70 lines
4.5 KiB
HTML
70 lines
4.5 KiB
HTML
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<!DOCTYPE html>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>CLiki: nibbles</title>
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<link rel="alternate" type="application/atom+xml" title="ATOM feed of edits to current article"
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href="https://www.cliki.net/site/feed/article.atom?title=nibbles">
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<span class="hidden">CLiki - nibbles</span>
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<div id="content"><div id="content-area"><div id="article-title">nibbles</div><div id="article">Nibbles is a library for accessing octet-addressed blocks of data.<p>When dealing with network protocols and file formats, it's common to
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have to read or write 16-, 32-, or 64-bit datatypes in signed or
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unsigned flavors. Common Lisp sort of supports this by specifying
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:ELEMENT-TYPE for streams, but that facility is underspecified and
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there's nothing similar for read/write from octet vectors. What most
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people wind up doing is rolling their own small facility for their
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particular needs and calling it a day.<p>This library attempts to be comprehensive and centralize such
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facilities. Functions to read 16-, 32-, and 64-bit quantities from
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octet vectors in signed or unsigned flavors are provided; these
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functions are also SETFable. Since it's sometimes desirable to
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read/write directly from streams, functions for doing so are also
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provided. On some implementations, reading/writing IEEE singles/doubles
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(i.e. SINGLE-FLOAT and DOUBLE-FLOAT) will also be supported.<p>In addition to centralizing such facilities, NIBBLES also aspires to
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become a place where compiler optimizations can be written once and used
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everywhere. The intention is that (eventually):<p> (nibbles:sb32ref/le vector index)<p>will compile (with any necessary safety checks) to a MOVSX instruction
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on an x86oid processor in SBCL (or other implementations) if VECTOR and
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INDEX are of appropriate types.<p>I remember reading a post on comp.lang.lisp that suggested the designers
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of Common Lisp ignored the realities of octets and endianness and so
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forth. This library is a small step towards remedying that deficiency.<p>Homepage: <a href="https://github.com/sharplispers/nibbles">https://github.com/sharplispers/nibbles</a><p>License: <a href="BSD.html" class="category">BSD</a><p><hr>
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Topics: <a href="binary format.html" class="category">binary format</a> <a href="system programming.html" class="category">system programming</a></div></div>
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