tools: Add adler32 checksum tool

This is about 6 times faster than md5sum on linux
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavutil/Makefile

@@ -148,6 +148,6 @@ TESTPROGS = adler32                                                     \
 
 TESTPROGS-$(HAVE_LZO1X_999_COMPRESS) += lzo
 
-TOOLS = ffeval ffescape
+TOOLS = ffadler ffeval ffescape
 
 $(SUBDIR)lzo-test$(EXESUF): ELIBS = -llzo2

tools/ffadler.c

+/*
+* Copyright (c) 2002 Fabrice Bellard
+* Copyright (c) 2013 Michael Niedermayer
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+#include "libavutil/adler32.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/stat.h>
+
+#if HAVE_IO_H
+#include <io.h>
+#endif
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#define SIZE 65536
+
+int main(int argc, char **argv)
+{
+    uint8_t buffer[SIZE];
+    uint32_t checksum = 1;
+    int fd;
+    int ret = 0;
+
+    if (argc > 1) fd = open(argv[1], O_RDONLY);
+    else          fd = 0;
+    if (fd == -1) {
+        printf("A32=OPEN-FAILED-%d\n", errno);
+        ret = 1;
+        goto end;
+    }
+
+    for (;;) {
+        ssize_t size = read(fd, buffer, SIZE);
+        if (size < 0) {
+            printf("A32=0x%08x+READ-FAILED-%d\n", checksum, errno);
+            ret = 2;
+            goto end;
+        } else if(!size)
+            break;
+        checksum = av_adler32_update(checksum, buffer, size);
+    }
+    close(fd);
+
+    printf("A32=0x%08x", checksum);
+end:
+    if (argc > 1)
+        printf(" *%s", argv[1]);
+    printf("\n");
+
+    return ret;
+}