114 lines
5.4 KiB
HTML
114 lines
5.4 KiB
HTML
<!DOCTYPE html>
|
|
<html>
|
|
<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<!-- This manual documents Guile version 3.0.10.
|
|
|
|
Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
|
|
Inc.
|
|
|
|
Copyright (C) 2021 Maxime Devos
|
|
|
|
Copyright (C) 2024 Tomas Volf
|
|
|
|
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
|
any later version published by the Free Software Foundation; with no
|
|
Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
|
|
copy of the license is included in the section entitled "GNU Free
|
|
Documentation License." -->
|
|
<title>Bytevectors (Guile Reference Manual)</title>
|
|
|
|
<meta name="description" content="Bytevectors (Guile Reference Manual)">
|
|
<meta name="keywords" content="Bytevectors (Guile Reference Manual)">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content=".texi2any-real">
|
|
<meta name="viewport" content="width=device-width,initial-scale=1">
|
|
|
|
<link href="index.html" rel="start" title="Top">
|
|
<link href="Concept-Index.html" rel="index" title="Concept Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="Data-Types.html" rel="up" title="Data Types">
|
|
<link href="Arrays.html" rel="next" title="Arrays">
|
|
<link href="Bit-Vectors.html" rel="prev" title="Bit Vectors">
|
|
<style type="text/css">
|
|
<!--
|
|
a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em}
|
|
div.example {margin-left: 3.2em}
|
|
span:hover a.copiable-link {visibility: visible}
|
|
-->
|
|
</style>
|
|
<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<div class="subsection-level-extent" id="Bytevectors">
|
|
<div class="nav-panel">
|
|
<p>
|
|
Next: <a href="Arrays.html" accesskey="n" rel="next">Arrays</a>, Previous: <a href="Bit-Vectors.html" accesskey="p" rel="prev">Bit Vectors</a>, Up: <a href="Data-Types.html" accesskey="u" rel="up">Data Types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
<hr>
|
|
<h4 class="subsection" id="Bytevectors-1"><span>6.6.12 Bytevectors<a class="copiable-link" href="#Bytevectors-1"> ¶</a></span></h4>
|
|
|
|
<a class="index-entry-id" id="index-bytevector"></a>
|
|
<a class="index-entry-id" id="index-R6RS"></a>
|
|
|
|
<p>A <em class="dfn">bytevector</em> is a raw byte string. The <code class="code">(rnrs bytevectors)</code>
|
|
module provides the programming interface specified by the
|
|
<a class="uref" href="http://www.r6rs.org/">Revised^6 Report on the Algorithmic Language
|
|
Scheme (R6RS)</a>. It contains procedures to manipulate bytevectors and
|
|
interpret their contents in a number of ways: as signed or unsigned
|
|
integer of various sizes and endianness, as IEEE-754 floating point
|
|
numbers, or as strings. It is a useful tool to encode and decode binary
|
|
data. The <a class="ref" href="R7RS-Support.html">R7RS</a> offers its own set of bytevector
|
|
procedures (see <a class="pxref" href="Bytevector-Procedures-in-R7RS.html">Bytevector Procedures in R7RS</a>).
|
|
</p>
|
|
<p>The R6RS (Section 4.3.4) specifies an external representation for
|
|
bytevectors, whereby the octets (integers in the range 0–255) contained
|
|
in the bytevector are represented as a list prefixed by <code class="code">#vu8</code>:
|
|
</p>
|
|
<div class="example lisp">
|
|
<pre class="lisp-preformatted">#vu8(1 53 204)
|
|
</pre></div>
|
|
|
|
<p>denotes a 3-byte bytevector containing the octets 1, 53, and 204. Like
|
|
string literals, booleans, etc., bytevectors are “self-quoting”, i.e.,
|
|
they do not need to be quoted:
|
|
</p>
|
|
<div class="example lisp">
|
|
<pre class="lisp-preformatted">#vu8(1 53 204)
|
|
⇒ #vu8(1 53 204)
|
|
</pre></div>
|
|
|
|
<p>Bytevectors can be used with the binary input/output primitives
|
|
(see <a class="pxref" href="Binary-I_002fO.html">Binary I/O</a>).
|
|
</p>
|
|
|
|
<ul class="mini-toc">
|
|
<li><a href="Bytevector-Endianness.html" accesskey="1">Endianness</a></li>
|
|
<li><a href="Bytevector-Manipulation.html" accesskey="2">Manipulating Bytevectors</a></li>
|
|
<li><a href="Bytevectors-as-Integers.html" accesskey="3">Interpreting Bytevector Contents as Integers</a></li>
|
|
<li><a href="Bytevectors-and-Integer-Lists.html" accesskey="4">Converting Bytevectors to/from Integer Lists</a></li>
|
|
<li><a href="Bytevectors-as-Floats.html" accesskey="5">Interpreting Bytevector Contents as Floating Point Numbers</a></li>
|
|
<li><a href="Bytevectors-as-Strings.html" accesskey="6">Interpreting Bytevector Contents as Unicode Strings</a></li>
|
|
<li><a href="Bytevectors-as-Arrays.html" accesskey="7">Accessing Bytevectors with the Array API</a></li>
|
|
<li><a href="Bytevectors-as-Uniform-Vectors.html" accesskey="8">Accessing Bytevectors with the SRFI-4 API</a></li>
|
|
<li><a href="Bytevector-Procedures-in-R7RS.html" accesskey="9">Bytevector Procedures in R7RS</a></li>
|
|
<li><a href="Bytevector-Slices.html">Bytevector Slices</a></li>
|
|
</ul>
|
|
</div>
|
|
<hr>
|
|
<div class="nav-panel">
|
|
<p>
|
|
Next: <a href="Arrays.html">Arrays</a>, Previous: <a href="Bit-Vectors.html">Bit Vectors</a>, Up: <a href="Data-Types.html">Data Types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|