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<?xml version="1.0" encoding="UTF-8"?>
<refentry id="scupdatebinary">
<refentryinfo><title>OpenSC API Reference</title></refentryinfo>
<refmeta>
<refentrytitle>sc_update_binary</refentrytitle>
<manvolnum>3</manvolnum>
<refmiscinfo>opensc</refmiscinfo>
</refmeta>
<refnamediv>
<refname>sc_update_binary</refname>
<refpurpose>Write to an existing file</refpurpose>
</refnamediv>
<refsect1>
<title>Synopsis</title>
<para>
<programlisting>
#include <opensc.h>
int sc_update_binary(struct sc_card *card, unsigned int offset,
const unsigned char *buf, size_t count,
unsigned long flags);
</programlisting>
</para>
</refsect1>
<refsect1>
<title>Description</title>
<para>
This function writes <emphasis>count</emphasis> bytes from the buffer pointed to by
<emphasis>buf</emphasis> to a transparent elementary file (EF) on <emphasis>card</emphasis>. It
corresponds to the <link linkend="iso7816">ISO 7816</link> UPDATE BINARY function. Call <link
linkend="scselectfile">sc_select_file()</link> first to select the file to write to.
</para>
<para>
This function can only be used to write to a file region previously written to. For writing to a
newly created file, or a new region of an existing file, use <link
linkend="scwritebinary">sc_write_binary()</link>.
</para>
<para>
The <emphasis>offset</emphasis> argument specifies the file offset in bytes. The
<emphasis>flags</emphasis> argument is currently not used, and should be set to 0.
</para>
</refsect1>
<refsect1>
<title>Return value</title>
<para>
If successful, the number of bytes written is returned. Otherwise, a negative value is
returned.
</para>
</refsect1>
</refentry>
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