Mercurial > octave-nkf
view libinterp/corefcn/zfstream.cc @ 17787:175b392e91fe
Use GNU style coding conventions for code in libinterp/
* libinterp/corefcn/Cell.h, libinterp/corefcn/__contourc__.cc,
libinterp/corefcn/__dispatch__.cc, libinterp/corefcn/__lin_interpn__.cc,
libinterp/corefcn/__pchip_deriv__.cc, libinterp/corefcn/__qp__.cc,
libinterp/corefcn/balance.cc, libinterp/corefcn/besselj.cc,
libinterp/corefcn/betainc.cc, libinterp/corefcn/bitfcns.cc,
libinterp/corefcn/bsxfun.cc, libinterp/corefcn/c-file-ptr-stream.cc,
libinterp/corefcn/c-file-ptr-stream.h, libinterp/corefcn/cellfun.cc,
libinterp/corefcn/colloc.cc, libinterp/corefcn/comment-list.h,
libinterp/corefcn/conv2.cc, libinterp/corefcn/daspk.cc,
libinterp/corefcn/dasrt.cc, libinterp/corefcn/dassl.cc,
libinterp/corefcn/data.cc, libinterp/corefcn/debug.cc,
libinterp/corefcn/defaults.cc, libinterp/corefcn/defaults.in.h,
libinterp/corefcn/defun-int.h, libinterp/corefcn/defun.cc,
libinterp/corefcn/det.cc, libinterp/corefcn/dirfns.cc,
libinterp/corefcn/display.cc, libinterp/corefcn/dlmread.cc,
libinterp/corefcn/dot.cc, libinterp/corefcn/dynamic-ld.cc,
libinterp/corefcn/dynamic-ld.h, libinterp/corefcn/eig.cc,
libinterp/corefcn/ellipj.cc, libinterp/corefcn/error.cc,
libinterp/corefcn/error.h, libinterp/corefcn/event-queue.h,
libinterp/corefcn/fft.cc, libinterp/corefcn/fft2.cc, libinterp/corefcn/fftn.cc,
libinterp/corefcn/file-io.cc, libinterp/corefcn/filter.cc,
libinterp/corefcn/find.cc, libinterp/corefcn/gammainc.cc,
libinterp/corefcn/gcd.cc, libinterp/corefcn/getgrent.cc,
libinterp/corefcn/getpwent.cc, libinterp/corefcn/getrusage.cc,
libinterp/corefcn/givens.cc, libinterp/corefcn/gl-render.cc,
libinterp/corefcn/gl2ps-renderer.cc, libinterp/corefcn/gl2ps-renderer.h,
libinterp/corefcn/graphics.cc, libinterp/corefcn/graphics.in.h,
libinterp/corefcn/gripes.cc, libinterp/corefcn/gripes.h,
libinterp/corefcn/help.cc, libinterp/corefcn/hess.cc,
libinterp/corefcn/hex2num.cc, libinterp/corefcn/input.cc,
libinterp/corefcn/input.h, libinterp/corefcn/inv.cc,
libinterp/corefcn/jit-ir.h, libinterp/corefcn/jit-typeinfo.cc,
libinterp/corefcn/jit-typeinfo.h, libinterp/corefcn/jit-util.h,
libinterp/corefcn/kron.cc, libinterp/corefcn/load-path.cc,
libinterp/corefcn/load-path.h, libinterp/corefcn/load-save.cc,
libinterp/corefcn/load-save.h, libinterp/corefcn/lookup.cc,
libinterp/corefcn/ls-ascii-helper.cc, libinterp/corefcn/ls-hdf5.cc,
libinterp/corefcn/ls-hdf5.h, libinterp/corefcn/ls-mat-ascii.cc,
libinterp/corefcn/ls-mat-ascii.h, libinterp/corefcn/ls-mat4.cc,
libinterp/corefcn/ls-mat5.cc, libinterp/corefcn/ls-mat5.h,
libinterp/corefcn/ls-oct-ascii.cc, libinterp/corefcn/lsode.cc,
libinterp/corefcn/lu.cc, libinterp/corefcn/luinc.cc,
libinterp/corefcn/mappers.cc, libinterp/corefcn/matrix_type.cc,
libinterp/corefcn/max.cc, libinterp/corefcn/md5sum.cc,
libinterp/corefcn/mex.cc, libinterp/corefcn/mexproto.h,
libinterp/corefcn/mgorth.cc, libinterp/corefcn/mxarray.in.h,
libinterp/corefcn/nproc.cc, libinterp/corefcn/oct-hist.cc,
libinterp/corefcn/oct-lvalue.h, libinterp/corefcn/oct-map.cc,
libinterp/corefcn/oct-map.h, libinterp/corefcn/oct-obj.h,
libinterp/corefcn/oct-prcstrm.h, libinterp/corefcn/oct-stdstrm.h,
libinterp/corefcn/oct-stream.cc, libinterp/corefcn/oct-stream.h,
libinterp/corefcn/octave-link.cc, libinterp/corefcn/octave-link.h,
libinterp/corefcn/pager.cc, libinterp/corefcn/pinv.cc,
libinterp/corefcn/pr-output.cc, libinterp/corefcn/procstream.h,
libinterp/corefcn/profiler.cc, libinterp/corefcn/pt-jit.cc,
libinterp/corefcn/pt-jit.h, libinterp/corefcn/quad.cc,
libinterp/corefcn/quadcc.cc, libinterp/corefcn/qz.cc,
libinterp/corefcn/rand.cc, libinterp/corefcn/rcond.cc,
libinterp/corefcn/regexp.cc, libinterp/corefcn/schur.cc,
libinterp/corefcn/sighandlers.cc, libinterp/corefcn/sighandlers.h,
libinterp/corefcn/sparse-xdiv.cc, libinterp/corefcn/sparse-xdiv.h,
libinterp/corefcn/sparse-xpow.cc, libinterp/corefcn/sparse.cc,
libinterp/corefcn/spparms.cc, libinterp/corefcn/sqrtm.cc,
libinterp/corefcn/str2double.cc, libinterp/corefcn/strfind.cc,
libinterp/corefcn/strfns.cc, libinterp/corefcn/sub2ind.cc,
libinterp/corefcn/svd.cc, libinterp/corefcn/syl.cc,
libinterp/corefcn/symtab.cc, libinterp/corefcn/symtab.h,
libinterp/corefcn/syscalls.cc, libinterp/corefcn/sysdep.cc,
libinterp/corefcn/sysdep.h, libinterp/corefcn/time.cc,
libinterp/corefcn/toplev.cc, libinterp/corefcn/toplev.h,
libinterp/corefcn/tril.cc, libinterp/corefcn/txt-eng-ft.cc,
libinterp/corefcn/txt-eng-ft.h, libinterp/corefcn/txt-eng.h,
libinterp/corefcn/typecast.cc, libinterp/corefcn/urlwrite.cc,
libinterp/corefcn/utils.cc, libinterp/corefcn/variables.cc,
libinterp/corefcn/variables.h, libinterp/corefcn/xdiv.cc,
libinterp/corefcn/xdiv.h, libinterp/corefcn/xnorm.h, libinterp/corefcn/xpow.cc,
libinterp/corefcn/xpow.h, libinterp/corefcn/zfstream.cc,
libinterp/corefcn/zfstream.h, libinterp/dldfcn/__delaunayn__.cc,
libinterp/dldfcn/__dsearchn__.cc, libinterp/dldfcn/__eigs__.cc,
libinterp/dldfcn/__fltk_uigetfile__.cc, libinterp/dldfcn/__glpk__.cc,
libinterp/dldfcn/__init_fltk__.cc, libinterp/dldfcn/__init_gnuplot__.cc,
libinterp/dldfcn/__magick_read__.cc, libinterp/dldfcn/__voronoi__.cc,
libinterp/dldfcn/amd.cc, libinterp/dldfcn/ccolamd.cc, libinterp/dldfcn/chol.cc,
libinterp/dldfcn/colamd.cc, libinterp/dldfcn/convhulln.cc,
libinterp/dldfcn/dmperm.cc, libinterp/dldfcn/fftw.cc, libinterp/dldfcn/qr.cc,
libinterp/dldfcn/symbfact.cc, libinterp/dldfcn/symrcm.cc,
libinterp/dldfcn/tsearch.cc, libinterp/octave-value/ov-base-diag.cc,
libinterp/octave-value/ov-base-diag.h, libinterp/octave-value/ov-base-int.cc,
libinterp/octave-value/ov-base-int.h, libinterp/octave-value/ov-base-mat.h,
libinterp/octave-value/ov-base-scalar.cc,
libinterp/octave-value/ov-base-scalar.h,
libinterp/octave-value/ov-base-sparse.cc,
libinterp/octave-value/ov-base-sparse.h, libinterp/octave-value/ov-base.cc,
libinterp/octave-value/ov-base.h, libinterp/octave-value/ov-bool-mat.cc,
libinterp/octave-value/ov-bool-mat.h, libinterp/octave-value/ov-bool-sparse.cc,
libinterp/octave-value/ov-bool-sparse.h, libinterp/octave-value/ov-bool.cc,
libinterp/octave-value/ov-bool.h, libinterp/octave-value/ov-builtin.cc,
libinterp/octave-value/ov-builtin.h, libinterp/octave-value/ov-cell.cc,
libinterp/octave-value/ov-cell.h, libinterp/octave-value/ov-ch-mat.cc,
libinterp/octave-value/ov-ch-mat.h, libinterp/octave-value/ov-class.cc,
libinterp/octave-value/ov-class.h, libinterp/octave-value/ov-colon.h,
libinterp/octave-value/ov-complex.cc, libinterp/octave-value/ov-complex.h,
libinterp/octave-value/ov-cx-diag.cc, libinterp/octave-value/ov-cx-diag.h,
libinterp/octave-value/ov-cx-mat.cc, libinterp/octave-value/ov-cx-mat.h,
libinterp/octave-value/ov-cx-sparse.cc, libinterp/octave-value/ov-cx-sparse.h,
libinterp/octave-value/ov-dld-fcn.h, libinterp/octave-value/ov-fcn-handle.cc,
libinterp/octave-value/ov-fcn-handle.h,
libinterp/octave-value/ov-fcn-inline.cc,
libinterp/octave-value/ov-fcn-inline.h, libinterp/octave-value/ov-fcn.h,
libinterp/octave-value/ov-float.cc, libinterp/octave-value/ov-float.h,
libinterp/octave-value/ov-flt-complex.cc,
libinterp/octave-value/ov-flt-complex.h,
libinterp/octave-value/ov-flt-cx-diag.cc,
libinterp/octave-value/ov-flt-cx-diag.h,
libinterp/octave-value/ov-flt-cx-mat.cc,
libinterp/octave-value/ov-flt-cx-mat.h,
libinterp/octave-value/ov-flt-re-diag.cc,
libinterp/octave-value/ov-flt-re-diag.h,
libinterp/octave-value/ov-flt-re-mat.cc,
libinterp/octave-value/ov-flt-re-mat.h, libinterp/octave-value/ov-int16.cc,
libinterp/octave-value/ov-int32.cc, libinterp/octave-value/ov-int64.cc,
libinterp/octave-value/ov-int8.cc, libinterp/octave-value/ov-intx.h,
libinterp/octave-value/ov-java.cc, libinterp/octave-value/ov-lazy-idx.h,
libinterp/octave-value/ov-mex-fcn.cc, libinterp/octave-value/ov-mex-fcn.h,
libinterp/octave-value/ov-null-mat.cc, libinterp/octave-value/ov-null-mat.h,
libinterp/octave-value/ov-oncleanup.cc, libinterp/octave-value/ov-perm.cc,
libinterp/octave-value/ov-perm.h, libinterp/octave-value/ov-range.cc,
libinterp/octave-value/ov-range.h, libinterp/octave-value/ov-re-diag.cc,
libinterp/octave-value/ov-re-diag.h, libinterp/octave-value/ov-re-mat.cc,
libinterp/octave-value/ov-re-mat.h, libinterp/octave-value/ov-re-sparse.cc,
libinterp/octave-value/ov-re-sparse.h, libinterp/octave-value/ov-scalar.cc,
libinterp/octave-value/ov-scalar.h, libinterp/octave-value/ov-str-mat.cc,
libinterp/octave-value/ov-str-mat.h, libinterp/octave-value/ov-struct.cc,
libinterp/octave-value/ov-struct.h, libinterp/octave-value/ov-type-conv.h,
libinterp/octave-value/ov-typeinfo.cc, libinterp/octave-value/ov-typeinfo.h,
libinterp/octave-value/ov-uint16.cc, libinterp/octave-value/ov-uint32.cc,
libinterp/octave-value/ov-uint64.cc, libinterp/octave-value/ov-uint8.cc,
libinterp/octave-value/ov-usr-fcn.cc, libinterp/octave-value/ov-usr-fcn.h,
libinterp/octave-value/ov.cc, libinterp/octave-value/ov.h, libinterp/octave.cc,
libinterp/operators/op-b-bm.cc, libinterp/operators/op-b-sbm.cc,
libinterp/operators/op-bm-b.cc, libinterp/operators/op-bm-bm.cc,
libinterp/operators/op-cdm-cdm.cc, libinterp/operators/op-chm.cc,
libinterp/operators/op-class.cc, libinterp/operators/op-cm-cm.cc,
libinterp/operators/op-cm-cs.cc, libinterp/operators/op-cm-s.cc,
libinterp/operators/op-cm-scm.cc, libinterp/operators/op-cm-sm.cc,
libinterp/operators/op-cs-cm.cc, libinterp/operators/op-cs-cs.cc,
libinterp/operators/op-cs-scm.cc, libinterp/operators/op-cs-sm.cc,
libinterp/operators/op-dm-dm.cc, libinterp/operators/op-dm-scm.cc,
libinterp/operators/op-double-conv.cc, libinterp/operators/op-fcdm-fcdm.cc,
libinterp/operators/op-fcm-fcm.cc, libinterp/operators/op-fcm-fcs.cc,
libinterp/operators/op-fcm-fm.cc, libinterp/operators/op-fcm-fs.cc,
libinterp/operators/op-fcs-fcm.cc, libinterp/operators/op-fcs-fcs.cc,
libinterp/operators/op-fcs-fm.cc, libinterp/operators/op-fcs-fs.cc,
libinterp/operators/op-fdm-fdm.cc, libinterp/operators/op-float-conv.cc,
libinterp/operators/op-fm-fcm.cc, libinterp/operators/op-fm-fcs.cc,
libinterp/operators/op-fm-fm.cc, libinterp/operators/op-fm-fs.cc,
libinterp/operators/op-fs-fcm.cc, libinterp/operators/op-fs-fcs.cc,
libinterp/operators/op-fs-fm.cc, libinterp/operators/op-fs-fs.cc,
libinterp/operators/op-m-cm.cc, libinterp/operators/op-m-cs.cc,
libinterp/operators/op-m-m.cc, libinterp/operators/op-m-s.cc,
libinterp/operators/op-m-scm.cc, libinterp/operators/op-m-sm.cc,
libinterp/operators/op-pm-scm.cc, libinterp/operators/op-range.cc,
libinterp/operators/op-s-cm.cc, libinterp/operators/op-s-cs.cc,
libinterp/operators/op-s-scm.cc, libinterp/operators/op-sbm-b.cc,
libinterp/operators/op-sbm-bm.cc, libinterp/operators/op-sbm-sbm.cc,
libinterp/operators/op-scm-cm.cc, libinterp/operators/op-scm-cs.cc,
libinterp/operators/op-scm-m.cc, libinterp/operators/op-scm-s.cc,
libinterp/operators/op-scm-scm.cc, libinterp/operators/op-scm-sm.cc,
libinterp/operators/op-sm-cm.cc, libinterp/operators/op-sm-m.cc,
libinterp/operators/op-sm-s.cc, libinterp/operators/op-sm-scm.cc,
libinterp/operators/op-sm-sm.cc, libinterp/operators/op-str-m.cc,
libinterp/operators/op-str-s.cc, libinterp/operators/op-str-str.cc,
libinterp/operators/ops.h, libinterp/parse-tree/lex.h,
libinterp/parse-tree/parse.h, libinterp/parse-tree/pt-arg-list.cc,
libinterp/parse-tree/pt-arg-list.h, libinterp/parse-tree/pt-assign.cc,
libinterp/parse-tree/pt-assign.h, libinterp/parse-tree/pt-binop.cc,
libinterp/parse-tree/pt-binop.h, libinterp/parse-tree/pt-bp.h,
libinterp/parse-tree/pt-cbinop.cc, libinterp/parse-tree/pt-check.cc,
libinterp/parse-tree/pt-colon.cc, libinterp/parse-tree/pt-colon.h,
libinterp/parse-tree/pt-const.cc, libinterp/parse-tree/pt-decl.cc,
libinterp/parse-tree/pt-decl.h, libinterp/parse-tree/pt-eval.cc,
libinterp/parse-tree/pt-except.h, libinterp/parse-tree/pt-exp.h,
libinterp/parse-tree/pt-fcn-handle.cc, libinterp/parse-tree/pt-id.cc,
libinterp/parse-tree/pt-id.h, libinterp/parse-tree/pt-idx.cc,
libinterp/parse-tree/pt-idx.h, libinterp/parse-tree/pt-loop.h,
libinterp/parse-tree/pt-mat.cc, libinterp/parse-tree/pt-misc.cc,
libinterp/parse-tree/pt-misc.h, libinterp/parse-tree/pt-pr-code.cc,
libinterp/parse-tree/pt-select.h, libinterp/parse-tree/pt-stmt.h,
libinterp/parse-tree/token.h, libinterp/version.cc:
Use GNU style coding conventions for code in libinterp/
author | Rik <rik@octave.org> |
---|---|
date | Mon, 28 Oct 2013 19:51:46 -0700 |
parents | d63878346099 |
children | 446c46af4b42 |
line wrap: on
line source
/* Copyright (C) 2005-2013 Ludwig Schwardt, Kevin Ruland This file is part of Octave. Octave is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. Octave is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Octave; see the file COPYING. If not, see <http://www.gnu.org/licenses/>. */ /* This file is adapted from the zlib 1.2.2 contrib/iostream3 code, written by Ludwig Schwardt <schwardt@sun.ac.za> original version by Kevin Ruland <kevin@rodin.wustl.edu> */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include <iostream> #include "zfstream.h" #ifdef HAVE_ZLIB #include <cstring> // for strcpy, strcat, strlen (mode strings) #include <cstdio> // for BUFSIZ // Internal buffer sizes (default and "unbuffered" versions) #define STASHED_CHARACTERS 16 #define BIGBUFSIZE (256 * 1024 + STASHED_CHARACTERS) #define SMALLBUFSIZE 1 /*****************************************************************************/ // Default constructor gzfilebuf::gzfilebuf () : file(0), io_mode(std::ios_base::openmode(0)), own_fd(false), buffer(0), buffer_size(BIGBUFSIZE), own_buffer(true) { // No buffers to start with this->disable_buffer (); } // Destructor gzfilebuf::~gzfilebuf () { // Sync output buffer and close only if responsible for file // (i.e. attached streams should be left open at this stage) this->sync (); if (own_fd) this->close (); // Make sure internal buffer is deallocated this->disable_buffer (); } // Set compression level and strategy int gzfilebuf::setcompression (int comp_level, int comp_strategy) { return gzsetparams (file, comp_level, comp_strategy); } // Open gzipped file gzfilebuf* gzfilebuf::open (const char *name, std::ios_base::openmode mode) { // Fail if file already open if (this->is_open ()) return 0; // Don't support simultaneous read/write access (yet) if ((mode & std::ios_base::in) && (mode & std::ios_base::out)) return 0; // Build mode string for gzopen and check it [27.8.1.3.2] char char_mode[6] = "\0\0\0\0\0"; if (! this->open_mode (mode, char_mode)) return 0; // Attempt to open file if ((file = gzopen (name, char_mode)) == 0) return 0; // On success, allocate internal buffer and set flags this->enable_buffer (); io_mode = mode; own_fd = true; return this; } // Attach to gzipped file gzfilebuf* gzfilebuf::attach (int fd, std::ios_base::openmode mode) { // Fail if file already open if (this->is_open ()) return 0; // Don't support simultaneous read/write access (yet) if ((mode & std::ios_base::in) && (mode & std::ios_base::out)) return 0; // Build mode string for gzdopen and check it [27.8.1.3.2] char char_mode[6] = "\0\0\0\0\0"; if (! this->open_mode (mode, char_mode)) return 0; // Attempt to attach to file if ((file = gzdopen (fd, char_mode)) == 0) return 0; // On success, allocate internal buffer and set flags this->enable_buffer (); io_mode = mode; own_fd = false; return this; } // Close gzipped file gzfilebuf* gzfilebuf::close () { // Fail immediately if no file is open if (! this->is_open ()) return 0; // Assume success gzfilebuf* retval = this; // Attempt to sync and close gzipped file if (this->sync () == -1) retval = 0; if (gzclose (file) < 0) retval = 0; // File is now gone anyway (postcondition [27.8.1.3.8]) file = 0; own_fd = false; // Destroy internal buffer if it exists this->disable_buffer (); return retval; } /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ // Convert int open mode to mode string bool gzfilebuf::open_mode (std::ios_base::openmode mode, char* c_mode) const { // FIXME: do we need testb? // bool testb = mode & std::ios_base::binary; bool testi = mode & std::ios_base::in; bool testo = mode & std::ios_base::out; bool testt = mode & std::ios_base::trunc; bool testa = mode & std::ios_base::app; // Check for valid flag combinations - see [27.8.1.3.2] (Table 92) // Original zfstream hardcoded the compression level to maximum here... // Double the time for less than 1% size improvement seems // excessive though - keeping it at the default level // To change back, just append "9" to the next three mode strings if (!testi && testo && !testt && !testa) strcpy (c_mode, "w"); if (!testi && testo && !testt && testa) strcpy (c_mode, "a"); if (!testi && testo && testt && !testa) strcpy (c_mode, "w"); if (testi && !testo && !testt && !testa) strcpy (c_mode, "r"); // No read/write mode yet // if (testi && testo && !testt && !testa) // strcpy(c_mode, "r+"); // if (testi && testo && testt && !testa) // strcpy(c_mode, "w+"); // Mode string should be empty for invalid combination of flags if (strlen (c_mode) == 0) return false; strcat (c_mode, "b"); return true; } // Determine number of characters in internal get buffer std::streamsize gzfilebuf::showmanyc () { // Calls to underflow will fail if file not opened for reading if (! this->is_open () || !(io_mode & std::ios_base::in)) return -1; // Make sure get area is in use if (this->gptr () && (this->gptr () < this->egptr ())) return std::streamsize (this->egptr () - this->gptr ()); else return 0; } // Puts back a character to the stream in two cases. Firstly, when there // is no putback position available, and secondly when the character putback // differs from the one in the file. We can only support the first case // with gzipped files. gzfilebuf::int_type gzfilebuf::pbackfail (gzfilebuf::int_type c) { if (this->is_open ()) { if (gzseek (file, this->gptr () - this->egptr () - 1, SEEK_CUR) < 0) return traits_type::eof (); // Invalidates contents of the buffer enable_buffer (); // Attempt to fill internal buffer from gzipped file // (buffer must be guaranteed to exist...) int bytes_read = gzread (file, buffer, buffer_size); // Indicates error or EOF if (bytes_read <= 0) { // Reset get area this->setg (buffer, buffer, buffer); return traits_type::eof (); } // Make all bytes read from file available as get area this->setg (buffer, buffer, buffer + bytes_read); // If next character in get area differs from putback character // flag a failure gzfilebuf::int_type ret = traits_type::to_int_type (*(this->gptr ())); if (ret != c) return traits_type::eof (); else return ret; } else return traits_type::eof (); } // Fill get area from gzipped file gzfilebuf::int_type gzfilebuf::underflow () { // If something is left in the get area by chance, return it // (this shouldn't normally happen, as underflow is only supposed // to be called when gptr >= egptr, but it serves as error check) if (this->gptr () && (this->gptr () < this->egptr ())) return traits_type::to_int_type (*(this->gptr ())); // If the file hasn't been opened for reading, produce error if (! this->is_open () || !(io_mode & std::ios_base::in)) return traits_type::eof (); // Copy the final characters to the front of the buffer int stash = 0; if (this->eback () && buffer && buffer_size > STASHED_CHARACTERS) { char_type *ptr1 = buffer; char_type *ptr2 = this->egptr () - STASHED_CHARACTERS + 1; if (ptr2 > this->eback ()) while (stash++ <= STASHED_CHARACTERS) *ptr1++ = *ptr2++; } // Attempt to fill internal buffer from gzipped file // (buffer must be guaranteed to exist...) int bytes_read = gzread (file, buffer + stash, buffer_size - stash); // Indicates error or EOF if (bytes_read <= 0) { // Reset get area this->setg (buffer, buffer, buffer); return traits_type::eof (); } // Make all bytes read from file plus the stash available as get area this->setg (buffer, buffer + stash, buffer + bytes_read + stash); // Return next character in get area return traits_type::to_int_type (*(this->gptr ())); } // Write put area to gzipped file gzfilebuf::int_type gzfilebuf::overflow (int_type c) { // Determine whether put area is in use if (this->pbase ()) { // Double-check pointer range if (this->pptr () > this->epptr () || this->pptr () < this->pbase ()) return traits_type::eof (); // Add extra character to buffer if not EOF if (! traits_type::eq_int_type (c, traits_type::eof ())) { *(this->pptr ()) = traits_type::to_char_type (c); this->pbump (1); } // Number of characters to write to file int bytes_to_write = this->pptr () - this->pbase (); // Overflow doesn't fail if nothing is to be written if (bytes_to_write > 0) { // If the file hasn't been opened for writing, produce error if (! this->is_open () || !(io_mode & std::ios_base::out)) return traits_type::eof (); // If gzipped file won't accept all bytes written to it, fail if (gzwrite (file, this->pbase (), bytes_to_write) != bytes_to_write) return traits_type::eof (); // Reset next pointer to point to pbase on success this->pbump (-bytes_to_write); } } // Write extra character to file if not EOF else if (! traits_type::eq_int_type (c, traits_type::eof ())) { // If the file hasn't been opened for writing, produce error if (! this->is_open () || !(io_mode & std::ios_base::out)) return traits_type::eof (); // Impromptu char buffer (allows "unbuffered" output) char_type last_char = traits_type::to_char_type (c); // If gzipped file won't accept this character, fail if (gzwrite (file, &last_char, 1) != 1) return traits_type::eof (); } // If you got here, you have succeeded (even if c was EOF) // The return value should therefore be non-EOF if (traits_type::eq_int_type (c, traits_type::eof ())) return traits_type::not_eof (c); else return c; } // Assign new buffer std::streambuf* gzfilebuf::setbuf (char_type* p, std::streamsize n) { // First make sure stuff is sync'ed, for safety if (this->sync () == -1) return 0; // If buffering is turned off on purpose via setbuf(0,0), still allocate one. // "Unbuffered" only really refers to put [27.8.1.4.10], while get needs at // least a buffer of size 1 (very inefficient though, therefore make it // bigger?). This follows from [27.5.2.4.3]/12 (gptr needs to point at // something, it seems). if (!p || !n) { // Replace existing buffer (if any) with small internal buffer this->disable_buffer (); buffer = 0; buffer_size = 0; own_buffer = true; this->enable_buffer (); } else { // Replace existing buffer (if any) with external buffer this->disable_buffer (); buffer = p; buffer_size = n; own_buffer = false; this->enable_buffer (); } return this; } // Write put area to gzipped file (i.e. ensures that put area is empty) int gzfilebuf::sync () { return traits_type::eq_int_type (this->overflow (), traits_type::eof ()) ? -1 : 0; } /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ // Allocate internal buffer void gzfilebuf::enable_buffer () { // If internal buffer required, allocate one if (own_buffer && !buffer) { // Check for buffered vs. "unbuffered" if (buffer_size > 0) { // Allocate internal buffer buffer = new char_type [buffer_size]; // Get area starts empty and will be expanded by underflow as needed this->setg (buffer, buffer, buffer); // Setup entire internal buffer as put area. // The one-past-end pointer actually points to the last element of // the buffer, so that overflow(c) can safely add the extra character // c to the sequence. These pointers remain in place for the // duration of the buffer this->setp (buffer, buffer + buffer_size - 1); } else { // Even in "unbuffered" case, (small?) get buffer is still required buffer_size = SMALLBUFSIZE; buffer = new char_type [buffer_size]; this->setg (buffer, buffer, buffer); // "Unbuffered" means no put buffer this->setp (0, 0); } } else { // If buffer already allocated, reset buffer pointers just to make sure no // stale chars are lying around this->setg (buffer, buffer, buffer); this->setp (buffer, buffer + buffer_size - 1); } } // Destroy internal buffer void gzfilebuf::disable_buffer () { // If internal buffer exists, deallocate it if (own_buffer && buffer) { // Preserve unbuffered status by zeroing size if (! this->pbase ()) buffer_size = 0; delete[] buffer; buffer = 0; this->setg (0, 0, 0); this->setp (0, 0); } else { // Reset buffer pointers to initial state if external buffer exists this->setg (buffer, buffer, buffer); if (buffer) this->setp (buffer, buffer + buffer_size - 1); else this->setp (0, 0); } } /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ // Seek functions gzfilebuf::pos_type gzfilebuf::seekoff (off_type off, std::ios_base::seekdir way, std::ios_base::openmode) { pos_type ret = pos_type (off_type (-1)); if (this->is_open ()) { off_type computed_off = off; if ((io_mode & std::ios_base::in) && way == std::ios_base::cur) computed_off += this->gptr () - this->egptr (); // Handle tellg/tellp as a special case up front, no need to seek // or invalidate get/put buffers if (off == 0 && way == std::ios_base::cur) return pos_type (gztell (file) + computed_off); if (way == std::ios_base::beg) ret = pos_type (gzseek (file, computed_off, SEEK_SET)); else if (way == std::ios_base::cur) ret = pos_type (gzseek (file, computed_off, SEEK_CUR)); else // Can't seek from end of a gzipped file, so this will give -1 ret = pos_type (gzseek (file, computed_off, SEEK_END)); if (io_mode & std::ios_base::in) // Invalidates contents of the buffer enable_buffer (); else // flush contents of buffer to file overflow (); } return ret; } gzfilebuf::pos_type gzfilebuf::seekpos (pos_type sp, std::ios_base::openmode) { pos_type ret = pos_type (off_type (-1)); if (this->is_open ()) { ret = pos_type (gzseek (file, sp, SEEK_SET)); if (io_mode & std::ios_base::in) // Invalidates contents of the buffer enable_buffer (); else // flush contents of buffer to file overflow (); } return ret; } /*****************************************************************************/ // Default constructor initializes stream buffer gzifstream::gzifstream () : std::istream (0), sb () { this->init (&sb); } // Initialize stream buffer and open file gzifstream::gzifstream (const char* name, std::ios_base::openmode mode) : std::istream (0), sb () { this->init (&sb); this->open (name, mode); } // Initialize stream buffer and attach to file gzifstream::gzifstream (int fd, std::ios_base::openmode mode) : std::istream (0), sb () { this->init (&sb); this->attach (fd, mode); } // Open file and go into fail() state if unsuccessful void gzifstream::open (const char* name, std::ios_base::openmode mode) { if (! sb.open (name, mode | std::ios_base::in)) this->setstate (std::ios_base::failbit); else this->clear (); } // Attach to file and go into fail() state if unsuccessful void gzifstream::attach (int fd, std::ios_base::openmode mode) { if (! sb.attach (fd, mode | std::ios_base::in)) this->setstate (std::ios_base::failbit); else this->clear (); } // Close file void gzifstream::close () { if (! sb.close ()) this->setstate (std::ios_base::failbit); } /*****************************************************************************/ // Default constructor initializes stream buffer gzofstream::gzofstream () : std::ostream (0), sb () { this->init (&sb); } // Initialize stream buffer and open file gzofstream::gzofstream (const char* name, std::ios_base::openmode mode) : std::ostream (0), sb () { this->init (&sb); this->open (name, mode); } // Initialize stream buffer and attach to file gzofstream::gzofstream (int fd, std::ios_base::openmode mode) : std::ostream (0), sb () { this->init (&sb); this->attach (fd, mode); } // Open file and go into fail() state if unsuccessful void gzofstream::open (const char* name, std::ios_base::openmode mode) { if (! sb.open (name, mode | std::ios_base::out)) this->setstate (std::ios_base::failbit); else this->clear (); } // Attach to file and go into fail() state if unsuccessful void gzofstream::attach (int fd, std::ios_base::openmode mode) { if (! sb.attach (fd, mode | std::ios_base::out)) this->setstate (std::ios_base::failbit); else this->clear (); } // Close file void gzofstream::close () { if (! sb.close ()) this->setstate (std::ios_base::failbit); } #endif // HAVE_ZLIB