Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

buffer: improve blob read performance #42117

Merged
merged 1 commit into from Feb 27, 2022
Merged

buffer: improve blob read performance #42117

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Jump to
Jump to file
Failed to load files.
Diff view
Diff view
11 changes: 6 additions & 5 deletions lib/internal/blob.js
View file
Open in desktop
Expand Up @@ -64,6 +64,7 @@ const {

const kHandle = Symbol('kHandle');
const kState = Symbol('kState');
const kIndex = Symbol('kIndex');
const kType = Symbol('kType');
const kLength = Symbol('kLength');
const kArrayBufferPromise = Symbol('kArrayBufferPromise');
Expand Down Expand Up @@ -323,17 +324,17 @@ class Blob {
return new lazyReadableStream({
async start() {
this[kState] = await self.arrayBuffer();
this[kIndex] = 0;
},

pull(controller) {
if (this[kState].byteLength <= kMaxChunkSize) {
controller.enqueue(new Uint8Array(this[kState]));
if (this[kState].byteLength - this[kIndex] <= kMaxChunkSize) {
controller.enqueue(new Uint8Array(this[kState], this[kIndex]));
controller.close();
this[kState] = undefined;
} else {
const slice = this[kState].slice(0, kMaxChunkSize);
this[kState] = this[kState].slice(kMaxChunkSize);
controller.enqueue(new Uint8Array(slice));
controller.enqueue(new Uint8Array(this[kState], this[kIndex], kMaxChunkSize));
this[kIndex] += kMaxChunkSize;
}
}
});
Expand Down