fix: breakpad use miniz

third_party/zlib-ng/test/fuzz/fuzzer_minigzip.c

@@ -0,0 +1,316 @@
+/* minigzip.c -- simulate gzip using the zlib compression library
+ * Copyright (C) 1995-2006, 2010, 2011, 2016 Jean-loup Gailly
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/*
+ * minigzip is a minimal implementation of the gzip utility. This is
+ * only an example of using zlib and isn't meant to replace the
+ * full-featured gzip. No attempt is made to deal with file systems
+ * limiting names to 14 or 8+3 characters, etc... Error checking is
+ * very limited. So use minigzip only for testing; use gzip for the
+ * real thing.
+ */
+
+#include "zbuild.h"
+#ifdef ZLIB_COMPAT
+#  include "zlib.h"
+#else
+#  include "zlib-ng.h"
+#endif
+#include <stdio.h>
+#include <assert.h>
+
+#ifdef USE_MMAP
+#  include <sys/types.h>
+#  include <sys/mman.h>
+#  include <sys/stat.h>
+#endif
+
+#if defined(_WIN32) || defined(__CYGWIN__)
+#  include <fcntl.h>
+#  include <io.h>
+#  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
+#else
+#  define SET_BINARY_MODE(file)
+#endif
+
+#if defined(_MSC_VER) && _MSC_VER < 1900
+#  define snprintf _snprintf
+#endif
+
+#if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE)
+#ifndef _WIN32 /* unlink already in stdio.h for Win32 */
+extern int unlink (const char *);
+#endif
+#endif
+
+#ifndef GZ_SUFFIX
+#  define GZ_SUFFIX ".gz"
+#endif
+#define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1)
+
+#define BUFLEN      16384        /* read buffer size */
+#define BUFLENW     (BUFLEN * 3) /* write buffer size */
+#define MAX_NAME_LEN 1024
+
+static const char *prog = "minigzip_fuzzer";
+
+/* ===========================================================================
+ * Display error message and exit
+ */
+static void error(const char *msg) {
+    fprintf(stderr, "%s: %s\n", prog, msg);
+    exit(1);
+}
+
+#ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */
+/* ===========================================================================
+ * Try compressing the input file at once using mmap. Return Z_OK if
+ * success, Z_ERRNO otherwise.
+ */
+static int gz_compress_mmap(FILE *in, gzFile out) {
+    int len;
+    int err;
+    int ifd = fileno(in);
+    char *buf;      /* mmap'ed buffer for the entire input file */
+    off_t buf_len;  /* length of the input file */
+    struct stat sb;
+
+    /* Determine the size of the file, needed for mmap: */
+    if (fstat(ifd, &sb) < 0) return Z_ERRNO;
+    buf_len = sb.st_size;
+    if (buf_len <= 0) return Z_ERRNO;
+
+    /* Now do the actual mmap: */
+    buf = mmap((void *)0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0);
+    if (buf == (char *)(-1)) return Z_ERRNO;
+
+    /* Compress the whole file at once: */
+    len = PREFIX(gzwrite)(out, (char *)buf, (unsigned)buf_len);
+
+    if (len != (int)buf_len) error(PREFIX(gzerror)(out, &err));
+
+    munmap(buf, buf_len);
+    fclose(in);
+    if (PREFIX(gzclose)(out) != Z_OK) error("failed gzclose");
+    return Z_OK;
+}
+#endif /* USE_MMAP */
+
+/* ===========================================================================
+ * Compress input to output then close both files.
+ */
+
+static void gz_compress(FILE *in, gzFile out) {
+    char buf[BUFLEN];
+    int len;
+    int err;
+
+#ifdef USE_MMAP
+    /* Try first compressing with mmap. If mmap fails (minigzip used in a
+     * pipe), use the normal fread loop.
+     */
+    if (gz_compress_mmap(in, out) == Z_OK) return;
+#endif
+    /* Clear out the contents of buf before reading from the file to avoid
+       MemorySanitizer: use-of-uninitialized-value warnings. */
+    memset(buf, 0, sizeof(buf));
+    for (;;) {
+        len = (int)fread(buf, 1, sizeof(buf), in);
+        if (ferror(in)) {
+            perror("fread");
+            exit(1);
+        }
+        if (len == 0) break;
+
+        if (PREFIX(gzwrite)(out, buf, (unsigned)len) != len) error(PREFIX(gzerror)(out, &err));
+    }
+    fclose(in);
+    if (PREFIX(gzclose)(out) != Z_OK) error("failed gzclose");
+}
+
+/* ===========================================================================
+ * Uncompress input to output then close both files.
+ */
+static void gz_uncompress(gzFile in, FILE *out) {
+    char buf[BUFLENW];
+    int len;
+    int err;
+
+    for (;;) {
+        len = PREFIX(gzread)(in, buf, sizeof(buf));
+        if (len < 0) error (PREFIX(gzerror)(in, &err));
+        if (len == 0) break;
+
+        if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {
+            error("failed fwrite");
+        }
+    }
+    if (fclose(out)) error("failed fclose");
+
+    if (PREFIX(gzclose)(in) != Z_OK) error("failed gzclose");
+}
+
+
+/* ===========================================================================
+ * Compress the given file: create a corresponding .gz file and remove the
+ * original.
+ */
+static void file_compress(char *file, char *mode) {
+    char outfile[MAX_NAME_LEN];
+    FILE *in;
+    gzFile out;
+
+    if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) {
+        fprintf(stderr, "%s: filename too long\n", prog);
+        exit(1);
+    }
+
+    snprintf(outfile, sizeof(outfile), "%s%s", file, GZ_SUFFIX);
+
+    in = fopen(file, "rb");
+    if (in == NULL) {
+        perror(file);
+        exit(1);
+    }
+    out = PREFIX(gzopen)(outfile, mode);
+    if (out == NULL) {
+        fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile);
+        exit(1);
+    }
+    gz_compress(in, out);
+
+    unlink(file);
+}
+
+/* ===========================================================================
+ * Uncompress the given file and remove the original.
+ */
+static void file_uncompress(char *file) {
+    char buf[MAX_NAME_LEN];
+    char *infile, *outfile;
+    FILE *out;
+    gzFile in;
+    size_t len = strlen(file);
+
+    if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) {
+        fprintf(stderr, "%s: filename too long\n", prog);
+        exit(1);
+    }
+
+    snprintf(buf, sizeof(buf), "%s", file);
+
+    if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) {
+        infile = file;
+        outfile = buf;
+        outfile[len-3] = '\0';
+    } else {
+        outfile = file;
+        infile = buf;
+        snprintf(buf + len, sizeof(buf) - len, "%s", GZ_SUFFIX);
+    }
+    in = PREFIX(gzopen)(infile, "rb");
+    if (in == NULL) {
+        fprintf(stderr, "%s: can't gzopen %s\n", prog, infile);
+        exit(1);
+    }
+    out = fopen(outfile, "wb");
+    if (out == NULL) {
+        perror(file);
+        exit(1);
+    }
+
+    gz_uncompress(in, out);
+
+    unlink(infile);
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t dataLen) {
+    char *inFileName = "minigzip_fuzzer.out";
+    char *outFileName = "minigzip_fuzzer.out.gz";
+    char outmode[20];
+    FILE *in;
+    char buf[BUFLEN];
+    uint32_t offset = 0;
+
+    /* Discard inputs larger than 1Mb. */
+    static size_t kMaxSize = 1024 * 1024;
+    if (dataLen < 1 || dataLen > kMaxSize)
+        return 0;
+
+    in = fopen(inFileName, "wb");
+    if (fwrite(data, 1, (unsigned)dataLen, in) != dataLen)
+        error("failed fwrite");
+    if (fclose(in))
+        error("failed fclose");
+
+    memset(outmode, 0, sizeof(outmode));
+    snprintf(outmode, sizeof(outmode), "%s", "wb");
+
+    /* Compression level: [0..9]. */
+    outmode[2] = '0' + (data[0] % 10);
+
+    switch (data[dataLen-1] % 6) {
+    default:
+    case 0:
+        outmode[3] = 0;
+        break;
+    case 1:
+        /* compress with Z_FILTERED */
+        outmode[3] = 'f';
+        break;
+    case 2:
+        /* compress with Z_HUFFMAN_ONLY */
+        outmode[3] = 'h';
+        break;
+    case 3:
+        /* compress with Z_RLE */
+        outmode[3] = 'R';
+        break;
+    case 4:
+        /* compress with Z_FIXED */
+        outmode[3] = 'F';
+        break;
+    case 5:
+        /* direct */
+        outmode[3] = 'T';
+        break;
+    }
+
+    file_compress(inFileName, outmode);
+
+    /* gzopen does not support reading in direct mode */
+    if (outmode[3] == 'T')
+        inFileName = outFileName;
+    else
+        file_uncompress(outFileName);
+
+    /* Check that the uncompressed file matches the input data. */
+    in = fopen(inFileName, "rb");
+    if (in == NULL) {
+        perror(inFileName);
+        exit(1);
+    }
+
+    memset(buf, 0, sizeof(buf));
+    for (;;) {
+        int len = (int)fread(buf, 1, sizeof(buf), in);
+        if (ferror(in)) {
+            perror("fread");
+            exit(1);
+        }
+        if (len == 0)
+            break;
+        int c = memcmp(data + offset, buf, len);
+        assert(0 == c);
+        Z_UNUSED(c); // in Release build, assert() is a no-op.
+        offset += len;
+    }
+
+    if (fclose(in))
+        error("failed fclose");
+
+    /* This function must return 0. */
+    return 0;
+}