Add 'neozip/' from commit 'c2712b8a345191f6ed79558c089777df94590087'

git-subtree-dir: neozip
git-subtree-mainline: b1e34e861b5d732afe828d58aad2c638135061fd
git-subtree-split: c2712b8a345191f6ed79558c089777df94590087

1 files changed, 119 insertions, 0 deletions

diff --git a/neozip/test/fuzz/fuzzer_example_flush.c b/neozip/test/fuzz/fuzzer_example_flush.c
new file mode 100644
index 0000000000..baa6988e36
--- /dev/null
+++ b/neozip/test/fuzz/fuzzer_example_flush.c
@@ -0,0 +1,119 @@
+#include <stdio.h>
+#include <assert.h>
+
+#include "zbuild.h"
+#ifdef ZLIB_COMPAT
+#  include "zlib.h"
+#else
+#  include "zlib-ng.h"
+#endif
+
+#define CHECK_ERR(err, msg) { \
+    if (err != Z_OK) { \
+        fprintf(stderr, "%s error: %d\n", msg, err); \
+        exit(1); \
+    } \
+}
+
+static const uint8_t *data;
+static size_t dataLen;
+static alloc_func zalloc = NULL;
+static free_func zfree = NULL;
+
+/* ===========================================================================
+ * Test deflate() with full flush
+ */
+void test_flush(unsigned char *compr, z_size_t *comprLen) {
+    PREFIX3(stream) c_stream; /* compression stream */
+    int err;
+    unsigned int len = (unsigned int)dataLen;
+
+    c_stream.zalloc = zalloc;
+    c_stream.zfree = zfree;
+    c_stream.opaque = (void *)0;
+
+    err = PREFIX(deflateInit)(&c_stream, Z_DEFAULT_COMPRESSION);
+    CHECK_ERR(err, "deflateInit");
+
+    c_stream.next_in = (z_const unsigned char *)data;
+    c_stream.next_out = compr;
+    c_stream.avail_in = 3;
+    c_stream.avail_out = (unsigned int)*comprLen;
+    err = PREFIX(deflate)(&c_stream, Z_FULL_FLUSH);
+    CHECK_ERR(err, "deflate flush 1");
+
+    compr[3]++; /* force an error in first compressed block */
+    c_stream.avail_in = len - 3;
+
+    err = PREFIX(deflate)(&c_stream, Z_FINISH);
+    if (err != Z_STREAM_END) {
+        CHECK_ERR(err, "deflate flush 2");
+    }
+    err = PREFIX(deflateEnd)(&c_stream);
+    CHECK_ERR(err, "deflateEnd");
+
+    *comprLen = (z_size_t)c_stream.total_out;
+}
+
+/* ===========================================================================
+ * Test inflateSync()
+ */
+void test_sync(unsigned char *compr, size_t comprLen, unsigned char *uncompr, size_t uncomprLen) {
+    int err;
+    PREFIX3(stream) d_stream; /* decompression stream */
+
+    d_stream.zalloc = zalloc;
+    d_stream.zfree = zfree;
+    d_stream.opaque = (void *)0;
+
+    d_stream.next_in = compr;
+    d_stream.avail_in = 2; /* just read the zlib header */
+
+    err = PREFIX(inflateInit)(&d_stream);
+    CHECK_ERR(err, "inflateInit");
+
+    d_stream.next_out = uncompr;
+    d_stream.avail_out = (unsigned int)uncomprLen;
+
+    err = PREFIX(inflate)(&d_stream, Z_NO_FLUSH);
+    CHECK_ERR(err, "inflate");
+
+    d_stream.avail_in = (unsigned int)comprLen - 2; /* read all compressed data */
+    err = PREFIX(inflateSync)(&d_stream); /* but skip the damaged part */
+    CHECK_ERR(err, "inflateSync");
+
+    err = PREFIX(inflate)(&d_stream, Z_FINISH);
+    if (err != Z_STREAM_END) {
+        fprintf(stderr, "inflate should report Z_STREAM_END\n");
+        exit(1);
+    }
+    err = PREFIX(inflateEnd)(&d_stream);
+    CHECK_ERR(err, "inflateEnd");
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *d, size_t size) {
+    z_size_t comprLen = 100 + 2 * PREFIX(compressBound)(size);
+    z_size_t uncomprLen = (z_size_t)size;
+    uint8_t *compr, *uncompr;
+
+    /* Discard inputs larger than 1Mb. */
+    static size_t kMaxSize = 1024 * 1024;
+
+    // This test requires at least 3 bytes of input data.
+    if (size <= 3 || size > kMaxSize)
+        return 0;
+
+    data = d;
+    dataLen = size;
+    compr = (uint8_t *)calloc(1, comprLen);
+    uncompr = (uint8_t *)calloc(1, uncomprLen);
+
+    test_flush(compr, &comprLen);
+    test_sync(compr, comprLen, uncompr, uncomprLen);
+
+    free(compr);
+    free(uncompr);
+
+    /* This function must return 0. */
+    return 0;
+}