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1281 lines (1004 loc) · 38.8 KB
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#include "node.h"
#include "node_buffer.h"
#include "env.h"
#include "env-inl.h"
#include "string_bytes.h"
#include "string_search.h"
#include "util.h"
#include "util-inl.h"
#include "v8-profiler.h"
#include "v8.h"
#include <string.h>
#include <limits.h>
#define BUFFER_ID 0xB0E4
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define CHECK_NOT_OOB(r) \
do { \
if (!(r)) return env->ThrowRangeError("out of range index"); \
} while (0)
#define THROW_AND_RETURN_UNLESS_BUFFER(env, obj) \
do { \
if (!HasInstance(obj)) \
return env->ThrowTypeError("argument should be a Buffer"); \
} while (0)
#define SPREAD_ARG(val, name) \
CHECK((val)->IsUint8Array()); \
Local<Uint8Array> name = (val).As<Uint8Array>(); \
ArrayBuffer::Contents name##_c = name->Buffer()->GetContents(); \
const size_t name##_offset = name->ByteOffset(); \
const size_t name##_length = name->ByteLength(); \
char* const name##_data = \
static_cast<char*>(name##_c.Data()) + name##_offset; \
if (name##_length > 0) \
CHECK_NE(name##_data, nullptr);
#define SLICE_START_END(start_arg, end_arg, end_max) \
size_t start; \
size_t end; \
CHECK_NOT_OOB(ParseArrayIndex(start_arg, 0, &start)); \
CHECK_NOT_OOB(ParseArrayIndex(end_arg, end_max, &end)); \
if (end < start) end = start; \
CHECK_NOT_OOB(end <= end_max); \
size_t length = end - start;
#define BUFFER_MALLOC(length) \
zero_fill_all_buffers ? calloc(length, 1) : malloc(length)
#define SWAP_BYTES(arr, a, b) \
do { \
const uint8_t lo = arr[a]; \
arr[a] = arr[b]; \
arr[b] = lo; \
} while (0)
namespace node {
// if true, all Buffer and SlowBuffer instances will automatically zero-fill
bool zero_fill_all_buffers = false;
namespace Buffer {
using v8::ArrayBuffer;
using v8::ArrayBufferCreationMode;
using v8::Context;
using v8::EscapableHandleScope;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::HandleScope;
using v8::Integer;
using v8::Isolate;
using v8::Local;
using v8::Maybe;
using v8::MaybeLocal;
using v8::Number;
using v8::Object;
using v8::Persistent;
using v8::String;
using v8::Uint32;
using v8::Uint32Array;
using v8::Uint8Array;
using v8::Value;
using v8::WeakCallbackInfo;
class CallbackInfo {
public:
static inline void Free(char* data, void* hint);
static inline CallbackInfo* New(Isolate* isolate,
Local<ArrayBuffer> object,
FreeCallback callback,
char* data,
void* hint = 0);
private:
static void WeakCallback(const WeakCallbackInfo<CallbackInfo>&);
inline void WeakCallback(Isolate* isolate);
inline CallbackInfo(Isolate* isolate,
Local<ArrayBuffer> object,
FreeCallback callback,
char* data,
void* hint);
~CallbackInfo();
Persistent<ArrayBuffer> persistent_;
FreeCallback const callback_;
char* const data_;
void* const hint_;
DISALLOW_COPY_AND_ASSIGN(CallbackInfo);
};
void CallbackInfo::Free(char* data, void*) {
::free(data);
}
CallbackInfo* CallbackInfo::New(Isolate* isolate,
Local<ArrayBuffer> object,
FreeCallback callback,
char* data,
void* hint) {
return new CallbackInfo(isolate, object, callback, data, hint);
}
CallbackInfo::CallbackInfo(Isolate* isolate,
Local<ArrayBuffer> object,
FreeCallback callback,
char* data,
void* hint)
: persistent_(isolate, object),
callback_(callback),
data_(data),
hint_(hint) {
ArrayBuffer::Contents obj_c = object->GetContents();
CHECK_EQ(data_, static_cast<char*>(obj_c.Data()));
if (object->ByteLength() != 0)
CHECK_NE(data_, nullptr);
persistent_.SetWeak(this, WeakCallback, v8::WeakCallbackType::kParameter);
persistent_.SetWrapperClassId(BUFFER_ID);
persistent_.MarkIndependent();
isolate->AdjustAmountOfExternalAllocatedMemory(sizeof(*this));
}
CallbackInfo::~CallbackInfo() {
persistent_.Reset();
}
void CallbackInfo::WeakCallback(
const WeakCallbackInfo<CallbackInfo>& data) {
CallbackInfo* self = data.GetParameter();
self->WeakCallback(data.GetIsolate());
delete self;
}
void CallbackInfo::WeakCallback(Isolate* isolate) {
callback_(data_, hint_);
int64_t change_in_bytes = -static_cast<int64_t>(sizeof(*this));
isolate->AdjustAmountOfExternalAllocatedMemory(change_in_bytes);
}
// Buffer methods
bool HasInstance(Local<Value> val) {
return val->IsUint8Array();
}
bool HasInstance(Local<Object> obj) {
return obj->IsUint8Array();
}
char* Data(Local<Value> val) {
CHECK(val->IsUint8Array());
Local<Uint8Array> ui = val.As<Uint8Array>();
ArrayBuffer::Contents ab_c = ui->Buffer()->GetContents();
return static_cast<char*>(ab_c.Data()) + ui->ByteOffset();
}
char* Data(Local<Object> obj) {
CHECK(obj->IsUint8Array());
Local<Uint8Array> ui = obj.As<Uint8Array>();
ArrayBuffer::Contents ab_c = ui->Buffer()->GetContents();
return static_cast<char*>(ab_c.Data()) + ui->ByteOffset();
}
size_t Length(Local<Value> val) {
CHECK(val->IsUint8Array());
Local<Uint8Array> ui = val.As<Uint8Array>();
return ui->ByteLength();
}
size_t Length(Local<Object> obj) {
CHECK(obj->IsUint8Array());
Local<Uint8Array> ui = obj.As<Uint8Array>();
return ui->ByteLength();
}
MaybeLocal<Object> New(Isolate* isolate,
Local<String> string,
enum encoding enc) {
EscapableHandleScope scope(isolate);
const size_t length = StringBytes::Size(isolate, string, enc);
size_t actual = 0;
char* data = nullptr;
// malloc(0) and realloc(ptr, 0) have implementation-defined behavior in
// that the standard allows them to either return a unique pointer or a
// nullptr for zero-sized allocation requests. Normalize by always using
// a nullptr.
if (length > 0) {
data = static_cast<char*>(BUFFER_MALLOC(length));
if (data == nullptr)
return Local<Object>();
actual = StringBytes::Write(isolate, data, length, string, enc);
CHECK(actual <= length);
if (actual == 0) {
free(data);
data = nullptr;
} else if (actual < length) {
data = static_cast<char*>(realloc(data, actual));
CHECK_NE(data, nullptr);
}
}
Local<Object> buf;
if (New(isolate, data, actual).ToLocal(&buf))
return scope.Escape(buf);
// Object failed to be created. Clean up resources.
free(data);
return Local<Object>();
}
MaybeLocal<Object> New(Isolate* isolate, size_t length) {
EscapableHandleScope handle_scope(isolate);
Local<Object> obj;
if (Buffer::New(Environment::GetCurrent(isolate), length).ToLocal(&obj))
return handle_scope.Escape(obj);
return Local<Object>();
}
MaybeLocal<Object> New(Environment* env, size_t length) {
EscapableHandleScope scope(env->isolate());
// V8 currently only allows a maximum Typed Array index of max Smi.
if (length > kMaxLength) {
return Local<Object>();
}
void* data;
if (length > 0) {
data = BUFFER_MALLOC(length);
if (data == nullptr)
return Local<Object>();
} else {
data = nullptr;
}
Local<ArrayBuffer> ab =
ArrayBuffer::New(env->isolate(),
data,
length,
ArrayBufferCreationMode::kInternalized);
Local<Uint8Array> ui = Uint8Array::New(ab, 0, length);
Maybe<bool> mb =
ui->SetPrototype(env->context(), env->buffer_prototype_object());
if (mb.FromMaybe(false))
return scope.Escape(ui);
// Object failed to be created. Clean up resources.
free(data);
return Local<Object>();
}
MaybeLocal<Object> Copy(Isolate* isolate, const char* data, size_t length) {
Environment* env = Environment::GetCurrent(isolate);
EscapableHandleScope handle_scope(env->isolate());
Local<Object> obj;
if (Buffer::Copy(env, data, length).ToLocal(&obj))
return handle_scope.Escape(obj);
return Local<Object>();
}
MaybeLocal<Object> Copy(Environment* env, const char* data, size_t length) {
EscapableHandleScope scope(env->isolate());
// V8 currently only allows a maximum Typed Array index of max Smi.
if (length > kMaxLength) {
return Local<Object>();
}
void* new_data;
if (length > 0) {
CHECK_NE(data, nullptr);
new_data = malloc(length);
if (new_data == nullptr)
return Local<Object>();
memcpy(new_data, data, length);
} else {
new_data = nullptr;
}
Local<ArrayBuffer> ab =
ArrayBuffer::New(env->isolate(),
new_data,
length,
ArrayBufferCreationMode::kInternalized);
Local<Uint8Array> ui = Uint8Array::New(ab, 0, length);
Maybe<bool> mb =
ui->SetPrototype(env->context(), env->buffer_prototype_object());
if (mb.FromMaybe(false))
return scope.Escape(ui);
// Object failed to be created. Clean up resources.
free(new_data);
return Local<Object>();
}
MaybeLocal<Object> New(Isolate* isolate,
char* data,
size_t length,
FreeCallback callback,
void* hint) {
Environment* env = Environment::GetCurrent(isolate);
EscapableHandleScope handle_scope(env->isolate());
Local<Object> obj;
if (Buffer::New(env, data, length, callback, hint).ToLocal(&obj))
return handle_scope.Escape(obj);
return Local<Object>();
}
MaybeLocal<Object> New(Environment* env,
char* data,
size_t length,
FreeCallback callback,
void* hint) {
EscapableHandleScope scope(env->isolate());
if (length > kMaxLength) {
return Local<Object>();
}
Local<ArrayBuffer> ab = ArrayBuffer::New(env->isolate(), data, length);
// `Neuter()`ing is required here to prevent materialization of the backing
// store in v8. `nullptr` buffers are not writable, so this is semantically
// correct.
if (data == nullptr)
ab->Neuter();
Local<Uint8Array> ui = Uint8Array::New(ab, 0, length);
Maybe<bool> mb =
ui->SetPrototype(env->context(), env->buffer_prototype_object());
if (!mb.FromMaybe(false))
return Local<Object>();
CallbackInfo::New(env->isolate(), ab, callback, data, hint);
return scope.Escape(ui);
}
MaybeLocal<Object> New(Isolate* isolate, char* data, size_t length) {
Environment* env = Environment::GetCurrent(isolate);
EscapableHandleScope handle_scope(env->isolate());
Local<Object> obj;
if (Buffer::New(env, data, length).ToLocal(&obj))
return handle_scope.Escape(obj);
return Local<Object>();
}
MaybeLocal<Object> New(Environment* env, char* data, size_t length) {
EscapableHandleScope scope(env->isolate());
if (length > 0) {
CHECK_NE(data, nullptr);
CHECK(length <= kMaxLength);
}
Local<ArrayBuffer> ab =
ArrayBuffer::New(env->isolate(),
data,
length,
ArrayBufferCreationMode::kInternalized);
Local<Uint8Array> ui = Uint8Array::New(ab, 0, length);
Maybe<bool> mb =
ui->SetPrototype(env->context(), env->buffer_prototype_object());
if (mb.FromMaybe(false))
return scope.Escape(ui);
return Local<Object>();
}
void CreateFromString(const FunctionCallbackInfo<Value>& args) {
CHECK(args[0]->IsString());
CHECK(args[1]->IsString());
enum encoding enc = ParseEncoding(args.GetIsolate(),
args[1].As<String>(),
UTF8);
Local<Object> buf;
if (New(args.GetIsolate(), args[0].As<String>(), enc).ToLocal(&buf))
args.GetReturnValue().Set(buf);
}
void CreateFromArrayBuffer(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (!args[0]->IsArrayBuffer())
return env->ThrowTypeError("argument is not an ArrayBuffer");
Local<ArrayBuffer> ab = args[0].As<ArrayBuffer>();
size_t ab_length = ab->ByteLength();
size_t offset;
size_t max_length;
CHECK_NOT_OOB(ParseArrayIndex(args[1], 0, &offset));
CHECK_NOT_OOB(ParseArrayIndex(args[2], ab_length - offset, &max_length));
if (offset >= ab_length)
return env->ThrowRangeError("'offset' is out of bounds");
if (max_length > ab_length - offset)
return env->ThrowRangeError("'length' is out of bounds");
Local<Uint8Array> ui = Uint8Array::New(ab, offset, max_length);
Maybe<bool> mb =
ui->SetPrototype(env->context(), env->buffer_prototype_object());
if (!mb.FromMaybe(false))
return env->ThrowError("Unable to set Object prototype");
args.GetReturnValue().Set(ui);
}
template <encoding encoding>
void StringSlice(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();
THROW_AND_RETURN_UNLESS_BUFFER(env, args.This());
SPREAD_ARG(args.This(), ts_obj);
if (ts_obj_length == 0)
return args.GetReturnValue().SetEmptyString();
SLICE_START_END(args[0], args[1], ts_obj_length)
args.GetReturnValue().Set(
StringBytes::Encode(isolate, ts_obj_data + start, length, encoding));
}
template <>
void StringSlice<UCS2>(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
THROW_AND_RETURN_UNLESS_BUFFER(env, args.This());
SPREAD_ARG(args.This(), ts_obj);
if (ts_obj_length == 0)
return args.GetReturnValue().SetEmptyString();
SLICE_START_END(args[0], args[1], ts_obj_length)
length /= 2;
const char* data = ts_obj_data + start;
const uint16_t* buf;
bool release = false;
// Node's "ucs2" encoding expects LE character data inside a Buffer, so we
// need to reorder on BE platforms. See http://nodejs.org/api/buffer.html
// regarding Node's "ucs2" encoding specification.
const bool aligned = (reinterpret_cast<uintptr_t>(data) % sizeof(*buf) == 0);
if (IsLittleEndian() && !aligned) {
// Make a copy to avoid unaligned accesses in v8::String::NewFromTwoByte().
// This applies ONLY to little endian platforms, as misalignment will be
// handled by a byte-swapping operation in StringBytes::Encode on
// big endian platforms.
uint16_t* copy = new uint16_t[length];
for (size_t i = 0, k = 0; i < length; i += 1, k += 2) {
// Assumes that the input is little endian.
const uint8_t lo = static_cast<uint8_t>(data[k + 0]);
const uint8_t hi = static_cast<uint8_t>(data[k + 1]);
copy[i] = lo | hi << 8;
}
buf = copy;
release = true;
} else {
buf = reinterpret_cast<const uint16_t*>(data);
}
args.GetReturnValue().Set(StringBytes::Encode(env->isolate(), buf, length));
if (release)
delete[] buf;
}
void BinarySlice(const FunctionCallbackInfo<Value>& args) {
StringSlice<BINARY>(args);
}
void AsciiSlice(const FunctionCallbackInfo<Value>& args) {
StringSlice<ASCII>(args);
}
void Utf8Slice(const FunctionCallbackInfo<Value>& args) {
StringSlice<UTF8>(args);
}
void Ucs2Slice(const FunctionCallbackInfo<Value>& args) {
StringSlice<UCS2>(args);
}
void HexSlice(const FunctionCallbackInfo<Value>& args) {
StringSlice<HEX>(args);
}
void Base64Slice(const FunctionCallbackInfo<Value>& args) {
StringSlice<BASE64>(args);
}
// bytesCopied = buffer.copy(target[, targetStart][, sourceStart][, sourceEnd]);
void Copy(const FunctionCallbackInfo<Value> &args) {
Environment* env = Environment::GetCurrent(args);
THROW_AND_RETURN_UNLESS_BUFFER(env, args.This());
THROW_AND_RETURN_UNLESS_BUFFER(env, args[0]);
Local<Object> target_obj = args[0].As<Object>();
SPREAD_ARG(args.This(), ts_obj);
SPREAD_ARG(target_obj, target);
size_t target_start;
size_t source_start;
size_t source_end;
CHECK_NOT_OOB(ParseArrayIndex(args[1], 0, &target_start));
CHECK_NOT_OOB(ParseArrayIndex(args[2], 0, &source_start));
CHECK_NOT_OOB(ParseArrayIndex(args[3], ts_obj_length, &source_end));
// Copy 0 bytes; we're done
if (target_start >= target_length || source_start >= source_end)
return args.GetReturnValue().Set(0);
if (source_start > ts_obj_length)
return env->ThrowRangeError("out of range index");
if (source_end - source_start > target_length - target_start)
source_end = source_start + target_length - target_start;
uint32_t to_copy = MIN(MIN(source_end - source_start,
target_length - target_start),
ts_obj_length - source_start);
memmove(target_data + target_start, ts_obj_data + source_start, to_copy);
args.GetReturnValue().Set(to_copy);
}
void Fill(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
THROW_AND_RETURN_UNLESS_BUFFER(env, args[0]);
SPREAD_ARG(args[0], ts_obj);
size_t start = args[2]->Uint32Value();
size_t end = args[3]->Uint32Value();
size_t fill_length = end - start;
Local<String> str_obj;
size_t str_length;
enum encoding enc;
CHECK(fill_length + start <= ts_obj_length);
// First check if Buffer has been passed.
if (Buffer::HasInstance(args[1])) {
SPREAD_ARG(args[1], fill_obj);
str_length = fill_obj_length;
memcpy(ts_obj_data + start, fill_obj_data, MIN(str_length, fill_length));
goto start_fill;
}
// Then coerce everything that's not a string.
if (!args[1]->IsString()) {
int value = args[1]->Uint32Value() & 255;
memset(ts_obj_data + start, value, fill_length);
return;
}
str_obj = args[1]->ToString(env->isolate());
enc = ParseEncoding(env->isolate(), args[4], UTF8);
str_length =
enc == UTF8 ? str_obj->Utf8Length() :
enc == UCS2 ? str_obj->Length() * sizeof(uint16_t) : str_obj->Length();
if (enc == HEX && str_length % 2 != 0)
return env->ThrowTypeError("Invalid hex string");
if (str_length == 0)
return;
// Can't use StringBytes::Write() in all cases. For example if attempting
// to write a two byte character into a one byte Buffer.
if (enc == UTF8) {
node::Utf8Value str(env->isolate(), args[1]);
memcpy(ts_obj_data + start, *str, MIN(str_length, fill_length));
} else if (enc == UCS2) {
node::TwoByteValue str(env->isolate(), args[1]);
memcpy(ts_obj_data + start, *str, MIN(str_length, fill_length));
} else {
// Write initial String to Buffer, then use that memory to copy remainder
// of string. Correct the string length for cases like HEX where less than
// the total string length is written.
str_length = StringBytes::Write(env->isolate(),
ts_obj_data + start,
fill_length,
str_obj,
enc,
nullptr);
// This check is also needed in case Write() returns that no bytes could
// be written.
// TODO(trevnorris): Should this throw? Because of the string length was
// greater than 0 but couldn't be written then the string was invalid.
if (str_length == 0)
return;
}
start_fill:
if (str_length >= fill_length)
return;
size_t in_there = str_length;
char* ptr = ts_obj_data + start + str_length;
while (in_there < fill_length - in_there) {
memcpy(ptr, ts_obj_data + start, in_there);
ptr += in_there;
in_there *= 2;
}
if (in_there < fill_length) {
memcpy(ptr, ts_obj_data + start, fill_length - in_there);
}
}
template <encoding encoding>
void StringWrite(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
THROW_AND_RETURN_UNLESS_BUFFER(env, args.This());
SPREAD_ARG(args.This(), ts_obj);
if (!args[0]->IsString())
return env->ThrowTypeError("Argument must be a string");
Local<String> str = args[0]->ToString(env->isolate());
if (encoding == HEX && str->Length() % 2 != 0)
return env->ThrowTypeError("Invalid hex string");
size_t offset;
size_t max_length;
CHECK_NOT_OOB(ParseArrayIndex(args[1], 0, &offset));
CHECK_NOT_OOB(ParseArrayIndex(args[2], ts_obj_length - offset, &max_length));
max_length = MIN(ts_obj_length - offset, max_length);
if (max_length == 0)
return args.GetReturnValue().Set(0);
if (offset >= ts_obj_length)
return env->ThrowRangeError("Offset is out of bounds");
uint32_t written = StringBytes::Write(env->isolate(),
ts_obj_data + offset,
max_length,
str,
encoding,
nullptr);
args.GetReturnValue().Set(written);
}
void Base64Write(const FunctionCallbackInfo<Value>& args) {
StringWrite<BASE64>(args);
}
void BinaryWrite(const FunctionCallbackInfo<Value>& args) {
StringWrite<BINARY>(args);
}
void Utf8Write(const FunctionCallbackInfo<Value>& args) {
StringWrite<UTF8>(args);
}
void Ucs2Write(const FunctionCallbackInfo<Value>& args) {
StringWrite<UCS2>(args);
}
void HexWrite(const FunctionCallbackInfo<Value>& args) {
StringWrite<HEX>(args);
}
void AsciiWrite(const FunctionCallbackInfo<Value>& args) {
StringWrite<ASCII>(args);
}
static inline void Swizzle(char* start, unsigned int len) {
char* end = start + len - 1;
while (start < end) {
char tmp = *start;
*start++ = *end;
*end-- = tmp;
}
}
template <typename T, enum Endianness endianness>
void ReadFloatGeneric(const FunctionCallbackInfo<Value>& args) {
THROW_AND_RETURN_UNLESS_BUFFER(Environment::GetCurrent(args), args[0]);
SPREAD_ARG(args[0], ts_obj);
uint32_t offset = args[1]->Uint32Value();
CHECK_LE(offset + sizeof(T), ts_obj_length);
union NoAlias {
T val;
char bytes[sizeof(T)];
};
union NoAlias na;
const char* ptr = static_cast<const char*>(ts_obj_data) + offset;
memcpy(na.bytes, ptr, sizeof(na.bytes));
if (endianness != GetEndianness())
Swizzle(na.bytes, sizeof(na.bytes));
args.GetReturnValue().Set(na.val);
}
void ReadFloatLE(const FunctionCallbackInfo<Value>& args) {
ReadFloatGeneric<float, kLittleEndian>(args);
}
void ReadFloatBE(const FunctionCallbackInfo<Value>& args) {
ReadFloatGeneric<float, kBigEndian>(args);
}
void ReadDoubleLE(const FunctionCallbackInfo<Value>& args) {
ReadFloatGeneric<double, kLittleEndian>(args);
}
void ReadDoubleBE(const FunctionCallbackInfo<Value>& args) {
ReadFloatGeneric<double, kBigEndian>(args);
}
template <typename T, enum Endianness endianness>
void WriteFloatGeneric(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
bool should_assert = args.Length() < 4;
if (should_assert) {
THROW_AND_RETURN_UNLESS_BUFFER(env, args[0]);
}
Local<Uint8Array> ts_obj = args[0].As<Uint8Array>();
ArrayBuffer::Contents ts_obj_c = ts_obj->Buffer()->GetContents();
const size_t ts_obj_offset = ts_obj->ByteOffset();
const size_t ts_obj_length = ts_obj->ByteLength();
char* const ts_obj_data =
static_cast<char*>(ts_obj_c.Data()) + ts_obj_offset;
if (ts_obj_length > 0)
CHECK_NE(ts_obj_data, nullptr);
T val = args[1]->NumberValue(env->context()).FromMaybe(0);
size_t offset = args[2]->IntegerValue(env->context()).FromMaybe(0);
size_t memcpy_num = sizeof(T);
if (should_assert) {
CHECK_NOT_OOB(offset + memcpy_num >= memcpy_num);
CHECK_NOT_OOB(offset + memcpy_num <= ts_obj_length);
}
if (offset + memcpy_num > ts_obj_length)
memcpy_num = ts_obj_length - offset;
union NoAlias {
T val;
char bytes[sizeof(T)];
};
union NoAlias na = { val };
char* ptr = static_cast<char*>(ts_obj_data) + offset;
if (endianness != GetEndianness())
Swizzle(na.bytes, sizeof(na.bytes));
memcpy(ptr, na.bytes, memcpy_num);
}
void WriteFloatLE(const FunctionCallbackInfo<Value>& args) {
WriteFloatGeneric<float, kLittleEndian>(args);
}
void WriteFloatBE(const FunctionCallbackInfo<Value>& args) {
WriteFloatGeneric<float, kBigEndian>(args);
}
void WriteDoubleLE(const FunctionCallbackInfo<Value>& args) {
WriteFloatGeneric<double, kLittleEndian>(args);
}
void WriteDoubleBE(const FunctionCallbackInfo<Value>& args) {
WriteFloatGeneric<double, kBigEndian>(args);
}
void ByteLengthUtf8(const FunctionCallbackInfo<Value> &args) {
CHECK(args[0]->IsString());
// Fast case: avoid StringBytes on UTF8 string. Jump to v8.
args.GetReturnValue().Set(args[0].As<String>()->Utf8Length());
}
// Normalize val to be an integer in the range of [1, -1] since
// implementations of memcmp() can vary by platform.
static int normalizeCompareVal(int val, size_t a_length, size_t b_length) {
if (val == 0) {
if (a_length > b_length)
return 1;
else if (a_length < b_length)
return -1;
} else {
if (val > 0)
return 1;
else
return -1;
}
return val;
}
void CompareOffset(const FunctionCallbackInfo<Value> &args) {
Environment* env = Environment::GetCurrent(args);
THROW_AND_RETURN_UNLESS_BUFFER(env, args[0]);
THROW_AND_RETURN_UNLESS_BUFFER(env, args[1]);
SPREAD_ARG(args[0], ts_obj);
SPREAD_ARG(args[1], target);
size_t target_start;
size_t source_start;
size_t source_end;
size_t target_end;
CHECK_NOT_OOB(ParseArrayIndex(args[2], 0, &target_start));
CHECK_NOT_OOB(ParseArrayIndex(args[3], 0, &source_start));
CHECK_NOT_OOB(ParseArrayIndex(args[4], target_length, &target_end));
CHECK_NOT_OOB(ParseArrayIndex(args[5], ts_obj_length, &source_end));
if (source_start > ts_obj_length)
return env->ThrowRangeError("out of range index");
if (target_start > target_length)
return env->ThrowRangeError("out of range index");
CHECK_LE(source_start, source_end);
CHECK_LE(target_start, target_end);
size_t to_cmp = MIN(MIN(source_end - source_start,
target_end - target_start),
ts_obj_length - source_start);
int val = normalizeCompareVal(to_cmp > 0 ?
memcmp(ts_obj_data + source_start,
target_data + target_start,
to_cmp) : 0,
source_end - source_start,
target_end - target_start);
args.GetReturnValue().Set(val);
}
void Compare(const FunctionCallbackInfo<Value> &args) {
Environment* env = Environment::GetCurrent(args);
THROW_AND_RETURN_UNLESS_BUFFER(env, args[0]);
THROW_AND_RETURN_UNLESS_BUFFER(env, args[1]);
SPREAD_ARG(args[0], obj_a);
SPREAD_ARG(args[1], obj_b);
size_t cmp_length = MIN(obj_a_length, obj_b_length);
int val = normalizeCompareVal(cmp_length > 0 ?
memcmp(obj_a_data, obj_b_data, cmp_length) : 0,
obj_a_length, obj_b_length);
args.GetReturnValue().Set(val);
}
// Computes the offset for starting an indexOf or lastIndexOf search.
// Returns either a valid offset in [0...<length - 1>], ie inside the Buffer,
// or -1 to signal that there is no possible match.
int64_t IndexOfOffset(size_t length, int64_t offset_i64, bool is_forward) {
int64_t length_i64 = static_cast<int64_t>(length);
if (length_i64 == 0) {
// Empty buffer, no match.
return -1;
}
if (offset_i64 < 0) {
if (offset_i64 + length_i64 >= 0) {
// Negative offsets count backwards from the end of the buffer.
return length_i64 + offset_i64;
} else if (is_forward) {
// indexOf from before the start of the buffer: search the whole buffer.
return 0;
} else {
// lastIndexOf from before the start of the buffer: no match.
return -1;
}
} else {
if (offset_i64 < length_i64) {
// Valid positive offset.
return offset_i64;
} else if (is_forward) {
// indexOf from past the end of the buffer: no match.
return -1;
} else {
// lastIndexOf from past the end of the buffer: search the whole buffer.
return length_i64 - 1;
}
}
}
void IndexOfString(const FunctionCallbackInfo<Value>& args) {
ASSERT(args[1]->IsString());
ASSERT(args[2]->IsNumber());
ASSERT(args[4]->IsBoolean());
enum encoding enc = ParseEncoding(args.GetIsolate(),
args[3],
UTF8);
THROW_AND_RETURN_UNLESS_BUFFER(Environment::GetCurrent(args), args[0]);
SPREAD_ARG(args[0], ts_obj);
Local<String> needle = args[1].As<String>();
int64_t offset_i64 = args[2]->IntegerValue();
bool is_forward = args[4]->IsTrue();
const char* haystack = ts_obj_data;
const size_t haystack_length = ts_obj_length;
// Extended latin-1 characters are 2 bytes in Utf8.
const size_t needle_length =
enc == BINARY ? needle->Length() : needle->Utf8Length();
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