// Copyright 2010 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include "Common/CommonTypes.h"
#include "Common/FileUtil.h"
#include "Core/ConfigManager.h"
#include "Core/HW/Sram.h"

// english
SRAM sram_dump = {{
	0xFF, 0x6B,
	0x00, 0x91,
	0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00,
	0xFF, 0xFF, 0xFF, 0x40,
	0x00,
	0x00,
	0x00,
	0x2C,
	0x44, 0x4F, 0x4C, 0x50, 0x48, 0x49, 0x4E, 0x53, 0x4C, 0x4F, 0x54, 0x41,
	0x44, 0x4F, 0x4C, 0x50, 0x48, 0x49, 0x4E, 0x53, 0x4C, 0x4F, 0x54, 0x42,
	0x00, 0x00, 0x00, 0x00,
	0x00, 0x00,
	0x00, 0x00,
	0x00, 0x00,
	0x00, 0x00,
	0x00,
	0x00,
	0x6E, 0x6D,
	0x00, 0x00,
	0x00, 0x00
}};

#if 0
// german
SRAM sram_dump_german = {{
	0x1F, 0x66,
	0xE0, 0x96,
	0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00,
	0x04, 0xEA, 0x19, 0x40,
	0x00,
	0x00,
	0x01,
	0x3C,
	0x12, 0xD5, 0xEA, 0xD3, 0x00, 0xFA, 0x2D, 0x33, 0x13, 0x41, 0x26, 0x03,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00,
	0x00, 0x00,
	0x00, 0x00,
	0x00, 0x00,
	0x00, 0x00,
	0x00,
	0x00,
	0x84, 0xFF,
	0x00, 0x00,
	0x00, 0x00
}};
#endif

void InitSRAM()
{
	File::IOFile file(SConfig::GetInstance().m_strSRAM, "rb");
	if (file)
	{
		if (!file.ReadArray(&g_SRAM, 1))
		{
			ERROR_LOG(EXPANSIONINTERFACE,  "EXI IPL-DEV: Could not read all of SRAM");
			g_SRAM = sram_dump;
		}
	}
	else
	{
		g_SRAM = sram_dump;
	}
}

void SetCardFlashID(u8* buffer, u8 card_index)
{
	u64 rand = Common::swap64( *(u64*)&(buffer[12]));
	u8 csum=0;
	for (int i = 0; i < 12; i++)
	{
		rand = (((rand * (u64)0x0000000041c64e6dULL) + (u64)0x0000000000003039ULL) >> 16);
		csum += g_SRAM.flash_id[card_index][i] = buffer[i] - ((u8)rand&0xff);
		rand = (((rand * (u64)0x0000000041c64e6dULL) + (u64)0x0000000000003039ULL) >> 16);
		rand &= (u64)0x0000000000007fffULL;
	}
	g_SRAM.flashID_chksum[card_index] = csum^0xFF;
}

void FixSRAMChecksums()
{
	u16 checksum = 0;
	u16 checksum_inv = 0;
	for (int i = 0x0C; i < 0x14; i += 2)
	{
		int value = (g_SRAM.p_SRAM[i] << 8) + g_SRAM.p_SRAM[i+1];
		checksum += value;
		checksum_inv += value ^ 0xFFFF;
	}
	g_SRAM.checksum = Common::swap16(checksum);
	g_SRAM.checksum_inv = Common::swap16(checksum_inv);
}
