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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	node_blob.cc	Lines:	238	277	85.9 %
Date:	2022-05-23 04:15:47	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::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;

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

Local<FunctionTemplate> Blob::GetConstructorTemplate(Environment* env) {
  Local<FunctionTemplate> tmpl = env->blob_constructor_template();
  if (tmpl.IsEmpty()) {
    tmpl = FunctionTemplate::New(env->isolate());
    tmpl->InstanceTemplate()->SetInternalFieldCount(
        BaseObject::kInternalFieldCount);
    tmpl->Inherit(BaseObject::GetConstructorTemplate(env));
    tmpl->SetClassName(
        FIXED_ONE_BYTE_STRING(env->isolate(), "Blob"));
    env->SetProtoMethod(tmpl, "toArrayBuffer", ToArrayBuffer);
    env->SetProtoMethod(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) {
  v8::Local<v8::FunctionTemplate> job = env->NewFunctionTemplate(New);
  job->Inherit(AsyncWrap::GetConstructorTemplate(env));
  job->InstanceTemplate()->SetInternalFieldCount(
      AsyncWrap::kInternalFieldCount);
  env->SetProtoMethod(job, "run", Run);
  env->SetConstructorFunction(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,
    InternalFieldInfo* info) {
  DCHECK_EQ(index, BaseObject::kSlot);
  HandleScope scope(context->GetIsolate());
  Environment* env = Environment::GetCurrent(context);
  BlobBindingData* binding =
      env->AddBindingData<BlobBindingData>(context, holder);
  CHECK_NOT_NULL(binding);
}

void BlobBindingData::PrepareForSerialization(
    Local<Context> context,
    v8::SnapshotCreator* creator) {
  // Stored blob objects are not actually persisted.
}

InternalFieldInfo* BlobBindingData::Serialize(int index) {
  DCHECK_EQ(index, BaseObject::kSlot);
  InternalFieldInfo* info = InternalFieldInfo::New(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::Local;
26			using v8::MaybeLocal;
27			using v8::Number;
28			using v8::Object;
29			using v8::String;
30			using v8::Uint32;
31			using v8::Undefined;
32			using v8::Value;
33
34		847	void Blob::Initialize(
35			Local<Object> target,
36			Local<Value> unused,
37			Local<Context> context,
38			void* priv) {
39		847	Environment* env = Environment::GetCurrent(context);
40
41			BlobBindingData* const binding_data =
42		847	env->AddBindingData<BlobBindingData>(context, target);
43	✗✓	847	if (binding_data == nullptr) return;
44
45		847	env->SetMethod(target, "createBlob", New);
46		847	env->SetMethod(target, "storeDataObject", StoreDataObject);
47		847	env->SetMethod(target, "getDataObject", GetDataObject);
48		847	env->SetMethod(target, "revokeDataObject", RevokeDataObject);
49		847	FixedSizeBlobCopyJob::Initialize(env, target);
50			}
51
52		273	Local<FunctionTemplate> Blob::GetConstructorTemplate(Environment* env) {
53		273	Local<FunctionTemplate> tmpl = env->blob_constructor_template();
54	✓✓	273	if (tmpl.IsEmpty()) {
55		14	tmpl = FunctionTemplate::New(env->isolate());
56		28	tmpl->InstanceTemplate()->SetInternalFieldCount(
57			BaseObject::kInternalFieldCount);
58		14	tmpl->Inherit(BaseObject::GetConstructorTemplate(env));
59		14	tmpl->SetClassName(
60			FIXED_ONE_BYTE_STRING(env->isolate(), "Blob"));
61		14	env->SetProtoMethod(tmpl, "toArrayBuffer", ToArrayBuffer);
62		14	env->SetProtoMethod(tmpl, "slice", ToSlice);
63		14	env->set_blob_constructor_template(tmpl);
64			}
65		273	return tmpl;
66			}
67
68		128	bool Blob::HasInstance(Environment* env, v8::Local<v8::Value> object) {
69		256	return GetConstructorTemplate(env)->HasInstance(object);
70			}
71
72		145	BaseObjectPtr<Blob> Blob::Create(
73			Environment* env,
74			const std::vector<BlobEntry> store,
75			size_t length) {
76
77		290	HandleScope scope(env->isolate());
78
79			Local<Function> ctor;
80	✗✓	435	if (!GetConstructorTemplate(env)->GetFunction(env->context()).ToLocal(&ctor))
81			return BaseObjectPtr<Blob>();
82
83			Local<Object> obj;
84	✗✓	290	if (!ctor->NewInstance(env->context()).ToLocal(&obj))
85			return BaseObjectPtr<Blob>();
86
87		145	return MakeBaseObject<Blob>(env, obj, store, length);
88			}
89
90		131	void Blob::New(const FunctionCallbackInfo<Value>& args) {
91		131	Environment* env = Environment::GetCurrent(args);
92	✗✓	131	CHECK(args[0]->IsArray()); // sources
93	✗✓	131	CHECK(args[1]->IsUint32()); // length
94
95		131	std::vector<BlobEntry> entries;
96
97		262	size_t length = args[1].As<Uint32>()->Value();
98	✓✗	131	size_t len = 0;
99		131	Local<Array> ary = args[0].As<Array>();
100	✓✓	558	for (size_t n = 0; n < ary->Length(); n++) {
101			Local<Value> entry;
102	✗✓	296	if (!ary->Get(env->context(), n).ToLocal(&entry))
103			return;
104	✓✓✗✓ ✗✓	148	CHECK(entry->IsArrayBufferView() \|\| Blob::HasInstance(env, entry));
105	✓✓	148	if (entry->IsArrayBufferView()) {
106		147	Local<ArrayBufferView> view = entry.As<ArrayBufferView>();
107	✗✓	147	CHECK_EQ(view->ByteOffset(), 0);
108		294	std::shared_ptr<BackingStore> store = view->Buffer()->GetBackingStore();
109		147	size_t byte_length = view->ByteLength();
110		294	view->Buffer()->Detach(); // The Blob will own the backing store now.
111		147	entries.emplace_back(BlobEntry{std::move(store), byte_length, 0});
112		147	len += byte_length;
113			} else {
114			Blob* blob;
115	✗✓	1	ASSIGN_OR_RETURN_UNWRAP(&blob, entry);
116		1	auto source = blob->entries();
117		1	entries.insert(entries.end(), source.begin(), source.end());
118		1	len += blob->length();
119			}
120			}
121	✗✓	131	CHECK_EQ(length, len);
122
123		262	BaseObjectPtr<Blob> blob = Create(env, entries, length);
124	✓✗	131	if (blob)
125		262	args.GetReturnValue().Set(blob->object());
126			}
127
128			void Blob::ToArrayBuffer(const FunctionCallbackInfo<Value>& args) {
129			Environment* env = Environment::GetCurrent(args);
130			Blob* blob;
131			ASSIGN_OR_RETURN_UNWRAP(&blob, args.Holder());
132			Local<Value> ret;
133			if (blob->GetArrayBuffer(env).ToLocal(&ret))
134			args.GetReturnValue().Set(ret);
135			}
136
137		13	void Blob::ToSlice(const FunctionCallbackInfo<Value>& args) {
138		13	Environment* env = Environment::GetCurrent(args);
139			Blob* blob;
140	✗✓	13	ASSIGN_OR_RETURN_UNWRAP(&blob, args.Holder());
141	✗✓	13	CHECK(args[0]->IsUint32());
142	✗✓	13	CHECK(args[1]->IsUint32());
143	✓✗	26	size_t start = args[0].As<Uint32>()->Value();
144		26	size_t end = args[1].As<Uint32>()->Value();
145		26	BaseObjectPtr<Blob> slice = blob->Slice(env, start, end);
146	✓✗	13	if (slice)
147		26	args.GetReturnValue().Set(slice->object());
148			}
149
150			void Blob::MemoryInfo(MemoryTracker* tracker) const {
151			tracker->TrackFieldWithSize("store", length_);
152			}
153
154			MaybeLocal<Value> Blob::GetArrayBuffer(Environment* env) {
155			EscapableHandleScope scope(env->isolate());
156			size_t len = length();
157			std::shared_ptr<BackingStore> store =
158			ArrayBuffer::NewBackingStore(env->isolate(), len);
159			if (len > 0) {
160			unsigned char* dest = static_cast<unsigned char*>(store->Data());
161			size_t total = 0;
162			for (const auto& entry : entries()) {
163			unsigned char* src = static_cast<unsigned char*>(entry.store->Data());
164			src += entry.offset;
165			memcpy(dest, src, entry.length);
166			dest += entry.length;
167			total += entry.length;
168			CHECK_LE(total, len);
169			}
170			}
171
172			return scope.Escape(ArrayBuffer::New(env->isolate(), store));
173			}
174
175		13	BaseObjectPtr<Blob> Blob::Slice(Environment* env, size_t start, size_t end) {
176	✗✓	13	CHECK_LE(start, length());
177	✗✓	13	CHECK_LE(end, length());
178	✗✓	13	CHECK_LE(start, end);
179
180		26	std::vector<BlobEntry> slices;
181		13	size_t total = end - start;
182		13	size_t remaining = total;
183
184	✓✓	13	if (total == 0) return Create(env, slices, 0);
185
186	✓✗	23	for (const auto& entry : entries()) {
187	✗✓	14	if (start + entry.offset > entry.store->ByteLength()) {
188			start -= entry.length;
189			continue;
190			}
191
192		14	size_t offset = entry.offset + start;
193		14	size_t len = std::min(remaining, entry.store->ByteLength() - offset);
194		14	slices.emplace_back(BlobEntry{entry.store, len, offset});
195
196		14	remaining -= len;
197		14	start = 0;
198
199	✓✓	14	if (remaining == 0)
200		9	break;
201			}
202
203		9	return Create(env, slices, total);
204			}
205
206		145	Blob::Blob(
207			Environment* env,
208			v8::Local<v8::Object> obj,
209			const std::vector<BlobEntry>& store,
210		145	size_t length)
211			: BaseObject(env, obj),
212			store_(store),
213		145	length_(length) {
214		145	MakeWeak();
215		145	}
216
217			BaseObjectPtr<BaseObject>
218		1	Blob::BlobTransferData::Deserialize(
219			Environment* env,
220			Local<Context> context,
221			std::unique_ptr<worker::TransferData> self) {
222	✗✓	2	if (context != env->context()) {
223			THROW_ERR_MESSAGE_TARGET_CONTEXT_UNAVAILABLE(env);
224			return {};
225			}
226		1	return Blob::Create(env, store_, length_);
227			}
228
229		1	BaseObject::TransferMode Blob::GetTransferMode() const {
230		1	return BaseObject::TransferMode::kCloneable;
231			}
232
233		1	std::unique_ptr<worker::TransferData> Blob::CloneForMessaging() const {
234		1	return std::make_unique<BlobTransferData>(store_, length_);
235			}
236
237		2	void Blob::StoreDataObject(const v8::FunctionCallbackInfo<v8::Value>& args) {
238		2	Environment* env = Environment::GetCurrent(args);
239			BlobBindingData* binding_data =
240		2	Environment::GetBindingData<BlobBindingData>(args);
241
242	✗✓	4	CHECK(args[0]->IsString()); // ID key
243	✗✓	2	CHECK(Blob::HasInstance(env, args[1])); // Blob
244	✗✓	2	CHECK(args[2]->IsUint32()); // Length
245	✗✓	4	CHECK(args[3]->IsString()); // Type
246
247		2	Utf8Value key(env->isolate(), args[0]);
248			Blob* blob;
249	✗✓	2	ASSIGN_OR_RETURN_UNWRAP(&blob, args[1]);
250
251	✓✗	4	size_t length = args[2].As<Uint32>()->Value();
252		2	Utf8Value type(env->isolate(), args[3]);
253
254		2	binding_data->store_data_object(
255		4	std::string(*key, key.length()),
256		4	BlobBindingData::StoredDataObject(
257		4	BaseObjectPtr<Blob>(blob),
258			length,
259		4	std::string(*type, type.length())));
260			}
261
262		2	void Blob::RevokeDataObject(const v8::FunctionCallbackInfo<v8::Value>& args) {
263			BlobBindingData* binding_data =
264		2	Environment::GetBindingData<BlobBindingData>(args);
265
266		2	Environment* env = Environment::GetCurrent(args);
267	✗✓	4	CHECK(args[0]->IsString()); // ID key
268
269		2	Utf8Value key(env->isolate(), args[0]);
270
271		2	binding_data->revoke_data_object(std::string(*key, key.length()));
272		2	}
273
274		2	void Blob::GetDataObject(const v8::FunctionCallbackInfo<v8::Value>& args) {
275			BlobBindingData* binding_data =
276		2	Environment::GetBindingData<BlobBindingData>(args);
277
278		2	Environment* env = Environment::GetCurrent(args);
279	✗✓	4	CHECK(args[0]->IsString());
280
281		2	Utf8Value key(env->isolate(), args[0]);
282
283			BlobBindingData::StoredDataObject stored =
284		4	binding_data->get_data_object(std::string(*key, key.length()));
285	✓✓	2	if (stored.blob) {
286			Local<Value> type;
287		1	if (!String::NewFromUtf8(
288			env->isolate(),
289			stored.type.c_str(),
290			v8::NewStringType::kNormal,
291	✗✓	2	static_cast<int>(stored.type.length())).ToLocal(&type)) {
292			return;
293			}
294
295			Local<Value> values[] = {
296		1	stored.blob->object(),
297		1	Uint32::NewFromUnsigned(env->isolate(), stored.length),
298			type
299		3	};
300
301		2	args.GetReturnValue().Set(
302			Array::New(
303			env->isolate(),
304			values,
305			arraysize(values)));
306			}
307			}
308
309		125	FixedSizeBlobCopyJob::FixedSizeBlobCopyJob(
310			Environment* env,
311			Local<Object> object,
312			Blob* blob,
313		125	FixedSizeBlobCopyJob::Mode mode)
314			: AsyncWrap(env, object, AsyncWrap::PROVIDER_FIXEDSIZEBLOBCOPY),
315			ThreadPoolWork(env),
316		125	mode_(mode) {
317	✓✓	125	if (mode == FixedSizeBlobCopyJob::Mode::SYNC) MakeWeak();
318		125	source_ = blob->entries();
319		125	length_ = blob->length();
320		125	}
321
322		2	void FixedSizeBlobCopyJob::AfterThreadPoolWork(int status) {
323		2	Environment* env = AsyncWrap::env();
324	✗✓	2	CHECK_EQ(mode_, Mode::ASYNC);
325	✗✓✗✗	2	CHECK(status == 0 \|\| status == UV_ECANCELED);
326		4	std::unique_ptr<FixedSizeBlobCopyJob> ptr(this);
327		4	HandleScope handle_scope(env->isolate());
328		2	Context::Scope context_scope(env->context());
329	✓✓	6	Local<Value> args[2];
330
331	✗✓	2	if (status == UV_ECANCELED) {
332			args[0] = Number::New(env->isolate(), status),
333			args[1] = Undefined(env->isolate());
334			} else {
335		2	args[0] = Undefined(env->isolate());
336		4	args[1] = ArrayBuffer::New(env->isolate(), destination_);
337			}
338
339		2	ptr->MakeCallback(env->ondone_string(), arraysize(args), args);
340		2	}
341
342		125	void FixedSizeBlobCopyJob::DoThreadPoolWork() {
343		125	unsigned char* dest = static_cast<unsigned char*>(destination_->Data());
344	✓✓	125	if (length_ > 0) {
345		117	size_t total = 0;
346	✓✓	257	for (const auto& entry : source_) {
347		140	unsigned char* src = static_cast<unsigned char*>(entry.store->Data());
348		140	src += entry.offset;
349		140	memcpy(dest, src, entry.length);
350		140	dest += entry.length;
351		140	total += entry.length;
352	✗✓	140	CHECK_LE(total, length_);
353			}
354			}
355		125	}
356
357			void FixedSizeBlobCopyJob::MemoryInfo(MemoryTracker* tracker) const {
358			tracker->TrackFieldWithSize("source", length_);
359			tracker->TrackFieldWithSize(
360			"destination",
361			destination_ ? destination_->ByteLength() : 0);
362			}
363
364		847	void FixedSizeBlobCopyJob::Initialize(Environment* env, Local<Object> target) {
365		847	v8::Local<v8::FunctionTemplate> job = env->NewFunctionTemplate(New);
366		847	job->Inherit(AsyncWrap::GetConstructorTemplate(env));
367		1694	job->InstanceTemplate()->SetInternalFieldCount(
368			AsyncWrap::kInternalFieldCount);
369		847	env->SetProtoMethod(job, "run", Run);
370		847	env->SetConstructorFunction(target, "FixedSizeBlobCopyJob", job);
371		847	}
372
373		125	void FixedSizeBlobCopyJob::New(const FunctionCallbackInfo<Value>& args) {
374			static constexpr size_t kMaxSyncLength = 4096;
375			static constexpr size_t kMaxEntryCount = 4;
376
377		125	Environment* env = Environment::GetCurrent(args);
378	✗✓	125	CHECK(args.IsConstructCall());
379	✗✓	125	CHECK(args[0]->IsObject());
380	✗✓	125	CHECK(Blob::HasInstance(env, args[0]));
381
382			Blob* blob;
383	✗✓	125	ASSIGN_OR_RETURN_UNWRAP(&blob, args[0]);
384
385			// This is a fairly arbitrary heuristic. We want to avoid deferring to
386			// the threadpool if the amount of data being copied is small and there
387			// aren't that many entries to copy.
388			FixedSizeBlobCopyJob::Mode mode =
389	✓✓	124	(blob->length() < kMaxSyncLength &&
390	✓✓	374	blob->entries().size() < kMaxEntryCount) ?
391			FixedSizeBlobCopyJob::Mode::SYNC :
392	✓✓	125	FixedSizeBlobCopyJob::Mode::ASYNC;
393
394		125	new FixedSizeBlobCopyJob(env, args.This(), blob, mode);
395			}
396
397		125	void FixedSizeBlobCopyJob::Run(const FunctionCallbackInfo<Value>& args) {
398		125	Environment* env = Environment::GetCurrent(args);
399			FixedSizeBlobCopyJob* job;
400	✗✓	127	ASSIGN_OR_RETURN_UNWRAP(&job, args.Holder());
401		125	job->destination_ =
402		125	ArrayBuffer::NewBackingStore(env->isolate(), job->length_);
403	✓✓	125	if (job->mode() == FixedSizeBlobCopyJob::Mode::ASYNC)
404		2	return job->ScheduleWork();
405
406		123	job->DoThreadPoolWork();
407		246	args.GetReturnValue().Set(
408		123	ArrayBuffer::New(env->isolate(), job->destination_));
409			}
410
411		5187	void FixedSizeBlobCopyJob::RegisterExternalReferences(
412			ExternalReferenceRegistry* registry) {
413		5187	registry->Register(New);
414		5187	registry->Register(Run);
415		5187	}
416
417			void BlobBindingData::StoredDataObject::MemoryInfo(
418			MemoryTracker* tracker) const {
419			tracker->TrackField("blob", blob);
420			tracker->TrackFieldWithSize("type", type.length());
421			}
422
423		2	BlobBindingData::StoredDataObject::StoredDataObject(
424			const BaseObjectPtr<Blob>& blob_,
425			size_t length_,
426		2	const std::string& type_)
427			: blob(blob_),
428			length(length_),
429		2	type(type_) {}
430
431		6028	BlobBindingData::BlobBindingData(Environment* env, Local<Object> wrap)
432		6028	: SnapshotableObject(env, wrap, type_int) {
433		6028	MakeWeak();
434		6028	}
435
436		24	void BlobBindingData::MemoryInfo(MemoryTracker* tracker) const {
437		24	tracker->TrackField("data_objects", data_objects_);
438		24	}
439
440		2	void BlobBindingData::store_data_object(
441			const std::string& uuid,
442			const BlobBindingData::StoredDataObject& object) {
443		2	data_objects_[uuid] = object;
444		2	}
445
446		2	void BlobBindingData::revoke_data_object(const std::string& uuid) {
447	✓✓	2	if (data_objects_.find(uuid) == data_objects_.end()) {
448		1	return;
449			}
450		1	data_objects_.erase(uuid);
451	✗✓	1	CHECK_EQ(data_objects_.find(uuid), data_objects_.end());
452			}
453
454		2	BlobBindingData::StoredDataObject BlobBindingData::get_data_object(
455			const std::string& uuid) {
456		2	auto entry = data_objects_.find(uuid);
457	✓✓	2	if (entry == data_objects_.end())
458		1	return BlobBindingData::StoredDataObject {};
459		1	return entry->second;
460			}
461
462		5181	void BlobBindingData::Deserialize(
463			Local<Context> context,
464			Local<Object> holder,
465			int index,
466			InternalFieldInfo* info) {
467			DCHECK_EQ(index, BaseObject::kSlot);
468		10362	HandleScope scope(context->GetIsolate());
469		5181	Environment* env = Environment::GetCurrent(context);
470			BlobBindingData* binding =
471		5181	env->AddBindingData<BlobBindingData>(context, holder);
472	✗✓	5181	CHECK_NOT_NULL(binding);
473		5181	}
474
475		6	void BlobBindingData::PrepareForSerialization(
476			Local<Context> context,
477			v8::SnapshotCreator* creator) {
478			// Stored blob objects are not actually persisted.
479		6	}
480
481		6	InternalFieldInfo* BlobBindingData::Serialize(int index) {
482			DCHECK_EQ(index, BaseObject::kSlot);
483		6	InternalFieldInfo* info = InternalFieldInfo::New(type());
484		6	return info;
485			}
486
487		5187	void Blob::RegisterExternalReferences(ExternalReferenceRegistry* registry) {
488		5187	registry->Register(Blob::New);
489		5187	registry->Register(Blob::ToArrayBuffer);
490		5187	registry->Register(Blob::ToSlice);
491		5187	registry->Register(Blob::StoreDataObject);
492		5187	registry->Register(Blob::GetDataObject);
493		5187	registry->Register(Blob::RevokeDataObject);
494
495		5187	FixedSizeBlobCopyJob::RegisterExternalReferences(registry);
496		5187	}
497
498			} // namespace node
499
500		5255	NODE_MODULE_CONTEXT_AWARE_INTERNAL(blob, node::Blob::Initialize)
501		5187	NODE_MODULE_EXTERNAL_REFERENCE(blob, node::Blob::RegisterExternalReferences)