initial revision

1 files changed, 115 insertions, 0 deletions

diff --git a/pwmanager/pwmanager/compressgzip.cpp b/pwmanager/pwmanager/compressgzip.cpp
new file mode 100644
index 0000000..0a325c6
--- a/dev/null
+++ b/pwmanager/pwmanager/compressgzip.cpp
@@ -0,0 +1,115 @@
+/***************************************************************************
+ *                                                                         *
+ *   copyright (C) 2003, 2004 by Michael Buesch                            *
+ *   email: mbuesch@freenet.de                                             *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License version 2        *
+ *   as published by the Free Software Foundation.                         *
+ *                                                                         *
+ ***************************************************************************/
+
+/***************************************************************************
+ * copyright (C) 2004 by Ulf Schenk
+ * This file is originaly based on version 1.0.1 of pwmanager
+ * and was modified to run on embedded devices that run microkde
+ *
+ * $Id$
+ **************************************************************************/  
+
+#include "compressgzip.h"
+
+#include <stdlib.h>
+#include <zlib.h>
+
+#define COMPRESSION_LEVEL			Z_BEST_COMPRESSION
+#define EXPAND_COMPRESS_DESTBUF_BYTES		1024
+#define EXPAND_DECOMPRESS_DESTBUF_BYTES		(1024 * 10)
+
+
+bool CompressGzip::compress(string *d)
+{
+	int ret;
+	Bytef *dest;
+	const Bytef *source;
+	unsigned long sourceLen, destLen;
+
+	source = reinterpret_cast<const Bytef *>(d->c_str());
+	sourceLen = d->length();
+	destLen = calcCompressDestLen(sourceLen);
+	dest = static_cast<Bytef *>(malloc(destLen));
+	if (!dest)
+		return false;
+	while (1) {
+		ret = compress2(dest,
+				static_cast<uLongf *>(&destLen),
+				source,
+				static_cast<uLong>(sourceLen),
+				COMPRESSION_LEVEL);
+		switch (ret) {
+		case Z_OK:
+			goto out;
+		case Z_BUF_ERROR:
+			/* we don't use realloc(), because it may
+			 * (in this case) unneccessarily copy the old block
+			 * to the new allocated block.
+			 */
+			free(dest);
+			destLen += EXPAND_COMPRESS_DESTBUF_BYTES;
+			dest = static_cast<Bytef *>(malloc(destLen));
+			if (!dest)
+				return false;
+			break;
+		default:
+			free(dest);
+			return false;
+		}
+	}
+out:
+	d->assign(reinterpret_cast<char *>(dest), destLen);
+	free(dest);
+	return true;
+}
+
+bool CompressGzip::decompress(string *d)
+{
+	int ret;
+	Bytef *dest;
+	const Bytef *source;
+	unsigned long sourceLen, destLen;
+
+	source = reinterpret_cast<const Bytef *>(d->c_str());
+	sourceLen = d->length();
+	destLen = calcDecompressDestLen(sourceLen);
+	dest = static_cast<Bytef *>(malloc(destLen));
+	if (!dest)
+		return false;
+	while (1) {
+		ret = uncompress(dest,
+				 static_cast<uLongf *>(&destLen),
+				 source,
+				 static_cast<uLong>(sourceLen));
+		switch (ret) {
+		case Z_OK:
+			goto out;
+		case Z_BUF_ERROR:
+			/* we don't use realloc(), because it may
+			 * (in this case) unneccessarily copy the old block
+			 * to the new allocated block.
+			 */
+			free(dest);
+			destLen += EXPAND_DECOMPRESS_DESTBUF_BYTES;
+			dest = static_cast<Bytef *>(malloc(destLen));
+			if (!dest)
+				return false;
+			break;
+		default:
+			free(dest);
+			return false;
+		}
+	}
+out:
+	d->assign(reinterpret_cast<char *>(dest), destLen);
+	free(dest);
+	return true;
+}