109 lines
3.1 KiB
Plaintext
109 lines
3.1 KiB
Plaintext
@section File formats
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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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@itemize @bullet
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@item
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@code{bfd_object}
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@end itemize
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The BFD may contain data, symbols, relocations and debug info.
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@itemize @bullet
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@item
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@code{bfd_archive}
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@end itemize
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The BFD contains other BFDs and an optional index.
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@itemize @bullet
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@item
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@code{bfd_core}
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@end itemize
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The BFD contains the result of an executable core dump.
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@findex bfd_check_format
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@subsubsection @code{bfd_check_format}
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@strong{Synopsis}
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@example
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boolean bfd_check_format(bfd *abfd, bfd_format format);
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@end example
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@strong{Description}@*
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Verify if the file attached to the BFD @var{abfd} is compatible
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with the format @var{format} (i.e., one of @code{bfd_object},
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@code{bfd_archive} or @code{bfd_core}).
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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}, 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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The function returns @code{true} on success, otherwise @code{false}
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with one of the following error codes:
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@itemize @bullet
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@item
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@code{bfd_error_invalid_operation} -
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if @code{format} is not one of @code{bfd_object}, @code{bfd_archive} or
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@code{bfd_core}.
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@item
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@code{bfd_error_system_call} -
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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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@item
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@code{file_not_recognised} -
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none of the backends recognised the file format.
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@item
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@code{bfd_error_file_ambiguously_recognized} -
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more than one backend recognised the file format.
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@end itemize
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@findex bfd_check_format_matches
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@subsubsection @code{bfd_check_format_matches}
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@strong{Synopsis}
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@example
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boolean bfd_check_format_matches(bfd *abfd, bfd_format format, char ***matching);
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@end example
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@strong{Description}@*
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Like @code{bfd_check_format}, except when it returns false with
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@code{bfd_errno} set to @code{bfd_error_file_ambiguously_recognized}. In that
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case, if @var{matching} 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}.
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Then the user may choose a format and try again.
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When done with the list that @var{matching} points to, the caller
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should free it.
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@findex bfd_set_format
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@subsubsection @code{bfd_set_format}
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@strong{Synopsis}
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@example
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boolean bfd_set_format(bfd *abfd, bfd_format format);
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@end example
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@strong{Description}@*
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This function sets the file format of the BFD @var{abfd} to the
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format @var{format}. 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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@findex bfd_format_string
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@subsubsection @code{bfd_format_string}
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@strong{Synopsis}
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@example
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CONST char *bfd_format_string(bfd_format format);
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@end example
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@strong{Description}@*
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Return a pointer to a const string
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@code{invalid}, @code{object}, @code{archive}, @code{core}, or @code{unknown},
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depending upon the value of @var{format}.
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