From bf309e08a79358315f773c8763133351cbc74152 Mon Sep 17 00:00:00 2001
From: slegouix <samuel.legouix@orange.com>
Date: Thu, 21 Mar 2024 15:33:22 +0100
Subject: [PATCH] add support for tags of 64 bits wide

---
 include/nanocbor/nanocbor.h | 12 ++++++++++++
 src/decoder.c               |  5 +++++
 2 files changed, 17 insertions(+)

diff --git a/include/nanocbor/nanocbor.h b/include/nanocbor/nanocbor.h
index 6ccf7d1..7ac8ac9 100644
--- a/include/nanocbor/nanocbor.h
+++ b/include/nanocbor/nanocbor.h
@@ -498,6 +498,18 @@ void nanocbor_leave_container(nanocbor_value_t *it,
  */
 int nanocbor_get_tag(nanocbor_value_t *cvalue, uint32_t *tag);
 
+/**
+ * @brief Retrieve a tag as positive uint64_t from the stream
+ *
+ * The resulting @p value is undefined if the result is an error condition
+ *
+ * @param[in]   cvalue  CBOR value to decode from
+ * @param[out]  tag     returned tag as positive integer
+ *
+ * @return              NANOCBOR_OK on success
+ */
+int nanocbor_get_tag64(nanocbor_value_t *cvalue, uint64_t *tag);
+
 /**
  * @brief Retrieve a null value from the stream
  *
diff --git a/src/decoder.c b/src/decoder.c
index de06302..5820659 100644
--- a/src/decoder.c
+++ b/src/decoder.c
@@ -271,6 +271,11 @@ int nanocbor_get_tag(nanocbor_value_t *cvalue, uint32_t *tag)
     return res;
 }
 
+int nanocbor_get_tag64(nanocbor_value_t *cvalue, uint64_t *tag)
+{
+    return _get_and_advance_uint64(cvalue, tag, NANOCBOR_TYPE_TAG);
+}
+
 int nanocbor_get_decimal_frac(nanocbor_value_t *cvalue, int32_t *e, int32_t *m)
 {
     int res = NANOCBOR_NOT_FOUND;