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/*
* The Mana Client
* Copyright (C) 2004-2009 The Mana World Development Team
* Copyright (C) 2009-2012 The Mana Developers
*
* This file is part of The Mana Client.
*
* This program 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
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "utils/zlib.h"
#include "log.h"
#include <cassert>
#include <cstdlib>
#include <fstream>
#include <iostream>
#include <zlib.h>
/**
* Inflates either zlib or gzip deflated memory. The inflated memory is
* expected to be freed by the caller.
*/
int inflateMemory(unsigned char *in, unsigned int inLength,
unsigned char *&out, unsigned int &outLength)
{
int bufferSize = 256 * 1024;
int ret;
z_stream strm;
out = (unsigned char*) malloc(bufferSize);
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.next_in = in;
strm.avail_in = inLength;
strm.next_out = out;
strm.avail_out = bufferSize;
ret = inflateInit2(&strm, 15 + 32);
if (ret != Z_OK)
return ret;
do
{
if (strm.next_out == nullptr)
{
inflateEnd(&strm);
return Z_MEM_ERROR;
}
ret = inflate(&strm, Z_NO_FLUSH);
assert(ret != Z_STREAM_ERROR);
switch (ret)
{
case Z_NEED_DICT:
ret = Z_DATA_ERROR;
case Z_DATA_ERROR:
case Z_MEM_ERROR:
(void) inflateEnd(&strm);
return ret;
}
if (ret != Z_STREAM_END)
{
out = (unsigned char*) realloc(out, bufferSize * 2);
if (out == nullptr)
{
inflateEnd(&strm);
return Z_MEM_ERROR;
}
strm.next_out = out + bufferSize;
strm.avail_out = bufferSize;
bufferSize *= 2;
}
}
while (ret != Z_STREAM_END);
assert(strm.avail_in == 0);
outLength = bufferSize - strm.avail_out;
(void) inflateEnd(&strm);
return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
}
int inflateMemory(unsigned char *in, unsigned int inLength,
unsigned char *&out)
{
unsigned int outLength = 0;
int ret = inflateMemory(in, inLength, out, outLength);
if (ret != Z_OK || out == nullptr)
{
if (ret == Z_MEM_ERROR)
{
logger->log("Error: Out of memory while decompressing data!");
}
else if (ret == Z_VERSION_ERROR)
{
logger->log("Error: Incompatible zlib version!");
}
else if (ret == Z_DATA_ERROR)
{
logger->log("Error: Incorrect zlib compressed data!");
}
else
{
logger->log("Error: Unknown error while decompressing data!");
}
free(out);
out = nullptr;
outLength = 0;
}
return outLength;
}
void *loadCompressedFile(const std::string &filename, int &filesize)
{
std::ifstream file;
file.open(filename.c_str(), std::ios::in);
if (file.is_open())
{
// Get length of file
file.seekg (0, std::ios::end);
filesize = file.tellg();
file.seekg(0, std::ios::beg);
char *buffer = (char *) malloc(filesize);
file.read(buffer, filesize);
file.close();
unsigned char *inflated;
unsigned int inflatedSize;
if (filename.find(".gz", filename.length() - 3) != std::string::npos)
{
// Inflate the gzipped map data
inflatedSize =
inflateMemory((unsigned char*) buffer, filesize, inflated);
free(buffer);
if (!inflated)
{
logger->log("Could not decompress file: %s",
filename.c_str());
return nullptr;
}
filesize = inflatedSize;
return inflated;
}
else
{
return buffer;
}
}
else
{
logger->log("Error loading file from drive: %s", filename.c_str());
}
return nullptr;
}
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