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162 lines
6.0 KiB
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<html lang="en">
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<title>Formats - Untitled</title>
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<!--
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This file documents the BFD library.
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Copyright (C) 1991, 2000, 2001, 2003, 2006, 2007 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.1 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being ``GNU General Public License'' and ``Funding
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Free Software'', the Front-Cover texts being (a) (see below), and with
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the Back-Cover Texts being (b) (see below). A copy of the license is
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included in the section entitled ``GNU Free Documentation License''.
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development.-->
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</head>
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<body>
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<div class="node">
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<p>
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<a name="Formats"></a>Next: <a rel="next" accesskey="n" href="Relocations.html#Relocations">Relocations</a>,
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Previous: <a rel="previous" accesskey="p" href="Archives.html#Archives">Archives</a>,
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Up: <a rel="up" accesskey="u" href="BFD-front-end.html#BFD-front-end">BFD front end</a>
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<hr><br>
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</div>
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<h3 class="section">2.9 File formats</h3>
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<p>A format is a BFD concept of high level file contents type. The
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formats supported by BFD are:
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<ul>
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<li><code>bfd_object</code>
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</ul>
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The BFD may contain data, symbols, relocations and debug info.
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<ul>
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<li><code>bfd_archive</code>
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</ul>
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The BFD contains other BFDs and an optional index.
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<ul>
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<li><code>bfd_core</code>
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</ul>
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The BFD contains the result of an executable core dump.
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<h4 class="subsection">2.9.1 File format functions</h4>
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<p><a name="index-bfd_005fcheck_005fformat-76"></a>
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<h5 class="subsubsection">2.9.1.1 <code>bfd_check_format</code></h5>
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<p><strong>Synopsis</strong>
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<pre class="example"> bfd_boolean bfd_check_format (bfd *abfd, bfd_format format);
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</pre>
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<p><strong>Description</strong><br>
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Verify if the file attached to the BFD <var>abfd</var> is compatible
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with the format <var>format</var> (i.e., one of <code>bfd_object</code>,
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<code>bfd_archive</code> or <code>bfd_core</code>).
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<p>If the BFD has been set to a specific target before the
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call, only the named target and format combination is
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checked. If the target has not been set, or has been set to
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<code>default</code>, then all the known target backends is
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interrogated to determine a match. If the default target
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matches, it is used. If not, exactly one target must recognize
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the file, or an error results.
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<p>The function returns <code>TRUE</code> on success, otherwise <code>FALSE</code>
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with one of the following error codes:
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<ul>
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<li><code>bfd_error_invalid_operation</code> -
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if <code>format</code> is not one of <code>bfd_object</code>, <code>bfd_archive</code> or
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<code>bfd_core</code>.
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<li><code>bfd_error_system_call</code> -
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if an error occured during a read - even some file mismatches
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can cause bfd_error_system_calls.
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<li><code>file_not_recognised</code> -
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none of the backends recognised the file format.
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<li><code>bfd_error_file_ambiguously_recognized</code> -
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more than one backend recognised the file format.
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</ul>
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<p><a name="index-bfd_005fcheck_005fformat_005fmatches-77"></a>
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<h5 class="subsubsection">2.9.1.2 <code>bfd_check_format_matches</code></h5>
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<p><strong>Synopsis</strong>
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<pre class="example"> bfd_boolean bfd_check_format_matches
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(bfd *abfd, bfd_format format, char ***matching);
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</pre>
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<p><strong>Description</strong><br>
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Like <code>bfd_check_format</code>, except when it returns FALSE with
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<code>bfd_errno</code> set to <code>bfd_error_file_ambiguously_recognized</code>. In that
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case, if <var>matching</var> is not NULL, it will be filled in with
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a NULL-terminated list of the names of the formats that matched,
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allocated with <code>malloc</code>.
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Then the user may choose a format and try again.
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<p>When done with the list that <var>matching</var> points to, the caller
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should free it.
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<p><a name="index-bfd_005fset_005fformat-78"></a>
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<h5 class="subsubsection">2.9.1.3 <code>bfd_set_format</code></h5>
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<p><strong>Synopsis</strong>
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<pre class="example"> bfd_boolean bfd_set_format (bfd *abfd, bfd_format format);
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</pre>
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<p><strong>Description</strong><br>
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This function sets the file format of the BFD <var>abfd</var> to the
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format <var>format</var>. If the target set in the BFD does not
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support the format requested, the format is invalid, or the BFD
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is not open for writing, then an error occurs.
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<p><a name="index-bfd_005fformat_005fstring-79"></a>
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<h5 class="subsubsection">2.9.1.4 <code>bfd_format_string</code></h5>
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<p><strong>Synopsis</strong>
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<pre class="example"> const char *bfd_format_string (bfd_format format);
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</pre>
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<p><strong>Description</strong><br>
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Return a pointer to a const string
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<code>invalid</code>, <code>object</code>, <code>archive</code>, <code>core</code>, or <code>unknown</code>,
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depending upon the value of <var>format</var>.
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</body></html>
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