Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	node_blob.cc	Lines:	240	279	86.0 %
Date:	2022-08-28 04:20:35	Branches:	78	136	57.4 %


#include "node_blob.h"
#include "async_wrap-inl.h"
#include "base_object-inl.h"
#include "env-inl.h"
#include "memory_tracker-inl.h"
#include "node_errors.h"
#include "node_external_reference.h"
#include "threadpoolwork-inl.h"
#include "v8.h"

#include <algorithm>

namespace node {

using v8::Array;
using v8::ArrayBuffer;
using v8::ArrayBufferView;
using v8::BackingStore;
using v8::Context;
using v8::EscapableHandleScope;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Isolate;
using v8::Local;
using v8::MaybeLocal;
using v8::Number;
using v8::Object;
using v8::String;
using v8::Uint32;
using v8::Undefined;
using v8::Value;

void Blob::Initialize(
    Local<Object> target,
    Local<Value> unused,
    Local<Context> context,
    void* priv) {
  Environment* env = Environment::GetCurrent(context);

  BlobBindingData* const binding_data =
      env->AddBindingData<BlobBindingData>(context, target);
  if (binding_data == nullptr) return;

  SetMethod(context, target, "createBlob", New);
  SetMethod(context, target, "storeDataObject", StoreDataObject);
  SetMethod(context, target, "getDataObject", GetDataObject);
  SetMethod(context, target, "revokeDataObject", RevokeDataObject);
  FixedSizeBlobCopyJob::Initialize(env, target);
}

Local<FunctionTemplate> Blob::GetConstructorTemplate(Environment* env) {
  Local<FunctionTemplate> tmpl = env->blob_constructor_template();
  if (tmpl.IsEmpty()) {
    Isolate* isolate = env->isolate();
    tmpl = NewFunctionTemplate(isolate, nullptr);
    tmpl->InstanceTemplate()->SetInternalFieldCount(
        BaseObject::kInternalFieldCount);
    tmpl->Inherit(BaseObject::GetConstructorTemplate(env));
    tmpl->SetClassName(
        FIXED_ONE_BYTE_STRING(env->isolate(), "Blob"));
    SetProtoMethod(isolate, tmpl, "toArrayBuffer", ToArrayBuffer);
    SetProtoMethod(isolate, tmpl, "slice", ToSlice);
    env->set_blob_constructor_template(tmpl);
  }
  return tmpl;
}

bool Blob::HasInstance(Environment* env, v8::Local<v8::Value> object) {
  return GetConstructorTemplate(env)->HasInstance(object);
}

BaseObjectPtr<Blob> Blob::Create(
    Environment* env,
    const std::vector<BlobEntry> store,
    size_t length) {

  HandleScope scope(env->isolate());

  Local<Function> ctor;
  if (!GetConstructorTemplate(env)->GetFunction(env->context()).ToLocal(&ctor))
    return BaseObjectPtr<Blob>();

  Local<Object> obj;
  if (!ctor->NewInstance(env->context()).ToLocal(&obj))
    return BaseObjectPtr<Blob>();

  return MakeBaseObject<Blob>(env, obj, store, length);
}

void Blob::New(const FunctionCallbackInfo<Value>& args) {
  Environment* env = Environment::GetCurrent(args);
  CHECK(args[0]->IsArray());  // sources
  CHECK(args[1]->IsUint32());  // length

  std::vector<BlobEntry> entries;

  size_t length = args[1].As<Uint32>()->Value();
  size_t len = 0;
  Local<Array> ary = args[0].As<Array>();
  for (size_t n = 0; n < ary->Length(); n++) {
    Local<Value> entry;
    if (!ary->Get(env->context(), n).ToLocal(&entry))
      return;
    CHECK(entry->IsArrayBufferView() || Blob::HasInstance(env, entry));
    if (entry->IsArrayBufferView()) {
      Local<ArrayBufferView> view = entry.As<ArrayBufferView>();
      CHECK_EQ(view->ByteOffset(), 0);
      std::shared_ptr<BackingStore> store = view->Buffer()->GetBackingStore();
      size_t byte_length = view->ByteLength();
      view->Buffer()->Detach();  // The Blob will own the backing store now.
      entries.emplace_back(BlobEntry{std::move(store), byte_length, 0});
      len += byte_length;
    } else {
      Blob* blob;
      ASSIGN_OR_RETURN_UNWRAP(&blob, entry);
      auto source = blob->entries();
      entries.insert(entries.end(), source.begin(), source.end());
      len += blob->length();
    }
  }
  CHECK_EQ(length, len);

  BaseObjectPtr<Blob> blob = Create(env, entries, length);
  if (blob)
    args.GetReturnValue().Set(blob->object());
}

void Blob::ToArrayBuffer(const FunctionCallbackInfo<Value>& args) {
  Environment* env = Environment::GetCurrent(args);
  Blob* blob;
  ASSIGN_OR_RETURN_UNWRAP(&blob, args.Holder());
  Local<Value> ret;
  if (blob->GetArrayBuffer(env).ToLocal(&ret))
    args.GetReturnValue().Set(ret);
}

void Blob::ToSlice(const FunctionCallbackInfo<Value>& args) {
  Environment* env = Environment::GetCurrent(args);
  Blob* blob;
  ASSIGN_OR_RETURN_UNWRAP(&blob, args.Holder());
  CHECK(args[0]->IsUint32());
  CHECK(args[1]->IsUint32());
  size_t start = args[0].As<Uint32>()->Value();
  size_t end = args[1].As<Uint32>()->Value();
  BaseObjectPtr<Blob> slice = blob->Slice(env, start, end);
  if (slice)
    args.GetReturnValue().Set(slice->object());
}

void Blob::MemoryInfo(MemoryTracker* tracker) const {
  tracker->TrackFieldWithSize("store", length_);
}

MaybeLocal<Value> Blob::GetArrayBuffer(Environment* env) {
  EscapableHandleScope scope(env->isolate());
  size_t len = length();
  std::shared_ptr<BackingStore> store =
      ArrayBuffer::NewBackingStore(env->isolate(), len);
  if (len > 0) {
    unsigned char* dest = static_cast<unsigned char*>(store->Data());
    size_t total = 0;
    for (const auto& entry : entries()) {
      unsigned char* src = static_cast<unsigned char*>(entry.store->Data());
      src += entry.offset;
      memcpy(dest, src, entry.length);
      dest += entry.length;
      total += entry.length;
      CHECK_LE(total, len);
    }
  }

  return scope.Escape(ArrayBuffer::New(env->isolate(), store));
}

BaseObjectPtr<Blob> Blob::Slice(Environment* env, size_t start, size_t end) {
  CHECK_LE(start, length());
  CHECK_LE(end, length());
  CHECK_LE(start, end);

  std::vector<BlobEntry> slices;
  size_t total = end - start;
  size_t remaining = total;

  if (total == 0) return Create(env, slices, 0);

  for (const auto& entry : entries()) {
    if (start + entry.offset > entry.store->ByteLength()) {
      start -= entry.length;
      continue;
    }

    size_t offset = entry.offset + start;
    size_t len = std::min(remaining, entry.store->ByteLength() - offset);
    slices.emplace_back(BlobEntry{entry.store, len, offset});

    remaining -= len;
    start = 0;

    if (remaining == 0)
      break;
  }

  return Create(env, slices, total);
}

Blob::Blob(
    Environment* env,
    v8::Local<v8::Object> obj,
    const std::vector<BlobEntry>& store,
    size_t length)
    : BaseObject(env, obj),
      store_(store),
      length_(length) {
  MakeWeak();
}

BaseObjectPtr<BaseObject>
Blob::BlobTransferData::Deserialize(
    Environment* env,
    Local<Context> context,
    std::unique_ptr<worker::TransferData> self) {
  if (context != env->context()) {
    THROW_ERR_MESSAGE_TARGET_CONTEXT_UNAVAILABLE(env);
    return {};
  }
  return Blob::Create(env, store_, length_);
}

BaseObject::TransferMode Blob::GetTransferMode() const {
  return BaseObject::TransferMode::kCloneable;
}

std::unique_ptr<worker::TransferData> Blob::CloneForMessaging() const {
  return std::make_unique<BlobTransferData>(store_, length_);
}

void Blob::StoreDataObject(const v8::FunctionCallbackInfo<v8::Value>& args) {
  Environment* env = Environment::GetCurrent(args);
  BlobBindingData* binding_data =
      Environment::GetBindingData<BlobBindingData>(args);

  CHECK(args[0]->IsString());  // ID key
  CHECK(Blob::HasInstance(env, args[1]));  // Blob
  CHECK(args[2]->IsUint32());  // Length
  CHECK(args[3]->IsString());  // Type

  Utf8Value key(env->isolate(), args[0]);
  Blob* blob;
  ASSIGN_OR_RETURN_UNWRAP(&blob, args[1]);

  size_t length = args[2].As<Uint32>()->Value();
  Utf8Value type(env->isolate(), args[3]);

  binding_data->store_data_object(
      std::string(*key, key.length()),
      BlobBindingData::StoredDataObject(
        BaseObjectPtr<Blob>(blob),
        length,
        std::string(*type, type.length())));
}

void Blob::RevokeDataObject(const v8::FunctionCallbackInfo<v8::Value>& args) {
  BlobBindingData* binding_data =
      Environment::GetBindingData<BlobBindingData>(args);

  Environment* env = Environment::GetCurrent(args);
  CHECK(args[0]->IsString());  // ID key

  Utf8Value key(env->isolate(), args[0]);

  binding_data->revoke_data_object(std::string(*key, key.length()));
}

void Blob::GetDataObject(const v8::FunctionCallbackInfo<v8::Value>& args) {
  BlobBindingData* binding_data =
      Environment::GetBindingData<BlobBindingData>(args);

  Environment* env = Environment::GetCurrent(args);
  CHECK(args[0]->IsString());

  Utf8Value key(env->isolate(), args[0]);

  BlobBindingData::StoredDataObject stored =
      binding_data->get_data_object(std::string(*key, key.length()));
  if (stored.blob) {
    Local<Value> type;
    if (!String::NewFromUtf8(
            env->isolate(),
            stored.type.c_str(),
            v8::NewStringType::kNormal,
            static_cast<int>(stored.type.length())).ToLocal(&type)) {
      return;
    }

    Local<Value> values[] = {
      stored.blob->object(),
      Uint32::NewFromUnsigned(env->isolate(), stored.length),
      type
    };

    args.GetReturnValue().Set(
        Array::New(
            env->isolate(),
            values,
            arraysize(values)));
  }
}

FixedSizeBlobCopyJob::FixedSizeBlobCopyJob(
    Environment* env,
    Local<Object> object,
    Blob* blob,
    FixedSizeBlobCopyJob::Mode mode)
    : AsyncWrap(env, object, AsyncWrap::PROVIDER_FIXEDSIZEBLOBCOPY),
      ThreadPoolWork(env),
      mode_(mode) {
  if (mode == FixedSizeBlobCopyJob::Mode::SYNC) MakeWeak();
  source_ = blob->entries();
  length_ = blob->length();
}

void FixedSizeBlobCopyJob::AfterThreadPoolWork(int status) {
  Environment* env = AsyncWrap::env();
  CHECK_EQ(mode_, Mode::ASYNC);
  CHECK(status == 0 || status == UV_ECANCELED);
  std::unique_ptr<FixedSizeBlobCopyJob> ptr(this);
  HandleScope handle_scope(env->isolate());
  Context::Scope context_scope(env->context());
  Local<Value> args[2];

  if (status == UV_ECANCELED) {
    args[0] = Number::New(env->isolate(), status),
    args[1] = Undefined(env->isolate());
  } else {
    args[0] = Undefined(env->isolate());
    args[1] = ArrayBuffer::New(env->isolate(), destination_);
  }

  ptr->MakeCallback(env->ondone_string(), arraysize(args), args);
}

void FixedSizeBlobCopyJob::DoThreadPoolWork() {
  unsigned char* dest = static_cast<unsigned char*>(destination_->Data());
  if (length_ > 0) {
    size_t total = 0;
    for (const auto& entry : source_) {
      unsigned char* src = static_cast<unsigned char*>(entry.store->Data());
      src += entry.offset;
      memcpy(dest, src, entry.length);
      dest += entry.length;
      total += entry.length;
      CHECK_LE(total, length_);
    }
  }
}

void FixedSizeBlobCopyJob::MemoryInfo(MemoryTracker* tracker) const {
  tracker->TrackFieldWithSize("source", length_);
  tracker->TrackFieldWithSize(
      "destination",
      destination_ ? destination_->ByteLength() : 0);
}

void FixedSizeBlobCopyJob::Initialize(Environment* env, Local<Object> target) {
  Isolate* isolate = env->isolate();
  v8::Local<v8::FunctionTemplate> job = NewFunctionTemplate(isolate, New);
  job->Inherit(AsyncWrap::GetConstructorTemplate(env));
  job->InstanceTemplate()->SetInternalFieldCount(
      AsyncWrap::kInternalFieldCount);
  SetProtoMethod(isolate, job, "run", Run);
  SetConstructorFunction(env->context(), target, "FixedSizeBlobCopyJob", job);
}

void FixedSizeBlobCopyJob::New(const FunctionCallbackInfo<Value>& args) {
  static constexpr size_t kMaxSyncLength = 4096;
  static constexpr size_t kMaxEntryCount = 4;

  Environment* env = Environment::GetCurrent(args);
  CHECK(args.IsConstructCall());
  CHECK(args[0]->IsObject());
  CHECK(Blob::HasInstance(env, args[0]));

  Blob* blob;
  ASSIGN_OR_RETURN_UNWRAP(&blob, args[0]);

  // This is a fairly arbitrary heuristic. We want to avoid deferring to
  // the threadpool if the amount of data being copied is small and there
  // aren't that many entries to copy.
  FixedSizeBlobCopyJob::Mode mode =
      (blob->length() < kMaxSyncLength &&
       blob->entries().size() < kMaxEntryCount) ?
          FixedSizeBlobCopyJob::Mode::SYNC :
          FixedSizeBlobCopyJob::Mode::ASYNC;

  new FixedSizeBlobCopyJob(env, args.This(), blob, mode);
}

void FixedSizeBlobCopyJob::Run(const FunctionCallbackInfo<Value>& args) {
  Environment* env = Environment::GetCurrent(args);
  FixedSizeBlobCopyJob* job;
  ASSIGN_OR_RETURN_UNWRAP(&job, args.Holder());
  job->destination_ =
      ArrayBuffer::NewBackingStore(env->isolate(), job->length_);
  if (job->mode() == FixedSizeBlobCopyJob::Mode::ASYNC)
    return job->ScheduleWork();

  job->DoThreadPoolWork();
  args.GetReturnValue().Set(
      ArrayBuffer::New(env->isolate(), job->destination_));
}

void FixedSizeBlobCopyJob::RegisterExternalReferences(
    ExternalReferenceRegistry* registry) {
  registry->Register(New);
  registry->Register(Run);
}

void BlobBindingData::StoredDataObject::MemoryInfo(
    MemoryTracker* tracker) const {
  tracker->TrackField("blob", blob);
  tracker->TrackFieldWithSize("type", type.length());
}

BlobBindingData::StoredDataObject::StoredDataObject(
    const BaseObjectPtr<Blob>& blob_,
    size_t length_,
    const std::string& type_)
    : blob(blob_),
      length(length_),
      type(type_) {}

BlobBindingData::BlobBindingData(Environment* env, Local<Object> wrap)
    : SnapshotableObject(env, wrap, type_int) {
  MakeWeak();
}

void BlobBindingData::MemoryInfo(MemoryTracker* tracker) const {
  tracker->TrackField("data_objects", data_objects_);
}

void BlobBindingData::store_data_object(
    const std::string& uuid,
    const BlobBindingData::StoredDataObject& object) {
  data_objects_[uuid] = object;
}

void BlobBindingData::revoke_data_object(const std::string& uuid) {
  if (data_objects_.find(uuid) == data_objects_.end()) {
    return;
  }
  data_objects_.erase(uuid);
  CHECK_EQ(data_objects_.find(uuid), data_objects_.end());
}

BlobBindingData::StoredDataObject BlobBindingData::get_data_object(
    const std::string& uuid) {
  auto entry = data_objects_.find(uuid);
  if (entry == data_objects_.end())
    return BlobBindingData::StoredDataObject {};
  return entry->second;
}

void BlobBindingData::Deserialize(Local<Context> context,
                                  Local<Object> holder,
                                  int index,
                                  InternalFieldInfoBase* info) {
  DCHECK_EQ(index, BaseObject::kEmbedderType);
  HandleScope scope(context->GetIsolate());
  Environment* env = Environment::GetCurrent(context);
  BlobBindingData* binding =
      env->AddBindingData<BlobBindingData>(context, holder);
  CHECK_NOT_NULL(binding);
}

bool BlobBindingData::PrepareForSerialization(Local<Context> context,
                                              v8::SnapshotCreator* creator) {
  // Stored blob objects are not actually persisted.
  // Return true because we need to maintain the reference to the binding from
  // JS land.
  return true;
}

InternalFieldInfoBase* BlobBindingData::Serialize(int index) {
  DCHECK_EQ(index, BaseObject::kEmbedderType);
  InternalFieldInfo* info =
      InternalFieldInfoBase::New<InternalFieldInfo>(type());
  return info;
}

void Blob::RegisterExternalReferences(ExternalReferenceRegistry* registry) {
  registry->Register(Blob::New);
  registry->Register(Blob::ToArrayBuffer);
  registry->Register(Blob::ToSlice);
  registry->Register(Blob::StoreDataObject);
  registry->Register(Blob::GetDataObject);
  registry->Register(Blob::RevokeDataObject);

  FixedSizeBlobCopyJob::RegisterExternalReferences(registry);
}

}  // namespace node

NODE_MODULE_CONTEXT_AWARE_INTERNAL(blob, node::Blob::Initialize)
NODE_MODULE_EXTERNAL_REFERENCE(blob, node::Blob::RegisterExternalReferences)


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			#include "node_blob.h"
2			#include "async_wrap-inl.h"
3			#include "base_object-inl.h"
4			#include "env-inl.h"
5			#include "memory_tracker-inl.h"
6			#include "node_errors.h"
7			#include "node_external_reference.h"
8			#include "threadpoolwork-inl.h"
9			#include "v8.h"
10
11			#include <algorithm>
12
13			namespace node {
14
15			using v8::Array;
16			using v8::ArrayBuffer;
17			using v8::ArrayBufferView;
18			using v8::BackingStore;
19			using v8::Context;
20			using v8::EscapableHandleScope;
21			using v8::Function;
22			using v8::FunctionCallbackInfo;
23			using v8::FunctionTemplate;
24			using v8::HandleScope;
25			using v8::Isolate;
26			using v8::Local;
27			using v8::MaybeLocal;
28			using v8::Number;
29			using v8::Object;
30			using v8::String;
31			using v8::Uint32;
32			using v8::Undefined;
33			using v8::Value;
34
35		775	void Blob::Initialize(
36			Local<Object> target,
37			Local<Value> unused,
38			Local<Context> context,
39			void* priv) {
40		775	Environment* env = Environment::GetCurrent(context);
41
42			BlobBindingData* const binding_data =
43		775	env->AddBindingData<BlobBindingData>(context, target);
44	✗✓	775	if (binding_data == nullptr) return;
45
46		775	SetMethod(context, target, "createBlob", New);
47		775	SetMethod(context, target, "storeDataObject", StoreDataObject);
48		775	SetMethod(context, target, "getDataObject", GetDataObject);
49		775	SetMethod(context, target, "revokeDataObject", RevokeDataObject);
50		775	FixedSizeBlobCopyJob::Initialize(env, target);
51			}
52
53		174	Local<FunctionTemplate> Blob::GetConstructorTemplate(Environment* env) {
54		174	Local<FunctionTemplate> tmpl = env->blob_constructor_template();
55	✓✓	174	if (tmpl.IsEmpty()) {
56		10	Isolate* isolate = env->isolate();
57		10	tmpl = NewFunctionTemplate(isolate, nullptr);
58		20	tmpl->InstanceTemplate()->SetInternalFieldCount(
59			BaseObject::kInternalFieldCount);
60		10	tmpl->Inherit(BaseObject::GetConstructorTemplate(env));
61		10	tmpl->SetClassName(
62			FIXED_ONE_BYTE_STRING(env->isolate(), "Blob"));
63		10	SetProtoMethod(isolate, tmpl, "toArrayBuffer", ToArrayBuffer);
64		10	SetProtoMethod(isolate, tmpl, "slice", ToSlice);
65		10	env->set_blob_constructor_template(tmpl);
66			}
67		174	return tmpl;
68			}
69
70		56	bool Blob::HasInstance(Environment* env, v8::Local<v8::Value> object) {
71		112	return GetConstructorTemplate(env)->HasInstance(object);
72			}
73
74		118	BaseObjectPtr<Blob> Blob::Create(
75			Environment* env,
76			const std::vector<BlobEntry> store,
77			size_t length) {
78
79		236	HandleScope scope(env->isolate());
80
81			Local<Function> ctor;
82	✗✓	354	if (!GetConstructorTemplate(env)->GetFunction(env->context()).ToLocal(&ctor))
83			return BaseObjectPtr<Blob>();
84
85			Local<Object> obj;
86	✗✓	236	if (!ctor->NewInstance(env->context()).ToLocal(&obj))
87			return BaseObjectPtr<Blob>();
88
89		118	return MakeBaseObject<Blob>(env, obj, store, length);
90			}
91
92		104	void Blob::New(const FunctionCallbackInfo<Value>& args) {
93		104	Environment* env = Environment::GetCurrent(args);
94	✗✓	104	CHECK(args[0]->IsArray()); // sources
95	✗✓	104	CHECK(args[1]->IsUint32()); // length
96
97		104	std::vector<BlobEntry> entries;
98
99		208	size_t length = args[1].As<Uint32>()->Value();
100	✓✗	104	size_t len = 0;
101		104	Local<Array> ary = args[0].As<Array>();
102	✓✓	496	for (size_t n = 0; n < ary->Length(); n++) {
103			Local<Value> entry;
104	✗✓	288	if (!ary->Get(env->context(), n).ToLocal(&entry))
105			return;
106	✓✓✗✓ ✗✓	144	CHECK(entry->IsArrayBufferView() \|\| Blob::HasInstance(env, entry));
107	✓✓	144	if (entry->IsArrayBufferView()) {
108		140	Local<ArrayBufferView> view = entry.As<ArrayBufferView>();
109	✗✓	140	CHECK_EQ(view->ByteOffset(), 0);
110		280	std::shared_ptr<BackingStore> store = view->Buffer()->GetBackingStore();
111		140	size_t byte_length = view->ByteLength();
112		280	view->Buffer()->Detach(); // The Blob will own the backing store now.
113		140	entries.emplace_back(BlobEntry{std::move(store), byte_length, 0});
114		140	len += byte_length;
115			} else {
116			Blob* blob;
117	✗✓	4	ASSIGN_OR_RETURN_UNWRAP(&blob, entry);
118		4	auto source = blob->entries();
119		4	entries.insert(entries.end(), source.begin(), source.end());
120		4	len += blob->length();
121			}
122			}
123	✗✓	104	CHECK_EQ(length, len);
124
125		208	BaseObjectPtr<Blob> blob = Create(env, entries, length);
126	✓✗	104	if (blob)
127		208	args.GetReturnValue().Set(blob->object());
128			}
129
130			void Blob::ToArrayBuffer(const FunctionCallbackInfo<Value>& args) {
131			Environment* env = Environment::GetCurrent(args);
132			Blob* blob;
133			ASSIGN_OR_RETURN_UNWRAP(&blob, args.Holder());
134			Local<Value> ret;
135			if (blob->GetArrayBuffer(env).ToLocal(&ret))
136			args.GetReturnValue().Set(ret);
137			}
138
139		13	void Blob::ToSlice(const FunctionCallbackInfo<Value>& args) {
140		13	Environment* env = Environment::GetCurrent(args);
141			Blob* blob;
142	✗✓	13	ASSIGN_OR_RETURN_UNWRAP(&blob, args.Holder());
143	✗✓	13	CHECK(args[0]->IsUint32());
144	✗✓	13	CHECK(args[1]->IsUint32());
145	✓✗	26	size_t start = args[0].As<Uint32>()->Value();
146		26	size_t end = args[1].As<Uint32>()->Value();
147		26	BaseObjectPtr<Blob> slice = blob->Slice(env, start, end);
148	✓✗	13	if (slice)
149		26	args.GetReturnValue().Set(slice->object());
150			}
151
152			void Blob::MemoryInfo(MemoryTracker* tracker) const {
153			tracker->TrackFieldWithSize("store", length_);
154			}
155
156			MaybeLocal<Value> Blob::GetArrayBuffer(Environment* env) {
157			EscapableHandleScope scope(env->isolate());
158			size_t len = length();
159			std::shared_ptr<BackingStore> store =
160			ArrayBuffer::NewBackingStore(env->isolate(), len);
161			if (len > 0) {
162			unsigned char* dest = static_cast<unsigned char*>(store->Data());
163			size_t total = 0;
164			for (const auto& entry : entries()) {
165			unsigned char* src = static_cast<unsigned char*>(entry.store->Data());
166			src += entry.offset;
167			memcpy(dest, src, entry.length);
168			dest += entry.length;
169			total += entry.length;
170			CHECK_LE(total, len);
171			}
172			}
173
174			return scope.Escape(ArrayBuffer::New(env->isolate(), store));
175			}
176
177		13	BaseObjectPtr<Blob> Blob::Slice(Environment* env, size_t start, size_t end) {
178	✗✓	13	CHECK_LE(start, length());
179	✗✓	13	CHECK_LE(end, length());
180	✗✓	13	CHECK_LE(start, end);
181
182		26	std::vector<BlobEntry> slices;
183		13	size_t total = end - start;
184		13	size_t remaining = total;
185
186	✓✓	13	if (total == 0) return Create(env, slices, 0);
187
188	✓✗	23	for (const auto& entry : entries()) {
189	✗✓	14	if (start + entry.offset > entry.store->ByteLength()) {
190			start -= entry.length;
191			continue;
192			}
193
194		14	size_t offset = entry.offset + start;
195		14	size_t len = std::min(remaining, entry.store->ByteLength() - offset);
196		14	slices.emplace_back(BlobEntry{entry.store, len, offset});
197
198		14	remaining -= len;
199		14	start = 0;
200
201	✓✓	14	if (remaining == 0)
202		9	break;
203			}
204
205		9	return Create(env, slices, total);
206			}
207
208		118	Blob::Blob(
209			Environment* env,
210			v8::Local<v8::Object> obj,
211			const std::vector<BlobEntry>& store,
212		118	size_t length)
213			: BaseObject(env, obj),
214			store_(store),
215		118	length_(length) {
216		118	MakeWeak();
217		118	}
218
219			BaseObjectPtr<BaseObject>
220		1	Blob::BlobTransferData::Deserialize(
221			Environment* env,
222			Local<Context> context,
223			std::unique_ptr<worker::TransferData> self) {
224	✗✓	2	if (context != env->context()) {
225			THROW_ERR_MESSAGE_TARGET_CONTEXT_UNAVAILABLE(env);
226			return {};
227			}
228		1	return Blob::Create(env, store_, length_);
229			}
230
231		1	BaseObject::TransferMode Blob::GetTransferMode() const {
232		1	return BaseObject::TransferMode::kCloneable;
233			}
234
235		1	std::unique_ptr<worker::TransferData> Blob::CloneForMessaging() const {
236		1	return std::make_unique<BlobTransferData>(store_, length_);
237			}
238
239		2	void Blob::StoreDataObject(const v8::FunctionCallbackInfo<v8::Value>& args) {
240		2	Environment* env = Environment::GetCurrent(args);
241			BlobBindingData* binding_data =
242		2	Environment::GetBindingData<BlobBindingData>(args);
243
244	✗✓	4	CHECK(args[0]->IsString()); // ID key
245	✗✓	2	CHECK(Blob::HasInstance(env, args[1])); // Blob
246	✗✓	2	CHECK(args[2]->IsUint32()); // Length
247	✗✓	4	CHECK(args[3]->IsString()); // Type
248
249		2	Utf8Value key(env->isolate(), args[0]);
250			Blob* blob;
251	✗✓	2	ASSIGN_OR_RETURN_UNWRAP(&blob, args[1]);
252
253	✓✗	4	size_t length = args[2].As<Uint32>()->Value();
254		2	Utf8Value type(env->isolate(), args[3]);
255
256		2	binding_data->store_data_object(
257		4	std::string(*key, key.length()),
258		4	BlobBindingData::StoredDataObject(
259		4	BaseObjectPtr<Blob>(blob),
260			length,
261		4	std::string(*type, type.length())));
262			}
263
264		2	void Blob::RevokeDataObject(const v8::FunctionCallbackInfo<v8::Value>& args) {
265			BlobBindingData* binding_data =
266		2	Environment::GetBindingData<BlobBindingData>(args);
267
268		2	Environment* env = Environment::GetCurrent(args);
269	✗✓	4	CHECK(args[0]->IsString()); // ID key
270
271		2	Utf8Value key(env->isolate(), args[0]);
272
273		2	binding_data->revoke_data_object(std::string(*key, key.length()));
274		2	}
275
276		2	void Blob::GetDataObject(const v8::FunctionCallbackInfo<v8::Value>& args) {
277			BlobBindingData* binding_data =
278		2	Environment::GetBindingData<BlobBindingData>(args);
279
280		2	Environment* env = Environment::GetCurrent(args);
281	✗✓	4	CHECK(args[0]->IsString());
282
283		2	Utf8Value key(env->isolate(), args[0]);
284
285			BlobBindingData::StoredDataObject stored =
286		4	binding_data->get_data_object(std::string(*key, key.length()));
287	✓✓	2	if (stored.blob) {
288			Local<Value> type;
289		1	if (!String::NewFromUtf8(
290			env->isolate(),
291			stored.type.c_str(),
292			v8::NewStringType::kNormal,
293	✗✓	2	static_cast<int>(stored.type.length())).ToLocal(&type)) {
294			return;
295			}
296
297			Local<Value> values[] = {
298		1	stored.blob->object(),
299		1	Uint32::NewFromUnsigned(env->isolate(), stored.length),
300			type
301		3	};
302
303		2	args.GetReturnValue().Set(
304			Array::New(
305			env->isolate(),
306			values,
307			arraysize(values)));
308			}
309			}
310
311		50	FixedSizeBlobCopyJob::FixedSizeBlobCopyJob(
312			Environment* env,
313			Local<Object> object,
314			Blob* blob,
315		50	FixedSizeBlobCopyJob::Mode mode)
316			: AsyncWrap(env, object, AsyncWrap::PROVIDER_FIXEDSIZEBLOBCOPY),
317			ThreadPoolWork(env),
318		50	mode_(mode) {
319	✓✓	50	if (mode == FixedSizeBlobCopyJob::Mode::SYNC) MakeWeak();
320		50	source_ = blob->entries();
321		50	length_ = blob->length();
322		50	}
323
324		2	void FixedSizeBlobCopyJob::AfterThreadPoolWork(int status) {
325		2	Environment* env = AsyncWrap::env();
326	✗✓	2	CHECK_EQ(mode_, Mode::ASYNC);
327	✗✓✗✗	2	CHECK(status == 0 \|\| status == UV_ECANCELED);
328		4	std::unique_ptr<FixedSizeBlobCopyJob> ptr(this);
329		4	HandleScope handle_scope(env->isolate());
330		2	Context::Scope context_scope(env->context());
331	✓✓	6	Local<Value> args[2];
332
333	✗✓	2	if (status == UV_ECANCELED) {
334			args[0] = Number::New(env->isolate(), status),
335			args[1] = Undefined(env->isolate());
336			} else {
337		2	args[0] = Undefined(env->isolate());
338		4	args[1] = ArrayBuffer::New(env->isolate(), destination_);
339			}
340
341		2	ptr->MakeCallback(env->ondone_string(), arraysize(args), args);
342		2	}
343
344		50	void FixedSizeBlobCopyJob::DoThreadPoolWork() {
345		50	unsigned char* dest = static_cast<unsigned char*>(destination_->Data());
346	✓✓	50	if (length_ > 0) {
347		44	size_t total = 0;
348	✓✓	111	for (const auto& entry : source_) {
349		67	unsigned char* src = static_cast<unsigned char*>(entry.store->Data());
350		67	src += entry.offset;
351		67	memcpy(dest, src, entry.length);
352		67	dest += entry.length;
353		67	total += entry.length;
354	✗✓	67	CHECK_LE(total, length_);
355			}
356			}
357		50	}
358
359			void FixedSizeBlobCopyJob::MemoryInfo(MemoryTracker* tracker) const {
360			tracker->TrackFieldWithSize("source", length_);
361			tracker->TrackFieldWithSize(
362			"destination",
363			destination_ ? destination_->ByteLength() : 0);
364			}
365
366		775	void FixedSizeBlobCopyJob::Initialize(Environment* env, Local<Object> target) {
367		775	Isolate* isolate = env->isolate();
368		775	v8::Local<v8::FunctionTemplate> job = NewFunctionTemplate(isolate, New);
369		775	job->Inherit(AsyncWrap::GetConstructorTemplate(env));
370		1550	job->InstanceTemplate()->SetInternalFieldCount(
371			AsyncWrap::kInternalFieldCount);
372		775	SetProtoMethod(isolate, job, "run", Run);
373		775	SetConstructorFunction(env->context(), target, "FixedSizeBlobCopyJob", job);
374		775	}
375
376		50	void FixedSizeBlobCopyJob::New(const FunctionCallbackInfo<Value>& args) {
377			static constexpr size_t kMaxSyncLength = 4096;
378			static constexpr size_t kMaxEntryCount = 4;
379
380		50	Environment* env = Environment::GetCurrent(args);
381	✗✓	50	CHECK(args.IsConstructCall());
382	✗✓	50	CHECK(args[0]->IsObject());
383	✗✓	50	CHECK(Blob::HasInstance(env, args[0]));
384
385			Blob* blob;
386	✗✓	50	ASSIGN_OR_RETURN_UNWRAP(&blob, args[0]);
387
388			// This is a fairly arbitrary heuristic. We want to avoid deferring to
389			// the threadpool if the amount of data being copied is small and there
390			// aren't that many entries to copy.
391			FixedSizeBlobCopyJob::Mode mode =
392	✓✓	49	(blob->length() < kMaxSyncLength &&
393	✓✓	149	blob->entries().size() < kMaxEntryCount) ?
394			FixedSizeBlobCopyJob::Mode::SYNC :
395	✓✓	50	FixedSizeBlobCopyJob::Mode::ASYNC;
396
397		50	new FixedSizeBlobCopyJob(env, args.This(), blob, mode);
398			}
399
400		50	void FixedSizeBlobCopyJob::Run(const FunctionCallbackInfo<Value>& args) {
401		50	Environment* env = Environment::GetCurrent(args);
402			FixedSizeBlobCopyJob* job;
403	✗✓	52	ASSIGN_OR_RETURN_UNWRAP(&job, args.Holder());
404		50	job->destination_ =
405		50	ArrayBuffer::NewBackingStore(env->isolate(), job->length_);
406	✓✓	50	if (job->mode() == FixedSizeBlobCopyJob::Mode::ASYNC)
407		2	return job->ScheduleWork();
408
409		48	job->DoThreadPoolWork();
410		96	args.GetReturnValue().Set(
411		48	ArrayBuffer::New(env->isolate(), job->destination_));
412			}
413
414		5378	void FixedSizeBlobCopyJob::RegisterExternalReferences(
415			ExternalReferenceRegistry* registry) {
416		5378	registry->Register(New);
417		5378	registry->Register(Run);
418		5378	}
419
420			void BlobBindingData::StoredDataObject::MemoryInfo(
421			MemoryTracker* tracker) const {
422			tracker->TrackField("blob", blob);
423			tracker->TrackFieldWithSize("type", type.length());
424			}
425
426		2	BlobBindingData::StoredDataObject::StoredDataObject(
427			const BaseObjectPtr<Blob>& blob_,
428			size_t length_,
429		2	const std::string& type_)
430			: blob(blob_),
431			length(length_),
432		2	type(type_) {}
433
434		6146	BlobBindingData::BlobBindingData(Environment* env, Local<Object> wrap)
435		6146	: SnapshotableObject(env, wrap, type_int) {
436		6146	MakeWeak();
437		6146	}
438
439		24	void BlobBindingData::MemoryInfo(MemoryTracker* tracker) const {
440		24	tracker->TrackField("data_objects", data_objects_);
441		24	}
442
443		2	void BlobBindingData::store_data_object(
444			const std::string& uuid,
445			const BlobBindingData::StoredDataObject& object) {
446		2	data_objects_[uuid] = object;
447		2	}
448
449		2	void BlobBindingData::revoke_data_object(const std::string& uuid) {
450	✓✓	2	if (data_objects_.find(uuid) == data_objects_.end()) {
451		1	return;
452			}
453		1	data_objects_.erase(uuid);
454	✗✓	1	CHECK_EQ(data_objects_.find(uuid), data_objects_.end());
455			}
456
457		2	BlobBindingData::StoredDataObject BlobBindingData::get_data_object(
458			const std::string& uuid) {
459		2	auto entry = data_objects_.find(uuid);
460	✓✓	2	if (entry == data_objects_.end())
461		1	return BlobBindingData::StoredDataObject {};
462		1	return entry->second;
463			}
464
465		5371	void BlobBindingData::Deserialize(Local<Context> context,
466			Local<Object> holder,
467			int index,
468			InternalFieldInfoBase* info) {
469			DCHECK_EQ(index, BaseObject::kEmbedderType);
470		10742	HandleScope scope(context->GetIsolate());
471		5371	Environment* env = Environment::GetCurrent(context);
472			BlobBindingData* binding =
473		5371	env->AddBindingData<BlobBindingData>(context, holder);
474	✗✓	5371	CHECK_NOT_NULL(binding);
475		5371	}
476
477		6	bool BlobBindingData::PrepareForSerialization(Local<Context> context,
478			v8::SnapshotCreator* creator) {
479			// Stored blob objects are not actually persisted.
480			// Return true because we need to maintain the reference to the binding from
481			// JS land.
482		6	return true;
483			}
484
485		6	InternalFieldInfoBase* BlobBindingData::Serialize(int index) {
486			DCHECK_EQ(index, BaseObject::kEmbedderType);
487			InternalFieldInfo* info =
488		6	InternalFieldInfoBase::New<InternalFieldInfo>(type());
489		6	return info;
490			}
491
492		5378	void Blob::RegisterExternalReferences(ExternalReferenceRegistry* registry) {
493		5378	registry->Register(Blob::New);
494		5378	registry->Register(Blob::ToArrayBuffer);
495		5378	registry->Register(Blob::ToSlice);
496		5378	registry->Register(Blob::StoreDataObject);
497		5378	registry->Register(Blob::GetDataObject);
498		5378	registry->Register(Blob::RevokeDataObject);
499
500		5378	FixedSizeBlobCopyJob::RegisterExternalReferences(registry);
501		5378	}
502
503			} // namespace node
504
505		5450	NODE_MODULE_CONTEXT_AWARE_INTERNAL(blob, node::Blob::Initialize)
506		5378	NODE_MODULE_EXTERNAL_REFERENCE(blob, node::Blob::RegisterExternalReferences)