Add a simple base64 encoder for use in tests

Originally committed as revision 24526 to svn://svn.ffmpeg.org/ffmpeg/trunk

Makefile

@@ -15,7 +15,7 @@ OBJS        = $(addsuffix .o,          $(PROGS-yes)) cmdutils.o
 MANPAGES    = $(addprefix doc/, $(addsuffix .1, $(PROGS-yes)))
 HTMLPAGES   = $(addprefix doc/, $(addsuffix -doc.html, $(PROGS-yes)))
 TOOLS       = $(addprefix tools/, $(addsuffix $(EXESUF), cws2fws pktdumper probetest qt-faststart trasher))
-HOSTPROGS   = $(addprefix tests/, audiogen videogen rotozoom tiny_psnr)
+HOSTPROGS   = $(addprefix tests/, audiogen videogen rotozoom tiny_psnr base64)
 
 BASENAMES   = ffmpeg ffplay ffprobe ffserver
 ALLPROGS    = $(addsuffix   $(EXESUF), $(BASENAMES))
@@ -159,7 +159,7 @@ testclean:
 	$(RM) -r tests/vsynth1 tests/vsynth2 tests/data
 	$(RM) $(addprefix tests/,$(CLEANSUFFIXES))
 	$(RM) tests/seek_test$(EXESUF) tests/seek_test.o
-	$(RM) $(addprefix tests/,$(addsuffix $(HOSTEXESUF),audiogen videogen rotozoom tiny_psnr))
+	$(RM) $(addprefix tests/,$(addsuffix $(HOSTEXESUF),audiogen videogen rotozoom tiny_psnr base64))
 
 clean:: testclean
 	$(RM) $(ALLPROGS) $(ALLPROGS_G)

tests/base64.c

@@ -0,0 +1,53 @@
+/*
+ * 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
+ */
+
+/*
+ * Based on libavutil/base64.c
+ */
+
+#include <stdio.h>
+
+int main(void)
+{
+    static const char b64[] =
+        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+    unsigned i_bits = 0;
+    int i_shift = 0;
+    int out_len = 0;
+    int in;
+
+#define putb64() do {                                   \
+        putchar(b64[(i_bits << 6 >> i_shift) & 0x3f]);  \
+        out_len++;                                      \
+        i_shift -= 6;                                   \
+    } while (0)
+
+    while ((in = getchar()) != EOF) {
+        i_bits = (i_bits << 8) + in;
+        i_shift += 8;
+        while (i_shift > 6)
+            putb64();
+    }
+    while (i_shift > 0)
+        putb64();
+    while (out_len++ & 3)
+        putchar('=');
+    putchar('\n');
+
+    return 0;
+}