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/*
* Copyright (C) 2007 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 );
FILE_SECBOOT ( PERMITTED );
/** @file
*
* CPIO archives
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ipxe/cpio.h>
/** CPIO default file mode */
#define CPIO_DEFAULT_MODE 0644
/** CPIO directory mode */
#define CPIO_DEFAULT_DIR_MODE 0755
/**
* Set field within a CPIO header
*
* @v field Field within CPIO header
* @v value Value to set
*/
static void cpio_set_field ( char *field, unsigned long value ) {
char buf[9];
snprintf ( buf, sizeof ( buf ), "%08lx", value );
memcpy ( field, buf, 8 );
}
/**
* Get maximum number of CPIO headers (i.e. number of path components)
*
* @v image Image
* @ret max Maximum number of CPIO headers
*/
static unsigned int cpio_max ( struct image *image ) {
const char *name = cpio_name ( image );
unsigned int max = 0;
char c;
char p;
/* Check for existence of CPIO filename */
if ( ! name )
return 0;
/* Count number of path components */
for ( p = '/' ; ( ( ( c = *(name++) ) ) && ( c != ' ' ) ) ; p = c ) {
if ( ( p == '/' ) && ( c != '/' ) )
max++;
}
return max;
}
/**
* Get CPIO image filename
*
* @v image Image
* @v depth Path depth
* @ret len Filename length
*/
static size_t cpio_name_len ( struct image *image, unsigned int depth ) {
const char *name = cpio_name ( image );
size_t len;
char c;
char p;
/* Sanity checks */
assert ( name != NULL );
assert ( depth > 0 );
/* Calculate length up to specified path depth */
for ( len = 0, p = '/' ; ( ( ( c = name[len] ) ) && ( c != ' ' ) ) ;
len++, p = c ) {
if ( ( c == '/' ) && ( p != '/' ) && ( --depth == 0 ) )
break;
}
return len;
}
/**
* Parse CPIO image parameters
*
* @v image Image
* @v mode Mode to fill in
* @v count Number of CPIO headers to fill in
*/
static void cpio_parse_cmdline ( struct image *image, unsigned int *mode,
unsigned int *count ) {
const char *arg;
char *end;
/* Set default values */
*mode = CPIO_DEFAULT_MODE;
*count = 1;
/* Parse "mode=...", if present */
if ( ( arg = image_argument ( image, "mode=" ) ) ) {
*mode = strtoul ( arg, &end, 8 /* Octal for file mode */ );
if ( *end && ( *end != ' ' ) ) {
DBGC ( image, "CPIO %s strange \"mode=\" "
"terminator '%c'\n", image->name, *end );
}
}
/* Parse "mkdir=...", if present */
if ( ( arg = image_argument ( image, "mkdir=" ) ) ) {
*count += strtoul ( arg, &end, 10 );
if ( *end && ( *end != ' ' ) ) {
DBGC ( image, "CPIO %s strange \"mkdir=\" "
"terminator '%c'\n", image->name, *end );
}
}
/* Allow "mkdir=-1" to request creation of full directory tree */
if ( ! *count )
*count = -1U;
}
/**
* Construct CPIO header for image, if applicable
*
* @v image Image
* @v index CPIO header index
* @v cpio CPIO header to fill in
* @ret len Length of CPIO header (including name, excluding NUL)
*/
size_t cpio_header ( struct image *image, unsigned int index,
struct cpio_header *cpio ) {
const char *name = cpio_name ( image );
unsigned int mode;
unsigned int count;
unsigned int max;
unsigned int depth;
unsigned int i;
size_t name_len;
size_t len;
/* Parse command line arguments */
cpio_parse_cmdline ( image, &mode, &count );
/* Determine number of CPIO headers to be constructed */
max = cpio_max ( image );
if ( count > max )
count = max;
/* Determine path depth of this CPIO header */
if ( index >= count )
return 0;
depth = ( max - count + index + 1 );
/* Get filename length */
name_len = cpio_name_len ( image, depth );
/* Set directory mode or file mode as appropriate */
if ( name[name_len] == '/' ) {
mode = ( CPIO_MODE_DIR | CPIO_DEFAULT_DIR_MODE );
} else {
mode |= CPIO_MODE_FILE;
}
/* Set length on final header */
len = ( ( depth < max ) ? 0 : image->len );
/* Construct CPIO header */
memset ( cpio, '0', sizeof ( *cpio ) );
memcpy ( cpio->c_magic, CPIO_MAGIC, sizeof ( cpio->c_magic ) );
cpio_set_field ( cpio->c_mode, mode );
cpio_set_field ( cpio->c_nlink, 1 );
cpio_set_field ( cpio->c_filesize, len );
cpio_set_field ( cpio->c_namesize, ( name_len + 1 /* NUL */ ) );
DBGC ( image, "CPIO %s %d/%d \"", image->name, depth, max );
for ( i = 0 ; i < name_len ; i++ )
DBGC ( image, "%c", name[i] );
DBGC ( image, "\"\n" );
DBGC2_HDA ( image, 0, cpio, sizeof ( *cpio ) );
/* Calculate total length */
return ( sizeof ( *cpio ) + name_len );
}
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