Create macros to make GCC's aligned instructions cross-platform compatible. Fixes "error C2146: syntax error: missing ';' before identifier '__attribute__'"

Author: codebling

sha1.c

@@ -3,6 +3,12 @@
 #include <string.h>
 #include <openssl/sha.h>
 
+#if defined(_MSC_VER)
+#define __align(boundary, type) __declspec(align(boundary)) type
+#else
+#define __align(boundary, type) type __attribute__((aligned(boundary)))
+#endif
+
 inline void encodeb64(const unsigned char* pch, char* buff)
 {
   const char *pbase64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
@@ -33,9 +39,9 @@ inline void encodeb64(const unsigned char* pch, char* buff)
 
 void sha1_hash(const char* input, char* output, uint32_t len)
 {
-  char str[38] __attribute__((aligned(32))); // 26 + 11 + 1
-  uint32_t prehash[5] __attribute__((aligned(32)));
-  uint32_t hash[5] __attribute__((aligned(32))) = { 0 };
+  __align(32, char str[38]); // 26 + 11 + 1
+  __align(32, uint32_t prehash[5]);
+  __align(32, uint32_t hash[5]) = { 0 };
   int i = 0;
   SHA_CTX ctx;
   SHA1_Init(&ctx);