Diff: src/misc.c

Revision:

0:c4152c628df5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/misc.c	Mon Nov 25 14:24:05 2019 +0000
@@ -0,0 +1,118 @@
+/* misc.c
+ *
+ * Copyright (C) 2014-2016 wolfSSL Inc.
+ *
+ * This file is part of wolfSSH.
+ *
+ * wolfSSH is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * wolfSSH is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wolfSSH.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * The misc module contains inline functions. This file is either included
+ * into source files or built separately depending on the inline configure
+ * option.
+ */
+
+
+#ifdef HAVE_CONFIG_H
+    #include <config.h>
+#endif
+
+
+#include <wolfssh/settings.h>
+
+
+#ifndef WOLFSSH_MISC_C
+#define WOLFSSH_MISC_C
+
+
+#include <wolfssh/misc.h>
+
+
+#ifdef NO_INLINE
+    #define STATIC
+#else
+    #define STATIC static
+#endif
+
+
+/* Check for if compiling misc.c when not needed. */
+#if !defined(WOLFSSH_MISC_INCLUDED) && !defined(NO_INLINE)
+    #define MISC_WARNING "misc.c does not need to be compiled when using inline (NO_INLINE not defined))"
+
+    #ifndef _MSC_VER
+        #warning MISC_WARNING
+    #else
+        #pragma message("warning: " MISC_WARNING)
+    #endif
+
+#else /* !WOLFSSL_MISC_INCLUDED && !NO_INLINE */
+
+
+#ifndef min
+STATIC INLINE word32 min(word32 a, word32 b)
+{
+    return a > b ? b : a;
+}
+#endif /* min */
+
+
+/* convert opaque to 32 bit integer */
+STATIC INLINE void ato32(const byte* c, word32* u32)
+{
+    *u32 = (c[0] << 24) | (c[1] << 16) | (c[2] << 8) | c[3];
+}
+
+
+/* convert 32 bit integer to opaque */
+STATIC INLINE void c32toa(word32 u32, byte* c)
+{
+    c[0] = (u32 >> 24) & 0xff;
+    c[1] = (u32 >> 16) & 0xff;
+    c[2] = (u32 >>  8) & 0xff;
+    c[3] =  u32 & 0xff;
+}
+
+
+/* Make sure compiler doesn't skip */
+STATIC INLINE void ForceZero(const void* mem, word32 length)
+{
+    volatile byte* z = (volatile byte*)mem;
+
+    while (length--) *z++ = 0;
+}
+
+
+/* check all length bytes for equality, return 0 on success */
+STATIC INLINE int ConstantCompare(const byte* a, const byte* b,
+                                  word32 length)
+{
+    word32 i;
+    word32 compareSum = 0;
+
+    for (i = 0; i < length; i++) {
+        compareSum |= a[i] ^ b[i];
+    }
+
+    return compareSum;
+}
+
+
+#undef STATIC
+
+
+#endif /* !WOLFSSL_MISC_INCLUDED && !NO_INLINE */
+
+
+#endif /* WOLFSSH_MISC_C */