Cosmopolitan Libc

Zstandard, or zstd, is a fast lossless compression algorithm designed for real-time scenarios. It aims to provide zlib-level compression ratios with significantly better performance. It is backed by the fast entropy stage provided by the Huff0 and FSE library.

Key characteristics:

• Stable Format: Documented in [RFC8878].
• Versatile CLI: The command line utility can produce and decode .zst, .gz, .xz, and .lz4 files.
• Performance Trade-offs: Users can configure the speed vs. compression ratio trade-off. Negative compression levels (e.g., --fast=#) offer higher speeds at the cost of ratio, while higher positive levels offer better ratios at the cost of speed. Decompression speed remains relatively constant across settings.

redbean is a single-file distributable web server that functions as an 'Actually Portable Executable' (APE) PKZIP archive. It allows you to package your web application and all its static assets into a single executable file that runs offline.

Key characteristics:

• High Performance: Can serve over 1 million gzip-encoded responses per second.
• Embedded Languages: Includes Lua v5.4 and SQLite 3.35.5 for dynamic page generation.
• Cross-Platform: Runs on Linux, Windows, Mac, FreeBSD, OpenBSD, and NetBSD.
• Protocol Polyglot: Serves both HTTP and HTTPS on the same port numbers.

PL_MPEG is a single-file, MIT-licensed C/C++ library designed for simple video playback integration. It provides an MPEG1 Video decoder, an MP2 Audio decoder, and an MPEG-PS demuxer. It is intended as a lightweight alternative to heavy libraries like FFmpeg for use in apps or games.

Key characteristics:

• No SIMD dependency: It does not use SIMD instructions, making it highly portable.
• Performance: Despite the lack of SIMD, it is capable of decoding 4k60fps video on a single CPU core.
• Patent-free: Uses MPEG1 and MP2 codecs, all of which are patent-free.

plinko is a simple Lisp interpreter designed for high performance through the use of advanced and unconventional operating system features. It leverages low-level hardware and OS capabilities—such as the popcount instruction for mark-sweep garbage collection, memory overcommit, and segment registers—to gain a performance edge while maintaining a simple implementation.

While it is an interpreted language, it demonstrates competitive performance in specific benchmarks (like binary tree operations) compared to other interpreted languages like Python or Racket, and even competes with native JIT-compiled implementations like SBCL in certain simulated arithmetic scenarios.

Hiredis is a minimalistic C client library for the Redis database. It provides support for the binary-safe Redis protocol (compatible with Redis version >= 1.2.0).

The library is designed with three distinct APIs:

1. Synchronous API: For blocking operations.
2. Asynchronous API: For non-blocking operations.
3. Reply Parsing API: A decoupled stream parser designed for easy reusability, which can be used in higher-level language bindings for efficient reply parsing.

chibicc is a small C compiler that implements most C11 features. While categorized as a "toy compiler," it is capable of compiling real-world programs such as Git, SQLite, and libpng, and passing their respective test suites without modifications to the source code.

Key characteristics:

• C11 Support: Includes features like preprocessor, long double (x87 80-bit), bit-fields, alloca(), variable-length arrays, thread-local variables, atomic variables, common symbols, designated initializers, and various string literal types (L, u, U, u8).
• No Optimization: The compiler does not currently have an optimization pass; it emits unoptimized assembly that may be significantly slower than GCC.
• Limitations: It does not support digraphs, trigraphs, complex numbers, K&R-style function prototypes, or inline assembly.

Because email messages are primarily text, the model stores all text data as Unicode strings. To handle real-world scenarios where messages contain badly formatted or non-ASCII characters (un-decodable binary), the package uses the surrogateescape error handler of the ASCII codec.

This allows the package to "carry" un-decodable binary data through the model from the Parser to the Generator without losing information.

• Parsing: The Parser performs surrogateescape encoding on binary input.
• Retrieval: Most public interfaces convert this data into a safe form or bytes, but the internal API preserves the surrogateescaped bytes to ensure they can be regenerated exactly during the output stage.