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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "BaseAlgorithms.h"
#include "mozilla/dom/BufferSourceBinding.h"
#include "mozilla/dom/BufferSourceBindingFwd.h"
#include "mozilla/dom/TransformStreamDefaultController.h"
#include "mozilla/dom/UnionTypes.h"
namespace mozilla::dom::compression {
// Step 3 of
// https://compression.spec.whatwg.org/#dom-compressionstream-compressionstream
// Let transformAlgorithm be an algorithm which takes a chunk argument and
// runs the compress and enqueue a chunk algorithm with this and chunk.
MOZ_CAN_RUN_SCRIPT
void CompressionStreamAlgorithms::TransformCallbackImpl(
JS::Handle<JS::Value> aChunk, TransformStreamDefaultController& aController,
ErrorResult& aRv) {
AutoJSAPI jsapi;
if (!jsapi.Init(aController.GetParentObject())) {
aRv.ThrowUnknownError("Internal error");
return;
}
JSContext* cx = jsapi.cx();
// https://compression.spec.whatwg.org/#compress-and-enqueue-a-chunk
// Step 1: If chunk is not a BufferSource type, then throw a TypeError.
RootedUnion<OwningBufferSource> bufferSource(cx);
if (!bufferSource.Init(cx, aChunk)) {
aRv.MightThrowJSException();
aRv.StealExceptionFromJSContext(cx);
return;
}
// Step 2 - 5: (Done in CompressAndEnqueue)
ProcessTypedArraysFixed(
bufferSource,
[&](const Span<uint8_t>& aData) MOZ_CAN_RUN_SCRIPT_BOUNDARY {
CompressAndEnqueue(cx, aData, Flush::No, aController, aRv);
});
}
// Step 4 of
// https://compression.spec.whatwg.org/#dom-compressionstream-compressionstream
// Let flushAlgorithm be an algorithm which takes no argument and runs the
// compress flush and enqueue algorithm with this.
MOZ_CAN_RUN_SCRIPT void CompressionStreamAlgorithms::FlushCallbackImpl(
TransformStreamDefaultController& aController, ErrorResult& aRv) {
AutoJSAPI jsapi;
if (!jsapi.Init(aController.GetParentObject())) {
aRv.ThrowUnknownError("Internal error");
return;
}
JSContext* cx = jsapi.cx();
// https://compression.spec.whatwg.org/#compress-flush-and-enqueue
// Step 1 - 4: (Done in CompressAndEnqueue)
CompressAndEnqueue(cx, Span<const uint8_t>(), Flush::Yes, aController, aRv);
}
// Shared by:
// https://compression.spec.whatwg.org/#compress-and-enqueue-a-chunk
// https://compression.spec.whatwg.org/#compress-flush-and-enqueue
MOZ_CAN_RUN_SCRIPT void CompressionStreamAlgorithms::CompressAndEnqueue(
JSContext* aCx, Span<const uint8_t> aInput, Flush aFlush,
TransformStreamDefaultController& aController, ErrorResult& aRv) {
MOZ_ASSERT_IF(aFlush == Flush::Yes, !aInput.Length());
JS::RootedVector<JSObject*> array(aCx);
// Step 2: Let buffer be the result of compressing chunk with cs’s
// format and context.
// Step 3: If buffer is empty, return. (implicit as array will be empty then)
// Step 4: Let arrays be the result of buffer into one or more non-empty
// pieces and converting them into Uint8Arrays.
Compress(aCx, aInput, &array, aFlush, aRv);
if (aRv.Failed()) {
return;
}
// Step 5: For each Uint8Array array, enqueue array in cs's transform.
for (const auto& view : array) {
JS::Rooted<JS::Value> value(aCx, JS::ObjectValue(*view));
aController.Enqueue(aCx, value, aRv);
if (aRv.Failed()) {
return;
}
}
}
// Step 3 of
// https://compression.spec.whatwg.org/#dom-decompressionstream-decompressionstream
// Let transformAlgorithm be an algorithm which takes a chunk argument and
// runs the compress and enqueue a chunk algorithm with this and chunk.
MOZ_CAN_RUN_SCRIPT
void DecompressionStreamAlgorithms::TransformCallbackImpl(
JS::Handle<JS::Value> aChunk, TransformStreamDefaultController& aController,
ErrorResult& aRv) {
AutoJSAPI jsapi;
if (!jsapi.Init(aController.GetParentObject())) {
aRv.ThrowUnknownError("Internal error");
return;
}
JSContext* cx = jsapi.cx();
// https://compression.spec.whatwg.org/#decompress-and-enqueue-a-chunk
// Step 1: If chunk is not a BufferSource type, then throw a TypeError.
RootedUnion<OwningBufferSource> bufferSource(cx);
if (!bufferSource.Init(cx, aChunk)) {
aRv.MightThrowJSException();
aRv.StealExceptionFromJSContext(cx);
return;
}
// Step 2: Let buffer be the result of decompressing chunk with ds's format
// and context. If this results in an error, then throw a TypeError.
// Step 3 - 5: (Done in DecompressAndEnqueue)
ProcessTypedArraysFixed(
bufferSource,
[&](const Span<uint8_t>& aData) MOZ_CAN_RUN_SCRIPT_BOUNDARY {
DecompressAndEnqueue(cx, aData, Flush::No, aController, aRv);
});
}
// Step 4 of
// https://compression.spec.whatwg.org/#dom-decompressionstream-decompressionstream
// Let flushAlgorithm be an algorithm which takes no argument and runs the
// compress flush and enqueue algorithm with this.
MOZ_CAN_RUN_SCRIPT void DecompressionStreamAlgorithms::FlushCallbackImpl(
TransformStreamDefaultController& aController, ErrorResult& aRv) {
AutoJSAPI jsapi;
if (!jsapi.Init(aController.GetParentObject())) {
aRv.ThrowUnknownError("Internal error");
return;
}
JSContext* cx = jsapi.cx();
// https://compression.spec.whatwg.org/#decompress-flush-and-enqueue
// Step 1: Let buffer be the result of decompressing an empty input with
// ds's format and context, with the finish flag.
// Step 2 - 6: (Done in DecompressAndEnqueue)
DecompressAndEnqueue(cx, Span<const uint8_t>(), Flush::Yes, aController, aRv);
}
// Shared by:
// https://compression.spec.whatwg.org/#decompress-and-enqueue-a-chunk
// https://compression.spec.whatwg.org/#decompress-flush-and-enqueue
MOZ_CAN_RUN_SCRIPT void DecompressionStreamAlgorithms::DecompressAndEnqueue(
JSContext* aCx, Span<const uint8_t> aInput, Flush aFlush,
TransformStreamDefaultController& aController, ErrorResult& aRv) {
MOZ_ASSERT_IF(aFlush == Flush::Yes, !aInput.Length());
JS::RootedVector<JSObject*> array(aCx);
// Step 2: Let buffer be the result of decompressing chunk with ds’s format
// and context. If this results in an error, then throw a TypeError.
// Step 3: If buffer is empty, return.
// (Skipping, see https://github.com/whatwg/compression/issues/78)
// Step 4: Let arrays be the result of splitting buffer into one or more
// non-empty pieces and converting them into Uint8Arrays.
bool fullyConsumed = Decompress(aCx, aInput, &array, aFlush, aRv);
if (aRv.Failed()) {
return;
}
// Step 5: For each Uint8Array array, enqueue array in ds's transform.
for (const auto& view : array) {
JS::Rooted<JS::Value> value(aCx, JS::ObjectValue(*view));
aController.Enqueue(aCx, value, aRv);
if (aRv.Failed()) {
return;
}
}
// Step 6: If the end of the compressed input has been reached, and ds's
// context has not fully consumed chunk, then throw a TypeError.
if (mObservedStreamEnd && !fullyConsumed) {
aRv.ThrowTypeError("Unexpected input after the end of stream");
return;
}
// Step 3 of
// https://compression.spec.whatwg.org/#decompress-flush-and-enqueue
// If the end of the compressed input has not been reached, then throw a
// TypeError.
if (aFlush == Flush::Yes && !mObservedStreamEnd) {
aRv.ThrowTypeError("The input is ended without reaching the stream end");
return;
}
}
} // namespace mozilla::dom::compression
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