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659 lines (472 loc) · 18.5 KB
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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
#include "node.h"
#include "node_buffer.h"
#include "env.h"
#include "env-inl.h"
#include "smalloc.h"
#include "string_bytes.h"
#include "v8-profiler.h"
#include "v8.h"
#include <assert.h>
#include <string.h>
#include <limits.h>
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define CHECK_NOT_OOB(r) \
do { if (!(r)) return ThrowRangeError("out of range index"); } while (0)
#define ARGS_THIS(argT) \
Local<Object> obj = argT; \
size_t obj_length = obj->GetIndexedPropertiesExternalArrayDataLength(); \
char* obj_data = static_cast<char*>( \
obj->GetIndexedPropertiesExternalArrayData()); \
if (obj_length > 0) \
assert(obj_data != NULL);
#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;
namespace node {
namespace Buffer {
using v8::ArrayBuffer;
using v8::Context;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::Handle;
using v8::HandleScope;
using v8::Local;
using v8::Number;
using v8::Object;
using v8::String;
using v8::Uint32;
using v8::Value;
bool HasInstance(Handle<Value> val) {
return val->IsObject() && HasInstance(val.As<Object>());
}
bool HasInstance(Handle<Object> obj) {
if (!obj->HasIndexedPropertiesInExternalArrayData())
return false;
v8::ExternalArrayType type = obj->GetIndexedPropertiesExternalArrayDataType();
return type == v8::kExternalUnsignedByteArray;
}
char* Data(Handle<Value> val) {
assert(val->IsObject());
// Use a fully qualified name here to work around a bug in gcc 4.2.
// It mistakes an unadorned call to Data() for the v8::String::Data type.
return node::Buffer::Data(val.As<Object>());
}
char* Data(Handle<Object> obj) {
assert(obj->HasIndexedPropertiesInExternalArrayData());
return static_cast<char*>(obj->GetIndexedPropertiesExternalArrayData());
}
size_t Length(Handle<Value> val) {
assert(val->IsObject());
return Length(val.As<Object>());
}
size_t Length(Handle<Object> obj) {
assert(obj->HasIndexedPropertiesInExternalArrayData());
return obj->GetIndexedPropertiesExternalArrayDataLength();
}
Local<Object> New(Handle<String> string, enum encoding enc) {
HandleScope scope(node_isolate);
size_t length = StringBytes::Size(string, enc);
Local<Object> buf = New(length);
char* data = Buffer::Data(buf);
StringBytes::Write(data, length, string, enc);
return scope.Close(buf);
}
Local<Object> New(size_t length) {
Environment* env = Environment::GetCurrent(node_isolate);
return Buffer::New(env, length);
}
// TODO(trevnorris): these have a flaw by needing to call the Buffer inst then
// Alloc. continue to look for a better architecture.
Local<Object> New(Environment* env, size_t length) {
HandleScope scope(node_isolate);
assert(length <= kMaxLength);
Local<Value> arg = Uint32::NewFromUnsigned(length, node_isolate);
Local<Object> obj = env->buffer_constructor_function()->NewInstance(1, &arg);
// TODO(trevnorris): done like this to handle HasInstance since only checks
// if external array data has been set, but would like to use a better
// approach if v8 provided one.
char* data;
if (length > 0) {
data = static_cast<char*>(malloc(length));
if (data == NULL)
FatalError("node::Buffer::New(size_t)", "Out Of Memory");
} else {
data = NULL;
}
smalloc::Alloc(obj, data, length);
return scope.Close(obj);
}
Local<Object> New(const char* data, size_t length) {
Environment* env = Environment::GetCurrent(node_isolate);
return Buffer::New(env, data, length);
}
// TODO(trevnorris): for backwards compatibility this is left to copy the data,
// but for consistency w/ the other should use data. And a copy version renamed
// to something else.
Local<Object> New(Environment* env, const char* data, size_t length) {
HandleScope scope(node_isolate);
assert(length <= kMaxLength);
Local<Value> arg = Uint32::NewFromUnsigned(length, node_isolate);
Local<Object> obj = env->buffer_constructor_function()->NewInstance(1, &arg);
// TODO(trevnorris): done like this to handle HasInstance since only checks
// if external array data has been set, but would like to use a better
// approach if v8 provided one.
char* new_data;
if (length > 0) {
new_data = static_cast<char*>(malloc(length));
if (new_data == NULL)
FatalError("node::Buffer::New(const char*, size_t)", "Out Of Memory");
memcpy(new_data, data, length);
} else {
new_data = NULL;
}
smalloc::Alloc(obj, new_data, length);
return scope.Close(obj);
}
Local<Object> New(char* data,
size_t length,
smalloc::FreeCallback callback,
void* hint) {
Environment* env = Environment::GetCurrent(node_isolate);
return Buffer::New(env, data, length, callback, hint);
}
Local<Object> New(Environment* env,
char* data,
size_t length,
smalloc::FreeCallback callback,
void* hint) {
HandleScope scope(node_isolate);
assert(length <= kMaxLength);
Local<Value> arg = Uint32::NewFromUnsigned(length, node_isolate);
Local<Object> obj = env->buffer_constructor_function()->NewInstance(1, &arg);
smalloc::Alloc(obj, data, length, callback, hint);
return scope.Close(obj);
}
Local<Object> Use(char* data, uint32_t length) {
Environment* env = Environment::GetCurrent(node_isolate);
return Buffer::Use(env, data, length);
}
Local<Object> Use(Environment* env, char* data, uint32_t length) {
HandleScope scope(node_isolate);
assert(length <= kMaxLength);
Local<Value> arg = Uint32::NewFromUnsigned(length, node_isolate);
Local<Object> obj = env->buffer_constructor_function()->NewInstance(1, &arg);
smalloc::Alloc(obj, data, length);
return scope.Close(obj);
}
template <encoding encoding>
void StringSlice(const FunctionCallbackInfo<Value>& args) {
HandleScope scope(node_isolate);
ARGS_THIS(args.This())
SLICE_START_END(args[0], args[1], obj_length)
args.GetReturnValue().Set(
StringBytes::Encode(obj_data + start, length, encoding));
}
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) {
HandleScope scope(node_isolate);
Local<Object> target = args[0]->ToObject();
if (!HasInstance(target))
return ThrowTypeError("first arg should be a Buffer");
ARGS_THIS(args.This())
size_t target_length = target->GetIndexedPropertiesExternalArrayDataLength();
char* target_data = static_cast<char*>(
target->GetIndexedPropertiesExternalArrayData());
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], 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 > obj_length)
return 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),
obj_length - source_start);
memmove(target_data + target_start, obj_data + source_start, to_copy);
args.GetReturnValue().Set(to_copy);
}
// buffer.fill(value[, start][, end]);
void Fill(const FunctionCallbackInfo<Value>& args) {
HandleScope scope(node_isolate);
ARGS_THIS(args.This())
SLICE_START_END(args[1], args[2], obj_length)
args.GetReturnValue().Set(args.This());
if (args[0]->IsNumber()) {
int value = args[0]->Uint32Value() & 255;
memset(obj_data + start, value, length);
return;
}
String::Utf8Value at(args[0]);
size_t at_length = at.length();
// optimize single ascii character case
if (at_length == 1) {
int value = static_cast<int>((*at)[0]);
memset(obj_data + start, value, length);
return;
}
size_t in_there = at_length;
char* ptr = obj_data + start + at_length;
memcpy(obj_data + start, *at, MIN(at_length, length));
if (at_length >= length)
return;
while (in_there < length - in_there) {
memcpy(ptr, obj_data + start, in_there);
ptr += in_there;
in_there *= 2;
}
if (in_there < length) {
memcpy(ptr, obj_data + start, length - in_there);
in_there = length;
}
}
template <encoding encoding>
void StringWrite(const FunctionCallbackInfo<Value>& args) {
HandleScope scope(node_isolate);
ARGS_THIS(args.This())
if (!args[0]->IsString())
return ThrowTypeError("Argument must be a string");
Local<String> str = args[0]->ToString();
if (encoding == HEX && str->Length() % 2 != 0)
return 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], obj_length - offset, &max_length));
max_length = MIN(obj_length - offset, max_length);
if (max_length == 0)
return args.GetReturnValue().Set(0);
if (encoding == UCS2)
max_length = max_length / 2;
if (offset >= obj_length)
return ThrowRangeError("Offset is out of bounds");
uint32_t written = StringBytes::Write(obj_data + offset,
max_length,
str,
encoding,
NULL);
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) {
bool doAssert = !args[1]->BooleanValue();
size_t offset;
CHECK_NOT_OOB(ParseArrayIndex(args[0], 0, &offset));
if (doAssert) {
size_t len = Length(args.This());
if (offset + sizeof(T) > len || offset + sizeof(T) < offset)
return ThrowRangeError("Trying to read beyond buffer length");
}
union NoAlias {
T val;
char bytes[sizeof(T)];
};
union NoAlias na;
const void* data = args.This()->GetIndexedPropertiesExternalArrayData();
const char* ptr = static_cast<const char*>(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>
uint32_t WriteFloatGeneric(const FunctionCallbackInfo<Value>& args) {
bool doAssert = !args[2]->BooleanValue();
T val = static_cast<T>(args[0]->NumberValue());
size_t offset;
if (!ParseArrayIndex(args[1], 0, &offset)) {
ThrowRangeError("out of range index");
return 0;
}
if (doAssert) {
size_t len = Length(args.This());
if (offset + sizeof(T) > len || offset + sizeof(T) < offset) {
ThrowRangeError("Trying to write beyond buffer length");
return 0;
}
}
union NoAlias {
T val;
char bytes[sizeof(T)];
};
union NoAlias na = { val };
void* data = args.This()->GetIndexedPropertiesExternalArrayData();
char* ptr = static_cast<char*>(data) + offset;
if (endianness != GetEndianness()) Swizzle(na.bytes, sizeof(na.bytes));
memcpy(ptr, na.bytes, sizeof(na.bytes));
return offset + sizeof(na.bytes);
}
void WriteFloatLE(const FunctionCallbackInfo<Value>& args) {
args.GetReturnValue().Set(WriteFloatGeneric<float, kLittleEndian>(args));
}
void WriteFloatBE(const FunctionCallbackInfo<Value>& args) {
args.GetReturnValue().Set(WriteFloatGeneric<float, kBigEndian>(args));
}
void WriteDoubleLE(const FunctionCallbackInfo<Value>& args) {
args.GetReturnValue().Set(WriteFloatGeneric<double, kLittleEndian>(args));
}
void WriteDoubleBE(const FunctionCallbackInfo<Value>& args) {
args.GetReturnValue().Set(WriteFloatGeneric<double, kBigEndian>(args));
}
void ToArrayBuffer(const FunctionCallbackInfo<Value>& args) {
HandleScope scope(node_isolate);
ARGS_THIS(args.This());
void* adata = malloc(obj_length);
if (adata == NULL) {
FatalError("node::Buffer::ToArrayBuffer("
"const FunctionCallbackInfo<v8::Value>&)",
"Out Of Memory");
}
memcpy(adata, obj_data, obj_length);
Local<ArrayBuffer> abuf = ArrayBuffer::New(adata, obj_length);
args.GetReturnValue().Set(abuf);
}
void ByteLength(const FunctionCallbackInfo<Value> &args) {
HandleScope scope(node_isolate);
if (!args[0]->IsString())
return ThrowTypeError("Argument must be a string");
Local<String> s = args[0]->ToString();
enum encoding e = ParseEncoding(args[1], UTF8);
uint32_t size = StringBytes::Size(s, e);
args.GetReturnValue().Set(size);
}
// pass Buffer object to load prototype methods
void SetupBufferJS(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args.GetIsolate());
HandleScope handle_scope(args.GetIsolate());
assert(args[0]->IsFunction());
Local<Function> bv = args[0].As<Function>();
env->set_buffer_constructor_function(bv);
Local<Value> proto_v =
bv->Get(FIXED_ONE_BYTE_STRING(node_isolate, "prototype"));
assert(proto_v->IsObject());
Local<Object> proto = proto_v.As<Object>();
NODE_SET_METHOD(proto, "asciiSlice", AsciiSlice);
NODE_SET_METHOD(proto, "base64Slice", Base64Slice);
NODE_SET_METHOD(proto, "binarySlice", BinarySlice);
NODE_SET_METHOD(proto, "hexSlice", HexSlice);
NODE_SET_METHOD(proto, "ucs2Slice", Ucs2Slice);
NODE_SET_METHOD(proto, "utf8Slice", Utf8Slice);
NODE_SET_METHOD(proto, "asciiWrite", AsciiWrite);
NODE_SET_METHOD(proto, "base64Write", Base64Write);
NODE_SET_METHOD(proto, "binaryWrite", BinaryWrite);
NODE_SET_METHOD(proto, "hexWrite", HexWrite);
NODE_SET_METHOD(proto, "ucs2Write", Ucs2Write);
NODE_SET_METHOD(proto, "utf8Write", Utf8Write);
NODE_SET_METHOD(proto, "readDoubleBE", ReadDoubleBE);
NODE_SET_METHOD(proto, "readDoubleLE", ReadDoubleLE);
NODE_SET_METHOD(proto, "readFloatBE", ReadFloatBE);
NODE_SET_METHOD(proto, "readFloatLE", ReadFloatLE);
NODE_SET_METHOD(proto, "writeDoubleBE", WriteDoubleBE);
NODE_SET_METHOD(proto, "writeDoubleLE", WriteDoubleLE);
NODE_SET_METHOD(proto, "writeFloatBE", WriteFloatBE);
NODE_SET_METHOD(proto, "writeFloatLE", WriteFloatLE);
NODE_SET_METHOD(proto, "toArrayBuffer", ToArrayBuffer);
NODE_SET_METHOD(proto, "copy", Copy);
NODE_SET_METHOD(proto, "fill", Fill);
// for backwards compatibility
proto->Set(FIXED_ONE_BYTE_STRING(node_isolate, "offset"),
Uint32::New(0, node_isolate),
v8::ReadOnly);
assert(args[1]->IsObject());
Local<Object> internal = args[1].As<Object>();
internal->Set(FIXED_ONE_BYTE_STRING(node_isolate, "byteLength"),
FunctionTemplate::New(ByteLength)->GetFunction());
}
void Initialize(Handle<Object> target,
Handle<Value> unused,
Handle<Context> context) {
Environment* env = Environment::GetCurrent(context);
HandleScope handle_scope(env->isolate());
target->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "setupBufferJS"),
FunctionTemplate::New(SetupBufferJS)->GetFunction());
}
} // namespace Buffer
} // namespace node
NODE_MODULE_CONTEXT_AWARE(node_buffer, node::Buffer::Initialize)