Port to CMake, get rid of os_int.h.

[stg.git] / libs / smux / include / stg / ber_tlv_tag.h

diff --git a/libs/smux/include/stg/ber_tlv_tag.h b/libs/smux/include/stg/ber_tlv_tag.h
new file mode 100644 (file)
index 0000000..60e8668
--- /dev/null
+++ b/libs/smux/include/stg/ber_tlv_tag.h
@@ -0,0 +1,60 @@
+/*-
+ * Copyright (c) 2003, 2004 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#ifndef        _BER_TLV_TAG_H_
+#define        _BER_TLV_TAG_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum asn_tag_class {
+       ASN_TAG_CLASS_UNIVERSAL         = 0,    /* 0b00 */
+       ASN_TAG_CLASS_APPLICATION       = 1,    /* 0b01 */
+       ASN_TAG_CLASS_CONTEXT           = 2,    /* 0b10 */
+       ASN_TAG_CLASS_PRIVATE           = 3     /* 0b11 */
+};
+typedef unsigned ber_tlv_tag_t;        /* BER TAG from Tag-Length-Value */
+
+/*
+ * Tag class is encoded together with tag value for optimization purposes.
+ */
+#define        BER_TAG_CLASS(tag)      ((tag) & 0x3)
+#define        BER_TAG_VALUE(tag)      ((tag) >> 2)
+#define        BER_TLV_CONSTRUCTED(tagptr)     (((*(const uint8_t *)tagptr)&0x20)?1:0)
+
+#define        BER_TAGS_EQUAL(tag1, tag2)      ((tag1) == (tag2))
+
+/*
+ * Several functions for printing the TAG in the canonical form
+ * (i.e. "[PRIVATE 0]").
+ * Return values correspond to their libc counterparts (if any).
+ */
+ssize_t ber_tlv_tag_snprint(ber_tlv_tag_t tag, char *buf, size_t buflen);
+ssize_t ber_tlv_tag_fwrite(ber_tlv_tag_t tag, FILE *);
+char *ber_tlv_tag_string(ber_tlv_tag_t tag);
+
+
+/*
+ * This function tries to fetch the tag from the input stream.
+ * RETURN VALUES:
+ *      0:     More data expected than bufptr contains.
+ *     -1:     Fatal error deciphering tag.
+ *     >0:     Number of bytes used from bufptr. tag_r will contain the tag.
+ */
+ssize_t ber_fetch_tag(const void *bufptr, size_t size, ber_tlv_tag_t *tag_r);
+
+/*
+ * This function serializes the tag (T from TLV) in BER format.
+ * It always returns number of bytes necessary to represent the tag,
+ * it is a caller's responsibility to check the return value
+ * against the supplied buffer's size.
+ */
+size_t ber_tlv_tag_serialize(ber_tlv_tag_t tag, void *bufptr, size_t size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _BER_TLV_TAG_H_ */