Mercurial > octave
annotate libinterp/corefcn/zfstream.cc @ 21301:40de9f8f23a6
Use '#include "config.h"' rather than <config.h>.
* mk-octave-config-h.sh, mk-opts.pl, Backend.cc, BaseControl.cc,
ButtonControl.cc, Canvas.cc, CheckBoxControl.cc, Container.cc, ContextMenu.cc,
EditControl.cc, Figure.cc, FigureWindow.cc, GLCanvas.cc, KeyMap.cc,
ListBoxControl.cc, Logger.cc, Menu.cc, MouseModeActionGroup.cc, Object.cc,
ObjectFactory.cc, ObjectProxy.cc, Panel.cc, PopupMenuControl.cc,
PushButtonControl.cc, PushTool.cc, QtHandlesUtils.cc, RadioButtonControl.cc,
SliderControl.cc, TextControl.cc, TextEdit.cc, ToggleButtonControl.cc,
ToggleTool.cc, ToolBar.cc, ToolBarButton.cc, __init_qt__.cc,
annotation-dialog.cc, gl-select.cc, module.mk, kpty.cpp, color-picker.cc,
dialog.cc, documentation-dock-widget.cc, files-dock-widget.cc,
find-files-dialog.cc, find-files-model.cc, history-dock-widget.cc,
file-editor-tab.cc, file-editor-tab.h, file-editor.cc, find-dialog.cc,
marker.cc, octave-qscintilla.cc, octave-txt-lexer.cc, main-window.cc,
octave-cmd.cc, octave-dock-widget.cc, octave-gui.cc, octave-interpreter.cc,
octave-qt-link.cc, parser.cc, webinfo.cc, resource-manager.cc,
settings-dialog.cc, shortcut-manager.cc, terminal-dock-widget.cc,
thread-manager.cc, welcome-wizard.cc, workspace-model.cc, workspace-view.cc,
build-env-features.sh, build-env.in.cc, Cell.cc, __contourc__.cc,
__dispatch__.cc, __dsearchn__.cc, __ichol__.cc, __ilu__.cc, __lin_interpn__.cc,
__pchip_deriv__.cc, __qp__.cc, balance.cc, besselj.cc, betainc.cc, bitfcns.cc,
bsxfun.cc, c-file-ptr-stream.cc, cdisplay.c, cellfun.cc, coct-hdf5-types.c,
colloc.cc, comment-list.cc, conv2.cc, daspk.cc, dasrt.cc, dassl.cc, data.cc,
debug.cc, defaults.cc, defun.cc, det.cc, dirfns.cc, display.cc, dlmread.cc,
dot.cc, dynamic-ld.cc, eig.cc, ellipj.cc, error.cc, errwarn.cc, event-queue.cc,
fft.cc, fft2.cc, fftn.cc, file-io.cc, filter.cc, find.cc, ft-text-renderer.cc,
gammainc.cc, gcd.cc, getgrent.cc, getpwent.cc, getrusage.cc, givens.cc,
gl-render.cc, gl2ps-print.cc, graphics.cc, gripes.cc, hash.cc, help.cc,
hess.cc, hex2num.cc, hook-fcn.cc, input.cc, inv.cc, jit-ir.cc, jit-typeinfo.cc,
jit-util.cc, kron.cc, load-path.cc, load-save.cc, lookup.cc,
ls-ascii-helper.cc, ls-hdf5.cc, ls-mat-ascii.cc, ls-mat4.cc, ls-mat5.cc,
ls-oct-binary.cc, ls-oct-text.cc, ls-utils.cc, lsode.cc, lu.cc, luinc.cc,
mappers.cc, matrix_type.cc, max.cc, mex.cc, mgorth.cc, nproc.cc,
oct-errno.in.cc, oct-fstrm.cc, oct-hdf5-types.cc, oct-hist.cc, oct-iostrm.cc,
oct-lvalue.cc, oct-map.cc, oct-prcstrm.cc, oct-procbuf.cc, oct-stream.cc,
oct-strstrm.cc, oct-tex-lexer.in.ll, oct-tex-parser.in.yy, octave-link.cc,
ordschur.cc, pager.cc, pinv.cc, pr-output.cc, procstream.cc, profiler.cc,
psi.cc, pt-jit.cc, quad.cc, quadcc.cc, qz.cc, rand.cc, rcond.cc, regexp.cc,
schur.cc, sighandlers.cc, siglist.c, sparse-xdiv.cc, sparse-xpow.cc, sparse.cc,
spparms.cc, sqrtm.cc, str2double.cc, strfind.cc, strfns.cc, sub2ind.cc, svd.cc,
sylvester.cc, symtab.cc, syscalls.cc, sysdep.cc, text-renderer.cc, time.cc,
toplev.cc, tril.cc, tsearch.cc, txt-eng.cc, typecast.cc, urlwrite.cc, utils.cc,
variables.cc, xdiv.cc, xgl2ps.c, xnorm.cc, xpow.cc, zfstream.cc,
__delaunayn__.cc, __eigs__.cc, __fltk_uigetfile__.cc, __glpk__.cc,
__init_fltk__.cc, __init_gnuplot__.cc, __magick_read__.cc, __osmesa_print__.cc,
__voronoi__.cc, amd.cc, audiodevinfo.cc, audioread.cc, ccolamd.cc, chol.cc,
colamd.cc, convhulln.cc, dmperm.cc, fftw.cc, qr.cc, symbfact.cc, symrcm.cc,
mkbuiltins, mkops, ov-base-diag.cc, ov-base-int.cc, ov-base-mat.cc,
ov-base-scalar.cc, ov-base-sparse.cc, ov-base.cc, ov-bool-mat.cc,
ov-bool-sparse.cc, ov-bool.cc, ov-builtin.cc, ov-cell.cc, ov-ch-mat.cc,
ov-class.cc, ov-classdef.cc, ov-colon.cc, ov-complex.cc, ov-cs-list.cc,
ov-cx-diag.cc, ov-cx-mat.cc, ov-cx-sparse.cc, ov-dld-fcn.cc, ov-fcn-handle.cc,
ov-fcn-inline.cc, ov-fcn.cc, ov-float.cc, ov-flt-complex.cc, ov-flt-cx-diag.cc,
ov-flt-cx-mat.cc, ov-flt-re-diag.cc, ov-flt-re-mat.cc, ov-int16.cc,
ov-int32.cc, ov-int64.cc, ov-int8.cc, ov-java.cc, ov-lazy-idx.cc,
ov-mex-fcn.cc, ov-null-mat.cc, ov-oncleanup.cc, ov-perm.cc, ov-range.cc,
ov-re-diag.cc, ov-re-mat.cc, ov-re-sparse.cc, ov-scalar.cc, ov-str-mat.cc,
ov-struct.cc, ov-typeinfo.cc, ov-uint16.cc, ov-uint32.cc, ov-uint64.cc,
ov-uint8.cc, ov-usr-fcn.cc, ov.cc, ovl.cc, octave.cc, op-b-b.cc, op-b-bm.cc,
op-b-sbm.cc, op-bm-b.cc, op-bm-bm.cc, op-bm-sbm.cc, op-cdm-cdm.cc, op-cell.cc,
op-chm.cc, op-class.cc, op-cm-cm.cc, op-cm-cs.cc, op-cm-m.cc, op-cm-s.cc,
op-cm-scm.cc, op-cm-sm.cc, op-cs-cm.cc, op-cs-cs.cc, op-cs-m.cc, op-cs-s.cc,
op-cs-scm.cc, op-cs-sm.cc, op-dm-dm.cc, op-dm-scm.cc, op-dm-sm.cc,
op-dm-template.cc, op-dms-template.cc, op-double-conv.cc, op-fcdm-fcdm.cc,
op-fcdm-fdm.cc, op-fcm-fcm.cc, op-fcm-fcs.cc, op-fcm-fm.cc, op-fcm-fs.cc,
op-fcn.cc, op-fcs-fcm.cc, op-fcs-fcs.cc, op-fcs-fm.cc, op-fcs-fs.cc,
op-fdm-fdm.cc, op-float-conv.cc, op-fm-fcm.cc, op-fm-fcs.cc, op-fm-fm.cc,
op-fm-fs.cc, op-fs-fcm.cc, op-fs-fcs.cc, op-fs-fm.cc, op-fs-fs.cc,
op-i16-i16.cc, op-i32-i32.cc, op-i64-i64.cc, op-i8-i8.cc, op-int-concat.cc,
op-int-conv.cc, op-m-cm.cc, op-m-cs.cc, op-m-m.cc, op-m-s.cc, op-m-scm.cc,
op-m-sm.cc, op-pm-pm.cc, op-pm-scm.cc, op-pm-sm.cc, op-pm-template.cc,
op-range.cc, op-s-cm.cc, op-s-cs.cc, op-s-m.cc, op-s-s.cc, op-s-scm.cc,
op-s-sm.cc, op-sbm-b.cc, op-sbm-bm.cc, op-sbm-sbm.cc, op-scm-cm.cc,
op-scm-cs.cc, op-scm-m.cc, op-scm-s.cc, op-scm-scm.cc, op-scm-sm.cc,
op-sm-cm.cc, op-sm-cs.cc, op-sm-m.cc, op-sm-s.cc, op-sm-scm.cc, op-sm-sm.cc,
op-str-m.cc, op-str-s.cc, op-str-str.cc, op-struct.cc, op-ui16-ui16.cc,
op-ui32-ui32.cc, op-ui64-ui64.cc, op-ui8-ui8.cc, lex.ll, oct-parse.in.yy,
pt-arg-list.cc, pt-array-list.cc, pt-assign.cc, pt-binop.cc, pt-bp.cc,
pt-cbinop.cc, pt-cell.cc, pt-check.cc, pt-classdef.cc, pt-cmd.cc, pt-colon.cc,
pt-const.cc, pt-decl.cc, pt-eval.cc, pt-except.cc, pt-exp.cc, pt-fcn-handle.cc,
pt-funcall.cc, pt-id.cc, pt-idx.cc, pt-jump.cc, pt-loop.cc, pt-mat.cc,
pt-misc.cc, pt-pr-code.cc, pt-select.cc, pt-stmt.cc, pt-unop.cc, pt.cc,
token.cc, Array-jit.cc, Array-os.cc, Array-sym.cc, Array-tc.cc, version.cc,
Array-C.cc, Array-b.cc, Array-ch.cc, Array-d.cc, Array-f.cc, Array-fC.cc,
Array-i.cc, Array-idx-vec.cc, Array-s.cc, Array-str.cc, Array-util.cc,
Array-voidp.cc, Array.cc, CColVector.cc, CDiagMatrix.cc, CMatrix.cc,
CNDArray.cc, CRowVector.cc, CSparse.cc, DiagArray2.cc, MArray-C.cc,
MArray-d.cc, MArray-f.cc, MArray-fC.cc, MArray-i.cc, MArray-s.cc, MArray.cc,
MDiagArray2.cc, MSparse-C.cc, MSparse-d.cc, MatrixType.cc, PermMatrix.cc,
Range.cc, Sparse-C.cc, Sparse-b.cc, Sparse-d.cc, Sparse.cc, boolMatrix.cc,
boolNDArray.cc, boolSparse.cc, chMatrix.cc, chNDArray.cc, dColVector.cc,
dDiagMatrix.cc, dMatrix.cc, dNDArray.cc, dRowVector.cc, dSparse.cc,
dim-vector.cc, fCColVector.cc, fCDiagMatrix.cc, fCMatrix.cc, fCNDArray.cc,
fCRowVector.cc, fColVector.cc, fDiagMatrix.cc, fMatrix.cc, fNDArray.cc,
fRowVector.cc, idx-vector.cc, int16NDArray.cc, int32NDArray.cc,
int64NDArray.cc, int8NDArray.cc, intNDArray.cc, uint16NDArray.cc,
uint32NDArray.cc, uint64NDArray.cc, uint8NDArray.cc, blaswrap.c, cquit.c,
f77-extern.cc, f77-fcn.c, lo-error.c, quit.cc, CollocWt.cc, DASPK.cc, DASRT.cc,
DASSL.cc, EIG.cc, LSODE.cc, ODES.cc, Quad.cc, aepbalance.cc, chol.cc,
eigs-base.cc, fEIG.cc, gepbalance.cc, hess.cc, lo-mappers.cc, lo-specfun.cc,
lu.cc, oct-convn.cc, oct-fftw.cc, oct-norm.cc, oct-rand.cc, oct-spparms.cc,
qr.cc, qrp.cc, randgamma.c, randmtzig.c, randpoisson.c, schur.cc,
sparse-chol.cc, sparse-dmsolve.cc, sparse-lu.cc, sparse-qr.cc, svd.cc,
mk-ops.awk, dir-ops.cc, file-ops.cc, file-stat.cc, lo-sysdep.cc, mach-info.cc,
oct-env.cc, oct-group.cc, oct-passwd.cc, oct-syscalls.cc, oct-time.cc,
oct-uname.cc, cmd-edit.cc, cmd-hist.cc, data-conv.cc, f2c-main.c,
glob-match.cc, kpse.cc, lo-array-errwarn.cc, lo-array-gripes.cc, lo-cutils.c,
lo-ieee.cc, lo-regexp.cc, lo-utils.cc, oct-base64.cc, oct-glob.cc,
oct-inttypes.cc, oct-locbuf.cc, oct-mutex.cc, oct-rl-edit.c, oct-rl-hist.c,
oct-shlib.cc, oct-sort.cc, pathsearch.cc, singleton-cleanup.cc, sparse-sort.cc,
sparse-util.cc, str-vec.cc, unwind-prot.cc, url-transfer.cc,
display-available.c, main-cli.cc, main-gui.cc, main.in.cc, mkoctfile.in.cc,
octave-config.in.cc:
Use '#include "config.h"' rather than <config.h>.
| author | Rik <rik@octave.org> |
|---|---|
| date | Thu, 18 Feb 2016 13:34:50 -0800 |
| parents | fcac5dbbf9ed |
| children | aba2e6293dd8 |
| rev | line source |
|---|---|
| 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 | |
|
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44 // For strcpy, strcat, strlen (mode strings). |
|
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45 #include <cstring> |
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46 // For BUFSIZ. |
|
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47 #include <cstdio> |
| 5269 | 48 |
| 49 // Internal buffer sizes (default and "unbuffered" versions) | |
| 6783 | 50 #define STASHED_CHARACTERS 16 |
|
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51 #define BIGBUFSIZE (256 * 1024 + STASHED_CHARACTERS) |
| 5269 | 52 #define SMALLBUFSIZE 1 |
| 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 | |
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176 if (! testi && testo && ! testt && ! testa) |
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177 strcpy (c_mode, "w"); |
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178 if (! testi && testo && ! testt && testa) |
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179 strcpy (c_mode, "a"); |
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180 if (! testi && testo && testt && ! testa) |
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181 strcpy (c_mode, "w"); |
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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). |
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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 | |
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397 if (own_buffer && ! buffer) |
| 5269 | 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 // Default constructor initializes stream buffer | |
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519 gzifstream::gzifstream () |
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520 : std::istream (0), sb () |
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521 { this->init (&sb); } |
| 5269 | 522 |
| 523 // Initialize stream buffer and open file | |
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524 gzifstream::gzifstream (const char* name, std::ios_base::openmode mode) |
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525 : std::istream (0), sb () |
| 5269 | 526 { |
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527 this->init (&sb); |
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528 this->open (name, mode); |
| 5269 | 529 } |
| 530 | |
| 531 // Initialize stream buffer and attach to file | |
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532 gzifstream::gzifstream (int fd, std::ios_base::openmode mode) |
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533 : std::istream (0), sb () |
| 5269 | 534 { |
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535 this->init (&sb); |
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536 this->attach (fd, mode); |
| 5269 | 537 } |
| 538 | |
| 539 // Open file and go into fail() state if unsuccessful | |
| 540 void | |
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541 gzifstream::open (const char* name, std::ios_base::openmode mode) |
| 5269 | 542 { |
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543 if (! sb.open (name, mode | std::ios_base::in)) |
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544 this->setstate (std::ios_base::failbit); |
| 5269 | 545 else |
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546 this->clear (); |
| 5269 | 547 } |
| 548 | |
| 549 // Attach to file and go into fail() state if unsuccessful | |
| 550 void | |
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551 gzifstream::attach (int fd, std::ios_base::openmode mode) |
| 5269 | 552 { |
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553 if (! sb.attach (fd, mode | std::ios_base::in)) |
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554 this->setstate (std::ios_base::failbit); |
| 5269 | 555 else |
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556 this->clear (); |
| 5269 | 557 } |
| 558 | |
| 559 // Close file | |
| 560 void | |
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561 gzifstream::close () |
| 5269 | 562 { |
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563 if (! sb.close ()) |
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564 this->setstate (std::ios_base::failbit); |
| 5269 | 565 } |
| 566 | |
| 567 // Default constructor initializes stream buffer | |
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568 gzofstream::gzofstream () |
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569 : std::ostream (0), sb () |
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570 { this->init (&sb); } |
| 5269 | 571 |
| 572 // Initialize stream buffer and open file | |
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573 gzofstream::gzofstream (const char* name, std::ios_base::openmode mode) |
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574 : std::ostream (0), sb () |
| 5269 | 575 { |
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576 this->init (&sb); |
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577 this->open (name, mode); |
| 5269 | 578 } |
| 579 | |
| 580 // Initialize stream buffer and attach to file | |
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581 gzofstream::gzofstream (int fd, std::ios_base::openmode mode) |
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582 : std::ostream (0), sb () |
| 5269 | 583 { |
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584 this->init (&sb); |
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585 this->attach (fd, mode); |
| 5269 | 586 } |
| 587 | |
| 588 // Open file and go into fail() state if unsuccessful | |
| 589 void | |
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590 gzofstream::open (const char* name, std::ios_base::openmode mode) |
| 5269 | 591 { |
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592 if (! sb.open (name, mode | std::ios_base::out)) |
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593 this->setstate (std::ios_base::failbit); |
| 5269 | 594 else |
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595 this->clear (); |
| 5269 | 596 } |
| 597 | |
| 598 // Attach to file and go into fail() state if unsuccessful | |
| 599 void | |
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600 gzofstream::attach (int fd, std::ios_base::openmode mode) |
| 5269 | 601 { |
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602 if (! sb.attach (fd, mode | std::ios_base::out)) |
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603 this->setstate (std::ios_base::failbit); |
| 5269 | 604 else |
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605 this->clear (); |
| 5269 | 606 } |
| 607 | |
| 608 // Close file | |
| 609 void | |
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610 gzofstream::close () |
| 5269 | 611 { |
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612 if (! sb.close ()) |
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613 this->setstate (std::ios_base::failbit); |
| 5269 | 614 } |
| 615 | |
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616 #endif |