fuzz: add plist writer API fuzzer

1 files changed, 102 insertions, 0 deletions

diff --git a/fuzz/plist_write_fuzzer.cc b/fuzz/plist_write_fuzzer.cc
new file mode 100644
index 0000000..22ccf15
--- /dev/null
+++ b/fuzz/plist_write_fuzzer.cc
@@ -0,0 +1,102 @@
+ /*
+ * plist_write_fuzzer.cc
+ * plist writer fuzz target for libFuzzer
+ *
+ * Copyright (c) 2017 Nikias Bassen All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <plist/plist.h>
+
+#include <stddef.h>
+#include <stdint.h>
+
+static plist_format_t select_output_format(uint8_t mode)
+{
+    switch (mode % 6) {
+    case 0: return PLIST_FORMAT_XML;
+    case 1: return PLIST_FORMAT_JSON;
+    case 2: return PLIST_FORMAT_OSTEP;
+    case 3: return PLIST_FORMAT_PRINT;
+    case 4: return PLIST_FORMAT_LIMD;
+    default: return PLIST_FORMAT_PLUTIL;
+    }
+}
+
+static plist_write_options_t select_options(uint8_t opt)
+{
+    unsigned int options = PLIST_OPT_NONE;
+
+    if (opt & 0x01) {
+        options |= PLIST_OPT_COMPACT;
+    }
+    if (opt & 0x02) {
+        options |= PLIST_OPT_COERCE;
+    }
+    if (opt & 0x04) {
+        options |= PLIST_OPT_NO_NEWLINE;
+    }
+    if (opt & 0x08) {
+        options |= PLIST_OPT_PARTIAL_DATA;
+    }
+    if (opt & 0x10) {
+        options |= PLIST_OPT_INDENT;
+        options |= PLIST_OPT_INDENT_BY(1);
+    }
+
+    return static_cast<plist_write_options_t>(options);
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
+{
+    if (!data || size < 3 || size > 4096) {
+        return 0;
+    }
+
+    const uint8_t mode = data[size - 2];
+    const uint8_t opt = data[size - 1];
+
+    plist_t root = NULL;
+    plist_format_t in_format = PLIST_FORMAT_NONE;
+
+    plist_err_t err = plist_from_memory(
+        reinterpret_cast<const char*>(data),
+        static_cast<uint32_t>(size - 2),
+        &root,
+        &in_format
+    );
+
+    if (err != PLIST_ERR_SUCCESS || !root) {
+        plist_free(root);
+        return 0;
+    }
+
+    char* output = NULL;
+    uint32_t output_len = 0;
+
+    (void)plist_write_to_string(
+        root,
+        &output,
+        &output_len,
+        select_output_format(mode),
+        select_options(opt)
+    );
+
+    plist_mem_free(output);
+    plist_free(root);
+
+    return 0;
+}