mirror of
https://github.com/u-boot/u-boot.git
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196 lines
4.3 KiB
C
196 lines
4.3 KiB
C
/*
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* (C) Copyright 2000
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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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 as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <s_record.h>
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static int hex1_bin (char c);
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static int hex2_bin (char *s);
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int srec_decode (char *input, int *count, ulong *addr, char *data)
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{
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int i;
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int v; /* conversion buffer */
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int srec_type; /* S-Record type */
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unsigned char chksum; /* buffer for checksum */
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chksum = 0;
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/* skip anything before 'S', and the 'S' itself.
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* Return error if not found
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*/
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for (; *input; ++input) {
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if (*input == 'S') { /* skip 'S' */
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++input;
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break;
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}
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}
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if (*input == '\0') { /* no more data? */
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return (SREC_EMPTY);
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}
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v = *input++; /* record type */
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if ((*count = hex2_bin(input)) < 0) {
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return (SREC_E_NOSREC);
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}
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chksum += *count;
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input += 2;
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switch (v) { /* record type */
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case '0': /* start record */
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srec_type = SREC_START; /* 2 byte addr field */
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*count -= 3; /* - checksum and addr */
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break;
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case '1':
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srec_type = SREC_DATA2; /* 2 byte addr field */
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*count -= 3; /* - checksum and addr */
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break;
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case '2':
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srec_type = SREC_DATA3; /* 3 byte addr field */
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*count -= 4; /* - checksum and addr */
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break;
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case '3': /* data record with a */
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srec_type = SREC_DATA4; /* 4 byte addr field */
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*count -= 5; /* - checksum and addr */
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break;
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/*** case '4' ***/
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case '5': /* count record, addr field contains */
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srec_type = SREC_COUNT; /* a 2 byte record counter */
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*count = 0; /* no data */
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break;
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/*** case '6' -- not used ***/
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case '7': /* end record with a */
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srec_type = SREC_END4; /* 4 byte addr field */
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*count -= 5; /* - checksum and addr */
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break;
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case '8': /* end record with a */
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srec_type = SREC_END3; /* 3 byte addr field */
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*count -= 4; /* - checksum and addr */
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break;
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case '9': /* end record with a */
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srec_type = SREC_END2; /* 2 byte addr field */
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*count -= 3; /* - checksum and addr */
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break;
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default:
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return (SREC_E_BADTYPE);
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}
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/* read address field */
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*addr = 0;
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switch (v) {
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case '3': /* 4 byte addr field */
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case '7':
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if ((v = hex2_bin(input)) < 0) {
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return (SREC_E_NOSREC);
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}
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*addr += v;
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chksum += v;
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input += 2;
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/* FALL THRU */
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case '2': /* 3 byte addr field */
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case '8':
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if ((v = hex2_bin(input)) < 0) {
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return (SREC_E_NOSREC);
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}
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*addr <<= 8;
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*addr += v;
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chksum += v;
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input += 2;
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/* FALL THRU */
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case '0': /* 2 byte addr field */
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case '1':
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case '5':
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case '9':
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if ((v = hex2_bin(input)) < 0) {
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return (SREC_E_NOSREC);
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}
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*addr <<= 8;
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*addr += v;
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chksum += v;
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input += 2;
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if ((v = hex2_bin(input)) < 0) {
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return (SREC_E_NOSREC);
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}
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*addr <<= 8;
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*addr += v;
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chksum += v;
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input += 2;
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break;
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default:
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return (SREC_E_BADTYPE);
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}
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/* convert data and calculate checksum */
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for (i=0; i < *count; ++i) {
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if ((v = hex2_bin(input)) < 0) {
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return (SREC_E_NOSREC);
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}
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data[i] = v;
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chksum += v;
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input += 2;
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}
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/* read anc check checksum */
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if ((v = hex2_bin(input)) < 0) {
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return (SREC_E_NOSREC);
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}
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if ((unsigned char)v != (unsigned char)~chksum) {
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return (SREC_E_BADCHKS);
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}
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return (srec_type);
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}
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static int hex1_bin (char c)
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{
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if (c >= '0' && c <= '9')
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return (c - '0');
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if (c >= 'a' && c <= 'f')
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return (c + 10 - 'a');
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if (c >= 'A' && c <= 'F')
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return (c + 10 - 'A');
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return (-1);
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}
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static int hex2_bin (char *s)
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{
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int i, j;
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if ((i = hex1_bin(*s++)) < 0) {
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return (-1);
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}
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if ((j = hex1_bin(*s)) < 0) {
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return (-1);
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}
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return ((i<<4) + j);
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}
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