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/*
* Copyright (C) 2021 Michael Brown <mbrown@fensystems.co.uk>.
*
* 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 2 of the
* License, or 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.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdlib.h>
#include <errno.h>
#include <assert.h>
#include <ipxe/deflate.h>
#include <ipxe/uaccess.h>
#include <ipxe/image.h>
#include <ipxe/zlib.h>
/** @file
*
* zlib compressed images
*
*/
/**
* Extract compressed data to image
*
* @v format Compression format code
* @v in Compressed input chunk
* @v extracted Extracted image
* @ret rc Return status code
*/
int zlib_deflate ( enum deflate_format format, struct deflate_chunk *in,
struct image *extracted ) {
struct deflate *deflate;
struct deflate_chunk out;
int rc;
/* Allocate and initialise decompressor */
deflate = zalloc ( sizeof ( *deflate ) );
if ( ! deflate ) {
rc = -ENOMEM;
goto err_alloc;
}
/* Decompress data, (re)allocating if necessary */
while ( 1 ) {
/* (Re)initialise decompressor */
deflate_init ( deflate, format );
/* (Re)initialise input chunk */
in->offset = 0;
/* Initialise output chunk */
deflate_chunk_init ( &out, extracted->data, 0, extracted->len );
/* Decompress data */
if ( ( rc = deflate_inflate ( deflate, in, &out ) ) != 0 ) {
DBGC ( extracted, "ZLIB %p could not decompress: %s\n",
extracted, strerror ( rc ) );
goto err_inflate;
}
/* Check that decompression is valid */
if ( ! deflate_finished ( deflate ) ) {
DBGC ( extracted, "ZLIB %p decompression incomplete\n",
extracted );
rc = -EINVAL;
goto err_unfinished;
}
/* Finish if output image size was correct */
if ( out.offset == extracted->len )
break;
/* Otherwise, resize output image and retry */
if ( ( rc = image_set_len ( extracted, out.offset ) ) != 0 ) {
DBGC ( extracted, "ZLIB %p could not resize: %s\n",
extracted, strerror ( rc ) );
goto err_set_size;
}
}
/* Success */
rc = 0;
err_set_size:
err_unfinished:
err_inflate:
free ( deflate );
err_alloc:
return rc;
}
/**
* Extract zlib image
*
* @v image Image
* @v extracted Extracted image
* @ret rc Return status code
*/
static int zlib_extract ( struct image *image, struct image *extracted ) {
struct deflate_chunk in;
int rc;
/* Initialise input chunk */
deflate_chunk_init ( &in, image->data, 0, image->len );
/* Decompress image */
if ( ( rc = zlib_deflate ( DEFLATE_ZLIB, &in, extracted ) ) != 0 )
return rc;
return 0;
}
/**
* Probe zlib image
*
* @v image zlib image
* @ret rc Return status code
*/
static int zlib_probe ( struct image *image ) {
union zlib_magic magic;
/* Sanity check */
if ( image->len < sizeof ( magic ) ) {
DBGC ( image, "ZLIB %p image too short\n", image );
return -ENOEXEC;
}
/* Check magic header */
copy_from_user ( &magic, image->data, 0, sizeof ( magic ) );
if ( ! zlib_magic_is_valid ( &magic ) ) {
DBGC ( image, "ZLIB %p invalid magic data\n", image );
return -ENOEXEC;
}
return 0;
}
/** zlib image type */
struct image_type zlib_image_type __image_type ( PROBE_NORMAL ) = {
.name = "zlib",
.probe = zlib_probe,
.extract = zlib_extract,
.exec = image_extract_exec,
};
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