stream: commit pull-into descriptors after filling from queue

MattiasBuelens · ruyadorno · commit d352b0465a9f · 2025-01-05T13:05:22.000-05:00
Fixes: #56044 PR-URL: #56072 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Matthew Aitken <maitken033380023@gmail.com>
diff --git a/lib/internal/webstreams/readablestream.js b/lib/internal/webstreams/readablestream.js
@@ -94,6 +94,7 @@ const {
   ArrayBufferViewGetByteLength,
   ArrayBufferViewGetByteOffset,
   AsyncIterator,
+  canCopyArrayBuffer,
   cloneAsUint8Array,
   copyArrayBuffer,
   createPromiseCallback,
@@ -2552,6 +2553,15 @@ function readableByteStreamControllerCommitPullIntoDescriptor(stream, desc) {
   }
 }
 
+function readableByteStreamControllerCommitPullIntoDescriptors(stream, descriptors) {
+  for (let i = 0; i < descriptors.length; ++i) {
+    readableByteStreamControllerCommitPullIntoDescriptor(
+      stream,
+      descriptors[i],
+    );
+  }
+}
+
 function readableByteStreamControllerInvalidateBYOBRequest(controller) {
   if (controller[kState].byobRequest === null)
     return;
@@ -2758,11 +2768,11 @@ function readableByteStreamControllerRespondInClosedState(controller, desc) {
     stream,
   } = controller[kState];
   if (readableStreamHasBYOBReader(stream)) {
-    while (readableStreamGetNumReadIntoRequests(stream) > 0) {
-      readableByteStreamControllerCommitPullIntoDescriptor(
-        stream,
-        readableByteStreamControllerShiftPendingPullInto(controller));
+    const filledPullIntos = [];
+    for (let i = 0; i < readableStreamGetNumReadIntoRequests(stream); ++i) {
+      ArrayPrototypePush(filledPullIntos, readableByteStreamControllerShiftPendingPullInto(controller));
     }
+    readableByteStreamControllerCommitPullIntoDescriptors(stream, filledPullIntos);
   }
 }
 
@@ -2843,8 +2853,9 @@ function readableByteStreamControllerEnqueue(controller, chunk) {
       transferredBuffer,
       byteOffset,
       byteLength);
-    readableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(
+    const filledPullIntos = readableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(
       controller);
+    readableByteStreamControllerCommitPullIntoDescriptors(stream, filledPullIntos);
   } else {
     assert(!isReadableStreamLocked(stream));
     readableByteStreamControllerEnqueueChunkToQueue(
@@ -2937,6 +2948,7 @@ function readableByteStreamControllerFillPullIntoDescriptorFromQueue(
   const maxAlignedBytes = maxBytesFilled - (maxBytesFilled % elementSize);
   let totalBytesToCopyRemaining = maxBytesToCopy;
   let ready = false;
+  assert(!ArrayBufferPrototypeGetDetached(buffer));
   assert(bytesFilled < minimumFill);
   if (maxAlignedBytes >= minimumFill) {
     totalBytesToCopyRemaining = maxAlignedBytes - bytesFilled;
@@ -2952,12 +2964,12 @@ function readableByteStreamControllerFillPullIntoDescriptorFromQueue(
       totalBytesToCopyRemaining,
       headOfQueue.byteLength);
     const destStart = byteOffset + desc.bytesFilled;
-    const arrayBufferByteLength = ArrayBufferPrototypeGetByteLength(buffer);
-    if (arrayBufferByteLength - destStart < bytesToCopy) {
-      throw new ERR_INVALID_STATE.RangeError(
-        'view ArrayBuffer size is invalid');
-    }
-    assert(arrayBufferByteLength - destStart >= bytesToCopy);
+    assert(canCopyArrayBuffer(
+      buffer,
+      destStart,
+      headOfQueue.buffer,
+      headOfQueue.byteOffset,
+      bytesToCopy));
     copyArrayBuffer(
       buffer,
       destStart,
@@ -2991,26 +3003,30 @@ function readableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(
   const {
     closeRequested,
     pendingPullIntos,
-    stream,
   } = controller[kState];
   assert(!closeRequested);
+  const filledPullIntos = [];
   while (pendingPullIntos.length) {
     if (!controller[kState].queueTotalSize)
-      return;
+      break;
     const desc = pendingPullIntos[0];
     if (readableByteStreamControllerFillPullIntoDescriptorFromQueue(
       controller,
       desc)) {
       readableByteStreamControllerShiftPendingPullInto(controller);
-      readableByteStreamControllerCommitPullIntoDescriptor(stream, desc);
+      ArrayPrototypePush(filledPullIntos, desc);
     }
   }
+  return filledPullIntos;
 }
 
 function readableByteStreamControllerRespondInReadableState(
   controller,
   bytesWritten,
   desc) {
+  const {
+    stream,
+  } = controller[kState];
   const {
     buffer,
     bytesFilled,
@@ -3031,9 +3047,10 @@ function readableByteStreamControllerRespondInReadableState(
       controller,
       desc,
     );
-    readableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(
+    const filledPullIntos = readableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(
       controller,
     );
+    readableByteStreamControllerCommitPullIntoDescriptors(stream, filledPullIntos);
     return;
   }
 
@@ -3059,10 +3076,10 @@ function readableByteStreamControllerRespondInReadableState(
       ArrayBufferPrototypeGetByteLength(remainder));
   }
   desc.bytesFilled -= remainderSize;
-  readableByteStreamControllerCommitPullIntoDescriptor(
-    controller[kState].stream,
-    desc);
-  readableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+  const filledPullIntos = readableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+
+  readableByteStreamControllerCommitPullIntoDescriptor(stream, desc);
+  readableByteStreamControllerCommitPullIntoDescriptors(stream, filledPullIntos);
 }
 
 function readableByteStreamControllerRespondWithNewView(controller, view) {
diff --git a/lib/internal/webstreams/util.js b/lib/internal/webstreams/util.js
@@ -1,6 +1,8 @@
 'use strict';
 
 const {
+  ArrayBufferPrototypeGetByteLength,
+  ArrayBufferPrototypeGetDetached,
   ArrayBufferPrototypeSlice,
   ArrayPrototypePush,
   ArrayPrototypeShift,
@@ -107,6 +109,14 @@ function cloneAsUint8Array(view) {
   );
 }
 
+function canCopyArrayBuffer(toBuffer, toIndex, fromBuffer, fromIndex, count) {
+  return toBuffer !== fromBuffer &&
+    !ArrayBufferPrototypeGetDetached(toBuffer) &&
+    !ArrayBufferPrototypeGetDetached(fromBuffer) &&
+    toIndex + count <= ArrayBufferPrototypeGetByteLength(toBuffer) &&
+    fromIndex + count <= ArrayBufferPrototypeGetByteLength(fromBuffer);
+}
+
 function isBrandCheck(brand) {
   return (value) => {
     return value != null &&
@@ -261,6 +271,7 @@ module.exports = {
   ArrayBufferViewGetByteLength,
   ArrayBufferViewGetByteOffset,
   AsyncIterator,
+  canCopyArrayBuffer,
   createPromiseCallback,
   cloneAsUint8Array,
   copyArrayBuffer,
