125b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Decompression support for libdwfl: zlib (gzip) and/or bzlib (bzip2). 225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Copyright (C) 2009 Red Hat, Inc. 325b3c049e70834cf33790a28643ab058b507b35cBen Cheng This file is part of Red Hat elfutils. 425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 525b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is free software; you can redistribute it and/or modify 625b3c049e70834cf33790a28643ab058b507b35cBen Cheng it under the terms of the GNU General Public License as published by the 725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Free Software Foundation; version 2 of the License. 825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 925b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is distributed in the hope that it will be useful, but 1025b3c049e70834cf33790a28643ab058b507b35cBen Cheng WITHOUT ANY WARRANTY; without even the implied warranty of 1125b3c049e70834cf33790a28643ab058b507b35cBen Cheng MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 1225b3c049e70834cf33790a28643ab058b507b35cBen Cheng General Public License for more details. 1325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1425b3c049e70834cf33790a28643ab058b507b35cBen Cheng You should have received a copy of the GNU General Public License along 1525b3c049e70834cf33790a28643ab058b507b35cBen Cheng with Red Hat elfutils; if not, write to the Free Software Foundation, 1625b3c049e70834cf33790a28643ab058b507b35cBen Cheng Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 1725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1825b3c049e70834cf33790a28643ab058b507b35cBen Cheng In addition, as a special exception, Red Hat, Inc. gives You the 1925b3c049e70834cf33790a28643ab058b507b35cBen Cheng additional right to link the code of Red Hat elfutils with code licensed 2025b3c049e70834cf33790a28643ab058b507b35cBen Cheng under any Open Source Initiative certified open source license 2125b3c049e70834cf33790a28643ab058b507b35cBen Cheng (http://www.opensource.org/licenses/index.php) which requires the 2225b3c049e70834cf33790a28643ab058b507b35cBen Cheng distribution of source code with any binary distribution and to 2325b3c049e70834cf33790a28643ab058b507b35cBen Cheng distribute linked combinations of the two. Non-GPL Code permitted under 2425b3c049e70834cf33790a28643ab058b507b35cBen Cheng this exception must only link to the code of Red Hat elfutils through 2525b3c049e70834cf33790a28643ab058b507b35cBen Cheng those well defined interfaces identified in the file named EXCEPTION 2625b3c049e70834cf33790a28643ab058b507b35cBen Cheng found in the source code files (the "Approved Interfaces"). The files 2725b3c049e70834cf33790a28643ab058b507b35cBen Cheng of Non-GPL Code may instantiate templates or use macros or inline 2825b3c049e70834cf33790a28643ab058b507b35cBen Cheng functions from the Approved Interfaces without causing the resulting 2925b3c049e70834cf33790a28643ab058b507b35cBen Cheng work to be covered by the GNU General Public License. Only Red Hat, 3025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Inc. may make changes or additions to the list of Approved Interfaces. 3125b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat's grant of this exception is conditioned upon your not adding 3225b3c049e70834cf33790a28643ab058b507b35cBen Cheng any new exceptions. If you wish to add a new Approved Interface or 3325b3c049e70834cf33790a28643ab058b507b35cBen Cheng exception, please contact Red Hat. You must obey the GNU General Public 3425b3c049e70834cf33790a28643ab058b507b35cBen Cheng License in all respects for all of the Red Hat elfutils code and other 3525b3c049e70834cf33790a28643ab058b507b35cBen Cheng code used in conjunction with Red Hat elfutils except the Non-GPL Code 3625b3c049e70834cf33790a28643ab058b507b35cBen Cheng covered by this exception. If you modify this file, you may extend this 3725b3c049e70834cf33790a28643ab058b507b35cBen Cheng exception to your version of the file, but you are not obligated to do 3825b3c049e70834cf33790a28643ab058b507b35cBen Cheng so. If you do not wish to provide this exception without modification, 3925b3c049e70834cf33790a28643ab058b507b35cBen Cheng you must delete this exception statement from your version and license 4025b3c049e70834cf33790a28643ab058b507b35cBen Cheng this file solely under the GPL without exception. 4125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is an included package of the Open Invention Network. 4325b3c049e70834cf33790a28643ab058b507b35cBen Cheng An included package of the Open Invention Network is a package for which 4425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Open Invention Network licensees cross-license their patents. No patent 4525b3c049e70834cf33790a28643ab058b507b35cBen Cheng license is granted, either expressly or impliedly, by designation as an 4625b3c049e70834cf33790a28643ab058b507b35cBen Cheng included package. Should you wish to participate in the Open Invention 4725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Network licensing program, please visit www.openinventionnetwork.com 4825b3c049e70834cf33790a28643ab058b507b35cBen Cheng <http://www.openinventionnetwork.com>. */ 4925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "libdwflP.h" 5125b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "system.h" 5225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5325b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <unistd.h> 5425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5525b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifdef LZMA 5625b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define USE_INFLATE 1 5725b3c049e70834cf33790a28643ab058b507b35cBen Cheng# include <lzma.h> 5825b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define unzip __libdw_unlzma 5925b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define DWFL_E_ZLIB DWFL_E_LZMA 6025b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define MAGIC "\xFD" "7zXZ\0" /* XZ file format. */ 6125b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define MAGIC2 "\x5d\0" /* Raw LZMA format. */ 6225b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define Z(what) LZMA_##what 6325b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define LZMA_ERRNO LZMA_PROG_ERROR 6425b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define z_stream lzma_stream 6525b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define inflateInit(z) lzma_auto_decoder (z, 1 << 30, 0) 6625b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define do_inflate(z) lzma_code (z, LZMA_RUN) 6725b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define inflateEnd(z) lzma_end (z) 6825b3c049e70834cf33790a28643ab058b507b35cBen Cheng#elif defined BZLIB 6925b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define USE_INFLATE 1 7025b3c049e70834cf33790a28643ab058b507b35cBen Cheng# include <bzlib.h> 7125b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define unzip __libdw_bunzip2 7225b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define DWFL_E_ZLIB DWFL_E_BZLIB 7325b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define MAGIC "BZh" 7425b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define Z(what) BZ_##what 7525b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define BZ_ERRNO BZ_IO_ERROR 7625b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define z_stream bz_stream 7725b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define inflateInit(z) BZ2_bzDecompressInit (z, 0, 0) 7825b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define do_inflate(z) BZ2_bzDecompress (z) 7925b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define inflateEnd(z) BZ2_bzDecompressEnd (z) 8025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#else 8125b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define USE_INFLATE 0 8225b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define crc32 loser_crc32 8325b3c049e70834cf33790a28643ab058b507b35cBen Cheng# include <zlib.h> 8425b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define unzip __libdw_gunzip 8525b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define MAGIC "\037\213" 8625b3c049e70834cf33790a28643ab058b507b35cBen Cheng# define Z(what) Z_##what 8725b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 8825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8925b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define READ_SIZE (1 << 20) 9025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9125b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* If this is not a compressed image, return DWFL_E_BADELF. 9225b3c049e70834cf33790a28643ab058b507b35cBen Cheng If we uncompressed it into *WHOLE, *WHOLE_SIZE, return DWFL_E_NOERROR. 9325b3c049e70834cf33790a28643ab058b507b35cBen Cheng Otherwise return an error for bad compressed data or I/O failure. 9425b3c049e70834cf33790a28643ab058b507b35cBen Cheng If we return an error after reading the first part of the file, 9525b3c049e70834cf33790a28643ab058b507b35cBen Cheng leave that portion malloc'd in *WHOLE, *WHOLE_SIZE. If *WHOLE 9625b3c049e70834cf33790a28643ab058b507b35cBen Cheng is not null on entry, we'll use it in lieu of repeating a read. */ 9725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9825b3c049e70834cf33790a28643ab058b507b35cBen ChengDwfl_Error internal_function 9925b3c049e70834cf33790a28643ab058b507b35cBen Chengunzip (int fd, off64_t start_offset, 10025b3c049e70834cf33790a28643ab058b507b35cBen Cheng void *mapped, size_t mapped_size, 10125b3c049e70834cf33790a28643ab058b507b35cBen Cheng void **whole, size_t *whole_size) 10225b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 10325b3c049e70834cf33790a28643ab058b507b35cBen Cheng void *buffer = NULL; 10425b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t size = 0; 10525b3c049e70834cf33790a28643ab058b507b35cBen Cheng inline bool bigger_buffer (size_t start) 10625b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 10725b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t more = size ? size * 2 : start; 10825b3c049e70834cf33790a28643ab058b507b35cBen Cheng char *b = realloc (buffer, more); 10925b3c049e70834cf33790a28643ab058b507b35cBen Cheng while (unlikely (b == NULL) && more >= size + 1024) 11025b3c049e70834cf33790a28643ab058b507b35cBen Cheng b = realloc (buffer, more -= 1024); 11125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (b == NULL)) 11225b3c049e70834cf33790a28643ab058b507b35cBen Cheng return false; 11325b3c049e70834cf33790a28643ab058b507b35cBen Cheng buffer = b; 11425b3c049e70834cf33790a28643ab058b507b35cBen Cheng size = more; 11525b3c049e70834cf33790a28643ab058b507b35cBen Cheng return true; 11625b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 11725b3c049e70834cf33790a28643ab058b507b35cBen Cheng inline void smaller_buffer (size_t end) 11825b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 11925b3c049e70834cf33790a28643ab058b507b35cBen Cheng buffer = realloc (buffer, end) ?: end == 0 ? NULL : buffer; 12025b3c049e70834cf33790a28643ab058b507b35cBen Cheng size = end; 12125b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 12225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 12325b3c049e70834cf33790a28643ab058b507b35cBen Cheng void *input_buffer = NULL; 12425b3c049e70834cf33790a28643ab058b507b35cBen Cheng off_t input_pos = 0; 12525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 12625b3c049e70834cf33790a28643ab058b507b35cBen Cheng inline Dwfl_Error fail (Dwfl_Error failure) 12725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 12825b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (input_pos == (off_t) mapped_size) 12925b3c049e70834cf33790a28643ab058b507b35cBen Cheng *whole = input_buffer; 13025b3c049e70834cf33790a28643ab058b507b35cBen Cheng else 13125b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 13225b3c049e70834cf33790a28643ab058b507b35cBen Cheng free (input_buffer); 13325b3c049e70834cf33790a28643ab058b507b35cBen Cheng *whole = NULL; 13425b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 13525b3c049e70834cf33790a28643ab058b507b35cBen Cheng free (buffer); 13625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return failure; 13725b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 13825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 13925b3c049e70834cf33790a28643ab058b507b35cBen Cheng inline Dwfl_Error zlib_fail (int result) 14025b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 14125b3c049e70834cf33790a28643ab058b507b35cBen Cheng switch (result) 14225b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 14325b3c049e70834cf33790a28643ab058b507b35cBen Cheng case Z (MEM_ERROR): 14425b3c049e70834cf33790a28643ab058b507b35cBen Cheng return fail (DWFL_E_NOMEM); 14525b3c049e70834cf33790a28643ab058b507b35cBen Cheng case Z (ERRNO): 14625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return fail (DWFL_E_ERRNO); 14725b3c049e70834cf33790a28643ab058b507b35cBen Cheng default: 14825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return fail (DWFL_E_ZLIB); 14925b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 15025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 15125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15225b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (mapped == NULL) 15325b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 15425b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (*whole == NULL) 15525b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 15625b3c049e70834cf33790a28643ab058b507b35cBen Cheng input_buffer = malloc (READ_SIZE); 15725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (input_buffer == NULL)) 15825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return DWFL_E_NOMEM; 15925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 16025b3c049e70834cf33790a28643ab058b507b35cBen Cheng ssize_t n = pread_retry (fd, input_buffer, READ_SIZE, start_offset); 16125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (n < 0)) 16225b3c049e70834cf33790a28643ab058b507b35cBen Cheng return zlib_fail (Z (ERRNO)); 16325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 16425b3c049e70834cf33790a28643ab058b507b35cBen Cheng input_pos = n; 16525b3c049e70834cf33790a28643ab058b507b35cBen Cheng mapped = input_buffer; 16625b3c049e70834cf33790a28643ab058b507b35cBen Cheng mapped_size = n; 16725b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 16825b3c049e70834cf33790a28643ab058b507b35cBen Cheng else 16925b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 17025b3c049e70834cf33790a28643ab058b507b35cBen Cheng input_buffer = *whole; 17125b3c049e70834cf33790a28643ab058b507b35cBen Cheng input_pos = mapped_size = *whole_size; 17225b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 17325b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 17425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 17525b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define NOMAGIC(magic) \ 17625b3c049e70834cf33790a28643ab058b507b35cBen Cheng (mapped_size <= sizeof magic || memcmp (mapped, magic, sizeof magic - 1)) 17725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 17825b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* First, look at the header. */ 17925b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (NOMAGIC (MAGIC) 18025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifdef MAGIC2 18125b3c049e70834cf33790a28643ab058b507b35cBen Cheng && NOMAGIC (MAGIC2) 18225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 18325b3c049e70834cf33790a28643ab058b507b35cBen Cheng ) 18425b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Not a compressed file. */ 18525b3c049e70834cf33790a28643ab058b507b35cBen Cheng return DWFL_E_BADELF; 18625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 18725b3c049e70834cf33790a28643ab058b507b35cBen Cheng#if USE_INFLATE 18825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 18925b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* This style actually only works with bzlib and liblzma. 19025b3c049e70834cf33790a28643ab058b507b35cBen Cheng The stupid zlib interface has nothing to grok the 19125b3c049e70834cf33790a28643ab058b507b35cBen Cheng gzip file headers except the slow gzFile interface. */ 19225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 19325b3c049e70834cf33790a28643ab058b507b35cBen Cheng z_stream z = { .next_in = mapped, .avail_in = mapped_size }; 19425b3c049e70834cf33790a28643ab058b507b35cBen Cheng int result = inflateInit (&z); 19525b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (result != Z (OK)) 19625b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 19725b3c049e70834cf33790a28643ab058b507b35cBen Cheng inflateEnd (&z); 19825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return zlib_fail (result); 19925b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 20025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 20125b3c049e70834cf33790a28643ab058b507b35cBen Cheng do 20225b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 20325b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (z.avail_in == 0 && input_buffer != NULL) 20425b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 20525b3c049e70834cf33790a28643ab058b507b35cBen Cheng ssize_t n = pread_retry (fd, input_buffer, READ_SIZE, 20625b3c049e70834cf33790a28643ab058b507b35cBen Cheng start_offset + input_pos); 20725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (n < 0)) 20825b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 20925b3c049e70834cf33790a28643ab058b507b35cBen Cheng inflateEnd (&z); 21025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return zlib_fail (Z (ERRNO)); 21125b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 21225b3c049e70834cf33790a28643ab058b507b35cBen Cheng z.next_in = input_buffer; 21325b3c049e70834cf33790a28643ab058b507b35cBen Cheng z.avail_in = n; 21425b3c049e70834cf33790a28643ab058b507b35cBen Cheng input_pos += n; 21525b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 21625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (z.avail_out == 0) 21725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 21825b3c049e70834cf33790a28643ab058b507b35cBen Cheng ptrdiff_t pos = (void *) z.next_out - buffer; 21925b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (!bigger_buffer (z.avail_in)) 22025b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 22125b3c049e70834cf33790a28643ab058b507b35cBen Cheng result = Z (MEM_ERROR); 22225b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 22325b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 22425b3c049e70834cf33790a28643ab058b507b35cBen Cheng z.next_out = buffer + pos; 22525b3c049e70834cf33790a28643ab058b507b35cBen Cheng z.avail_out = size - pos; 22625b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 22725b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 22825b3c049e70834cf33790a28643ab058b507b35cBen Cheng while ((result = do_inflate (&z)) == Z (OK)); 22925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 23025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifdef BZLIB 23125b3c049e70834cf33790a28643ab058b507b35cBen Cheng uint64_t total_out = (((uint64_t) z.total_out_hi32 << 32) 23225b3c049e70834cf33790a28643ab058b507b35cBen Cheng | z.total_out_lo32); 23325b3c049e70834cf33790a28643ab058b507b35cBen Cheng smaller_buffer (total_out); 23425b3c049e70834cf33790a28643ab058b507b35cBen Cheng#else 23525b3c049e70834cf33790a28643ab058b507b35cBen Cheng smaller_buffer (z.total_out); 23625b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 23725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 23825b3c049e70834cf33790a28643ab058b507b35cBen Cheng inflateEnd (&z); 23925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 24025b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (result != Z (STREAM_END)) 24125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return zlib_fail (result); 24225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 24325b3c049e70834cf33790a28643ab058b507b35cBen Cheng#else /* gzip only. */ 24425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 24525b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Let the decompression library read the file directly. */ 24625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 24725b3c049e70834cf33790a28643ab058b507b35cBen Cheng gzFile zf; 24825b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwfl_Error open_stream (void) 24925b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 25025b3c049e70834cf33790a28643ab058b507b35cBen Cheng int d = dup (fd); 25125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (d < 0)) 25225b3c049e70834cf33790a28643ab058b507b35cBen Cheng return DWFL_E_BADELF; 25325b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (start_offset != 0) 25425b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 25525b3c049e70834cf33790a28643ab058b507b35cBen Cheng off64_t off = lseek (d, start_offset, SEEK_SET); 25625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (off != start_offset) 25725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 25825b3c049e70834cf33790a28643ab058b507b35cBen Cheng close (d); 25925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return DWFL_E_BADELF; 26025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 26125b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 26225b3c049e70834cf33790a28643ab058b507b35cBen Cheng zf = gzdopen (d, "r"); 26325b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely (zf == NULL)) 26425b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 26525b3c049e70834cf33790a28643ab058b507b35cBen Cheng close (d); 26625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return zlib_fail (Z (MEM_ERROR)); 26725b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 26825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 26925b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* From here on, zlib will close D. */ 27025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 27125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return DWFL_E_NOERROR; 27225b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 27325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 27425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Dwfl_Error result = open_stream (); 27525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 27625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (result == DWFL_E_NOERROR && gzdirect (zf)) 27725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 27825b3c049e70834cf33790a28643ab058b507b35cBen Cheng gzclose (zf); 27925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return fail (DWFL_E_BADELF); 28025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 28125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 28225b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (result != DWFL_E_NOERROR) 28325b3c049e70834cf33790a28643ab058b507b35cBen Cheng return fail (result); 28425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 28525b3c049e70834cf33790a28643ab058b507b35cBen Cheng ptrdiff_t pos = 0; 28625b3c049e70834cf33790a28643ab058b507b35cBen Cheng while (1) 28725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 28825b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (!bigger_buffer (1024)) 28925b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 29025b3c049e70834cf33790a28643ab058b507b35cBen Cheng gzclose (zf); 29125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return zlib_fail (Z (MEM_ERROR)); 29225b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 29325b3c049e70834cf33790a28643ab058b507b35cBen Cheng int n = gzread (zf, buffer + pos, size - pos); 29425b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (n < 0) 29525b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 29625b3c049e70834cf33790a28643ab058b507b35cBen Cheng int code; 29725b3c049e70834cf33790a28643ab058b507b35cBen Cheng gzerror (zf, &code); 29825b3c049e70834cf33790a28643ab058b507b35cBen Cheng gzclose (zf); 29925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return zlib_fail (code); 30025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 30125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (n == 0) 30225b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 30325b3c049e70834cf33790a28643ab058b507b35cBen Cheng pos += n; 30425b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 30525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 30625b3c049e70834cf33790a28643ab058b507b35cBen Cheng gzclose (zf); 30725b3c049e70834cf33790a28643ab058b507b35cBen Cheng smaller_buffer (pos); 30825b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 30925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 31025b3c049e70834cf33790a28643ab058b507b35cBen Cheng free (input_buffer); 31125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 31225b3c049e70834cf33790a28643ab058b507b35cBen Cheng *whole = buffer; 31325b3c049e70834cf33790a28643ab058b507b35cBen Cheng *whole_size = size; 31425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 31525b3c049e70834cf33790a28643ab058b507b35cBen Cheng return DWFL_E_NOERROR; 31625b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 317