Ability to reset an encoder

src/cbor.h

@@ -208,6 +208,7 @@ struct CborEncoder
         uint8_t *ptr;
         ptrdiff_t bytes_needed;
     } data;
+    uint8_t *start;
     const uint8_t *end;
     size_t remaining;
     int flags;
@@ -228,6 +229,7 @@ CBOR_INLINE_API CborError cbor_encode_text_stringz(CborEncoder *encoder, const c
 CBOR_API CborError cbor_encode_byte_string(CborEncoder *encoder, const uint8_t *string, size_t length);
 CBOR_API CborError cbor_encode_floating_point(CborEncoder *encoder, CborType fpType, const void *value);
 
+
 CBOR_INLINE_API CborError cbor_encode_boolean(CborEncoder *encoder, bool value)
 { return cbor_encode_simple_value(encoder, (int)value - 1 + (CborBooleanType & 0x1f)); }
 CBOR_INLINE_API CborError cbor_encode_null(CborEncoder *encoder)
@@ -262,6 +264,9 @@ CBOR_INLINE_API size_t cbor_encoder_get_extra_bytes_needed(const CborEncoder *en
     return encoder->end ? 0 : (size_t)encoder->data.bytes_needed;
 }
 
+CBOR_INLINE_API void cbor_encoder_reset(CborEncoder *encoder)
+{ encoder->data.ptr = encoder->start; }
+
 /* Parser API */
 
 enum CborParserIteratorFlags

src/cborencoder.c

@@ -203,6 +203,7 @@
 void cbor_encoder_init(CborEncoder *encoder, uint8_t *buffer, size_t size, int flags)
 {
     encoder->data.ptr = buffer;
+    encoder->start = buffer;
     encoder->end = buffer + size;
     encoder->remaining = 2;
     encoder->flags = flags;
@@ -433,7 +434,7 @@ static CborError encode_string(CborEncoder *encoder, size_t length, uint8_t shif
  */
 
 /**
- * Appends the text string \a string of length \a length to the CBOR stream
+ * Appends the byte string \a string of length \a length to the CBOR stream
  * provided by \a encoder. CBOR requires that \a string be valid UTF-8, but
  * TinyCBOR makes no verification of correctness.
  *
@@ -445,7 +446,7 @@ CborError cbor_encode_byte_string(CborEncoder *encoder, const uint8_t *string, s
 }
 
 /**
- * Appends the byte string \a string of length \a length to the CBOR stream
+ * Appends the text string \a string of length \a length to the CBOR stream
  * provided by \a encoder. CBOR byte strings are arbitrary raw data.
  *
  * \sa cbor_encode_text_stringz, cbor_encode_text_string
@@ -642,4 +643,13 @@ CborError cbor_encoder_close_container(CborEncoder *encoder, const CborEncoder *
  * \sa cbor_encoder_init(), cbor_encoder_get_buffer_size(), CborEncoding
  */
 
+/**
+ * \fn void cbor_encoder_reset(CborEncoder *encoder)
+ *
+ * Reset the encoder. The encoder will now start writing from the beginning of
+ * its allocated buffer space.
+ *
+ * \sa cbor_encoder_init
+ */
+
 /** @} */