2 * ALURE OpenAL utility library
3 * Copyright (c) 2009 by Chris Robinson.
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to
7 * deal in the Software without restriction, including without limitation the
8 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
9 * sell copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
31 #include <sys/types.h>
39 MemStreamBuf::int_type MemStreamBuf::underflow()
43 char_type *data = (char_type*)memInfo.Data;
44 setg(data, data + memInfo.Pos, data + memInfo.Length);
45 memInfo.Pos = memInfo.Length;
48 return traits_type::eof();
49 return (*gptr())&0xFF;
52 MemStreamBuf::pos_type MemStreamBuf::seekoff(off_type offset, std::ios_base::seekdir whence, std::ios_base::openmode mode)
54 if((mode&std::ios_base::out))
55 return traits_type::eof();
60 case std::ios_base::beg:
61 pos = pos_type(offset);
63 case std::ios_base::cur:
64 pos = pos_type(memInfo.Pos) - pos_type(egptr()-gptr());
67 case std::ios_base::end:
68 pos = memInfo.Length + pos_type(offset);
71 return traits_type::eof();
74 return seekpos(pos, mode);
77 MemStreamBuf::pos_type MemStreamBuf::seekpos(pos_type pos, std::ios_base::openmode mode)
79 if((mode&std::ios_base::out))
80 return traits_type::eof();
82 if(pos < 0 || pos > pos_type(memInfo.Length) || pos != pos_type(size_t(pos)))
83 return traits_type::eof();
91 int FileStreamBuf::underflow()
93 if(usrFile && gptr() == egptr())
95 ALsizei amt = fio.read(usrFile, reinterpret_cast<ALubyte*>(&buffer[0]), sizeof(buffer));
96 if(amt >= 0) setg(buffer, buffer, buffer+amt);
99 return traits_type::eof();
100 return (*gptr())&0xFF;
103 FileStreamBuf::pos_type FileStreamBuf::seekoff(off_type offset, std::ios_base::seekdir whence, std::ios_base::openmode mode)
105 if(!usrFile || (mode&std::ios_base::out))
106 return traits_type::eof();
108 pos_type pos = traits_type::eof();
111 case std::ios_base::beg:
112 if(offset == off_type(alureInt64(offset)))
113 pos = pos_type(fio.seek(usrFile, offset, SEEK_SET));
116 case std::ios_base::cur:
117 offset -= off_type(egptr()-gptr());
118 if(offset == off_type(alureInt64(offset)))
119 pos = pos_type(fio.seek(usrFile, offset, SEEK_CUR));
122 case std::ios_base::end:
123 if(offset == off_type(alureInt64(offset)))
124 pos = pos_type(fio.seek(usrFile, offset, SEEK_END));
135 FileStreamBuf::pos_type FileStreamBuf::seekpos(pos_type pos, std::ios_base::openmode mode)
137 if(pos != pos_type(off_type(pos)))
138 return traits_type::eof();
139 return seekoff(off_type(pos), std::ios_base::beg, mode);
143 static void *open_wrap(const char *filename, ALuint mode)
148 return fopen(filename, "rb");
151 static void close_wrap(void *user_data)
153 FILE *f = (FILE*)user_data;
157 static ALsizei read_wrap(void *user_data, ALubyte *buf, ALuint bytes)
159 FILE *f = (FILE*)user_data;
160 return fread(buf, 1, bytes, f);
163 static ALsizei write_wrap(void *user_data, const ALubyte *buf, ALuint bytes)
165 FILE *f = (FILE*)user_data;
166 return fwrite(buf, 1, bytes, f);
169 static alureInt64 seek_wrap(void *user_data, alureInt64 offset, int whence)
171 FILE *f = (FILE*)user_data;
173 if(offset != (off_t)offset || fseeko(f, offset, whence) != 0)
176 #elif defined(HAVE__FSEEKI64)
177 if(_fseeki64(f, offset, whence) != 0)
181 if(offset != (long)offset || fseek(f, offset, whence) != 0)
194 bool UsingSTDIO = true;
198 /* Function: alureSetIOCallbacks
200 * Provides callbacks for alternative methods to handle file I/O. Passing NULL
201 * for all callbacks is a valid way to revert to normal I/O, otherwise they
202 * must all be specified. Changing the callbacks will not affect open files
203 * (they will continue using the callbacks that were set at the time they were
207 * open - This callback is called to open the named file. The given mode is the
208 * access rights the open file should have. Currently, this will always
209 * be 0 for read-only (applications should check this to make sure, as
210 * future versions may pass other values for other modes). Upon success,
211 * a non-NULL handle must be returned which will be used as a unique
212 * identifier for the file.
213 * close - This callback is called to close an opened file handle. The handle
214 * will no longer be used after this function.
215 * read - This callback is called when data needs to be read from the given
216 * handle. Up to the given number of bytes should be copied into 'buf'
217 * and the number of bytes actually copied should be returned. Returning
218 * 0 means the end of the file has been reached (so non-blocking I/O
219 * methods should ensure at least 1 byte gets read), and negative
220 * indicates an error.
221 * write - This callback is called when data needs to be written to the given
222 * handle. Up to the given number of bytes should be copied from 'buf'
223 * and the number of bytes actually copied should be returned. A return
224 * value of 0 means no more data can be written (so non-blocking I/O
225 * methods should ensure at least 1 byte gets written), and negative
226 * indicates an error.
227 * seek - This callback is called to reposition the offset of the file handle.
228 * The given offset is interpreted according to 'whence', which may be
229 * SEEK_SET (absolute position from the start of the file), SEEK_CUR
230 * (relative position from the current offset), or SEEK_END (absolute
231 * position from the end of the file), as defined by standard C. The new
232 * offset from the beginning of the file should be returned. If the file
233 * cannot seek, such as when using a FIFO, -1 should be returned.
238 * *Version Added*: 1.1
240 ALURE_API ALboolean ALURE_APIENTRY alureSetIOCallbacks(
241 void* (*open)(const char *filename, ALuint mode),
242 void (*close)(void *handle),
243 ALsizei (*read)(void *handle, ALubyte *buf, ALuint bytes),
244 ALsizei (*write)(void *handle, const ALubyte *buf, ALuint bytes),
245 alureInt64 (*seek)(void *handle, alureInt64 offset, int whence))
247 if(open && close && read && write && seek)
258 if(!open && !close && !read && !write && !seek)
260 Funcs.open = open_wrap;
261 Funcs.close = close_wrap;
262 Funcs.read = read_wrap;
263 Funcs.write = write_wrap;
264 Funcs.seek = seek_wrap;
269 SetError("Missing callback functions");