updates to OSS-Fuzz integration

adapt more fuzz targets from zlib,
add zip fuzzer, zip dictionary.
update uncompress_fuzzer to seed the buffer length separately.

tests/large_fuzzer.c

@@ -0,0 +1,130 @@
+/* Derived from zlib fuzzers at http://github.com/google/oss-fuzz/tree/master/projects/zlib,
+ * see ossfuzz.sh for full license text.
+*/
+
+#include <stdio.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include <inttypes.h>
+
+#include "miniz.h"
+
+#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;
+static unsigned int diff;
+
+/* Test deflate() with large buffers and dynamic change of compression level */
+void test_large_deflate(unsigned char *compr, size_t comprLen,
+                        unsigned char *uncompr, size_t uncomprLen)
+{
+    z_stream c_stream; /* compression stream */
+    int err;
+
+    c_stream.zalloc = zalloc;
+    c_stream.zfree = zfree;
+    c_stream.opaque = NULL;
+
+    err = deflateInit(&c_stream, Z_BEST_COMPRESSION);
+    CHECK_ERR(err, "deflateInit");
+
+    c_stream.next_out = compr;
+    c_stream.avail_out = (unsigned int)comprLen;
+
+    /* At this point, uncompr is still mostly zeroes, so it should compress
+    * very well:
+    */
+    c_stream.next_in = uncompr;
+    c_stream.avail_in = (unsigned int)uncomprLen;
+    err = deflate(&c_stream, Z_NO_FLUSH);
+    CHECK_ERR(err, "deflate large 1");
+
+    if (c_stream.avail_in != 0)
+    {
+        fprintf(stderr, "deflate not greedy\n");
+        exit(1);
+    }
+
+    /* Feed in already compressed data: */
+    c_stream.next_in = compr;
+    diff = (unsigned int)(c_stream.next_out - compr);
+    c_stream.avail_in = diff;
+
+    deflate(&c_stream, Z_NO_FLUSH);
+    err = deflate(&c_stream, Z_FINISH);
+
+    if (err != Z_STREAM_END)
+    {
+        fprintf(stderr, "deflate large should report Z_STREAM_END\n");
+        exit(1);
+    }
+    err = deflateEnd(&c_stream);
+    CHECK_ERR(err, "deflateEnd");
+}
+
+/* Test inflate() with large buffers */
+void test_large_inflate(unsigned char *compr, size_t comprLen,
+                        unsigned char *uncompr, size_t uncomprLen)
+{
+    int err;
+    z_stream d_stream; /* decompression stream */
+
+    d_stream.zalloc = zalloc;
+    d_stream.zfree = zfree;
+    d_stream.opaque = NULL;
+
+    d_stream.next_in = compr;
+    d_stream.avail_in = (unsigned int)comprLen;
+
+    err = inflateInit(&d_stream);
+    CHECK_ERR(err, "inflateInit");
+
+    for (;;)
+    {
+        d_stream.next_out = uncompr; /* discard the output */
+        d_stream.avail_out = (unsigned int)uncomprLen;
+        err = inflate(&d_stream, Z_NO_FLUSH);
+        if (err == Z_STREAM_END) break;
+
+        CHECK_ERR(err, "large inflate");
+    }
+
+    err = inflateEnd(&d_stream);
+    CHECK_ERR(err, "inflateEnd");
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *d, size_t size)
+{
+    size_t comprLen = 100 + 3 * size;
+    size_t uncomprLen = comprLen;
+    uint8_t *compr, *uncompr;
+
+    /* Discard inputs larger than 512Kb. */
+    static size_t kMaxSize = 512 * 1024;
+
+    if (size < 1 || size > kMaxSize)
+    return 0;
+
+    data = d;
+    dataLen = size;
+    compr = calloc(1, comprLen);
+    uncompr = calloc(1, uncomprLen);
+
+    test_large_deflate(compr, comprLen, uncompr, uncomprLen);
+    test_large_inflate(compr, comprLen, uncompr, uncomprLen);
+
+    free(compr);
+    free(uncompr);
+
+    return 0;
+}