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buffer: slow buffer copy compatibility fix

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Fix issue where SlowBuffers couldn't be passed as target to Buffer
copy().

Also included checks to see if Argument parameters are defined before
assigning their values. This offered ~3x's performance gain.

Backport of 16bbecc from master branch. Closes #4633.
This commit is contained in:
Trevor Norris
2013-01-22 09:09:12 -08:00
committed by Nathan Rajlich
parent 72dd3b4e25
commit 65249ccd9b
3 changed files with 14 additions and 6 deletions
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8
src/node_buffer.cc
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@@ -412,10 +412,10 @@ Handle<Value> Buffer::Copy(const Arguments &args) {
Local<Object> target = args[0]->ToObject();
char* target_data = Buffer::Data(target);
size_t target_length = Buffer::Length(target);
size_t target_start = args[1]->Uint32Value();
size_t source_start = args[2]->Uint32Value();
size_t source_end = args[3]->IsUint32() ? args[3]->Uint32Value()
: source->length_;
size_t target_start = args[1]->IsUndefined() ? 0 : args[1]->Uint32Value();
size_t source_start = args[2]->IsUndefined() ? 0 : args[2]->Uint32Value();
size_t source_end = args[3]->IsUndefined() ? source->length_
: args[3]->Uint32Value();
if (source_end < source_start) {
return ThrowException(Exception::Error(String::New(