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544 lines
16 KiB
544 lines
16 KiB
#include <node_buffer.h>
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#include <assert.h>
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#include <stdlib.h> // malloc, free
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#include <v8.h>
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#include <string.h> // memcpy
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#include <arpa/inet.h> // htons, htonl
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#include <node.h>
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#define MIN(a,b) ((a) < (b) ? (a) : (b))
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namespace node {
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using namespace v8;
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#define SLICE_ARGS(start_arg, end_arg) \
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if (!start_arg->IsInt32() || !end_arg->IsInt32()) { \
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return ThrowException(Exception::TypeError( \
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String::New("Bad argument."))); \
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} \
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int32_t start = start_arg->Int32Value(); \
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int32_t end = end_arg->Int32Value(); \
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if (start < 0 || end < 0) { \
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return ThrowException(Exception::TypeError( \
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String::New("Bad argument."))); \
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} \
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if (!(start <= end)) { \
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return ThrowException(Exception::Error( \
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String::New("Must have start <= end"))); \
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} \
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if ((size_t)end > parent->length_) { \
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return ThrowException(Exception::Error( \
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String::New("end cannot be longer than parent.length"))); \
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}
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static Persistent<String> length_symbol;
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static Persistent<String> chars_written_sym;
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static Persistent<String> write_sym;
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Persistent<FunctionTemplate> Buffer::constructor_template;
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// Each javascript Buffer object is backed by a Blob object.
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// the Blob is just a C-level chunk of bytes.
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// It has a reference count.
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struct Blob_ {
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unsigned int refs;
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size_t length;
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char *data;
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};
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typedef struct Blob_ Blob;
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static inline Blob * blob_new(size_t length) {
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Blob * blob = (Blob*) malloc(sizeof(Blob));
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if (!blob) return NULL;
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blob->data = (char*) malloc(length);
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if (!blob->data) {
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free(blob);
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return NULL;
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}
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V8::AdjustAmountOfExternalAllocatedMemory(sizeof(Blob) + length);
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blob->length = length;
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blob->refs = 0;
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return blob;
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}
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static inline void blob_ref(Blob *blob) {
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blob->refs++;
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}
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static inline void blob_unref(Blob *blob) {
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assert(blob->refs > 0);
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if (--blob->refs == 0) {
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//fprintf(stderr, "free %d bytes\n", blob->length);
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V8::AdjustAmountOfExternalAllocatedMemory(-(sizeof(Blob) + blob->length));
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free(blob->data);
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free(blob);
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}
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}
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#if 0
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// When someone calls buffer.asciiSlice, data is not copied. Instead V8
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// references in the underlying Blob with this ExternalAsciiStringResource.
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class AsciiSliceExt: public String::ExternalAsciiStringResource {
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friend class Buffer;
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public:
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AsciiSliceExt(Buffer *parent, size_t start, size_t end) {
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blob_ = parent->blob();
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blob_ref(blob_);
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assert(start <= end);
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length_ = end - start;
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assert(start + length_ <= parent->length());
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data_ = parent->data() + start;
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}
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~AsciiSliceExt() {
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//fprintf(stderr, "free ascii slice (%d refs left)\n", blob_->refs);
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blob_unref(blob_);
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}
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const char* data() const { return data_; }
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size_t length() const { return length_; }
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private:
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const char *data_;
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size_t length_;
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Blob *blob_;
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};
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#endif
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Buffer* Buffer::New(size_t size) {
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HandleScope scope;
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Local<Value> arg = Integer::NewFromUnsigned(size);
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Local<Object> b = constructor_template->GetFunction()->NewInstance(1, &arg);
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return ObjectWrap::Unwrap<Buffer>(b);
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}
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Handle<Value> Buffer::New(const Arguments &args) {
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HandleScope scope;
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Buffer *buffer;
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if (args[0]->IsInt32()) {
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// var buffer = new Buffer(1024);
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size_t length = args[0]->Uint32Value();
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buffer = new Buffer(length);
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} else if (args[0]->IsArray()) {
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Local<Array> a = Local<Array>::Cast(args[0]);
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buffer = new Buffer(a->Length());
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char *p = buffer->data();
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for (int i = 0; i < a->Length(); i++) {
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p[i] = a->Get(i)->Uint32Value();
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}
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} else if (args[0]->IsString()) {
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Local<String> s = args[0]->ToString();
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enum encoding e = ParseEncoding(args[1], UTF8);
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int length = e == UTF8 ? s->Utf8Length() : s->Length();
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buffer = new Buffer(length);
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} else if (Buffer::HasInstance(args[0]) && args.Length() > 2) {
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// var slice = new Buffer(buffer, 123, 130);
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// args: parent, start, end
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Buffer *parent = ObjectWrap::Unwrap<Buffer>(args[0]->ToObject());
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SLICE_ARGS(args[1], args[2])
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buffer = new Buffer(parent, start, end);
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} else {
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return ThrowException(Exception::TypeError(String::New("Bad argument")));
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}
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buffer->Wrap(args.This());
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args.This()->SetIndexedPropertiesToExternalArrayData(buffer->data(),
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kExternalUnsignedByteArray,
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buffer->length());
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args.This()->Set(length_symbol, Integer::New(buffer->length_));
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if (args[0]->IsString()) {
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if (write_sym.IsEmpty()) {
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write_sym = Persistent<String>::New(String::NewSymbol("write"));
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}
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Local<Value> write_v = args.This()->Get(write_sym);
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assert(write_v->IsFunction());
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Local<Function> write = Local<Function>::Cast(write_v);
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Local<Value> argv[2] = { args[0], args[1] };
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TryCatch try_catch;
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write->Call(args.This(), 2, argv);
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if (try_catch.HasCaught()) {
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FatalException(try_catch);
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}
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}
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return args.This();
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}
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Buffer::Buffer(size_t length) : ObjectWrap() {
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blob_ = blob_new(length);
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off_ = 0;
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length_ = length;
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blob_ref(blob_);
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V8::AdjustAmountOfExternalAllocatedMemory(sizeof(Buffer));
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}
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Buffer::Buffer(Buffer *parent, size_t start, size_t end) : ObjectWrap() {
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blob_ = parent->blob_;
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assert(blob_->refs > 0);
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blob_ref(blob_);
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assert(start <= end);
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off_ = parent->off_ + start;
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length_ = end - start;
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assert(length_ <= parent->length_);
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V8::AdjustAmountOfExternalAllocatedMemory(sizeof(Buffer));
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}
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Buffer::~Buffer() {
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assert(blob_->refs > 0);
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//fprintf(stderr, "free buffer (%d refs left)\n", blob_->refs);
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blob_unref(blob_);
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V8::AdjustAmountOfExternalAllocatedMemory(-static_cast<long int>(sizeof(Buffer)));
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}
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char* Buffer::data() {
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return blob_->data + off_;
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}
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Handle<Value> Buffer::BinarySlice(const Arguments &args) {
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HandleScope scope;
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Buffer *parent = ObjectWrap::Unwrap<Buffer>(args.This());
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SLICE_ARGS(args[0], args[1])
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const char *data = const_cast<char*>(parent->data() + start);
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//Local<String> string = String::New(data, end - start);
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Local<Value> b = Encode(data, end - start, BINARY);
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return scope.Close(b);
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}
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Handle<Value> Buffer::AsciiSlice(const Arguments &args) {
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HandleScope scope;
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Buffer *parent = ObjectWrap::Unwrap<Buffer>(args.This());
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SLICE_ARGS(args[0], args[1])
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#if 0
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AsciiSliceExt *ext = new AsciiSliceExt(parent, start, end);
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Local<String> string = String::NewExternal(ext);
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// There should be at least two references to the blob now - the parent
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// and the slice.
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assert(parent->blob_->refs >= 2);
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#endif
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const char *data = const_cast<char*>(parent->data() + start);
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Local<String> string = String::New(data, end - start);
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return scope.Close(string);
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}
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Handle<Value> Buffer::Utf8Slice(const Arguments &args) {
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HandleScope scope;
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Buffer *parent = ObjectWrap::Unwrap<Buffer>(args.This());
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SLICE_ARGS(args[0], args[1])
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const char *data = const_cast<char*>(parent->data() + start);
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Local<String> string = String::New(data, end - start);
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return scope.Close(string);
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}
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Handle<Value> Buffer::Slice(const Arguments &args) {
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HandleScope scope;
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Local<Value> argv[3] = { args.This(), args[0], args[1] };
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Local<Object> slice =
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constructor_template->GetFunction()->NewInstance(3, argv);
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return scope.Close(slice);
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}
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// var bytesCopied = buffer.copy(target, targetStart, sourceStart, sourceEnd);
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Handle<Value> Buffer::Copy(const Arguments &args) {
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HandleScope scope;
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Buffer *source = ObjectWrap::Unwrap<Buffer>(args.This());
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if (!Buffer::HasInstance(args[0])) {
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return ThrowException(Exception::TypeError(String::New(
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"First arg should be a Buffer")));
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}
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Buffer *target = ObjectWrap::Unwrap<Buffer>(args[0]->ToObject());
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ssize_t target_start = args[1]->Int32Value();
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ssize_t source_start = args[2]->Int32Value();
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ssize_t source_end = args[3]->IsInt32() ? args[3]->Int32Value()
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: source->length();
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if (source_end < source_start) {
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return ThrowException(Exception::Error(String::New(
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"sourceEnd < sourceStart")));
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}
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if (target_start < 0 || target_start > target->length()) {
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return ThrowException(Exception::Error(String::New(
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"targetStart out of bounds")));
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}
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if (source_start < 0 || source_start > source->length()) {
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return ThrowException(Exception::Error(String::New(
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"sourceStart out of bounds")));
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}
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if (source_end < 0 || source_end > source->length()) {
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return ThrowException(Exception::Error(String::New(
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"sourceEnd out of bounds")));
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}
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ssize_t to_copy = MIN(source_end - source_start,
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target->length() - target_start);
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memcpy((void*)(target->data() + target_start),
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(const void*)(source->data() + source_start),
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to_copy);
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return scope.Close(Integer::New(to_copy));
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}
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// var charsWritten = buffer.utf8Write(string, offset);
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Handle<Value> Buffer::Utf8Write(const Arguments &args) {
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HandleScope scope;
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Buffer *buffer = ObjectWrap::Unwrap<Buffer>(args.This());
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if (!args[0]->IsString()) {
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return ThrowException(Exception::TypeError(String::New(
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"Argument must be a string")));
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}
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Local<String> s = args[0]->ToString();
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size_t offset = args[1]->Int32Value();
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if (offset >= buffer->length_) {
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return ThrowException(Exception::TypeError(String::New(
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"Offset is out of bounds")));
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}
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const char *p = buffer->data() + offset;
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int char_written;
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int written = s->WriteUtf8((char*)p,
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buffer->length_ - offset,
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&char_written,
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String::HINT_MANY_WRITES_EXPECTED);
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constructor_template->GetFunction()->Set(chars_written_sym,
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Integer::New(char_written));
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if (written > 0 && p[written-1] == '\0') written--;
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return scope.Close(Integer::New(written));
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}
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// var charsWritten = buffer.asciiWrite(string, offset);
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Handle<Value> Buffer::AsciiWrite(const Arguments &args) {
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HandleScope scope;
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Buffer *buffer = ObjectWrap::Unwrap<Buffer>(args.This());
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if (!args[0]->IsString()) {
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return ThrowException(Exception::TypeError(String::New(
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"Argument must be a string")));
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}
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Local<String> s = args[0]->ToString();
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size_t offset = args[1]->Int32Value();
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if (offset >= buffer->length_) {
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return ThrowException(Exception::TypeError(String::New(
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"Offset is out of bounds")));
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}
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const char *p = buffer->data() + offset;
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size_t towrite = MIN((unsigned long) s->Length(), buffer->length_ - offset);
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int written = s->WriteAscii((char*)p, 0, towrite, String::HINT_MANY_WRITES_EXPECTED);
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return scope.Close(Integer::New(written));
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}
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Handle<Value> Buffer::BinaryWrite(const Arguments &args) {
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HandleScope scope;
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Buffer *buffer = ObjectWrap::Unwrap<Buffer>(args.This());
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if (!args[0]->IsString()) {
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return ThrowException(Exception::TypeError(String::New(
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"Argument must be a string")));
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}
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Local<String> s = args[0]->ToString();
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size_t offset = args[1]->Int32Value();
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if (offset >= buffer->length_) {
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return ThrowException(Exception::TypeError(String::New(
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"Offset is out of bounds")));
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}
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char *p = (char*)buffer->data() + offset;
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size_t towrite = MIN((unsigned long) s->Length(), buffer->length_ - offset);
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int written = DecodeWrite(p, towrite, s, BINARY);
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return scope.Close(Integer::New(written));
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}
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// buffer.unpack(format, index);
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// Starting at 'index', unpacks binary from the buffer into an array.
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// 'format' is a string
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//
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// FORMAT RETURNS
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// N uint32_t a 32bit unsigned integer in network byte order
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// n uint16_t a 16bit unsigned integer in network byte order
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// o uint8_t a 8bit unsigned integer
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Handle<Value> Buffer::Unpack(const Arguments &args) {
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HandleScope scope;
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Buffer *buffer = ObjectWrap::Unwrap<Buffer>(args.This());
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if (!args[0]->IsString()) {
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return ThrowException(Exception::TypeError(String::New(
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"Argument must be a string")));
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}
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String::AsciiValue format(args[0]->ToString());
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uint32_t index = args[1]->Uint32Value();
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#define OUT_OF_BOUNDS ThrowException(Exception::Error(String::New("Out of bounds")))
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Local<Array> array = Array::New(format.length());
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uint8_t uint8;
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uint16_t uint16;
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uint32_t uint32;
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for (int i = 0; i < format.length(); i++) {
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switch ((*format)[i]) {
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// 32bit unsigned integer in network byte order
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case 'N':
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if (index + 3 >= buffer->length_) return OUT_OF_BOUNDS;
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uint32 = htonl(*(uint32_t*)(buffer->data() + index));
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array->Set(Integer::New(i), Integer::NewFromUnsigned(uint32));
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index += 4;
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break;
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// 16bit unsigned integer in network byte order
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case 'n':
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if (index + 1 >= buffer->length_) return OUT_OF_BOUNDS;
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uint16 = htons(*(uint16_t*)(buffer->data() + index));
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array->Set(Integer::New(i), Integer::NewFromUnsigned(uint16));
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index += 2;
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break;
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// a single octet, unsigned.
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case 'o':
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if (index >= buffer->length_) return OUT_OF_BOUNDS;
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uint8 = (uint8_t)buffer->data()[index];
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array->Set(Integer::New(i), Integer::NewFromUnsigned(uint8));
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index += 1;
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break;
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default:
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return ThrowException(Exception::Error(
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String::New("Unknown format character")));
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}
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}
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return scope.Close(array);
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}
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// var nbytes = Buffer.byteLength("string", "utf8")
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Handle<Value> Buffer::ByteLength(const Arguments &args) {
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HandleScope scope;
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if (!args[0]->IsString()) {
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return ThrowException(Exception::TypeError(String::New(
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"Argument must be a string")));
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}
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Local<String> s = args[0]->ToString();
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enum encoding e = ParseEncoding(args[1], UTF8);
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Local<Integer> length =
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Integer::New(e == UTF8 ? s->Utf8Length() : s->Length());
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return scope.Close(length);
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}
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void Buffer::Initialize(Handle<Object> target) {
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HandleScope scope;
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length_symbol = Persistent<String>::New(String::NewSymbol("length"));
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chars_written_sym = Persistent<String>::New(String::NewSymbol("_charsWritten"));
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Local<FunctionTemplate> t = FunctionTemplate::New(Buffer::New);
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constructor_template = Persistent<FunctionTemplate>::New(t);
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constructor_template->InstanceTemplate()->SetInternalFieldCount(1);
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constructor_template->SetClassName(String::NewSymbol("Buffer"));
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// copy free
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NODE_SET_PROTOTYPE_METHOD(constructor_template, "binarySlice", Buffer::BinarySlice);
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NODE_SET_PROTOTYPE_METHOD(constructor_template, "asciiSlice", Buffer::AsciiSlice);
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NODE_SET_PROTOTYPE_METHOD(constructor_template, "slice", Buffer::Slice);
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// TODO NODE_SET_PROTOTYPE_METHOD(t, "utf16Slice", Utf16Slice);
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// copy
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NODE_SET_PROTOTYPE_METHOD(constructor_template, "utf8Slice", Buffer::Utf8Slice);
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NODE_SET_PROTOTYPE_METHOD(constructor_template, "utf8Write", Buffer::Utf8Write);
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NODE_SET_PROTOTYPE_METHOD(constructor_template, "asciiWrite", Buffer::AsciiWrite);
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NODE_SET_PROTOTYPE_METHOD(constructor_template, "binaryWrite", Buffer::BinaryWrite);
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NODE_SET_PROTOTYPE_METHOD(constructor_template, "unpack", Buffer::Unpack);
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NODE_SET_PROTOTYPE_METHOD(constructor_template, "copy", Buffer::Copy);
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NODE_SET_METHOD(constructor_template->GetFunction(),
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"byteLength",
|
|
Buffer::ByteLength);
|
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|
|
target->Set(String::NewSymbol("Buffer"), constructor_template->GetFunction());
|
|
}
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|
|
} // namespace node
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|