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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* Copyright (C) 2017, 2020 by William Wilgus
*
* 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 (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 "system.h"
#include "bootdata.h"
#include "crc32.h"
#include "loader_strerror.h"
#include "file.h"
#include <string.h>
#include <stdio.h>
/* Write bootdata into location in FIRMWARE marked by magic header
* Assumes buffer is already loaded with the firmware image
* We just need to find the location and write data into the
* payload region along with the crc for later verification and use.
* Returns payload len on success,
* On error returns EKEY_NOT_FOUND
*/
int write_bootdata(unsigned char* buf, int len, unsigned int boot_volume)
{
struct boot_data_t bl_boot_data;
struct boot_data_t *fw_boot_data = NULL;
int search_len = MIN(len, BOOT_DATA_SEARCH_SIZE) - sizeof(struct boot_data_t);
int payload_len = EKEY_NOT_FOUND;
/* search for boot data header prior to search_len */
for(int i = 0; i < search_len; i++)
{
fw_boot_data = (struct boot_data_t*) &buf[i];
if (fw_boot_data->magic[0] != BOOT_DATA_MAGIC0 ||
fw_boot_data->magic[1] != BOOT_DATA_MAGIC1)
continue;
memset(&bl_boot_data.payload, 0, BOOT_DATA_PAYLOAD_SIZE);
bl_boot_data.boot_volume = boot_volume;
memset(fw_boot_data->payload, 0, fw_boot_data->length);
/* determine maximum bytes we can write to firmware
BOOT_DATA_PAYLOAD_SIZE is the size the bootloader expects */
payload_len = MIN(BOOT_DATA_PAYLOAD_SIZE, fw_boot_data->length);
fw_boot_data->length = payload_len;
/* copy data to FIRMWARE bootdata struct */
memcpy(fw_boot_data->payload, &bl_boot_data.payload, payload_len);
/* crc will be used within the firmware to check validity of bootdata */
fw_boot_data->crc = crc_32(fw_boot_data->payload, payload_len, 0xffffffff);
break;
}
return payload_len;
}
#ifdef HAVE_MULTIBOOT
/* Check in root of this <volume> for rockbox_main.<playername>
* if this file empty or there is a single slash '/'
* buf = '<volume#>/<rootdir>/<firmware(name)>\0'
* If instead '/<*DIRECTORY*>' is supplied
* addpath will be set to this DIRECTORY buf =
* '/<volume#>/addpath/<rootdir>/<firmware(name)>\0'
* On error returns Negative number or 0
* On success returns bytes from snprintf
* and generated path will be placed in buf
* note: if supplied buffer is too small return will be
* the number of bytes that would have been written
*/
int get_redirect_dir(char* buf, int buffer_size, int volume,
const char* rootdir, const char* firmware)
{
int fd;
size_t f_offset;
char add_path[MAX_PATH];
/* Check in root of volume for rockbox_main.<playername> redirect */
snprintf(add_path, sizeof(add_path), "/<%d>/"BOOT_REDIR, volume);
fd = open(add_path, O_RDONLY);
if (fd < 0)
return EFILE_NOT_FOUND;
/*clear add_path for re-use*/
memset(add_path, 0, sizeof(add_path));
f_offset = read(fd, add_path,sizeof(add_path));
close(fd);
for(size_t i = f_offset - 1; i < f_offset; i--)
{
/* strip control chars < SPACE or all if path doesn't start with '/' */
if (add_path[i] < 0x20 || add_path[0] != '/')
add_path[i] = '\0';
}
/* if '/add_path' is specified in rockbox_main.<playername>
path is /<vol#>/add_path/rootdir/firmwarename
if add_path is empty or '/' is missing from beginning
path is /<vol#>/rootdir/firmwarename
*/
return snprintf(buf, buffer_size, "/<%d>%s/%s/%s", volume, add_path,
rootdir, firmware);
}
#endif
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