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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2000
- * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- */
- #include <common.h>
- #include <s_record.h>
- static int hex1_bin (char c);
- static int hex2_bin (char *s);
- int srec_decode (char *input, int *count, ulong *addr, char *data)
- {
- int i;
- int v; /* conversion buffer */
- int srec_type; /* S-Record type */
- unsigned char chksum; /* buffer for checksum */
- chksum = 0;
- /* skip anything before 'S', and the 'S' itself.
- * Return error if not found
- */
- for (; *input; ++input) {
- if (*input == 'S') { /* skip 'S' */
- ++input;
- break;
- }
- }
- if (*input == '\0') { /* no more data? */
- return (SREC_EMPTY);
- }
- v = *input++; /* record type */
- if ((*count = hex2_bin(input)) < 0) {
- return (SREC_E_NOSREC);
- }
- chksum += *count;
- input += 2;
- switch (v) { /* record type */
- case '0': /* start record */
- srec_type = SREC_START; /* 2 byte addr field */
- *count -= 3; /* - checksum and addr */
- break;
- case '1':
- srec_type = SREC_DATA2; /* 2 byte addr field */
- *count -= 3; /* - checksum and addr */
- break;
- case '2':
- srec_type = SREC_DATA3; /* 3 byte addr field */
- *count -= 4; /* - checksum and addr */
- break;
- case '3': /* data record with a */
- srec_type = SREC_DATA4; /* 4 byte addr field */
- *count -= 5; /* - checksum and addr */
- break;
- /*** case '4' ***/
- case '5': /* count record, addr field contains */
- srec_type = SREC_COUNT; /* a 2 byte record counter */
- *count = 0; /* no data */
- break;
- /*** case '6' -- not used ***/
- case '7': /* end record with a */
- srec_type = SREC_END4; /* 4 byte addr field */
- *count -= 5; /* - checksum and addr */
- break;
- case '8': /* end record with a */
- srec_type = SREC_END3; /* 3 byte addr field */
- *count -= 4; /* - checksum and addr */
- break;
- case '9': /* end record with a */
- srec_type = SREC_END2; /* 2 byte addr field */
- *count -= 3; /* - checksum and addr */
- break;
- default:
- return (SREC_E_BADTYPE);
- }
- /* read address field */
- *addr = 0;
- switch (v) {
- case '3': /* 4 byte addr field */
- case '7':
- if ((v = hex2_bin(input)) < 0) {
- return (SREC_E_NOSREC);
- }
- *addr += v;
- chksum += v;
- input += 2;
- /* FALL THRU */
- case '2': /* 3 byte addr field */
- case '8':
- if ((v = hex2_bin(input)) < 0) {
- return (SREC_E_NOSREC);
- }
- *addr <<= 8;
- *addr += v;
- chksum += v;
- input += 2;
- /* FALL THRU */
- case '0': /* 2 byte addr field */
- case '1':
- case '5':
- case '9':
- if ((v = hex2_bin(input)) < 0) {
- return (SREC_E_NOSREC);
- }
- *addr <<= 8;
- *addr += v;
- chksum += v;
- input += 2;
- if ((v = hex2_bin(input)) < 0) {
- return (SREC_E_NOSREC);
- }
- *addr <<= 8;
- *addr += v;
- chksum += v;
- input += 2;
- break;
- default:
- return (SREC_E_BADTYPE);
- }
- /* convert data and calculate checksum */
- for (i=0; i < *count; ++i) {
- if ((v = hex2_bin(input)) < 0) {
- return (SREC_E_NOSREC);
- }
- data[i] = v;
- chksum += v;
- input += 2;
- }
- /* read anc check checksum */
- if ((v = hex2_bin(input)) < 0) {
- return (SREC_E_NOSREC);
- }
- if ((unsigned char)v != (unsigned char)~chksum) {
- return (SREC_E_BADCHKS);
- }
- return (srec_type);
- }
- static int hex1_bin (char c)
- {
- if (c >= '0' && c <= '9')
- return (c - '0');
- if (c >= 'a' && c <= 'f')
- return (c + 10 - 'a');
- if (c >= 'A' && c <= 'F')
- return (c + 10 - 'A');
- return (-1);
- }
- static int hex2_bin (char *s)
- {
- int i, j;
- if ((i = hex1_bin(*s++)) < 0) {
- return (-1);
- }
- if ((j = hex1_bin(*s)) < 0) {
- return (-1);
- }
- return ((i<<4) + j);
- }
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