Line data Source code
1 : /*
2 : * Copyright (c) 1988-1997 Sam Leffler
3 : * Copyright (c) 1991-1997 Silicon Graphics, Inc.
4 : *
5 : * Permission to use, copy, modify, distribute, and sell this software and
6 : * its documentation for any purpose is hereby granted without fee, provided
7 : * that (i) the above copyright notices and this permission notice appear in
8 : * all copies of the software and related documentation, and (ii) the names of
9 : * Sam Leffler and Silicon Graphics may not be used in any advertising or
10 : * publicity relating to the software without the specific, prior written
11 : * permission of Sam Leffler and Silicon Graphics.
12 : *
13 : * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
14 : * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
15 : * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
16 : *
17 : * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
18 : * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
19 : * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
20 : * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
21 : * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
22 : * OF THIS SOFTWARE.
23 : */
24 :
25 : /*
26 : * TIFF Library Bit & Byte Swapping Support.
27 : *
28 : * XXX We assume short = 16-bits and long = 32-bits XXX
29 : */
30 : #include "tiffiop.h"
31 :
32 : #if defined(DISABLE_CHECK_TIFFSWABMACROS) || !defined(TIFFSwabShort)
33 36924 : void TIFFSwabShort(uint16_t *wp)
34 : {
35 36924 : register unsigned char *cp = (unsigned char *)wp;
36 : unsigned char t;
37 : assert(sizeof(uint16_t) == 2);
38 36924 : t = cp[1];
39 36924 : cp[1] = cp[0];
40 36924 : cp[0] = t;
41 36924 : }
42 : #endif
43 :
44 : #if defined(DISABLE_CHECK_TIFFSWABMACROS) || !defined(TIFFSwabLong)
45 426431 : void TIFFSwabLong(uint32_t *lp)
46 : {
47 426431 : register unsigned char *cp = (unsigned char *)lp;
48 : unsigned char t;
49 : assert(sizeof(uint32_t) == 4);
50 426431 : t = cp[3];
51 426431 : cp[3] = cp[0];
52 426431 : cp[0] = t;
53 426431 : t = cp[2];
54 426431 : cp[2] = cp[1];
55 426431 : cp[1] = t;
56 426431 : }
57 : #endif
58 :
59 : #if defined(DISABLE_CHECK_TIFFSWABMACROS) || !defined(TIFFSwabLong8)
60 374 : void TIFFSwabLong8(uint64_t *lp)
61 : {
62 374 : register unsigned char *cp = (unsigned char *)lp;
63 : unsigned char t;
64 : assert(sizeof(uint64_t) == 8);
65 374 : t = cp[7];
66 374 : cp[7] = cp[0];
67 374 : cp[0] = t;
68 374 : t = cp[6];
69 374 : cp[6] = cp[1];
70 374 : cp[1] = t;
71 374 : t = cp[5];
72 374 : cp[5] = cp[2];
73 374 : cp[2] = t;
74 374 : t = cp[4];
75 374 : cp[4] = cp[3];
76 374 : cp[3] = t;
77 374 : }
78 : #endif
79 :
80 : #if defined(DISABLE_CHECK_TIFFSWABMACROS) || !defined(TIFFSwabArrayOfShort)
81 3974 : void TIFFSwabArrayOfShort(register uint16_t *wp, tmsize_t n)
82 : {
83 : register unsigned char *cp;
84 : register unsigned char t;
85 : assert(sizeof(uint16_t) == 2);
86 : /* XXX unroll loop some */
87 6203590 : while (n-- > 0)
88 : {
89 6199620 : cp = (unsigned char *)wp;
90 6199620 : t = cp[1];
91 6199620 : cp[1] = cp[0];
92 6199620 : cp[0] = t;
93 6199620 : wp++;
94 : }
95 3974 : }
96 : #endif
97 :
98 : #if defined(DISABLE_CHECK_TIFFSWABMACROS) || !defined(TIFFSwabArrayOfTriples)
99 0 : void TIFFSwabArrayOfTriples(register uint8_t *tp, tmsize_t n)
100 : {
101 : unsigned char *cp;
102 : unsigned char t;
103 :
104 : /* XXX unroll loop some */
105 0 : while (n-- > 0)
106 : {
107 0 : cp = (unsigned char *)tp;
108 0 : t = cp[2];
109 0 : cp[2] = cp[0];
110 0 : cp[0] = t;
111 0 : tp += 3;
112 : }
113 0 : }
114 : #endif
115 :
116 : #if defined(DISABLE_CHECK_TIFFSWABMACROS) || !defined(TIFFSwabArrayOfLong)
117 592 : void TIFFSwabArrayOfLong(register uint32_t *lp, tmsize_t n)
118 : {
119 : register unsigned char *cp;
120 : register unsigned char t;
121 : assert(sizeof(uint32_t) == 4);
122 : /* XXX unroll loop some */
123 881724 : while (n-- > 0)
124 : {
125 881132 : cp = (unsigned char *)lp;
126 881132 : t = cp[3];
127 881132 : cp[3] = cp[0];
128 881132 : cp[0] = t;
129 881132 : t = cp[2];
130 881132 : cp[2] = cp[1];
131 881132 : cp[1] = t;
132 881132 : lp++;
133 : }
134 592 : }
135 : #endif
136 :
137 : #if defined(DISABLE_CHECK_TIFFSWABMACROS) || !defined(TIFFSwabArrayOfLong8)
138 300 : void TIFFSwabArrayOfLong8(register uint64_t *lp, tmsize_t n)
139 : {
140 : register unsigned char *cp;
141 : register unsigned char t;
142 : assert(sizeof(uint64_t) == 8);
143 : /* XXX unroll loop some */
144 801526 : while (n-- > 0)
145 : {
146 801226 : cp = (unsigned char *)lp;
147 801226 : t = cp[7];
148 801226 : cp[7] = cp[0];
149 801226 : cp[0] = t;
150 801226 : t = cp[6];
151 801226 : cp[6] = cp[1];
152 801226 : cp[1] = t;
153 801226 : t = cp[5];
154 801226 : cp[5] = cp[2];
155 801226 : cp[2] = t;
156 801226 : t = cp[4];
157 801226 : cp[4] = cp[3];
158 801226 : cp[3] = t;
159 801226 : lp++;
160 : }
161 300 : }
162 : #endif
163 :
164 : #if defined(DISABLE_CHECK_TIFFSWABMACROS) || !defined(TIFFSwabFloat)
165 0 : void TIFFSwabFloat(float *fp)
166 : {
167 0 : register unsigned char *cp = (unsigned char *)fp;
168 : unsigned char t;
169 : assert(sizeof(float) == 4);
170 0 : t = cp[3];
171 0 : cp[3] = cp[0];
172 0 : cp[0] = t;
173 0 : t = cp[2];
174 0 : cp[2] = cp[1];
175 0 : cp[1] = t;
176 0 : }
177 : #endif
178 :
179 : #if defined(DISABLE_CHECK_TIFFSWABMACROS) || !defined(TIFFSwabArrayOfFloat)
180 0 : void TIFFSwabArrayOfFloat(register float *fp, tmsize_t n)
181 : {
182 : register unsigned char *cp;
183 : register unsigned char t;
184 : assert(sizeof(float) == 4);
185 : /* XXX unroll loop some */
186 0 : while (n-- > 0)
187 : {
188 0 : cp = (unsigned char *)fp;
189 0 : t = cp[3];
190 0 : cp[3] = cp[0];
191 0 : cp[0] = t;
192 0 : t = cp[2];
193 0 : cp[2] = cp[1];
194 0 : cp[1] = t;
195 0 : fp++;
196 : }
197 0 : }
198 : #endif
199 :
200 : #if defined(DISABLE_CHECK_TIFFSWABMACROS) || !defined(TIFFSwabDouble)
201 0 : void TIFFSwabDouble(double *dp)
202 : {
203 0 : register unsigned char *cp = (unsigned char *)dp;
204 : unsigned char t;
205 : assert(sizeof(double) == 8);
206 0 : t = cp[7];
207 0 : cp[7] = cp[0];
208 0 : cp[0] = t;
209 0 : t = cp[6];
210 0 : cp[6] = cp[1];
211 0 : cp[1] = t;
212 0 : t = cp[5];
213 0 : cp[5] = cp[2];
214 0 : cp[2] = t;
215 0 : t = cp[4];
216 0 : cp[4] = cp[3];
217 0 : cp[3] = t;
218 0 : }
219 : #endif
220 :
221 : #if defined(DISABLE_CHECK_TIFFSWABMACROS) || !defined(TIFFSwabArrayOfDouble)
222 46 : void TIFFSwabArrayOfDouble(double *dp, tmsize_t n)
223 : {
224 : register unsigned char *cp;
225 : register unsigned char t;
226 : assert(sizeof(double) == 8);
227 : /* XXX unroll loop some */
228 2625 : while (n-- > 0)
229 : {
230 2579 : cp = (unsigned char *)dp;
231 2579 : t = cp[7];
232 2579 : cp[7] = cp[0];
233 2579 : cp[0] = t;
234 2579 : t = cp[6];
235 2579 : cp[6] = cp[1];
236 2579 : cp[1] = t;
237 2579 : t = cp[5];
238 2579 : cp[5] = cp[2];
239 2579 : cp[2] = t;
240 2579 : t = cp[4];
241 2579 : cp[4] = cp[3];
242 2579 : cp[3] = t;
243 2579 : dp++;
244 : }
245 46 : }
246 : #endif
247 :
248 : /*
249 : * Bit reversal tables. TIFFBitRevTable[<byte>] gives
250 : * the bit reversed value of <byte>. Used in various
251 : * places in the library when the FillOrder requires
252 : * bit reversal of byte values (e.g. CCITT Fax 3
253 : * encoding/decoding). TIFFNoBitRevTable is provided
254 : * for algorithms that want an equivalent table that
255 : * do not reverse bit values.
256 : */
257 : static const unsigned char TIFFBitRevTable[256] = {
258 : 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0,
259 : 0x30, 0xb0, 0x70, 0xf0, 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
260 : 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, 0x04, 0x84, 0x44, 0xc4,
261 : 0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
262 : 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc,
263 : 0x3c, 0xbc, 0x7c, 0xfc, 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
264 : 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, 0x0a, 0x8a, 0x4a, 0xca,
265 : 0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
266 : 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6,
267 : 0x36, 0xb6, 0x76, 0xf6, 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
268 : 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, 0x01, 0x81, 0x41, 0xc1,
269 : 0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
270 : 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9,
271 : 0x39, 0xb9, 0x79, 0xf9, 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
272 : 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, 0x0d, 0x8d, 0x4d, 0xcd,
273 : 0x2d, 0xad, 0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
274 : 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3,
275 : 0x33, 0xb3, 0x73, 0xf3, 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
276 : 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, 0x07, 0x87, 0x47, 0xc7,
277 : 0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
278 : 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf,
279 : 0x3f, 0xbf, 0x7f, 0xff};
280 : static const unsigned char TIFFNoBitRevTable[256] = {
281 : 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
282 : 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
283 : 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
284 : 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
285 : 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
286 : 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
287 : 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53,
288 : 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
289 : 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b,
290 : 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
291 : 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83,
292 : 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
293 : 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
294 : 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
295 : 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3,
296 : 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
297 : 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb,
298 : 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
299 : 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3,
300 : 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
301 : 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb,
302 : 0xfc, 0xfd, 0xfe, 0xff,
303 : };
304 :
305 13 : const unsigned char *TIFFGetBitRevTable(int reversed)
306 : {
307 13 : return (reversed ? TIFFBitRevTable : TIFFNoBitRevTable);
308 : }
309 :
310 0 : void TIFFReverseBits(uint8_t *cp, tmsize_t n)
311 : {
312 0 : for (; n > 8; n -= 8)
313 : {
314 0 : cp[0] = TIFFBitRevTable[cp[0]];
315 0 : cp[1] = TIFFBitRevTable[cp[1]];
316 0 : cp[2] = TIFFBitRevTable[cp[2]];
317 0 : cp[3] = TIFFBitRevTable[cp[3]];
318 0 : cp[4] = TIFFBitRevTable[cp[4]];
319 0 : cp[5] = TIFFBitRevTable[cp[5]];
320 0 : cp[6] = TIFFBitRevTable[cp[6]];
321 0 : cp[7] = TIFFBitRevTable[cp[7]];
322 0 : cp += 8;
323 : }
324 0 : while (n-- > 0)
325 : {
326 0 : *cp = TIFFBitRevTable[*cp];
327 0 : cp++;
328 : }
329 0 : }
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