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u-boot/common/s_record.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

178 lines
3.5 KiB
C

// 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);
}