428 lines
12 KiB
C
428 lines
12 KiB
C
/* Compressed section support (intended for debug sections).
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Copyright 2008, 2010, 2011, 2012
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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 "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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#ifdef HAVE_ZLIB_H
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static bfd_boolean
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decompress_contents (bfd_byte *compressed_buffer,
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bfd_size_type compressed_size,
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bfd_byte *uncompressed_buffer,
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bfd_size_type uncompressed_size)
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{
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z_stream strm;
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int rc;
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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 - 12;
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strm.next_in = (Bytef*) compressed_buffer + 12;
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strm.avail_out = uncompressed_size;
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rc = inflateInit (&strm);
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while (strm.avail_in > 0 && strm.avail_out > 0)
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{
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if (rc != Z_OK)
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return FALSE;
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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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return FALSE;
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rc = inflateReset (&strm);
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}
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rc = inflateEnd (&strm);
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return rc == Z_OK && strm.avail_out == 0;
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}
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#endif
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/*
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FUNCTION
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bfd_compress_section_contents
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SYNOPSIS
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bfd_boolean bfd_compress_section_contents
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(bfd *abfd, asection *section, bfd_byte *uncompressed_buffer,
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bfd_size_type uncompressed_size);
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DESCRIPTION
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Compress data of the size specified in @var{uncompressed_size}
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and pointed to by @var{uncompressed_buffer} using zlib and store
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as the contents field. This function assumes the contents
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field was allocated using bfd_malloc() or equivalent. If zlib
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is not installed on this machine, the input is unmodified.
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Return @code{TRUE} if the full section contents is compressed
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successfully.
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*/
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bfd_boolean
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bfd_compress_section_contents (bfd *abfd ATTRIBUTE_UNUSED,
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sec_ptr sec ATTRIBUTE_UNUSED,
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bfd_byte *uncompressed_buffer ATTRIBUTE_UNUSED,
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bfd_size_type uncompressed_size ATTRIBUTE_UNUSED)
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{
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#ifndef HAVE_ZLIB_H
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bfd_set_error (bfd_error_invalid_operation);
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return FALSE;
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#else
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uLong compressed_size;
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bfd_byte *compressed_buffer;
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compressed_size = compressBound (uncompressed_size) + 12;
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compressed_buffer = (bfd_byte *) bfd_malloc (compressed_size);
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if (compressed_buffer == NULL)
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return FALSE;
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if (compress ((Bytef*) compressed_buffer + 12,
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&compressed_size,
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(const Bytef*) uncompressed_buffer,
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uncompressed_size) != Z_OK)
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{
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free (compressed_buffer);
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bfd_set_error (bfd_error_bad_value);
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return FALSE;
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}
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/* Write 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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memcpy (compressed_buffer, "ZLIB", 4);
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compressed_buffer[11] = uncompressed_size; uncompressed_size >>= 8;
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compressed_buffer[10] = uncompressed_size; uncompressed_size >>= 8;
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compressed_buffer[9] = uncompressed_size; uncompressed_size >>= 8;
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compressed_buffer[8] = uncompressed_size; uncompressed_size >>= 8;
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compressed_buffer[7] = uncompressed_size; uncompressed_size >>= 8;
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compressed_buffer[6] = uncompressed_size; uncompressed_size >>= 8;
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compressed_buffer[5] = uncompressed_size; uncompressed_size >>= 8;
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compressed_buffer[4] = uncompressed_size;
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compressed_size += 12;
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/* Free the uncompressed contents if we compress in place. */
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if (uncompressed_buffer == sec->contents)
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free (uncompressed_buffer);
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sec->contents = compressed_buffer;
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sec->size = compressed_size;
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sec->compress_status = COMPRESS_SECTION_DONE;
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return TRUE;
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#endif /* HAVE_ZLIB_H */
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}
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/*
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FUNCTION
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bfd_get_full_section_contents
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SYNOPSIS
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bfd_boolean bfd_get_full_section_contents
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(bfd *abfd, asection *section, bfd_byte **ptr);
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DESCRIPTION
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Read all data from @var{section} in BFD @var{abfd}, decompress
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if needed, and store in @var{*ptr}. If @var{*ptr} is NULL,
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return @var{*ptr} with memory malloc'd by this function.
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Return @code{TRUE} if the full section contents is retrieved
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successfully.
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*/
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bfd_boolean
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bfd_get_full_section_contents (bfd *abfd, sec_ptr sec, bfd_byte **ptr)
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{
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bfd_size_type sz;
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bfd_byte *p = *ptr;
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#ifdef HAVE_ZLIB_H
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bfd_boolean ret;
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bfd_size_type save_size;
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bfd_size_type save_rawsize;
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bfd_byte *compressed_buffer;
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#endif
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if (abfd->direction != write_direction && sec->rawsize != 0)
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sz = sec->rawsize;
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else
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sz = sec->size;
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if (sz == 0)
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return TRUE;
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switch (sec->compress_status)
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{
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case COMPRESS_SECTION_NONE:
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if (p == NULL)
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{
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p = (bfd_byte *) bfd_malloc (sz);
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if (p == NULL)
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return FALSE;
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}
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if (!bfd_get_section_contents (abfd, sec, p, 0, sz))
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{
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if (*ptr != p)
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free (p);
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return FALSE;
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}
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*ptr = p;
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return TRUE;
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case DECOMPRESS_SECTION_SIZED:
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#ifndef HAVE_ZLIB_H
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bfd_set_error (bfd_error_invalid_operation);
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return FALSE;
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#else
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/* Read in the full compressed section contents. */
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compressed_buffer = (bfd_byte *) bfd_malloc (sec->compressed_size);
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if (compressed_buffer == NULL)
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return FALSE;
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save_rawsize = sec->rawsize;
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save_size = sec->size;
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/* Clear rawsize, set size to compressed size and set compress_status
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to COMPRESS_SECTION_NONE. If the compressed size is bigger than
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the uncompressed size, bfd_get_section_contents will fail. */
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sec->rawsize = 0;
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sec->size = sec->compressed_size;
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sec->compress_status = COMPRESS_SECTION_NONE;
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ret = bfd_get_section_contents (abfd, sec, compressed_buffer,
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0, sec->compressed_size);
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/* Restore rawsize and size. */
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sec->rawsize = save_rawsize;
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sec->size = save_size;
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sec->compress_status = DECOMPRESS_SECTION_SIZED;
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if (!ret)
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goto fail_compressed;
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if (p == NULL)
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p = (bfd_byte *) bfd_malloc (sz);
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if (p == NULL)
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goto fail_compressed;
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if (!decompress_contents (compressed_buffer, sec->compressed_size, p, sz))
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{
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bfd_set_error (bfd_error_bad_value);
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if (p != *ptr)
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free (p);
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fail_compressed:
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free (compressed_buffer);
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return FALSE;
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}
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free (compressed_buffer);
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*ptr = p;
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return TRUE;
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#endif
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case COMPRESS_SECTION_DONE:
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if (p == NULL)
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{
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p = (bfd_byte *) bfd_malloc (sz);
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if (p == NULL)
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return FALSE;
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*ptr = p;
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}
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memcpy (p, sec->contents, sz);
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return TRUE;
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default:
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abort ();
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}
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}
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/*
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FUNCTION
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bfd_cache_section_contents
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SYNOPSIS
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void bfd_cache_section_contents
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(asection *sec, void *contents);
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DESCRIPTION
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Stash @var(contents) so any following reads of @var(sec) do
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not need to decompress again.
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*/
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void
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bfd_cache_section_contents (asection *sec, void *contents)
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{
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if (sec->compress_status == DECOMPRESS_SECTION_SIZED)
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sec->compress_status = COMPRESS_SECTION_DONE;
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sec->contents = contents;
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sec->flags |= SEC_IN_MEMORY;
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}
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/*
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FUNCTION
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bfd_is_section_compressed
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SYNOPSIS
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bfd_boolean bfd_is_section_compressed
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(bfd *abfd, asection *section);
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DESCRIPTION
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Return @code{TRUE} if @var{section} is compressed.
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*/
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bfd_boolean
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bfd_is_section_compressed (bfd *abfd, sec_ptr sec)
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{
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bfd_byte compressed_buffer [12];
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unsigned int saved = sec->compress_status;
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bfd_boolean compressed;
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/* Don't decompress the section. */
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sec->compress_status = COMPRESS_SECTION_NONE;
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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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compressed = (bfd_get_section_contents (abfd, sec, compressed_buffer, 0, 12)
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&& CONST_STRNEQ ((char*) compressed_buffer, "ZLIB"));
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/* Restore compress_status. */
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sec->compress_status = saved;
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return compressed;
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}
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/*
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FUNCTION
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bfd_init_section_decompress_status
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SYNOPSIS
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bfd_boolean bfd_init_section_decompress_status
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(bfd *abfd, asection *section);
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DESCRIPTION
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Record compressed section size, update section size with
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decompressed size and set compress_status to
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DECOMPRESS_SECTION_SIZED.
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Return @code{FALSE} if the section is not a valid compressed
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section or zlib is not installed on this machine. Otherwise,
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return @code{TRUE}.
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*/
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bfd_boolean
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bfd_init_section_decompress_status (bfd *abfd ATTRIBUTE_UNUSED,
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sec_ptr sec ATTRIBUTE_UNUSED)
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{
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#ifndef HAVE_ZLIB_H
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bfd_set_error (bfd_error_invalid_operation);
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return FALSE;
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#else
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bfd_byte compressed_buffer [12];
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bfd_size_type uncompressed_size;
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if (sec->rawsize != 0
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|| sec->contents != NULL
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|| sec->compress_status != COMPRESS_SECTION_NONE
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|| !bfd_get_section_contents (abfd, sec, compressed_buffer, 0, 12))
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{
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bfd_set_error (bfd_error_invalid_operation);
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return FALSE;
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}
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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 (! CONST_STRNEQ ((char*) compressed_buffer, "ZLIB"))
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{
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bfd_set_error (bfd_error_wrong_format);
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return FALSE;
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}
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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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sec->compressed_size = sec->size;
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sec->size = uncompressed_size;
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sec->compress_status = DECOMPRESS_SECTION_SIZED;
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return TRUE;
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#endif
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}
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/*
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FUNCTION
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bfd_init_section_compress_status
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SYNOPSIS
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bfd_boolean bfd_init_section_compress_status
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(bfd *abfd, asection *section);
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DESCRIPTION
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If open for read, compress section, update section size with
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compressed size and set compress_status to COMPRESS_SECTION_DONE.
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Return @code{FALSE} if the section is not a valid compressed
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section or zlib is not installed on this machine. Otherwise,
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return @code{TRUE}.
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*/
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bfd_boolean
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bfd_init_section_compress_status (bfd *abfd ATTRIBUTE_UNUSED,
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sec_ptr sec ATTRIBUTE_UNUSED)
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{
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#ifndef HAVE_ZLIB_H
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bfd_set_error (bfd_error_invalid_operation);
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return FALSE;
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#else
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bfd_size_type uncompressed_size;
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bfd_byte *uncompressed_buffer;
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bfd_boolean ret;
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/* Error if not opened for read. */
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if (abfd->direction != read_direction
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|| sec->size == 0
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|| sec->rawsize != 0
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|| sec->contents != NULL
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|| sec->compress_status != COMPRESS_SECTION_NONE)
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{
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bfd_set_error (bfd_error_invalid_operation);
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return FALSE;
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}
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/* Read in the full section contents and compress it. */
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uncompressed_size = sec->size;
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uncompressed_buffer = (bfd_byte *) bfd_malloc (uncompressed_size);
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if (!bfd_get_section_contents (abfd, sec, uncompressed_buffer,
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0, uncompressed_size))
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ret = FALSE;
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else
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ret = bfd_compress_section_contents (abfd, sec,
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uncompressed_buffer,
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uncompressed_size);
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free (uncompressed_buffer);
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return ret;
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#endif
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}
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