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 /* 169 * `FT_PEEK_XXX' are generic macros to get data from a buffer position. 170 * No safety checks are performed. 171 */ 172 #define FT_PEEK_SHORT( p ) FT_INT16( FT_BYTE_U16( p, 0, 8 ) | \ 173 FT_BYTE_U16( p, 1, 0 ) ) 174 175 #define FT_PEEK_USHORT( p ) FT_UINT16( FT_BYTE_U16( p, 0, 8 ) | \ 176 FT_BYTE_U16( p, 1, 0 ) ) 177 178 #define FT_PEEK_LONG( p ) FT_INT32( FT_BYTE_U32( p, 0, 24 ) | \ 179 FT_BYTE_U32( p, 1, 16 ) | \ 180 FT_BYTE_U32( p, 2, 8 ) | \ 181 FT_BYTE_U32( p, 3, 0 ) ) 182 183 #define FT_PEEK_ULONG( p ) FT_UINT32( FT_BYTE_U32( p, 0, 24 ) | \ 184 FT_BYTE_U32( p, 1, 16 ) | \ 185 FT_BYTE_U32( p, 2, 8 ) | \ 186 FT_BYTE_U32( p, 3, 0 ) ) 187 188 #define FT_PEEK_OFF3( p ) FT_INT32( 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_UOFF3( p ) FT_UINT32( FT_BYTE_U32( p, 0, 16 ) | \ 193 FT_BYTE_U32( p, 1, 8 ) | \ 194 FT_BYTE_U32( p, 2, 0 ) ) 195 196 #define FT_PEEK_SHORT_LE( p ) FT_INT16( FT_BYTE_U16( p, 1, 8 ) | \ 197 FT_BYTE_U16( p, 0, 0 ) ) 198 199 #define FT_PEEK_USHORT_LE( p ) FT_UINT16( FT_BYTE_U16( p, 1, 8 ) | \ 200 FT_BYTE_U16( p, 0, 0 ) ) 201 202 #define FT_PEEK_LONG_LE( p ) FT_INT32( FT_BYTE_U32( p, 3, 24 ) | \ 203 FT_BYTE_U32( p, 2, 16 ) | \ 204 FT_BYTE_U32( p, 1, 8 ) | \ 205 FT_BYTE_U32( p, 0, 0 ) ) 206 207 #define FT_PEEK_ULONG_LE( p ) FT_UINT32( FT_BYTE_U32( p, 3, 24 ) | \ 208 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_OFF3_LE( p ) FT_INT32( FT_BYTE_U32( p, 2, 16 ) | \ 213 FT_BYTE_U32( p, 1, 8 ) | \ 214 FT_BYTE_U32( p, 0, 0 ) ) 215 216 #define FT_PEEK_UOFF3_LE( p ) FT_UINT32( FT_BYTE_U32( p, 2, 16 ) | \ 217 FT_BYTE_U32( p, 1, 8 ) | \ 218 FT_BYTE_U32( p, 0, 0 ) ) 219 220 /* 221 * `FT_NEXT_XXX' are generic macros to get data from a buffer position 222 * which is then increased appropriately. No safety checks are performed. 223 */ 224 #define FT_NEXT_CHAR( buffer ) \ 225 ( (signed char)*buffer++ ) 226 227 #define FT_NEXT_BYTE( buffer ) \ 228 ( (unsigned char)*buffer++ ) 229 230 #define FT_NEXT_SHORT( buffer ) \ 231 ( (short)( buffer += 2, FT_PEEK_SHORT( buffer - 2 ) ) ) 232 233 #define FT_NEXT_USHORT( buffer ) \ 234 ( (unsigned short)( buffer += 2, FT_PEEK_USHORT( buffer - 2 ) ) ) 235 236 #define FT_NEXT_OFF3( buffer ) \ 237 ( (long)( buffer += 3, FT_PEEK_OFF3( buffer - 3 ) ) ) 238 239 #define FT_NEXT_UOFF3( buffer ) \ 240 ( (unsigned long)( buffer += 3, FT_PEEK_UOFF3( buffer - 3 ) ) ) 241 242 #define FT_NEXT_LONG( buffer ) \ 243 ( (long)( buffer += 4, FT_PEEK_LONG( buffer - 4 ) ) ) 244 245 #define FT_NEXT_ULONG( buffer ) \ 246 ( (unsigned long)( buffer += 4, FT_PEEK_ULONG( buffer - 4 ) ) ) 247 248 249 #define FT_NEXT_SHORT_LE( buffer ) \ 250 ( (short)( buffer += 2, FT_PEEK_SHORT_LE( buffer - 2 ) ) ) 251 252 #define FT_NEXT_USHORT_LE( buffer ) \ 253 ( (unsigned short)( buffer += 2, FT_PEEK_USHORT_LE( buffer - 2 ) ) ) 254 255 #define FT_NEXT_OFF3_LE( buffer ) \ 256 ( (long)( buffer += 3, FT_PEEK_OFF3_LE( buffer - 3 ) ) ) 257 258 #define FT_NEXT_UOFF3_LE( buffer ) \ 259 ( (unsigned long)( buffer += 3, FT_PEEK_UOFF3_LE( buffer - 3 ) ) ) 260 261 #define FT_NEXT_LONG_LE( buffer ) \ 262 ( (long)( buffer += 4, FT_PEEK_LONG_LE( buffer - 4 ) ) ) 263 264 #define FT_NEXT_ULONG_LE( buffer ) \ 265 ( (unsigned long)( buffer += 4, FT_PEEK_ULONG_LE( buffer - 4 ) ) ) 266 267 268 /************************************************************************** 269 * 270 * The `FT_GET_XXX' macros use an implicit `stream' variable. 271 * 272 * Note that a call to `FT_STREAM_SEEK' or `FT_STREAM_POS' has *no* effect 273 * on `FT_GET_XXX'! They operate on `stream->pos', while `FT_GET_XXX' use 274 * `stream->cursor'. 275 */ 276 #if 0 277 #define FT_GET_MACRO( type ) FT_NEXT_ ## type ( stream->cursor ) 278 279 #define FT_GET_CHAR() FT_GET_MACRO( CHAR ) 280 #define FT_GET_BYTE() FT_GET_MACRO( BYTE ) 281 #define FT_GET_SHORT() FT_GET_MACRO( SHORT ) 282 #define FT_GET_USHORT() FT_GET_MACRO( USHORT ) 283 #define FT_GET_OFF3() FT_GET_MACRO( OFF3 ) 284 #define FT_GET_UOFF3() FT_GET_MACRO( UOFF3 ) 285 #define FT_GET_LONG() FT_GET_MACRO( LONG ) 286 #define FT_GET_ULONG() FT_GET_MACRO( ULONG ) 287 #define FT_GET_TAG4() FT_GET_MACRO( ULONG ) 288 289 #define FT_GET_SHORT_LE() FT_GET_MACRO( SHORT_LE ) 290 #define FT_GET_USHORT_LE() FT_GET_MACRO( USHORT_LE ) 291 #define FT_GET_LONG_LE() FT_GET_MACRO( LONG_LE ) 292 #define FT_GET_ULONG_LE() FT_GET_MACRO( ULONG_LE ) 293 294 #else 295 #define FT_GET_MACRO( func, type ) ( (type)func( stream ) ) 296 297 #define FT_GET_CHAR() FT_GET_MACRO( FT_Stream_GetChar, FT_Char ) 298 #define FT_GET_BYTE() FT_GET_MACRO( FT_Stream_GetChar, FT_Byte ) 299 #define FT_GET_SHORT() FT_GET_MACRO( FT_Stream_GetUShort, FT_Short ) 300 #define FT_GET_USHORT() FT_GET_MACRO( FT_Stream_GetUShort, FT_UShort ) 301 #define FT_GET_OFF3() FT_GET_MACRO( FT_Stream_GetUOffset, FT_Long ) 302 #define FT_GET_UOFF3() FT_GET_MACRO( FT_Stream_GetUOffset, FT_ULong ) 303 #define FT_GET_LONG() FT_GET_MACRO( FT_Stream_GetULong, FT_Long ) 304 #define FT_GET_ULONG() FT_GET_MACRO( FT_Stream_GetULong, FT_ULong ) 305 #define FT_GET_TAG4() FT_GET_MACRO( FT_Stream_GetULong, FT_ULong ) 306 307 #define FT_GET_SHORT_LE() FT_GET_MACRO( FT_Stream_GetUShortLE, FT_Short ) 308 #define FT_GET_USHORT_LE() FT_GET_MACRO( FT_Stream_GetUShortLE, FT_UShort ) 309 #define FT_GET_LONG_LE() FT_GET_MACRO( FT_Stream_GetULongLE, FT_Long ) 310 #define FT_GET_ULONG_LE() FT_GET_MACRO( FT_Stream_GetULongLE, FT_ULong ) 311 #endif 312 313 314 #define FT_READ_MACRO( func, type, var ) \ 315 ( var = (type)func( stream, &error ), \ 316 error != FT_Err_Ok ) 317 318 /* 319 * The `FT_READ_XXX' macros use implicit `stream' and `error' variables. 320 * 321 * `FT_READ_XXX' can be controlled with `FT_STREAM_SEEK' and 322 * `FT_STREAM_POS'. They use the full machinery to check whether a read 323 * is valid. 324 */ 325 #define FT_READ_BYTE( var ) FT_READ_MACRO( FT_Stream_ReadChar, FT_Byte, var ) 326 #define FT_READ_CHAR( var ) FT_READ_MACRO( FT_Stream_ReadChar, FT_Char, var ) 327 #define FT_READ_SHORT( var ) FT_READ_MACRO( FT_Stream_ReadUShort, FT_Short, var ) 328 #define FT_READ_USHORT( var ) FT_READ_MACRO( FT_Stream_ReadUShort, FT_UShort, var ) 329 #define FT_READ_OFF3( var ) FT_READ_MACRO( FT_Stream_ReadUOffset, FT_Long, var ) 330 #define FT_READ_UOFF3( var ) FT_READ_MACRO( FT_Stream_ReadUOffset, FT_ULong, var ) 331 #define FT_READ_LONG( var ) FT_READ_MACRO( FT_Stream_ReadULong, FT_Long, var ) 332 #define FT_READ_ULONG( var ) FT_READ_MACRO( FT_Stream_ReadULong, FT_ULong, var ) 333 334 #define FT_READ_SHORT_LE( var ) FT_READ_MACRO( FT_Stream_ReadUShortLE, FT_Short, var ) 335 #define FT_READ_USHORT_LE( var ) FT_READ_MACRO( FT_Stream_ReadUShortLE, FT_UShort, var ) 336 #define FT_READ_LONG_LE( var ) FT_READ_MACRO( FT_Stream_ReadULongLE, FT_Long, var ) 337 #define FT_READ_ULONG_LE( var ) FT_READ_MACRO( FT_Stream_ReadULongLE, FT_ULong, var ) 338 339 340 #ifndef FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM 341 342 /* initialize a stream for reading a regular system stream */ 343 FT_BASE( FT_Error ) 344 FT_Stream_Open( FT_Stream stream, 345 const char* filepathname ); 346 347 #endif /* FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM */ 348 349 350 /* create a new (input) stream from an FT_Open_Args structure */ 351 FT_BASE( FT_Error ) 352 FT_Stream_New( FT_Library library, 353 const FT_Open_Args* args, 354 FT_Stream *astream ); 355 356 /* free a stream */ 357 FT_BASE( void ) 358 FT_Stream_Free( FT_Stream stream, 359 FT_Int external ); 360 361 /* initialize a stream for reading in-memory data */ 362 FT_BASE( void ) 363 FT_Stream_OpenMemory( FT_Stream stream, 364 const FT_Byte* base, 365 FT_ULong size ); 366 367 /* close a stream (does not destroy the stream structure) */ 368 FT_BASE( void ) 369 FT_Stream_Close( FT_Stream stream ); 370 371 372 /* seek within a stream. position is relative to start of stream */ 373 FT_BASE( FT_Error ) 374 FT_Stream_Seek( FT_Stream stream, 375 FT_ULong pos ); 376 377 /* skip bytes in a stream */ 378 FT_BASE( FT_Error ) 379 FT_Stream_Skip( FT_Stream stream, 380 FT_Long distance ); 381 382 /* return current stream position */ 383 FT_BASE( FT_ULong ) 384 FT_Stream_Pos( FT_Stream stream ); 385 386 /* read bytes from a stream into a user-allocated buffer, returns an */ 387 /* error if not all bytes could be read. */ 388 FT_BASE( FT_Error ) 389 FT_Stream_Read( FT_Stream stream, 390 FT_Byte* buffer, 391 FT_ULong count ); 392 393 /* read bytes from a stream at a given position */ 394 FT_BASE( FT_Error ) 395 FT_Stream_ReadAt( FT_Stream stream, 396 FT_ULong pos, 397 FT_Byte* buffer, 398 FT_ULong count ); 399 400 /* try to read bytes at the end of a stream; return number of bytes */ 401 /* really available */ 402 FT_BASE( FT_ULong ) 403 FT_Stream_TryRead( FT_Stream stream, 404 FT_Byte* buffer, 405 FT_ULong count ); 406 407 /* Enter a frame of `count' consecutive bytes in a stream. Returns an */ 408 /* error if the frame could not be read/accessed. The caller can use */ 409 /* the `FT_Stream_Get_XXX' functions to retrieve frame data without */ 410 /* error checks. */ 411 /* */ 412 /* You must _always_ call `FT_Stream_ExitFrame' once you have entered */ 413 /* a stream frame! */ 414 /* */ 415 FT_BASE( FT_Error ) 416 FT_Stream_EnterFrame( FT_Stream stream, 417 FT_ULong count ); 418 419 /* exit a stream frame */ 420 FT_BASE( void ) 421 FT_Stream_ExitFrame( FT_Stream stream ); 422 423 /* Extract a stream frame. If the stream is disk-based, a heap block */ 424 /* is allocated and the frame bytes are read into it. If the stream */ 425 /* is memory-based, this function simply set a pointer to the data. */ 426 /* */ 427 /* Useful to optimize access to memory-based streams transparently. */ 428 /* */ 429 /* All extracted frames must be `freed' with a call to the function */ 430 /* FT_Stream_ReleaseFrame(). */ 431 /* */ 432 FT_BASE( FT_Error ) 433 FT_Stream_ExtractFrame( FT_Stream stream, 434 FT_ULong count, 435 FT_Byte** pbytes ); 436 437 /* release an extract frame (see `FT_Stream_ExtractFrame') */ 438 FT_BASE( void ) 439 FT_Stream_ReleaseFrame( FT_Stream stream, 440 FT_Byte** pbytes ); 441 442 /* read a byte from an entered frame */ 443 FT_BASE( FT_Char ) 444 FT_Stream_GetChar( FT_Stream stream ); 445 446 /* read a 16-bit big-endian unsigned integer from an entered frame */ 447 FT_BASE( FT_UShort ) 448 FT_Stream_GetUShort( FT_Stream stream ); 449 450 /* read a 24-bit big-endian unsigned integer from an entered frame */ 451 FT_BASE( FT_ULong ) 452 FT_Stream_GetUOffset( FT_Stream stream ); 453 454 /* read a 32-bit big-endian unsigned integer from an entered frame */ 455 FT_BASE( FT_ULong ) 456 FT_Stream_GetULong( FT_Stream stream ); 457 458 /* read a 16-bit little-endian unsigned integer from an entered frame */ 459 FT_BASE( FT_UShort ) 460 FT_Stream_GetUShortLE( FT_Stream stream ); 461 462 /* read a 32-bit little-endian unsigned integer from an entered frame */ 463 FT_BASE( FT_ULong ) 464 FT_Stream_GetULongLE( FT_Stream stream ); 465 466 467 /* read a byte from a stream */ 468 FT_BASE( FT_Char ) 469 FT_Stream_ReadChar( FT_Stream stream, 470 FT_Error* error ); 471 472 /* read a 16-bit big-endian unsigned integer from a stream */ 473 FT_BASE( FT_UShort ) 474 FT_Stream_ReadUShort( FT_Stream stream, 475 FT_Error* error ); 476 477 /* read a 24-bit big-endian unsigned integer from a stream */ 478 FT_BASE( FT_ULong ) 479 FT_Stream_ReadUOffset( FT_Stream stream, 480 FT_Error* error ); 481 482 /* read a 32-bit big-endian integer from a stream */ 483 FT_BASE( FT_ULong ) 484 FT_Stream_ReadULong( FT_Stream stream, 485 FT_Error* error ); 486 487 /* read a 16-bit little-endian unsigned integer from a stream */ 488 FT_BASE( FT_UShort ) 489 FT_Stream_ReadUShortLE( FT_Stream stream, 490 FT_Error* error ); 491 492 /* read a 32-bit little-endian unsigned integer from a stream */ 493 FT_BASE( FT_ULong ) 494 FT_Stream_ReadULongLE( FT_Stream stream, 495 FT_Error* error ); 496 497 /* Read a structure from a stream. The structure must be described */ 498 /* by an array of FT_Frame_Field records. */ 499 FT_BASE( FT_Error ) 500 FT_Stream_ReadFields( FT_Stream stream, 501 const FT_Frame_Field* fields, 502 void* structure ); 503 504 505 #define FT_STREAM_POS() \ 506 FT_Stream_Pos( stream ) 507 508 #define FT_STREAM_SEEK( position ) \ 509 FT_SET_ERROR( FT_Stream_Seek( stream, \ 510 (FT_ULong)(position) ) ) 511 512 #define FT_STREAM_SKIP( distance ) \ 513 FT_SET_ERROR( FT_Stream_Skip( stream, \ 514 (FT_Long)(distance) ) ) 515 516 #define FT_STREAM_READ( buffer, count ) \ 517 FT_SET_ERROR( FT_Stream_Read( stream, \ 518 (FT_Byte*)(buffer), \ 519 (FT_ULong)(count) ) ) 520 521 #define FT_STREAM_READ_AT( position, buffer, count ) \ 522 FT_SET_ERROR( FT_Stream_ReadAt( stream, \ 523 (FT_ULong)(position), \ 524 (FT_Byte*)(buffer), \ 525 (FT_ULong)(count) ) ) 526 527 #define FT_STREAM_READ_FIELDS( fields, object ) \ 528 FT_SET_ERROR( FT_Stream_ReadFields( stream, fields, object ) ) 529 530 531 #define FT_FRAME_ENTER( size ) \ 532 FT_SET_ERROR( \ 533 FT_DEBUG_INNER( FT_Stream_EnterFrame( stream, \ 534 (FT_ULong)(size) ) ) ) 535 536 #define FT_FRAME_EXIT() \ 537 FT_DEBUG_INNER( FT_Stream_ExitFrame( stream ) ) 538 539 #define FT_FRAME_EXTRACT( size, bytes ) \ 540 FT_SET_ERROR( \ 541 FT_DEBUG_INNER( FT_Stream_ExtractFrame( stream, \ 542 (FT_ULong)(size), \ 543 (FT_Byte**)&(bytes) ) ) ) 544 545 #define FT_FRAME_RELEASE( bytes ) \ 546 FT_DEBUG_INNER( FT_Stream_ReleaseFrame( stream, \ 547 (FT_Byte**)&(bytes) ) ) 548 549 550 FT_END_HEADER 551 552 #endif /* FTSTREAM_H_ */ 553 554 555 /* END */ 556
