| 1 | /* $Id: tif_swab.c,v 1.4 2005/04/13 14:06:21 dron Exp $ */
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| 2 |
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| 3 | /*
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| 4 | * Copyright (c) 1988-1997 Sam Leffler
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| 5 | * Copyright (c) 1991-1997 Silicon Graphics, Inc.
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| 6 | *
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| 7 | * Permission to use, copy, modify, distribute, and sell this software and
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| 8 | * its documentation for any purpose is hereby granted without fee, provided
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| 9 | * that (i) the above copyright notices and this permission notice appear in
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| 10 | * all copies of the software and related documentation, and (ii) the names of
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| 11 | * Sam Leffler and Silicon Graphics may not be used in any advertising or
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| 12 | * publicity relating to the software without the specific, prior written
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| 13 | * permission of Sam Leffler and Silicon Graphics.
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| 14 | *
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| 15 | * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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| 16 | * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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| 17 | * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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| 18 | *
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| 19 | * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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| 20 | * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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| 21 | * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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| 22 | * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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| 23 | * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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| 24 | * OF THIS SOFTWARE.
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| 25 | */
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| 26 |
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| 27 | /*
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| 28 | * TIFF Library Bit & Byte Swapping Support.
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| 29 | *
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| 30 | * XXX We assume short = 16-bits and long = 32-bits XXX
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| 31 | */
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| 32 | #include "tiffiop.h"
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| 33 |
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| 34 | #ifndef TIFFSwabShort
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| 35 | void
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| 36 | TIFFSwabShort(uint16* wp)
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| 37 | {
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| 38 | register unsigned char* cp = (unsigned char*) wp;
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| 39 | unsigned char t;
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| 40 |
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| 41 | t = cp[1]; cp[1] = cp[0]; cp[0] = t;
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| 42 | }
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| 43 | #endif
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| 44 |
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| 45 | #ifndef TIFFSwabLong
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| 46 | void
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| 47 | TIFFSwabLong(uint32* lp)
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| 48 | {
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| 49 | register unsigned char* cp = (unsigned char*) lp;
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| 50 | unsigned char t;
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| 51 |
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| 52 | t = cp[3]; cp[3] = cp[0]; cp[0] = t;
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| 53 | t = cp[2]; cp[2] = cp[1]; cp[1] = t;
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| 54 | }
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| 55 | #endif
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| 56 |
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| 57 | #ifndef TIFFSwabArrayOfShort
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| 58 | void
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| 59 | TIFFSwabArrayOfShort(uint16* wp, register unsigned long n)
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| 60 | {
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| 61 | register unsigned char* cp;
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| 62 | register unsigned char t;
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| 63 |
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| 64 | /* XXX unroll loop some */
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| 65 | while (n-- > 0) {
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| 66 | cp = (unsigned char*) wp;
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| 67 | t = cp[1]; cp[1] = cp[0]; cp[0] = t;
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| 68 | wp++;
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| 69 | }
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| 70 | }
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| 71 | #endif
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| 72 |
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| 73 | #ifndef TIFFSwabArrayOfTriples
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| 74 | void
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| 75 | TIFFSwabArrayOfTriples(uint8* tp, unsigned long n)
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| 76 | {
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| 77 | unsigned char* cp;
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| 78 | unsigned char t;
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| 79 |
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| 80 | /* XXX unroll loop some */
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| 81 | while (n-- > 0) {
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| 82 | cp = (unsigned char*) tp;
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| 83 | t = cp[2]; cp[2] = cp[0]; cp[0] = t;
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| 84 | tp += 3;
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| 85 | }
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| 86 | }
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| 87 | #endif
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| 88 |
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| 89 | #ifndef TIFFSwabArrayOfLong
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| 90 | void
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| 91 | TIFFSwabArrayOfLong(register uint32* lp, register unsigned long n)
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| 92 | {
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| 93 | register unsigned char *cp;
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| 94 | register unsigned char t;
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| 95 |
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| 96 | /* XXX unroll loop some */
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| 97 | while (n-- > 0) {
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| 98 | cp = (unsigned char *)lp;
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| 99 | t = cp[3]; cp[3] = cp[0]; cp[0] = t;
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| 100 | t = cp[2]; cp[2] = cp[1]; cp[1] = t;
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| 101 | lp++;
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| 102 | }
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| 103 | }
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| 104 | #endif
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| 105 |
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| 106 | #ifndef TIFFSwabDouble
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| 107 | void
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| 108 | TIFFSwabDouble(double *dp)
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| 109 | {
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| 110 | register uint32* lp = (uint32*) dp;
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| 111 | uint32 t;
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| 112 |
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| 113 | TIFFSwabArrayOfLong(lp, 2);
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| 114 | t = lp[0]; lp[0] = lp[1]; lp[1] = t;
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| 115 | }
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| 116 | #endif
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| 117 |
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| 118 | #ifndef TIFFSwabArrayOfDouble
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| 119 | void
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| 120 | TIFFSwabArrayOfDouble(double* dp, register unsigned long n)
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| 121 | {
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| 122 | register uint32* lp = (uint32*) dp;
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| 123 | register uint32 t;
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| 124 |
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| 125 | TIFFSwabArrayOfLong(lp, n + n);
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| 126 | while (n-- > 0) {
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| 127 | t = lp[0]; lp[0] = lp[1]; lp[1] = t;
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| 128 | lp += 2;
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| 129 | }
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| 130 | }
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| 131 | #endif
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| 132 |
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| 133 | /*
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| 134 | * Bit reversal tables. TIFFBitRevTable[<byte>] gives
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| 135 | * the bit reversed value of <byte>. Used in various
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| 136 | * places in the library when the FillOrder requires
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| 137 | * bit reversal of byte values (e.g. CCITT Fax 3
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| 138 | * encoding/decoding). TIFFNoBitRevTable is provided
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| 139 | * for algorithms that want an equivalent table that
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| 140 | * do not reverse bit values.
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| 141 | */
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| 142 | static const unsigned char TIFFBitRevTable[256] = {
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| 143 | 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
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| 144 | 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
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| 145 | 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
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| 146 | 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
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| 147 | 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
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| 148 | 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
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| 149 | 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
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| 150 | 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
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| 151 | 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
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| 152 | 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
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| 153 | 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
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| 154 | 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
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| 155 | 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
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| 156 | 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
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| 157 | 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
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| 158 | 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
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| 159 | 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
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| 160 | 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
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| 161 | 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
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| 162 | 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
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| 163 | 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
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| 164 | 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
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| 165 | 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
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| 166 | 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
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| 167 | 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
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| 168 | 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
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| 169 | 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
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| 170 | 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
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| 171 | 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
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| 172 | 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
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| 173 | 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
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| 174 | 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
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| 175 | };
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| 176 | static const unsigned char TIFFNoBitRevTable[256] = {
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| 177 | 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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| 178 | 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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| 179 | 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
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| 180 | 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
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| 181 | 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
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| 182 | 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
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| 183 | 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
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| 184 | 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
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| 185 | 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
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| 186 | 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
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| 187 | 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
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| 188 | 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
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| 189 | 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
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| 190 | 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
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| 191 | 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
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| 192 | 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
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| 193 | 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
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| 194 | 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
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| 195 | 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
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| 196 | 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
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| 197 | 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
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| 198 | 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
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| 199 | 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
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| 200 | 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
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| 201 | 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
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| 202 | 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
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| 203 | 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
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| 204 | 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
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| 205 | 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
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| 206 | 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
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| 207 | 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
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| 208 | 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
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| 209 | };
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| 210 |
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| 211 | const unsigned char*
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| 212 | TIFFGetBitRevTable(int reversed)
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| 213 | {
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| 214 | return (reversed ? TIFFBitRevTable : TIFFNoBitRevTable);
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| 215 | }
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| 216 |
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| 217 | void
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| 218 | TIFFReverseBits(register unsigned char* cp, register unsigned long n)
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| 219 | {
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| 220 | for (; n > 8; n -= 8) {
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| 221 | cp[0] = TIFFBitRevTable[cp[0]];
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| 222 | cp[1] = TIFFBitRevTable[cp[1]];
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| 223 | cp[2] = TIFFBitRevTable[cp[2]];
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| 224 | cp[3] = TIFFBitRevTable[cp[3]];
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| 225 | cp[4] = TIFFBitRevTable[cp[4]];
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| 226 | cp[5] = TIFFBitRevTable[cp[5]];
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| 227 | cp[6] = TIFFBitRevTable[cp[6]];
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| 228 | cp[7] = TIFFBitRevTable[cp[7]];
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| 229 | cp += 8;
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| 230 | }
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| 231 | while (n-- > 0)
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| 232 | *cp = TIFFBitRevTable[*cp], cp++;
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| 233 | }
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| 234 |
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| 235 | /* vim: set ts=8 sts=8 sw=8 noet: */
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