98 lines
3.0 KiB
C
98 lines
3.0 KiB
C
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/*
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* Software License Agreement (BSD License)
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*
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* Copyright (c) 2010, Roel Verdult
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holders nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <stdio.h>
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#include <stdint.h>
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#define BLOCK_COUNT 7
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#define BLOCK_LENGTH 4
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#define BLOCK_TOTAL (BLOCK_COUNT*BLOCK_LENGTH)
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typedef unsigned char byte_t;
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int main(int argc, char *argv[])
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{
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FILE* pf;
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byte_t buf[BLOCK_TOTAL];
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uint32_t crc = 0;
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uint32_t block;
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// Check for required arguments
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if (argc < 2)
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{
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printf("syntax: lpcrc <firmware.bin>\n");
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return 1;
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}
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// Try to open the supplied firmware
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if ((pf = fopen(argv[1],"rb+")) == NULL)
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{
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printf("error: could not open file [%s] with write access\n",argv[1]);
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return 1;
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}
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// Read out the data blocks used for crc calculation
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if (fread(buf,1,BLOCK_TOTAL,pf) != BLOCK_TOTAL)
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{
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printf("error: could not read required bytes\n");
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fclose(pf);
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return 1;
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}
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// Compute the crc value
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for (block=0; block<BLOCK_COUNT; block++)
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{
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crc += *((uint32_t*)(buf+(block*BLOCK_LENGTH)));
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}
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crc = (~crc) + 1;
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// Reposition the file stream indicator to switch between read and write
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if (fseek(pf,0,SEEK_CUR) != 0)
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{
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printf("error: could not switch from read to write mode\n");
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fclose(pf);
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return 1;
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}
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// Write the crc back to the file
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if (fwrite((byte_t*)&crc,1,BLOCK_LENGTH,pf) != BLOCK_LENGTH)
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{
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printf("error: could not write crc back to file\n");
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fclose(pf);
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return 1;
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}
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printf("succesfully updated crc to: %08x\n",crc);
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fclose(pf);
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return 0;
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}
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