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-rw-r--r--decoder/gzstream.cc182
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diff --git a/decoder/gzstream.cc b/decoder/gzstream.cc
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-// ============================================================================
-// gzstream, C++ iostream classes wrapping the zlib compression library.
-// Copyright (C) 2001 Deepak Bandyopadhyay, Lutz Kettner
-//
-// This library is free software; you can redistribute it and/or
-// modify it under the terms of the GNU Lesser General Public
-// License as published by the Free Software Foundation; either
-// version 2.1 of the License, or (at your option) any later version.
-//
-// This library 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
-// Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public
-// License along with this library; if not, write to the Free Software
-// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-// ============================================================================
-//
-// File : gzstream.C
-// Revision : $Revision: 1.7 $
-// Revision_date : $Date: 2003/01/08 14:41:27 $
-// Author(s) : Deepak Bandyopadhyay, Lutz Kettner
-//
-// Standard streambuf implementation following Nicolai Josuttis, "The
-// Standard C++ Library".
-// ============================================================================
-
-#include <gzstream.h>
-#include <iostream>
-#include <cstring> // for memcpy
-#include <stdexcept>
-
-#ifdef GZSTREAM_NAMESPACE
-namespace GZSTREAM_NAMESPACE {
-#endif
-
-// ----------------------------------------------------------------------------
-// Internal classes to implement gzstream. See header file for user classes.
-// ----------------------------------------------------------------------------
-
-// --------------------------------------
-// class gzstreambuf:
-// --------------------------------------
-
-gzstreambuf* gzstreambuf::open( const char* name, int open_mode) {
- if ( is_open())
- return (gzstreambuf*)0;
- mode = open_mode;
- // no append nor read/write mode
- if ((mode & std::ios::ate) || (mode & std::ios::app)
- || ((mode & std::ios::in) && (mode & std::ios::out)))
- return (gzstreambuf*)0;
- const int Nmode=10;
- char fmode[Nmode];
- char* fmodeptr = fmode;
- if ( mode & std::ios::in)
- *fmodeptr++ = 'r';
- else if ( mode & std::ios::out)
- *fmodeptr++ = 'w';
- *fmodeptr++ = 'b';
- while (fmodeptr<fmode+Nmode) // hopefully wil help valgrind
- *fmodeptr++ = '\0';
- file = gzopen( name, fmode);
- if (!file) handle_gzerror();
- if (file == 0)
- return (gzstreambuf*)0;
- opened = 1;
- return this;
-}
-
-gzstreambuf * gzstreambuf::close() {
- if ( is_open()) {
- sync();
- opened = 0;
- if ( gzclose( file) == Z_OK)
- return this;
- else
- handle_gzerror();
- }
- return (gzstreambuf*)0;
-}
-
-void gzstreambuf::handle_gzerror() {
- int errnum;
- const char *errmsg=gzerror(file,&errnum);
- if (errnum==Z_DATA_ERROR) errmsg="CRC error reading gzip";
- throw std::runtime_error(std::string("gzstreambuf error: ")+errmsg);
-}
-
-int gzstreambuf::underflow() { // used for input buffer only
- if ( gptr() && ( gptr() < egptr()))
- return * reinterpret_cast<unsigned char *>( gptr());
-
- if ( ! (mode & std::ios::in) || ! opened)
- return EOF;
- // Josuttis' implementation of inbuf
- int n_putback = gptr() - eback();
- if ( n_putback > 4)
- n_putback = 4;
- std::memcpy( buffer + (4 - n_putback), gptr() - n_putback, n_putback);
-
- int num = gzread( file, buffer+4, bufferSize-4);
- if (num <= 0) // ERROR or EOF
- {
- if (gzeof(file))
- return EOF;
- handle_gzerror();
- }
-
- // reset buffer pointers
- setg( buffer + (4 - n_putback), // beginning of putback area
- buffer + 4, // read position
- buffer + 4 + num); // end of buffer
-
- // return next character
- return * reinterpret_cast<unsigned char *>( gptr());
-}
-
-int gzstreambuf::flush_buffer() {
- // Separate the writing of the buffer from overflow() and
- // sync() operation.
- int w = pptr() - pbase();
- if ( gzwrite( file, pbase(), w) != w)
- handle_gzerror();
- pbump( -w);
- return w;
-}
-
-int gzstreambuf::overflow( int c) { // used for output buffer only
- if ( ! ( mode & std::ios::out) || ! opened)
- return EOF;
- if (c != EOF) {
- *pptr() = c;
- pbump(1);
- }
- if ( flush_buffer() == EOF)
- return EOF;
- return c;
-}
-
-int gzstreambuf::sync() {
- // Changed to use flush_buffer() instead of overflow( EOF)
- // which caused improper behavior with std::endl and flush(),
- // bug reported by Vincent Ricard.
- if ( pptr() && pptr() > pbase()) {
- if ( flush_buffer() == EOF)
- return -1;
- }
- return 0;
-}
-
-// --------------------------------------
-// class gzstreambase:
-// --------------------------------------
-
-gzstreambase::gzstreambase( const char* name, int mode) {
- init( &buf);
- open( name, mode);
-}
-
-gzstreambase::~gzstreambase() {
- buf.close();
-}
-
-void gzstreambase::open( const char* name, int open_mode) {
- if ( ! buf.open( name, open_mode))
- clear( rdstate() | std::ios::badbit);
-}
-
-void gzstreambase::close() {
- if ( buf.is_open())
- if ( ! buf.close())
- clear( rdstate() | std::ios::badbit);
-}
-
-#ifdef GZSTREAM_NAMESPACE
-} // namespace GZSTREAM_NAMESPACE
-#endif
-
-// ============================================================================
-// EOF //