add new tool 'stripnul' which can be used to drop leading zeros from a file which is useful to do byte-by-byte comparison of what goes in and comes out of PA

git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/glitch-free@2307 fefdeb5f-60dc-0310-8127-8f9354f1896f

src/tests/stripnul.c

@@ -0,0 +1,72 @@
+/* $Id$ */
+
+/***
+  This file is part of PulseAudio.
+
+  PulseAudio 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 of the License,
+  or (at your option) any later version.
+
+  PulseAudio 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
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+
+#include <pulse/xmalloc.h>
+#include <pulsecore/macro.h>
+
+int main(int argc, char *argv[]) {
+    FILE *i, *o;
+    size_t granularity;
+    pa_bool_t found;
+    uint8_t *zero;
+
+    pa_assert_se(argc >= 2);
+    pa_assert_se((granularity = atoi(argv[1])) >= 1);
+    pa_assert_se((i = (argc >= 3) ? fopen(argv[2], "r") : stdin));
+    pa_assert_se((o = (argc >= 4) ? fopen(argv[3], "w") : stdout));
+
+    zero = pa_xmalloc0(granularity);
+
+    for (;;) {
+        uint8_t buffer[16*1024], *p;
+        size_t k;
+
+        k = fread(buffer, granularity, sizeof(buffer)/granularity, i);
+
+        if (k <= 0)
+            break;
+
+        if (found)
+            pa_assert_se(fwrite(buffer, granularity, k, o) == k);
+        else {
+            for (p = buffer; (p-buffer)/granularity < k; p += granularity)
+                if (memcmp(p, zero, granularity)) {
+                    size_t left;
+                    found = TRUE;
+                    left = k - (p-buffer)/granularity;
+                    pa_assert_se(fwrite(p, granularity, left, o) == left);
+                    break;
+                }
+        }
+    }
+
+    fflush(o);
+
+    return 0;
+}