[wxWidgets.git] / src / tiff / libtiff / tif_swab.c


/*
 * Copyright (c) 1988-1997 Sam Leffler
 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and 
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the names of
 * Sam Leffler and Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Sam Leffler and Silicon Graphics.
 * 
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
 * 
 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
 * OF THIS SOFTWARE.
 */

/*
 * TIFF Library Bit & Byte Swapping Support.
 *
 * XXX We assume short = 16-bits and long = 32-bits XXX
 */
#include "tiffiop.h"

#ifndef TIFFSwabShort
void
TIFFSwabShort(uint16* wp)
{
	register unsigned char* cp = (unsigned char*) wp;
	unsigned char t;
	assert(sizeof(uint16)==2);
	t = cp[1]; cp[1] = cp[0]; cp[0] = t;
}
#endif

#ifndef TIFFSwabLong
void
TIFFSwabLong(uint32* lp)
{
	register unsigned char* cp = (unsigned char*) lp;
	unsigned char t;
	assert(sizeof(uint32)==4);
	t = cp[3]; cp[3] = cp[0]; cp[0] = t;
	t = cp[2]; cp[2] = cp[1]; cp[1] = t;
}
#endif

#ifndef TIFFSwabLong8
void
TIFFSwabLong8(uint64* lp)
{
	register unsigned char* cp = (unsigned char*) lp;
	unsigned char t;
	assert(sizeof(uint64)==8);
	t = cp[7]; cp[7] = cp[0]; cp[0] = t;
	t = cp[6]; cp[6] = cp[1]; cp[1] = t;
	t = cp[5]; cp[5] = cp[2]; cp[2] = t;
	t = cp[4]; cp[4] = cp[3]; cp[3] = t;
}
#endif

#ifndef TIFFSwabArrayOfShort
void
TIFFSwabArrayOfShort(register uint16* wp, tmsize_t n)
{
	register unsigned char* cp;
	register unsigned char t;
	assert(sizeof(uint16)==2);
	/* XXX unroll loop some */
	while (n-- > 0) {
		cp = (unsigned char*) wp;
		t = cp[1]; cp[1] = cp[0]; cp[0] = t;
		wp++;
	}
}
#endif

#ifndef TIFFSwabArrayOfTriples
void
TIFFSwabArrayOfTriples(register uint8* tp, tmsize_t n)
{
	unsigned char* cp;
	unsigned char t;

	/* XXX unroll loop some */
	while (n-- > 0) {
		cp = (unsigned char*) tp;
		t = cp[2]; cp[2] = cp[0]; cp[0] = t;
		tp += 3;
	}
}
#endif

#ifndef TIFFSwabArrayOfLong
void
TIFFSwabArrayOfLong(register uint32* lp, tmsize_t n)
{
	register unsigned char *cp;
	register unsigned char t;
	assert(sizeof(uint32)==4);
	/* XXX unroll loop some */
	while (n-- > 0) {
		cp = (unsigned char *)lp;
		t = cp[3]; cp[3] = cp[0]; cp[0] = t;
		t = cp[2]; cp[2] = cp[1]; cp[1] = t;
		lp++;
	}
}
#endif

#ifndef TIFFSwabArrayOfLong8
void
TIFFSwabArrayOfLong8(register uint64* lp, tmsize_t n)
{
	register unsigned char *cp;
	register unsigned char t;
	assert(sizeof(uint64)==8);
	/* XXX unroll loop some */
	while (n-- > 0) {
		cp = (unsigned char *)lp;
		t = cp[7]; cp[7] = cp[0]; cp[0] = t;
		t = cp[6]; cp[6] = cp[1]; cp[1] = t;
		t = cp[5]; cp[5] = cp[2]; cp[2] = t;
		t = cp[4]; cp[4] = cp[3]; cp[3] = t;
		lp++;
	}
}
#endif

#ifndef TIFFSwabFloat
void
TIFFSwabFloat(float* fp)
{
	register unsigned char* cp = (unsigned char*) fp;
	unsigned char t;
	assert(sizeof(float)==4);
	t = cp[3]; cp[3] = cp[0]; cp[0] = t;
	t = cp[2]; cp[2] = cp[1]; cp[1] = t;
}
#endif

#ifndef TIFFSwabArrayOfFloat
void
TIFFSwabArrayOfFloat(register float* fp, tmsize_t n)
{
	register unsigned char *cp;
	register unsigned char t;
	assert(sizeof(float)==4);
	/* XXX unroll loop some */
	while (n-- > 0) {
		cp = (unsigned char *)fp;
		t = cp[3]; cp[3] = cp[0]; cp[0] = t;
		t = cp[2]; cp[2] = cp[1]; cp[1] = t;
		fp++;
	}
}
#endif

#ifndef TIFFSwabDouble
void
TIFFSwabDouble(double *dp)
{
	register unsigned char* cp = (unsigned char*) dp;
	unsigned char t;
	assert(sizeof(double)==8);
	t = cp[7]; cp[7] = cp[0]; cp[0] = t;
	t = cp[6]; cp[6] = cp[1]; cp[1] = t;
	t = cp[5]; cp[5] = cp[2]; cp[2] = t;
	t = cp[4]; cp[4] = cp[3]; cp[3] = t;
}
#endif

#ifndef TIFFSwabArrayOfDouble
void
TIFFSwabArrayOfDouble(double* dp, tmsize_t n)
{
	register unsigned char *cp;
	register unsigned char t;
	assert(sizeof(double)==8);
	/* XXX unroll loop some */
	while (n-- > 0) {
		cp = (unsigned char *)dp;
		t = cp[7]; cp[7] = cp[0]; cp[0] = t;
		t = cp[6]; cp[6] = cp[1]; cp[1] = t;
		t = cp[5]; cp[5] = cp[2]; cp[2] = t;
		t = cp[4]; cp[4] = cp[3]; cp[3] = t;
		dp++;
	}
}
#endif

/*
 * Bit reversal tables.  TIFFBitRevTable[<byte>] gives
 * the bit reversed value of <byte>.  Used in various
 * places in the library when the FillOrder requires
 * bit reversal of byte values (e.g. CCITT Fax 3
 * encoding/decoding).  TIFFNoBitRevTable is provided
 * for algorithms that want an equivalent table that
 * do not reverse bit values.
 */
static const unsigned char TIFFBitRevTable[256] = {
    0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
    0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
    0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
    0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
    0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
    0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
    0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
    0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
    0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
    0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
    0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
    0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
    0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
    0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
    0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
    0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
    0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
    0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
    0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
    0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
    0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
    0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
    0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
    0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
    0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
    0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
    0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
    0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
    0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
    0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
    0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
    0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
};
static const unsigned char TIFFNoBitRevTable[256] = {
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 
    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 
    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 
    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 
    0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 
    0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 
    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 
    0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 
    0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 
    0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 
    0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 
    0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 
    0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 
    0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 
    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 
    0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 
    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 
    0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 
    0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 
    0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 
    0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 
    0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 
    0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 
    0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 
    0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 
    0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 
    0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 
    0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 
    0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 
    0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 
    0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 
    0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, 
};

const unsigned char*
TIFFGetBitRevTable(int reversed)
{
	return (reversed ? TIFFBitRevTable : TIFFNoBitRevTable);
}

void
TIFFReverseBits(uint8* cp, tmsize_t n)  
{
	for (; n > 8; n -= 8) {
		cp[0] = TIFFBitRevTable[cp[0]];
		cp[1] = TIFFBitRevTable[cp[1]];
		cp[2] = TIFFBitRevTable[cp[2]];
		cp[3] = TIFFBitRevTable[cp[3]];
		cp[4] = TIFFBitRevTable[cp[4]];
		cp[5] = TIFFBitRevTable[cp[5]];
		cp[6] = TIFFBitRevTable[cp[6]];
		cp[7] = TIFFBitRevTable[cp[7]];
		cp += 8;
	}
	while (n-- > 0)
		*cp = TIFFBitRevTable[*cp], cp++;
}

/* vim: set ts=8 sts=8 sw=8 noet: */
/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 8
 * fill-column: 78
 * End:
 */
Commit	Line	Data
8414a40c VZ	1
	2	/*
	3	* Copyright (c) 1988-1997 Sam Leffler
	4	* Copyright (c) 1991-1997 Silicon Graphics, Inc.
	5	*
	6	* Permission to use, copy, modify, distribute, and sell this software and
	7	* its documentation for any purpose is hereby granted without fee, provided
	8	* that (i) the above copyright notices and this permission notice appear in
	9	* all copies of the software and related documentation, and (ii) the names of
	10	* Sam Leffler and Silicon Graphics may not be used in any advertising or
	11	* publicity relating to the software without the specific, prior written
	12	* permission of Sam Leffler and Silicon Graphics.
	13	*
	14	* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
	15	* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
	16	* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
	17	*
	18	* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
	19	* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
	20	* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
	21	* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
	22	* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	23	* OF THIS SOFTWARE.
	24	*/
	25
	26	/*
	27	* TIFF Library Bit & Byte Swapping Support.
	28	*
	29	* XXX We assume short = 16-bits and long = 32-bits XXX
	30	*/
	31	#include "tiffiop.h"
	32
	33	#ifndef TIFFSwabShort
	34	void
	35	TIFFSwabShort(uint16* wp)
	36	{
	37	register unsigned char* cp = (unsigned char*) wp;
	38	unsigned char t;
80ed523f	39	assert(sizeof(uint16)==2);
8414a40c VZ	40	t = cp[1]; cp[1] = cp[0]; cp[0] = t;
	41	}
	42	#endif
	43
	44	#ifndef TIFFSwabLong
	45	void
	46	TIFFSwabLong(uint32* lp)
	47	{
	48	register unsigned char* cp = (unsigned char*) lp;
	49	unsigned char t;
80ed523f	50	assert(sizeof(uint32)==4);
8414a40c VZ	51	t = cp[3]; cp[3] = cp[0]; cp[0] = t;
	52	t = cp[2]; cp[2] = cp[1]; cp[1] = t;
	53	}
	54	#endif
	55
80ed523f VZ	56	#ifndef TIFFSwabLong8
	57	void
	58	TIFFSwabLong8(uint64* lp)
	59	{
	60	register unsigned char* cp = (unsigned char*) lp;
	61	unsigned char t;
	62	assert(sizeof(uint64)==8);
	63	t = cp[7]; cp[7] = cp[0]; cp[0] = t;
	64	t = cp[6]; cp[6] = cp[1]; cp[1] = t;
	65	t = cp[5]; cp[5] = cp[2]; cp[2] = t;
	66	t = cp[4]; cp[4] = cp[3]; cp[3] = t;
	67	}
	68	#endif
	69
8414a40c VZ	70	#ifndef TIFFSwabArrayOfShort
8414a40c VZ	71	void
80ed523f	72	TIFFSwabArrayOfShort(register uint16* wp, tmsize_t n)
8414a40c VZ	73	{
	74	register unsigned char* cp;
	75	register unsigned char t;
80ed523f	76	assert(sizeof(uint16)==2);
8414a40c VZ	77	/* XXX unroll loop some */
	78	while (n-- > 0) {
	79	cp = (unsigned char*) wp;
	80	t = cp[1]; cp[1] = cp[0]; cp[0] = t;
	81	wp++;
	82	}
	83	}
	84	#endif
	85
	86	#ifndef TIFFSwabArrayOfTriples
	87	void
80ed523f	88	TIFFSwabArrayOfTriples(register uint8* tp, tmsize_t n)
8414a40c VZ	89	{
	90	unsigned char* cp;
	91	unsigned char t;
	92
	93	/* XXX unroll loop some */
	94	while (n-- > 0) {
	95	cp = (unsigned char*) tp;
	96	t = cp[2]; cp[2] = cp[0]; cp[0] = t;
	97	tp += 3;
	98	}
	99	}
	100	#endif
	101
	102	#ifndef TIFFSwabArrayOfLong
	103	void
80ed523f	104	TIFFSwabArrayOfLong(register uint32* lp, tmsize_t n)
8414a40c VZ	105	{
	106	register unsigned char *cp;
	107	register unsigned char t;
80ed523f	108	assert(sizeof(uint32)==4);
8414a40c VZ	109	/* XXX unroll loop some */
	110	while (n-- > 0) {
	111	cp = (unsigned char *)lp;
	112	t = cp[3]; cp[3] = cp[0]; cp[0] = t;
	113	t = cp[2]; cp[2] = cp[1]; cp[1] = t;
	114	lp++;
	115	}
	116	}
	117	#endif
	118
80ed523f VZ	119	#ifndef TIFFSwabArrayOfLong8
	120	void
	121	TIFFSwabArrayOfLong8(register uint64* lp, tmsize_t n)
	122	{
	123	register unsigned char *cp;
	124	register unsigned char t;
	125	assert(sizeof(uint64)==8);
	126	/* XXX unroll loop some */
	127	while (n-- > 0) {
	128	cp = (unsigned char *)lp;
	129	t = cp[7]; cp[7] = cp[0]; cp[0] = t;
	130	t = cp[6]; cp[6] = cp[1]; cp[1] = t;
	131	t = cp[5]; cp[5] = cp[2]; cp[2] = t;
	132	t = cp[4]; cp[4] = cp[3]; cp[3] = t;
	133	lp++;
	134	}
	135	}
	136	#endif
	137
	138	#ifndef TIFFSwabFloat
	139	void
	140	TIFFSwabFloat(float* fp)
	141	{
	142	register unsigned char* cp = (unsigned char*) fp;
	143	unsigned char t;
	144	assert(sizeof(float)==4);
	145	t = cp[3]; cp[3] = cp[0]; cp[0] = t;
	146	t = cp[2]; cp[2] = cp[1]; cp[1] = t;
	147	}
	148	#endif
	149
	150	#ifndef TIFFSwabArrayOfFloat
	151	void
	152	TIFFSwabArrayOfFloat(register float* fp, tmsize_t n)
	153	{
	154	register unsigned char *cp;
	155	register unsigned char t;
	156	assert(sizeof(float)==4);
	157	/* XXX unroll loop some */
	158	while (n-- > 0) {
	159	cp = (unsigned char *)fp;
	160	t = cp[3]; cp[3] = cp[0]; cp[0] = t;
	161	t = cp[2]; cp[2] = cp[1]; cp[1] = t;
	162	fp++;
	163	}
	164	}
	165	#endif
	166
8414a40c VZ	167	#ifndef TIFFSwabDouble
	168	void
	169	TIFFSwabDouble(double *dp)
	170	{
80ed523f VZ	171	register unsigned char* cp = (unsigned char*) dp;
	172	unsigned char t;
	173	assert(sizeof(double)==8);
	174	t = cp[7]; cp[7] = cp[0]; cp[0] = t;
	175	t = cp[6]; cp[6] = cp[1]; cp[1] = t;
	176	t = cp[5]; cp[5] = cp[2]; cp[2] = t;
	177	t = cp[4]; cp[4] = cp[3]; cp[3] = t;
8414a40c VZ	178	}
	179	#endif
	180
	181	#ifndef TIFFSwabArrayOfDouble
	182	void
80ed523f	183	TIFFSwabArrayOfDouble(double* dp, tmsize_t n)
8414a40c	184	{
80ed523f VZ	185	register unsigned char *cp;
	186	register unsigned char t;
	187	assert(sizeof(double)==8);
	188	/* XXX unroll loop some */
	189	while (n-- > 0) {
	190	cp = (unsigned char *)dp;
	191	t = cp[7]; cp[7] = cp[0]; cp[0] = t;
	192	t = cp[6]; cp[6] = cp[1]; cp[1] = t;
	193	t = cp[5]; cp[5] = cp[2]; cp[2] = t;
	194	t = cp[4]; cp[4] = cp[3]; cp[3] = t;
	195	dp++;
	196	}
8414a40c VZ	197	}
	198	#endif
	199
	200	/*
	201	* Bit reversal tables. TIFFBitRevTable[<byte>] gives
	202	* the bit reversed value of <byte>. Used in various
	203	* places in the library when the FillOrder requires
	204	* bit reversal of byte values (e.g. CCITT Fax 3
	205	* encoding/decoding). TIFFNoBitRevTable is provided
	206	* for algorithms that want an equivalent table that
	207	* do not reverse bit values.
	208	*/
	209	static const unsigned char TIFFBitRevTable[256] = {
	210	0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
	211	0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
	212	0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
	213	0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
	214	0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
	215	0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
	216	0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
	217	0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
	218	0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
	219	0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
	220	0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
	221	0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
	222	0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
	223	0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
	224	0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
	225	0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
	226	0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
	227	0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
	228	0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
	229	0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
	230	0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
	231	0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
	232	0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
	233	0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
	234	0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
	235	0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
	236	0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
	237	0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
	238	0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
	239	0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
	240	0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
	241	0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
	242	};
	243	static const unsigned char TIFFNoBitRevTable[256] = {
	244	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
	245	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
	246	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
	247	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
	248	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
	249	0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
	250	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
	251	0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
	252	0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
	253	0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
	254	0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
	255	0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
	256	0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
	257	0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
	258	0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
	259	0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
	260	0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
261	0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
262	0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
263	0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
264	0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
265	0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
266	0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
267	0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
268	0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
269	0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
270	0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
271	0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
272	0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
273	0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
274	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
275	0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
276	};
277
278	const unsigned char*
279	TIFFGetBitRevTable(int reversed)
280	{
281	return (reversed ? TIFFBitRevTable : TIFFNoBitRevTable);
282	}
283
284	void
80ed523f	285	TIFFReverseBits(uint8* cp, tmsize_t n)
8414a40c VZ	286	{
	287	for (; n > 8; n -= 8) {
	288	cp[0] = TIFFBitRevTable[cp[0]];
	289	cp[1] = TIFFBitRevTable[cp[1]];
	290	cp[2] = TIFFBitRevTable[cp[2]];
	291	cp[3] = TIFFBitRevTable[cp[3]];
	292	cp[4] = TIFFBitRevTable[cp[4]];
	293	cp[5] = TIFFBitRevTable[cp[5]];
	294	cp[6] = TIFFBitRevTable[cp[6]];
	295	cp[7] = TIFFBitRevTable[cp[7]];
	296	cp += 8;
	297	}
	298	while (n-- > 0)
	299	cp = TIFFBitRevTable[cp], cp++;
	300	}
	301
	302	/* vim: set ts=8 sts=8 sw=8 noet: */
80ed523f VZ	303	/*
	304	* Local Variables:
	305	* mode: c
	306	* c-basic-offset: 8
	307	* fill-column: 78
	308	* End:
	309	*/