#ifndef SRC_NODE_BUFFER_H_

#define SRC_NODE_BUFFER_H_

#include "node.h"

#include "smalloc.h"

#include "v8.h"

#if defined(NODE_WANT_INTERNALS)

#include "env.h"

#endif // defined(NODE_WANT_INTERNALS)

namespace node {

namespace Buffer {

static const unsigned int kMaxLength = smalloc::kMaxLength;

NODE_EXTERN typedef void (*FreeCallback)(char* data, void* hint);

NODE_EXTERN bool HasInstance(v8::Handle<v8::Value> val);

NODE_EXTERN bool HasInstance(v8::Handle<v8::Object> val);

NODE_EXTERN char* Data(v8::Handle<v8::Value> val);

NODE_EXTERN char* Data(v8::Handle<v8::Object> val);

NODE_EXTERN size_t Length(v8::Handle<v8::Value> val);

NODE_EXTERN size_t Length(v8::Handle<v8::Object> val);

// public constructor - data is copied

NODE_EXTERN v8::MaybeLocal<v8::Object> Copy(v8::Isolate* isolate,

const char* data,

size_t len);

// public constructor

NODE_EXTERN v8::MaybeLocal<v8::Object> New(v8::Isolate* isolate, size_t length);

// public constructor from string

NODE_EXTERN v8::MaybeLocal<v8::Object> New(v8::Isolate* isolate,

v8::Handle<v8::String> string,

enum encoding enc = UTF8);

// public constructor - data is used, callback is passed data on object gc

NODE_EXTERN v8::MaybeLocal<v8::Object> New(v8::Isolate* isolate,

char* data,

size_t length,

FreeCallback callback,

void* hint);

// public constructor - data is used.

NODE_EXTERN v8::MaybeLocal<v8::Object> New(v8::Isolate* isolate,

char* data,

size_t len);

// This is verbose to be explicit with inline commenting

static inline bool IsWithinBounds(size_t off, size_t len, size_t max) {

// Asking to seek too far into the buffer

// check to avoid wrapping in subsequent subtraction

if (off > max)

return false;

// Asking for more than is left over in the buffer

if (max - off < len)

return false;

// Otherwise we're in bounds

return true;

}

// Internal. Not for public consumption. We can't define these in

// src/node_internals.h due to a circular dependency issue with

// the smalloc.h and node_internals.h headers.

#if defined(NODE_WANT_INTERNALS)

v8::MaybeLocal<v8::Object> New(Environment* env, size_t size);

v8::MaybeLocal<v8::Object> New(Environment* env, const char* data, size_t len);

v8::MaybeLocal<v8::Object> New(Environment* env,

char* data,

size_t length,

FreeCallback callback,

void* hint);

v8::MaybeLocal<v8::Object> Use(Environment* env, char* data, size_t length);

#endif // defined(NODE_WANT_INTERNALS)

} // namespace Buffer

} // namespace node

#endif // SRC_NODE_BUFFER_H_