added compression (ZLIB)gnutls0-0-5

1 files changed, 89 insertions, 0 deletions

diff --git a/lib/gnutls_compress_int.c b/lib/gnutls_compress_int.c
new file mode 100644
index 0000000000..a78f4d951f
--- /dev/null
+++ b/lib/gnutls_compress_int.c
@@ -0,0 +1,89 @@
+/*
+ *      Copyright (C) 2000 Nikos Mavroyanopoulos
+ *
+ * This file is part of GNUTLS.
+ *
+ * GNUTLS is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GNUTLS 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 General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include <defines.h>
+#include "gnutls_int.h"
+#include "gnutls_compress.h"
+#include "gnutls_errors.h"
+#include "gnutls_compress_int.h"
+#include <zlib.h>
+
+int gnutls_compress( CompressionMethod algorithm, char* plain, int plain_size, char** compressed) {
+int compressed_size;
+uLongf size;
+int err;
+
+	switch (algorithm) {
+	case GNUTLS_COMPRESSION_NULL:
+		*compressed = gnutls_malloc(plain_size);
+		memmove(*compressed, plain, plain_size);
+		compressed_size = plain_size;
+		break;
+#ifdef HAVE_LIBZ
+	case GNUTLS_ZLIB:
+		size = (plain_size*1.2)+12;
+		*compressed = gnutls_malloc(size);
+		err = compress( *compressed, &size, plain, plain_size);
+		if (err!=Z_OK) {
+			gnutls_free(*compressed);
+			return GNUTLS_E_COMPRESSION_FAILED;
+		}
+		compressed_size = size;
+		break;
+#endif
+	default:
+		*compressed=NULL;
+		return GNUTLS_E_UNKNOWN_COMPRESSION_ALGORITHM;
+	}
+	return compressed_size;
+}
+
+int gnutls_decompress( CompressionMethod algorithm, char* compressed, int compressed_size, char** plain) {
+int plain_size, err;
+uLongf size;
+
+	switch (algorithm) {
+	case GNUTLS_COMPRESSION_NULL:
+		*plain = gnutls_malloc(compressed_size);
+		memmove(*plain, compressed, compressed_size);
+		plain_size = compressed_size;
+		break;
+#ifdef HAVE_LIBZ
+	case GNUTLS_ZLIB:
+		*plain = NULL;
+		size = compressed_size;
+		do {
+			size += compressed_size;
+			*plain = gnutls_realloc(*plain, size);
+			err = uncompress( *plain, &size, compressed, compressed_size);
+		} while( err==Z_BUF_ERROR && size < 50000); /* quite strange limit */
+		if (err!=Z_OK) {
+			gnutls_free(*plain);
+			return GNUTLS_E_DECOMPRESSION_FAILED;
+		}
+		plain_size = size;
+		break;
+#endif
+	default:
+		*plain=NULL;
+		return GNUTLS_E_UNKNOWN_COMPRESSION_ALGORITHM;
+	}
+	return plain_size;
+}