bytes(blob: &Blob) -> Result<Vec<u8>, Error> {
51        blob.get_bytes().map_err(|_| Error::NotReadable(None))
52    }
53}
54
55impl FileReaderSyncMethods<crate::DomTypeHolder> for FileReaderSync {
56    /// <https://w3c.github.io/FileAPI/#filereadersyncConstrctr>
57    fn Constructor(
58        global: &GlobalScope,
59        proto: Option<HandleObject>,
60        can_gc: CanGc,
61    ) -> Fallible<DomRoot<FileReaderSync>> {
62        Ok(FileReaderSync::new(global, proto, can_gc))
63    }
64
65    /// <https://w3c.github.io/FileAPI/#readAsBinaryStringSyncSection>
66    fn ReadAsBinaryString(&self, blob: &Blob) -> Fallible<DOMString> {
67        // step 1
68        let blob_contents = FileReaderSync::get_blob_bytes(blob)?;
69
70        // step 2
71        Ok(DOMString::from(String::from_utf8_lossy(&blob_contents)))
72    }
73
74    /// <https://w3c.github.io/FileAPI/#readAsTextSync>
75    fn ReadAsText(&self, blob: &Blob, label: Option<DOMString>) -> Fallible<DOMString> {
76        // step 1
77        let blob_contents = FileReaderSync::get_blob_bytes(blob)?;
78
79        // step 2
80        let blob_label = label.map(String::from);
81        let blob_type = String::from(blob.Type());
82
83        let output =
84            FileReaderSharedFunctionality::text_decode(&blob_contents, &blob_type, &blob_label);
85
86        Ok(output)
87    }
88
89    /// <https://w3c.github.io/FileAPI/#readAsDataURLSync-section>
90    fn ReadAsDataURL(&self, blob: &Blob) -> Fallible<DOMString> {
91        // step 1
92        let blob_contents = FileReaderSync::get_blob_bytes(blob)?;
93
94        // step 2
95        let output =
96            FileReaderSharedFunctionality::dataurl_format(&blob_contents, blob.Type().to_string());
97
98        Ok(output)
99    }
100
101    /// <https://w3c.github.io/FileAPI/#readAsArrayBufferSyncSection>
102    fn ReadAsArrayBuffer(
103        &self,
104        cx: JSContext,
105        blob: &Blob,
106        can_gc: CanGc,
107    ) -> Fallible<RootedTraceableBox<HeapArrayBuffer>> {
108        // step 1
109        let blob_contents = FileReaderSync::get_blob_bytes(blob)?;
110
111        // step 2
112        rooted!(in(*cx) let mut array_buffer = ptr::null_mut::<JSObject>());
113
114        create_buffer_source::<ArrayBufferU8>(cx, &blob_contents, array_buffer.handle_mut(), can_gc)
115            .map_err(|_| Error::JSFailed)
116    }
117}
script/dom/filereadersync.rs

script/dom/
filereadersync.rs
