9e052883 |
1 | |
2 | #include "zfstream.h" |
3 | |
4 | gzfilebuf::gzfilebuf() : |
5 | file(NULL), |
6 | mode(0), |
7 | own_file_descriptor(0) |
8 | { } |
9 | |
10 | gzfilebuf::~gzfilebuf() { |
11 | |
12 | sync(); |
13 | if ( own_file_descriptor ) |
14 | close(); |
15 | |
16 | } |
17 | |
18 | gzfilebuf *gzfilebuf::open( const char *name, |
19 | int io_mode ) { |
20 | |
21 | if ( is_open() ) |
22 | return NULL; |
23 | |
24 | char char_mode[10]; |
25 | char *p = char_mode; |
26 | |
27 | if ( io_mode & ios::in ) { |
28 | mode = ios::in; |
29 | *p++ = 'r'; |
30 | } else if ( io_mode & ios::app ) { |
31 | mode = ios::app; |
32 | *p++ = 'a'; |
33 | } else { |
34 | mode = ios::out; |
35 | *p++ = 'w'; |
36 | } |
37 | |
38 | if ( io_mode & ios::binary ) { |
39 | mode |= ios::binary; |
40 | *p++ = 'b'; |
41 | } |
42 | |
43 | // Hard code the compression level |
44 | if ( io_mode & (ios::out|ios::app )) { |
45 | *p++ = '9'; |
46 | } |
47 | |
48 | // Put the end-of-string indicator |
49 | *p = '\0'; |
50 | |
51 | if ( (file = gzopen(name, char_mode)) == NULL ) |
52 | return NULL; |
53 | |
54 | own_file_descriptor = 1; |
55 | |
56 | return this; |
57 | |
58 | } |
59 | |
60 | gzfilebuf *gzfilebuf::attach( int file_descriptor, |
61 | int io_mode ) { |
62 | |
63 | if ( is_open() ) |
64 | return NULL; |
65 | |
66 | char char_mode[10]; |
67 | char *p = char_mode; |
68 | |
69 | if ( io_mode & ios::in ) { |
70 | mode = ios::in; |
71 | *p++ = 'r'; |
72 | } else if ( io_mode & ios::app ) { |
73 | mode = ios::app; |
74 | *p++ = 'a'; |
75 | } else { |
76 | mode = ios::out; |
77 | *p++ = 'w'; |
78 | } |
79 | |
80 | if ( io_mode & ios::binary ) { |
81 | mode |= ios::binary; |
82 | *p++ = 'b'; |
83 | } |
84 | |
85 | // Hard code the compression level |
86 | if ( io_mode & (ios::out|ios::app )) { |
87 | *p++ = '9'; |
88 | } |
89 | |
90 | // Put the end-of-string indicator |
91 | *p = '\0'; |
92 | |
93 | if ( (file = gzdopen(file_descriptor, char_mode)) == NULL ) |
94 | return NULL; |
95 | |
96 | own_file_descriptor = 0; |
97 | |
98 | return this; |
99 | |
100 | } |
101 | |
102 | gzfilebuf *gzfilebuf::close() { |
103 | |
104 | if ( is_open() ) { |
105 | |
106 | sync(); |
107 | gzclose( file ); |
108 | file = NULL; |
109 | |
110 | } |
111 | |
112 | return this; |
113 | |
114 | } |
115 | |
116 | int gzfilebuf::setcompressionlevel( int comp_level ) { |
117 | |
118 | return gzsetparams(file, comp_level, -2); |
119 | |
120 | } |
121 | |
122 | int gzfilebuf::setcompressionstrategy( int comp_strategy ) { |
123 | |
124 | return gzsetparams(file, -2, comp_strategy); |
125 | |
126 | } |
127 | |
128 | |
129 | streampos gzfilebuf::seekoff( streamoff off, ios::seek_dir dir, int which ) { |
130 | |
131 | return streampos(EOF); |
132 | |
133 | } |
134 | |
135 | int gzfilebuf::underflow() { |
136 | |
137 | // If the file hasn't been opened for reading, error. |
138 | if ( !is_open() || !(mode & ios::in) ) |
139 | return EOF; |
140 | |
141 | // if a buffer doesn't exists, allocate one. |
142 | if ( !base() ) { |
143 | |
144 | if ( (allocate()) == EOF ) |
145 | return EOF; |
146 | setp(0,0); |
147 | |
148 | } else { |
149 | |
150 | if ( in_avail() ) |
151 | return (unsigned char) *gptr(); |
152 | |
153 | if ( out_waiting() ) { |
154 | if ( flushbuf() == EOF ) |
155 | return EOF; |
156 | } |
157 | |
158 | } |
159 | |
160 | // Attempt to fill the buffer. |
161 | |
162 | int result = fillbuf(); |
163 | if ( result == EOF ) { |
164 | // disable get area |
165 | setg(0,0,0); |
166 | return EOF; |
167 | } |
168 | |
169 | return (unsigned char) *gptr(); |
170 | |
171 | } |
172 | |
173 | int gzfilebuf::overflow( int c ) { |
174 | |
175 | if ( !is_open() || !(mode & ios::out) ) |
176 | return EOF; |
177 | |
178 | if ( !base() ) { |
179 | if ( allocate() == EOF ) |
180 | return EOF; |
181 | setg(0,0,0); |
182 | } else { |
183 | if (in_avail()) { |
184 | return EOF; |
185 | } |
186 | if (out_waiting()) { |
187 | if (flushbuf() == EOF) |
188 | return EOF; |
189 | } |
190 | } |
191 | |
192 | int bl = blen(); |
193 | setp( base(), base() + bl); |
194 | |
195 | if ( c != EOF ) { |
196 | |
197 | *pptr() = c; |
198 | pbump(1); |
199 | |
200 | } |
201 | |
202 | return 0; |
203 | |
204 | } |
205 | |
206 | int gzfilebuf::sync() { |
207 | |
208 | if ( !is_open() ) |
209 | return EOF; |
210 | |
211 | if ( out_waiting() ) |
212 | return flushbuf(); |
213 | |
214 | return 0; |
215 | |
216 | } |
217 | |
218 | int gzfilebuf::flushbuf() { |
219 | |
220 | int n; |
221 | char *q; |
222 | |
223 | q = pbase(); |
224 | n = pptr() - q; |
225 | |
226 | if ( gzwrite( file, q, n) < n ) |
227 | return EOF; |
228 | |
229 | setp(0,0); |
230 | |
231 | return 0; |
232 | |
233 | } |
234 | |
235 | int gzfilebuf::fillbuf() { |
236 | |
237 | int required; |
238 | char *p; |
239 | |
240 | p = base(); |
241 | |
242 | required = blen(); |
243 | |
244 | int t = gzread( file, p, required ); |
245 | |
246 | if ( t <= 0) return EOF; |
247 | |
248 | setg( base(), base(), base()+t); |
249 | |
250 | return t; |
251 | |
252 | } |
253 | |
254 | gzfilestream_common::gzfilestream_common() : |
255 | ios( gzfilestream_common::rdbuf() ) |
256 | { } |
257 | |
258 | gzfilestream_common::~gzfilestream_common() |
259 | { } |
260 | |
261 | void gzfilestream_common::attach( int fd, int io_mode ) { |
262 | |
263 | if ( !buffer.attach( fd, io_mode) ) |
264 | clear( ios::failbit | ios::badbit ); |
265 | else |
266 | clear(); |
267 | |
268 | } |
269 | |
270 | void gzfilestream_common::open( const char *name, int io_mode ) { |
271 | |
272 | if ( !buffer.open( name, io_mode ) ) |
273 | clear( ios::failbit | ios::badbit ); |
274 | else |
275 | clear(); |
276 | |
277 | } |
278 | |
279 | void gzfilestream_common::close() { |
280 | |
281 | if ( !buffer.close() ) |
282 | clear( ios::failbit | ios::badbit ); |
283 | |
284 | } |
285 | |
286 | gzfilebuf *gzfilestream_common::rdbuf() |
287 | { |
288 | return &buffer; |
289 | } |
290 | |
291 | gzifstream::gzifstream() : |
292 | ios( gzfilestream_common::rdbuf() ) |
293 | { |
294 | clear( ios::badbit ); |
295 | } |
296 | |
297 | gzifstream::gzifstream( const char *name, int io_mode ) : |
298 | ios( gzfilestream_common::rdbuf() ) |
299 | { |
300 | gzfilestream_common::open( name, io_mode ); |
301 | } |
302 | |
303 | gzifstream::gzifstream( int fd, int io_mode ) : |
304 | ios( gzfilestream_common::rdbuf() ) |
305 | { |
306 | gzfilestream_common::attach( fd, io_mode ); |
307 | } |
308 | |
309 | gzifstream::~gzifstream() { } |
310 | |
311 | gzofstream::gzofstream() : |
312 | ios( gzfilestream_common::rdbuf() ) |
313 | { |
314 | clear( ios::badbit ); |
315 | } |
316 | |
317 | gzofstream::gzofstream( const char *name, int io_mode ) : |
318 | ios( gzfilestream_common::rdbuf() ) |
319 | { |
320 | gzfilestream_common::open( name, io_mode ); |
321 | } |
322 | |
323 | gzofstream::gzofstream( int fd, int io_mode ) : |
324 | ios( gzfilestream_common::rdbuf() ) |
325 | { |
326 | gzfilestream_common::attach( fd, io_mode ); |
327 | } |
328 | |
329 | gzofstream::~gzofstream() { } |