From d95736bc9d30176044e8a19968b60abd8cfa0433 Mon Sep 17 00:00:00 2001
From: Nguyen Anh Quynh <aquynh@gmail.com>
Date: Sat, 13 Apr 2019 11:11:58 +0800
Subject: [PATCH] fuzz: add fuzz_decode_platform.c

---
 .gitignore                        |  1 +
 suite/fuzz/Makefile               | 14 ++++++++++++--
 suite/fuzz/fuzz_decode_platform.c | 32 +++++++++++++++++++++++++++++++
 3 files changed, 45 insertions(+), 2 deletions(-)
 create mode 100644 suite/fuzz/fuzz_decode_platform.c

diff --git a/.gitignore b/.gitignore
index c6c40729..1d328b09 100644
--- a/.gitignore
+++ b/.gitignore
@@ -117,6 +117,7 @@ fuzz_harness
 test_iter_benchmark
 fuzz_bindisasm
 fuzz_disasm
+fuzz_decode_platform
 capstone_get_setup
 
 
diff --git a/suite/fuzz/Makefile b/suite/fuzz/Makefile
index 3370df37..25d42db0 100644
--- a/suite/fuzz/Makefile
+++ b/suite/fuzz/Makefile
@@ -42,11 +42,12 @@ SOURCES = fuzz_disasm.c drivermc.c fuzz_harness.c driverbin.c
 OBJS = $(addprefix $(OBJDIR)/,$(SOURCES:.c=.o))
 BINARY = $(addprefix $(TESTDIR)/,fuzz_disasm$(BIN_EXT))
 BINARYBIN = $(addprefix $(TESTDIR)/,fuzz_bindisasm$(BIN_EXT))
+PLATFORMDECODE = $(addprefix $(TESTDIR)/,fuzz_decode_platform$(BIN_EXT))
 
-all: $(BINARY) $(BINARYBIN)
+all: $(BINARY) $(BINARYBIN) $(PLATFORMDECODE)
 
 clean:
-	rm -rf fuzz_harness $(OBJS) $(BINARY) $(BINARYBIN) $(OBJDIR)/lib$(LIBNAME).* $(OBJDIR)/$(LIBNAME).*
+	rm -rf fuzz_harness $(OBJS) $(PLATFORMDECODE) $(BINARY) $(BINARYBIN) $(OBJDIR)/lib$(LIBNAME).* $(OBJDIR)/$(LIBNAME).*
 
 $(BINARY): fuzz_disasm.o drivermc.o
 	@mkdir -p $(@D)
@@ -66,6 +67,15 @@ else
 	$(link-static)
 endif
 
+$(PLATFORMDECODE): fuzz_decode_platform.o
+	@mkdir -p $(@D)
+ifeq ($(V),0)
+	$(call log,LINK,$(notdir $@))
+	@$(link-static)
+else
+	$(link-static)
+endif
+
 $(OBJDIR)/%.o: %.c
 	@mkdir -p $(@D)
 ifeq ($(V),0)
diff --git a/suite/fuzz/fuzz_decode_platform.c b/suite/fuzz/fuzz_decode_platform.c
new file mode 100644
index 00000000..675673bc
--- /dev/null
+++ b/suite/fuzz/fuzz_decode_platform.c
@@ -0,0 +1,32 @@
+// this tool decodes first input byte feed to OSS fuzz, that encodes arch+mode
+// by Nguyen Anh Quynh, 2019
+
+#include <stdio.h>
+#include <inttypes.h>
+
+#include <capstone/capstone.h>
+
+#include "platform.h"
+
+static struct platform platforms[] = {
+#include "platforms.inc"
+};
+
+int main(int argc, char **argv)
+{
+    unsigned int platforms_len = sizeof(platforms)/sizeof(platforms[0]), data, i;
+
+	if (argc != 2) {
+		printf("Decoding OSS fuzz platform\n", argv[0]);
+		printf("Syntax: %s <hex-byte>\n", argv[0]);
+		return -1;
+	}
+
+	data = (unsigned int)strtol(argv[1], NULL, 16);
+	i = (unsigned int)data % platforms_len;
+
+	printf("cstool arch+mode = %s\n", platforms[i].cstoolname);
+
+	return 0;
+}
+