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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.20.1/] [bfd/] [compress.c] - Rev 310
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/* ELF attributes support (based on ARM EABI attributes). Copyright 2008 Free Software Foundation, Inc. This file is part of BFD, the Binary File Descriptor library. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #include "config.h" #include "sysdep.h" #include "bfd.h" #include "libbfd.h" #ifdef HAVE_ZLIB_H #include <zlib.h> #endif /* FUNCTION bfd_uncompress_section_contents SYNOPSIS bfd_boolean bfd_uncompress_section_contents (bfd_byte **buffer, bfd_size_type *size); DESCRIPTION Uncompresses a section that was compressed using zlib, in place. At the call to this function, *@var{buffer} and *@var{size} should point to the section contents to be uncompressed. At the end of the function, *@var{buffer} and *@var{size} will point to the uncompressed contents. This function assumes *BUFFER was allocated using bfd_malloc() or equivalent. If the section is not a valid compressed section, or zlib is not installed on this machine, the input is unmodified. Returns @code{FALSE} if unable to uncompress successfully; in that case the input is unmodified. Otherwise, returns @code{TRUE}. */ bfd_boolean bfd_uncompress_section_contents (bfd_byte **buffer, bfd_size_type *size) { #ifndef HAVE_ZLIB_H /* These are just to quiet gcc. */ buffer = 0; size = 0; return FALSE; #else bfd_size_type compressed_size = *size; bfd_byte *compressed_buffer = *buffer; bfd_size_type uncompressed_size; bfd_byte *uncompressed_buffer; z_stream strm; int rc; bfd_size_type header_size = 12; /* Read the zlib header. In this case, it should be "ZLIB" followed by the uncompressed section size, 8 bytes in big-endian order. */ if (compressed_size < header_size || ! CONST_STRNEQ ((char*) compressed_buffer, "ZLIB")) return FALSE; uncompressed_size = compressed_buffer[4]; uncompressed_size <<= 8; uncompressed_size += compressed_buffer[5]; uncompressed_size <<= 8; uncompressed_size += compressed_buffer[6]; uncompressed_size <<= 8; uncompressed_size += compressed_buffer[7]; uncompressed_size <<= 8; uncompressed_size += compressed_buffer[8]; uncompressed_size <<= 8; uncompressed_size += compressed_buffer[9]; uncompressed_size <<= 8; uncompressed_size += compressed_buffer[10]; uncompressed_size <<= 8; uncompressed_size += compressed_buffer[11]; /* It is possible the section consists of several compressed buffers concatenated together, so we uncompress in a loop. */ strm.zalloc = NULL; strm.zfree = NULL; strm.opaque = NULL; strm.avail_in = compressed_size - header_size; strm.next_in = (Bytef*) compressed_buffer + header_size; strm.avail_out = uncompressed_size; uncompressed_buffer = (bfd_byte *) bfd_malloc (uncompressed_size); if (! uncompressed_buffer) return FALSE; rc = inflateInit (&strm); while (strm.avail_in > 0) { if (rc != Z_OK) goto fail; strm.next_out = ((Bytef*) uncompressed_buffer + (uncompressed_size - strm.avail_out)); rc = inflate (&strm, Z_FINISH); if (rc != Z_STREAM_END) goto fail; rc = inflateReset (&strm); } rc = inflateEnd (&strm); if (rc != Z_OK || strm.avail_out != 0) goto fail; free (compressed_buffer); *buffer = uncompressed_buffer; *size = uncompressed_size; return TRUE; fail: free (uncompressed_buffer); return FALSE; #endif /* HAVE_ZLIB_H */ }
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