From 0af74215dbc7b21711c8be8fd0c55b3e8bc174d1 Mon Sep 17 00:00:00 2001
From: yellows8 <yellows8@users.noreply.github.com>
Date: Fri, 5 Jun 2015 21:33:26 -0400
Subject: [PATCH] Implemented --stride.

---
 ropgadget_patternfinder.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/ropgadget_patternfinder.c b/ropgadget_patternfinder.c
index 9a10682..0dd6706 100644
--- a/ropgadget_patternfinder.c
+++ b/ropgadget_patternfinder.c
@@ -106,6 +106,7 @@ int main(int argc, char **argv)
 	unsigned char *inhashptr;
 	size_t filebufsz=0, pos, hashblocksize=0;
 	unsigned int tmpsize=0;
+	unsigned int stride = 4;
 	struct stat filestat;
 	FILE *fbin;
 
@@ -119,6 +120,7 @@ int main(int argc, char **argv)
 		printf("Options:\n");
 		printf("--patternsha256=<bindata> Hash every --patternsha256size bytes in the binary, for locating the target pattern. The input bindata(sha256 hash) size must be 0x20-bytes.\n");
 		printf("--patternsha256size=0x<hexval> See --patternsha256.\n");
+		printf("--stride=0x<hexval> In the search loop, this is the value that the pos is increased by at the end of each interation. By default this is 0x4.\n");
 
 		return 0;
 	}
@@ -149,6 +151,11 @@ int main(int argc, char **argv)
 			hashblocksize = tmpsize;
 		}
 
+		if(strncmp(argv[argi], "--stride=", 9)==0)
+		{
+			sscanf(&argv[argi][9], "0x%x", &stride);
+		}
+
 		if(ret!=0)break;
 	}
 
@@ -201,7 +208,7 @@ int main(int argc, char **argv)
 	found = 0;
 	ret = 0;
 
-	for(pos=0; pos<filebufsz; pos+=4)
+	for(pos=0; pos<filebufsz; pos+=stride)
 	{
 		if(filebufsz - pos < hashblocksize)break;