Add str2bytes func for converting hexadecimal string to bytes:
"abcd a AA:BB" -> { 0xab 0xcd 0x0a 0xaa 0xbb }
It is needed to be used when specifying protocol payload for
trafgen proto command line.
Signed-off-by: Vadim Kochan <[email protected]>
---
str.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
str.h | 1 +
2 files changed, 65 insertions(+)
diff --git a/str.c b/str.c
index ec221af..3fac290 100644
--- a/str.c
+++ b/str.c
@@ -5,6 +5,7 @@
*/
#include <stdio.h>
+#include <ctype.h>
#include <string.h>
#include <stdarg.h>
@@ -109,3 +110,66 @@ char *cmdline_args2str(int from_idx, int argc, char **argv)
return str;
}
+
+static int strhex_bytes_len(char *str)
+{
+ int count = 0;
+
+ for (; *str; str++) {
+ if (!isxdigit(*str))
+ continue;
+
+ if (isxdigit(*(str + 1)))
+ str++;
+
+ count++;
+ }
+
+ return count;
+}
+
+static uint8_t char2hex(char c)
+{
+ int i;
+ const char *hex = "0123456789abcdef";
+ const char *hex_upper = "0123456789ABCDEF";
+
+ if (c >= 'A' && c <= 'F')
+ hex = hex_upper;
+
+ for (i = 0; i < 16; i++)
+ if (c == hex[i])
+ return i;
+
+ return 0;
+}
+
+int str2bytes(char *str, uint8_t **bytes)
+{
+ int i;
+ int bytes_len;
+ uint8_t *byte;
+
+ if (!str || !*str)
+ return 0;
+
+ bytes_len = strhex_bytes_len(str);
+ byte = *bytes = xzmalloc(bytes_len);
+
+ for (; *str; str++) {
+ if (!isxdigit(*str))
+ continue;
+
+ if (isxdigit(*(str + 1))) {
+ *byte = (char2hex(*str) << 4) | char2hex(*(str + 1));
+ str++;
+ } else {
+ *byte = char2hex(*str);
+ }
+
+ byte++;
+ i++;
+ }
+
+ return bytes_len;
+}
diff --git a/str.h b/str.h
index 56456a0..9db4850 100644
--- a/str.h
+++ b/str.h
@@ -9,5 +9,6 @@ extern int slprintf_nocheck(char *dst, size_t size, const char
*fmt, ...);
extern char *strtrim_right(char *p, char c);
extern noinline void *xmemset(void *s, int c, size_t n);
extern char *cmdline_args2str(int from_idx, int argc, char **argv);
+extern int str2bytes(char *str, uint8_t **bytes);
#endif /* STR_H */
--
2.4.2
--
You received this message because you are subscribed to the Google Groups
"netsniff-ng" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
