113 lines
4.4 KiB
C
113 lines
4.4 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2017, 2020 by William Wilgus
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "system.h"
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#include "bootdata.h"
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#include "crc32.h"
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#include "loader_strerror.h"
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#include "file.h"
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#include <string.h>
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#include <stdio.h>
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/* Write bootdata into location in FIRMWARE marked by magic header
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* Assumes buffer is already loaded with the firmware image
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* We just need to find the location and write data into the
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* payload region along with the crc for later verification and use.
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* Returns payload len on success,
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* On error returns EKEY_NOT_FOUND
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*/
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int write_bootdata(unsigned char* buf, int len, unsigned int boot_volume)
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{
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struct boot_data_t bl_boot_data;
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struct boot_data_t *fw_boot_data = NULL;
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int search_len = MIN(len, BOOT_DATA_SEARCH_SIZE) - sizeof(struct boot_data_t);
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int payload_len = EKEY_NOT_FOUND;
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/* search for boot data header prior to search_len */
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for(int i = 0; i < search_len; i++)
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{
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fw_boot_data = (struct boot_data_t*) &buf[i];
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if (fw_boot_data->magic[0] != BOOT_DATA_MAGIC0 ||
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fw_boot_data->magic[1] != BOOT_DATA_MAGIC1)
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continue;
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memset(&bl_boot_data.payload, 0, BOOT_DATA_PAYLOAD_SIZE);
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bl_boot_data.boot_volume = boot_volume;
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memset(fw_boot_data->payload, 0, fw_boot_data->length);
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/* determine maximum bytes we can write to firmware
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BOOT_DATA_PAYLOAD_SIZE is the size the bootloader expects */
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payload_len = MIN(BOOT_DATA_PAYLOAD_SIZE, fw_boot_data->length);
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fw_boot_data->length = payload_len;
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/* copy data to FIRMWARE bootdata struct */
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memcpy(fw_boot_data->payload, &bl_boot_data.payload, payload_len);
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/* crc will be used within the firmware to check validity of bootdata */
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fw_boot_data->crc = crc_32(fw_boot_data->payload, payload_len, 0xffffffff);
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break;
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}
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return payload_len;
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}
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#ifdef HAVE_MULTIBOOT
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/* Check in root of this <volume> for rockbox_main.<playername>
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* if this file empty or there is a single slash '/'
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* buf = '<volume#>/<rootdir>/<firmware(name)>\0'
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* If instead '/<*DIRECTORY*>' is supplied
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* addpath will be set to this DIRECTORY buf =
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* '/<volume#>/addpath/<rootdir>/<firmware(name)>\0'
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* On error returns Negative number or 0
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* On success returns bytes from snprintf
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* and generated path will be placed in buf
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* note: if supplied buffer is too small return will be
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* the number of bytes that would have been written
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*/
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int get_redirect_dir(char* buf, int buffer_size, int volume,
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const char* rootdir, const char* firmware)
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{
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int fd;
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size_t f_offset;
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char add_path[MAX_PATH];
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/* Check in root of volume for rockbox_main.<playername> redirect */
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snprintf(add_path, sizeof(add_path), "/<%d>/"BOOT_REDIR, volume);
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fd = open(add_path, O_RDONLY);
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if (fd < 0)
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return EFILE_NOT_FOUND;
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/*clear add_path for re-use*/
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memset(add_path, 0, sizeof(add_path));
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f_offset = read(fd, add_path,sizeof(add_path));
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close(fd);
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for(size_t i = f_offset - 1; i < f_offset; i--)
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{
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/* strip control chars < SPACE or all if path doesn't start with '/' */
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if (add_path[i] < 0x20 || add_path[0] != '/')
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add_path[i] = '\0';
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}
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/* if '/add_path' is specified in rockbox_main.<playername>
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path is /<vol#>/add_path/rootdir/firmwarename
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if add_path is empty or '/' is missing from beginning
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path is /<vol#>/rootdir/firmwarename
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*/
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return snprintf(buf, buffer_size, "/<%d>%s/%s/%s", volume, add_path,
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rootdir, firmware);
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}
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#endif
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