Source restructure. yaz-marcdump part of installation

[yaz-moved-to-github.git] / src / ber_tag.c

diff --git a/src/ber_tag.c b/src/ber_tag.c
new file mode 100644 (file)
index 0000000..19c412f
--- /dev/null
+++ b/src/ber_tag.c
@@ -0,0 +1,186 @@
+/*
+ * Copyright (c) 1995-2003, Index Data
+ * See the file LICENSE for details.
+ * Sebastian Hammer, Adam Dickmeiss
+ *
+ * $Id: ber_tag.c,v 1.1 2003-10-27 12:21:30 adam Exp $
+ */
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include "odr-priv.h"
+
+/* ber_tag
+ * On encoding:
+ *     if  p: write tag. return 1 (success) or -1 (error).
+ *     if !p: return 0.
+ * On decoding:
+ *      if tag && zclass match up, advance pointer and return 1. set cons.
+ *      else leave pointer unchanged. Return 0.
+ *
+ * Should perhaps be odr_tag?
+ */
+int ber_tag(ODR o, void *p, int zclass, int tag, int *constructed, int opt,
+            const char *name)
+{
+    struct Odr_ber_tag *odr_ber_tag = &o->op->odr_ber_tag;
+    int rd;
+    char **pp = (char **)p;
+
+    if (o->direction == ODR_DECODE)
+       *pp = 0;
+    o->t_class = -1;
+    if (o->op->stackp < 0)
+    {
+       odr_seek(o, ODR_S_SET, 0);
+        o->top = 0;
+       o->bp = o->buf;
+        odr_ber_tag->lclass = -1;
+    }
+    switch (o->direction)
+    {
+    case ODR_ENCODE:
+        if (!*pp)
+        {
+            if (!opt)
+            {
+                odr_seterror(o, OREQUIRED, 24);
+                odr_setelement (o, name);
+            }
+            return 0;
+        }
+        if ((rd = ber_enctag(o, zclass, tag, *constructed)) < 0)
+            return -1;
+#ifdef ODR_DEBUG
+        fprintf(stderr, "\n[class=%d,tag=%d,cons=%d,stackp=%d]", zclass, tag,
+                *constructed, o->stackp);
+#endif
+        return 1;
+        
+    case ODR_DECODE:
+        if (o->op->stackp > -1 && !odr_constructed_more(o))
+        {
+            if (!opt)
+            {
+                odr_seterror(o, OREQUIRED, 25);
+                odr_setelement(o, name);
+            }
+            return 0;
+        }
+        if (odr_ber_tag->lclass < 0)
+        {
+            if ((odr_ber_tag->br =
+                 ber_dectag(o->bp, &odr_ber_tag->lclass,
+                            &odr_ber_tag->ltag, &odr_ber_tag->lcons,
+                            odr_max(o))) <= 0)
+            {
+                odr_seterror(o, OPROTO, 26);
+                odr_setelement(o, name);
+                return 0;
+            }
+#ifdef ODR_DEBUG
+            fprintf(stderr,
+                    "\n[class=%d,tag=%d,cons=%d,stackp=%d]",
+                    odr_ber_tag->lclass, odr_ber_tag->ltag,
+                    odr_ber_tag->lcons, o->stackp);
+#endif
+        }
+        if (zclass == odr_ber_tag->lclass && tag == odr_ber_tag->ltag)
+        {
+            o->bp += odr_ber_tag->br;
+            *constructed = odr_ber_tag->lcons;
+            odr_ber_tag->lclass = -1;
+            return 1;
+        }
+        else
+        {
+            if (!opt)
+            {
+                odr_seterror(o, OREQUIRED, 27);
+                odr_setelement(o, name);
+            }
+            return 0;
+        }
+    case ODR_PRINT:
+        if (!*pp && !opt)
+        {
+            odr_seterror(o,OREQUIRED, 28);
+            odr_setelement(o, name);
+        }
+        return *pp != 0;
+    default:
+        odr_seterror(o, OOTHER, 29);
+        odr_setelement(o, name);
+        return 0;
+    }
+}
+
+/* ber_enctag
+ * BER-encode a zclass/tag/constructed package (identifier octets). Return
+ * number of bytes encoded, or -1 if out of bounds.
+ */
+int ber_enctag(ODR o, int zclass, int tag, int constructed)
+{
+    int cons = (constructed ? 1 : 0), n = 0;
+    unsigned char octs[sizeof(int)], b;
+
+    b = (zclass << 6) & 0XC0;
+    b |= (cons << 5) & 0X20;
+    if (tag <= 30)
+    {
+       b |= tag & 0X1F;
+       if (odr_putc(o, b) < 0)
+           return -1;
+       return 1;
+    }
+    else
+    {
+       b |= 0X1F;
+       if (odr_putc(o, b) < 0)
+           return -1;
+       do
+       {
+           octs[n++] = tag & 0X7F;
+           tag >>= 7;
+       }
+       while (tag);
+       while (n--)
+       {
+           unsigned char oo;
+
+           oo = octs[n] | ((n > 0) << 7);
+           if (odr_putc(o, oo) < 0)
+               return -1;
+       }
+       return 0;
+    }
+}
+
+/* ber_dectag
+ * Decode BER identifier octets. Return number of bytes read or -1 for error.
+ */
+int ber_dectag(const unsigned char *b, int *zclass, int *tag,
+               int *constructed, int max)
+{
+    int l = 1;
+
+    if (l > max)
+        return -1;
+
+    *zclass = *b >> 6;
+    *constructed = (*b >> 5) & 0X01;
+    if ((*tag = *b & 0x1F) <= 30)
+       return 1;
+    *tag = 0;
+    do
+    {
+        if (l >= max)
+            return -1;
+       *tag <<= 7;
+       *tag |= b[l] & 0X7F;
+    }
+    while (b[l++] & 0X80);
+    return l;
+}