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Complete Blob streaming and slicing support #209

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Complete Blob streaming and slicing support #209

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e62fabe
Add optional WHATWG Streams polyfill
matthargett Jul 22, 2026
4529fc4
Complete Blob streaming and slicing support
matthargett Jul 22, 2026
075ab25
Keep Streams implementations internally consistent
matthargett Jul 22, 2026
2a35a0d
Write Blob BYOB reads into caller buffers
matthargett Jul 22, 2026
8fe0b9e
Preserve Streams bundle bytes across source splits
matthargett Jul 26, 2026
35d40c9
Avoid per-stream Blob callback wrappers
matthargett Jul 26, 2026
bbecd3d
Use JSC-compatible Blob stream state key
matthargett Jul 26, 2026
2bfc18c
Share Blob stream source callbacks
matthargett Jul 26, 2026
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1 change: 1 addition & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -102,6 +102,7 @@ option(JSRUNTIMEHOST_POLYFILL_FILE "Include JsRuntimeHost Polyfill File and File
option(JSRUNTIMEHOST_POLYFILL_PERFORMANCE "Include JsRuntimeHost Polyfill Performance." ON)
option(JSRUNTIMEHOST_POLYFILL_TEXTDECODER "Include JsRuntimeHost Polyfill TextDecoder." ON)
option(JSRUNTIMEHOST_POLYFILL_TEXTENCODER "Include JsRuntimeHost Polyfill TextEncoder." ON)
option(JSRUNTIMEHOST_POLYFILL_STREAMS "Include JsRuntimeHost Polyfill Web Streams." ON)

# Sanitizers
option(ENABLE_SANITIZERS "Enable AddressSanitizer and UBSan" OFF)
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1 change: 1 addition & 0 deletions Polyfills/Blob/CMakeLists.txt
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@@ -1,5 +1,6 @@
set(SOURCES
"Include/Babylon/Polyfills/Blob.h"
"README.md"
"Source/Blob.cpp"
"Source/Blob.h")

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12 changes: 12 additions & 0 deletions Polyfills/Blob/README.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
# Blob

Provides the browser `Blob` constructor, byte/text readers, zero-copy Blob
composition and slicing, and a lazily pulled byte `ReadableStream`.

Call `Babylon::Polyfills::Streams::Initialize` before using `Blob.stream()` on
engines that do not provide Web Streams. Stream reads copy only the requested
chunk into JavaScript-owned memory; composing Blobs and slicing share immutable
native byte segments.

The focused tests are adapted from WPT `FileAPI/blob`, WebKit's Blob stream
chunk/crash regressions, and Firefox's large Blob `pipeTo` regression.
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