FreeCalypso > hg > freecalypso-tools
view loadtools/srecreader.c @ 921:74d284add54d
fc-fsio: guard against bogus readdir results from the target
If the FFS being operated on contains SE K2x0 extended filenames,
readdir will return strings that are bad for printing. We need to
guard against this possibility, and also against possible other
bogosity that could be sent by other alien firmwares.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 31 Dec 2022 22:55:23 +0000 |
parents | e7502631a0f9 |
children |
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line source
/* * This module contains the functions for reading S-record files. */ #include <sys/types.h> #include <stdint.h> #include <stdio.h> #include <ctype.h> #include <strings.h> #include "srecreader.h" open_srec_file(sr) struct srecreader *sr; { sr->openfile = fopen(sr->filename, "r"); if (!sr->openfile) { perror(sr->filename); return(-1); } sr->lineno = 0; return(0); } static srec2bin(sr, asciiline) struct srecreader *sr; char *asciiline; { register int i, l, b; l = decode_hex_byte(asciiline + 2); if (l < 1) { fprintf(stderr, "%s line %d: S-record length octet is bad\n", sr->filename, sr->lineno); return(-1); } sr->record[0] = l; for (i = 1; i <= l; i++) { b = decode_hex_byte(asciiline + i*2 + 2); if (b < 0) { fprintf(stderr, "%s line %d: S-record hex decode error\n", sr->filename, sr->lineno); return(-1); } sr->record[i] = b; } return(0); } static srec_cksum(sr) struct srecreader *sr; { u_char accum; register int i, len; len = sr->record[0] + 1; accum = 0; for (i = 0; i < len; i++) accum += sr->record[i]; if (accum != 0xFF) { fprintf(stderr, "%s line %d: bad S-record checksum\n", sr->filename, sr->lineno); return(-1); } return(0); } read_s_record(sr) struct srecreader *sr; { char asciiline[1024]; if (!fgets(asciiline, sizeof asciiline, sr->openfile)) { fprintf(stderr, "%s: premature EOF after %d S-records\n", sr->filename, sr->lineno); return(-1); } sr->lineno++; if (asciiline[0] != 'S' || !isdigit(asciiline[1])) { fprintf(stderr, "%s line %d: S-record expected\n", sr->filename, sr->lineno); return(-1); } sr->record_type = asciiline[1]; if (srec2bin(sr, asciiline) < 0) return(-1); return srec_cksum(sr); } s3s7_get_addr_data(sr) struct srecreader *sr; { if (sr->record[0] < 5) { fprintf(stderr, "%s line %d: S%c record is too short\n", sr->filename, sr->lineno, sr->record_type); return(-1); } sr->datalen = sr->record[0] - 5; sr->addr = ((uint32_t)sr->record[1] << 24) | ((uint32_t)sr->record[2] << 16) | ((uint32_t)sr->record[3] << 8) | (uint32_t)sr->record[4]; return(0); }