Newer
Older
/*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
*/
#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);
}