buffer: fix signedness compiler warnings

src/node_buffer.cc

@@ -406,12 +406,11 @@ Handle<Value> Buffer::Copy(const Arguments &args) {
   }
 
   Local<Object> target = args[0]->ToObject();
-  char *target_data = Buffer::Data(target);
+  char* target_data = Buffer::Data(target);
-  ssize_t target_length = Buffer::Length(target);
+  size_t target_length = Buffer::Length(target);
-
+  size_t target_start = args[1]->Uint32Value();
-  ssize_t target_start = args[1]->Int32Value();
+  size_t source_start = args[2]->Uint32Value();
-  ssize_t source_start = args[2]->Int32Value();
+  size_t source_end = args[3]->IsUint32() ? args[3]->Uint32Value()
-  ssize_t source_end = args[3]->IsInt32() ? args[3]->Int32Value()
                                           : source->length_;
 
   if (source_end < source_start) {
@@ -424,25 +423,24 @@ Handle<Value> Buffer::Copy(const Arguments &args) {
     return scope.Close(Integer::New(0));
   }
 
-  if (target_start < 0 || target_start >= target_length) {
+  if (target_start >= target_length) {
     return ThrowException(Exception::Error(String::New(
             "targetStart out of bounds")));
   }
 
-  if (source_start < 0 || source_start >= source->length_) {
+  if (source_start >= source->length_) {
     return ThrowException(Exception::Error(String::New(
             "sourceStart out of bounds")));
   }
 
-  if (source_end < 0 || source_end > source->length_) {
+  if (source_end > source->length_) {
     return ThrowException(Exception::Error(String::New(
             "sourceEnd out of bounds")));
   }
 
-  ssize_t to_copy = MIN(MIN(source_end - source_start,
+  size_t to_copy = MIN(MIN(source_end - source_start,
-                            target_length - target_start),
+                           target_length - target_start),
-                            source->length_ - source_start);
+                           source->length_ - source_start);
-
 
   // need to use slightly slower memmove is the ranges might overlap
   memmove((void *)(target_data + target_start),
@@ -551,17 +549,17 @@ Handle<Value> Buffer::AsciiWrite(const Arguments &args) {
   }
 
   Local<String> s = args[0]->ToString();
-
+  size_t length = s->Length();
   size_t offset = args[1]->Int32Value();
 
-  if (s->Length() > 0 && offset >= buffer->length_) {
+  if (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));
+  max_length = MIN(length, MIN(buffer->length_ - offset, max_length));
 
   char *p = buffer->data_ + offset;
 
@@ -590,10 +588,11 @@ Handle<Value> Buffer::Base64Write(const Arguments &args) {
   }
 
   String::AsciiValue s(args[0]);
+  size_t length = s.length();
   size_t offset = args[1]->Int32Value();
   size_t max_length = args[2]->IsUndefined() ? buffer->length_ - offset
                                              : args[2]->Uint32Value();
-  max_length = MIN(s.length(), MIN(buffer->length_ - offset, max_length));
+  max_length = MIN(length, MIN(buffer->length_ - offset, max_length));
 
   if (max_length && offset >= buffer->length_) {
     return ThrowException(Exception::TypeError(String::New(
@@ -653,7 +652,7 @@ Handle<Value> Buffer::BinaryWrite(const Arguments &args) {
   }
 
   Local<String> s = args[0]->ToString();
-
+  size_t length = s->Length();
   size_t offset = args[1]->Int32Value();
 
   if (s->Length() > 0 && offset >= buffer->length_) {
@@ -665,7 +664,7 @@ Handle<Value> Buffer::BinaryWrite(const Arguments &args) {
 
   size_t max_length = args[2]->IsUndefined() ? buffer->length_ - offset
                                              : args[2]->Uint32Value();
-  max_length = MIN(s->Length(), MIN(buffer->length_ - offset, max_length));
+  max_length = MIN(length, MIN(buffer->length_ - offset, max_length));
 
   int written = DecodeWrite(p, max_length, s, BINARY);
 

src/node_buffer.h

@@ -66,7 +66,7 @@ namespace node {
 class NODE_EXTERN Buffer: public ObjectWrap {
  public:
   // mirrors deps/v8/src/objects.h
-  static const int kMaxLength = 0x3fffffff;
+  static const unsigned int kMaxLength = 0x3fffffff;
 
   static v8::Persistent<v8::FunctionTemplate> constructor_template;