116 lines
2.8 KiB
C
116 lines
2.8 KiB
C
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/***************************************************************************
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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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*
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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 "rb-loader.h"
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#include "loader_strerror.h"
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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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char filename[MAX_PATH];
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int fd;
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int rc;
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int len;
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int ret = 0;
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unsigned long chksum;
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unsigned long sum;
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int i;
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/* only filename passed */
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if (firmware[0] != '/')
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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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fd = open(filename, O_RDONLY);
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if(fd < 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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fd = open(filename, O_RDONLY);
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if (fd < 0)
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return EFILE_NOT_FOUND;
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}
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}
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else
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{
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/* full path passed */
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fd = open(firmware, O_RDONLY);
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if (fd < 0)
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return EFILE_NOT_FOUND;
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}
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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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rc = read(fd, &chksum, 4);
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chksum = betoh32(chksum); /* Rockbox checksums are big-endian */
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if(rc < 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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lseek(fd, FIRMWARE_OFFSET_FILE_DATA, SEEK_SET);
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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 = EREAD_IMAGE_FAILED;
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goto end;
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}
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sum = MODEL_NUMBER;
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for(i = 0;i < len;i++)
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{
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sum += buf[i];
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}
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if(sum != chksum)
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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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