/* $Id: tif_swab.c,v 1.13 2010-03-10 18:56:49 bfriesen Exp $ */

/*

* 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:

*/