|
5269
|
1 /* |
|
|
2 |
|
7017
|
3 Copyright (C) 2005, 2007 Ludwig Schwardt, Kevin Ruland |
|
5269
|
4 |
|
|
5 This file is part of Octave. |
|
|
6 |
|
|
7 Octave is free software; you can redistribute it and/or modify it |
|
|
8 under the terms of the GNU General Public License as published by the |
|
7016
|
9 Free Software Foundation; either version 3 of the License, or (at your |
|
|
10 option) any later version. |
|
5269
|
11 |
|
|
12 Octave is distributed in the hope that it will be useful, but WITHOUT |
|
|
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
|
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
|
15 for more details. |
|
|
16 |
|
|
17 You should have received a copy of the GNU General Public License |
|
7016
|
18 along with Octave; see the file COPYING. If not, see |
|
|
19 <http://www.gnu.org/licenses/>. |
|
5269
|
20 |
|
|
21 */ |
|
|
22 |
|
|
23 /* |
|
|
24 |
|
|
25 This file is adapted from the zlib 1.2.2 contrib/iostream3 code, |
|
|
26 written by |
|
|
27 |
|
|
28 Ludwig Schwardt <schwardt@sun.ac.za> |
|
|
29 original version by Kevin Ruland <kevin@rodin.wustl.edu> |
|
|
30 |
|
|
31 */ |
|
|
32 |
|
|
33 #ifndef ZFSTREAM_H |
|
|
34 #define ZFSTREAM_H |
|
|
35 |
|
|
36 #ifdef HAVE_ZLIB |
|
|
37 |
|
|
38 #include <istream> // not iostream, since we don't need cin/cout |
|
|
39 #include <ostream> |
|
|
40 #include "zlib.h" |
|
|
41 |
|
|
42 /*****************************************************************************/ |
|
|
43 |
|
|
44 /** |
|
|
45 * @brief Gzipped file stream buffer class. |
|
|
46 * |
|
|
47 * This class implements basic_filebuf for gzipped files. It doesn't yet support |
|
|
48 * seeking (allowed by zlib but slow/limited), putback and read/write access |
|
|
49 * (tricky). Otherwise, it attempts to be a drop-in replacement for the standard |
|
|
50 * file streambuf. |
|
|
51 */ |
|
|
52 class gzfilebuf : public std::streambuf |
|
|
53 { |
|
|
54 public: |
|
|
55 // Default constructor. |
|
|
56 gzfilebuf(); |
|
|
57 |
|
|
58 // Destructor. |
|
|
59 virtual |
|
|
60 ~gzfilebuf(); |
|
|
61 |
|
|
62 /** |
|
|
63 * @brief Set compression level and strategy on the fly. |
|
|
64 * @param comp_level Compression level (see zlib.h for allowed values) |
|
|
65 * @param comp_strategy Compression strategy (see zlib.h for allowed values) |
|
|
66 * @return Z_OK on success, Z_STREAM_ERROR otherwise. |
|
|
67 * |
|
|
68 * Unfortunately, these parameters cannot be modified separately, as the |
|
|
69 * previous zfstream version assumed. Since the strategy is seldom changed, |
|
|
70 * it can default and setcompression(level) then becomes like the old |
|
|
71 * setcompressionlevel(level). |
|
|
72 */ |
|
|
73 int |
|
|
74 setcompression(int comp_level, |
|
|
75 int comp_strategy = Z_DEFAULT_STRATEGY); |
|
|
76 |
|
|
77 /** |
|
|
78 * @brief Check if file is open. |
|
|
79 * @return True if file is open. |
|
|
80 */ |
|
|
81 bool |
|
7520
|
82 is_open() const { return (file != 0); } |
|
5269
|
83 |
|
|
84 /** |
|
|
85 * @brief Open gzipped file. |
|
|
86 * @param name File name. |
|
|
87 * @param mode Open mode flags. |
|
|
88 * @return @c this on success, NULL on failure. |
|
|
89 */ |
|
|
90 gzfilebuf* |
|
|
91 open(const char* name, |
|
|
92 std::ios_base::openmode mode); |
|
|
93 |
|
|
94 /** |
|
|
95 * @brief Attach to already open gzipped file. |
|
|
96 * @param fd File descriptor. |
|
|
97 * @param mode Open mode flags. |
|
|
98 * @return @c this on success, NULL on failure. |
|
|
99 */ |
|
|
100 gzfilebuf* |
|
|
101 attach(int fd, |
|
|
102 std::ios_base::openmode mode); |
|
|
103 |
|
|
104 /** |
|
|
105 * @brief Close gzipped file. |
|
|
106 * @return @c this on success, NULL on failure. |
|
|
107 */ |
|
|
108 gzfilebuf* |
|
|
109 close(); |
|
|
110 |
|
|
111 protected: |
|
|
112 /** |
|
|
113 * @brief Convert ios open mode int to mode string used by zlib. |
|
|
114 * @return True if valid mode flag combination. |
|
|
115 */ |
|
|
116 bool |
|
|
117 open_mode(std::ios_base::openmode mode, |
|
|
118 char* c_mode) const; |
|
|
119 |
|
|
120 /** |
|
|
121 * @brief Number of characters available in stream buffer. |
|
|
122 * @return Number of characters. |
|
|
123 * |
|
|
124 * This indicates number of characters in get area of stream buffer. |
|
|
125 * These characters can be read without accessing the gzipped file. |
|
|
126 */ |
|
|
127 virtual std::streamsize |
|
|
128 showmanyc(); |
|
|
129 |
|
|
130 /** |
|
|
131 * @brief Fill get area from gzipped file. |
|
|
132 * @return First character in get area on success, EOF on error. |
|
|
133 * |
|
|
134 * This actually reads characters from gzipped file to stream |
|
|
135 * buffer. Always buffered. |
|
|
136 */ |
|
|
137 virtual int_type |
|
|
138 underflow(); |
|
|
139 |
|
|
140 /** |
|
|
141 * @brief Write put area to gzipped file. |
|
|
142 * @param c Extra character to add to buffer contents. |
|
|
143 * @return Non-EOF on success, EOF on error. |
|
|
144 * |
|
|
145 * This actually writes characters in stream buffer to |
|
|
146 * gzipped file. With unbuffered output this is done one |
|
|
147 * character at a time. |
|
|
148 */ |
|
|
149 virtual int_type |
|
|
150 overflow(int_type c = traits_type::eof()); |
|
|
151 |
|
|
152 /** |
|
|
153 * @brief Installs external stream buffer. |
|
|
154 * @param p Pointer to char buffer. |
|
|
155 * @param n Size of external buffer. |
|
|
156 * @return @c this on success, NULL on failure. |
|
|
157 * |
|
|
158 * Call setbuf(0,0) to enable unbuffered output. |
|
|
159 */ |
|
|
160 virtual std::streambuf* |
|
|
161 setbuf(char_type* p, |
|
|
162 std::streamsize n); |
|
|
163 |
|
|
164 /** |
|
|
165 * @brief Flush stream buffer to file. |
|
|
166 * @return 0 on success, -1 on error. |
|
|
167 * |
|
|
168 * This calls underflow(EOF) to do the job. |
|
|
169 */ |
|
|
170 virtual int |
|
|
171 sync(); |
|
|
172 |
|
|
173 /** |
|
|
174 * @brief Alters the stream positions. |
|
|
175 * |
|
|
176 * Each derived class provides its own appropriate behavior. |
|
|
177 */ |
|
|
178 virtual pos_type |
|
|
179 seekoff(off_type off, std::ios_base::seekdir way, |
|
|
180 std::ios_base::openmode mode = |
|
|
181 std::ios_base::in|std::ios_base::out); |
|
|
182 |
|
|
183 /** |
|
|
184 * @brief Alters the stream positions. |
|
|
185 * |
|
|
186 * Each derived class provides its own appropriate behavior. |
|
|
187 */ |
|
|
188 virtual pos_type |
|
|
189 seekpos(pos_type sp, std::ios_base::openmode mode = |
|
|
190 std::ios_base::in|std::ios_base::out); |
|
|
191 |
|
6777
|
192 virtual int_type |
|
|
193 pbackfail (int_type c = traits_type::eof()); |
|
|
194 |
|
5269
|
195 // |
|
|
196 // Some future enhancements |
|
|
197 // |
|
|
198 // virtual int_type uflow(); |
|
|
199 // virtual int_type pbackfail(int_type c = traits_type::eof()); |
|
|
200 |
|
|
201 private: |
|
|
202 /** |
|
|
203 * @brief Allocate internal buffer. |
|
|
204 * |
|
|
205 * This function is safe to call multiple times. It will ensure |
|
|
206 * that a proper internal buffer exists if it is required. If the |
|
|
207 * buffer already exists or is external, the buffer pointers will be |
|
|
208 * reset to their original state. |
|
|
209 */ |
|
|
210 void |
|
|
211 enable_buffer(); |
|
|
212 |
|
|
213 /** |
|
|
214 * @brief Destroy internal buffer. |
|
|
215 * |
|
|
216 * This function is safe to call multiple times. It will ensure |
|
|
217 * that the internal buffer is deallocated if it exists. In any |
|
|
218 * case, it will also reset the buffer pointers. |
|
|
219 */ |
|
|
220 void |
|
|
221 disable_buffer(); |
|
|
222 |
|
|
223 /** |
|
|
224 * Underlying file pointer. |
|
|
225 */ |
|
|
226 gzFile file; |
|
|
227 |
|
|
228 /** |
|
|
229 * Mode in which file was opened. |
|
|
230 */ |
|
|
231 std::ios_base::openmode io_mode; |
|
|
232 |
|
|
233 /** |
|
|
234 * @brief True if this object owns file descriptor. |
|
|
235 * |
|
|
236 * This makes the class responsible for closing the file |
|
|
237 * upon destruction. |
|
|
238 */ |
|
|
239 bool own_fd; |
|
|
240 |
|
|
241 /** |
|
|
242 * @brief Stream buffer. |
|
|
243 * |
|
|
244 * For simplicity this remains allocated on the free store for the |
|
|
245 * entire life span of the gzfilebuf object, unless replaced by setbuf. |
|
|
246 */ |
|
|
247 char_type* buffer; |
|
|
248 |
|
|
249 /** |
|
|
250 * @brief Stream buffer size. |
|
|
251 * |
|
|
252 * Defaults to system default buffer size (typically 8192 bytes). |
|
|
253 * Modified by setbuf. |
|
|
254 */ |
|
|
255 std::streamsize buffer_size; |
|
|
256 |
|
|
257 /** |
|
|
258 * @brief True if this object owns stream buffer. |
|
|
259 * |
|
|
260 * This makes the class responsible for deleting the buffer |
|
|
261 * upon destruction. |
|
|
262 */ |
|
|
263 bool own_buffer; |
|
|
264 }; |
|
|
265 |
|
|
266 /*****************************************************************************/ |
|
|
267 |
|
|
268 /** |
|
|
269 * @brief Gzipped file input stream class. |
|
|
270 * |
|
|
271 * This class implements ifstream for gzipped files. Seeking and putback |
|
|
272 * is not supported yet. |
|
|
273 */ |
|
|
274 class gzifstream : public std::istream |
|
|
275 { |
|
|
276 public: |
|
|
277 // Default constructor |
|
|
278 gzifstream(); |
|
|
279 |
|
|
280 /** |
|
|
281 * @brief Construct stream on gzipped file to be opened. |
|
|
282 * @param name File name. |
|
|
283 * @param mode Open mode flags (forced to contain ios::in). |
|
|
284 */ |
|
|
285 explicit |
|
|
286 gzifstream(const char* name, |
|
|
287 std::ios_base::openmode mode = std::ios_base::in); |
|
|
288 |
|
|
289 /** |
|
|
290 * @brief Construct stream on already open gzipped file. |
|
|
291 * @param fd File descriptor. |
|
|
292 * @param mode Open mode flags (forced to contain ios::in). |
|
|
293 */ |
|
|
294 explicit |
|
|
295 gzifstream(int fd, |
|
|
296 std::ios_base::openmode mode = std::ios_base::in); |
|
|
297 |
|
|
298 /** |
|
|
299 * Obtain underlying stream buffer. |
|
|
300 */ |
|
|
301 gzfilebuf* |
|
|
302 rdbuf() const |
|
|
303 { return const_cast<gzfilebuf*>(&sb); } |
|
|
304 |
|
|
305 /** |
|
|
306 * @brief Check if file is open. |
|
|
307 * @return True if file is open. |
|
|
308 */ |
|
|
309 bool |
|
|
310 is_open() { return sb.is_open(); } |
|
|
311 |
|
|
312 /** |
|
|
313 * @brief Open gzipped file. |
|
|
314 * @param name File name. |
|
|
315 * @param mode Open mode flags (forced to contain ios::in). |
|
|
316 * |
|
|
317 * Stream will be in state good() if file opens successfully; |
|
|
318 * otherwise in state fail(). This differs from the behavior of |
|
|
319 * ifstream, which never sets the state to good() and therefore |
|
|
320 * won't allow you to reuse the stream for a second file unless |
|
|
321 * you manually clear() the state. The choice is a matter of |
|
|
322 * convenience. |
|
|
323 */ |
|
|
324 void |
|
|
325 open(const char* name, |
|
|
326 std::ios_base::openmode mode = std::ios_base::in); |
|
|
327 |
|
|
328 /** |
|
|
329 * @brief Attach to already open gzipped file. |
|
|
330 * @param fd File descriptor. |
|
|
331 * @param mode Open mode flags (forced to contain ios::in). |
|
|
332 * |
|
|
333 * Stream will be in state good() if attach succeeded; otherwise |
|
|
334 * in state fail(). |
|
|
335 */ |
|
|
336 void |
|
|
337 attach(int fd, |
|
|
338 std::ios_base::openmode mode = std::ios_base::in); |
|
|
339 |
|
|
340 /** |
|
|
341 * @brief Close gzipped file. |
|
|
342 * |
|
|
343 * Stream will be in state fail() if close failed. |
|
|
344 */ |
|
|
345 void |
|
|
346 close(); |
|
|
347 |
|
|
348 private: |
|
|
349 /** |
|
|
350 * Underlying stream buffer. |
|
|
351 */ |
|
|
352 gzfilebuf sb; |
|
|
353 }; |
|
|
354 |
|
|
355 /*****************************************************************************/ |
|
|
356 |
|
|
357 /** |
|
|
358 * @brief Gzipped file output stream class. |
|
|
359 * |
|
|
360 * This class implements ofstream for gzipped files. Seeking and putback |
|
|
361 * is not supported yet. |
|
|
362 */ |
|
|
363 class gzofstream : public std::ostream |
|
|
364 { |
|
|
365 public: |
|
|
366 // Default constructor |
|
|
367 gzofstream(); |
|
|
368 |
|
|
369 /** |
|
|
370 * @brief Construct stream on gzipped file to be opened. |
|
|
371 * @param name File name. |
|
|
372 * @param mode Open mode flags (forced to contain ios::out). |
|
|
373 */ |
|
|
374 explicit |
|
|
375 gzofstream(const char* name, |
|
|
376 std::ios_base::openmode mode = std::ios_base::out); |
|
|
377 |
|
|
378 /** |
|
|
379 * @brief Construct stream on already open gzipped file. |
|
|
380 * @param fd File descriptor. |
|
|
381 * @param mode Open mode flags (forced to contain ios::out). |
|
|
382 */ |
|
|
383 explicit |
|
|
384 gzofstream(int fd, |
|
|
385 std::ios_base::openmode mode = std::ios_base::out); |
|
|
386 |
|
|
387 /** |
|
|
388 * Obtain underlying stream buffer. |
|
|
389 */ |
|
|
390 gzfilebuf* |
|
|
391 rdbuf() const |
|
|
392 { return const_cast<gzfilebuf*>(&sb); } |
|
|
393 |
|
|
394 /** |
|
|
395 * @brief Check if file is open. |
|
|
396 * @return True if file is open. |
|
|
397 */ |
|
|
398 bool |
|
|
399 is_open() { return sb.is_open(); } |
|
|
400 |
|
|
401 /** |
|
|
402 * @brief Open gzipped file. |
|
|
403 * @param name File name. |
|
|
404 * @param mode Open mode flags (forced to contain ios::out). |
|
|
405 * |
|
|
406 * Stream will be in state good() if file opens successfully; |
|
|
407 * otherwise in state fail(). This differs from the behavior of |
|
|
408 * ofstream, which never sets the state to good() and therefore |
|
|
409 * won't allow you to reuse the stream for a second file unless |
|
|
410 * you manually clear() the state. The choice is a matter of |
|
|
411 * convenience. |
|
|
412 */ |
|
|
413 void |
|
|
414 open(const char* name, |
|
|
415 std::ios_base::openmode mode = std::ios_base::out); |
|
|
416 |
|
|
417 /** |
|
|
418 * @brief Attach to already open gzipped file. |
|
|
419 * @param fd File descriptor. |
|
|
420 * @param mode Open mode flags (forced to contain ios::out). |
|
|
421 * |
|
|
422 * Stream will be in state good() if attach succeeded; otherwise |
|
|
423 * in state fail(). |
|
|
424 */ |
|
|
425 void |
|
|
426 attach(int fd, |
|
|
427 std::ios_base::openmode mode = std::ios_base::out); |
|
|
428 |
|
|
429 /** |
|
|
430 * @brief Close gzipped file. |
|
|
431 * |
|
|
432 * Stream will be in state fail() if close failed. |
|
|
433 */ |
|
|
434 void |
|
|
435 close(); |
|
|
436 |
|
|
437 private: |
|
|
438 /** |
|
|
439 * Underlying stream buffer. |
|
|
440 */ |
|
|
441 gzfilebuf sb; |
|
|
442 }; |
|
|
443 |
|
|
444 /*****************************************************************************/ |
|
|
445 |
|
|
446 /** |
|
|
447 * @brief Gzipped file output stream manipulator class. |
|
|
448 * |
|
|
449 * This class defines a two-argument manipulator for gzofstream. It is used |
|
|
450 * as base for the setcompression(int,int) manipulator. |
|
|
451 */ |
|
|
452 template<typename T1, typename T2> |
|
|
453 class gzomanip2 |
|
|
454 { |
|
|
455 public: |
|
|
456 // Allows insertor to peek at internals |
|
|
457 template <typename Ta, typename Tb> |
|
|
458 friend gzofstream& |
|
|
459 operator<<(gzofstream&, |
|
|
460 const gzomanip2<Ta,Tb>&); |
|
|
461 |
|
|
462 // Constructor |
|
|
463 gzomanip2(gzofstream& (*f)(gzofstream&, T1, T2), |
|
|
464 T1 v1, |
|
|
465 T2 v2); |
|
|
466 private: |
|
|
467 // Underlying manipulator function |
|
|
468 gzofstream& |
|
|
469 (*func)(gzofstream&, T1, T2); |
|
|
470 |
|
|
471 // Arguments for manipulator function |
|
|
472 T1 val1; |
|
|
473 T2 val2; |
|
|
474 }; |
|
|
475 |
|
|
476 /*****************************************************************************/ |
|
|
477 |
|
|
478 // Manipulator function thunks through to stream buffer |
|
|
479 inline gzofstream& |
|
|
480 setcompression(gzofstream &gzs, int l, int s = Z_DEFAULT_STRATEGY) |
|
|
481 { |
|
|
482 (gzs.rdbuf())->setcompression(l, s); |
|
|
483 return gzs; |
|
|
484 } |
|
|
485 |
|
|
486 // Manipulator constructor stores arguments |
|
|
487 template<typename T1, typename T2> |
|
|
488 inline |
|
|
489 gzomanip2<T1,T2>::gzomanip2(gzofstream &(*f)(gzofstream &, T1, T2), |
|
|
490 T1 v1, |
|
|
491 T2 v2) |
|
|
492 : func(f), val1(v1), val2(v2) |
|
|
493 { } |
|
|
494 |
|
|
495 // Insertor applies underlying manipulator function to stream |
|
|
496 template<typename T1, typename T2> |
|
|
497 inline gzofstream& |
|
|
498 operator<<(gzofstream& s, const gzomanip2<T1,T2>& m) |
|
|
499 { return (*m.func)(s, m.val1, m.val2); } |
|
|
500 |
|
|
501 // Insert this onto stream to simplify setting of compression level |
|
|
502 inline gzomanip2<int,int> |
|
|
503 setcompression(int l, int s = Z_DEFAULT_STRATEGY) |
|
|
504 { return gzomanip2<int,int>(&setcompression, l, s); } |
|
|
505 |
|
|
506 #endif // HAVE_ZLIB |
|
|
507 |
|
|
508 #endif // ZFSTREAM_H |
|
|
509 |
|
|
510 /* |
|
|
511 ;;; Local Variables: *** |
|
|
512 ;;; mode: C++ *** |
|
|
513 ;;; End: *** |
|
|
514 */ |
|
|
515 |
