srecutils.cpp

00001 /*******************************************************************************
00002 
00003 srecutils.h
00004 (c) 2010 by Sophie Dexter
00005 
00006 Functions for manipulating Motorala S-records
00007 
00008 ********************************************************************************
00009 
00010 WARNING: Use at your own risk, sadly this software comes with no guarantees.
00011 This software is provided 'free' and in good faith, but the author does not
00012 accept liability for any damage arising from its use.
00013 
00014 *******************************************************************************/
00015 
00016 #include "srecutils.h"
00017 
00018 // SRecGetByte
00019 //
00020 // Returns an int which is a single byte made up from two ascii characters read from an S-record file
00021 //
00022 // inputs:    a file pointer for the S-record file
00023 // return:    an integer which is the byte in hex format
00024 
00025 int SRecGetByte(FILE *fp) {
00026     int c = 0;
00027     int retbyte = 0;
00028 
00029     for(int i=0; i<2; i++) {
00030         if ((c = fgetc(fp)) == EOF) return -1;
00031         c -= (c > '9') ? ('A' - 10) : '0';
00032         retbyte = (retbyte << 4) + c;
00033     }
00034     return retbyte;
00035 }
00036 
00037 // SRecGetAddress
00038 //
00039 // Returns an int which is the address part of the S-record line
00040 // The S-record type 1/2/3 or 9/8/7 determines if there are 2, 3 or 4 bytes in the address
00041 //
00042 // inputs:    an integer which is the number of bytes that make up the address; 2, 3 or 4 bytes
00043 //            a file pointer for the S-record file
00044 // return:    an integer which is the load address for the S-record
00045 
00046 int SRecGetAddress(int size, FILE *fp) {
00047     int address = 0;
00048     for (int i = 0; i<size; i++)
00049     {
00050         address <<= 8;
00051         address |= SRecGetByte (fp);
00052     }
00053     return address;
00054 }