1 /***************************************************************************/ 2 /* */ 3 /* ftstream.h */ 4 /* */ 5 /* Stream handling (specification). */ 6 /* */ 7 /* Copyright 1996-2018 by */ 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9 /* */ 10 /* This file is part of the FreeType project, and may only be used, */ 11 /* modified, and distributed under the terms of the FreeType project */ 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13 /* this file you indicate that you have read the license and */ 14 /* understand and accept it fully. */ 15 /* */ 16 /***************************************************************************/ 17 18 19 #ifndef FTSTREAM_H_ 20 #define FTSTREAM_H_ 21 22 23 #include <ft2build.h> 24 #include FT_SYSTEM_H 25 #include FT_INTERNAL_OBJECTS_H 26 27 28 FT_BEGIN_HEADER 29 30 31 /* format of an 8-bit frame_op value: */ 32 /* */ 33 /* bit 76543210 */ 34 /* xxxxxxes */ 35 /* */ 36 /* s is set to 1 if the value is signed. */ 37 /* e is set to 1 if the value is little-endian. */ 38 /* xxx is a command. */ 39 40 #define FT_FRAME_OP_SHIFT 2 41 #define FT_FRAME_OP_SIGNED 1 42 #define FT_FRAME_OP_LITTLE 2 43 #define FT_FRAME_OP_COMMAND( x ) ( x >> FT_FRAME_OP_SHIFT ) 44 45 #define FT_MAKE_FRAME_OP( command, little, sign ) \ 46 ( ( command << FT_FRAME_OP_SHIFT ) | ( little << 1 ) | sign ) 47 48 #define FT_FRAME_OP_END 0 49 #define FT_FRAME_OP_START 1 /* start a new frame */ 50 #define FT_FRAME_OP_BYTE 2 /* read 1-byte value */ 51 #define FT_FRAME_OP_SHORT 3 /* read 2-byte value */ 52 #define FT_FRAME_OP_LONG 4 /* read 4-byte value */ 53 #define FT_FRAME_OP_OFF3 5 /* read 3-byte value */ 54 #define FT_FRAME_OP_BYTES 6 /* read a bytes sequence */ 55 56 57 typedef enum FT_Frame_Op_ 58 { 59 ft_frame_end = 0, 60 ft_frame_start = FT_MAKE_FRAME_OP( FT_FRAME_OP_START, 0, 0 ), 61 62 ft_frame_byte = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTE, 0, 0 ), 63 ft_frame_schar = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTE, 0, 1 ), 64 65 ft_frame_ushort_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 0, 0 ), 66 ft_frame_short_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 0, 1 ), 67 ft_frame_ushort_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 1, 0 ), 68 ft_frame_short_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_SHORT, 1, 1 ), 69 70 ft_frame_ulong_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 0, 0 ), 71 ft_frame_long_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 0, 1 ), 72 ft_frame_ulong_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 1, 0 ), 73 ft_frame_long_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_LONG, 1, 1 ), 74 75 ft_frame_uoff3_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 0, 0 ), 76 ft_frame_off3_be = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 0, 1 ), 77 ft_frame_uoff3_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 1, 0 ), 78 ft_frame_off3_le = FT_MAKE_FRAME_OP( FT_FRAME_OP_OFF3, 1, 1 ), 79 80 ft_frame_bytes = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTES, 0, 0 ), 81 ft_frame_skip = FT_MAKE_FRAME_OP( FT_FRAME_OP_BYTES, 0, 1 ) 82 83 } FT_Frame_Op; 84 85 86 typedef struct FT_Frame_Field_ 87 { 88 FT_Byte value; 89 FT_Byte size; 90 FT_UShort offset; 91 92 } FT_Frame_Field; 93 94 95 /* Construct an FT_Frame_Field out of a structure type and a field name. */ 96 /* The structure type must be set in the FT_STRUCTURE macro before */ 97 /* calling the FT_FRAME_START() macro. */ 98 /* */ 99 #define FT_FIELD_SIZE( f ) \ 100 (FT_Byte)sizeof ( ((FT_STRUCTURE*)0)->f ) 101 102 #define FT_FIELD_SIZE_DELTA( f ) \ 103 (FT_Byte)sizeof ( ((FT_STRUCTURE*)0)->f[0] ) 104 105 #define FT_FIELD_OFFSET( f ) \ 106 (FT_UShort)( offsetof( FT_STRUCTURE, f ) ) 107 108 #define FT_FRAME_FIELD( frame_op, field ) \ 109 { \ 110 frame_op, \ 111 FT_FIELD_SIZE( field ), \ 112 FT_FIELD_OFFSET( field ) \ 113 } 114 115 #define FT_MAKE_EMPTY_FIELD( frame_op ) { frame_op, 0, 0 } 116 117 #define FT_FRAME_START( size ) { ft_frame_start, 0, size } 118 #define FT_FRAME_END { ft_frame_end, 0, 0 } 119 120 #define FT_FRAME_LONG( f ) FT_FRAME_FIELD( ft_frame_long_be, f ) 121 #define FT_FRAME_ULONG( f ) FT_FRAME_FIELD( ft_frame_ulong_be, f ) 122 #define FT_FRAME_SHORT( f ) FT_FRAME_FIELD( ft_frame_short_be, f ) 123 #define FT_FRAME_USHORT( f ) FT_FRAME_FIELD( ft_frame_ushort_be, f ) 124 #define FT_FRAME_OFF3( f ) FT_FRAME_FIELD( ft_frame_off3_be, f ) 125 #define FT_FRAME_UOFF3( f ) FT_FRAME_FIELD( ft_frame_uoff3_be, f ) 126 #define FT_FRAME_BYTE( f ) FT_FRAME_FIELD( ft_frame_byte, f ) 127 #define FT_FRAME_CHAR( f ) FT_FRAME_FIELD( ft_frame_schar, f ) 128 129 #define FT_FRAME_LONG_LE( f ) FT_FRAME_FIELD( ft_frame_long_le, f ) 130 #define FT_FRAME_ULONG_LE( f ) FT_FRAME_FIELD( ft_frame_ulong_le, f ) 131 #define FT_FRAME_SHORT_LE( f ) FT_FRAME_FIELD( ft_frame_short_le, f ) 132 #define FT_FRAME_USHORT_LE( f ) FT_FRAME_FIELD( ft_frame_ushort_le, f ) 133 #define FT_FRAME_OFF3_LE( f ) FT_FRAME_FIELD( ft_frame_off3_le, f ) 134 #define FT_FRAME_UOFF3_LE( f ) FT_FRAME_FIELD( ft_frame_uoff3_le, f ) 135 136 #define FT_FRAME_SKIP_LONG { ft_frame_long_be, 0, 0 } 137 #define FT_FRAME_SKIP_SHORT { ft_frame_short_be, 0, 0 } 138 #define FT_FRAME_SKIP_BYTE { ft_frame_byte, 0, 0 } 139 140 #define FT_FRAME_BYTES( field, count ) \ 141 { \ 142 ft_frame_bytes, \ 143 count, \ 144 FT_FIELD_OFFSET( field ) \ 145 } 146 147 #define FT_FRAME_SKIP_BYTES( count ) { ft_frame_skip, count, 0 } 148 149 150 /*************************************************************************/ 151 /* */ 152 /* Integer extraction macros -- the `buffer' parameter must ALWAYS be of */ 153 /* type `char*' or equivalent (1-byte elements). */ 154 /* */ 155 156 #define FT_BYTE_( p, i ) ( ((const FT_Byte*)(p))[(i)] ) 157 158 #define FT_INT16( x ) ( (FT_Int16)(x) ) 159 #define FT_UINT16( x ) ( (FT_UInt16)(x) ) 160 #define FT_INT32( x ) ( (FT_Int32)(x) ) 161 #define FT_UINT32( x ) ( (FT_UInt32)(x) ) 162 163 164 #define FT_BYTE_U16( p, i, s ) ( FT_UINT16( FT_BYTE_( p, i ) ) << (s) ) 165 #define FT_BYTE_U32( p, i, s ) ( FT_UINT32( FT_BYTE_( p, i ) ) << (s) ) 166 167 168 #define FT_PEEK_SHORT( p ) FT_INT16( FT_BYTE_U16( p, 0, 8 ) | \ 169 FT_BYTE_U16( p, 1, 0 ) ) 170 171 #define FT_PEEK_USHORT( p ) FT_UINT16( FT_BYTE_U16( p, 0, 8 ) | \ 172 FT_BYTE_U16( p, 1, 0 ) ) 173 174 #define FT_PEEK_LONG( p ) FT_INT32( FT_BYTE_U32( p, 0, 24 ) | \ 175 FT_BYTE_U32( p, 1, 16 ) | \ 176 FT_BYTE_U32( p, 2, 8 ) | \ 177 FT_BYTE_U32( p, 3, 0 ) ) 178 179 #define FT_PEEK_ULONG( p ) FT_UINT32( FT_BYTE_U32( p, 0, 24 ) | \ 180 FT_BYTE_U32( p, 1, 16 ) | \ 181 FT_BYTE_U32( p, 2, 8 ) | \ 182 FT_BYTE_U32( p, 3, 0 ) ) 183 184 #define FT_PEEK_OFF3( p ) FT_INT32( FT_BYTE_U32( p, 0, 16 ) | \ 185 FT_BYTE_U32( p, 1, 8 ) | \ 186 FT_BYTE_U32( p, 2, 0 ) ) 187 188 #define FT_PEEK_UOFF3( p ) FT_UINT32( FT_BYTE_U32( p, 0, 16 ) | \ 189 FT_BYTE_U32( p, 1, 8 ) | \ 190 FT_BYTE_U32( p, 2, 0 ) ) 191 192 #define FT_PEEK_SHORT_LE( p ) FT_INT16( FT_BYTE_U16( p, 1, 8 ) | \ 193 FT_BYTE_U16( p, 0, 0 ) ) 194 195 #define FT_PEEK_USHORT_LE( p ) FT_UINT16( FT_BYTE_U16( p, 1, 8 ) | \ 196 FT_BYTE_U16( p, 0, 0 ) ) 197 198 #define FT_PEEK_LONG_LE( p ) FT_INT32( FT_BYTE_U32( p, 3, 24 ) | \ 199 FT_BYTE_U32( p, 2, 16 ) | \ 200 FT_BYTE_U32( p, 1, 8 ) | \ 201 FT_BYTE_U32( p, 0, 0 ) ) 202 203 #define FT_PEEK_ULONG_LE( p ) FT_UINT32( FT_BYTE_U32( p, 3, 24 ) | \ 204 FT_BYTE_U32( p, 2, 16 ) | \ 205 FT_BYTE_U32( p, 1, 8 ) | \ 206 FT_BYTE_U32( p, 0, 0 ) ) 207 208 #define FT_PEEK_OFF3_LE( p ) FT_INT32( FT_BYTE_U32( p, 2, 16 ) | \ 209 FT_BYTE_U32( p, 1, 8 ) | \ 210 FT_BYTE_U32( p, 0, 0 ) ) 211 212 #define FT_PEEK_UOFF3_LE( p ) FT_UINT32( FT_BYTE_U32( p, 2, 16 ) | \ 213 FT_BYTE_U32( p, 1, 8 ) | \ 214 FT_BYTE_U32( p, 0, 0 ) ) 215 216 217 #define FT_NEXT_CHAR( buffer ) \ 218 ( (signed char)*buffer++ ) 219 220 #define FT_NEXT_BYTE( buffer ) \ 221 ( (unsigned char)*buffer++ ) 222 223 #define FT_NEXT_SHORT( buffer ) \ 224 ( (short)( buffer += 2, FT_PEEK_SHORT( buffer - 2 ) ) ) 225 226 #define FT_NEXT_USHORT( buffer ) \ 227 ( (unsigned short)( buffer += 2, FT_PEEK_USHORT( buffer - 2 ) ) ) 228 229 #define FT_NEXT_OFF3( buffer ) \ 230 ( (long)( buffer += 3, FT_PEEK_OFF3( buffer - 3 ) ) ) 231 232 #define FT_NEXT_UOFF3( buffer ) \ 233 ( (unsigned long)( buffer += 3, FT_PEEK_UOFF3( buffer - 3 ) ) ) 234 235 #define FT_NEXT_LONG( buffer ) \ 236 ( (long)( buffer += 4, FT_PEEK_LONG( buffer - 4 ) ) ) 237 238 #define FT_NEXT_ULONG( buffer ) \ 239 ( (unsigned long)( buffer += 4, FT_PEEK_ULONG( buffer - 4 ) ) ) 240 241 242 #define FT_NEXT_SHORT_LE( buffer ) \ 243 ( (short)( buffer += 2, FT_PEEK_SHORT_LE( buffer - 2 ) ) ) 244 245 #define FT_NEXT_USHORT_LE( buffer ) \ 246 ( (unsigned short)( buffer += 2, FT_PEEK_USHORT_LE( buffer - 2 ) ) ) 247 248 #define FT_NEXT_OFF3_LE( buffer ) \ 249 ( (long)( buffer += 3, FT_PEEK_OFF3_LE( buffer - 3 ) ) ) 250 251 #define FT_NEXT_UOFF3_LE( buffer ) \ 252 ( (unsigned long)( buffer += 3, FT_PEEK_UOFF3_LE( buffer - 3 ) ) ) 253 254 #define FT_NEXT_LONG_LE( buffer ) \ 255 ( (long)( buffer += 4, FT_PEEK_LONG_LE( buffer - 4 ) ) ) 256 257 #define FT_NEXT_ULONG_LE( buffer ) \ 258 ( (unsigned long)( buffer += 4, FT_PEEK_ULONG_LE( buffer - 4 ) ) ) 259 260 261 /*************************************************************************/ 262 /* */ 263 /* Each GET_xxxx() macro uses an implicit `stream' variable. */ 264 /* */ 265 #if 0 266 #define FT_GET_MACRO( type ) FT_NEXT_ ## type ( stream->cursor ) 267 268 #define FT_GET_CHAR() FT_GET_MACRO( CHAR ) 269 #define FT_GET_BYTE() FT_GET_MACRO( BYTE ) 270 #define FT_GET_SHORT() FT_GET_MACRO( SHORT ) 271 #define FT_GET_USHORT() FT_GET_MACRO( USHORT ) 272 #define FT_GET_OFF3() FT_GET_MACRO( OFF3 ) 273 #define FT_GET_UOFF3() FT_GET_MACRO( UOFF3 ) 274 #define FT_GET_LONG() FT_GET_MACRO( LONG ) 275 #define FT_GET_ULONG() FT_GET_MACRO( ULONG ) 276 #define FT_GET_TAG4() FT_GET_MACRO( ULONG ) 277 278 #define FT_GET_SHORT_LE() FT_GET_MACRO( SHORT_LE ) 279 #define FT_GET_USHORT_LE() FT_GET_MACRO( USHORT_LE ) 280 #define FT_GET_LONG_LE() FT_GET_MACRO( LONG_LE ) 281 #define FT_GET_ULONG_LE() FT_GET_MACRO( ULONG_LE ) 282 283 #else 284 #define FT_GET_MACRO( func, type ) ( (type)func( stream ) ) 285 286 #define FT_GET_CHAR() FT_GET_MACRO( FT_Stream_GetChar, FT_Char ) 287 #define FT_GET_BYTE() FT_GET_MACRO( FT_Stream_GetChar, FT_Byte ) 288 #define FT_GET_SHORT() FT_GET_MACRO( FT_Stream_GetUShort, FT_Short ) 289 #define FT_GET_USHORT() FT_GET_MACRO( FT_Stream_GetUShort, FT_UShort ) 290 #define FT_GET_OFF3() FT_GET_MACRO( FT_Stream_GetUOffset, FT_Long ) 291 #define FT_GET_UOFF3() FT_GET_MACRO( FT_Stream_GetUOffset, FT_ULong ) 292 #define FT_GET_LONG() FT_GET_MACRO( FT_Stream_GetULong, FT_Long ) 293 #define FT_GET_ULONG() FT_GET_MACRO( FT_Stream_GetULong, FT_ULong ) 294 #define FT_GET_TAG4() FT_GET_MACRO( FT_Stream_GetULong, FT_ULong ) 295 296 #define FT_GET_SHORT_LE() FT_GET_MACRO( FT_Stream_GetUShortLE, FT_Short ) 297 #define FT_GET_USHORT_LE() FT_GET_MACRO( FT_Stream_GetUShortLE, FT_UShort ) 298 #define FT_GET_LONG_LE() FT_GET_MACRO( FT_Stream_GetULongLE, FT_Long ) 299 #define FT_GET_ULONG_LE() FT_GET_MACRO( FT_Stream_GetULongLE, FT_ULong ) 300 #endif 301 302 #define FT_READ_MACRO( func, type, var ) \ 303 ( var = (type)func( stream, &error ), \ 304 error != FT_Err_Ok ) 305 306 #define FT_READ_BYTE( var ) FT_READ_MACRO( FT_Stream_ReadChar, FT_Byte, var ) 307 #define FT_READ_CHAR( var ) FT_READ_MACRO( FT_Stream_ReadChar, FT_Char, var ) 308 #define FT_READ_SHORT( var ) FT_READ_MACRO( FT_Stream_ReadUShort, FT_Short, var ) 309 #define FT_READ_USHORT( var ) FT_READ_MACRO( FT_Stream_ReadUShort, FT_UShort, var ) 310 #define FT_READ_OFF3( var ) FT_READ_MACRO( FT_Stream_ReadUOffset, FT_Long, var ) 311 #define FT_READ_UOFF3( var ) FT_READ_MACRO( FT_Stream_ReadUOffset, FT_ULong, var ) 312 #define FT_READ_LONG( var ) FT_READ_MACRO( FT_Stream_ReadULong, FT_Long, var ) 313 #define FT_READ_ULONG( var ) FT_READ_MACRO( FT_Stream_ReadULong, FT_ULong, var ) 314 315 #define FT_READ_SHORT_LE( var ) FT_READ_MACRO( FT_Stream_ReadUShortLE, FT_Short, var ) 316 #define FT_READ_USHORT_LE( var ) FT_READ_MACRO( FT_Stream_ReadUShortLE, FT_UShort, var ) 317 #define FT_READ_LONG_LE( var ) FT_READ_MACRO( FT_Stream_ReadULongLE, FT_Long, var ) 318 #define FT_READ_ULONG_LE( var ) FT_READ_MACRO( FT_Stream_ReadULongLE, FT_ULong, var ) 319 320 321 #ifndef FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM 322 323 /* initialize a stream for reading a regular system stream */ 324 FT_BASE( FT_Error ) 325 FT_Stream_Open( FT_Stream stream, 326 const char* filepathname ); 327 328 #endif /* FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM */ 329 330 331 /* create a new (input) stream from an FT_Open_Args structure */ 332 FT_BASE( FT_Error ) 333 FT_Stream_New( FT_Library library, 334 const FT_Open_Args* args, 335 FT_Stream *astream ); 336 337 /* free a stream */ 338 FT_BASE( void ) 339 FT_Stream_Free( FT_Stream stream, 340 FT_Int external ); 341 342 /* initialize a stream for reading in-memory data */ 343 FT_BASE( void ) 344 FT_Stream_OpenMemory( FT_Stream stream, 345 const FT_Byte* base, 346 FT_ULong size ); 347 348 /* close a stream (does not destroy the stream structure) */ 349 FT_BASE( void ) 350 FT_Stream_Close( FT_Stream stream ); 351 352 353 /* seek within a stream. position is relative to start of stream */ 354 FT_BASE( FT_Error ) 355 FT_Stream_Seek( FT_Stream stream, 356 FT_ULong pos ); 357 358 /* skip bytes in a stream */ 359 FT_BASE( FT_Error ) 360 FT_Stream_Skip( FT_Stream stream, 361 FT_Long distance ); 362 363 /* return current stream position */ 364 FT_BASE( FT_ULong ) 365 FT_Stream_Pos( FT_Stream stream ); 366 367 /* read bytes from a stream into a user-allocated buffer, returns an */ 368 /* error if not all bytes could be read. */ 369 FT_BASE( FT_Error ) 370 FT_Stream_Read( FT_Stream stream, 371 FT_Byte* buffer, 372 FT_ULong count ); 373 374 /* read bytes from a stream at a given position */ 375 FT_BASE( FT_Error ) 376 FT_Stream_ReadAt( FT_Stream stream, 377 FT_ULong pos, 378 FT_Byte* buffer, 379 FT_ULong count ); 380 381 /* try to read bytes at the end of a stream; return number of bytes */ 382 /* really available */ 383 FT_BASE( FT_ULong ) 384 FT_Stream_TryRead( FT_Stream stream, 385 FT_Byte* buffer, 386 FT_ULong count ); 387 388 /* Enter a frame of `count' consecutive bytes in a stream. Returns an */ 389 /* error if the frame could not be read/accessed. The caller can use */ 390 /* the FT_Stream_Get_XXX functions to retrieve frame data without */ 391 /* error checks. */ 392 /* */ 393 /* You must _always_ call FT_Stream_ExitFrame() once you have entered */ 394 /* a stream frame! */ 395 /* */ 396 FT_BASE( FT_Error ) 397 FT_Stream_EnterFrame( FT_Stream stream, 398 FT_ULong count ); 399 400 /* exit a stream frame */ 401 FT_BASE( void ) 402 FT_Stream_ExitFrame( FT_Stream stream ); 403 404 /* Extract a stream frame. If the stream is disk-based, a heap block */ 405 /* is allocated and the frame bytes are read into it. If the stream */ 406 /* is memory-based, this function simply set a pointer to the data. */ 407 /* */ 408 /* Useful to optimize access to memory-based streams transparently. */ 409 /* */ 410 /* All extracted frames must be `freed' with a call to the function */ 411 /* FT_Stream_ReleaseFrame(). */ 412 /* */ 413 FT_BASE( FT_Error ) 414 FT_Stream_ExtractFrame( FT_Stream stream, 415 FT_ULong count, 416 FT_Byte** pbytes ); 417 418 /* release an extract frame (see FT_Stream_ExtractFrame) */ 419 FT_BASE( void ) 420 FT_Stream_ReleaseFrame( FT_Stream stream, 421 FT_Byte** pbytes ); 422 423 /* read a byte from an entered frame */ 424 FT_BASE( FT_Char ) 425 FT_Stream_GetChar( FT_Stream stream ); 426 427 /* read a 16-bit big-endian unsigned integer from an entered frame */ 428 FT_BASE( FT_UShort ) 429 FT_Stream_GetUShort( FT_Stream stream ); 430 431 /* read a 24-bit big-endian unsigned integer from an entered frame */ 432 FT_BASE( FT_ULong ) 433 FT_Stream_GetUOffset( FT_Stream stream ); 434 435 /* read a 32-bit big-endian unsigned integer from an entered frame */ 436 FT_BASE( FT_ULong ) 437 FT_Stream_GetULong( FT_Stream stream ); 438 439 /* read a 16-bit little-endian unsigned integer from an entered frame */ 440 FT_BASE( FT_UShort ) 441 FT_Stream_GetUShortLE( FT_Stream stream ); 442 443 /* read a 32-bit little-endian unsigned integer from an entered frame */ 444 FT_BASE( FT_ULong ) 445 FT_Stream_GetULongLE( FT_Stream stream ); 446 447 448 /* read a byte from a stream */ 449 FT_BASE( FT_Char ) 450 FT_Stream_ReadChar( FT_Stream stream, 451 FT_Error* error ); 452 453 /* read a 16-bit big-endian unsigned integer from a stream */ 454 FT_BASE( FT_UShort ) 455 FT_Stream_ReadUShort( FT_Stream stream, 456 FT_Error* error ); 457 458 /* read a 24-bit big-endian unsigned integer from a stream */ 459 FT_BASE( FT_ULong ) 460 FT_Stream_ReadUOffset( FT_Stream stream, 461 FT_Error* error ); 462 463 /* read a 32-bit big-endian integer from a stream */ 464 FT_BASE( FT_ULong ) 465 FT_Stream_ReadULong( FT_Stream stream, 466 FT_Error* error ); 467 468 /* read a 16-bit little-endian unsigned integer from a stream */ 469 FT_BASE( FT_UShort ) 470 FT_Stream_ReadUShortLE( FT_Stream stream, 471 FT_Error* error ); 472 473 /* read a 32-bit little-endian unsigned integer from a stream */ 474 FT_BASE( FT_ULong ) 475 FT_Stream_ReadULongLE( FT_Stream stream, 476 FT_Error* error ); 477 478 /* Read a structure from a stream. The structure must be described */ 479 /* by an array of FT_Frame_Field records. */ 480 FT_BASE( FT_Error ) 481 FT_Stream_ReadFields( FT_Stream stream, 482 const FT_Frame_Field* fields, 483 void* structure ); 484 485 486 #define FT_STREAM_POS() \ 487 FT_Stream_Pos( stream ) 488 489 #define FT_STREAM_SEEK( position ) \ 490 FT_SET_ERROR( FT_Stream_Seek( stream, \ 491 (FT_ULong)(position) ) ) 492 493 #define FT_STREAM_SKIP( distance ) \ 494 FT_SET_ERROR( FT_Stream_Skip( stream, \ 495 (FT_Long)(distance) ) ) 496 497 #define FT_STREAM_READ( buffer, count ) \ 498 FT_SET_ERROR( FT_Stream_Read( stream, \ 499 (FT_Byte*)(buffer), \ 500 (FT_ULong)(count) ) ) 501 502 #define FT_STREAM_READ_AT( position, buffer, count ) \ 503 FT_SET_ERROR( FT_Stream_ReadAt( stream, \ 504 (FT_ULong)(position), \ 505 (FT_Byte*)(buffer), \ 506 (FT_ULong)(count) ) ) 507 508 #define FT_STREAM_READ_FIELDS( fields, object ) \ 509 FT_SET_ERROR( FT_Stream_ReadFields( stream, fields, object ) ) 510 511 512 #define FT_FRAME_ENTER( size ) \ 513 FT_SET_ERROR( \ 514 FT_DEBUG_INNER( FT_Stream_EnterFrame( stream, \ 515 (FT_ULong)(size) ) ) ) 516 517 #define FT_FRAME_EXIT() \ 518 FT_DEBUG_INNER( FT_Stream_ExitFrame( stream ) ) 519 520 #define FT_FRAME_EXTRACT( size, bytes ) \ 521 FT_SET_ERROR( \ 522 FT_DEBUG_INNER( FT_Stream_ExtractFrame( stream, \ 523 (FT_ULong)(size), \ 524 (FT_Byte**)&(bytes) ) ) ) 525 526 #define FT_FRAME_RELEASE( bytes ) \ 527 FT_DEBUG_INNER( FT_Stream_ReleaseFrame( stream, \ 528 (FT_Byte**)&(bytes) ) ) 529 530 531 FT_END_HEADER 532 533 #endif /* FTSTREAM_H_ */ 534 535 536 /* END */ 537