+/*
+ * Copyright (C) 1995-2003, Index Data.
+ * See the file LICENSE for details.
+ * Sebastian Hammer, Adam Dickmeiss
+ *
+ * $Id: ber_len.c,v 1.12 2003-03-11 11:03:31 adam Exp $
+ */
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
+
#include <stdio.h>
-#include <odr.h>
+#include "odr-priv.h"
/*
* Encode BER length octets. If exact, lenlen is the exact desired
* Returns: =0 success, indefinite start-marker set. 1 byte encoded.
* Returns: -1 failure, out of bounds.
*/
-int ber_enclen(unsigned char *buf, int len, int lenlen, int exact)
+int ber_enclen(ODR o, int len, int lenlen, int exact)
{
- unsigned char *b = buf;
unsigned char octs[sizeof(int)];
int n = 0;
+ int lenpos, end;
+#ifdef ODR_DEBUG
fprintf(stderr, "[len=%d]", len);
+#endif
if (len < 0) /* Indefinite */
{
- *b = 0X80;
+ if (odr_putc(o, 0x80) < 0)
+ return 0;
+#ifdef ODR_DEBUG
fprintf(stderr, "[indefinite]");
+#endif
return 0;
}
if (len <= 127 && (lenlen == 1 || !exact)) /* definite short form */
{
- *b = len;
+ if (odr_putc(o, (unsigned char) len) < 0)
+ return 0;
return 1;
}
if (lenlen == 1)
{
- *b = 0X80;
+ if (odr_putc(o, 0x80) < 0)
+ return 0;
return 0;
}
/* definite long form */
while (len);
if (n >= lenlen)
return -1;
- b++;
+ lenpos = odr_tell(o); /* remember length-of-length position */
+ if (odr_putc(o, 0) < 0) /* dummy */
+ return 0;
if (exact)
while (n < --lenlen) /* pad length octets */
- *(++b) = 0;
+ if (odr_putc(o, 0) < 0)
+ return 0;
while (n--)
- *(b++) = octs[n];
- *buf = (b - buf - 1) | 0X80;
- return b - buf;
+ if (odr_putc(o, octs[n]) < 0)
+ return 0;
+ /* set length of length */
+ end = odr_tell(o);
+ odr_seek(o, ODR_S_SET, lenpos);
+ if (odr_putc(o, (end - lenpos - 1) | 0X80) < 0)
+ return 0;
+ odr_seek(o, ODR_S_END, 0);
+ return odr_tell(o) - lenpos;
}
/*
* len = -1 indefinite.
* len >= 0 Length.
*/
-int ber_declen(unsigned char *buf, int *len)
+int ber_declen(const unsigned char *buf, int *len, int max)
{
- unsigned char *b = buf;
+ const unsigned char *b = buf;
int n;
+ if (max < 1)
+ return -1;
if (*b == 0X80) /* Indefinite */
{
*len = -1;
+#ifdef ODR_DEBUG
fprintf(stderr, "[len=%d]", *len);
+#endif
return 1;
}
if (!(*b & 0X80)) /* Definite short form */
{
*len = (int) *b;
+#ifdef ODR_DEBUG
fprintf(stderr, "[len=%d]", *len);
+#endif
return 1;
}
if (*b == 0XFF) /* reserved value */
return -1;
/* indefinite long form */
n = *b & 0X7F;
+ if (n >= max)
+ return -1;
*len = 0;
b++;
- while (n--)
+ while (--n >= 0)
{
*len <<= 8;
*len |= *(b++);
}
+ if (*len < 0)
+ return -1;
+#ifdef ODR_DEBUG
fprintf(stderr, "[len=%d]", *len);
+#endif
return (b - buf);
}