7fa48faeb5
The implementation of write_bootdata() and get_redirect_dir() was copied verbatim in two different places, obviously a bad thing for maintainability. This moves them to a new file multiboot.c as they are only used for multiboot. Change-Id: Id0279216e4dd019f8bf612a81d3835eff010e506
146 lines
4.4 KiB
C
146 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) 2005 by Linus Nielsen Feltzing
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* Copyright (C) 2017 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 1
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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 <stdio.h>
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#include "config.h"
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#include "system.h"
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#include "file.h"
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#include "loader_strerror.h"
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#include "checksum.h"
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#if defined(HAVE_BOOTDATA) || defined(HAVE_MULTIBOOT)
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#include "multiboot.h"
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#endif
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/* loads a firmware file from supplied filename
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* file opened, checks firmware size and checksum
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* if no error, firmware loaded to supplied buffer
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* file closed
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* Returns size of loaded image on success
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* On error returns Negative value deciphered by means
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* of strerror() function
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*/
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static int load_firmware_filename(unsigned char* buf,
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const char* filename,
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int buffer_size)
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{
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int len;
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unsigned long chksum;
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int ret;
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int fd = open(filename, O_RDONLY);
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if (fd < 0)
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return EFILE_NOT_FOUND;
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len = filesize(fd) - 8;
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if (len > buffer_size)
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{
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ret = EFILE_TOO_BIG;
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goto end;
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}
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lseek(fd, FIRMWARE_OFFSET_FILE_CRC, SEEK_SET);
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if (read(fd, &chksum, 4) < 4)
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{
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ret = EREAD_CHKSUM_FAILED;
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goto end;
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}
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chksum = betoh32(chksum); /* Rockbox checksums are big-endian */
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lseek(fd, FIRMWARE_OFFSET_FILE_DATA, SEEK_SET);
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if (read(fd, buf, len) < len)
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{
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ret = EREAD_IMAGE_FAILED;
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goto end;
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}
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if (!verify_checksum(chksum, buf, len))
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{
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ret = EBAD_CHKSUM;
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goto end;
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}
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ret = len;
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end:
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close(fd);
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return ret;
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}
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/* Load firmware image in a format created by add method of tools/scramble
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* on success we return size loaded image
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* on error we return negative value which can be deciphered by means
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* of strerror() function
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*/
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int load_firmware(unsigned char* buf, const char* firmware, int buffer_size)
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{
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int ret = EFILE_NOT_FOUND;
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char filename[MAX_PATH+2];
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/* only filename passed */
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if (firmware[0] != '/')
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{
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#ifdef HAVE_MULTIBOOT /* defined by config.h */
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/* checks <volumes> highest index to lowest for redirect file
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* 0 is the default boot volume, it is not checked here
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* if found <volume>/rockbox_main.<playername> and firmware
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* has a bootdata region this firmware will be loaded */
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for (unsigned int i = NUM_VOLUMES - 1; i > 0 && ret < 0; i--)
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{
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if (get_redirect_dir(filename, sizeof(filename), i,
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BOOTDIR, firmware) > 0)
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{
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ret = load_firmware_filename(buf, filename, buffer_size);
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/* if firmware has no boot_data don't load from external drive */
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if (write_bootdata(buf, ret, i) <= 0)
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ret = EKEY_NOT_FOUND;
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}
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/* if ret is valid breaks from loop to continue loading */
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}
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#endif
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if (ret < 0) /* Check default volume, no valid firmware file loaded yet */
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{
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/* First check in BOOTDIR */
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snprintf(filename, sizeof(filename), BOOTDIR "/%s",firmware);
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ret = load_firmware_filename(buf, filename, buffer_size);
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if (ret < 0)
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{
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/* Check in root dir */
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snprintf(filename, sizeof(filename),"/%s",firmware);
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ret = load_firmware_filename(buf, filename, buffer_size);
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}
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#ifdef HAVE_BOOTDATA
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/* 0 is the default boot volume */
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write_bootdata(buf, ret, 0);
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#endif
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}
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}
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else /* full path passed ROLO etc.*/
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ret = load_firmware_filename(buf, firmware, buffer_size);
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return ret;
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}
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