Version history

Koffi 2

Koffi 2.11

Koffi 2.11.0

Released on 2025-04-09

• Add koffi.view() to access memory without copy
• Various documentation fixes and improvements

Koffi 2.10

Koffi 2.10.1

Released on 2025-01-24

• Fix detection of ARM32 in build script in some cases
• Fix wrong path for ARM32 prebuild

Koffi 2.10.0

Released on 2024-12-22

• Allow redefinition of opaque types to concrete struct or union
• Clear out executable stack bit from ELF targets (-z noexecstack)
• Update documentation style

Koffi 2.9

Koffi 2.9.2

Released on 2024-11-08

• Fix non-aligned pointers when pushing UTF-16 and UTF-32 string parameters
• Various documentation fixes and improvements

Koffi 2.9.1

Released on 2024-09-23

• Fix x86 32-bit support regression in 2.9.0
• Add missing TS definition for koffi.alloc()
• Support koffi.load(null) in TS definition file

Koffi 2.9.0

Released on 2024-07-22

• Add support for char32_t and wchar_t (wide) strings
• Include Linux/musl x64 prebuild (based on Alpine)

Koffi 2.8

Koffi 2.8.11

Released on 2024-06-19

• Work around MSVC compiler bug introduced in Visual Studio 17.10

Koffi 2.8.9

Released on 2024-05-17

• Fix ABI issue regarding bool return values on x86_64 (and possibly other platforms)

Koffi 2.8.8

Released on 2024-04-26

• Support use of buffers with mismatched size (truncation or zero-filling)

Koffi 2.8.7

Released on 2024-04-23

• Improve compatibility with SEHOP on Windows (@longhun12346)

Koffi 2.8.6

Released on 2024-04-12

• Support loading library with RTLD_DEEPBIND where supported

Koffi 2.8.5

Released on 2024-04-11

• Prevent obviously invalid type and member names
• Fix possible infinite loop / UB for koffi.load() errors on POSIX systems
• Fix null return value instead of exception for some errors in koffi.load() on Windows

Koffi 2.8.4

Released on 2024-04-09

• Use simpler workaround for Node 20.12+ and 21.6+ to avoid excessive memory use

Koffi 2.8.2

Released on 2024-04-07

• Support loading library with RTLD_GLOBAL on POSIX platforms

Koffi 2.8.1

Released on 2024-04-04

• Fix incompatibility with Node 20.12+ and 21.6+

Koffi 2.8.0

Released on 2024-02-12

• Support pushing pointers for string arguments
• Add koffi.alloc() for stable pointers

Koffi 2.7

Koffi 2.7.4

Released on 2024-02-04

• Support callbacks happening on main thread but outside JS call (such as during event loop)
• Improve stability after koffi.reset()
• Expose internal Node/NAPI env pointer
• Name main Koffi API functions

Koffi 2.7.3

Released on 2024-01-26

• Support decoding NULL terminated arrays

Koffi 2.7.2

Released on 2024-01-15

• Add missing TypeScript declaration for koffi.free()
• Fix TypeScript declaration of koffi.encode()
• Try to improve compatibility with webpack

Koffi 2.7.1

Released on 2024-01-02

• Support C-like int[3] syntax for fixed array types
• Refuse type specifiers with invalid tokens at the end (previously ignored)

Koffi 2.7.0

Released on 2023-12-21

• Support alternative callback calling convention in classic syntax
• Change syntax for calling conventions with classic syntax
• Drop unused "internal" property from Koffi

Koffi 2.6

Koffi 2.6.12

Released on 2023-12-11

• Fix possible crash introduced in Koffi 2.6.11

Koffi 2.6.11

Released on 2023-12-05

• Speed up resolving simple and often used type names
• Fix use of optional length argument with koffi.encode()

Koffi 2.6.10

Released on 2023-11-29

• Protect GetLastError() value from Node.js and V8 on Windows

Koffi 2.6.9

Released on 2023-11-25

• Search in DLL directory for additional dependencies on Windows
• Ignore prototype properties when making structs or unions
• Show detected version of Node when not adequate
• Minor documentation fixes

Koffi 2.6.6

Released on 2023-10-28

• Better handle errors while making struct or union types

Koffi 2.6.5

Released on 2023-10-28

• Allow self-referential structs and unions
• Fix rare Node.js "FATAL ERROR" with some invalid type specifiers

Koffi 2.6.4

Released on 2023-10-26

• Fix build issue with recent Visual Studio versions

Koffi 2.6.3

Released on 2023-10-17

• Add indirect loading script to help some bundlers

Koffi 2.6.1

Released on 2023-09-18

• Support string direction qualifiers in classic function definitions
• Fix possible off-by-one array access when parsing type name

Koffi 2.6.0

Released on 2023-09-13

New features:

• Use koffi.symbol() to make pointers to exported variables (or other symbols)
• Use koffi.encode() to explictly encode data from JS to C memory
• Use shared library lazy-loading (RTLD_LAZY) on POSIX platforms

Other changes:

• Print more helpful error for Win32/Win64 DLL mismatches
• Add missing 'Union' primitive value in TS definition file

Koffi 2.5

Koffi 2.5.20

Released on 2023-08-31

• Fix possible crash with async registered callbacks introduced in Koffi 2.5.19
• Various documentation fixes and improvements

Koffi 2.5.19

Released on 2023-08-29

• Create thread-safe function broker lazily
• Add koffi.reset() for type names and async broker

Koffi 2.5.18

Released on 2023-08-27

• Fix compatibility with Electron

Koffi 2.5.16

Released on 2023-08-25

• Run Koffi tests through usual index.js entry point
• Fix DLL error when using Koffi from NW.js on Windows
• Simplify NW.js Koffi example

Koffi 2.5.12

Released on 2023-08-21

• Fix native module bundling for FreeBSD ARM64 and Linux RISC-V 64
• Increase maximum number of parameters to 64

Koffi 2.5.11

Released on 2023-08-03

• Support casting function pointers with koffi.as()
• Build in C++20 mode

Koffi 2.5.10

Released on 2023-08-01

• Fix CMake regression when client has to build Koffi

Koffi 2.5.9

Released on 2023-07-28

Main changes:

• Use bundler-friendly static require calls in Koffi
• Add packaging examples to documentation

Other changes:

• Add missing unload() export to TS file
• Add export for koffi.types in TS file

Koffi 2.5.8

Released on 2023-07-26

• Add more search paths for native Koffi modules
• Add section about bundling to documentation

Koffi 2.5.7

Released on 2023-07-19

• Point package to new repository

Koffi 2.5.6

Released on 2023-07-19

• Increase limit of output parameters from 16 to 32

Koffi 2.5.5

Released on 2023-07-17

• Support decoding non-char null-terminated arrays

Koffi 2.5.4

Released on 2023-07-14

• Fix koffi.pointer() not accepting disposable types
• Fix potential issues when making pointers to anonymous types

Koffi 2.5.3

Released on 2023-07-05

• Add missing union exports in TS definition file
• Fix some parameter names in TS definition file

Koffi 2.5.2

Released on 2023-07-04

• Default initialize unset object/struct members

Koffi 2.5.1

Released on 2023-06-20

• Fix crash with some struct types in System V 64 ABI
• Always use direct passthrough for buffer arguments

Koffi 2.5.0

Released on 2023-06-20

New features:

• Support union types

Other fixes:

• Fix ABI for single-float aggregate return on i386 BSD systems
• Don't mess with Node.js signal handling on POSIX systems

Koffi 2.4

Koffi 2.4.2

Released on 2023-06-04

• Support calling variadic function pointers
• Add documentation for function pointers

Koffi 2.4.1

Released on 2023-06-03

Main changes:

• Support decoding function pointers to callable functions
• Support calling function pointers with koffi.call()
• Deprecate koffi.callback in favor of koffi.proto

Other changes:

• Increase maximum number of callbacks to 8192
• Build Koffi with static CRT on Windows
• Reorganize Koffi data conversion documentation
• Add deprecated koffi.handle to TS file

Koffi 2.3

Koffi 2.3.20

Released on 2023-05-15

• Support explicit library unloading with lib.unload()

Koffi 2.3.19

Released on 2023-04-21

• Actually allow non-ambiguous [string] values for void * arguments

Koffi 2.3.18

Released on 2023-04-21

• Fix possible crash on exit caused by unregistered callbacks

Koffi 2.3.17

Released on 2023-04-20

• Allow strings for input void *, int8_t * and int16_t * pointer arguments
• Support using [string] (single-element string arrays) for polymorphic input/output arguments

Koffi 2.3.16

Released on 2023-04-11

• Fix Windows ARM64 build to work with official Node.js version
• Compile Windows builds with Visual Studio 2022 17.5.3
• Support null in koffi.free() and koffi.address()

Koffi 2.3.15

Released on 2023-04-10

• Improve manual decoding of 0-terminated strings
• Add checks around array conversion hints

Koffi 2.3.14

Released on 2023-04-05

• Add koffi.errno() function to get and set current errno value
• Add koffi.os.errno object with valid errno codes

Koffi 2.3.13

Released on 2023-03-30

• Add koffi.address() to get the raw value of a wrapper pointer

Koffi 2.3.12

Released on 2023-03-30

• Fix broken syntax in TS definition file
• Add missing exported properties in TS file

Koffi 2.3.11

Released on 2023-03-30

Main changes:

• Allow numbers and BigInts to be used for pointer arguments

Other changes:

• Use SQLITE_TRANSIENT in SQLite test code
• Avoid using statx() to allow compilation with glibc < 2.28
• Reorganize NPM package files to be less convoluted

Koffi 2.3.9

Released on 2023-03-10

• Relicense under MIT license

Koffi 2.3.8

Released on 2023-02-28

• Disable non-ready union support
• Simplify Windows stack allocation and drop NOACCESS and GUARD pages
• Adjust Windows TEB SEH chain and GuaranteedStackBytes for Koffi calls

Koffi 2.3.7

Released on 2023-02-27

• Fix missing require in index.js (@gastonFrecceroNapse)
• Reduce NPM package bloat (from 65 MB to 20 MB) caused by changes in 2.3.6

Koffi 2.3.6

Released on 2023-02-26

• Fix broken TS definition file
• Keep all prebuilt binaries and load correct one at runtime

Koffi 2.3.5

Released on 2023-02-24

Main fixes:

• Fix rare random crashes with async callbacks
• Fix some bugs with RISC-V 64 ABI

Other changes:

• Expose array type hint in koffi.introspect()
• Add missing koffi.array() export in TS definition
• Make KoffiFunction more flexible in TS definition (@insraq)
• Add a KoffiFunc helper type in TS typing (@insraq)
• Mark optional properties in TS TypeInfo class
• Minor performance improvements

Koffi 2.3.4

Released on 2023-01-31

• Fix error when installing Koffi on Windows (2.3.2)

Koffi 2.3.2

Released on 2023-01-30

Main changes:

• Fix type parser issues (such as ignoring some disposable qualifiers)
• Fix crash when using disposable types in output parameters
• Add basic koffi.stats() interface

Other changes:

• Avoid CNoke dependency
• Clear out development dependencies from package.json

Koffi 2.3.1

Released on 2023-01-30

• Error out when trying to use ambiguous void * arguments (input and/or output)
• Adjust TypeScript definitions (@insraq)
• Fix possible crash when parsing invalid prototype

Koffi 2.3.0

Released on 2023-01-25

Main changes:

• Allow buffers (TypedArray or ArrayBuffer) values for input and/or output pointer arguments (for polymorphic arguments)
• Support opaque buffers (TypedArray or ArrayBuffer) values in koffi.decode() to decode output buffers
• Decode non-string types as arrays when an explicit length is passed to koffi.decode()

Other changes:

• Drop TypedArray type check for array and pointer values (only the size matters)
• Allow ArrayBuffer everywhere TypedArray is supported
• Add TypeScript definition for Koffi (@insraq)
• Improve documentation about opaque and polymorphic structs
• Improve documentation for koffi.decode()
• Reduce NPM package size (from 100 MB to 25 MB) by removing test code and dependencies

Koffi 2.2

Koffi 2.2.5

Released on 2023-01-23

• Relicense Koffi under LGPL 3.0

Koffi 2.2.4

Released on 2023-01-19

• Fix memory leak on Windows (in Koffi 2.2.3) when running many async calls
• Reorganize documentation pages

Koffi 2.2.3

Released on 2023-01-17

• Support native code that uses Structured Exception Handling (SEH) on Windows (x86, x64 and ARM64)
• Try to use ebp/rbp as frame pointer in x86/x64 ASM code

Koffi 2.2.2

Released on 2023-01-14

Main fixes:

• Support transparent asynchronous callbacks
• Expand from a maximum of 16+16 to 1024 callbacks running in parallel

Other fixes:

• Fix bundler support by removing shebang from index.js
• Fix bugs when loading Koffi multiples times in same process (context aware module)
• Check N-API version when module is loaded
• Optimize callback unregistration

Koffi 2.2.1

Released on 2022-12-21

• Fix crash when calling callback again after FFI call inside previous callback

Koffi 2.2.0

Released on 2022-12-20

New features:

• Add koffi.decode() for callback pointer arguments
• Support transparent output string parameters
• Add koffi.offsetof() utility function
• Support optional this binding in koffi.register()

Other fixes:

• Correctly validate output parameter types
• Fix assertion with void * parameters

Koffi 2.1

Koffi 2.1.5

Released on 2022-11-27

• Add missing README file to NPM package

Koffi 2.1.4

Released on 2022-11-25

Main changes:

• Increase maximum type size from 32 kiB to 64 MiB
• Add configurable option for maximum type size

Other changes:

• Moved Koffi to a new repository: https://codeberg.org/Koromix/rygel/

Koffi 2.1.3

Released on 2022-10-31

• Support up to 16 output parameters (instead of 8)

Koffi 2.1.2

Released on 2022-10-31

• Support up to 8 output parameters (instead of 4)

Koffi 2.1.1

Released on 2022-08-16

• Fix potential memory allocation bugs

Koffi 2.1.0

Released on 2022-08-13

Main changes:

• Add koffi.as() to support polymorphic APIs based on void * parameters
• Add endian-sensitive integer types: intX_le_t, intX_be_t, uintX_le_t, uintX_be_t
• Accept typed arrays for void * parameters
• Introduce koffi.opaque() to replace koffi.handle() (which remains supported until Koffi 3.0)
• Support JS Array and TypedArray to fill struct and array pointer members

Other changes:

• Improve global performance with inlining and unity builds
• Add size_t primitive type
• Support member-specific alignement values in structs
• Detect impossible parameter and return types (such as non-pointer opaque types)
• Various documentation fixes and improvements

Koffi 2.0

Koffi 2.0.1

Released on 2022-07-30

• Return undefined (instead of null) for void functions

Koffi 2.0.0

Released on 2022-07-29

Major new features:

• Add disposable types for automatic disposal of C values (such as heap-allocated strings)
• Add support for registered callbacks, that can be called after the initial FFI call
• Support named pointer types
• Support complex type specifications outside of prototype parser

Minor new features:

• Support type aliases with koffi.alias()
• Add koffi.resolve() to resolve type strings
• Expose all primitive type aliases in koffi.types
• Correctly pass exceptions thrown in JS callbacks

Breaking API changes:

• Change handling of callback types, which must be used through pointers
• Change handling of opaque handles, which must be used through pointers
• Support all types in koffi.introspect(type)

Consult the migration guide for more information.

Koffi 1

Koffi 1.3

Koffi 1.3.12

Released on 2022-07-27

• Fix support for Yarn package manager

Koffi 1.3.11

Released on 2022-07-26

• Fix broken parsing of void * when used for first parameter

Koffi 1.3.10

Released on 2022-07-25

Main fixes:

• Fix support for callbacks with more than 4 parameters on Windows x64
• Fix support for callbacks with multiple floating-point arguments on ARM32 platforms
• Fix possibly incorrect conversion for uint32_t callback parameters

Other changes:

• Various documentation fixes and improvements

Koffi 1.3.9

Released on 2022-07-15

• Fix prebuild compatibility with Electron on Windows x64

Koffi 1.3.8

Released on 2022-07-12

Main changes:

• Prevent callback reuse beyond FFI call
• Add BTI support for AAarch64 platforms (except Windows)

Other changes:

• Fix and harmonize a few error messages

Koffi 1.3.7

Released on 2022-07-07

Main fixes:

• Fix crash when using callbacks inside structs
• Support for null strings in record members

Other changes:

• Add intptr_t and uintptr_t primitive types
• Add str/str16 type aliases for string/string16
• Various documentation fixes and improvements

Koffi 1.3.6

Released on 2022-07-01

Main fixes:

• Fix install error with Node < 15 on Windows (build system bug)

Other changes:

• Detect incompatible Node.js versions when installing Koffi
• Prebuild with Clang for Windows x64 and Linux x64 binaries
• Various documentation improvements

Koffi 1.3.5

Released on 2022-06-25

Main changes:

• Fix memory leak when many async calls are running
• Add configurable limit for maximum number of async calls (max_async_calls)

Other changes:

• Reduce default async memory stack and heap size
• Various documentation improvements

Koffi 1.3.4

Released on 2022-06-24

• Fix possible OpenBSD i386 crash with (void) functions

Koffi 1.3.3

Released on 2022-06-24

Main fixes:

• Fix misconversion of signed integer return value as unsigned

Other changes:

• Support (void) (empty) function signatures
• Disable unsafe compiler optimizations
• Various documentation improvements

Koffi 1.3.2

Released on 2022-06-23

• Support compilation in C++14 mode (graceful degradation)
• Support older toolchains on Linux (tested on Debian 9)

Koffi 1.3.1

Released on 2022-06-22

• The prebuilt binary is tested when Koffi is installed, and a rebuild happens if it fails to load

Koffi 1.3.0

Released on 2022-06-22

Major changes:

• Expand and move documentation to https://koffi.dev/
• Support JS arrays and TypedArrays for pointer arguments (input, output and mixed)

Other changes:

• Convert NULL string pointers to null instead of crashing (return values, struct and array members, callbacks)
• Default to 'string' array hint for char, char16 and char16_t arrays
• Fix definition of long types on Windows x64 (LLP64 model)
• Restrict automatic string conversion to signed char types
• Detect floating-point ABI before using prebuilt binaries (ARM32, RISC-V)
• Forbid duplicate member names in struct types

Koffi 1.2

Koffi 1.2.4

Released on 2022-06-12

• Windows ARM64 is now supported

Koffi 1.2.3

Released on 2022-06-11

• A prebuilt binary for macOS ARM64 (M1) is now included

Koffi 1.2.1

Released on 2022-06-11

This entry documents changes since version 1.1.0.

New features:

• JS functions can be used as C callbacks (cdecl, stdcall) on all platforms
• RISC-V 64 LP64D ABI is supported (LP64 is untested)
• Expose settings for memory usage of synchronous and asynchronous calls
• Transparent conversion between C buffers and strings
• Tentative support for Windows ARM64 (untested)

Main fixes:

• Fix excessive stack alignment of structs on x86 platforms
• Fix potential problems with big int64_t/uint64_t values
• Fix possible struct layout errors in push/pop code
• Fix alignment issues in ARM32 push code
• Fix incomplete/buggy support for HFA structs on ARM32 and ARM64
• Fix crashes on OpenBSD caused by missing MAP_STACK flag
• Fix non-sense "duplicate array type" errors
• Fix value koffi.internal to false in module (normal) builds
• Make sure we have a redzone below the stack for all architectures
• Use slower allocation for big objects instead of failing

Todo list

The following features and improvements are planned, not necessarily in that order:

• Port Koffi to Loong64 ISA and ABI
• Port Koffi to PowerPC (POWER9+) ISA and ABI
• Optimize passing of structs and arrays (with auto-generated JS)
• Automate Windows/AArch64 (qemu) and macOS/AArch64 (how? ... thanks Apple) tests
• Create a real-world example, using several libraries (Raylib, SQLite, libsodium) to illustrate various C API styles
• Add simple struct type parser
• Fix assembly unwind and CFI directives for better debugging experience