/*==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;
}