149 lines
3.6 KiB
C
149 lines
3.6 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) 2012 Marcin Bukat
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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 "config.h"
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#include "rkw-loader.h"
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#include "crc32-rkw.h"
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#include "file.h"
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#include "panic.h"
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/* error strings sorted by number */
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/* error 0 is empty */
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static const char *err_str[] = {
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"Loading OK",
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"Can't open RKW file",
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"Can't read RKW header",
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"Invalid RKW magic number",
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"RKW header CRC error",
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"RKW file too big",
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"RKW Load address mismatch",
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"Bad model number",
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"Error Reading File",
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"RKW firmware CRC error"
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};
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const char *rkw_strerror(int8_t errno)
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{
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if ((uint8_t)-errno >= sizeof(err_str)/sizeof(err_str[0]) || errno > 0)
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return "Unknown error";
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return err_str[-errno];
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}
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/* loosely based on load_firmware()
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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 rkw_strerror() function
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*/
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int load_rkw(unsigned char* buf, const char* filename, int buffer_size)
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{
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int fd;
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int rc;
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int len;
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int ret;
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uint32_t crc, fw_crc;
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struct rkw_header_t rkw_info;
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fd = open(filename, O_RDONLY);
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if(fd < 0)
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return -1;
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rc = read(fd, &rkw_info, sizeof(rkw_info));
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if (rc < (int)sizeof(rkw_info))
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{
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ret = -2;
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goto end;
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}
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/* check if RKW is valid */
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if (rkw_info.magic_number != RKLD_MAGIC)
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{
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ret = -3;
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goto end;
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}
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/* check header crc if present */
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if (rkw_info.load_options & RKW_HEADER_CRC)
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{
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crc = crc32_rkw((uint8_t *)&rkw_info, sizeof(rkw_info)-sizeof(uint32_t));
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if (rkw_info.crc != crc)
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{
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ret = -4;
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goto end;
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}
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}
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/* check image size */
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len = rkw_info.load_limit - rkw_info.load_address;
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if (len > buffer_size)
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{
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ret = -5;
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goto end;
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}
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/* check load address - we support loading only at 0x60000000 */
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if (rkw_info.load_address != 0x60000000)
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{
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ret = -6;
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goto end;
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}
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/* rockbox extension - we use one of reserved fields to store
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* model number information. This prevents from loading
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* rockbox RKW for different player.
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*/
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if (rkw_info.reserved0 != 0 && rkw_info.reserved0 != MODEL_NUMBER)
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{
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ret = -7;
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goto end;
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}
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/* skip header */
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lseek(fd, sizeof(rkw_info), SEEK_SET);
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/* load image into buffer */
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rc = read(fd, buf, len);
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if(rc < len)
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{
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ret = -8;
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goto end;
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}
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if (rkw_info.load_options & RKW_IMAGE_CRC)
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{
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rc = read(fd, &fw_crc, sizeof(uint32_t));
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crc = crc32_rkw((uint8_t *)buf, len);
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if (fw_crc != crc)
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{
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ret = -9;
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goto end;
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}
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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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