Mercurial > octave-nkf
annotate libinterp/corefcn/zfstream.cc @ 20654:b65888ec820e draft default tip gccjit
dmalcom gcc jit import
| author | Stefan Mahr <dac922@gmx.de> |
|---|---|
| date | Fri, 27 Feb 2015 16:59:36 +0100 |
| parents | 4197fc428c7d |
| children |
| rev | line source |
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| 5269 | 1 /* |
| 2 | |
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3 Copyright (C) 2005-2015 Ludwig Schwardt, Kevin Ruland |
| 5269 | 4 |
| 5 | |
| 6 This file is part of Octave. | |
| 7 | |
| 8 Octave is free software; you can redistribute it and/or modify it | |
| 9 under the terms of the GNU General Public License as published by the | |
| 7016 | 10 Free Software Foundation; either version 3 of the License, or (at your |
| 11 option) any later version. | |
| 5269 | 12 |
| 13 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 7016 | 19 along with Octave; see the file COPYING. If not, see |
| 20 <http://www.gnu.org/licenses/>. | |
| 5269 | 21 |
| 22 */ | |
| 23 | |
| 24 /* | |
| 25 | |
| 26 This file is adapted from the zlib 1.2.2 contrib/iostream3 code, | |
| 27 written by | |
| 28 | |
| 29 Ludwig Schwardt <schwardt@sun.ac.za> | |
| 30 original version by Kevin Ruland <kevin@rodin.wustl.edu> | |
| 31 | |
| 32 */ | |
| 33 | |
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34 #ifdef HAVE_CONFIG_H |
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35 #include <config.h> |
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36 #endif |
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37 |
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38 #include <iostream> |
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39 |
| 5269 | 40 #include "zfstream.h" |
| 41 | |
| 42 #ifdef HAVE_ZLIB | |
| 43 | |
| 44 #include <cstring> // for strcpy, strcat, strlen (mode strings) | |
| 45 #include <cstdio> // for BUFSIZ | |
| 46 | |
| 47 // Internal buffer sizes (default and "unbuffered" versions) | |
| 6783 | 48 #define STASHED_CHARACTERS 16 |
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49 #define BIGBUFSIZE (256 * 1024 + STASHED_CHARACTERS) |
| 5269 | 50 #define SMALLBUFSIZE 1 |
| 51 | |
| 52 /*****************************************************************************/ | |
| 53 | |
| 54 // Default constructor | |
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55 gzfilebuf::gzfilebuf () |
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56 : file(0), io_mode(std::ios_base::openmode(0)), own_fd(false), |
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57 buffer(0), buffer_size(BIGBUFSIZE), own_buffer(true) |
| 5269 | 58 { |
| 59 // No buffers to start with | |
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60 this->disable_buffer (); |
| 5269 | 61 } |
| 62 | |
| 63 // Destructor | |
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64 gzfilebuf::~gzfilebuf () |
| 5269 | 65 { |
| 66 // Sync output buffer and close only if responsible for file | |
| 67 // (i.e. attached streams should be left open at this stage) | |
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68 this->sync (); |
| 5269 | 69 if (own_fd) |
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70 this->close (); |
| 5269 | 71 // Make sure internal buffer is deallocated |
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72 this->disable_buffer (); |
| 5269 | 73 } |
| 74 | |
| 75 // Set compression level and strategy | |
| 76 int | |
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77 gzfilebuf::setcompression (int comp_level, int comp_strategy) |
| 5269 | 78 { |
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79 return gzsetparams (file, comp_level, comp_strategy); |
| 5269 | 80 } |
| 81 | |
| 82 // Open gzipped file | |
| 83 gzfilebuf* | |
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84 gzfilebuf::open (const char *name, std::ios_base::openmode mode) |
| 5269 | 85 { |
| 86 // Fail if file already open | |
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87 if (this->is_open ()) |
| 7520 | 88 return 0; |
| 5269 | 89 // Don't support simultaneous read/write access (yet) |
| 90 if ((mode & std::ios_base::in) && (mode & std::ios_base::out)) | |
| 7520 | 91 return 0; |
| 5269 | 92 |
| 93 // Build mode string for gzopen and check it [27.8.1.3.2] | |
| 94 char char_mode[6] = "\0\0\0\0\0"; | |
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95 if (! this->open_mode (mode, char_mode)) |
| 7520 | 96 return 0; |
| 5269 | 97 |
| 98 // Attempt to open file | |
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99 if ((file = gzopen (name, char_mode)) == 0) |
| 7520 | 100 return 0; |
| 5269 | 101 |
| 102 // On success, allocate internal buffer and set flags | |
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103 this->enable_buffer (); |
| 5269 | 104 io_mode = mode; |
| 105 own_fd = true; | |
| 106 return this; | |
| 107 } | |
| 108 | |
| 109 // Attach to gzipped file | |
| 110 gzfilebuf* | |
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111 gzfilebuf::attach (int fd, std::ios_base::openmode mode) |
| 5269 | 112 { |
| 113 // Fail if file already open | |
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114 if (this->is_open ()) |
| 7520 | 115 return 0; |
| 5269 | 116 // Don't support simultaneous read/write access (yet) |
| 117 if ((mode & std::ios_base::in) && (mode & std::ios_base::out)) | |
| 7520 | 118 return 0; |
| 5269 | 119 |
| 120 // Build mode string for gzdopen and check it [27.8.1.3.2] | |
| 121 char char_mode[6] = "\0\0\0\0\0"; | |
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122 if (! this->open_mode (mode, char_mode)) |
| 7520 | 123 return 0; |
| 5269 | 124 |
| 125 // Attempt to attach to file | |
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126 if ((file = gzdopen (fd, char_mode)) == 0) |
| 7520 | 127 return 0; |
| 5269 | 128 |
| 129 // On success, allocate internal buffer and set flags | |
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130 this->enable_buffer (); |
| 5269 | 131 io_mode = mode; |
| 132 own_fd = false; | |
| 133 return this; | |
| 134 } | |
| 135 | |
| 136 // Close gzipped file | |
| 137 gzfilebuf* | |
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138 gzfilebuf::close () |
| 5269 | 139 { |
| 140 // Fail immediately if no file is open | |
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141 if (! this->is_open ()) |
| 7520 | 142 return 0; |
| 5269 | 143 // Assume success |
| 144 gzfilebuf* retval = this; | |
| 145 // Attempt to sync and close gzipped file | |
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146 if (this->sync () == -1) |
| 7520 | 147 retval = 0; |
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148 if (gzclose (file) < 0) |
| 7520 | 149 retval = 0; |
| 5269 | 150 // File is now gone anyway (postcondition [27.8.1.3.8]) |
| 7520 | 151 file = 0; |
| 5269 | 152 own_fd = false; |
| 153 // Destroy internal buffer if it exists | |
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154 this->disable_buffer (); |
| 5269 | 155 return retval; |
| 156 } | |
| 157 | |
| 158 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 159 | |
| 160 // Convert int open mode to mode string | |
| 161 bool | |
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162 gzfilebuf::open_mode (std::ios_base::openmode mode, char* c_mode) const |
| 5269 | 163 { |
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164 // FIXME: do we need testb? |
| 6959 | 165 // bool testb = mode & std::ios_base::binary; |
| 5269 | 166 bool testi = mode & std::ios_base::in; |
| 167 bool testo = mode & std::ios_base::out; | |
| 168 bool testt = mode & std::ios_base::trunc; | |
| 169 bool testa = mode & std::ios_base::app; | |
| 170 | |
| 171 // Check for valid flag combinations - see [27.8.1.3.2] (Table 92) | |
| 172 // Original zfstream hardcoded the compression level to maximum here... | |
| 173 // Double the time for less than 1% size improvement seems | |
| 174 // excessive though - keeping it at the default level | |
| 175 // To change back, just append "9" to the next three mode strings | |
| 176 if (!testi && testo && !testt && !testa) | |
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177 strcpy (c_mode, "w"); |
| 5269 | 178 if (!testi && testo && !testt && testa) |
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179 strcpy (c_mode, "a"); |
| 5269 | 180 if (!testi && testo && testt && !testa) |
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181 strcpy (c_mode, "w"); |
| 5269 | 182 if (testi && !testo && !testt && !testa) |
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183 strcpy (c_mode, "r"); |
| 5269 | 184 // No read/write mode yet |
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185 // if (testi && testo && !testt && !testa) |
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186 // strcpy(c_mode, "r+"); |
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187 // if (testi && testo && testt && !testa) |
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188 // strcpy(c_mode, "w+"); |
| 5269 | 189 |
| 190 // Mode string should be empty for invalid combination of flags | |
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191 if (strlen (c_mode) == 0) |
| 5269 | 192 return false; |
| 6275 | 193 |
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194 strcat (c_mode, "b"); |
| 6275 | 195 |
| 5269 | 196 return true; |
| 197 } | |
| 198 | |
| 199 // Determine number of characters in internal get buffer | |
| 200 std::streamsize | |
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201 gzfilebuf::showmanyc () |
| 5269 | 202 { |
| 203 // Calls to underflow will fail if file not opened for reading | |
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204 if (! this->is_open () || !(io_mode & std::ios_base::in)) |
| 5269 | 205 return -1; |
| 206 // Make sure get area is in use | |
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207 if (this->gptr () && (this->gptr () < this->egptr ())) |
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208 return std::streamsize (this->egptr () - this->gptr ()); |
| 5269 | 209 else |
| 210 return 0; | |
| 211 } | |
| 212 | |
| 6777 | 213 // Puts back a character to the stream in two cases. Firstly, when there |
| 214 // is no putback position available, and secondly when the character putback | |
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215 // differs from the one in the file. We can only support the first case |
| 6777 | 216 // with gzipped files. |
| 217 gzfilebuf::int_type | |
| 218 gzfilebuf::pbackfail (gzfilebuf::int_type c) | |
| 219 { | |
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220 if (this->is_open ()) |
| 6777 | 221 { |
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222 if (gzseek (file, this->gptr () - this->egptr () - 1, SEEK_CUR) < 0) |
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223 return traits_type::eof (); |
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224 |
| 6777 | 225 // Invalidates contents of the buffer |
| 226 enable_buffer (); | |
| 227 | |
| 228 // Attempt to fill internal buffer from gzipped file | |
| 229 // (buffer must be guaranteed to exist...) | |
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230 int bytes_read = gzread (file, buffer, buffer_size); |
| 6777 | 231 // Indicates error or EOF |
| 232 if (bytes_read <= 0) | |
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233 { |
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234 // Reset get area |
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235 this->setg (buffer, buffer, buffer); |
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236 return traits_type::eof (); |
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237 } |
| 6777 | 238 |
| 239 // Make all bytes read from file available as get area | |
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240 this->setg (buffer, buffer, buffer + bytes_read); |
| 6777 | 241 |
| 242 // If next character in get area differs from putback character | |
| 243 // flag a failure | |
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244 gzfilebuf::int_type ret = traits_type::to_int_type (*(this->gptr ())); |
| 6777 | 245 if (ret != c) |
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246 return traits_type::eof (); |
| 6777 | 247 else |
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248 return ret; |
| 6777 | 249 } |
| 250 else | |
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251 return traits_type::eof (); |
| 6777 | 252 } |
| 253 | |
| 5269 | 254 // Fill get area from gzipped file |
| 255 gzfilebuf::int_type | |
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256 gzfilebuf::underflow () |
| 5269 | 257 { |
| 258 // If something is left in the get area by chance, return it | |
| 259 // (this shouldn't normally happen, as underflow is only supposed | |
| 260 // to be called when gptr >= egptr, but it serves as error check) | |
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261 if (this->gptr () && (this->gptr () < this->egptr ())) |
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262 return traits_type::to_int_type (*(this->gptr ())); |
| 5269 | 263 |
| 264 // If the file hasn't been opened for reading, produce error | |
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265 if (! this->is_open () || !(io_mode & std::ios_base::in)) |
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266 return traits_type::eof (); |
| 5269 | 267 |
| 6783 | 268 // Copy the final characters to the front of the buffer |
| 269 int stash = 0; | |
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270 if (this->eback () && buffer && buffer_size > STASHED_CHARACTERS) |
| 6783 | 271 { |
| 272 char_type *ptr1 = buffer; | |
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273 char_type *ptr2 = this->egptr () - STASHED_CHARACTERS + 1; |
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274 if (ptr2 > this->eback ()) |
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275 while (stash++ <= STASHED_CHARACTERS) |
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276 *ptr1++ = *ptr2++; |
| 6783 | 277 } |
| 278 | |
| 5269 | 279 // Attempt to fill internal buffer from gzipped file |
| 280 // (buffer must be guaranteed to exist...) | |
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281 int bytes_read = gzread (file, buffer + stash, buffer_size - stash); |
| 6783 | 282 |
| 5269 | 283 // Indicates error or EOF |
| 284 if (bytes_read <= 0) | |
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285 { |
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286 // Reset get area |
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287 this->setg (buffer, buffer, buffer); |
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288 return traits_type::eof (); |
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289 } |
| 6783 | 290 // Make all bytes read from file plus the stash available as get area |
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291 this->setg (buffer, buffer + stash, buffer + bytes_read + stash); |
| 5269 | 292 |
| 293 // Return next character in get area | |
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294 return traits_type::to_int_type (*(this->gptr ())); |
| 5269 | 295 } |
| 296 | |
| 297 // Write put area to gzipped file | |
| 298 gzfilebuf::int_type | |
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299 gzfilebuf::overflow (int_type c) |
| 5269 | 300 { |
| 301 // Determine whether put area is in use | |
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302 if (this->pbase ()) |
| 5269 | 303 { |
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304 // Double-check pointer range |
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305 if (this->pptr () > this->epptr () || this->pptr () < this->pbase ()) |
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306 return traits_type::eof (); |
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307 // Add extra character to buffer if not EOF |
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308 if (! traits_type::eq_int_type (c, traits_type::eof ())) |
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309 { |
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310 *(this->pptr ()) = traits_type::to_char_type (c); |
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311 this->pbump (1); |
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312 } |
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313 // Number of characters to write to file |
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314 int bytes_to_write = this->pptr () - this->pbase (); |
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315 // Overflow doesn't fail if nothing is to be written |
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316 if (bytes_to_write > 0) |
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317 { |
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318 // If the file hasn't been opened for writing, produce error |
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319 if (! this->is_open () || !(io_mode & std::ios_base::out)) |
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320 return traits_type::eof (); |
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321 // If gzipped file won't accept all bytes written to it, fail |
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322 if (gzwrite (file, this->pbase (), bytes_to_write) != bytes_to_write) |
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323 return traits_type::eof (); |
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324 // Reset next pointer to point to pbase on success |
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325 this->pbump (-bytes_to_write); |
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326 } |
| 5269 | 327 } |
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328 // Write extra character to file if not EOF |
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329 else if (! traits_type::eq_int_type (c, traits_type::eof ())) |
| 5269 | 330 { |
| 331 // If the file hasn't been opened for writing, produce error | |
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332 if (! this->is_open () || !(io_mode & std::ios_base::out)) |
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333 return traits_type::eof (); |
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334 // Impromptu char buffer (allows "unbuffered" output) |
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335 char_type last_char = traits_type::to_char_type (c); |
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336 // If gzipped file won't accept this character, fail |
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337 if (gzwrite (file, &last_char, 1) != 1) |
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338 return traits_type::eof (); |
| 5269 | 339 } |
| 340 | |
| 341 // If you got here, you have succeeded (even if c was EOF) | |
| 342 // The return value should therefore be non-EOF | |
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343 if (traits_type::eq_int_type (c, traits_type::eof ())) |
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344 return traits_type::not_eof (c); |
| 5269 | 345 else |
| 346 return c; | |
| 347 } | |
| 348 | |
| 349 // Assign new buffer | |
| 350 std::streambuf* | |
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351 gzfilebuf::setbuf (char_type* p, std::streamsize n) |
| 5269 | 352 { |
| 353 // First make sure stuff is sync'ed, for safety | |
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354 if (this->sync () == -1) |
| 7520 | 355 return 0; |
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356 // If buffering is turned off on purpose via setbuf(0,0), still allocate one. |
| 5269 | 357 // "Unbuffered" only really refers to put [27.8.1.4.10], while get needs at |
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358 // least a buffer of size 1 (very inefficient though, therefore make it |
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359 // bigger?). This follows from [27.5.2.4.3]/12 (gptr needs to point at |
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360 // something, it seems). |
| 5269 | 361 if (!p || !n) |
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362 { |
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363 // Replace existing buffer (if any) with small internal buffer |
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364 this->disable_buffer (); |
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365 buffer = 0; |
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366 buffer_size = 0; |
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367 own_buffer = true; |
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368 this->enable_buffer (); |
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369 } |
| 5269 | 370 else |
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371 { |
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372 // Replace existing buffer (if any) with external buffer |
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373 this->disable_buffer (); |
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374 buffer = p; |
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375 buffer_size = n; |
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376 own_buffer = false; |
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377 this->enable_buffer (); |
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378 } |
| 5269 | 379 return this; |
| 380 } | |
| 381 | |
| 382 // Write put area to gzipped file (i.e. ensures that put area is empty) | |
| 383 int | |
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384 gzfilebuf::sync () |
| 5269 | 385 { |
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386 return traits_type::eq_int_type (this->overflow (), |
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387 traits_type::eof ()) ? -1 : 0; |
| 5269 | 388 } |
| 389 | |
| 390 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 391 | |
| 392 // Allocate internal buffer | |
| 393 void | |
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394 gzfilebuf::enable_buffer () |
| 5269 | 395 { |
| 396 // If internal buffer required, allocate one | |
| 397 if (own_buffer && !buffer) | |
| 398 { | |
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399 // Check for buffered vs. "unbuffered" |
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400 if (buffer_size > 0) |
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401 { |
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402 // Allocate internal buffer |
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403 buffer = new char_type [buffer_size]; |
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404 // Get area starts empty and will be expanded by underflow as needed |
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405 this->setg (buffer, buffer, buffer); |
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406 // Setup entire internal buffer as put area. |
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407 // The one-past-end pointer actually points to the last element of |
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408 // the buffer, so that overflow(c) can safely add the extra character |
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409 // c to the sequence. These pointers remain in place for the |
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410 // duration of the buffer |
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411 this->setp (buffer, buffer + buffer_size - 1); |
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412 } |
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413 else |
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414 { |
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415 // Even in "unbuffered" case, (small?) get buffer is still required |
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416 buffer_size = SMALLBUFSIZE; |
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417 buffer = new char_type [buffer_size]; |
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418 this->setg (buffer, buffer, buffer); |
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419 // "Unbuffered" means no put buffer |
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420 this->setp (0, 0); |
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421 } |
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422 } |
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423 else |
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424 { |
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425 // If buffer already allocated, reset buffer pointers just to make sure no |
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426 // stale chars are lying around |
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427 this->setg (buffer, buffer, buffer); |
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428 this->setp (buffer, buffer + buffer_size - 1); |
| 5269 | 429 } |
| 430 } | |
| 431 | |
| 432 // Destroy internal buffer | |
| 433 void | |
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434 gzfilebuf::disable_buffer () |
| 5269 | 435 { |
| 436 // If internal buffer exists, deallocate it | |
| 437 if (own_buffer && buffer) | |
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438 { |
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439 // Preserve unbuffered status by zeroing size |
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440 if (! this->pbase ()) |
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441 buffer_size = 0; |
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442 delete[] buffer; |
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443 buffer = 0; |
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444 this->setg (0, 0, 0); |
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445 this->setp (0, 0); |
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446 } |
| 5269 | 447 else |
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448 { |
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449 // Reset buffer pointers to initial state if external buffer exists |
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450 this->setg (buffer, buffer, buffer); |
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451 if (buffer) |
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452 this->setp (buffer, buffer + buffer_size - 1); |
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453 else |
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454 this->setp (0, 0); |
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455 } |
| 5269 | 456 } |
| 457 | |
| 458 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ | |
| 459 | |
| 460 // Seek functions | |
| 461 gzfilebuf::pos_type | |
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462 gzfilebuf::seekoff (off_type off, std::ios_base::seekdir way, |
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463 std::ios_base::openmode) |
| 5269 | 464 { |
| 465 pos_type ret = pos_type (off_type (-1)); | |
| 466 | |
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467 if (this->is_open ()) |
| 5269 | 468 { |
| 469 off_type computed_off = off; | |
| 470 | |
| 471 if ((io_mode & std::ios_base::in) && way == std::ios_base::cur) | |
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472 computed_off += this->gptr () - this->egptr (); |
| 5269 | 473 |
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474 // Handle tellg/tellp as a special case up front, no need to seek |
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475 // or invalidate get/put buffers |
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476 if (off == 0 && way == std::ios_base::cur) |
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477 return pos_type (gztell (file) + computed_off); |
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478 |
| 5269 | 479 if (way == std::ios_base::beg) |
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480 ret = pos_type (gzseek (file, computed_off, SEEK_SET)); |
| 5269 | 481 else if (way == std::ios_base::cur) |
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482 ret = pos_type (gzseek (file, computed_off, SEEK_CUR)); |
| 5269 | 483 else |
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484 // Can't seek from end of a gzipped file, so this will give -1 |
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485 ret = pos_type (gzseek (file, computed_off, SEEK_END)); |
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486 |
| 5269 | 487 if (io_mode & std::ios_base::in) |
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488 // Invalidates contents of the buffer |
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489 enable_buffer (); |
| 5269 | 490 else |
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491 // flush contents of buffer to file |
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492 overflow (); |
| 5269 | 493 } |
| 494 | |
| 495 return ret; | |
| 496 } | |
| 497 | |
| 498 gzfilebuf::pos_type | |
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499 gzfilebuf::seekpos (pos_type sp, std::ios_base::openmode) |
| 5269 | 500 { |
| 501 pos_type ret = pos_type (off_type (-1)); | |
| 502 | |
| 503 if (this->is_open ()) | |
| 504 { | |
| 505 ret = pos_type (gzseek (file, sp, SEEK_SET)); | |
| 506 | |
| 507 if (io_mode & std::ios_base::in) | |
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508 // Invalidates contents of the buffer |
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509 enable_buffer (); |
| 5269 | 510 else |
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511 // flush contents of buffer to file |
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512 overflow (); |
| 5269 | 513 } |
| 514 | |
| 515 return ret; | |
| 516 } | |
| 517 | |
| 518 /*****************************************************************************/ | |
| 519 | |
| 520 // Default constructor initializes stream buffer | |
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521 gzifstream::gzifstream () |
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522 : std::istream (0), sb () |
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523 { this->init (&sb); } |
| 5269 | 524 |
| 525 // Initialize stream buffer and open file | |
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526 gzifstream::gzifstream (const char* name, std::ios_base::openmode mode) |
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527 : std::istream (0), sb () |
| 5269 | 528 { |
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529 this->init (&sb); |
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530 this->open (name, mode); |
| 5269 | 531 } |
| 532 | |
| 533 // Initialize stream buffer and attach to file | |
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534 gzifstream::gzifstream (int fd, std::ios_base::openmode mode) |
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535 : std::istream (0), sb () |
| 5269 | 536 { |
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537 this->init (&sb); |
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538 this->attach (fd, mode); |
| 5269 | 539 } |
| 540 | |
| 541 // Open file and go into fail() state if unsuccessful | |
| 542 void | |
|
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543 gzifstream::open (const char* name, std::ios_base::openmode mode) |
| 5269 | 544 { |
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545 if (! sb.open (name, mode | std::ios_base::in)) |
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546 this->setstate (std::ios_base::failbit); |
| 5269 | 547 else |
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548 this->clear (); |
| 5269 | 549 } |
| 550 | |
| 551 // Attach to file and go into fail() state if unsuccessful | |
| 552 void | |
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553 gzifstream::attach (int fd, std::ios_base::openmode mode) |
| 5269 | 554 { |
|
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555 if (! sb.attach (fd, mode | std::ios_base::in)) |
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556 this->setstate (std::ios_base::failbit); |
| 5269 | 557 else |
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558 this->clear (); |
| 5269 | 559 } |
| 560 | |
| 561 // Close file | |
| 562 void | |
|
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563 gzifstream::close () |
| 5269 | 564 { |
|
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565 if (! sb.close ()) |
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566 this->setstate (std::ios_base::failbit); |
| 5269 | 567 } |
| 568 | |
| 569 /*****************************************************************************/ | |
| 570 | |
| 571 // Default constructor initializes stream buffer | |
|
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572 gzofstream::gzofstream () |
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573 : std::ostream (0), sb () |
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574 { this->init (&sb); } |
| 5269 | 575 |
| 576 // Initialize stream buffer and open file | |
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577 gzofstream::gzofstream (const char* name, std::ios_base::openmode mode) |
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578 : std::ostream (0), sb () |
| 5269 | 579 { |
|
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580 this->init (&sb); |
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581 this->open (name, mode); |
| 5269 | 582 } |
| 583 | |
| 584 // Initialize stream buffer and attach to file | |
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585 gzofstream::gzofstream (int fd, std::ios_base::openmode mode) |
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586 : std::ostream (0), sb () |
| 5269 | 587 { |
|
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588 this->init (&sb); |
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589 this->attach (fd, mode); |
| 5269 | 590 } |
| 591 | |
| 592 // Open file and go into fail() state if unsuccessful | |
| 593 void | |
|
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594 gzofstream::open (const char* name, std::ios_base::openmode mode) |
| 5269 | 595 { |
|
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596 if (! sb.open (name, mode | std::ios_base::out)) |
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597 this->setstate (std::ios_base::failbit); |
| 5269 | 598 else |
|
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599 this->clear (); |
| 5269 | 600 } |
| 601 | |
| 602 // Attach to file and go into fail() state if unsuccessful | |
| 603 void | |
|
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604 gzofstream::attach (int fd, std::ios_base::openmode mode) |
| 5269 | 605 { |
|
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606 if (! sb.attach (fd, mode | std::ios_base::out)) |
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607 this->setstate (std::ios_base::failbit); |
| 5269 | 608 else |
|
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609 this->clear (); |
| 5269 | 610 } |
| 611 | |
| 612 // Close file | |
| 613 void | |
|
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614 gzofstream::close () |
| 5269 | 615 { |
|
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616 if (! sb.close ()) |
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617 this->setstate (std::ios_base::failbit); |
| 5269 | 618 } |
| 619 | |
| 620 #endif // HAVE_ZLIB |