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611 lines
17 KiB
611 lines
17 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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static inline size_t base64_decoded_size(const char *src, size_t size) {
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const char *const end = src + size;
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const int remainder = size % 4;
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size = (size / 4) * 3;
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if (remainder) {
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if (size == 0 && remainder == 1) {
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// special case: 1-byte input cannot be decoded
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size = 0;
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} else {
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// non-padded input, add 1 or 2 extra bytes
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size += 1 + (remainder == 3);
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}
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}
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// check for trailing padding (1 or 2 bytes)
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if (size > 0) {
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if (end[-1] == '=') size--;
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if (end[-2] == '=') size--;
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}
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return size;
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}
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static size_t ByteLength (Handle<String> string, enum encoding enc) {
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HandleScope scope;
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if (enc == UTF8) {
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return string->Utf8Length();
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} else if (enc == BASE64) {
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String::Utf8Value v(string);
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return base64_decoded_size(*v, v.length());
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} else {
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return string->Length();
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}
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}
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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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char* Buffer::Data(Handle<Object> obj) {
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if (obj->HasIndexedPropertiesInPixelData()) {
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return (char*)obj->GetIndexedPropertiesPixelData();
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}
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HandleScope scope;
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// Return true for "SlowBuffer"
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if (constructor_template->HasInstance(obj)) {
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return ObjectWrap::Unwrap<Buffer>(obj)->data();
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}
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// Not a buffer.
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return NULL;
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}
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size_t Buffer::Length(Handle<Object> obj) {
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if (obj->HasIndexedPropertiesInPixelData()) {
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return (size_t)obj->GetIndexedPropertiesPixelDataLength();
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}
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HandleScope scope;
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// Return true for "SlowBuffer"
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if (constructor_template->HasInstance(obj)) {
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return ObjectWrap::Unwrap<Buffer>(obj)->length();
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}
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// Not a buffer.
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return 0;
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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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if (!args.IsConstructCall()) {
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Local<Value> argv[10];
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for (int i = 0; i < MIN(args.Length(), 10); i++) {
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argv[i] = args[i];
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}
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Local<Object> instance =
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constructor_template->GetFunction()->NewInstance(args.Length(), argv);
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return scope.Close(instance);
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}
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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 {
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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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return args.This();
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}
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Buffer::Buffer(size_t length) : ObjectWrap() {
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off_ = 0;
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length_ = length;
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data_ = new char[length_];
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V8::AdjustAmountOfExternalAllocatedMemory(sizeof(Buffer) + length_);
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}
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Buffer::~Buffer() {
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//fprintf(stderr, "free buffer (%d refs left)\n", blob_->refs);
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delete data_;
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V8::AdjustAmountOfExternalAllocatedMemory(-(sizeof(Buffer) + length_));
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}
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char* Buffer::data() {
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return data_;
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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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char *data = 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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char* data = 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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char *data = 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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static const char *base64_table = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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static const int unbase64_table[] =
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{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
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,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
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,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63
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,52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1
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,-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14
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,15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1
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,-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40
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,41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1
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};
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Handle<Value> Buffer::Base64Slice(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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int n = end - start;
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int out_len = (n + 2 - ((n + 2) % 3)) / 3 * 4;
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char *out = new char[out_len];
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uint8_t bitbuf[3];
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int i = start; // data() index
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int j = 0; // out index
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char c;
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bool b1_oob, b2_oob;
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while (i < end) {
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bitbuf[0] = parent->data()[i++];
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if (i < end) {
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bitbuf[1] = parent->data()[i];
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b1_oob = false;
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} else {
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bitbuf[1] = 0;
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b1_oob = true;
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}
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i++;
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if (i < end) {
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bitbuf[2] = parent->data()[i];
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b2_oob = false;
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} else {
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bitbuf[2] = 0;
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b2_oob = true;
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}
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i++;
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c = bitbuf[0] >> 2;
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assert(c < 64);
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out[j++] = base64_table[c];
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assert(j < out_len);
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c = ((bitbuf[0] & 0x03) << 4) | (bitbuf[1] >> 4);
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assert(c < 64);
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out[j++] = base64_table[c];
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assert(j < out_len);
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if (b1_oob) {
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out[j++] = '=';
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} else {
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c = ((bitbuf[1] & 0x0F) << 2) | (bitbuf[2] >> 6);
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assert(c < 64);
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out[j++] = base64_table[c];
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}
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assert(j < out_len);
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if (b2_oob) {
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out[j++] = '=';
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} else {
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c = bitbuf[2] & 0x3F;
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assert(c < 64);
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out[j++] = base64_table[c];
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}
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assert(j <= out_len);
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}
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Local<String> string = String::New(out, out_len);
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delete [] out;
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return scope.Close(string);
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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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// Copy 0 bytes; we're done
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if (source_end == source_start) {
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return scope.Close(Integer::New(0));
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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(MIN(source_end - source_start,
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target->length() - target_start),
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source->length() - source_start);
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// need to use slightly slower memmove is the ranges might overlap
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memmove((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, [maxLength]);
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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]->Uint32Value();
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if (s->Utf8Length() > 0 && 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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size_t max_length = args[2]->IsUndefined() ? buffer->length_ - offset
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: args[2]->Uint32Value();
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max_length = MIN(buffer->length_ - offset, max_length);
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char* p = buffer->data() + offset;
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int char_written;
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int written = s->WriteUtf8(p,
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max_length,
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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 (s->Length() > 0 && 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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size_t max_length = args[2]->IsUndefined() ? buffer->length_ - offset
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: args[2]->Uint32Value();
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max_length = MIN(s->Length(), MIN(buffer->length_ - offset, max_length));
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char *p = buffer->data() + offset;
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int written = s->WriteAscii(p,
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0,
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max_length,
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String::HINT_MANY_WRITES_EXPECTED);
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return scope.Close(Integer::New(written));
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}
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// var bytesWritten = buffer.base64Write(string, offset, [maxLength]);
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Handle<Value> Buffer::Base64Write(const Arguments &args) {
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HandleScope scope;
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assert(unbase64_table['/'] == 63);
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assert(unbase64_table['+'] == 62);
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assert(unbase64_table['T'] == 19);
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assert(unbase64_table['Z'] == 25);
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assert(unbase64_table['t'] == 45);
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assert(unbase64_table['z'] == 51);
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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 s(args[0]->ToString());
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size_t offset = args[1]->Int32Value();
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// handle zero-length buffers graciously
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if (offset == 0 && buffer->length_ == 0) {
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return scope.Close(Integer::New(0));
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}
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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 size_t size = base64_decoded_size(*s, s.length());
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if (size > buffer->length_ - offset) {
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// throw exception, don't silently truncate
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return ThrowException(Exception::TypeError(String::New(
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"Buffer too small")));
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}
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char a, b, c, d;
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char* dst = buffer->data() + offset;
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const char *src = *s;
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const char *const srcEnd = src + s.length();
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while (src < srcEnd) {
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const int remaining = srcEnd - src;
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if (remaining == 0 || *src == '=') break;
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a = unbase64_table[*src++];
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if (remaining == 1 || *src == '=') break;
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b = unbase64_table[*src++];
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*dst++ = (a << 2) | ((b & 0x30) >> 4);
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if (remaining == 2 || *src == '=') break;
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c = unbase64_table[*src++];
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*dst++ = ((b & 0x0F) << 4) | ((c & 0x3C) >> 2);
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if (remaining == 3 || *src == '=') break;
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d = unbase64_table[*src++];
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*dst++ = ((c & 0x03) << 6) | (d & 0x3F);
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}
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return scope.Close(Integer::New(size));
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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 (s->Length() > 0 && 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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// 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();
|
|
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;
|
|
|
|
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->SetIndexedPropertiesToPixelData((uint8_t*)buffer->data() + offset,
|
|
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->HasIndexedPropertiesInPixelData()) return true;
|
|
|
|
// Return true for "SlowBuffer"
|
|
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);
|
|
// 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, "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);
|
|
|