/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

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 3 of the License, or
(at your option) 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/>.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/
/*****************************************************************************
*
*   plLogDecrypt - Used by mantis to decrypt log files
*
***/

#include <stdio.h>
#include "hsTypes.h"
#include "../plStatusLog/plEncryptLogLine.h"

void IProcessFile(const char *path)
{
    char out_path[512];
    strcpy(out_path, path);
    strcat(out_path, ".decrypt");

    FILE * fpIn = fopen(path, "rb");
    FILE * fpOut = fopen(out_path, "w");

    if( fpIn != nil && fpOut != nil)
    {
        UInt8 line[ 2048 ];
        while( !feof( fpIn ) )
        {
            // Read next string
            long pos = ftell(fpIn);
            if( pos == -1L )
                break;
            UInt8 hint = (UInt8)pos;
            UInt16 sizeHint = (UInt16)pos;
            UInt16 size;

            if( stricmp( path + strlen( path ) - 4, ".log" ) == 0 )
            {
                int i;
                for( i = 0; i < 511; i++ )
                {
                    int c = fgetc( fpIn );
                    if( c == EOF || c == hint )
                        break;
                    line[ i ] = (UInt8)c;
                }
                line[ i ] = 0;
                size = i;
            }
            else
            {
                // UInt16 line length is encoded first
                int c = fgetc( fpIn );
                if( c == EOF )
                    break;
                size = ( c & 0xff ) | ( fgetc( fpIn ) << 8 );

                size = size ^ sizeHint;
                
                if( size > sizeof( line ) )
                {
                    hsAssert( size <= sizeof( line ) - 1, "Invalid line size" );
                    break;
                }

                fread( line, 1, size, fpIn );
                line[ size ] = 0;
            }

            plStatusEncrypt::Decrypt( line, size, hint );
            fprintf(fpOut, "%s\n", (const char *)line);
        }
    }

    if (fpIn)
        fclose(fpIn);
    if (fpOut)
        fclose(fpOut);
}

int main(int argc, const char * argv[])
{
    if (argc == 2)
    {
        IProcessFile(argv[1]);
    }

    return 0;
}