From 435e8626d736559ad1f96176802ef705c969b37f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niels=20M=C3=B6ller?= <nisse@lysator.liu.se>
Date: Sat, 14 Apr 2012 14:40:49 +0200
Subject: [PATCH] New base64dec example program, based on code contributed by
Jeronimo Pellegrini.
---
examples/Makefile.in | 8 +++-
examples/base64dec.c | 112 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 118 insertions(+), 2 deletions(-)
create mode 100644 examples/base64dec.c
diff --git a/examples/Makefile.in b/examples/Makefile.in
index 1b6abfe1..b7b1a9ff 100644
--- a/examples/Makefile.in
+++ b/examples/Makefile.in
@@ -17,12 +17,12 @@ RSA_TARGETS = rsa-keygen$(EXEEXT) rsa-sign$(EXEEXT) \
rsa-verify$(EXEEXT) rsa-encrypt$(EXEEXT) rsa-decrypt$(EXEEXT)
TARGETS = nettle-benchmark$(EXEEXT) eratosthenes$(EXEEXT) \
- base64enc$(EXEEXT) @IF_HOGWEED@ $(RSA_TARGETS) next-prime$(EXEEXT) random-prime$(EXEEXT)
+ base64enc$(EXEEXT) base64dec$(EXEEXT) @IF_HOGWEED@ $(RSA_TARGETS) next-prime$(EXEEXT) random-prime$(EXEEXT)
SOURCES = nettle-benchmark.c eratosthenes.c next-prime.c random-prime.c \
nettle-openssl.c \
io.c read_rsa_key.c \
rsa-encrypt.c rsa-decrypt.c rsa-keygen.c rsa-sign.c rsa-verify.c \
- base64enc.c
+ base64enc.c base64dec.c
GETOPT_OBJS = ../getopt.$(OBJEXT) ../getopt1.$(OBJEXT)
@@ -74,6 +74,10 @@ base64enc$(EXEEXT): base64enc.$(OBJEXT) io.$(OBJEXT)
$(LINK) base64enc.$(OBJEXT) io.$(OBJEXT) \
-lnettle $(LIBS) -o base64enc$(EXEEXT)
+base64dec$(EXEEXT): base64dec.$(OBJEXT) io.$(OBJEXT)
+ $(LINK) base64dec.$(OBJEXT) io.$(OBJEXT) \
+ -lnettle $(LIBS) -o base64dec$(EXEEXT)
+
eratosthenes$(EXEEXT): eratosthenes.$(OBJEXT) $(GETOPT_OBJS)
$(LINK) eratosthenes.$(OBJEXT) $(GETOPT_OBJS) -o eratosthenes$(EXEEXT)
diff --git a/examples/base64dec.c b/examples/base64dec.c
new file mode 100644
index 00000000..6125dfa7
--- /dev/null
+++ b/examples/base64dec.c
@@ -0,0 +1,112 @@
+/* base64dec -- an decoder for base64
+ *
+ * Copyright (C) 2006, 2012 Jeronimo Pellegrini, Niels Möller
+ *
+ * This program 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.
+ *
+ * This program 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 the nettle library; see the file COPYING.LIB. If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <nettle/base64.h>
+
+#include "io.h"
+
+#define CHUNK_SIZE 16392
+
+/* The maximum number of bytes generated for each chunk: */
+#define DECODED_SIZE BASE64_DECODE_LENGTH(CHUNK_SIZE)
+
+
+/*
+ * Reads base-64 encoded from stdin, writes decoded to stdout.
+ */
+int
+main(int argc UNUSED, char **argv UNUSED)
+{
+ /* "buffer" will hold the bytes from disk: */
+ uint8_t * buffer = xalloc (CHUNK_SIZE);
+
+ /* "result" will hold bytes before output: */
+ uint8_t * result = xalloc (DECODED_SIZE);
+
+ /* We need a Base64 context for decoding: */
+ struct base64_decode_ctx b64_ctx;
+
+ /* Init the context: */
+ base64_decode_init(&b64_ctx);
+
+#ifdef WIN32
+ _setmode(1, O_BINARY);
+#endif
+
+ for (;;)
+ {
+ int nbytes; /* Number of bytes read frmo disk at each iteration */
+ unsigned decoded_bytes; /* Bytes actually generated at each iteration */
+
+ nbytes = fread(buffer, 1, CHUNK_SIZE, stdin);
+
+ if (nbytes < CHUNK_SIZE && ferror(stdin))
+ {
+ werror ("Error reading file: %s\n", strerror(errno));
+ return EXIT_FAILURE;
+ }
+
+ decoded_bytes = BASE64_DECODE_LENGTH(nbytes);
+
+ /* Decodes one chunk: */
+ if (!base64_decode_update(&b64_ctx, &decoded_bytes, result, nbytes, buffer))
+ {
+ werror ("Error decoding input (not base64?)\n");
+ return EXIT_FAILURE;
+ }
+
+ if (!write_string (stdout, decoded_bytes, result))
+ {
+ werror ("Error writing file: %s\n", strerror(errno));
+ return EXIT_FAILURE;
+ }
+
+ if (nbytes < CHUNK_SIZE)
+ {
+ /* Check if decoding finalized OK: */
+ if (!base64_decode_final(&b64_ctx))
+ {
+ werror ("Decoding did not finish properly.\n");
+ return EXIT_FAILURE;
+ }
+ break;
+ }
+ }
+
+ if (fflush (stdout) != 0)
+ {
+ werror ("Error writing file: %s\n", strerror(errno));
+ return EXIT_FAILURE;
+ }
+
+ free (buffer);
+ free (result);
+
+ return EXIT_SUCCESS;
+}
--
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