UWfirmforce
/* $Id: romfs.c,v 1.1 2009/02/21 21:25:20 khorben Exp $ */
/* Copyright (c) 2008 khorben of Uberwall */
/* 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 version 2 of the License.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <string.h>
#include "plugin.h"
/* romfs */
/* public */
/* types */
#pragma pack(1)
struct romfs
{
char sig[8];
uint32_t size;
uint32_t checksum;
};
struct romfh
{
uint32_t next;
uint32_t spec;
uint32_t size;
uint32_t checksum;
};
#pragma pack()
/* variables */
/* magic */
static unsigned char sig[] = "-rom1fs-";
static PluginMagic romfs_magic[] =
{
{ sizeof(struct romfs), 0, sig, sizeof(sig)-1 },
{ 0, 0, NULL, 0 }
};
/* functions */
static int romfs_callback(PluginHelper * ph, int signature, FILE * fp);
/* plugin */
Plugin plugin =
{
PT_ARCHIVE,
"ROMFS",
romfs_magic,
romfs_callback
};
/* private */
/* functions */
/* romfs_callback */
static int _callback_members(PluginHelper * ph, FILE * fp, uint32_t size,
char buf[1024], size_t len, size_t i);
static int romfs_callback(PluginHelper * ph, int signature, FILE * fp)
{
char buf[1024];
struct romfs * hdr;
size_t len;
size_t i;
if((len = fread(buf, sizeof(char), sizeof(buf), fp)) < sizeof(*hdr))
return -1;
hdr = (struct romfs *)buf;
hdr->size = htob32(hdr->size);
ph->printf(ph, "%s%u", "size ", hdr->size);
for(i = sizeof(*hdr); i < len && buf[i] != '\0'; i++);
if(i == len) /* no string termination found */
{
ph->printf(ph, "%s", ", volume name too long\n");
return 0;
}
ph->printf(ph, "%s%s%s", ", volume name \"", &buf[sizeof(*hdr)],
"\"\n");
i += i % 16 == 0 ? 0 : 16 - (i % 16); /* 16 byte alignment */
return _callback_members(ph, fp, hdr->size, buf, len, i);
}
static int _callback_members(PluginHelper * ph, FILE * fp, uint32_t size,
char buf[1024], size_t len, size_t i)
{
char * mode[8] =
{
"hard link", "directory", "regular file", "symbolic link",
"block device", "char device", "socket", "fifo"
};
struct romfh * fhdr;
size_t cnt = 0;
while(len >= i)
{
memmove(buf, &buf[i], len - i);
len-=i;
if((i = fread(&buf[len], sizeof(char), 1024 - len, fp)) == 0
&& len < sizeof(*fhdr))
break;
len+=i;
fhdr = (struct romfh*)buf;
fhdr->next = htob32(fhdr->next);
fhdr->size = htob32(fhdr->size);
for(i = sizeof(*fhdr); buf[i] != '\0' && i < len; i++);
if(i == len) /* no string termination found */
break;
if(fhdr->size > size) /* FIXME still too imprecise */
break;
ph->printf(ph, "%s%u%s%u%s%s%s%s%s", "member #", cnt++,
": size ", fhdr->size, ", filename \"",
&buf[sizeof(*fhdr)], "\", ",
mode[fhdr->next & 0x7], "\n");
if((fhdr->next & ~0xf) == 0)
break;
i += (i % 16 == 0) ? 0 : 16 - (i % 16); /* 16 byte alignment */
if(i + fhdr->size > len) /* next header is past buffer */
{
if(fseek(fp, fhdr->size + len - i, SEEK_CUR) != 0)
return -1;
i = 0;
len = 0;
}
else /* next header starts in current buffer */
i += fhdr->size;
/* FIXME 16-byte alignment probably required here */
}
return 100;
}