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/****************************************************************************
* hn70ap/src/bootloader_tlv.c
*
* Copyright (C) 2018 Sebastien Lorquet. All rights reserved.
* Author: Sebastien Lorquet <sebastien@lorquet.fr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <stdint.h>
#include <stddef.h>
#include "bootloader.h"
#include "bootloader_tlv.h"
BOOTCODE static uint32_t bootloader_tlv_parse(uint8_t *buf, uint32_t buflen, uint32_t *foundtag, uint32_t *foundlen)
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{
uint32_t off=0;
uint32_t tag,len;
/*skip zeros while checking overflow*/
while(buf[off]==0 && off < buflen)
{
off++;
}
if(off==buflen)
{
return 0;
}
/*read tag*/
tag = buf[off];
off++;
if(off == buflen)
{
return 0;
}
if(tag == 0xFF)
{
//FF tag is normally valid but we reject it (erased mem)
return 0;
}
if( (tag&0x1F)==0x1F)
{
tag <<= 8;
tag |= buf[off];
off++;
if(off == buflen)
{
return 0;
}
}
/* read len */
len = buf[off];
off++;
if(off == buflen)
{
return 0;
}
if(len>0x84)
{
//Invalid length
return 0;
}
if(len>0x7F)
{
uint32_t lenlen = len & 0x7F;
len = 0;
while(lenlen>0 && off!=buflen)
{
len <<= 8;
len |= buf[off];
off++;
lenlen--;
}
if(off == buflen)
{
return 0;
}
}
/* check overflow */
if(len+off > buflen)
{
return 0;
}
/* return data */
*foundtag = tag;
*foundlen = len;
return off;
}
/*----------------------------------------------------------------------------*/
/*
Description: - return length and pointer to required tag, or null if not found
*/
BOOTCODE uint8_t *bootloader_tlv_find(uint8_t *buf, uint32_t buflen, uint32_t searchtag, uint32_t *foundlen, int recurse)
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{
uint32_t off;
uint32_t tmptag, tmplen;
uint8_t *content;
uint8_t *ptr = buf;
uint32_t len = buflen;
while(len>0)
{
off = bootloader_tlv_parse(ptr, len, &tmptag, &tmplen);
if(off)
{
/* a tag was found */
if (tmptag==searchtag)
{
/* correct tag, return */
*foundlen = tmplen;
return ptr+off;
}
else
{
/* not the correct tag. Recurse if composite and requested */
if( ( (tmptag & 0x20) == 0x20) && (recurse > 0) )
{
/* the tag is composite and recursion is allowed */
content = bootloader_tlv_find(ptr + off, tmplen, searchtag, foundlen, recurse - 1);
if (content)
{
return content; /* recursion has found the tag */
}
}
}
}
else
{
//parser returned zero, so not valid.
return NULL;
}
/* look at next tag */
ptr += off + tmplen;
len -= off + tmplen;
}
return NULL;
}