| 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() { } |