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