node/src/node_buffer.cc at master · kewinwang/node · GitHub

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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 <v8.h>

#include <assert.h>

#include <stdlib.h> // malloc, free

#include <string.h> // memcpy

#ifdef __MINGW32__

# include <platform.h>

# include <platform_win32_winsock.h> // htons, htonl

#endif

#ifdef __POSIX__

# include <arpa/inet.h> // htons, htonl

#endif

#define MIN(a,b) ((a) < (b) ? (a) : (b))

namespace node {

using namespace v8;

#define SLICE_ARGS(start_arg, end_arg) \

if (!start_arg->IsInt32() || !end_arg->IsInt32()) { \

return ThrowException(Exception::TypeError( \

String::New("Bad argument."))); \

} \

int32_t start = start_arg->Int32Value(); \

int32_t end = end_arg->Int32Value(); \

if (start < 0 || end < 0) { \

return ThrowException(Exception::TypeError( \

String::New("Bad argument."))); \

} \

if (!(start <= end)) { \

return ThrowException(Exception::Error( \

String::New("Must have start <= end"))); \

} \

if ((size_t)end > parent->length_) { \

return ThrowException(Exception::Error( \

String::New("end cannot be longer than parent.length"))); \

}

static Persistent<String> length_symbol;

static Persistent<String> chars_written_sym;

static Persistent<String> write_sym;

Persistent<FunctionTemplate> Buffer::constructor_template;

static inline size_t base64_decoded_size(const char *src, size_t size) {

const char *const end = src + size;

const int remainder = size % 4;

size = (size / 4) * 3;

if (remainder) {

if (size == 0 && remainder == 1) {

// special case: 1-byte input cannot be decoded

size = 0;

} else {

// non-padded input, add 1 or 2 extra bytes

size += 1 + (remainder == 3);

}

// check for trailing padding (1 or 2 bytes)

if (size > 0) {

if (end[-1] == '=') size--;

if (end[-2] == '=') size--;

}

return size;

}

static size_t ByteLength (Handle<String> string, enum encoding enc) {

HandleScope scope;

if (enc == UTF8) {

return string->Utf8Length();

} else if (enc == BASE64) {

String::Utf8Value v(string);

return base64_decoded_size(*v, v.length());

} else if (enc == UCS2) {

return string->Length() * 2;

} else if (enc == HEX) {

return string->Length() / 2;

} else {

return string->Length();

}

Handle<Object> Buffer::New(Handle<String> string) {

HandleScope scope;

// get Buffer from global scope.

Local<Object> global = v8::Context::GetCurrent()->Global();

Local<Value> bv = global->Get(String::NewSymbol("Buffer"));

assert(bv->IsFunction());

Local<Function> b = Local<Function>::Cast(bv);

Local<Value> argv[1] = { Local<Value>::New(string) };

Local<Object> instance = b->NewInstance(1, argv);

return scope.Close(instance);

}

Buffer* Buffer::New(size_t length) {

HandleScope scope;

Local<Value> arg = Integer::NewFromUnsigned(length);

Local<Object> b = constructor_template->GetFunction()->NewInstance(1, &arg);

if (b.IsEmpty()) return NULL;

return ObjectWrap::Unwrap<Buffer>(b);

}

Buffer* Buffer::New(char* data, size_t length) {

HandleScope scope;

Local<Value> arg = Integer::NewFromUnsigned(0);

Local<Object> obj = constructor_template->GetFunction()->NewInstance(1, &arg);

Buffer *buffer = ObjectWrap::Unwrap<Buffer>(obj);

buffer->Replace(data, length, NULL, NULL);

return buffer;

}

Buffer* Buffer::New(char *data, size_t length,

free_callback callback, void *hint) {

HandleScope scope;

Local<Value> arg = Integer::NewFromUnsigned(0);

Local<Object> obj = constructor_template->GetFunction()->NewInstance(1, &arg);

Buffer *buffer = ObjectWrap::Unwrap<Buffer>(obj);

buffer->Replace(data, length, callback, hint);

return buffer;

}

Handle<Value> Buffer::New(const Arguments &args) {

if (!args.IsConstructCall()) {

return FromConstructorTemplate(constructor_template, args);

}

HandleScope scope;

Buffer *buffer;

if (args[0]->IsInt32()) {

// var buffer = new Buffer(1024);

size_t length = args[0]->Uint32Value();

buffer = new Buffer(args.This(), length);

} else {

return ThrowException(Exception::TypeError(String::New("Bad argument")));

}

return args.This();

}

Buffer::Buffer(Handle<Object> wrapper, size_t length) : ObjectWrap() {

Wrap(wrapper);

length_ = 0;

callback_ = NULL;

Replace(NULL, length, NULL, NULL);

}

Buffer::~Buffer() {

Replace(NULL, 0, NULL, NULL);

}

void Buffer::Replace(char *data, size_t length,

free_callback callback, void *hint) {

HandleScope scope;

if (callback_) {

callback_(data_, callback_hint_);

} else if (length_) {

delete [] data_;

V8::AdjustAmountOfExternalAllocatedMemory(-(sizeof(Buffer) + length_));

}

length_ = length;

callback_ = callback;

callback_hint_ = hint;

if (callback_) {

data_ = data;

} else if (length_) {

data_ = new char[length_];

if (data)

memcpy(data_, data, length_);

V8::AdjustAmountOfExternalAllocatedMemory(sizeof(Buffer) + length_);

} else {

data_ = NULL;

}

handle_->SetIndexedPropertiesToExternalArrayData(data_,

kExternalUnsignedByteArray,

length_);

handle_->Set(length_symbol, Integer::NewFromUnsigned(length_));

}

Handle<Value> Buffer::BinarySlice(const Arguments &args) {

HandleScope scope;

Buffer *parent = ObjectWrap::Unwrap<Buffer>(args.This());

SLICE_ARGS(args[0], args[1])

char *data = parent->data_ + start;

//Local<String> string = String::New(data, end - start);

Local<Value> b = Encode(data, end - start, BINARY);

return scope.Close(b);

}

Handle<Value> Buffer::AsciiSlice(const Arguments &args) {

HandleScope scope;

Buffer *parent = ObjectWrap::Unwrap<Buffer>(args.This());

SLICE_ARGS(args[0], args[1])

char* data = parent->data_ + start;

Local<String> string = String::New(data, end - start);

return scope.Close(string);

}

Handle<Value> Buffer::Utf8Slice(const Arguments &args) {

HandleScope scope;

Buffer *parent = ObjectWrap::Unwrap<Buffer>(args.This());

SLICE_ARGS(args[0], args[1])

char *data = parent->data_ + start;

Local<String> string = String::New(data, end - start);

return scope.Close(string);

}

Handle<Value> Buffer::Ucs2Slice(const Arguments &args) {

HandleScope scope;

Buffer *parent = ObjectWrap::Unwrap<Buffer>(args.This());

SLICE_ARGS(args[0], args[1])

uint16_t *data = (uint16_t*)(parent->data_ + start);

Local<String> string = String::New(data, (end - start) / 2);

return scope.Close(string);

}

static const char *base64_table = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

"abcdefghijklmnopqrstuvwxyz"

"0123456789+/";

static const int unbase64_table[] =

{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-2,-1,-1,-2,-1,-1

,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1

,-2,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63

,52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1

,-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14

,15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1

,-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40

,41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1

,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1

};

#define unbase64(x) unbase64_table[(uint8_t)(x)]

Handle<Value> Buffer::Base64Slice(const Arguments &args) {

HandleScope scope;

Buffer *parent = ObjectWrap::Unwrap<Buffer>(args.This());

SLICE_ARGS(args[0], args[1])

int n = end - start;

int out_len = (n + 2 - ((n + 2) % 3)) / 3 * 4;

char *out = new char[out_len];

uint8_t bitbuf[3];

int i = start; // data() index

int j = 0; // out index

char c;

bool b1_oob, b2_oob;

while (i < end) {

bitbuf[0] = parent->data_[i++];

if (i < end) {

bitbuf[1] = parent->data_[i];

b1_oob = false;

} else {

bitbuf[1] = 0;

b1_oob = true;

}

i++;

if (i < end) {

bitbuf[2] = parent->data_[i];

b2_oob = false;

} else {

bitbuf[2] = 0;

b2_oob = true;

}

i++;

c = bitbuf[0] >> 2;

assert(c < 64);

out[j++] = base64_table[(int)c];

assert(j < out_len);

c = ((bitbuf[0] & 0x03) << 4) | (bitbuf[1] >> 4);

assert(c < 64);

out[j++] = base64_table[(int)c];

assert(j < out_len);

if (b1_oob) {

out[j++] = '=';

} else {

c = ((bitbuf[1] & 0x0F) << 2) | (bitbuf[2] >> 6);

assert(c < 64);

out[j++] = base64_table[(int)c];

}

assert(j < out_len);

if (b2_oob) {

out[j++] = '=';

} else {

c = bitbuf[2] & 0x3F;

assert(c < 64);

out[j++] = base64_table[(int)c];

}

assert(j <= out_len);

}

Local<String> string = String::New(out, out_len);

delete [] out;

return scope.Close(string);

}

// buffer.fill(value, start, end);

Handle<Value> Buffer::Fill(const Arguments &args) {

HandleScope scope;

if (!args[0]->IsInt32()) {

return ThrowException(Exception::Error(String::New(

"value is not a number")));

}

int value = (char)args[0]->Int32Value();

Buffer *parent = ObjectWrap::Unwrap<Buffer>(args.This());

SLICE_ARGS(args[1], args[2])

memset( (void*)(parent->data_ + start),

value,

end - start);

return Undefined();

}

// var bytesCopied = buffer.copy(target, targetStart, sourceStart, sourceEnd);

Handle<Value> Buffer::Copy(const Arguments &args) {

HandleScope scope;

Buffer *source = ObjectWrap::Unwrap<Buffer>(args.This());

if (!Buffer::HasInstance(args[0])) {

return ThrowException(Exception::TypeError(String::New(

"First arg should be a Buffer")));

}

Local<Object> target = args[0]->ToObject();

char *target_data = Buffer::Data(target);

ssize_t target_length = Buffer::Length(target);

ssize_t target_start = args[1]->Int32Value();

ssize_t source_start = args[2]->Int32Value();

ssize_t source_end = args[3]->IsInt32() ? args[3]->Int32Value()

: source->length_;

if (source_end < source_start) {

return ThrowException(Exception::Error(String::New(

"sourceEnd < sourceStart")));

}

// Copy 0 bytes; we're done

if (source_end == source_start) {

return scope.Close(Integer::New(0));

}

if (target_start < 0 || target_start >= target_length) {

return ThrowException(Exception::Error(String::New(

"targetStart out of bounds")));

}

if (source_start < 0 || source_start >= source->length_) {

return ThrowException(Exception::Error(String::New(

"sourceStart out of bounds")));

}

if (source_end < 0 || source_end > source->length_) {

return ThrowException(Exception::Error(String::New(

"sourceEnd out of bounds")));

}

ssize_t to_copy = MIN(MIN(source_end - source_start,

target_length - target_start),

source->length_ - source_start);

// need to use slightly slower memmove is the ranges might overlap

memmove((void *)(target_data + target_start),

(const void*)(source->data_ + source_start),

to_copy);

return scope.Close(Integer::New(to_copy));

}

// var charsWritten = buffer.utf8Write(string, offset, [maxLength]);

Handle<Value> Buffer::Utf8Write(const Arguments &args) {

HandleScope scope;

Buffer *buffer = ObjectWrap::Unwrap<Buffer>(args.This());

if (!args[0]->IsString()) {

return ThrowException(Exception::TypeError(String::New(

"Argument must be a string")));

}

Local<String> s = args[0]->ToString();

size_t offset = args[1]->Uint32Value();

if (s->Length() > 0 && offset >= buffer->length_) {

return ThrowException(Exception::TypeError(String::New(

"Offset is out of bounds")));

}

size_t max_length = args[2]->IsUndefined() ? buffer->length_ - offset

: args[2]->Uint32Value();

max_length = MIN(buffer->length_ - offset, max_length);

char* p = buffer->data_ + offset;

int char_written;

int written = s->WriteUtf8(p,

max_length,

&char_written,

String::HINT_MANY_WRITES_EXPECTED);

constructor_template->GetFunction()->Set(chars_written_sym,

Integer::New(char_written));

if (written > 0 && p[written-1] == '\0') written--;

return scope.Close(Integer::New(written));

}

// var charsWritten = buffer.ucs2Write(string, offset, [maxLength]);

Handle<Value> Buffer::Ucs2Write(const Arguments &args) {

HandleScope scope;

Buffer *buffer = ObjectWrap::Unwrap<Buffer>(args.This());

if (!args[0]->IsString()) {

return ThrowException(Exception::TypeError(String::New(

"Argument must be a string")));

}

Local<String> s = args[0]->ToString();

size_t offset = args[1]->Uint32Value();

if (s->Length() > 0 && offset >= buffer->length_) {

return ThrowException(Exception::TypeError(String::New(

"Offset is out of bounds")));

}

size_t max_length = args[2]->IsUndefined() ? buffer->length_ - offset

: args[2]->Uint32Value();

max_length = MIN(buffer->length_ - offset, max_length) / 2;

uint16_t* p = (uint16_t*)(buffer->data_ + offset);

int written = s->Write(p,

max_length,

String::HINT_MANY_WRITES_EXPECTED);

constructor_template->GetFunction()->Set(chars_written_sym,

Integer::New(written));

return scope.Close(Integer::New(written * 2));

}

// var charsWritten = buffer.asciiWrite(string, offset);

Handle<Value> Buffer::AsciiWrite(const Arguments &args) {

HandleScope scope;

Buffer *buffer = ObjectWrap::Unwrap<Buffer>(args.This());

if (!args[0]->IsString()) {

return ThrowException(Exception::TypeError(String::New(

"Argument must be a string")));

}

Local<String> s = args[0]->ToString();

size_t offset = args[1]->Int32Value();

if (s->Length() > 0 && offset >= buffer->length_) {

return ThrowException(Exception::TypeError(String::New(

"Offset is out of bounds")));

}

size_t max_length = args[2]->IsUndefined() ? buffer->length_ - offset

: args[2]->Uint32Value();

max_length = MIN(s->Length(), MIN(buffer->length_ - offset, max_length));

char *p = buffer->data_ + offset;

int written = s->WriteAscii(p,

max_length,

String::HINT_MANY_WRITES_EXPECTED);

return scope.Close(Integer::New(written));

}

// var bytesWritten = buffer.base64Write(string, offset, [maxLength]);

Handle<Value> Buffer::Base64Write(const Arguments &args) {

HandleScope scope;

assert(unbase64('/') == 63);

assert(unbase64('+') == 62);

assert(unbase64('T') == 19);

assert(unbase64('Z') == 25);

assert(unbase64('t') == 45);

assert(unbase64('z') == 51);

assert(unbase64(' ') == -2);

assert(unbase64('\n') == -2);

assert(unbase64('\r') == -2);

Buffer *buffer = ObjectWrap::Unwrap<Buffer>(args.This());

if (!args[0]->IsString()) {

return ThrowException(Exception::TypeError(String::New(

"Argument must be a string")));

}

String::AsciiValue s(args[0]->ToString());

size_t offset = args[1]->Int32Value();

// handle zero-length buffers graciously

if (offset == 0 && buffer->length_ == 0) {

return scope.Close(Integer::New(0));

}

if (offset >= buffer->length_) {

return ThrowException(Exception::TypeError(String::New(

"Offset is out of bounds")));

}

const size_t size = base64_decoded_size(*s, s.length());

if (size > buffer->length_ - offset) {

// throw exception, don't silently truncate

return ThrowException(Exception::TypeError(String::New(

"Buffer too small")));

}

char a, b, c, d;

char* start = buffer->data_ + offset;

char* dst = start;

const char *src = *s;

const char *const srcEnd = src + s.length();

while (src < srcEnd) {

int remaining = srcEnd - src;

while (unbase64(*src) < 0 && src < srcEnd) {

src++;

remaining--;

}

if (remaining == 0 || *src == '=') break;

a = unbase64(*src++);

while (unbase64(*src) < 0 && src < srcEnd) {

src++;

remaining--;

}

if (remaining <= 1 || *src == '=') break;

b = unbase64(*src++);

*dst++ = (a << 2) | ((b & 0x30) >> 4);

while (unbase64(*src) < 0 && src < srcEnd) {

src++;

remaining--;

}

if (remaining <= 2 || *src == '=') break;

c = unbase64(*src++);

*dst++ = ((b & 0x0F) << 4) | ((c & 0x3C) >> 2);

while (unbase64(*src) < 0 && src < srcEnd) {

src++;

remaining--;

}

if (remaining <= 3 || *src == '=') break;

d = unbase64(*src++);

*dst++ = ((c & 0x03) << 6) | (d & 0x3F);

}

return scope.Close(Integer::New(dst - start));

}

Handle<Value> Buffer::BinaryWrite(const Arguments &args) {

HandleScope scope;

Buffer *buffer = ObjectWrap::Unwrap<Buffer>(args.This());

if (!args[0]->IsString()) {

return ThrowException(Exception::TypeError(String::New(

"Argument must be a string")));

}

Local<String> s = args[0]->ToString();

size_t offset = args[1]->Int32Value();

if (s->Length() > 0 && offset >= buffer->length_) {

return ThrowException(Exception::TypeError(String::New(

"Offset is out of bounds")));

}

char *p = (char*)buffer->data_ + offset;

size_t towrite = MIN((unsigned long) s->Length(), buffer->length_ - offset);

int written = DecodeWrite(p, towrite, s, BINARY);

return scope.Close(Integer::New(written));

}

// var nbytes = Buffer.byteLength("string", "utf8")

Handle<Value> Buffer::ByteLength(const Arguments &args) {

HandleScope scope;

if (!args[0]->IsString()) {

return ThrowException(Exception::TypeError(String::New(

"Argument must be a string")));

}

Local<String> s = args[0]->ToString();

enum encoding e = ParseEncoding(args[1], UTF8);

return scope.Close(Integer::New(node::ByteLength(s, e)));

}

Handle<Value> Buffer::MakeFastBuffer(const Arguments &args) {

HandleScope scope;

if (!Buffer::HasInstance(args[0])) {

return ThrowException(Exception::TypeError(String::New(

"First argument must be a Buffer")));

}

Buffer *buffer = ObjectWrap::Unwrap<Buffer>(args[0]->ToObject());

Local<Object> fast_buffer = args[1]->ToObject();;

uint32_t offset = args[2]->Uint32Value();

uint32_t length = args[3]->Uint32Value();

fast_buffer->SetIndexedPropertiesToExternalArrayData(buffer->data_ + offset,

kExternalUnsignedByteArray,

length);

return Undefined();

}

bool Buffer::HasInstance(v8::Handle<v8::Value> val) {

if (!val->IsObject()) return false;

v8::Local<v8::Object> obj = val->ToObject();

if (obj->GetIndexedPropertiesExternalArrayDataType() == kExternalUnsignedByteArray)

return true;

// Also check for SlowBuffers that are empty.

if (constructor_template->HasInstance(obj))

return true;

return false;

}

void Buffer::Initialize(Handle<Object> target) {

HandleScope scope;

length_symbol = Persistent<String>::New(String::NewSymbol("length"));

chars_written_sym = Persistent<String>::New(String::NewSymbol("_charsWritten"));

Local<FunctionTemplate> t = FunctionTemplate::New(Buffer::New);

constructor_template = Persistent<FunctionTemplate>::New(t);

constructor_template->InstanceTemplate()->SetInternalFieldCount(1);

constructor_template->SetClassName(String::NewSymbol("SlowBuffer"));

// copy free

NODE_SET_PROTOTYPE_METHOD(constructor_template, "binarySlice", Buffer::BinarySlice);

NODE_SET_PROTOTYPE_METHOD(constructor_template, "asciiSlice", Buffer::AsciiSlice);

NODE_SET_PROTOTYPE_METHOD(constructor_template, "base64Slice", Buffer::Base64Slice);

NODE_SET_PROTOTYPE_METHOD(constructor_template, "ucs2Slice", Buffer::Ucs2Slice);

// TODO NODE_SET_PROTOTYPE_METHOD(t, "utf16Slice", Utf16Slice);

// copy

NODE_SET_PROTOTYPE_METHOD(constructor_template, "utf8Slice", Buffer::Utf8Slice);

NODE_SET_PROTOTYPE_METHOD(constructor_template, "utf8Write", Buffer::Utf8Write);

NODE_SET_PROTOTYPE_METHOD(constructor_template, "asciiWrite", Buffer::AsciiWrite);

NODE_SET_PROTOTYPE_METHOD(constructor_template, "binaryWrite", Buffer::BinaryWrite);

NODE_SET_PROTOTYPE_METHOD(constructor_template, "base64Write", Buffer::Base64Write);

NODE_SET_PROTOTYPE_METHOD(constructor_template, "ucs2Write", Buffer::Ucs2Write);

NODE_SET_PROTOTYPE_METHOD(constructor_template, "fill", Buffer::Fill);

NODE_SET_PROTOTYPE_METHOD(constructor_template, "copy", Buffer::Copy);

NODE_SET_METHOD(constructor_template->GetFunction(),

"byteLength",

Buffer::ByteLength);

NODE_SET_METHOD(constructor_template->GetFunction(),

"makeFastBuffer",

Buffer::MakeFastBuffer);

target->Set(String::NewSymbol("SlowBuffer"), constructor_template->GetFunction());

}

} // namespace node

NODE_MODULE(node_buffer, node::Buffer::Initialize);

node/src/node_buffer.cc at master · kewinwang/node · GitHub

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