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Improve Blob.Size() speed by avoid reading content

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This commit is contained in:
Zhen Zhang 2016-08-16 23:17:54 +02:00
parent 49431be44a
commit 06e29c0497
1 changed files with 6 additions and 5 deletions
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11
components/script/dom/blob.rs
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@ -357,11 +357,12 @@ pub fn blob_parts_to_bytes(blobparts: Vec<BlobOrString>) -> Result<Vec<u8>, ()>
impl BlobMethods for Blob {
// https://w3c.github.io/FileAPI/#dfn-size
fn Size(&self) -> u64 {
// XXX: This will incur reading if file-based
match self.get_bytes() {
Ok(s) => s.len() as u64,
_ => 0,
}
match *self.blob_impl.borrow() {
BlobImpl::File(ref f) => f.size,
BlobImpl::Memory(ref v) => v.len() as u64,
BlobImpl::Sliced(ref parent, ref rel_pos) =>
rel_pos.to_abs_range(parent.Size() as usize).len() as u64,
}
}
// https://w3c.github.io/FileAPI/#dfn-type