#include <linux/version.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kobject.h>
#include <linux/errno.h>
#include <linux/sysfs.h>
#include <linux/syscalls.h>
#include "defines.h"
#include "kfirmware.h"
#include "sfsattrib.h"
#include "ksync.h"

/////////////////////////////////////////////////////////////////////////////

static unsigned int g_pdw32CRC32Table[] =
{
	0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
	0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
	0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
	0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
	0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
	0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
	0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
	0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
	0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
	0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
	0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
	0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
	0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
	0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
	0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
	0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
	0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
	0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
	0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
	0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
	0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
	0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
	0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
	0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
	0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
	0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
	0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
	0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
	0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
	0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
	0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
	0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
};

static TIVA_UPLOAD_INFO g_tui;

/////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////

static unsigned int _CalcCRC32(const void *pData, size_t nCbData, unsigned int dwCRC32)
{
    unsigned char ui8Char;
    const unsigned char *pbData = (const unsigned char*)pData;

    while(nCbData--)
    {
        ui8Char = *pbData++;
        dwCRC32 = (dwCRC32 >> 8) ^ g_pdw32CRC32Table[(dwCRC32 & 0xFF) ^ ui8Char];
    }

    return dwCRC32;
}

/////////////////////////////////////////////////////////////////////////////

static uint32_t _CalcImgCRC32(const void *pImg, LPCKFW_IMG_HEADER paih)
{
	const void *pSection1 = pImg;
	const void *pSection2 = paih->nReserved;
	size_t nCbSection1 = (void*)&paih->nImgCRC32 - pSection1;
	size_t nCbSection2 = paih->nImgLength - nCbSection1 - 4;

	uint32_t nCRC32 = 0xffffffff;
	nCRC32 = _CalcCRC32(pSection1, nCbSection1, nCRC32);
	nCRC32 = _CalcCRC32(pSection2, nCbSection2, nCRC32);
	nCRC32 ^= 0xffffffff;
	return nCRC32;
}

/////////////////////////////////////////////////////////////////////////////

static bool _MatchWildcardStrings(const char *pszMatNumEEPROM, const char *pszMatNumImg, size_t nRequiredLength)
{
	size_t nLen = 0;
	char cEEPROM, cImg;

	while(*pszMatNumEEPROM)
	{
		cImg	= *pszMatNumImg++;
		cEEPROM	= *pszMatNumEEPROM++;
		if((cImg != cEEPROM) && (cImg != '*'))
			return false;
		++nLen;
	}

	return nLen == nRequiredLength;
}

/////////////////////////////////////////////////////////////////////////////

bool KfwMatchMaterialNum(const char *pszMatNumEEPROM, const char *pszMatNumImg)
{
	if(pszMatNumEEPROM && pszMatNumImg)
		return _MatchWildcardStrings(pszMatNumEEPROM, pszMatNumImg, KFW_MAX_IMG_MATERIAL_NUM_LENGTH - 1);
	return false;
}

/////////////////////////////////////////////////////////////////////////////

LPCKFW_IMG_HEADER KfwLookupImgHeader(const void *pData, size_t nCbData)
{
	int i;
	const unsigned int *pImg = (const unsigned int*)pData;

	if(nCbData > (257 * sizeof(unsigned int)))
	{
		for(i = 0; i < 257; ++i, nCbData -= sizeof(unsigned int))
		{
			LPKFW_IMG_HEADER paih = (LPKFW_IMG_HEADER)pImg++;

			if(	(paih->nPrefix0 == KFW_IMG_HEADER_PREFIX_0) &&
				(paih->nPrefix1 == KFW_IMG_HEADER_PREFIX_1))
			{
				if(nCbData >= sizeof(KFW_IMG_HEADER))
					return paih;
				break;
			}
		}
	}

	return NULL;
}

/////////////////////////////////////////////////////////////////////////////

int KfwOnDataDropped(const void *pData, size_t nCbData, LPKFW_DROP_CTX pdc)
{
//	ksync_lock();
//	memset(&g_tui, 0, sizeof(g_tui));
//	ksync_unlock();
	atomic_set(&g_tui.flgUIReady, 0);

	if(nCbData > (257 * sizeof(unsigned int)))
	{
		unsigned int dwCRC32;
		ssize_t nOffsetMat, nOffsetBld;

		if(!pdc->pkih)
		{
			if(!(pdc->pkih = KfwLookupImgHeader(pData, nCbData)))
			{
				KALERT("%s: No Image header found!\n", __FUNCTION__);
				return -EPERM;
			}
		}

		if(nCbData == pdc->pkih->nImgLength)
		{
			dwCRC32 = _CalcImgCRC32(pData, pdc->pkih);
			KALERT("%s: DataLen: %zu, ImgLen: %zu\n", __FUNCTION__, nCbData, pdc->pkih->nImgLength);
			KALERT("%s: DataCRC: %08X, ImgCRC: %08X\n", __FUNCTION__, dwCRC32, pdc->pkih->nImgCRC32);
			
			if(pdc->pkih->nImgCRC32 != dwCRC32)
			{
				KALERT("%s: Invalid CRC32: %08X\n", __FUNCTION__, pdc->pkih->nImgCRC32);
				return -EPERM;
			}

			nOffsetMat = (ssize_t)pdc->pkih->app.pszImgMaterialNum;// - KFW_DEFAULT_BASE_ADDRESS;
			nOffsetBld = (ssize_t)pdc->pkih->app.pszImgNameBuild;//   - KFW_DEFAULT_BASE_ADDRESS;

			if(	(nOffsetMat > 0) && (((size_t)nOffsetMat + KFW_MAX_IMG_MATERIAL_NUM_LENGTH) <= nCbData) &&
				(nOffsetBld > 0) && (((size_t)nOffsetBld + KFW_MAX_IMG_NAME_BUILD_LENGTH) <= nCbData))
			{
				const char *pszMat = ((const char*)pData) + nOffsetMat;
				const char *pszBld = ((const char*)pData) + nOffsetBld;

				KALERT("%s: Material-Nr.: %s\n", __FUNCTION__, pszMat);
				KALERT("%s: Build-Nr.:    %s\n", __FUNCTION__, pszBld);

				SfAttLockFirmware(true);

				ksync_lock();
				g_tui.pData		= pData;
				g_tui.nCbData	= nCbData;
				g_tui.pkih		= pdc->pkih;
				g_tui.pszMat	= pszMat;
				g_tui.pszBld	= pszBld;
				ksync_unlock();

				atomic_set(&g_tui.flgUIReady, 1);
				KALERT("%s: Image ready for upload!\n", __FUNCTION__);
				return 1;
			}
			else
			{
				KALERT("%s: Offs.Mat: %zd, Offs.Build: %zd, ImgLength: %zu\n", __FUNCTION__, nOffsetMat, nOffsetBld, nCbData);
			}
		}
		else if(nCbData > pdc->pkih->nImgLength)
		{
			KALERT("%s: Invalid Imgae-length: %u\n", __FUNCTION__, pdc->pkih->nImgLength);
			return -EILSEQ;
		}
	}

	return 0;
}

/////////////////////////////////////////////////////////////////////////////

bool KfwUploadInfoReady(void)
{
	return !!atomic_read(&g_tui.flgUIReady);
}

/////////////////////////////////////////////////////////////////////////////

bool KfwQueryUploadInfo(LPTIVA_UPLOAD_INFO ptui)
{
	if(ptui)
	{
		bool bRet;
		ksync_lock();
		memcpy(ptui, &g_tui, sizeof(g_tui));
		ksync_unlock();
		if((bRet = !!ptui->pData && !!ptui->pkih && !!ptui->nCbData))
		{
			memset(&g_tui, 0, sizeof(g_tui));
			atomic_set(&g_tui.flgUIReady, 0);
		}
		return bRet;
	}

	return false;
}