// VisualBoyAdvance - Nintendo Gameboy/GameboyAdvance (TM) emulator.
// Copyright (C) 1999-2003 Forgotten
// Copyright (C) 2004-2006 Forgotten and the VBA development team
// Copyright (C) 2007-2008 VBA-M development team and Shay Green
// 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, 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, write to the Free Software Foundation,
// Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <zlib.h>

#include "System.h"
#include "NLS.h"
#include "Util.h"
#include "gba/Flash.h"
#include "gba/GBA.h"
#include "gba/Globals.h"
#include "gba/RTC.h"
#include "common/Port.h"
#include "unzip.h"

extern "C" {
#include "common/memgzio.h"
}

#ifndef _MSC_VER
#define _stricmp strcasecmp
#endif // ! _MSC_VER

extern int systemColorDepth;
extern int systemRedShift;
extern int systemGreenShift;
extern int systemBlueShift;

extern u16 systemColorMap16[0x10000];
//extern u32 systemColorMap32[0x10000];
extern u32 *systemColorMap32;

static int (*utilGzWriteFunc)(gzFile, const voidp, unsigned int) = NULL;
static int (*utilGzReadFunc)(gzFile, voidp, unsigned int) = NULL;
static int (*utilGzCloseFunc)(gzFile) = NULL;
static z_off_t (*utilGzSeekFunc)(gzFile, z_off_t, int) = NULL;

extern bool cpuIsMultiBoot;

bool utilIsGBAImage(const char * file)
{
  cpuIsMultiBoot = false;
  if(strlen(file) > 4) {
    const char * p = strrchr(file,'.');

    if(p != NULL) {
      if((_stricmp(p, ".agb") == 0) ||
         (_stricmp(p, ".gba") == 0) ||
         (_stricmp(p, ".bin") == 0) ||
         (_stricmp(p, ".elf") == 0))
        return true;
      if(_stricmp(p, ".mb") == 0) {
        cpuIsMultiBoot = true;
        return true;
      }
    }
  }

  return false;
}

bool utilIsGBImage(const char * file)
{
  if(strlen(file) > 4) {
    const char * p = strrchr(file,'.');

    if(p != NULL) {
      if((_stricmp(p, ".dmg") == 0) ||
         (_stricmp(p, ".gb") == 0) ||
         (_stricmp(p, ".gbc") == 0) ||
         (_stricmp(p, ".cgb") == 0) ||
         (_stricmp(p, ".sgb") == 0))
        return true;
    }
  }

  return false;
}

bool utilIsZipFile(const char *file)
{
  if(strlen(file) > 4)
    {
      char * p = strrchr(file,'.');

      if(p != NULL)
        {
          if(_stricmp(p, ".zip") == 0)
            return true;
        }
    }

  return false;
}

void utilPutDword(u8 *p, u32 value)
{
  *p++ = value & 255;
  *p++ = (value >> 8) & 255;
  *p++ = (value >> 16) & 255;
  *p = (value >> 24) & 255;
}

void utilPutWord(u8 *p, u16 value)
{
  *p++ = value & 255;
  *p = (value >> 8) & 255;
}

void utilWriteInt(gzFile gzFile, int i)
{
  utilGzWrite(gzFile, &i, sizeof(int));
}

int utilReadInt(gzFile gzFile)
{
  int i = 0;
  utilGzRead(gzFile, &i, sizeof(int));
  return i;
}

void utilReadData(gzFile gzFile, variable_desc* data)
{
  while(data->address) {
    utilGzRead(gzFile, data->address, data->size);
    data++;
  }
}

void utilReadDataSkip(gzFile gzFile, variable_desc* data)
{
  while(data->address) {
    utilGzSeek(gzFile, data->size, SEEK_CUR);
    data++;
  }
}

void utilWriteData(gzFile gzFile, variable_desc *data)
{
  while(data->address) {
    utilGzWrite(gzFile, data->address, data->size);
    data++;
  }
}

gzFile utilGzOpen(const char *file, const char *mode)
{
  utilGzWriteFunc = (int (*)(void *,void * const, unsigned int))gzwrite;
  utilGzReadFunc = gzread;
  utilGzCloseFunc = gzclose;
  utilGzSeekFunc = gzseek;

  return gzopen(file, mode);
}

gzFile utilMemGzOpen(char *memory, int available, const char *mode)
{
  utilGzWriteFunc = memgzwrite;
  utilGzReadFunc = memgzread;
  utilGzCloseFunc = memgzclose;

  return memgzopen(memory, available, mode);
}

int utilGzWrite(gzFile file, const voidp buffer, unsigned int len)
{
  return utilGzWriteFunc(file, buffer, len);
}

int utilGzRead(gzFile file, voidp buffer, unsigned int len)
{
  return utilGzReadFunc(file, buffer, len);
}

int utilGzClose(gzFile file)
{
  return utilGzCloseFunc(file);
}

z_off_t utilGzSeek(gzFile file, z_off_t offset, int whence)
{
	return utilGzSeekFunc(file, offset, whence);
}

long utilGzMemTell(gzFile file)
{
  return memtell(file);
}