215 lines
6.5 KiB
C
215 lines
6.5 KiB
C
/* Generic BFD support for file formats.
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Copyright (C) 1990-1991 Free Software Foundation, Inc.
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Written by Cygnus Support.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/*doc*
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@section File Formats
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A format is a BFD concept of high level file contents. The
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formats supported by BFD are:
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@table @code
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@item bfd_object
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The BFD may contain data, symbols, relocations and debug info.
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@item bfd_archive
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The BFD contains other BFDs and an optional index.
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@item bfd_core
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The BFD contains the result of an executable core dump.
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@end table
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*/
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#include "sysdep.h"
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#include "bfd.h"
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#include "libbfd.h"
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extern bfd_target *target_vector[];
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extern bfd_target *default_vector[];
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/*proto*
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*i bfd_check_format
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This routine is supplied a BFD and a format. It attempts to verify if
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the file attatched to the BFD is indeed compatible with the format
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specified (ie, one of @code{bfd_object}, @code{bfd_archive} or
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@code{bfd_core}).
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If the BFD has been set to a specific @var{target} before the call,
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only the named target and format combination will be checked. If the
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target has not been set, or has been set to @code{default} then all
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the known target backends will be interrogated to determine a match.
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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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@table @code
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@item
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invalid_operation
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if @code{format} is not one of @code{bfd_object}, @code{bfd_archive}
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or @code{bfd_core}.
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@item system_call_error
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if an error occured during a read - even some file mismatches can
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cause system_call_errros
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@item file_not_recognised
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none of the backends recognised the file format
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@item file_ambiguously_recognized
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more than one backend recognised the file format.
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@end table
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*; PROTO(boolean, bfd_check_format, (bfd *abfd, bfd_format format));
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*-*/
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boolean
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DEFUN(bfd_check_format,(abfd, format),
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bfd *abfd AND
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bfd_format format)
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{
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bfd_target **target, *save_targ, *right_targ;
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int match_count;
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if (!bfd_read_p (abfd) ||
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((int)(abfd->format) < (int)bfd_unknown) ||
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((int)(abfd->format) >= (int)bfd_type_end)) {
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bfd_error = invalid_operation;
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return false;
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}
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if (abfd->format != bfd_unknown)
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return (abfd->format == format)? true: false;
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/* presume the answer is yes */
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abfd->format = format;
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/* If the target type was explicitly specified, just check that target. */
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if (!abfd->target_defaulted) {
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bfd_seek (abfd, (file_ptr)0, SEEK_SET); /* rewind! */
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right_targ = BFD_SEND_FMT (abfd, _bfd_check_format, (abfd));
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if (right_targ) {
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abfd->xvec = right_targ; /* Set the target as returned */
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return true; /* File position has moved, BTW */
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}
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abfd->format = bfd_unknown;
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return false; /* Specified target is not right */
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}
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/* Since the target type was defaulted, check them
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all in the hope that one will be uniquely recognized. */
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save_targ = abfd->xvec;
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match_count = 0;
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right_targ = 0;
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for (target = target_vector; *target != NULL; target++) {
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bfd_target *temp;
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abfd->xvec = *target; /* Change BFD's target temporarily */
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bfd_seek (abfd, (file_ptr)0, SEEK_SET);
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temp = BFD_SEND_FMT (abfd, _bfd_check_format, (abfd));
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if (temp) { /* This format checks out as ok! */
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right_targ = temp;
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match_count++;
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/* If this is the default target, accept it, even if other targets
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might match. People who want those other targets have to set
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the GNUTARGET variable. */
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if (temp == default_vector[0])
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break;
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#ifdef GNU960
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/* Big- and little-endian b.out archives look the same, but it doesn't
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* matter: there is no difference in their headers, and member file byte
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* orders will (I hope) be handled appropriately by bfd. Ditto for big
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* and little coff archives. And the 4 coff/b.out object formats are
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* unambiguous. So accept the first match we find.
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*/
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break;
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#endif
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}
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}
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if (match_count == 1) {
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abfd->xvec = right_targ; /* Change BFD's target permanently */
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return true; /* File position has moved, BTW */
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}
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abfd->xvec = save_targ; /* Restore original target type */
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abfd->format = bfd_unknown; /* Restore original format */
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bfd_error = ((match_count == 0) ? file_not_recognized :
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file_ambiguously_recognized);
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return false;
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}
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/*proto*
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*i bfd_set_format
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This function sets the file format of the supplied BFD to the format
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requested. If the target set in the BFD does not support the format
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requested, the format is illegal or the BFD is not open for writing
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than an error occurs.
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*; PROTO(boolean,bfd_set_format,(bfd *, bfd_format));
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*-*/
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boolean
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DEFUN(bfd_set_format,(abfd, format),
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bfd *abfd AND
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bfd_format format)
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{
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if (bfd_read_p (abfd) ||
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((int)abfd->format < (int)bfd_unknown) ||
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((int)abfd->format >= (int)bfd_type_end)) {
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bfd_error = invalid_operation;
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return false;
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}
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if (abfd->format != bfd_unknown)
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return (abfd->format == format) ? true:false;
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/* presume the answer is yes */
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abfd->format = format;
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if (!BFD_SEND_FMT (abfd, _bfd_set_format, (abfd))) {
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abfd->format = bfd_unknown;
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return false;
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}
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return true;
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}
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/*proto*
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*i bfd_format_string
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This function takes one argument, and enumerated type (bfd_format) and
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returns a pointer to a const string "invalid", "object", "archive",
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"core" or "unknown" depending upon the value of the enumeration.
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*; PROTO(CONST char *, bfd_format_string, (bfd_format));
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*-*/
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CONST char *
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DEFUN(bfd_format_string,(format),
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bfd_format format)
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{
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if (((int)format <(int) bfd_unknown)
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|| ((int)format >=(int) bfd_type_end))
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return "invalid";
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switch (format) {
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case bfd_object:
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return "object"; /* linker/assember/compiler output */
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case bfd_archive:
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return "archive"; /* object archive file */
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case bfd_core:
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return "core"; /* core dump */
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default:
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return "unknown";
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}
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}
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