src/tiff/tiffio.h

   1 /* $Header$ */
   2
   3 /*
   4  * Copyright (c) 1988-1997 Sam Leffler
   5  * Copyright (c) 1991-1997 Silicon Graphics, Inc.
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and
   8  * its documentation for any purpose is hereby granted without fee, provided
   9  * that (i) the above copyright notices and this permission notice appear in
  10  * all copies of the software and related documentation, and (ii) the names of
  11  * Sam Leffler and Silicon Graphics may not be used in any advertising or
  12  * publicity relating to the software without the specific, prior written
  13  * permission of Sam Leffler and Silicon Graphics.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  17  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  18  *
  19  * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
  20  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  21  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  22  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  23  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  */
  26
  27 #ifndef _TIFFIO_
  28 #define _TIFFIO_
  29
  30 /*
  31  * TIFF I/O Library Definitions.
  32  */
  33 #include "tiff.h"
  34 #include "tiffvers.h"
  35
  36 /*
  37  * TIFF is defined as an incomplete type to hide the
  38  * library's internal data structures from clients.
  39  */
  40 typedef struct tiff TIFF;
  41
  42 /*
  43  * The following typedefs define the intrinsic size of
  44  * data types used in the *exported* interfaces.  These
  45  * definitions depend on the proper definition of types
  46  * in tiff.h.  Note also that the varargs interface used
  47  * to pass tag types and values uses the types defined in
  48  * tiff.h directly.
  49  *
  50  * NB: ttag_t is unsigned int and not unsigned short because
  51  *     ANSI C requires that the type before the ellipsis be a
  52  *     promoted type (i.e. one of int, unsigned int, pointer,
  53  *     or double) and because we defined pseudo-tags that are
  54  *     outside the range of legal Aldus-assigned tags.
  55  * NB: tsize_t is int32 and not uint32 because some functions
  56  *     return -1.
  57  * NB: toff_t is not off_t for many reasons; TIFFs max out at
  58  *     32-bit file offsets being the most important, and to ensure
  59  *     that it is unsigned, rather than signed.
  60  */
  61 typedef uint32 ttag_t;          /* directory tag */
  62 typedef uint16 tdir_t;          /* directory index */
  63 typedef uint16 tsample_t;       /* sample number */
  64 typedef uint32 tstrip_t;        /* strip number */
  65 typedef uint32 ttile_t;         /* tile number */
  66 typedef int32 tsize_t;          /* i/o size in bytes */
  67 typedef void* tdata_t;          /* image data ref */
  68 typedef uint32 toff_t;          /* file offset */
  69
  70 #if !defined(__WIN32__) && (defined(_WIN32) || defined(WIN32))
  71 #define __WIN32__
  72 #endif
  73
  74 /*
  75  * On windows you should define USE_WIN32_FILEIO if you are using tif_win32.c
  76  * or AVOID_WIN32_FILEIO if you are using something else (like tif_unix.c).
  77  *
  78  * By default tif_win32.c is assumed on windows if not using the cygwin
  79  * environment.
  80  */
  81
  82 #if defined(_WINDOWS) || defined(__WIN32__) || defined(_Windows)
  83 #  if !defined(__CYGWIN) && !defined(AVOID_WIN32_FILEIO) && !defined(USE_WIN32_FILIO)
  84 #    define USE_WIN32_FILEIO
  85 #  endif
  86 #endif
  87
  88 #if defined(USE_WIN32_FILEIO)
  89 #include <windows.h>
  90 #ifdef __WIN32__
  91 DECLARE_HANDLE(thandle_t);      /* Win32 file handle */
  92 #else
  93 typedef HFILE thandle_t;        /* client data handle */
  94 #endif
  95 #else
  96 typedef void* thandle_t;        /* client data handle */
  97 #endif
  98
  99 #ifndef NULL
 100 #define NULL    0
 101 #endif
 102
 103 /*
 104  * Flags to pass to TIFFPrintDirectory to control
 105  * printing of data structures that are potentially
 106  * very large.   Bit-or these flags to enable printing
 107  * multiple items.
 108  */
 109 #define TIFFPRINT_NONE          0x0             /* no extra info */
 110 #define TIFFPRINT_STRIPS        0x1             /* strips/tiles info */
 111 #define TIFFPRINT_CURVES        0x2             /* color/gray response curves */
 112 #define TIFFPRINT_COLORMAP      0x4             /* colormap */
 113 #define TIFFPRINT_JPEGQTABLES   0x100           /* JPEG Q matrices */
 114 #define TIFFPRINT_JPEGACTABLES  0x200           /* JPEG AC tables */
 115 #define TIFFPRINT_JPEGDCTABLES  0x200           /* JPEG DC tables */
 116
 117 /*
 118  * Colour conversion stuff
 119  */
 120
 121 /* reference white */
 122 #define D65_X0 (95.0470F)
 123 #define D65_Y0 (100.0F)
 124 #define D65_Z0 (108.8827F)
 125
 126 #define D50_X0 (96.4250F)
 127 #define D50_Y0 (100.0F)
 128 #define D50_Z0 (82.4680F)
 129
 130 /* Structure for holding information about a display device. */
 131
 132 typedef unsigned char TIFFRGBValue;             /* 8-bit samples */
 133
 134 typedef struct {
 135         float d_mat[3][3];              /* XYZ -> luminance matrix */
 136         float d_YCR;                    /* Light o/p for reference white */
 137         float d_YCG;
 138         float d_YCB;
 139         uint32 d_Vrwr;                  /* Pixel values for ref. white */
 140         uint32 d_Vrwg;
 141         uint32 d_Vrwb;
 142         float d_Y0R;                    /* Residual light for black pixel */
 143         float d_Y0G;
 144         float d_Y0B;
 145         float d_gammaR;                 /* Gamma values for the three guns */
 146         float d_gammaG;
 147         float d_gammaB;
 148 } TIFFDisplay;
 149
 150 typedef struct {                                /* YCbCr->RGB support */
 151         TIFFRGBValue* clamptab;                 /* range clamping table */
 152         int*    Cr_r_tab;
 153         int*    Cb_b_tab;
 154         int32*  Cr_g_tab;
 155         int32*  Cb_g_tab;
 156         int32*  Y_tab;
 157 } TIFFYCbCrToRGB;
 158
 159 typedef struct {                                /* CIE Lab 1976->RGB support */
 160         int     range;                          /* Size of conversion table */
 161 #define CIELABTORGB_TABLE_RANGE 1500
 162         float   rstep, gstep, bstep;
 163         float   X0, Y0, Z0;                     /* Reference white point */
 164         TIFFDisplay display;
 165         float   Yr2r[CIELABTORGB_TABLE_RANGE + 1];  /* Conversion of Yr to r */
 166         float   Yg2g[CIELABTORGB_TABLE_RANGE + 1];  /* Conversion of Yg to g */
 167         float   Yb2b[CIELABTORGB_TABLE_RANGE + 1];  /* Conversion of Yb to b */
 168 } TIFFCIELabToRGB;
 169
 170 extern int TIFFCIELabToRGBInit(TIFFCIELabToRGB*, TIFFDisplay *, float*);
 171 extern void TIFFCIELabToXYZ(TIFFCIELabToRGB *, uint32, int32, int32,
 172                             float *, float *, float *);
 173 extern void TIFFXYZToRGB(TIFFCIELabToRGB *, float, float, float,
 174                          uint32 *, uint32 *, uint32 *);
 175
 176 extern int TIFFYCbCrToRGBInit(TIFFYCbCrToRGB*, float*, float*);
 177 extern void TIFFYCbCrtoRGB(TIFFYCbCrToRGB *, uint32, int32, int32,
 178                            uint32 *, uint32 *, uint32 *);
 179
 180 /*
 181  * RGBA-style image support.
 182  */
 183 typedef struct _TIFFRGBAImage TIFFRGBAImage;
 184 /*
 185  * The image reading and conversion routines invoke
 186  * ``put routines'' to copy/image/whatever tiles of
 187  * raw image data.  A default set of routines are
 188  * provided to convert/copy raw image data to 8-bit
 189  * packed ABGR format rasters.  Applications can supply
 190  * alternate routines that unpack the data into a
 191  * different format or, for example, unpack the data
 192  * and draw the unpacked raster on the display.
 193  */
 194 typedef void (*tileContigRoutine)
 195     (TIFFRGBAImage*, uint32*, uint32, uint32, uint32, uint32, int32, int32,
 196         unsigned char*);
 197 typedef void (*tileSeparateRoutine)
 198     (TIFFRGBAImage*, uint32*, uint32, uint32, uint32, uint32, int32, int32,
 199         unsigned char*, unsigned char*, unsigned char*, unsigned char*);
 200 /*
 201  * RGBA-reader state.
 202  */
 203 struct _TIFFRGBAImage {
 204         TIFF*   tif;                            /* image handle */
 205         int     stoponerr;                      /* stop on read error */
 206         int     isContig;                       /* data is packed/separate */
 207         int     alpha;                          /* type of alpha data present */
 208         uint32  width;                          /* image width */
 209         uint32  height;                         /* image height */
 210         uint16  bitspersample;                  /* image bits/sample */
 211         uint16  samplesperpixel;                /* image samples/pixel */
 212         uint16  orientation;                    /* image orientation */
 213         uint16  req_orientation;                /* requested orientation */
 214         uint16  photometric;                    /* image photometric interp */
 215         uint16* redcmap;                        /* colormap pallete */
 216         uint16* greencmap;
 217         uint16* bluecmap;
 218                                                 /* get image data routine */
 219         int     (*get)(TIFFRGBAImage*, uint32*, uint32, uint32);
 220         union {
 221             void (*any)(TIFFRGBAImage*);
 222             tileContigRoutine   contig;
 223             tileSeparateRoutine separate;
 224         } put;                                  /* put decoded strip/tile */
 225         TIFFRGBValue* Map;                      /* sample mapping array */
 226         uint32** BWmap;                         /* black&white map */
 227         uint32** PALmap;                        /* palette image map */
 228         TIFFYCbCrToRGB* ycbcr;                  /* YCbCr conversion state */
 229         TIFFCIELabToRGB* cielab;                /* CIE L*a*b conversion state */
 230
 231         int     row_offset;
 232         int     col_offset;
 233 };
 234
 235 /*
 236  * Macros for extracting components from the
 237  * packed ABGR form returned by TIFFReadRGBAImage.
 238  */
 239 #define TIFFGetR(abgr)  ((abgr) & 0xff)
 240 #define TIFFGetG(abgr)  (((abgr) >> 8) & 0xff)
 241 #define TIFFGetB(abgr)  (((abgr) >> 16) & 0xff)
 242 #define TIFFGetA(abgr)  (((abgr) >> 24) & 0xff)
 243
 244 /*
 245  * A CODEC is a software package that implements decoding,
 246  * encoding, or decoding+encoding of a compression algorithm.
 247  * The library provides a collection of builtin codecs.
 248  * More codecs may be registered through calls to the library
 249  * and/or the builtin implementations may be overridden.
 250  */
 251 typedef int (*TIFFInitMethod)(TIFF*, int);
 252 typedef struct {
 253         char*           name;
 254         uint16          scheme;
 255         TIFFInitMethod  init;
 256 } TIFFCodec;
 257
 258 #include <stdio.h>
 259 #include <stdarg.h>
 260
 261 /* share internal LogLuv conversion routines? */
 262 #ifndef LOGLUV_PUBLIC
 263 #define LOGLUV_PUBLIC           1
 264 #endif
 265
 266 #if defined(__cplusplus)
 267 extern "C" {
 268 #endif
 269 typedef void (*TIFFErrorHandler)(const char*, const char*, va_list);
 270 typedef tsize_t (*TIFFReadWriteProc)(thandle_t, tdata_t, tsize_t);
 271 typedef toff_t (*TIFFSeekProc)(thandle_t, toff_t, int);
 272 typedef int (*TIFFCloseProc)(thandle_t);
 273 typedef toff_t (*TIFFSizeProc)(thandle_t);
 274 typedef int (*TIFFMapFileProc)(thandle_t, tdata_t*, toff_t*);
 275 typedef void (*TIFFUnmapFileProc)(thandle_t, tdata_t, toff_t);
 276 typedef void (*TIFFExtendProc)(TIFF*);
 277
 278 extern  const char* TIFFGetVersion(void);
 279
 280 extern  const TIFFCodec* TIFFFindCODEC(uint16);
 281 extern  TIFFCodec* TIFFRegisterCODEC(uint16, const char*, TIFFInitMethod);
 282 extern  void TIFFUnRegisterCODEC(TIFFCodec*);
 283 extern  int TIFFIsCODECConfigured(uint16);
 284
 285 extern  tdata_t _TIFFmalloc(tsize_t);
 286 extern  tdata_t _TIFFrealloc(tdata_t, tsize_t);
 287 extern  void _TIFFmemset(tdata_t, int, tsize_t);
 288 extern  void _TIFFmemcpy(tdata_t, const tdata_t, tsize_t);
 289 extern  int _TIFFmemcmp(const tdata_t, const tdata_t, tsize_t);
 290 extern  void _TIFFfree(tdata_t);
 291
 292 extern  void TIFFClose(TIFF*);
 293 extern  int TIFFFlush(TIFF*);
 294 extern  int TIFFFlushData(TIFF*);
 295 extern  int TIFFGetField(TIFF*, ttag_t, ...);
 296 extern  int TIFFVGetField(TIFF*, ttag_t, va_list);
 297 extern  int TIFFGetFieldDefaulted(TIFF*, ttag_t, ...);
 298 extern  int TIFFVGetFieldDefaulted(TIFF*, ttag_t, va_list);
 299 extern  int TIFFReadDirectory(TIFF*);
 300 extern  tsize_t TIFFScanlineSize(TIFF*);
 301 extern  tsize_t TIFFRasterScanlineSize(TIFF*);
 302 extern  tsize_t TIFFStripSize(TIFF*);
 303 extern  tsize_t TIFFRawStripSize(TIFF*, tstrip_t);
 304 extern  tsize_t TIFFVStripSize(TIFF*, uint32);
 305 extern  tsize_t TIFFTileRowSize(TIFF*);
 306 extern  tsize_t TIFFTileSize(TIFF*);
 307 extern  tsize_t TIFFVTileSize(TIFF*, uint32);
 308 extern  uint32 TIFFDefaultStripSize(TIFF*, uint32);
 309 extern  void TIFFDefaultTileSize(TIFF*, uint32*, uint32*);
 310 extern  int TIFFFileno(TIFF*);
 311 extern  int TIFFGetMode(TIFF*);
 312 extern  int TIFFIsTiled(TIFF*);
 313 extern  int TIFFIsByteSwapped(TIFF*);
 314 extern  int TIFFIsUpSampled(TIFF*);
 315 extern  int TIFFIsMSB2LSB(TIFF*);
 316 extern  uint32 TIFFCurrentRow(TIFF*);
 317 extern  tdir_t TIFFCurrentDirectory(TIFF*);
 318 extern  tdir_t TIFFNumberOfDirectories(TIFF*);
 319 extern  uint32 TIFFCurrentDirOffset(TIFF*);
 320 extern  tstrip_t TIFFCurrentStrip(TIFF*);
 321 extern  ttile_t TIFFCurrentTile(TIFF*);
 322 extern  int TIFFReadBufferSetup(TIFF*, tdata_t, tsize_t);
 323 extern  int TIFFWriteBufferSetup(TIFF*, tdata_t, tsize_t);
 324 extern  int TIFFSetupStrips(TIFF *);
 325 extern  int TIFFWriteCheck(TIFF*, int, const char *);
 326 extern  int TIFFCreateDirectory(TIFF*);
 327 extern  int TIFFLastDirectory(TIFF*);
 328 extern  int TIFFSetDirectory(TIFF*, tdir_t);
 329 extern  int TIFFSetSubDirectory(TIFF*, uint32);
 330 extern  int TIFFUnlinkDirectory(TIFF*, tdir_t);
 331 extern  int TIFFSetField(TIFF*, ttag_t, ...);
 332 extern  int TIFFVSetField(TIFF*, ttag_t, va_list);
 333 extern  int TIFFWriteDirectory(TIFF *);
 334 extern  int TIFFCheckpointDirectory(TIFF *);
 335 extern  int TIFFRewriteDirectory(TIFF *);
 336 extern  int TIFFReassignTagToIgnore(enum TIFFIgnoreSense, int);
 337
 338 #if defined(c_plusplus) || defined(__cplusplus)
 339 extern  void TIFFPrintDirectory(TIFF*, FILE*, long = 0);
 340 extern  int TIFFReadScanline(TIFF*, tdata_t, uint32, tsample_t = 0);
 341 extern  int TIFFWriteScanline(TIFF*, tdata_t, uint32, tsample_t = 0);
 342 extern  int TIFFReadRGBAImage(TIFF*, uint32, uint32, uint32*, int = 0);
 343 extern  int TIFFReadRGBAImageOriented(TIFF*, uint32, uint32, uint32*,
 344                                       int = ORIENTATION_BOTLEFT, int = 0);
 345 #else
 346 extern  void TIFFPrintDirectory(TIFF*, FILE*, long);
 347 extern  int TIFFReadScanline(TIFF*, tdata_t, uint32, tsample_t);
 348 extern  int TIFFWriteScanline(TIFF*, tdata_t, uint32, tsample_t);
 349 extern  int TIFFReadRGBAImage(TIFF*, uint32, uint32, uint32*, int);
 350 extern  int TIFFReadRGBAImageOriented(TIFF*, uint32, uint32, uint32*, int, int);
 351 #endif
 352
 353 extern  int TIFFReadRGBAStrip(TIFF*, tstrip_t, uint32 * );
 354 extern  int TIFFReadRGBATile(TIFF*, uint32, uint32, uint32 * );
 355 extern  int TIFFRGBAImageOK(TIFF*, char [1024]);
 356 extern  int TIFFRGBAImageBegin(TIFFRGBAImage*, TIFF*, int, char [1024]);
 357 extern  int TIFFRGBAImageGet(TIFFRGBAImage*, uint32*, uint32, uint32);
 358 extern  void TIFFRGBAImageEnd(TIFFRGBAImage*);
 359 extern  TIFF* TIFFOpen(const char*, const char*);
 360 extern  TIFF* TIFFFdOpen(int, const char*, const char*);
 361 extern  TIFF* TIFFClientOpen(const char*, const char*,
 362             thandle_t,
 363             TIFFReadWriteProc, TIFFReadWriteProc,
 364             TIFFSeekProc, TIFFCloseProc,
 365             TIFFSizeProc,
 366             TIFFMapFileProc, TIFFUnmapFileProc);
 367 extern  const char* TIFFFileName(TIFF*);
 368 extern  void TIFFError(const char*, const char*, ...);
 369 extern  void TIFFWarning(const char*, const char*, ...);
 370 extern  TIFFErrorHandler TIFFSetErrorHandler(TIFFErrorHandler);
 371 extern  TIFFErrorHandler TIFFSetWarningHandler(TIFFErrorHandler);
 372 extern  TIFFExtendProc TIFFSetTagExtender(TIFFExtendProc);
 373 extern  ttile_t TIFFComputeTile(TIFF*, uint32, uint32, uint32, tsample_t);
 374 extern  int TIFFCheckTile(TIFF*, uint32, uint32, uint32, tsample_t);
 375 extern  ttile_t TIFFNumberOfTiles(TIFF*);
 376 extern  tsize_t TIFFReadTile(TIFF*,
 377             tdata_t, uint32, uint32, uint32, tsample_t);
 378 extern  tsize_t TIFFWriteTile(TIFF*,
 379             tdata_t, uint32, uint32, uint32, tsample_t);
 380 extern  tstrip_t TIFFComputeStrip(TIFF*, uint32, tsample_t);
 381 extern  tstrip_t TIFFNumberOfStrips(TIFF*);
 382 extern  tsize_t TIFFReadEncodedStrip(TIFF*, tstrip_t, tdata_t, tsize_t);
 383 extern  tsize_t TIFFReadRawStrip(TIFF*, tstrip_t, tdata_t, tsize_t);
 384 extern  tsize_t TIFFReadEncodedTile(TIFF*, ttile_t, tdata_t, tsize_t);
 385 extern  tsize_t TIFFReadRawTile(TIFF*, ttile_t, tdata_t, tsize_t);
 386 extern  tsize_t TIFFWriteEncodedStrip(TIFF*, tstrip_t, tdata_t, tsize_t);
 387 extern  tsize_t TIFFWriteRawStrip(TIFF*, tstrip_t, tdata_t, tsize_t);
 388 extern  tsize_t TIFFWriteEncodedTile(TIFF*, ttile_t, tdata_t, tsize_t);
 389 extern  tsize_t TIFFWriteRawTile(TIFF*, ttile_t, tdata_t, tsize_t);
 390 extern  int TIFFDataWidth(TIFFDataType);    /* table of tag datatype widths */
 391 extern  void TIFFSetWriteOffset(TIFF*, toff_t);
 392 extern  void TIFFSwabShort(uint16*);
 393 extern  void TIFFSwabLong(uint32*);
 394 extern  void TIFFSwabDouble(double*);
 395 extern  void TIFFSwabArrayOfShort(uint16*, unsigned long);
 396 extern  void TIFFSwabArrayOfLong(uint32*, unsigned long);
 397 extern  void TIFFSwabArrayOfDouble(double*, unsigned long);
 398 extern  void TIFFReverseBits(unsigned char *, unsigned long);
 399 extern  const unsigned char* TIFFGetBitRevTable(int);
 400
 401 #ifdef LOGLUV_PUBLIC
 402 #define U_NEU           0.210526316
 403 #define V_NEU           0.473684211
 404 #define UVSCALE         410.
 405 extern  double LogL16toY(int);
 406 extern  double LogL10toY(int);
 407 extern  void XYZtoRGB24(float*, uint8*);
 408 extern  int uv_decode(double*, double*, int);
 409 extern  void LogLuv24toXYZ(uint32, float*);
 410 extern  void LogLuv32toXYZ(uint32, float*);
 411 #if defined(c_plusplus) || defined(__cplusplus)
 412 extern  int LogL16fromY(double, int = SGILOGENCODE_NODITHER);
 413 extern  int LogL10fromY(double, int = SGILOGENCODE_NODITHER);
 414 extern  int uv_encode(double, double, int = SGILOGENCODE_NODITHER);
 415 extern  uint32 LogLuv24fromXYZ(float*, int = SGILOGENCODE_NODITHER);
 416 extern  uint32 LogLuv32fromXYZ(float*, int = SGILOGENCODE_NODITHER);
 417 #else
 418 extern  int LogL16fromY(double, int);
 419 extern  int LogL10fromY(double, int);
 420 extern  int uv_encode(double, double, int);
 421 extern  uint32 LogLuv24fromXYZ(float*, int);
 422 extern  uint32 LogLuv32fromXYZ(float*, int);
 423 #endif
 424 #endif /* LOGLUV_PUBLIC */
 425
 426 /*
 427 ** New stuff going public in 3.6.x.
 428 */
 429 extern  int  TIFFGetTagListCount( TIFF * );
 430 extern  ttag_t TIFFGetTagListEntry( TIFF *, int tag_index );
 431
 432 #define TIFF_ANY        TIFF_NOTYPE     /* for field descriptor searching */
 433 #define TIFF_VARIABLE   -1              /* marker for variable length tags */
 434 #define TIFF_SPP        -2              /* marker for SamplesPerPixel tags */
 435 #define TIFF_VARIABLE2  -3              /* marker for uint32 var-length tags */
 436
 437 #define FIELD_CUSTOM    65
 438
 439 typedef struct {
 440         ttag_t  field_tag;              /* field's tag */
 441         short   field_readcount;        /* read count/TIFF_VARIABLE/TIFF_SPP */
 442         short   field_writecount;       /* write count/TIFF_VARIABLE */
 443         TIFFDataType field_type;        /* type of associated data */
 444         unsigned short field_bit;       /* bit in fieldsset bit vector */
 445         unsigned char field_oktochange; /* if true, can change while writing */
 446         unsigned char field_passcount;  /* if true, pass dir count on set */
 447         char    *field_name;            /* ASCII name */
 448 } TIFFFieldInfo;
 449
 450 typedef struct _TIFFTagValue {
 451     const TIFFFieldInfo  *info;
 452     int             count;
 453     void           *value;
 454 } TIFFTagValue;
 455
 456 extern  void TIFFMergeFieldInfo(TIFF*, const TIFFFieldInfo[], int);
 457 extern  const TIFFFieldInfo* TIFFFindFieldInfo(TIFF*, ttag_t, TIFFDataType);
 458 extern  const TIFFFieldInfo* TIFFFieldWithTag(TIFF*, ttag_t);
 459
 460 typedef int (*TIFFVSetMethod)(TIFF*, ttag_t, va_list);
 461 typedef int (*TIFFVGetMethod)(TIFF*, ttag_t, va_list);
 462 typedef void (*TIFFPrintMethod)(TIFF*, FILE*, long);
 463
 464 typedef struct {
 465     TIFFVSetMethod      vsetfield;      /* tag set routine */
 466     TIFFVGetMethod      vgetfield;      /* tag get routine */
 467     TIFFPrintMethod     printdir;       /* directory print routine */
 468 } TIFFTagMethods;
 469
 470 extern  TIFFTagMethods *TIFFAccessTagMethods( TIFF * );
 471 extern  void *TIFFGetClientInfo( TIFF *, const char * );
 472 extern  void TIFFSetClientInfo( TIFF *, void *, const char * );
 473
 474 #if defined(__cplusplus)
 475 }
 476 #endif
 477 #endif /* _TIFFIO_ */