Add libcbor; an implementation of the Concise Binary Object

Representation (CBOR) encoding format defined in RFC7049.

This is a dependency of libfido2, that we'll use for U2F/FIDO
support in OpenSSH.

feedback and "Looks good enough to me" deraadt@

1 files changed, 33 insertions, 0 deletions

diff --git a/lib/libcbor/src/cbor/internal/stack.c b/lib/libcbor/src/cbor/internal/stack.c
new file mode 100644
index 00000000000..65e15fe9379
--- /dev/null
+++ b/lib/libcbor/src/cbor/internal/stack.c
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2014-2017 Pavel Kalvoda <me@pavelkalvoda.com>
+ *
+ * libcbor is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See LICENSE for details.
+ */
+
+#include "stack.h"
+
+struct _cbor_stack _cbor_stack_init()
+{
+	return (struct _cbor_stack) {.top = NULL, .size = 0};
+}
+
+void _cbor_stack_pop(struct _cbor_stack *stack)
+{
+	struct _cbor_stack_record *top = stack->top;
+	stack->top = stack->top->lower;
+	_CBOR_FREE(top);
+	stack->size--;
+}
+
+struct _cbor_stack_record *_cbor_stack_push(struct _cbor_stack *stack, cbor_item_t *item, size_t subitems)
+{
+	struct _cbor_stack_record *new_top = _CBOR_MALLOC(sizeof(struct _cbor_stack_record));
+	if (new_top == NULL)
+		return NULL;
+
+	*new_top = (struct _cbor_stack_record) {stack->top, item, subitems};
+	stack->top = new_top;
+	stack->size++;
+	return new_top;
+}