dfhack/library/deprecated/LoadSave.cpp

/*
www.sourceforge.net/projects/dfhack
Copyright (c) 2009 Petr Mrázek (peterix), Kenneth Ferland (Impaler[WrG]), dorf

This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any
damages arising from the use of this software.

Permission is granted to anyone to use this software for any
purpose, including commercial applications, and to alter it and
redistribute it freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must
not claim that you wrote the original software. If you use this
software in a product, an acknowledgment in the product documentation
would be appreciated but is not required.

2. Altered source versions must be plainly marked as such, and
must not be misrepresented as being the original software.

3. This notice may not be removed or altered from any source
distribution.
*/

#include "DFCommon.h"
#include "DfMap.h"
#include "DfMapHeader.h"
#include "ZlibHelper.h"


bool DfMap::write(string FilePath)
{
    FILE *SaveFile;
    SaveFile = fopen(FilePath.c_str(),"wb");
    DfMapHeader df_map_header;

    if(SaveFile == NULL)
    {
        printf("Can\'t create file for write.\n");
        return false;
    }
    else
    {
        // gather information to fill dfmapheader
        strcpy(df_map_header.identifier, dmh_id);
        df_map_header.version = dmh_ver;
        df_map_header.reserved = 0/*sizeof(DfMapHeader)*/;
        
        // save map header
        fwrite(&df_map_header, sizeof(DfMapHeader), 1, SaveFile);
        
        // save map
        writeVersion1(SaveFile);
    }

    // reopen file for reading
    freopen (FilePath.c_str(),"rb",SaveFile);
    if(SaveFile == NULL)
    {
        printf("Can\'t create file for read.\n");
        return false;
    }

    FILE *SaveCompressedFile;
    string CompressedFilePath = FilePath + ".comp";

    SaveCompressedFile = fopen(CompressedFilePath.c_str(),"wb");
    if(SaveCompressedFile == NULL)
    {
        printf("Can\'t create a compressed file for write\n");
        return false;
    }

    // compress
    printf("Compressing... ");
    int ret = def(SaveFile, SaveCompressedFile, Z_BEST_COMPRESSION);
    if (ret != Z_OK)
    {
        zerr(ret);
    }
    printf("DONE\n");

    fclose(SaveFile);
    fclose(SaveCompressedFile);
    remove(FilePath.c_str());
    rename(CompressedFilePath.c_str(), FilePath.c_str());
    return true;
}

bool DfMap::load(string FilePath)
{
    string DecompressedFilePath = FilePath + ".decomp";
    FILE *ToDecompress;
    FILE *Decompressed;
    DfMapHeader df_map_header;
    bool isok = false;

    // open file for writing decompressed data
    Decompressed = fopen(DecompressedFilePath.c_str(), "wb");
    if  (Decompressed == NULL)
    {
        printf("Can\'t open a decompressed file for write.\n");
        return false;
    }
    
    // open compressed file
    ToDecompress = fopen(FilePath.c_str(),"rb");
    if  (ToDecompress == NULL)
    {
        printf("Can\'t open file for read.\n");
        return false;
    }

    // decompress
    printf("Decompressing... ");
    int ret = inf(/*source*/ToDecompress,/*destination*/Decompressed);

    printf("DONE\n");

    if (ret != Z_OK)
    {
        zerr(ret);
    }

    // OK, close file with compressed data
    fclose(ToDecompress);
    
    // reopen decompressed file for reading
    freopen(DecompressedFilePath.c_str(), "rb", Decompressed);
    if  (Decompressed == NULL)
    {
        printf("Can\'t create decompressed file for read.\n");
        return false;
    }

    // check, if the file is big enough to contain the header
    fseek(Decompressed, 0, SEEK_END);

    if (ftell(Decompressed) < (int32_t)sizeof(DfMapHeader))
    {
    	printf("This Khazad map file is corrupted - file too small.\n");
    	return false;
    }

    // read the header
    fseek(Decompressed, 0, SEEK_SET);
    fread(&df_map_header, sizeof(DfMapHeader), 1, Decompressed);

    // check, if it's a Khazad map file
    if (strcmp(df_map_header.identifier,dmh_id) != 0)
    {
    	printf("This file is not a Khazad map file.\n");
    	return false;
    }
    
    // ALERT: flush all map data. This is very important.
    clear();
    
    switch(df_map_header.version)
    {
        /*
            Basic format without matgloss. Kept for compatibility reasons.
            Saved from version 0.0.5
        */
        case 1:
            isok = loadVersion1(Decompressed, df_map_header);
            break;
        
        /*
            v2 format
            Saved from some SVN version. this format is dead
        */
        case 2:
            //isok = loadVersion2(Decompressed, df_map_header);
            isok = false;
            break;
        
        default:
            printf("Unknown Khazad map file version(%3d).\n", df_map_header.version);
            isok = false;
            break;
    }
    
    // close decompressed file and delete it
    fclose(Decompressed);
    remove(DecompressedFilePath.c_str());
    return isok;
}