Some cleanups (removed unused files, split i15 code into per-function files).

[BearSSL] / src / int / i15_decode.c

diff --git a/src/int/i15_decode.c b/src/int/i15_decode.c
new file mode 100644 (file)
index 0000000..fc2c0be
--- /dev/null
+++ b/src/int/i15_decode.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2017 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_i15_decode(uint16_t *x, const void *src, size_t len)
+{
+       const unsigned char *buf;
+       size_t v;
+       uint32_t acc;
+       int acc_len;
+
+       buf = src;
+       v = 1;
+       acc = 0;
+       acc_len = 0;
+       while (len -- > 0) {
+               uint32_t b;
+
+               b = buf[len];
+               acc |= (b << acc_len);
+               acc_len += 8;
+               if (acc_len >= 15) {
+                       x[v ++] = acc & 0x7FFF;
+                       acc_len -= 15;
+                       acc >>= 15;
+               }
+       }
+       if (acc_len != 0) {
+               x[v ++] = acc;
+       }
+       x[0] = br_i15_bit_length(x + 1, v - 1);
+}