ftstream.h revision f463818dd9146e11105c0572fb119e757eb47768
1/***************************************************************************/ 2/* */ 3/* ftstream.h */ 4/* */ 5/* Stream handling (specification). */ 6/* */ 7/* Copyright 1996-2001, 2002, 2004, 2005, 2006 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 28FT_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#define FT_INT8_( p, i ) ( ((const FT_Char*)(p))[(i)] ) 158 159#define FT_INT16( x ) ( (FT_Int16)(x) ) 160#define FT_UINT16( x ) ( (FT_UInt16)(x) ) 161#define FT_INT32( x ) ( (FT_Int32)(x) ) 162#define FT_UINT32( x ) ( (FT_UInt32)(x) ) 163 164#define FT_BYTE_I16( p, i, s ) ( FT_INT16( FT_BYTE_( p, i ) ) << (s) ) 165#define FT_BYTE_U16( p, i, s ) ( FT_UINT16( FT_BYTE_( p, i ) ) << (s) ) 166#define FT_BYTE_I32( p, i, s ) ( FT_INT32( FT_BYTE_( p, i ) ) << (s) ) 167#define FT_BYTE_U32( p, i, s ) ( FT_UINT32( FT_BYTE_( p, i ) ) << (s) ) 168 169#define FT_INT8_I16( p, i, s ) ( FT_INT16( FT_INT8_( p, i ) ) << (s) ) 170#define FT_INT8_U16( p, i, s ) ( FT_UINT16( FT_INT8_( p, i ) ) << (s) ) 171#define FT_INT8_I32( p, i, s ) ( FT_INT32( FT_INT8_( p, i ) ) << (s) ) 172#define FT_INT8_U32( p, i, s ) ( FT_UINT32( FT_INT8_( p, i ) ) << (s) ) 173 174 175#define FT_PEEK_SHORT( p ) FT_INT16( FT_INT8_I16( p, 0, 8) | \ 176 FT_BYTE_I16( p, 1, 0) ) 177 178#define FT_PEEK_USHORT( p ) FT_UINT16( FT_BYTE_U16( p, 0, 8 ) | \ 179 FT_BYTE_U16( p, 1, 0 ) ) 180 181#define FT_PEEK_LONG( p ) FT_INT32( FT_INT8_I32( p, 0, 24 ) | \ 182 FT_BYTE_I32( p, 1, 16 ) | \ 183 FT_BYTE_I32( p, 2, 8 ) | \ 184 FT_BYTE_I32( p, 3, 0 ) ) 185 186#define FT_PEEK_ULONG( p ) FT_UINT32( FT_BYTE_U32( p, 0, 24 ) | \ 187 FT_BYTE_U32( p, 1, 16 ) | \ 188 FT_BYTE_U32( p, 2, 8 ) | \ 189 FT_BYTE_U32( p, 3, 0 ) ) 190 191#define FT_PEEK_OFF3( p ) FT_INT32( FT_INT8_I32( p, 0, 16 ) | \ 192 FT_BYTE_I32( p, 1, 8 ) | \ 193 FT_BYTE_I32( p, 2, 0 ) ) 194 195#define FT_PEEK_UOFF3( p ) FT_UINT32( FT_BYTE_U32( p, 0, 16 ) | \ 196 FT_BYTE_U32( p, 1, 8 ) | \ 197 FT_BYTE_U32( p, 2, 0 ) ) 198 199#define FT_PEEK_SHORT_LE( p ) FT_INT16( FT_INT8_I16( p, 1, 8 ) | \ 200 FT_BYTE_I16( p, 0, 0 ) ) 201 202#define FT_PEEK_USHORT_LE( p ) FT_UINT16( FT_BYTE_U16( p, 1, 8 ) | \ 203 FT_BYTE_U16( p, 0, 0 ) ) 204 205#define FT_PEEK_LONG_LE( p ) FT_INT32( FT_INT8_I32( p, 3, 24 ) | \ 206 FT_BYTE_I32( p, 2, 16 ) | \ 207 FT_BYTE_I32( p, 1, 8 ) | \ 208 FT_BYTE_I32( p, 0, 0 ) ) 209 210#define FT_PEEK_ULONG_LE( p ) FT_UINT32( FT_BYTE_U32( p, 3, 24 ) | \ 211 FT_BYTE_U32( p, 2, 16 ) | \ 212 FT_BYTE_U32( p, 1, 8 ) | \ 213 FT_BYTE_U32( p, 0, 0 ) ) 214 215#define FT_PEEK_OFF3_LE( p ) FT_INT32( FT_INT8_I32( p, 2, 16 ) | \ 216 FT_BYTE_I32( p, 1, 8 ) | \ 217 FT_BYTE_I32( p, 0, 0 ) ) 218 219#define FT_PEEK_UOFF3_LE( p ) FT_UINT32( FT_BYTE_U32( p, 2, 16 ) | \ 220 FT_BYTE_U32( p, 1, 8 ) | \ 221 FT_BYTE_U32( p, 0, 0 ) ) 222 223 224#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 /* Each GET_xxxx() macro uses an implicit `stream' variable. */ 271 /* */ 272#if 0 273#define FT_GET_MACRO( type ) FT_NEXT_ ## type ( stream->cursor ) 274 275#define FT_GET_CHAR() FT_GET_MACRO( CHAR ) 276#define FT_GET_BYTE() FT_GET_MACRO( BYTE ) 277#define FT_GET_SHORT() FT_GET_MACRO( SHORT ) 278#define FT_GET_USHORT() FT_GET_MACRO( USHORT ) 279#define FT_GET_OFF3() FT_GET_MACRO( OFF3 ) 280#define FT_GET_UOFF3() FT_GET_MACRO( UOFF3 ) 281#define FT_GET_LONG() FT_GET_MACRO( LONG ) 282#define FT_GET_ULONG() FT_GET_MACRO( ULONG ) 283#define FT_GET_TAG4() FT_GET_MACRO( ULONG ) 284 285#define FT_GET_SHORT_LE() FT_GET_MACRO( SHORT_LE ) 286#define FT_GET_USHORT_LE() FT_GET_MACRO( USHORT_LE ) 287#define FT_GET_LONG_LE() FT_GET_MACRO( LONG_LE ) 288#define FT_GET_ULONG_LE() FT_GET_MACRO( ULONG_LE ) 289 290#else 291#define FT_GET_MACRO( func, type ) ( (type)func( stream ) ) 292 293#define FT_GET_CHAR() FT_GET_MACRO( FT_Stream_GetChar, FT_Char ) 294#define FT_GET_BYTE() FT_GET_MACRO( FT_Stream_GetChar, FT_Byte ) 295#define FT_GET_SHORT() FT_GET_MACRO( FT_Stream_GetShort, FT_Short ) 296#define FT_GET_USHORT() FT_GET_MACRO( FT_Stream_GetShort, FT_UShort ) 297#define FT_GET_OFF3() FT_GET_MACRO( FT_Stream_GetOffset, FT_Long ) 298#define FT_GET_UOFF3() FT_GET_MACRO( FT_Stream_GetOffset, FT_ULong ) 299#define FT_GET_LONG() FT_GET_MACRO( FT_Stream_GetLong, FT_Long ) 300#define FT_GET_ULONG() FT_GET_MACRO( FT_Stream_GetLong, FT_ULong ) 301#define FT_GET_TAG4() FT_GET_MACRO( FT_Stream_GetLong, FT_ULong ) 302 303#define FT_GET_SHORT_LE() FT_GET_MACRO( FT_Stream_GetShortLE, FT_Short ) 304#define FT_GET_USHORT_LE() FT_GET_MACRO( FT_Stream_GetShortLE, FT_UShort ) 305#define FT_GET_LONG_LE() FT_GET_MACRO( FT_Stream_GetLongLE, FT_Long ) 306#define FT_GET_ULONG_LE() FT_GET_MACRO( FT_Stream_GetLongLE, FT_ULong ) 307#endif 308 309#define FT_READ_MACRO( func, type, var ) \ 310 ( var = (type)func( stream, &error ), \ 311 error != FT_Err_Ok ) 312 313#define FT_READ_BYTE( var ) FT_READ_MACRO( FT_Stream_ReadChar, FT_Byte, var ) 314#define FT_READ_CHAR( var ) FT_READ_MACRO( FT_Stream_ReadChar, FT_Char, var ) 315#define FT_READ_SHORT( var ) FT_READ_MACRO( FT_Stream_ReadShort, FT_Short, var ) 316#define FT_READ_USHORT( var ) FT_READ_MACRO( FT_Stream_ReadShort, FT_UShort, var ) 317#define FT_READ_OFF3( var ) FT_READ_MACRO( FT_Stream_ReadOffset, FT_Long, var ) 318#define FT_READ_UOFF3( var ) FT_READ_MACRO( FT_Stream_ReadOffset, FT_ULong, var ) 319#define FT_READ_LONG( var ) FT_READ_MACRO( FT_Stream_ReadLong, FT_Long, var ) 320#define FT_READ_ULONG( var ) FT_READ_MACRO( FT_Stream_ReadLong, FT_ULong, var ) 321 322#define FT_READ_SHORT_LE( var ) FT_READ_MACRO( FT_Stream_ReadShortLE, FT_Short, var ) 323#define FT_READ_USHORT_LE( var ) FT_READ_MACRO( FT_Stream_ReadShortLE, FT_UShort, var ) 324#define FT_READ_LONG_LE( var ) FT_READ_MACRO( FT_Stream_ReadLongLE, FT_Long, var ) 325#define FT_READ_ULONG_LE( var ) FT_READ_MACRO( FT_Stream_ReadLongLE, FT_ULong, var ) 326 327 328#ifndef FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM 329 330 /* initialize a stream for reading a regular system stream */ 331 FT_BASE( FT_Error ) 332 FT_Stream_Open( FT_Stream stream, 333 const char* filepathname ); 334 335#endif /* FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM */ 336 337 338 /* create a new (input) stream from an FT_Open_Args structure */ 339 FT_BASE( FT_Error ) 340 FT_Stream_New( FT_Library library, 341 const FT_Open_Args* args, 342 FT_Stream *astream ); 343 344 /* free a stream */ 345 FT_BASE( void ) 346 FT_Stream_Free( FT_Stream stream, 347 FT_Int external ); 348 349 /* initialize a stream for reading in-memory data */ 350 FT_BASE( void ) 351 FT_Stream_OpenMemory( FT_Stream stream, 352 const FT_Byte* base, 353 FT_ULong size ); 354 355 /* close a stream (does not destroy the stream structure) */ 356 FT_BASE( void ) 357 FT_Stream_Close( FT_Stream stream ); 358 359 360 /* seek within a stream. position is relative to start of stream */ 361 FT_BASE( FT_Error ) 362 FT_Stream_Seek( FT_Stream stream, 363 FT_ULong pos ); 364 365 /* skip bytes in a stream */ 366 FT_BASE( FT_Error ) 367 FT_Stream_Skip( FT_Stream stream, 368 FT_Long distance ); 369 370 /* return current stream position */ 371 FT_BASE( FT_Long ) 372 FT_Stream_Pos( FT_Stream stream ); 373 374 /* read bytes from a stream into a user-allocated buffer, returns an */ 375 /* error if not all bytes could be read. */ 376 FT_BASE( FT_Error ) 377 FT_Stream_Read( FT_Stream stream, 378 FT_Byte* buffer, 379 FT_ULong count ); 380 381 /* read bytes from a stream at a given position */ 382 FT_BASE( FT_Error ) 383 FT_Stream_ReadAt( FT_Stream stream, 384 FT_ULong pos, 385 FT_Byte* buffer, 386 FT_ULong count ); 387 388 /* try to read bytes at the end of a stream; return number of bytes */ 389 /* really available */ 390 FT_BASE( FT_ULong ) 391 FT_Stream_TryRead( FT_Stream stream, 392 FT_Byte* buffer, 393 FT_ULong count ); 394 395 /* Enter a frame of `count' consecutive bytes in a stream. Returns an */ 396 /* error if the frame could not be read/accessed. The caller can use */ 397 /* the FT_Stream_Get_XXX functions to retrieve frame data without */ 398 /* error checks. */ 399 /* */ 400 /* You must _always_ call FT_Stream_ExitFrame() once you have entered */ 401 /* a stream frame! */ 402 /* */ 403 FT_BASE( FT_Error ) 404 FT_Stream_EnterFrame( FT_Stream stream, 405 FT_ULong count ); 406 407 /* exit a stream frame */ 408 FT_BASE( void ) 409 FT_Stream_ExitFrame( FT_Stream stream ); 410 411 /* Extract a stream frame. If the stream is disk-based, a heap block */ 412 /* is allocated and the frame bytes are read into it. If the stream */ 413 /* is memory-based, this function simply set a pointer to the data. */ 414 /* */ 415 /* Useful to optimize access to memory-based streams transparently. */ 416 /* */ 417 /* All extracted frames must be `freed' with a call to the function */ 418 /* FT_Stream_ReleaseFrame(). */ 419 /* */ 420 FT_BASE( FT_Error ) 421 FT_Stream_ExtractFrame( FT_Stream stream, 422 FT_ULong count, 423 FT_Byte** pbytes ); 424 425 /* release an extract frame (see FT_Stream_ExtractFrame) */ 426 FT_BASE( void ) 427 FT_Stream_ReleaseFrame( FT_Stream stream, 428 FT_Byte** pbytes ); 429 430 /* read a byte from an entered frame */ 431 FT_BASE( FT_Char ) 432 FT_Stream_GetChar( FT_Stream stream ); 433 434 /* read a 16-bit big-endian integer from an entered frame */ 435 FT_BASE( FT_Short ) 436 FT_Stream_GetShort( FT_Stream stream ); 437 438 /* read a 24-bit big-endian integer from an entered frame */ 439 FT_BASE( FT_Long ) 440 FT_Stream_GetOffset( FT_Stream stream ); 441 442 /* read a 32-bit big-endian integer from an entered frame */ 443 FT_BASE( FT_Long ) 444 FT_Stream_GetLong( FT_Stream stream ); 445 446 /* read a 16-bit little-endian integer from an entered frame */ 447 FT_BASE( FT_Short ) 448 FT_Stream_GetShortLE( FT_Stream stream ); 449 450 /* read a 32-bit little-endian integer from an entered frame */ 451 FT_BASE( FT_Long ) 452 FT_Stream_GetLongLE( FT_Stream stream ); 453 454 455 /* read a byte from a stream */ 456 FT_BASE( FT_Char ) 457 FT_Stream_ReadChar( FT_Stream stream, 458 FT_Error* error ); 459 460 /* read a 16-bit big-endian integer from a stream */ 461 FT_BASE( FT_Short ) 462 FT_Stream_ReadShort( FT_Stream stream, 463 FT_Error* error ); 464 465 /* read a 24-bit big-endian integer from a stream */ 466 FT_BASE( FT_Long ) 467 FT_Stream_ReadOffset( FT_Stream stream, 468 FT_Error* error ); 469 470 /* read a 32-bit big-endian integer from a stream */ 471 FT_BASE( FT_Long ) 472 FT_Stream_ReadLong( FT_Stream stream, 473 FT_Error* error ); 474 475 /* read a 16-bit little-endian integer from a stream */ 476 FT_BASE( FT_Short ) 477 FT_Stream_ReadShortLE( FT_Stream stream, 478 FT_Error* error ); 479 480 /* read a 32-bit little-endian integer from a stream */ 481 FT_BASE( FT_Long ) 482 FT_Stream_ReadLongLE( FT_Stream stream, 483 FT_Error* error ); 484 485 /* Read a structure from a stream. The structure must be described */ 486 /* by an array of FT_Frame_Field records. */ 487 FT_BASE( FT_Error ) 488 FT_Stream_ReadFields( FT_Stream stream, 489 const FT_Frame_Field* fields, 490 void* structure ); 491 492 493#define FT_STREAM_POS() \ 494 FT_Stream_Pos( stream ) 495 496#define FT_STREAM_SEEK( position ) \ 497 FT_SET_ERROR( FT_Stream_Seek( stream, position ) ) 498 499#define FT_STREAM_SKIP( distance ) \ 500 FT_SET_ERROR( FT_Stream_Skip( stream, distance ) ) 501 502#define FT_STREAM_READ( buffer, count ) \ 503 FT_SET_ERROR( FT_Stream_Read( stream, \ 504 (FT_Byte*)buffer, \ 505 count ) ) 506 507#define FT_STREAM_READ_AT( position, buffer, count ) \ 508 FT_SET_ERROR( FT_Stream_ReadAt( stream, \ 509 position, \ 510 (FT_Byte*)buffer, \ 511 count ) ) 512 513#define FT_STREAM_READ_FIELDS( fields, object ) \ 514 FT_SET_ERROR( FT_Stream_ReadFields( stream, fields, object ) ) 515 516 517#define FT_FRAME_ENTER( size ) \ 518 FT_SET_ERROR( \ 519 FT_DEBUG_INNER( FT_Stream_EnterFrame( stream, size ) ) ) 520 521#define FT_FRAME_EXIT() \ 522 FT_DEBUG_INNER( FT_Stream_ExitFrame( stream ) ) 523 524#define FT_FRAME_EXTRACT( size, bytes ) \ 525 FT_SET_ERROR( \ 526 FT_DEBUG_INNER( FT_Stream_ExtractFrame( stream, size, \ 527 (FT_Byte**)&(bytes) ) ) ) 528 529#define FT_FRAME_RELEASE( bytes ) \ 530 FT_DEBUG_INNER( FT_Stream_ReleaseFrame( stream, \ 531 (FT_Byte**)&(bytes) ) ) 532 533 534FT_END_HEADER 535 536#endif /* __FTSTREAM_H__ */ 537 538 539/* END */ 540