Updates.

[yaz-moved-to-github.git] / odr / ber_bit.c

diff --git a/odr/ber_bit.c b/odr/ber_bit.c
new file mode 100644 (file)
index 0000000..ce8e21a
--- /dev/null
+++ b/odr/ber_bit.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 1994, Index Data I/S 
+ * All rights reserved.
+ * Sebastian Hammer, Adam Dickmeiss
+ *
+ * $Log: ber_bit.c,v $
+ * Revision 1.1  1995-02-02 20:38:49  quinn
+ * Updates.
+ *
+ *
+ */
+
+#include <odr.h>
+
+int ber_bitstring(ODR o, ODR_BITMASK *p, int cons)
+{
+    int res, len;
+    unsigned char *base;
+
+    switch (o->direction)
+    {
+       case ODR_DECODE:
+           if ((res = ber_declen(o->bp, &len)) < 0)
+               return 0;
+           o->bp += res;
+           o->left -= res;
+           if (cons)       /* fetch component strings */
+           {
+               base = o->bp;
+               while (odp_more_chunks(o, base, len))
+                   if (!odr_bitstring(o, &p, 0))
+                       return 0;
+               return 1;
+           }
+           /* primitive bitstring */
+           if (len < 0)
+               return 0;
+           if (len == 0)
+               return 1;
+           if (len - 1 > ODR_BITMASK_SIZE)
+               return 0;
+           o->bp++;      /* silently ignore the unused-bits field */
+           o->left--;
+           len--;
+           memcpy(p->bits + p->top + 1, o->bp, len);
+           p->top += len;
+           o->bp += len;
+           o->left -= len;
+           return 1;
+       case ODR_ENCODE:
+           if ((res = ber_enclen(o->bp, p->top + 2, 5, 0)) < 0)
+               return 0;
+           o->bp += res;
+           o->left -= res;
+           if (p->top + 2 > o->left)
+               return 0;
+           *(o->bp++) = 0;    /* no unused bits here */
+           o->left--;
+           if (p->top < 0)
+               return 1;
+           memcpy(o->bp, p->bits, p->top + 1);
+           o->bp += p->top + 1;
+           o->left -= p->top +1;
+           return 1;
+       case ODR_PRINT: return 1;
+       default: return 0;
+    }
+}