Added fuzzy testing (#26)

* added fuzzy testing

* revert formatting change

* removed artifact test

* revert metadata changes

* added fuzz limits

fuzz/.gitignore

@@ -0,0 +1,4 @@
+
+target
+corpus
+artifacts

fuzz/Cargo.toml

@@ -0,0 +1,22 @@
+
+[package]
+name = "flif-fuzz"
+version = "0.0.1"
+authors = ["Automatically generated"]
+publish = false
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies.flif]
+path = "../flif/"
+[dependencies.libfuzzer-sys]
+git = "https://github.com/rust-fuzz/libfuzzer-sys.git"
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "fuzz_flif"
+path = "fuzz_targets/fuzz_flif.rs"

fuzz/fuzz_targets/fuzz_flif.rs

@@ -0,0 +1,16 @@
+#![no_main]
+#[macro_use] extern crate libfuzzer_sys;
+extern crate flif;
+
+use std::io::Cursor;
+
+fuzz_target!(|data: &[u8]| {
+    let limits = flif::Limits {
+        metadata_chunk: 32,
+        metadata_count: 8,
+        pixels: 1<<16,
+        maniac_nodes: 512,
+    };
+    let _ = flif::Flif::decode_with_limits(Cursor::new(data), limits)
+        .map(|img| img.get_raw_pixels());
+});