How to use ref with node-ffi for calling C functions?

Ref complements node-ffi by handling pointer operations for buffers. Pass ref-typed buffers as arguments to ffi functions, as shown in examples, to enable direct memory access in native calls.

Ref vs node-bindings: which is better for native addons?

Ref is for memory manipulation within JavaScript, ideal for FFI and binary data, while node-bindings compiles C++ addons. Use ref for flexibility, node-bindings for performance-critical native modules.

How to handle structs in Node.js with ref?

Define custom types for each struct field using ref's type system, ensuring proper alignment and size. The Wiki has examples for known types, but it requires manual setup for complex layouts.

Can ref be used in Electron apps?

Yes, ref works in Electron since it's Node.js-based, but ensure native dependencies are compiled for the target platform and manage memory carefully across processes.

How to avoid memory leaks with ref?

Manage buffer lifecycles explicitly, dereference pointers when done, and avoid circular references. Native memory isn't tracked by JavaScript's garbage collector, so manual cleanup is crucial.

Is ref compatible with TypeScript?

Community type definitions exist on DefinitelyTyped, but native support is limited. Expect manual annotations and potential gaps in type safety for custom types.

Open-Awesome

ref

JavaScript

A Node.js library that extends Buffer instances with pointer-like capabilities for low-level memory operations.

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456 stars139 forks0 contributors

What is ref?

Ref is a Node.js library that transforms Buffer instances into pointer-like objects, enabling low-level memory operations such as dereferencing, address manipulation, and custom type handling. It solves the problem of interacting with native code and binary data by providing a JavaScript-friendly interface to memory pointers, similar to functionality found in C/C++.

Target Audience

Node.js developers working with native add-ons, foreign function interfaces (FFI), binary protocols, or low-level memory manipulation, such as those building bindings to C libraries or processing complex binary data structures.

Value Proposition

Developers choose Ref for its performance-focused design using Node's Buffers, extensible type system for custom memory layouts, and comprehensive pointer operations that simplify integration with native code without sacrificing JavaScript ergonomics.

Overview

Turn Buffer instances into "pointers"

Use Cases

Best For

Creating native bindings to C libraries using FFI in Node.js
Implementing custom binary protocols with pointer-like memory access
Handling 64-bit integer data in Buffers for cross-platform compatibility
Building memory-efficient data structures that require address referencing
Debugging or inspecting memory layouts in Node.js applications
Extending Buffer capabilities for low-level systems programming tasks

Not Ideal For

Web applications focused solely on front-end UI without native system integration
Projects prioritizing rapid prototyping with high-level abstractions over low-level control
Teams unfamiliar with C-style pointer semantics or systems programming
Environments where memory safety is critical and manual manipulation poses unacceptable risks

Pros & Cons

Pros

Performance-Oriented Design

Uses Node's fast Buffer instances instead of slower C++ alternatives, as emphasized in the Philosophy section, ensuring efficient memory operations.

Extensible Type System

Allows defining custom types with get/set functions, enabling automatic dereferencing and type-safe memory access, as shown in the type interface examples.

Native Code Compatibility

Provides NULL pointer representation and handles int64_t/uint64_t values, essential for seamless interaction with C libraries and binary protocols.

Pointer Chain Support

Enables reading and writing buffer addresses to other buffers, facilitating multi-level indirection and complex data structures, demonstrated in dereferencing examples.

Cons

Steep Learning Curve

Requires deep understanding of pointer semantics and low-level memory management, which can be daunting for JavaScript developers used to higher-level abstractions.

Risk of Memory Errors

Direct memory manipulation increases the likelihood of segmentation faults or corruption, similar to C programming, without built-in safety mechanisms.

Limited Ecosystem Integration

Has fewer community tools and high-level wrappers compared to mainstream Node.js libraries, potentially increasing development time for complex integrations.

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