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ftsystem.c

Last change on this file was 2, checked in by jglee, 11 years ago
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File size: 13.1 KB

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1	/***************************************************************************/
2	/* */
3	/* ftsystem.c */
4	/* */
5	/* ANSI-specific FreeType low-level system interface (body). */
6	/* */
7	/* Copyright 1996-2001, 2002, 2006, 2008 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	/* */
20	/* This file contains the default interface used by FreeType to access */
21	/* low-level, i.e. memory management, i/o access as well as thread */
22	/* synchronisation. It can be replaced by user-specific routines if */
23	/* necessary. */
24	/* */
25	/*************************************************************************/
26
27
28	#include <ft2build.h>
29	#include FT_CONFIG_CONFIG_H
30	#include FT_INTERNAL_DEBUG_H
31	#include FT_INTERNAL_STREAM_H
32	#include FT_SYSTEM_H
33	#include FT_ERRORS_H
34	#include FT_TYPES_H
35
36
37	/*************************************************************************/
38	/* */
39	/* MEMORY MANAGEMENT INTERFACE */
40	/* */
41	/*************************************************************************/
42
43	/*************************************************************************/
44	/* */
45	/* It is not necessary to do any error checking for the */
46	/* allocation-related functions. This will be done by the higher level */
47	/* routines like ft_mem_alloc() or ft_mem_realloc(). */
48	/* */
49	/*************************************************************************/
50
51
52	/*************************************************************************/
53	/* */
54	/* <Function> */
55	/* ft_alloc */
56	/* */
57	/* <Description> */
58	/* The memory allocation function. */
59	/* */
60	/* <Input> */
61	/* memory :: A pointer to the memory object. */
62	/* */
63	/* size :: The requested size in bytes. */
64	/* */
65	/* <Return> */
66	/* The address of newly allocated block. */
67	/* */
68	FT_CALLBACK_DEF( void* )
69	ft_alloc( FT_Memory memory,
70	long size )
71	{
72	FT_UNUSED( memory );
73
74	return ft_smalloc( size );
75	}
76
77
78	/*************************************************************************/
79	/* */
80	/* <Function> */
81	/* ft_realloc */
82	/* */
83	/* <Description> */
84	/* The memory reallocation function. */
85	/* */
86	/* <Input> */
87	/* memory :: A pointer to the memory object. */
88	/* */
89	/* cur_size :: The current size of the allocated memory block. */
90	/* */
91	/* new_size :: The newly requested size in bytes. */
92	/* */
93	/* block :: The current address of the block in memory. */
94	/* */
95	/* <Return> */
96	/* The address of the reallocated memory block. */
97	/* */
98	FT_CALLBACK_DEF( void* )
99	ft_realloc( FT_Memory memory,
100	long cur_size,
101	long new_size,
102	void* block )
103	{
104	FT_UNUSED( memory );
105	FT_UNUSED( cur_size );
106
107	return ft_srealloc( block, new_size );
108	}
109
110
111	/*************************************************************************/
112	/* */
113	/* <Function> */
114	/* ft_free */
115	/* */
116	/* <Description> */
117	/* The memory release function. */
118	/* */
119	/* <Input> */
120	/* memory :: A pointer to the memory object. */
121	/* */
122	/* block :: The address of block in memory to be freed. */
123	/* */
124	FT_CALLBACK_DEF( void )
125	ft_free( FT_Memory memory,
126	void* block )
127	{
128	FT_UNUSED( memory );
129
130	ft_sfree( block );
131	}
132
133
134	/*************************************************************************/
135	/* */
136	/* RESOURCE MANAGEMENT INTERFACE */
137	/* */
138	/*************************************************************************/
139
140
141	/*************************************************************************/
142	/* */
143	/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
144	/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
145	/* messages during execution. */
146	/* */
147	#undef FT_COMPONENT
148	#define FT_COMPONENT trace_io
149
150	/* We use the macro STREAM_FILE for convenience to extract the */
151	/* system-specific stream handle from a given FreeType stream object */
152	#if DST_SUPPORT_FILE_SYSTEM
153	#define STREAM_FILE( stream ) ( (FT_FILE*)stream->descriptor.pointer )
154
155
156	/*************************************************************************/
157	/* */
158	/* <Function> */
159	/* ft_ansi_stream_close */
160	/* */
161	/* <Description> */
162	/* The function to close a stream. */
163	/* */
164	/* <Input> */
165	/* stream :: A pointer to the stream object. */
166	/* */
167	FT_CALLBACK_DEF( void )
168	ft_ansi_stream_close( FT_Stream stream )
169	{
170	ft_fclose( STREAM_FILE( stream ) );
171
172	stream->descriptor.pointer = NULL;
173	stream->size = 0;
174	stream->base = 0;
175	}
176
177
178	/*************************************************************************/
179	/* */
180	/* <Function> */
181	/* ft_ansi_stream_io */
182	/* */
183	/* <Description> */
184	/* The function to open a stream. */
185	/* */
186	/* <Input> */
187	/* stream :: A pointer to the stream object. */
188	/* */
189	/* offset :: The position in the data stream to start reading. */
190	/* */
191	/* buffer :: The address of buffer to store the read data. */
192	/* */
193	/* count :: The number of bytes to read from the stream. */
194	/* */
195	/* <Return> */
196	/* The number of bytes actually read. */
197	/* */
198	FT_CALLBACK_DEF( unsigned long )
199	ft_ansi_stream_io( FT_Stream stream,
200	unsigned long offset,
201	unsigned char* buffer,
202	unsigned long count )
203	{
204	FT_FILE* file;
205
206
207	file = STREAM_FILE( stream );
208
209	ft_fseek( file, offset, SEEK_SET );
210
211	return (unsigned long)ft_fread( buffer, 1, count, file );
212	}
213
214	#endif // DST_SUPPORT_FILE_SYSTEM
215	/* documentation is in ftstream.h */
216
217	FT_BASE_DEF( FT_Error )
218	FT_Stream_Open( FT_Stream stream,
219	const char* filepathname )
220	{
221	#if DST_SUPPORT_FILE_SYSTEM
222	FT_FILE* file;
223
224
225	if ( !stream )
226	return FT_Err_Invalid_Stream_Handle;
227
228	file = ft_fopen( filepathname, "rb" );
229	if ( !file )
230	{
231	FT_ERROR(( "FT_Stream_Open:" ));
232	FT_ERROR(( " could not open `%s'\n", filepathname ));
233
234	return FT_Err_Cannot_Open_Resource;
235	}
236
237	ft_fseek( file, 0, SEEK_END );
238	stream->size = ft_ftell( file );
239	ft_fseek( file, 0, SEEK_SET );
240
241	stream->descriptor.pointer = file;
242	stream->pathname.pointer = (char*)filepathname;
243	stream->pos = 0;
244
245	stream->read = ft_ansi_stream_io;
246	stream->close = ft_ansi_stream_close;
247
248	FT_TRACE1(( "FT_Stream_Open:" ));
249	FT_TRACE1(( " opened `%s' (%d bytes) successfully\n",
250	filepathname, stream->size ));
251	#endif // DST_SUPPORT_FILE_SYSTEM
252	return FT_Err_Ok;
253	}
254
255
256	#ifdef FT_DEBUG_MEMORY
257
258	extern FT_Int
259	ft_mem_debug_init( FT_Memory memory );
260
261	extern void
262	ft_mem_debug_done( FT_Memory memory );
263
264	#endif
265
266
267	/* documentation is in ftobjs.h */
268
269	FT_BASE_DEF( FT_Memory )
270	FT_New_Memory( void )
271	{
272	FT_Memory memory;
273
274
275	memory = (FT_Memory)ft_smalloc( sizeof ( *memory ) );
276	if ( memory )
277	{
278	memory->user = 0;
279	memory->alloc = ft_alloc;
280	memory->realloc = ft_realloc;
281	memory->free = ft_free;
282	#ifdef FT_DEBUG_MEMORY
283	ft_mem_debug_init( memory );
284	#endif
285	}
286
287	return memory;
288	}
289
290
291	/* documentation is in ftobjs.h */
292
293	FT_BASE_DEF( void )
294	FT_Done_Memory( FT_Memory memory )
295	{
296	#ifdef FT_DEBUG_MEMORY
297	ft_mem_debug_done( memory );
298	#endif
299	ft_sfree( memory );
300	}
301
302
303	/* END */

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source: svn/trunk/zasc/freetype-2.3.9/ftsystem.c

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