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authorwdenk <wdenk>2002-08-17 09:36:01 +0000
committerwdenk <wdenk>2002-08-17 09:36:01 +0000
commitaffae2bff825c1a8d2cfeaf7b270188d251d39d2 (patch)
treee025ca5a84cdcd70cff986e09f89e1aaa360499c /common/s_record.c
parentcf356ef708390102d493c53d18fd19a5963c6aa9 (diff)
downloadbarebox-affae2bff825c1a8d2cfeaf7b270188d251d39d2.tar.gz
Initial revision
Diffstat (limited to 'common/s_record.c')
-rw-r--r--common/s_record.c195
1 files changed, 195 insertions, 0 deletions
diff --git a/common/s_record.c b/common/s_record.c
new file mode 100644
index 0000000..c52bf1b
--- /dev/null
+++ b/common/s_record.c
@@ -0,0 +1,195 @@
+/*
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#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);
+}