val = 0;	len = 0;	if ((i & 0xC0) == 0) {	    /* code 00 */	    val = 0;	    len = 2;	} else if ((i & 0xC0) == 0x40) {	    /* code 01 */	    val = -5;	    len = 2;	} else if ((i & 0xC0) == 0x80) {	    /* code 10 */	    val = +5;	    len = 2;	} else if ((i & 0xF0) == 0xC0) {	    /* code 1100 */	    val = -10;	    len = 4;	} else if ((i & 0xF0) == 0xD0) {	    /* code 1101 */	    val = +10;	    len = 4;	} else if ((i & 0xF8) == 0xE0) {	    /* code 11100 */	    val = -15;	    len = 5;	} else if ((i & 0xF8) == 0xE8) {	    /* code 11101 */	    val = +15;	    len = 5;	} else if ((i & 0xFC) == 0xF0) {	    /* code 111100 */	    val = -20;	    len = 6;	} else if ((i & 0xFC) == 0xF4) {	    /* code 111101 */	    val = +20;	    len = 6;	} else if ((i & 0xF8) == 0xF8) {	    /* code 11111xxxxxx */	    is_abs = 1;	    val = 0;	    len = 5;	}	table[i].is_abs = is_abs;	table[i].val = val;	table[i].len = len;    }}static intpac_decompress_row(struct code_table_t *table, unsigned char *inp,		   unsigned char *outp, int width){    int col;    int val;    int bitpos;    unsigned char code;    /* first two pixels are stored as raw 8-bit */    *outp++ = inp[2];    *outp++ = inp[3];    bitpos = 32;    /* main decoding loop */    for (col = 2; col < width; col++) {	/* get bitcode */	code = getByte(inp, bitpos);	bitpos += table[code].len;	/* calculate pixel value */	if (table[code].is_abs) {	    /* absolute value: get 6 more bits */	    code = getByte(inp, bitpos);	    bitpos += 6;	    *outp++ = code & 0xFC;	} else {	    /* relative to left pixel */	    val = outp[-2] + table[code].val;	    *outp++ = CLIP(val);	}    }    /* return line length, rounded up to next 16-bit word */    return 2 * ((bitpos + 15) / 16);}#if 0static void tv8532_preprocess(struct spca50x_frame *myframe){/* we should received a whole frame with header and EOL markerin myframe->data and return a GBRG pattern in frame->tmpbuffer sequence 2bytes header the Alternate pixels bayer GB 4 bytes Alternate pixels bayer RG 4 bytes EOL */    int width = myframe->hdrwidth;    int height = myframe->hdrheight;    int src = 0;    unsigned char *dst = myframe->tmpbuffer;    unsigned char *data = myframe->data;    int i;    int seq1, seq2;    /* precompute where is the good bayer line */    if ((((data[src + 3] + data[src + width + 7]) >> 1) +	 (data[src + 4] >> 2) + (data[src + width + 6] >> 1)) >=	(((data[src + 2] + data[src + width + 6]) >> 1) +	 (data[src + 3] >> 2) + (data[src + width + 5] >> 1))) {	seq1 = 3;	seq2 = 4;    } else {	seq1 = 2;	seq2 = 5;    }    for (i = 0; i < height / 2; i++) {	src += seq1;	memcpy(dst, &myframe->data[src], width);	src += (width + 3);	dst += width;	memcpy(dst, &myframe->data[src], width);	src += (width + seq2);	dst += width;    }}#endif static inline unsigned char  cabs_diff(unsigned char a,unsigned char b){	return a>=b?a-b:b-a;};static void tv8532_preprocess(struct spca50x_frame *myframe){/* we should received a whole frame with header and EOL markerin myframe->data and return a GBRG pattern in frame->tmpbuffer sequence 2bytes header the Alternate pixels bayer GB 4 bytes Alternate pixels bayer RG 4 bytes EOL */	int width = myframe->hdrwidth;	int height = myframe->hdrheight;	int src = 0;	unsigned char *dst = myframe->tmpbuffer;	unsigned char *data = myframe->data;	unsigned char * data_ptr;	int seq1, seq2;	int sum1=0,sum2=0;	int height_inc=height/6-1;	int width_inc=width/6-1;	int i,j;	for(i=0;i<4;i++) 		for(j=0;j<4;j++)		{			data_ptr=&data[(i*height_inc)*(width*2+10)+width_inc*j*2];			sum1+=cabs_diff(data_ptr[3],data_ptr[width + 7])+				cabs_diff(data_ptr[5],data_ptr[width + 7])+				cabs_diff(data_ptr[2*width+13],data_ptr[width + 7])+				cabs_diff(data_ptr[2*width+15],data_ptr[width + 7]);			sum2+=cabs_diff(data_ptr[width + 6],data_ptr[4])+				cabs_diff(data_ptr[width + 6],data_ptr[2*width+14])+				cabs_diff(data_ptr[width + 8],data_ptr[4])+				cabs_diff(data_ptr[width + 8],data_ptr[2*width+14]);			};	/* precompute where is the good bayer line */	if (sum1 <=sum2) {		seq1 = 3;		seq2 = 4;	} else {		seq1 = 2;		seq2 = 5;	};	for (i = 0; i < height / 2; i++) {		src += seq1;		memcpy(dst, &myframe->data[src], width);		src += (width + 3);		dst += width;		memcpy(dst, &myframe->data[src], width);		src += (width + seq2);		dst += width;	}}static inline unsigned short getShort(unsigned char *pt){    return ((pt[0] << 8) | pt[1]);}static int pixart_decompress(struct spca50x_frame *myframe){/* we should received a whole frame with header and EOL markerin myframe->data and return a GBRG pattern in frame->tmpbufferremove the header then copy line by line EOL is set with 0x0f 0xf0 markeror 0x1e 0xe1 for compressed line*/    int width = myframe->hdrwidth;    int height = myframe->hdrheight;    unsigned char *outp = myframe->tmpbuffer;    unsigned char *inp = myframe->data;    struct code_table_t *table = myframe->decoder->table;    unsigned short word;    int row;    /* skip header */    inp += 16;    /* and ask to go at pixel +1 ?? */    outp++;    /* iterate over all rows */    for (row = 0; row < height; row++) {	word = getShort(inp);	switch (word) {	case 0x0FF0:	    memcpy(outp, inp + 2, width);	    inp += (2 + width);	    break;	case 0x1EE1:	    inp += pac_decompress_row(table, inp, outp, width);	    break;	default:	    return -1;	}	outp += width;    }    return 0;}/*#	Decoder for compressed spca561 images			    		##	It was developed for "Labtec WebCam Elch 2(SPCA561A)" (046d:0929)	##	but it might work with other spca561 cameras				#*/static unsigned int bit_bucket;static unsigned char *input_ptr;static inline void refill(int *bitfill){    if (*bitfill < 8) {	bit_bucket = (bit_bucket << 8) | *(input_ptr++);	*bitfill += 8;    }}static inline int nbits(int *bitfill, int n){    bit_bucket = (bit_bucket << 8) | *(input_ptr++);    *bitfill -= n;    return (bit_bucket >> (*bitfill & 0xff)) & ((1 << n) - 1);}static inline int _nbits(int *bitfill, int n){    *bitfill -= n;    return (bit_bucket >> (*bitfill & 0xff)) & ((1 << n) - 1);}static int fun_A(int *bitfill){    int ret;    static int tab[] =	{ 12, 13, 14, 15, 16, 17, 18, 19, -12, -13, -14, -15, -16, -17,	-18, -19, -19    };    ret = tab[nbits(bitfill, 4)];    refill(bitfill);    return ret;}static int fun_B(int *bitfill){    static int tab1[] =	{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 31, 31,	31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 16, 17,	18,	19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30    };    static int tab[] =	{ 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, -5,	-6, -7, -8, -9, -10, -11, -12, -13, -14, -15, -16, -17, -18, -19    };    unsigned int tmp;    tmp = nbits(bitfill, 7) - 68;    refill(bitfill);    if (tmp > 47)	return 0xff;    return tab[tab1[tmp]];}static int fun_C(int *bitfill, int gkw){    static int tab1[] =	{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 23, 23, 23, 23, 23, 23,	23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 12, 13,	14,	15, 16, 17, 18, 19, 20, 21, 22    };    static int tab[] =	{ 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, -9, -10, -11,	-12, -13, -14, -15, -16, -17, -18, -19    };    unsigned int tmp;    if (gkw == 0xfe) {	if (nbits(bitfill, 1) == 0)	    return 7;	else	    return -8;    }    if (gkw != 0xff)	return 0xff;    tmp = nbits(bitfill, 7) - 72;    if (tmp > 43)	return 0xff;    refill(bitfill);    return tab[tab1[tmp]];}static int fun_D(int *bitfill, int gkw){    if (gkw == 0xfd) {	if (nbits(bitfill, 1) == 0)	    return 12;	else	    return -13;    }    if (gkw == 0xfc) {	if (nbits(bitfill, 1) == 0)	    return 13;	else	    return -14;    }    if (gkw == 0xfe) {	switch (nbits(bitfill, 2)) {	case 0:	    return 14;	case 1:	    return -15;	case 2:	    return 15;	case 3:	    return -16;	}    }    if (gkw == 0xff) {	switch (nbits(bitfill, 3)) {	case 4:	    return 16;	case 5:	    return -17;	case 6:	    return 17;	case 7:	    return -18;	case 2:	    return _nbits(bitfill, 1) ? 0xed : 0x12;	case 3:	    *bitfill--;	    return 18;	}	return 0xff;    }    return gkw;}static int fun_E(int cur_byte, int *bitfill){    static int tab0[] = { 0, -1, 1, -2, 2, -3, 3, -4 };    static int tab1[] = { 4, -5, 5, -6, 6, -7, 7, -8 };    static int tab2[] = { 8, -9, 9, -10, 10, -11, 11, -12 };    static int tab3[] = { 12, -13, 13, -14, 14, -15, 15, -16 };    static int tab4[] = { 16, -17, 17, -18, 18, -19, 19, -19 };    if ((cur_byte & 0xf0) >= 0x80) {	*bitfill -= 4;	return tab0[(cur_byte >> 4) & 7];    } else if ((cur_byte & 0xc0) == 0x40) {	*bitfill -= 5;	return tab1[(cur_byte >> 3) & 7];    } else if ((cur_byte & 0xe0) == 0x20) {	*bitfill -= 6;	return tab2[(cur_byte >> 2) & 7];    } else if ((cur_byte & 0xf0) == 0x10) {	*bitfill -= 7;	return tab3[(cur_byte >> 1) & 7];    } else if ((cur_byte & 0xf8) == 8) {	*bitfill -= 8;	return tab4[cur_byte & 7];    }    return 0xff;}static int fun_F(int cur_byte, int *bitfill){    *bitfill -= 5;    switch (cur_byte & 0xf8) {    case 0x80:	return 0;    case 0x88:	return -1;    case 0x90:	return 1;    case 0x98:	return -2;    case 0xa0:	return 2;    case 0xa8:	return -3;    case 0xb0:	return 3;    case 0xb8:	return -4;    case 0xc0:	return 4;    case 0xc8:	return -5;    case 0xd0:	return 5;    case 0xd8:	return -6;    case 0xe0:	return 6;    case 0xe8:	return -7;    case 0xf0:	return 7;    case 0xf8:	return -8;    }    *bitfill -= 1;    switch (cur_byte & 0xfc) {    case 0x40:	return 8;    case 0x44:	return -9;    case 0x48: