Bug 1864406 - Add ReadableStreamBYOBReader.prototype.read(view, { min…

… }). r=saschanaz,webidl,smaug

Implements whatwg/streams#1145

Differential Revision: https://phabricator.services.mozilla.com/D226225

UltraBlame original commit: 56a71d42ee3220891aa1cb2dfae5df8f544865f9

dom/streams/ReadableByteStreamController.cpp

@@ -655,6 +655,8 @@ aByteLength
 uint64_t
 aBytesFilled
 uint64_t
+aMinimumFill
+uint64_t
 aElementSize
 Constructor
 aViewConstructor
@@ -682,6 +684,10 @@ mBytesFilled
 (
 aBytesFilled
 )
+mMinimumFill
+(
+aMinimumFill
+)
 mElementSize
 (
 aElementSize
@@ -827,6 +833,16 @@ aBytesFilled
 ;
 }
 uint64_t
+MinimumFill
+(
+)
+const
+{
+return
+mMinimumFill
+;
+}
+uint64_t
 ElementSize
 (
 )
@@ -915,6 +931,11 @@ mBytesFilled
 0
 ;
 uint64_t
+mMinimumFill
+=
+0
+;
+uint64_t
 mElementSize
 =
 0
@@ -1776,13 +1797,23 @@ getFirst
 ;
 if
 (
+(
 firstPendingPullInto
 -
 >
 BytesFilled
 (
 )
+%
+firstPendingPullInto
+-
 >
+ElementSize
+(
+)
+)
+!
+=
 0
 )
 {
@@ -2927,12 +2958,21 @@ Closed
 {
 MOZ_ASSERT
 (
+(
 pullIntoDescriptor
 -
 >
 BytesFilled
 (
 )
+%
+pullIntoDescriptor
+-
+>
+ElementSize
+(
+)
+)
 =
 =
 0
@@ -4778,6 +4818,7 @@ autoAllocateChunkSize
 autoAllocateChunkSize
 0
 1
+1
 PullIntoDescriptor
 :
 :
@@ -5243,12 +5284,21 @@ aRv
 {
 MOZ_ASSERT
 (
+(
 aFirstDescriptor
 -
 >
 BytesFilled
 (
 )
+%
+aFirstDescriptor
+-
+>
+ElementSize
+(
+)
+)
 =
 =
 0
@@ -5515,7 +5565,7 @@ BytesFilled
 aPullIntoDescriptor
 -
 >
-ElementSize
+MinimumFill
 (
 )
 )
@@ -6534,37 +6584,6 @@ aRv
 )
 {
 size_t
-elementSize
-=
-aPullIntoDescriptor
--
->
-ElementSize
-(
-)
-;
-size_t
-currentAlignedBytes
-=
-aPullIntoDescriptor
--
->
-BytesFilled
-(
-)
--
-(
-aPullIntoDescriptor
--
->
-BytesFilled
-(
-)
-%
-elementSize
-)
-;
-size_t
 maxBytesToCopy
 =
 std
@@ -6620,31 +6639,62 @@ BytesFilled
 maxBytesToCopy
 ;
 size_t
-maxAlignedBytes
+totalBytesToCopyRemaining
 =
-maxBytesFilled
+maxBytesToCopy
+;
+bool
+ready
+=
+false
+;
+MOZ_ASSERT
+(
+aPullIntoDescriptor
 -
+>
+BytesFilled
 (
-maxBytesFilled
-%
-elementSize
+)
+<
+aPullIntoDescriptor
+-
+>
+MinimumFill
+(
+)
 )
 ;
 size_t
-totalBytesToCopyRemaining
+remainderBytes
 =
-maxBytesToCopy
+maxBytesFilled
+%
+aPullIntoDescriptor
+-
+>
+ElementSize
+(
+)
 ;
-bool
-ready
+size_t
+maxAlignedBytes
 =
-false
+maxBytesFilled
+-
+remainderBytes
 ;
 if
 (
 maxAlignedBytes
 >
-currentAlignedBytes
+=
+aPullIntoDescriptor
+-
+>
+MinimumFill
+(
+)
 )
 {
 totalBytesToCopyRemaining
@@ -6930,7 +6980,7 @@ BytesFilled
 aPullIntoDescriptor
 -
 >
-ElementSize
+MinimumFill
 (
 )
 )
@@ -6958,6 +7008,8 @@ JSObject
 *
 >
 aView
+uint64_t
+aMin
 ReadIntoRequest
 *
 aReadIntoRequest
@@ -7048,6 +7100,36 @@ type
 )
 ;
 }
+uint64_t
+minimumFill
+=
+aMin
+*
+elementSize
+;
+MOZ_ASSERT
+(
+minimumFill
+<
+=
+JS_GetArrayBufferViewByteLength
+(
+aView
+)
+)
+;
+MOZ_ASSERT
+(
+(
+minimumFill
+%
+elementSize
+)
+=
+=
+0
+)
+;
 size_t
 byteOffset
 =
@@ -7215,6 +7297,7 @@ buffer
 byteOffset
 byteLength
 0
+minimumFill
 elementSize
 ctor
 ReaderType

dom/streams/ReadableByteStreamController.h

@@ -809,6 +809,8 @@ JSObject
 *
 >
 aView
+uint64_t
+aMin
 ReadIntoRequest
 *
 aReadIntoRequest