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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* Copyright (C) 2005 by Linus Nielsen Feltzing
*
* 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 1
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include "config.h"
#include "system.h"
#include "file.h"
#include "rb-loader.h"
#include "loader_strerror.h"
/* Load firmware image in a format created by add method of tools/scramble
* on success we return size loaded image
* on error we return negative value which can be deciphered by means
* of strerror() function
*/
int load_firmware(unsigned char* buf, const char* firmware, int buffer_size)
{
char filename[MAX_PATH];
int fd;
int rc;
int len;
int ret = 0;
unsigned long chksum;
unsigned long sum;
int i;
/* only filename passed */
if (firmware[0] != '/')
{
/* First check in BOOTDIR */
snprintf(filename, sizeof(filename), BOOTDIR "/%s",firmware);
fd = open(filename, O_RDONLY);
if(fd < 0)
{
/* Check in root dir */
snprintf(filename, sizeof(filename),"/%s",firmware);
fd = open(filename, O_RDONLY);
if (fd < 0)
return EFILE_NOT_FOUND;
}
}
else
{
/* full path passed */
fd = open(firmware, O_RDONLY);
if (fd < 0)
return EFILE_NOT_FOUND;
}
len = filesize(fd) - 8;
if (len > buffer_size)
{
ret = EFILE_TOO_BIG;
goto end;
}
lseek(fd, FIRMWARE_OFFSET_FILE_CRC, SEEK_SET);
rc = read(fd, &chksum, 4);
chksum = betoh32(chksum); /* Rockbox checksums are big-endian */
if(rc < 4)
{
ret = EREAD_CHKSUM_FAILED;
goto end;
}
lseek(fd, FIRMWARE_OFFSET_FILE_DATA, SEEK_SET);
rc = read(fd, buf, len);
if(rc < len)
{
ret = EREAD_IMAGE_FAILED;
goto end;
}
sum = MODEL_NUMBER;
for(i = 0;i < len;i++)
{
sum += buf[i];
}
if(sum != chksum)
{
ret = EBAD_CHKSUM;
goto end;
}
ret = len;
end:
close(fd);
return ret;
}
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