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| <title>Untitled Document: Formats</title> |
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| <a name="Formats"></a> |
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| <a name="File-formats"></a> |
| <h3 class="section">2.9 File formats</h3> |
| <p>A format is a BFD concept of high level file contents type. The |
| formats supported by BFD are: |
| </p> |
| <ul> |
| <li> <code>bfd_object</code> |
| </li></ul> |
| <p>The BFD may contain data, symbols, relocations and debug info. |
| </p> |
| <ul> |
| <li> <code>bfd_archive</code> |
| </li></ul> |
| <p>The BFD contains other BFDs and an optional index. |
| </p> |
| <ul> |
| <li> <code>bfd_core</code> |
| </li></ul> |
| <p>The BFD contains the result of an executable core dump. |
| </p> |
| <a name="File-format-functions"></a> |
| <h4 class="subsection">2.9.1 File format functions</h4> |
| |
| |
| <a name="index-bfd_005fcheck_005fformat"></a> |
| <a name="bfd_005fcheck_005fformat"></a> |
| <h4 class="subsubsection">2.9.1.1 <code>bfd_check_format</code></h4> |
| <p><strong>Synopsis</strong> |
| </p><div class="example"> |
| <pre class="example">bfd_boolean bfd_check_format (bfd *abfd, bfd_format format); |
| </pre></div> |
| <p><strong>Description</strong><br> |
| Verify if the file attached to the BFD <var>abfd</var> is compatible |
| with the format <var>format</var> (i.e., one of <code>bfd_object</code>, |
| <code>bfd_archive</code> or <code>bfd_core</code>). |
| </p> |
| <p>If the BFD has been set to a specific target before the |
| call, only the named target and format combination is |
| checked. If the target has not been set, or has been set to |
| <code>default</code>, then all the known target backends is |
| interrogated to determine a match. If the default target |
| matches, it is used. If not, exactly one target must recognize |
| the file, or an error results. |
| </p> |
| <p>The function returns <code>TRUE</code> on success, otherwise <code>FALSE</code> |
| with one of the following error codes: |
| </p> |
| <ul> |
| <li> <code>bfd_error_invalid_operation</code> - |
| if <code>format</code> is not one of <code>bfd_object</code>, <code>bfd_archive</code> or |
| <code>bfd_core</code>. |
| |
| </li><li> <code>bfd_error_system_call</code> - |
| if an error occured during a read - even some file mismatches |
| can cause bfd_error_system_calls. |
| |
| </li><li> <code>file_not_recognised</code> - |
| none of the backends recognised the file format. |
| |
| </li><li> <code>bfd_error_file_ambiguously_recognized</code> - |
| more than one backend recognised the file format. |
| </li></ul> |
| |
| <a name="index-bfd_005fcheck_005fformat_005fmatches"></a> |
| <a name="bfd_005fcheck_005fformat_005fmatches"></a> |
| <h4 class="subsubsection">2.9.1.2 <code>bfd_check_format_matches</code></h4> |
| <p><strong>Synopsis</strong> |
| </p><div class="example"> |
| <pre class="example">bfd_boolean bfd_check_format_matches |
| (bfd *abfd, bfd_format format, char ***matching); |
| </pre></div> |
| <p><strong>Description</strong><br> |
| Like <code>bfd_check_format</code>, except when it returns FALSE with |
| <code>bfd_errno</code> set to <code>bfd_error_file_ambiguously_recognized</code>. In that |
| case, if <var>matching</var> is not NULL, it will be filled in with |
| a NULL-terminated list of the names of the formats that matched, |
| allocated with <code>malloc</code>. |
| Then the user may choose a format and try again. |
| </p> |
| <p>When done with the list that <var>matching</var> points to, the caller |
| should free it. |
| </p> |
| <a name="index-bfd_005fset_005fformat"></a> |
| <a name="bfd_005fset_005fformat"></a> |
| <h4 class="subsubsection">2.9.1.3 <code>bfd_set_format</code></h4> |
| <p><strong>Synopsis</strong> |
| </p><div class="example"> |
| <pre class="example">bfd_boolean bfd_set_format (bfd *abfd, bfd_format format); |
| </pre></div> |
| <p><strong>Description</strong><br> |
| This function sets the file format of the BFD <var>abfd</var> to the |
| format <var>format</var>. If the target set in the BFD does not |
| support the format requested, the format is invalid, or the BFD |
| is not open for writing, then an error occurs. |
| </p> |
| <a name="index-bfd_005fformat_005fstring"></a> |
| <a name="bfd_005fformat_005fstring"></a> |
| <h4 class="subsubsection">2.9.1.4 <code>bfd_format_string</code></h4> |
| <p><strong>Synopsis</strong> |
| </p><div class="example"> |
| <pre class="example">const char *bfd_format_string (bfd_format format); |
| </pre></div> |
| <p><strong>Description</strong><br> |
| Return a pointer to a const string |
| <code>invalid</code>, <code>object</code>, <code>archive</code>, <code>core</code>, or <code>unknown</code>, |
| depending upon the value of <var>format</var>. |
| </p> |
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