[PATCH] add hex en/decoding functions
Wilfried Goesgens <[email protected]>
| Newsgroups | gmane.comp.mobile.kannel.devel |
|---|---|
| Message-ID | <[email protected]> |
sometimes one must cope with converting numbers from hex to long, and vice versa. This is fine for the varous kinds of hex-pdus, encoding and decoding them. Wilfried Gösgens
add_hexfuncts.c.diff
(text/plain, 1.2 KB)
--- a/gateway/gwlib/octstr.c 2006-03-17 11:19:43.000000000 +0100
+++ b/gateway/gwlib/octstr.c 2006-04-03 16:00:36.000000000 +0200
@@ -735,6 +737,54 @@
}
+long octstr_hex_to_long(Octstr *ostr, int start, int end)
+{
+ int i;
+ long ret=0;
+
+ /* if the string is too long, not *2 because of we aren't signed. */
+ if (end==0) end=ostr->len;
+ /* this is bullshit. gw_assert(sizeof(long)<(end-start)); */
+
+
+ for(i=start; i<end; i++)
+ {
+ int hexc=0;
+ /* 0-9 */
+ hexc= toupper(ostr->data[i]) - 48;
+ /* A-F ? */
+ if (hexc > 9)
+ hexc -= 7;
+ /* none of the above? */
+ if ((hexc < 0) || (hexc > 15))
+ return -1;
+ ret=(ret<<4)|hexc;
+ }
+ /* success */
+ return ret;
+
+}
+
+Octstr *octstr_long_to_hex(long data, long digits)
+{
+#define FIELDLEN 255
+ long resi, rest, n;
+ char ch[FIELDLEN+1]; /* the \0 */
+
+ rest=data;
+ ch[FIELDLEN+1]='\0';
+ for (n=0; n<digits; n++)
+ {
+ resi=data%16;
+ if (resi >9)
+ ch[FIELDLEN-n]=55+resi;
+ else
+ ch[FIELDLEN-n]=(char)48+resi;
+ data=data/15;
+ }
+ return octstr_create(&ch[FIELDLEN-digits+1]);
+}
+
long octstr_parse_long(long *nump, Octstr *ostr, long pos, int base)
{
/* strtol wants a char *, and we have to compare the result to
add_hexfuncts.h.diff
(text/plain, 948 B)
--- a/gateway/gwlib/octstr.h 2006-02-23 02:25:17.000000000 +0100 +++ a/gateway/gwlib/octstr.h 2006-04-03 15:51:01.000000000 +0200 @@ -266,6 +265,19 @@ * encoding defined in RFC 2045. */ void octstr_base64_to_binary(Octstr *ostr); +/* Parse a hex ascii encoded number to its corrosponding long value + * start: where to start searching + * end: where to end searching. if 0 set to the length of octstr + */ +long octstr_hex_to_long(Octstr *ostr, int start, int end); + +/* convert a long value to a hexadecimal representation. + * data is the number to print, digits is the number of + * digits that will be used in the string. + * it works right to left, so the decimal point is the anchor + * digits is counted from. larger values will be cut. + */ +Octstr *octstr_long_to_hex( long data, long digits); /* Parse a number at position 'pos' in 'ostr', using the same rules as * strtol uses regarding 'base'. Skip leading whitespace.