0acf065b19
* compress.c (bfd_uncompress_section_contents): Add ATTRIBUTE_UNUSED. * dwarf2.c (read_and_uncompress_section): New function. (read_section): Call it. (find_line): Likewise. binutils/ChangeLog: * objdump.c (load_specific_debug_section): Decompress section contents before applying relocations. * readelf.c (load_specific_debug_section): Update section size after decompression. gas/ChangeLog: * Makefile.am: Add compress-debug.c and compress-debug.h. * Makefile.in: Regenerate. * config.in: Add HAVE_ZLIB_H. * configure.in: Check for zlib.h. * configure: Regenerate. * as.c (parse_args): Add --compress-debug-sections and --nocompress-debug-sections. * as.h (flag_compress_debug): New variable. * compress-debug.c: New file. * compress-debug.h: New file. * write.c: Include compress-debug.h. (compress_frag): New function. (compress_debug): New function. (write_object_file): Compress debug sections if requested.
120 lines
4 KiB
C
120 lines
4 KiB
C
/* Compressed section support (intended for debug sections).
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Copyright 2008, 2010
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Free Software Foundation, Inc.
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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 3 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., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "config.h"
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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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#ifdef HAVE_ZLIB_H
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#include <zlib.h>
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#endif
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/*
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FUNCTION
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bfd_uncompress_section_contents
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SYNOPSIS
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bfd_boolean bfd_uncompress_section_contents
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(bfd_byte **buffer, bfd_size_type *size);
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DESCRIPTION
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Uncompresses a section that was compressed using zlib, in place. At
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the call to this function, *@var{buffer} and *@var{size} should point
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to the section contents to be uncompressed. At the end of the
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function, *@var{buffer} and *@var{size} will point to the uncompressed
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contents. This function assumes *BUFFER was allocated using
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bfd_malloc() or equivalent. If the section is not a valid compressed
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section, or zlib is not installed on this machine, the input is
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unmodified.
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Returns @code{FALSE} if unable to uncompress successfully; in that case
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the input is unmodified. Otherwise, returns @code{TRUE}.
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*/
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bfd_boolean
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bfd_uncompress_section_contents (bfd_byte **buffer ATTRIBUTE_UNUSED,
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bfd_size_type *size ATTRIBUTE_UNUSED)
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{
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#ifndef HAVE_ZLIB_H
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return FALSE;
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#else
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bfd_size_type compressed_size = *size;
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bfd_byte *compressed_buffer = *buffer;
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bfd_size_type uncompressed_size;
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bfd_byte *uncompressed_buffer;
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z_stream strm;
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int rc;
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bfd_size_type header_size = 12;
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/* Read the zlib header. In this case, it should be "ZLIB" followed
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by the uncompressed section size, 8 bytes in big-endian order. */
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if (compressed_size < header_size
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|| ! CONST_STRNEQ ((char*) compressed_buffer, "ZLIB"))
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return FALSE;
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uncompressed_size = compressed_buffer[4]; uncompressed_size <<= 8;
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uncompressed_size += compressed_buffer[5]; uncompressed_size <<= 8;
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uncompressed_size += compressed_buffer[6]; uncompressed_size <<= 8;
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uncompressed_size += compressed_buffer[7]; uncompressed_size <<= 8;
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uncompressed_size += compressed_buffer[8]; uncompressed_size <<= 8;
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uncompressed_size += compressed_buffer[9]; uncompressed_size <<= 8;
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uncompressed_size += compressed_buffer[10]; uncompressed_size <<= 8;
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uncompressed_size += compressed_buffer[11];
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/* It is possible the section consists of several compressed
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buffers concatenated together, so we uncompress in a loop. */
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strm.zalloc = NULL;
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strm.zfree = NULL;
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strm.opaque = NULL;
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strm.avail_in = compressed_size - header_size;
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strm.next_in = (Bytef*) compressed_buffer + header_size;
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strm.avail_out = uncompressed_size;
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uncompressed_buffer = (bfd_byte *) bfd_malloc (uncompressed_size);
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if (! uncompressed_buffer)
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return FALSE;
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rc = inflateInit (&strm);
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while (strm.avail_in > 0)
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{
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if (rc != Z_OK)
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goto fail;
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strm.next_out = ((Bytef*) uncompressed_buffer
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+ (uncompressed_size - strm.avail_out));
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rc = inflate (&strm, Z_FINISH);
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if (rc != Z_STREAM_END)
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goto fail;
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rc = inflateReset (&strm);
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}
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rc = inflateEnd (&strm);
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if (rc != Z_OK
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|| strm.avail_out != 0)
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goto fail;
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free (compressed_buffer);
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*buffer = uncompressed_buffer;
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*size = uncompressed_size;
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return TRUE;
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fail:
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free (uncompressed_buffer);
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return FALSE;
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#endif /* HAVE_ZLIB_H */
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}
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