/src/FreeImage/Source/LibTIFF/tif_swab.c

https://bitbucket.org/cabalistic/ogredeps/ · C · 242 lines · 173 code · 20 blank · 49 comment · 6 complexity · be548b30223336d6d421e0582b1a0b30 MD5 · raw file

  1. /* $Id: tif_swab.c,v 1.37 2011/04/10 17:14:09 drolon Exp $ */
  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. * 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. #ifndef TIFFSwabShort
  32. void
  33. TIFFSwabShort(uint16* wp)
  34. {
  35. register unsigned char* cp = (unsigned char*) wp;
  36. unsigned char t;
  37. t = cp[1]; cp[1] = cp[0]; cp[0] = t;
  38. }
  39. #endif
  40. #ifndef TIFFSwabLong
  41. void
  42. TIFFSwabLong(uint32* lp)
  43. {
  44. register unsigned char* cp = (unsigned char*) lp;
  45. unsigned char t;
  46. t = cp[3]; cp[3] = cp[0]; cp[0] = t;
  47. t = cp[2]; cp[2] = cp[1]; cp[1] = t;
  48. }
  49. #endif
  50. #ifndef TIFFSwabArrayOfShort
  51. void
  52. TIFFSwabArrayOfShort(uint16* wp, register unsigned long n)
  53. {
  54. register unsigned char* cp;
  55. register unsigned char t;
  56. /* XXX unroll loop some */
  57. while (n-- > 0) {
  58. cp = (unsigned char*) wp;
  59. t = cp[1]; cp[1] = cp[0]; cp[0] = t;
  60. wp++;
  61. }
  62. }
  63. #endif
  64. #ifndef TIFFSwabArrayOfTriples
  65. void
  66. TIFFSwabArrayOfTriples(uint8* tp, unsigned long n)
  67. {
  68. unsigned char* cp;
  69. unsigned char t;
  70. /* XXX unroll loop some */
  71. while (n-- > 0) {
  72. cp = (unsigned char*) tp;
  73. t = cp[2]; cp[2] = cp[0]; cp[0] = t;
  74. tp += 3;
  75. }
  76. }
  77. #endif
  78. #ifndef TIFFSwabArrayOfLong
  79. void
  80. TIFFSwabArrayOfLong(register uint32* lp, register unsigned long n)
  81. {
  82. register unsigned char *cp;
  83. register unsigned char t;
  84. /* XXX unroll loop some */
  85. while (n-- > 0) {
  86. cp = (unsigned char *)lp;
  87. t = cp[3]; cp[3] = cp[0]; cp[0] = t;
  88. t = cp[2]; cp[2] = cp[1]; cp[1] = t;
  89. lp++;
  90. }
  91. }
  92. #endif
  93. #ifndef TIFFSwabDouble
  94. void
  95. TIFFSwabDouble(double *dp)
  96. {
  97. register uint32* lp = (uint32*) dp;
  98. uint32 t;
  99. TIFFSwabArrayOfLong(lp, 2);
  100. t = lp[0]; lp[0] = lp[1]; lp[1] = t;
  101. }
  102. #endif
  103. #ifndef TIFFSwabArrayOfDouble
  104. void
  105. TIFFSwabArrayOfDouble(double* dp, register unsigned long n)
  106. {
  107. register uint32* lp = (uint32*) dp;
  108. register uint32 t;
  109. TIFFSwabArrayOfLong(lp, n + n);
  110. while (n-- > 0) {
  111. t = lp[0]; lp[0] = lp[1]; lp[1] = t;
  112. lp += 2;
  113. }
  114. }
  115. #endif
  116. /*
  117. * Bit reversal tables. TIFFBitRevTable[<byte>] gives
  118. * the bit reversed value of <byte>. Used in various
  119. * places in the library when the FillOrder requires
  120. * bit reversal of byte values (e.g. CCITT Fax 3
  121. * encoding/decoding). TIFFNoBitRevTable is provided
  122. * for algorithms that want an equivalent table that
  123. * do not reverse bit values.
  124. */
  125. static const unsigned char TIFFBitRevTable[256] = {
  126. 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
  127. 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
  128. 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
  129. 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
  130. 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
  131. 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
  132. 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
  133. 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
  134. 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
  135. 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
  136. 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
  137. 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
  138. 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
  139. 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
  140. 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
  141. 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
  142. 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
  143. 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
  144. 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
  145. 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
  146. 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
  147. 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
  148. 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
  149. 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
  150. 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
  151. 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
  152. 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
  153. 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
  154. 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
  155. 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
  156. 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
  157. 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
  158. };
  159. static const unsigned char TIFFNoBitRevTable[256] = {
  160. 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
  161. 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
  162. 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
  163. 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
  164. 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
  165. 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
  166. 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
  167. 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
  168. 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
  169. 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
  170. 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
  171. 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
  172. 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
  173. 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
  174. 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
  175. 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
  176. 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
  177. 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
  178. 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
  179. 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
  180. 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
  181. 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
  182. 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
  183. 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
  184. 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
  185. 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
  186. 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
  187. 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
  188. 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
  189. 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
  190. 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
  191. 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
  192. };
  193. const unsigned char*
  194. TIFFGetBitRevTable(int reversed)
  195. {
  196. return (reversed ? TIFFBitRevTable : TIFFNoBitRevTable);
  197. }
  198. void
  199. TIFFReverseBits(register unsigned char* cp, register unsigned long n)
  200. {
  201. for (; n > 8; n -= 8) {
  202. cp[0] = TIFFBitRevTable[cp[0]];
  203. cp[1] = TIFFBitRevTable[cp[1]];
  204. cp[2] = TIFFBitRevTable[cp[2]];
  205. cp[3] = TIFFBitRevTable[cp[3]];
  206. cp[4] = TIFFBitRevTable[cp[4]];
  207. cp[5] = TIFFBitRevTable[cp[5]];
  208. cp[6] = TIFFBitRevTable[cp[6]];
  209. cp[7] = TIFFBitRevTable[cp[7]];
  210. cp += 8;
  211. }
  212. while (n-- > 0)
  213. *cp = TIFFBitRevTable[*cp], cp++;
  214. }
  215. /* vim: set ts=8 sts=8 sw=8 noet: */
  216. /*
  217. * Local Variables:
  218. * mode: c
  219. * c-basic-offset: 8
  220. * fill-column: 78
  221. * End:
  222. */