//-----------------------------------------------------------------------------
// TmxUtil.cpp
//
// Copyright (c) 2010-2012, Tamir Atias
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//  * Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//  * Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL TAMIR ATIAS BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Author: Tamir Atias
//-----------------------------------------------------------------------------
#include <stdlib.h>
#include <zlib.h>

#include "TmxUtil.h"
#include "base64.h"

namespace Tmx {
	std::string Util::DecodeBase64(const std::string &str) 
	{
		return base64_decode(str);
	}

	char *Util::DecompressGZIP(const char *data, int dataSize, int expectedSize) 
	{
		int bufferSize = expectedSize;
		int ret;
		z_stream strm;
		char *out = (char*)malloc(bufferSize);

		strm.zalloc = Z_NULL;
		strm.zfree = Z_NULL;
		strm.opaque = Z_NULL;
		strm.next_in = (Bytef*)data;
		strm.avail_in = dataSize;
		strm.next_out = (Bytef*)out;
		strm.avail_out = bufferSize;

		ret = inflateInit2(&strm, 15 + 32);

		if (ret != Z_OK) 
		{
			free(out);
			return NULL;
		}

		do 
		{
			ret = inflate(&strm, Z_SYNC_FLUSH);

			switch (ret) 
			{
				case Z_NEED_DICT:
				case Z_STREAM_ERROR:
					ret = Z_DATA_ERROR;
				case Z_DATA_ERROR:
				case Z_MEM_ERROR:
					inflateEnd(&strm);
					free(out);
					return NULL;
			}

			if (ret != Z_STREAM_END) 
			{
				out = (char *) realloc(out, bufferSize * 2);

				if (!out) 
				{
					inflateEnd(&strm);
					free(out);
					return NULL;
				}

				strm.next_out = (Bytef *)(out + bufferSize);
				strm.avail_out = bufferSize;
				bufferSize *= 2;
			}
		}
		while (ret != Z_STREAM_END);

		if (strm.avail_in != 0) 
		{
			free(out);
			return NULL;
		}

		inflateEnd(&strm);

		return out;
	}
};