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Add escape processing to txt_fromtext

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This commit is contained in:
Mark Andrews
1999-05-17 15:30:03 +00:00
parent 1d978b3ba2
commit 7d62ddffbb
1 changed files with 53 additions and 7 deletions
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60
lib/dns/rdata.c
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@@ -15,7 +15,7 @@
* SOFTWARE.
*/
/* $Id: rdata.c,v 1.43 1999/05/17 04:49:38 gson Exp $ */
/* $Id: rdata.c,v 1.44 1999/05/17 15:30:03 marka Exp $ */
#include <config.h>
@@ -715,15 +715,61 @@ txt_totext(isc_region_t *source, isc_buffer_t *target) {
static dns_result_t
txt_fromtext(isc_textregion_t *source, isc_buffer_t *target) {
isc_region_t tregion;
isc_boolean_t escape;
unsigned int n, nrem;
char *s;
unsigned char *t;
int d;
int c;
isc_buffer_available(target, &tregion);
if (tregion.length < source->length + 1)
s = source->base;
n = source->length;
t = target->base;
nrem = target->length;
escape = ISC_FALSE;
if (nrem < 1)
return (DNS_R_NOSPACE);
if (source->length > 255)
return (DNS_R_TEXTTOLONG);
*tregion.base = source->length;
memcpy(tregion.base + 1, source->base, source->length);
isc_buffer_add(target, source->length + 1);
/* Length byte. */
nrem--;
t++;
/* Maximum text string length. */
if (nrem > 255)
nrem = 255;
while (n-- != 0) {
c = (*s++)&0xff;
if (escape && (d = decvalue(c)) != -1) {
c = d;
if (n == 0)
return (DNS_R_SYNTAX);
n--;
if ((d = decvalue(*s++)) != -1)
c = c * 10 + d;
else
return (DNS_R_SYNTAX);
if (n == 0)
return (DNS_R_SYNTAX);
n--;
if ((d = decvalue(*s++)) != -1)
c = c * 10 + d;
else
return (DNS_R_SYNTAX);
if (c > 255)
return (DNS_R_SYNTAX);
} else if (!escape && c == '\\') {
escape = ISC_TRUE;
continue;
}
escape = ISC_FALSE;
if (nrem == 0)
return (DNS_R_NOSPACE);
*t++ = c;
nrem--;
}
if (escape)
return (DNS_R_SYNTAX);
*tregion.base = t - tregion.base - 1;
isc_buffer_add(target, *tregion.base + 1);
return (DNS_R_SUCCESS);
}