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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> &nbsp; [<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>
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<h4 class="subsection" id="Bytevectors-1"><span>6.6.12 Bytevectors<a class="copiable-link" href="#Bytevectors-1"> &para;</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&ndash;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 &ldquo;self-quoting&rdquo;, i.e.,
they do not need to be quoted:
</p>
<div class="example lisp">
<pre class="lisp-preformatted">#vu8(1 53 204)
&rArr; #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>
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