1 files changed, 57 insertions, 0 deletions
diff --git a/test/monniaux/BearSSL/src/int/i31_decode.c b/test/monniaux/BearSSL/src/int/i31_decode.c
new file mode 100644
index 00000000..8ec6d908
--- /dev/null
+++ b/test/monniaux/BearSSL/src/int/i31_decode.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining 
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be 
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "inner.h"
+
+/* see inner.h */
+void
+br_i31_decode(uint32_t *x, const void *src, size_t len)
+{
+	const unsigned char *buf;
+	size_t u, v;
+	uint32_t acc;
+	int acc_len;
+
+	buf = src;
+	u = len;
+	v = 1;
+	acc = 0;
+	acc_len = 0;
+	while (u -- > 0) {
+		uint32_t b;
+
+		b = buf[u];
+		acc |= (b << acc_len);
+		acc_len += 8;
+		if (acc_len >= 31) {
+			x[v ++] = acc & (uint32_t)0x7FFFFFFF;
+			acc_len -= 31;
+			acc = b >> (8 - acc_len);
+		}
+	}
+	if (acc_len != 0) {
+		x[v ++] = acc;
+	}
+	x[0] = br_i31_bit_length(x + 1, v - 1);
+}